drivers/scsi/hpsa.c

   1 /*
   2  *    Disk Array driver for HP Smart Array SAS controllers
   3  *    Copyright 2000, 2009 Hewlett-Packard Development Company, L.P.
   4  *
   5  *    This program is free software; you can redistribute it and/or modify
   6  *    it under the terms of the GNU General Public License as published by
   7  *    the Free Software Foundation; version 2 of the License.
   8  *
   9  *    This program is distributed in the hope that it will be useful,
  10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  12  *    NON INFRINGEMENT.  See the GNU General Public License for more details.
  13  *
  14  *    You should have received a copy of the GNU General Public License
  15  *    along with this program; if not, write to the Free Software
  16  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  *
  18  *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
  19  *
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/types.h>
  25 #include <linux/pci.h>
  26 #include <linux/pci-aspm.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/delay.h>
  30 #include <linux/fs.h>
  31 #include <linux/timer.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/init.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/compat.h>
  36 #include <linux/blktrace_api.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/io.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/completion.h>
  41 #include <linux/moduleparam.h>
  42 #include <scsi/scsi.h>
  43 #include <scsi/scsi_cmnd.h>
  44 #include <scsi/scsi_device.h>
  45 #include <scsi/scsi_host.h>
  46 #include <scsi/scsi_tcq.h>
  47 #include <linux/cciss_ioctl.h>
  48 #include <linux/string.h>
  49 #include <linux/bitmap.h>
  50 #include <asm/atomic.h>
  51 #include <linux/kthread.h>
  52 #include "hpsa_cmd.h"
  53 #include "hpsa.h"
  54
  55 /* HPSA_DRIVER_VERSION must be 3 byte values (0-255) separated by '.' */
  56 #define HPSA_DRIVER_VERSION "2.0.2-1"
  57 #define DRIVER_NAME "HP HPSA Driver (v " HPSA_DRIVER_VERSION ")"
  58
  59 /* How long to wait (in milliseconds) for board to go into simple mode */
  60 #define MAX_CONFIG_WAIT 30000
  61 #define MAX_IOCTL_CONFIG_WAIT 1000
  62
  63 /*define how many times we will try a command because of bus resets */
  64 #define MAX_CMD_RETRIES 3
  65
  66 /* Embedded module documentation macros - see modules.h */
  67 MODULE_AUTHOR("Hewlett-Packard Company");
  68 MODULE_DESCRIPTION("Driver for HP Smart Array Controller version " \
  69         HPSA_DRIVER_VERSION);
  70 MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
  71 MODULE_VERSION(HPSA_DRIVER_VERSION);
  72 MODULE_LICENSE("GPL");
  73
  74 static int hpsa_allow_any;
  75 module_param(hpsa_allow_any, int, S_IRUGO|S_IWUSR);
  76 MODULE_PARM_DESC(hpsa_allow_any,
  77                 "Allow hpsa driver to access unknown HP Smart Array hardware");
  78 static int hpsa_simple_mode;
  79 module_param(hpsa_simple_mode, int, S_IRUGO|S_IWUSR);
  80 MODULE_PARM_DESC(hpsa_simple_mode,
  81         "Use 'simple mode' rather than 'performant mode'");
  82
  83 /* define the PCI info for the cards we can control */
  84 static const struct pci_device_id hpsa_pci_device_id[] = {
  85         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3241},
  86         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3243},
  87         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3245},
  88         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3247},
  89         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3249},
  90         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324a},
  91         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324b},
  92         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3233},
  93         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3350},
  94         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3351},
  95         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3352},
  96         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3353},
  97         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3354},
  98         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3355},
  99         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x3356},
 100         {PCI_VENDOR_ID_HP,     PCI_ANY_ID,      PCI_ANY_ID, PCI_ANY_ID,
 101                 PCI_CLASS_STORAGE_RAID << 8, 0xffff << 8, 0},
 102         {0,}
 103 };
 104
 105 MODULE_DEVICE_TABLE(pci, hpsa_pci_device_id);
 106
 107 /*  board_id = Subsystem Device ID & Vendor ID
 108  *  product = Marketing Name for the board
 109  *  access = Address of the struct of function pointers
 110  */
 111 static struct board_type products[] = {
 112         {0x3241103C, "Smart Array P212", &SA5_access},
 113         {0x3243103C, "Smart Array P410", &SA5_access},
 114         {0x3245103C, "Smart Array P410i", &SA5_access},
 115         {0x3247103C, "Smart Array P411", &SA5_access},
 116         {0x3249103C, "Smart Array P812", &SA5_access},
 117         {0x324a103C, "Smart Array P712m", &SA5_access},
 118         {0x324b103C, "Smart Array P711m", &SA5_access},
 119         {0x3350103C, "Smart Array", &SA5_access},
 120         {0x3351103C, "Smart Array", &SA5_access},
 121         {0x3352103C, "Smart Array", &SA5_access},
 122         {0x3353103C, "Smart Array", &SA5_access},
 123         {0x3354103C, "Smart Array", &SA5_access},
 124         {0x3355103C, "Smart Array", &SA5_access},
 125         {0x3356103C, "Smart Array", &SA5_access},
 126         {0xFFFF103C, "Unknown Smart Array", &SA5_access},
 127 };
 128
 129 static int number_of_controllers;
 130
 131 static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id);
 132 static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id);
 133 static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg);
 134 static void start_io(struct ctlr_info *h);
 135
 136 #ifdef CONFIG_COMPAT
 137 static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void *arg);
 138 #endif
 139
 140 static void cmd_free(struct ctlr_info *h, struct CommandList *c);
 141 static void cmd_special_free(struct ctlr_info *h, struct CommandList *c);
 142 static struct CommandList *cmd_alloc(struct ctlr_info *h);
 143 static struct CommandList *cmd_special_alloc(struct ctlr_info *h);
 144 static void fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
 145         void *buff, size_t size, u8 page_code, unsigned char *scsi3addr,
 146         int cmd_type);
 147
 148 static int hpsa_scsi_queue_command(struct Scsi_Host *h, struct scsi_cmnd *cmd);
 149 static void hpsa_scan_start(struct Scsi_Host *);
 150 static int hpsa_scan_finished(struct Scsi_Host *sh,
 151         unsigned long elapsed_time);
 152 static int hpsa_change_queue_depth(struct scsi_device *sdev,
 153         int qdepth, int reason);
 154
 155 static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd);
 156 static int hpsa_slave_alloc(struct scsi_device *sdev);
 157 static void hpsa_slave_destroy(struct scsi_device *sdev);
 158
 159 static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno);
 160 static int check_for_unit_attention(struct ctlr_info *h,
 161         struct CommandList *c);
 162 static void check_ioctl_unit_attention(struct ctlr_info *h,
 163         struct CommandList *c);
 164 /* performant mode helper functions */
 165 static void calc_bucket_map(int *bucket, int num_buckets,
 166         int nsgs, int *bucket_map);
 167 static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h);
 168 static inline u32 next_command(struct ctlr_info *h);
 169 static int __devinit hpsa_find_cfg_addrs(struct pci_dev *pdev,
 170         void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
 171         u64 *cfg_offset);
 172 static int __devinit hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
 173         unsigned long *memory_bar);
 174 static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id);
 175 static int __devinit hpsa_wait_for_board_state(struct pci_dev *pdev,
 176         void __iomem *vaddr, int wait_for_ready);
 177 #define BOARD_NOT_READY 0
 178 #define BOARD_READY 1
 179
 180 static inline struct ctlr_info *sdev_to_hba(struct scsi_device *sdev)
 181 {
 182         unsigned long *priv = shost_priv(sdev->host);
 183         return (struct ctlr_info *) *priv;
 184 }
 185
 186 static inline struct ctlr_info *shost_to_hba(struct Scsi_Host *sh)
 187 {
 188         unsigned long *priv = shost_priv(sh);
 189         return (struct ctlr_info *) *priv;
 190 }
 191
 192 static int check_for_unit_attention(struct ctlr_info *h,
 193         struct CommandList *c)
 194 {
 195         if (c->err_info->SenseInfo[2] != UNIT_ATTENTION)
 196                 return 0;
 197
 198         switch (c->err_info->SenseInfo[12]) {
 199         case STATE_CHANGED:
 200                 dev_warn(&h->pdev->dev, "hpsa%d: a state change "
 201                         "detected, command retried\n", h->ctlr);
 202                 break;
 203         case LUN_FAILED:
 204                 dev_warn(&h->pdev->dev, "hpsa%d: LUN failure "
 205                         "detected, action required\n", h->ctlr);
 206                 break;
 207         case REPORT_LUNS_CHANGED:
 208                 dev_warn(&h->pdev->dev, "hpsa%d: report LUN data "
 209                         "changed, action required\n", h->ctlr);
 210         /*
 211          * Note: this REPORT_LUNS_CHANGED condition only occurs on the MSA2012.
 212          */
 213                 break;
 214         case POWER_OR_RESET:
 215                 dev_warn(&h->pdev->dev, "hpsa%d: a power on "
 216                         "or device reset detected\n", h->ctlr);
 217                 break;
 218         case UNIT_ATTENTION_CLEARED:
 219                 dev_warn(&h->pdev->dev, "hpsa%d: unit attention "
 220                     "cleared by another initiator\n", h->ctlr);
 221                 break;
 222         default:
 223                 dev_warn(&h->pdev->dev, "hpsa%d: unknown "
 224                         "unit attention detected\n", h->ctlr);
 225                 break;
 226         }
 227         return 1;
 228 }
 229
 230 static ssize_t host_store_rescan(struct device *dev,
 231                                  struct device_attribute *attr,
 232                                  const char *buf, size_t count)
 233 {
 234         struct ctlr_info *h;
 235         struct Scsi_Host *shost = class_to_shost(dev);
 236         h = shost_to_hba(shost);
 237         hpsa_scan_start(h->scsi_host);
 238         return count;
 239 }
 240
 241 static ssize_t host_show_firmware_revision(struct device *dev,
 242              struct device_attribute *attr, char *buf)
 243 {
 244         struct ctlr_info *h;
 245         struct Scsi_Host *shost = class_to_shost(dev);
 246         unsigned char *fwrev;
 247
 248         h = shost_to_hba(shost);
 249         if (!h->hba_inquiry_data)
 250                 return 0;
 251         fwrev = &h->hba_inquiry_data[32];
 252         return snprintf(buf, 20, "%c%c%c%c\n",
 253                 fwrev[0], fwrev[1], fwrev[2], fwrev[3]);
 254 }
 255
 256 static ssize_t host_show_commands_outstanding(struct device *dev,
 257              struct device_attribute *attr, char *buf)
 258 {
 259         struct Scsi_Host *shost = class_to_shost(dev);
 260         struct ctlr_info *h = shost_to_hba(shost);
 261
 262         return snprintf(buf, 20, "%d\n", h->commands_outstanding);
 263 }
 264
 265 static ssize_t host_show_transport_mode(struct device *dev,
 266         struct device_attribute *attr, char *buf)
 267 {
 268         struct ctlr_info *h;
 269         struct Scsi_Host *shost = class_to_shost(dev);
 270
 271         h = shost_to_hba(shost);
 272         return snprintf(buf, 20, "%s\n",
 273                 h->transMethod & CFGTBL_Trans_Performant ?
 274                         "performant" : "simple");
 275 }
 276
 277 /* List of controllers which cannot be hard reset on kexec with reset_devices */
 278 static u32 unresettable_controller[] = {
 279         0x324a103C, /* Smart Array P712m */
 280         0x324b103C, /* SmartArray P711m */
 281         0x3223103C, /* Smart Array P800 */
 282         0x3234103C, /* Smart Array P400 */
 283         0x3235103C, /* Smart Array P400i */
 284         0x3211103C, /* Smart Array E200i */
 285         0x3212103C, /* Smart Array E200 */
 286         0x3213103C, /* Smart Array E200i */
 287         0x3214103C, /* Smart Array E200i */
 288         0x3215103C, /* Smart Array E200i */
 289         0x3237103C, /* Smart Array E500 */
 290         0x323D103C, /* Smart Array P700m */
 291         0x409C0E11, /* Smart Array 6400 */
 292         0x409D0E11, /* Smart Array 6400 EM */
 293 };
 294
 295 /* List of controllers which cannot even be soft reset */
 296 static u32 soft_unresettable_controller[] = {
 297         /* Exclude 640x boards.  These are two pci devices in one slot
 298          * which share a battery backed cache module.  One controls the
 299          * cache, the other accesses the cache through the one that controls
 300          * it.  If we reset the one controlling the cache, the other will
 301          * likely not be happy.  Just forbid resetting this conjoined mess.
 302          * The 640x isn't really supported by hpsa anyway.
 303          */
 304         0x409C0E11, /* Smart Array 6400 */
 305         0x409D0E11, /* Smart Array 6400 EM */
 306 };
 307
 308 static int ctlr_is_hard_resettable(u32 board_id)
 309 {
 310         int i;
 311
 312         for (i = 0; i < ARRAY_SIZE(unresettable_controller); i++)
 313                 if (unresettable_controller[i] == board_id)
 314                         return 0;
 315         return 1;
 316 }
 317
 318 static int ctlr_is_soft_resettable(u32 board_id)
 319 {
 320         int i;
 321
 322         for (i = 0; i < ARRAY_SIZE(soft_unresettable_controller); i++)
 323                 if (soft_unresettable_controller[i] == board_id)
 324                         return 0;
 325         return 1;
 326 }
 327
 328 static int ctlr_is_resettable(u32 board_id)
 329 {
 330         return ctlr_is_hard_resettable(board_id) ||
 331                 ctlr_is_soft_resettable(board_id);
 332 }
 333
 334 static ssize_t host_show_resettable(struct device *dev,
 335         struct device_attribute *attr, char *buf)
 336 {
 337         struct ctlr_info *h;
 338         struct Scsi_Host *shost = class_to_shost(dev);
 339
 340         h = shost_to_hba(shost);
 341         return snprintf(buf, 20, "%d\n", ctlr_is_resettable(h->board_id));
 342 }
 343
 344 static inline int is_logical_dev_addr_mode(unsigned char scsi3addr[])
 345 {
 346         return (scsi3addr[3] & 0xC0) == 0x40;
 347 }
 348
 349 static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
 350         "UNKNOWN"
 351 };
 352 #define RAID_UNKNOWN (ARRAY_SIZE(raid_label) - 1)
 353
 354 static ssize_t raid_level_show(struct device *dev,
 355              struct device_attribute *attr, char *buf)
 356 {
 357         ssize_t l = 0;
 358         unsigned char rlevel;
 359         struct ctlr_info *h;
 360         struct scsi_device *sdev;
 361         struct hpsa_scsi_dev_t *hdev;
 362         unsigned long flags;
 363
 364         sdev = to_scsi_device(dev);
 365         h = sdev_to_hba(sdev);
 366         spin_lock_irqsave(&h->lock, flags);
 367         hdev = sdev->hostdata;
 368         if (!hdev) {
 369                 spin_unlock_irqrestore(&h->lock, flags);
 370                 return -ENODEV;
 371         }
 372
 373         /* Is this even a logical drive? */
 374         if (!is_logical_dev_addr_mode(hdev->scsi3addr)) {
 375                 spin_unlock_irqrestore(&h->lock, flags);
 376                 l = snprintf(buf, PAGE_SIZE, "N/A\n");
 377                 return l;
 378         }
 379
 380         rlevel = hdev->raid_level;
 381         spin_unlock_irqrestore(&h->lock, flags);
 382         if (rlevel > RAID_UNKNOWN)
 383                 rlevel = RAID_UNKNOWN;
 384         l = snprintf(buf, PAGE_SIZE, "RAID %s\n", raid_label[rlevel]);
 385         return l;
 386 }
 387
 388 static ssize_t lunid_show(struct device *dev,
 389              struct device_attribute *attr, char *buf)
 390 {
 391         struct ctlr_info *h;
 392         struct scsi_device *sdev;
 393         struct hpsa_scsi_dev_t *hdev;
 394         unsigned long flags;
 395         unsigned char lunid[8];
 396
 397         sdev = to_scsi_device(dev);
 398         h = sdev_to_hba(sdev);
 399         spin_lock_irqsave(&h->lock, flags);
 400         hdev = sdev->hostdata;
 401         if (!hdev) {
 402                 spin_unlock_irqrestore(&h->lock, flags);
 403                 return -ENODEV;
 404         }
 405         memcpy(lunid, hdev->scsi3addr, sizeof(lunid));
 406         spin_unlock_irqrestore(&h->lock, flags);
 407         return snprintf(buf, 20, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 408                 lunid[0], lunid[1], lunid[2], lunid[3],
 409                 lunid[4], lunid[5], lunid[6], lunid[7]);
 410 }
 411
 412 static ssize_t unique_id_show(struct device *dev,
 413              struct device_attribute *attr, char *buf)
 414 {
 415         struct ctlr_info *h;
 416         struct scsi_device *sdev;
 417         struct hpsa_scsi_dev_t *hdev;
 418         unsigned long flags;
 419         unsigned char sn[16];
 420
 421         sdev = to_scsi_device(dev);
 422         h = sdev_to_hba(sdev);
 423         spin_lock_irqsave(&h->lock, flags);
 424         hdev = sdev->hostdata;
 425         if (!hdev) {
 426                 spin_unlock_irqrestore(&h->lock, flags);
 427                 return -ENODEV;
 428         }
 429         memcpy(sn, hdev->device_id, sizeof(sn));
 430         spin_unlock_irqrestore(&h->lock, flags);
 431         return snprintf(buf, 16 * 2 + 2,
 432                         "%02X%02X%02X%02X%02X%02X%02X%02X"
 433                         "%02X%02X%02X%02X%02X%02X%02X%02X\n",
 434                         sn[0], sn[1], sn[2], sn[3],
 435                         sn[4], sn[5], sn[6], sn[7],
 436                         sn[8], sn[9], sn[10], sn[11],
 437                         sn[12], sn[13], sn[14], sn[15]);
 438 }
 439
 440 static DEVICE_ATTR(raid_level, S_IRUGO, raid_level_show, NULL);
 441 static DEVICE_ATTR(lunid, S_IRUGO, lunid_show, NULL);
 442 static DEVICE_ATTR(unique_id, S_IRUGO, unique_id_show, NULL);
 443 static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
 444 static DEVICE_ATTR(firmware_revision, S_IRUGO,
 445         host_show_firmware_revision, NULL);
 446 static DEVICE_ATTR(commands_outstanding, S_IRUGO,
 447         host_show_commands_outstanding, NULL);
 448 static DEVICE_ATTR(transport_mode, S_IRUGO,
 449         host_show_transport_mode, NULL);
 450 static DEVICE_ATTR(resettable, S_IRUGO,
 451         host_show_resettable, NULL);
 452
 453 static struct device_attribute *hpsa_sdev_attrs[] = {
 454         &dev_attr_raid_level,
 455         &dev_attr_lunid,
 456         &dev_attr_unique_id,
 457         NULL,
 458 };
 459
 460 static struct device_attribute *hpsa_shost_attrs[] = {
 461         &dev_attr_rescan,
 462         &dev_attr_firmware_revision,
 463         &dev_attr_commands_outstanding,
 464         &dev_attr_transport_mode,
 465         &dev_attr_resettable,
 466         NULL,
 467 };
 468
 469 static struct scsi_host_template hpsa_driver_template = {
 470         .module                 = THIS_MODULE,
 471         .name                   = "hpsa",
 472         .proc_name              = "hpsa",
 473         .queuecommand           = hpsa_scsi_queue_command,
 474         .scan_start             = hpsa_scan_start,
 475         .scan_finished          = hpsa_scan_finished,
 476         .change_queue_depth     = hpsa_change_queue_depth,
 477         .this_id                = -1,
 478         .use_clustering         = ENABLE_CLUSTERING,
 479         .eh_device_reset_handler = hpsa_eh_device_reset_handler,
 480         .ioctl                  = hpsa_ioctl,
 481         .slave_alloc            = hpsa_slave_alloc,
 482         .slave_destroy          = hpsa_slave_destroy,
 483 #ifdef CONFIG_COMPAT
 484         .compat_ioctl           = hpsa_compat_ioctl,
 485 #endif
 486         .sdev_attrs = hpsa_sdev_attrs,
 487         .shost_attrs = hpsa_shost_attrs,
 488 };
 489
 490
 491 /* Enqueuing and dequeuing functions for cmdlists. */
 492 static inline void addQ(struct list_head *list, struct CommandList *c)
 493 {
 494         list_add_tail(&c->list, list);
 495 }
 496
 497 static inline u32 next_command(struct ctlr_info *h)
 498 {
 499         u32 a;
 500
 501         if (unlikely(!(h->transMethod & CFGTBL_Trans_Performant)))
 502                 return h->access.command_completed(h);
 503
 504         if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
 505                 a = *(h->reply_pool_head); /* Next cmd in ring buffer */
 506                 (h->reply_pool_head)++;
 507                 h->commands_outstanding--;
 508         } else {
 509                 a = FIFO_EMPTY;
 510         }
 511         /* Check for wraparound */
 512         if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
 513                 h->reply_pool_head = h->reply_pool;
 514                 h->reply_pool_wraparound ^= 1;
 515         }
 516         return a;
 517 }
 518
 519 /* set_performant_mode: Modify the tag for cciss performant
 520  * set bit 0 for pull model, bits 3-1 for block fetch
 521  * register number
 522  */
 523 static void set_performant_mode(struct ctlr_info *h, struct CommandList *c)
 524 {
 525         if (likely(h->transMethod & CFGTBL_Trans_Performant))
 526                 c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
 527 }
 528
 529 static void enqueue_cmd_and_start_io(struct ctlr_info *h,
 530         struct CommandList *c)
 531 {
 532         unsigned long flags;
 533
 534         set_performant_mode(h, c);
 535         spin_lock_irqsave(&h->lock, flags);
 536         addQ(&h->reqQ, c);
 537         h->Qdepth++;
 538         start_io(h);
 539         spin_unlock_irqrestore(&h->lock, flags);
 540 }
 541
 542 static inline void removeQ(struct CommandList *c)
 543 {
 544         if (WARN_ON(list_empty(&c->list)))
 545                 return;
 546         list_del_init(&c->list);
 547 }
 548
 549 static inline int is_hba_lunid(unsigned char scsi3addr[])
 550 {
 551         return memcmp(scsi3addr, RAID_CTLR_LUNID, 8) == 0;
 552 }
 553
 554 static inline int is_scsi_rev_5(struct ctlr_info *h)
 555 {
 556         if (!h->hba_inquiry_data)
 557                 return 0;
 558         if ((h->hba_inquiry_data[2] & 0x07) == 5)
 559                 return 1;
 560         return 0;
 561 }
 562
 563 static int hpsa_find_target_lun(struct ctlr_info *h,
 564         unsigned char scsi3addr[], int bus, int *target, int *lun)
 565 {
 566         /* finds an unused bus, target, lun for a new physical device
 567          * assumes h->devlock is held
 568          */
 569         int i, found = 0;
 570         DECLARE_BITMAP(lun_taken, HPSA_MAX_SCSI_DEVS_PER_HBA);
 571
 572         memset(&lun_taken[0], 0, HPSA_MAX_SCSI_DEVS_PER_HBA >> 3);
 573
 574         for (i = 0; i < h->ndevices; i++) {
 575                 if (h->dev[i]->bus == bus && h->dev[i]->target != -1)
 576                         set_bit(h->dev[i]->target, lun_taken);
 577         }
 578
 579         for (i = 0; i < HPSA_MAX_SCSI_DEVS_PER_HBA; i++) {
 580                 if (!test_bit(i, lun_taken)) {
 581                         /* *bus = 1; */
 582                         *target = i;
 583                         *lun = 0;
 584                         found = 1;
 585                         break;
 586                 }
 587         }
 588         return !found;
 589 }
 590
 591 /* Add an entry into h->dev[] array. */
 592 static int hpsa_scsi_add_entry(struct ctlr_info *h, int hostno,
 593                 struct hpsa_scsi_dev_t *device,
 594                 struct hpsa_scsi_dev_t *added[], int *nadded)
 595 {
 596         /* assumes h->devlock is held */
 597         int n = h->ndevices;
 598         int i;
 599         unsigned char addr1[8], addr2[8];
 600         struct hpsa_scsi_dev_t *sd;
 601
 602         if (n >= HPSA_MAX_SCSI_DEVS_PER_HBA) {
 603                 dev_err(&h->pdev->dev, "too many devices, some will be "
 604                         "inaccessible.\n");
 605                 return -1;
 606         }
 607
 608         /* physical devices do not have lun or target assigned until now. */
 609         if (device->lun != -1)
 610                 /* Logical device, lun is already assigned. */
 611                 goto lun_assigned;
 612
 613         /* If this device a non-zero lun of a multi-lun device
 614          * byte 4 of the 8-byte LUN addr will contain the logical
 615          * unit no, zero otherise.
 616          */
 617         if (device->scsi3addr[4] == 0) {
 618                 /* This is not a non-zero lun of a multi-lun device */
 619                 if (hpsa_find_target_lun(h, device->scsi3addr,
 620                         device->bus, &device->target, &device->lun) != 0)
 621                         return -1;
 622                 goto lun_assigned;
 623         }
 624
 625         /* This is a non-zero lun of a multi-lun device.
 626          * Search through our list and find the device which
 627          * has the same 8 byte LUN address, excepting byte 4.
 628          * Assign the same bus and target for this new LUN.
 629          * Use the logical unit number from the firmware.
 630          */
 631         memcpy(addr1, device->scsi3addr, 8);
 632         addr1[4] = 0;
 633         for (i = 0; i < n; i++) {
 634                 sd = h->dev[i];
 635                 memcpy(addr2, sd->scsi3addr, 8);
 636                 addr2[4] = 0;
 637                 /* differ only in byte 4? */
 638                 if (memcmp(addr1, addr2, 8) == 0) {
 639                         device->bus = sd->bus;
 640                         device->target = sd->target;
 641                         device->lun = device->scsi3addr[4];
 642                         break;
 643                 }
 644         }
 645         if (device->lun == -1) {
 646                 dev_warn(&h->pdev->dev, "physical device with no LUN=0,"
 647                         " suspect firmware bug or unsupported hardware "
 648                         "configuration.\n");
 649                         return -1;
 650         }
 651
 652 lun_assigned:
 653
 654         h->dev[n] = device;
 655         h->ndevices++;
 656         added[*nadded] = device;
 657         (*nadded)++;
 658
 659         /* initially, (before registering with scsi layer) we don't
 660          * know our hostno and we don't want to print anything first
 661          * time anyway (the scsi layer's inquiries will show that info)
 662          */
 663         /* if (hostno != -1) */
 664                 dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.\n",
 665                         scsi_device_type(device->devtype), hostno,
 666                         device->bus, device->target, device->lun);
 667         return 0;
 668 }
 669
 670 /* Replace an entry from h->dev[] array. */
 671 static void hpsa_scsi_replace_entry(struct ctlr_info *h, int hostno,
 672         int entry, struct hpsa_scsi_dev_t *new_entry,
 673         struct hpsa_scsi_dev_t *added[], int *nadded,
 674         struct hpsa_scsi_dev_t *removed[], int *nremoved)
 675 {
 676         /* assumes h->devlock is held */
 677         BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);
 678         removed[*nremoved] = h->dev[entry];
 679         (*nremoved)++;
 680
 681         /*
 682          * New physical devices won't have target/lun assigned yet
 683          * so we need to preserve the values in the slot we are replacing.
 684          */
 685         if (new_entry->target == -1) {
 686                 new_entry->target = h->dev[entry]->target;
 687                 new_entry->lun = h->dev[entry]->lun;
 688         }
 689
 690         h->dev[entry] = new_entry;
 691         added[*nadded] = new_entry;
 692         (*nadded)++;
 693         dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d changed.\n",
 694                 scsi_device_type(new_entry->devtype), hostno, new_entry->bus,
 695                         new_entry->target, new_entry->lun);
 696 }
 697
 698 /* Remove an entry from h->dev[] array. */
 699 static void hpsa_scsi_remove_entry(struct ctlr_info *h, int hostno, int entry,
 700         struct hpsa_scsi_dev_t *removed[], int *nremoved)
 701 {
 702         /* assumes h->devlock is held */
 703         int i;
 704         struct hpsa_scsi_dev_t *sd;
 705
 706         BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);
 707
 708         sd = h->dev[entry];
 709         removed[*nremoved] = h->dev[entry];
 710         (*nremoved)++;
 711
 712         for (i = entry; i < h->ndevices-1; i++)
 713                 h->dev[i] = h->dev[i+1];
 714         h->ndevices--;
 715         dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.\n",
 716                 scsi_device_type(sd->devtype), hostno, sd->bus, sd->target,
 717                 sd->lun);
 718 }
 719
 720 #define SCSI3ADDR_EQ(a, b) ( \
 721         (a)[7] == (b)[7] && \
 722         (a)[6] == (b)[6] && \
 723         (a)[5] == (b)[5] && \
 724         (a)[4] == (b)[4] && \
 725         (a)[3] == (b)[3] && \
 726         (a)[2] == (b)[2] && \
 727         (a)[1] == (b)[1] && \
 728         (a)[0] == (b)[0])
 729
 730 static void fixup_botched_add(struct ctlr_info *h,
 731         struct hpsa_scsi_dev_t *added)
 732 {
 733         /* called when scsi_add_device fails in order to re-adjust
 734          * h->dev[] to match the mid layer's view.
 735          */
 736         unsigned long flags;
 737         int i, j;
 738
 739         spin_lock_irqsave(&h->lock, flags);
 740         for (i = 0; i < h->ndevices; i++) {
 741                 if (h->dev[i] == added) {
 742                         for (j = i; j < h->ndevices-1; j++)
 743                                 h->dev[j] = h->dev[j+1];
 744                         h->ndevices--;
 745                         break;
 746                 }
 747         }
 748         spin_unlock_irqrestore(&h->lock, flags);
 749         kfree(added);
 750 }
 751
 752 static inline int device_is_the_same(struct hpsa_scsi_dev_t *dev1,
 753         struct hpsa_scsi_dev_t *dev2)
 754 {
 755         /* we compare everything except lun and target as these
 756          * are not yet assigned.  Compare parts likely
 757          * to differ first
 758          */
 759         if (memcmp(dev1->scsi3addr, dev2->scsi3addr,
 760                 sizeof(dev1->scsi3addr)) != 0)
 761                 return 0;
 762         if (memcmp(dev1->device_id, dev2->device_id,
 763                 sizeof(dev1->device_id)) != 0)
 764                 return 0;
 765         if (memcmp(dev1->model, dev2->model, sizeof(dev1->model)) != 0)
 766                 return 0;
 767         if (memcmp(dev1->vendor, dev2->vendor, sizeof(dev1->vendor)) != 0)
 768                 return 0;
 769         if (dev1->devtype != dev2->devtype)
 770                 return 0;
 771         if (dev1->bus != dev2->bus)
 772                 return 0;
 773         return 1;
 774 }
 775
 776 /* Find needle in haystack.  If exact match found, return DEVICE_SAME,
 777  * and return needle location in *index.  If scsi3addr matches, but not
 778  * vendor, model, serial num, etc. return DEVICE_CHANGED, and return needle
 779  * location in *index.  If needle not found, return DEVICE_NOT_FOUND.
 780  */
 781 static int hpsa_scsi_find_entry(struct hpsa_scsi_dev_t *needle,
 782         struct hpsa_scsi_dev_t *haystack[], int haystack_size,
 783         int *index)
 784 {
 785         int i;
 786 #define DEVICE_NOT_FOUND 0
 787 #define DEVICE_CHANGED 1
 788 #define DEVICE_SAME 2
 789         for (i = 0; i < haystack_size; i++) {
 790                 if (haystack[i] == NULL) /* previously removed. */
 791                         continue;
 792                 if (SCSI3ADDR_EQ(needle->scsi3addr, haystack[i]->scsi3addr)) {
 793                         *index = i;
 794                         if (device_is_the_same(needle, haystack[i]))
 795                                 return DEVICE_SAME;
 796                         else
 797                                 return DEVICE_CHANGED;
 798                 }
 799         }
 800         *index = -1;
 801         return DEVICE_NOT_FOUND;
 802 }
 803
 804 static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
 805         struct hpsa_scsi_dev_t *sd[], int nsds)
 806 {
 807         /* sd contains scsi3 addresses and devtypes, and inquiry
 808          * data.  This function takes what's in sd to be the current
 809          * reality and updates h->dev[] to reflect that reality.
 810          */
 811         int i, entry, device_change, changes = 0;
 812         struct hpsa_scsi_dev_t *csd;
 813         unsigned long flags;
 814         struct hpsa_scsi_dev_t **added, **removed;
 815         int nadded, nremoved;
 816         struct Scsi_Host *sh = NULL;
 817
 818         added = kzalloc(sizeof(*added) * HPSA_MAX_SCSI_DEVS_PER_HBA,
 819                 GFP_KERNEL);
 820         removed = kzalloc(sizeof(*removed) * HPSA_MAX_SCSI_DEVS_PER_HBA,
 821                 GFP_KERNEL);
 822
 823         if (!added || !removed) {
 824                 dev_warn(&h->pdev->dev, "out of memory in "
 825                         "adjust_hpsa_scsi_table\n");
 826                 goto free_and_out;
 827         }
 828
 829         spin_lock_irqsave(&h->devlock, flags);
 830
 831         /* find any devices in h->dev[] that are not in
 832          * sd[] and remove them from h->dev[], and for any
 833          * devices which have changed, remove the old device
 834          * info and add the new device info.
 835          */
 836         i = 0;
 837         nremoved = 0;
 838         nadded = 0;
 839         while (i < h->ndevices) {
 840                 csd = h->dev[i];
 841                 device_change = hpsa_scsi_find_entry(csd, sd, nsds, &entry);
 842                 if (device_change == DEVICE_NOT_FOUND) {
 843                         changes++;
 844                         hpsa_scsi_remove_entry(h, hostno, i,
 845                                 removed, &nremoved);
 846                         continue; /* remove ^^^, hence i not incremented */
 847                 } else if (device_change == DEVICE_CHANGED) {
 848                         changes++;
 849                         hpsa_scsi_replace_entry(h, hostno, i, sd[entry],
 850                                 added, &nadded, removed, &nremoved);
 851                         /* Set it to NULL to prevent it from being freed
 852                          * at the bottom of hpsa_update_scsi_devices()
 853                          */
 854                         sd[entry] = NULL;
 855                 }
 856                 i++;
 857         }
 858
 859         /* Now, make sure every device listed in sd[] is also
 860          * listed in h->dev[], adding them if they aren't found
 861          */
 862
 863         for (i = 0; i < nsds; i++) {
 864                 if (!sd[i]) /* if already added above. */
 865                         continue;
 866                 device_change = hpsa_scsi_find_entry(sd[i], h->dev,
 867                                         h->ndevices, &entry);
 868                 if (device_change == DEVICE_NOT_FOUND) {
 869                         changes++;
 870                         if (hpsa_scsi_add_entry(h, hostno, sd[i],
 871                                 added, &nadded) != 0)
 872                                 break;
 873                         sd[i] = NULL; /* prevent from being freed later. */
 874                 } else if (device_change == DEVICE_CHANGED) {
 875                         /* should never happen... */
 876                         changes++;
 877                         dev_warn(&h->pdev->dev,
 878                                 "device unexpectedly changed.\n");
 879                         /* but if it does happen, we just ignore that device */
 880                 }
 881         }
 882         spin_unlock_irqrestore(&h->devlock, flags);
 883
 884         /* Don't notify scsi mid layer of any changes the first time through
 885          * (or if there are no changes) scsi_scan_host will do it later the
 886          * first time through.
 887          */
 888         if (hostno == -1 || !changes)
 889                 goto free_and_out;
 890
 891         sh = h->scsi_host;
 892         /* Notify scsi mid layer of any removed devices */
 893         for (i = 0; i < nremoved; i++) {
 894                 struct scsi_device *sdev =
 895                         scsi_device_lookup(sh, removed[i]->bus,
 896                                 removed[i]->target, removed[i]->lun);
 897                 if (sdev != NULL) {
 898                         scsi_remove_device(sdev);
 899                         scsi_device_put(sdev);
 900                 } else {
 901                         /* We don't expect to get here.
 902                          * future cmds to this device will get selection
 903                          * timeout as if the device was gone.
 904                          */
 905                         dev_warn(&h->pdev->dev, "didn't find c%db%dt%dl%d "
 906                                 " for removal.", hostno, removed[i]->bus,
 907                                 removed[i]->target, removed[i]->lun);
 908                 }
 909                 kfree(removed[i]);
 910                 removed[i] = NULL;
 911         }
 912
 913         /* Notify scsi mid layer of any added devices */
 914         for (i = 0; i < nadded; i++) {
 915                 if (scsi_add_device(sh, added[i]->bus,
 916                         added[i]->target, added[i]->lun) == 0)
 917                         continue;
 918                 dev_warn(&h->pdev->dev, "scsi_add_device c%db%dt%dl%d failed, "
 919                         "device not added.\n", hostno, added[i]->bus,
 920                         added[i]->target, added[i]->lun);
 921                 /* now we have to remove it from h->dev,
 922                  * since it didn't get added to scsi mid layer
 923                  */
 924                 fixup_botched_add(h, added[i]);
 925         }
 926
 927 free_and_out:
 928         kfree(added);
 929         kfree(removed);
 930 }
 931
 932 /*
 933  * Lookup bus/target/lun and retrun corresponding struct hpsa_scsi_dev_t *
 934  * Assume's h->devlock is held.
 935  */
 936 static struct hpsa_scsi_dev_t *lookup_hpsa_scsi_dev(struct ctlr_info *h,
 937         int bus, int target, int lun)
 938 {
 939         int i;
 940         struct hpsa_scsi_dev_t *sd;
 941
 942         for (i = 0; i < h->ndevices; i++) {
 943                 sd = h->dev[i];
 944                 if (sd->bus == bus && sd->target == target && sd->lun == lun)
 945                         return sd;
 946         }
 947         return NULL;
 948 }
 949
 950 /* link sdev->hostdata to our per-device structure. */
 951 static int hpsa_slave_alloc(struct scsi_device *sdev)
 952 {
 953         struct hpsa_scsi_dev_t *sd;
 954         unsigned long flags;
 955         struct ctlr_info *h;
 956
 957         h = sdev_to_hba(sdev);
 958         spin_lock_irqsave(&h->devlock, flags);
 959         sd = lookup_hpsa_scsi_dev(h, sdev_channel(sdev),
 960                 sdev_id(sdev), sdev->lun);
 961         if (sd != NULL)
 962                 sdev->hostdata = sd;
 963         spin_unlock_irqrestore(&h->devlock, flags);
 964         return 0;
 965 }
 966
 967 static void hpsa_slave_destroy(struct scsi_device *sdev)
 968 {
 969         /* nothing to do. */
 970 }
 971
 972 static void hpsa_free_sg_chain_blocks(struct ctlr_info *h)
 973 {
 974         int i;
 975
 976         if (!h->cmd_sg_list)
 977                 return;
 978         for (i = 0; i < h->nr_cmds; i++) {
 979                 kfree(h->cmd_sg_list[i]);
 980                 h->cmd_sg_list[i] = NULL;
 981         }
 982         kfree(h->cmd_sg_list);
 983         h->cmd_sg_list = NULL;
 984 }
 985
 986 static int hpsa_allocate_sg_chain_blocks(struct ctlr_info *h)
 987 {
 988         int i;
 989
 990         if (h->chainsize <= 0)
 991                 return 0;
 992
 993         h->cmd_sg_list = kzalloc(sizeof(*h->cmd_sg_list) * h->nr_cmds,
 994                                 GFP_KERNEL);
 995         if (!h->cmd_sg_list)
 996                 return -ENOMEM;
 997         for (i = 0; i < h->nr_cmds; i++) {
 998                 h->cmd_sg_list[i] = kmalloc(sizeof(*h->cmd_sg_list[i]) *
 999                                                 h->chainsize, GFP_KERNEL);
1000                 if (!h->cmd_sg_list[i])
1001                         goto clean;
1002         }
1003         return 0;
1004
1005 clean:
1006         hpsa_free_sg_chain_blocks(h);
1007         return -ENOMEM;
1008 }
1009
1010 static void hpsa_map_sg_chain_block(struct ctlr_info *h,
1011         struct CommandList *c)
1012 {
1013         struct SGDescriptor *chain_sg, *chain_block;
1014         u64 temp64;
1015
1016         chain_sg = &c->SG[h->max_cmd_sg_entries - 1];
1017         chain_block = h->cmd_sg_list[c->cmdindex];
1018         chain_sg->Ext = HPSA_SG_CHAIN;
1019         chain_sg->Len = sizeof(*chain_sg) *
1020                 (c->Header.SGTotal - h->max_cmd_sg_entries);
1021         temp64 = pci_map_single(h->pdev, chain_block, chain_sg->Len,
1022                                 PCI_DMA_TODEVICE);
1023         chain_sg->Addr.lower = (u32) (temp64 & 0x0FFFFFFFFULL);
1024         chain_sg->Addr.upper = (u32) ((temp64 >> 32) & 0x0FFFFFFFFULL);
1025 }
1026
1027 static void hpsa_unmap_sg_chain_block(struct ctlr_info *h,
1028         struct CommandList *c)
1029 {
1030         struct SGDescriptor *chain_sg;
1031         union u64bit temp64;
1032
1033         if (c->Header.SGTotal <= h->max_cmd_sg_entries)
1034                 return;
1035
1036         chain_sg = &c->SG[h->max_cmd_sg_entries - 1];
1037         temp64.val32.lower = chain_sg->Addr.lower;
1038         temp64.val32.upper = chain_sg->Addr.upper;
1039         pci_unmap_single(h->pdev, temp64.val, chain_sg->Len, PCI_DMA_TODEVICE);
1040 }
1041
1042 static void complete_scsi_command(struct CommandList *cp)
1043 {
1044         struct scsi_cmnd *cmd;
1045         struct ctlr_info *h;
1046         struct ErrorInfo *ei;
1047
1048         unsigned char sense_key;
1049         unsigned char asc;      /* additional sense code */
1050         unsigned char ascq;     /* additional sense code qualifier */
1051         unsigned long sense_data_size;
1052
1053         ei = cp->err_info;
1054         cmd = (struct scsi_cmnd *) cp->scsi_cmd;
1055         h = cp->h;
1056
1057         scsi_dma_unmap(cmd); /* undo the DMA mappings */
1058         if (cp->Header.SGTotal > h->max_cmd_sg_entries)
1059                 hpsa_unmap_sg_chain_block(h, cp);
1060
1061         cmd->result = (DID_OK << 16);           /* host byte */
1062         cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
1063         cmd->result |= ei->ScsiStatus;
1064
1065         /* copy the sense data whether we need to or not. */
1066         if (SCSI_SENSE_BUFFERSIZE < sizeof(ei->SenseInfo))
1067                 sense_data_size = SCSI_SENSE_BUFFERSIZE;
1068         else
1069                 sense_data_size = sizeof(ei->SenseInfo);
1070         if (ei->SenseLen < sense_data_size)
1071                 sense_data_size = ei->SenseLen;
1072
1073         memcpy(cmd->sense_buffer, ei->SenseInfo, sense_data_size);
1074         scsi_set_resid(cmd, ei->ResidualCnt);
1075
1076         if (ei->CommandStatus == 0) {
1077                 cmd->scsi_done(cmd);
1078                 cmd_free(h, cp);
1079                 return;
1080         }
1081
1082         /* an error has occurred */
1083         switch (ei->CommandStatus) {
1084
1085         case CMD_TARGET_STATUS:
1086                 if (ei->ScsiStatus) {
1087                         /* Get sense key */
1088                         sense_key = 0xf & ei->SenseInfo[2];
1089                         /* Get additional sense code */
1090                         asc = ei->SenseInfo[12];
1091                         /* Get addition sense code qualifier */
1092                         ascq = ei->SenseInfo[13];
1093                 }
1094
1095                 if (ei->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
1096                         if (check_for_unit_attention(h, cp)) {
1097                                 cmd->result = DID_SOFT_ERROR << 16;
1098                                 break;
1099                         }
1100                         if (sense_key == ILLEGAL_REQUEST) {
1101                                 /*
1102                                  * SCSI REPORT_LUNS is commonly unsupported on
1103                                  * Smart Array.  Suppress noisy complaint.
1104                                  */
1105                                 if (cp->Request.CDB[0] == REPORT_LUNS)
1106                                         break;
1107
1108                                 /* If ASC/ASCQ indicate Logical Unit
1109                                  * Not Supported condition,
1110                                  */
1111                                 if ((asc == 0x25) && (ascq == 0x0)) {
1112                                         dev_warn(&h->pdev->dev, "cp %p "
1113                                                 "has check condition\n", cp);
1114                                         break;
1115                                 }
1116                         }
1117
1118                         if (sense_key == NOT_READY) {
1119                                 /* If Sense is Not Ready, Logical Unit
1120                                  * Not ready, Manual Intervention
1121                                  * required
1122                                  */
1123                                 if ((asc == 0x04) && (ascq == 0x03)) {
1124                                         dev_warn(&h->pdev->dev, "cp %p "
1125                                                 "has check condition: unit "
1126                                                 "not ready, manual "
1127                                                 "intervention required\n", cp);
1128                                         break;
1129                                 }
1130                         }
1131                         if (sense_key == ABORTED_COMMAND) {
1132                                 /* Aborted command is retryable */
1133                                 dev_warn(&h->pdev->dev, "cp %p "
1134                                         "has check condition: aborted command: "
1135                                         "ASC: 0x%x, ASCQ: 0x%x\n",
1136                                         cp, asc, ascq);
1137                                 cmd->result = DID_SOFT_ERROR << 16;
1138                                 break;
1139                         }
1140                         /* Must be some other type of check condition */
1141                         dev_warn(&h->pdev->dev, "cp %p has check condition: "
1142                                         "unknown type: "
1143                                         "Sense: 0x%x, ASC: 0x%x, ASCQ: 0x%x, "
1144                                         "Returning result: 0x%x, "
1145                                         "cmd=[%02x %02x %02x %02x %02x "
1146                                         "%02x %02x %02x %02x %02x %02x "
1147                                         "%02x %02x %02x %02x %02x]\n",
1148                                         cp, sense_key, asc, ascq,
1149                                         cmd->result,
1150                                         cmd->cmnd[0], cmd->cmnd[1],
1151                                         cmd->cmnd[2], cmd->cmnd[3],
1152                                         cmd->cmnd[4], cmd->cmnd[5],
1153                                         cmd->cmnd[6], cmd->cmnd[7],
1154                                         cmd->cmnd[8], cmd->cmnd[9],
1155                                         cmd->cmnd[10], cmd->cmnd[11],
1156                                         cmd->cmnd[12], cmd->cmnd[13],
1157                                         cmd->cmnd[14], cmd->cmnd[15]);
1158                         break;
1159                 }
1160
1161
1162                 /* Problem was not a check condition
1163                  * Pass it up to the upper layers...
1164                  */
1165                 if (ei->ScsiStatus) {
1166                         dev_warn(&h->pdev->dev, "cp %p has status 0x%x "
1167                                 "Sense: 0x%x, ASC: 0x%x, ASCQ: 0x%x, "
1168                                 "Returning result: 0x%x\n",
1169                                 cp, ei->ScsiStatus,
1170                                 sense_key, asc, ascq,
1171                                 cmd->result);
1172                 } else {  /* scsi status is zero??? How??? */
1173                         dev_warn(&h->pdev->dev, "cp %p SCSI status was 0. "
1174                                 "Returning no connection.\n", cp),
1175
1176                         /* Ordinarily, this case should never happen,
1177                          * but there is a bug in some released firmware
1178                          * revisions that allows it to happen if, for
1179                          * example, a 4100 backplane loses power and
1180                          * the tape drive is in it.  We assume that
1181                          * it's a fatal error of some kind because we
1182                          * can't show that it wasn't. We will make it
1183                          * look like selection timeout since that is
1184                          * the most common reason for this to occur,
1185                          * and it's severe enough.
1186                          */
1187
1188                         cmd->result = DID_NO_CONNECT << 16;
1189                 }
1190                 break;
1191
1192         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
1193                 break;
1194         case CMD_DATA_OVERRUN:
1195                 dev_warn(&h->pdev->dev, "cp %p has"
1196                         " completed with data overrun "
1197                         "reported\n", cp);
1198                 break;
1199         case CMD_INVALID: {
1200                 /* print_bytes(cp, sizeof(*cp), 1, 0);
1201                 print_cmd(cp); */
1202                 /* We get CMD_INVALID if you address a non-existent device
1203                  * instead of a selection timeout (no response).  You will
1204                  * see this if you yank out a drive, then try to access it.
1205                  * This is kind of a shame because it means that any other
1206                  * CMD_INVALID (e.g. driver bug) will get interpreted as a
1207                  * missing target. */
1208                 cmd->result = DID_NO_CONNECT << 16;
1209         }
1210                 break;
1211         case CMD_PROTOCOL_ERR:
1212                 cmd->result = DID_ERROR << 16;
1213                 dev_warn(&h->pdev->dev, "cp %p has "
1214                         "protocol error\n", cp);
1215                 break;
1216         case CMD_HARDWARE_ERR:
1217                 cmd->result = DID_ERROR << 16;
1218                 dev_warn(&h->pdev->dev, "cp %p had  hardware error\n", cp);
1219                 break;
1220         case CMD_CONNECTION_LOST:
1221                 cmd->result = DID_ERROR << 16;
1222                 dev_warn(&h->pdev->dev, "cp %p had connection lost\n", cp);
1223                 break;
1224         case CMD_ABORTED:
1225                 cmd->result = DID_ABORT << 16;
1226                 dev_warn(&h->pdev->dev, "cp %p was aborted with status 0x%x\n",
1227                                 cp, ei->ScsiStatus);
1228                 break;
1229         case CMD_ABORT_FAILED:
1230                 cmd->result = DID_ERROR << 16;
1231                 dev_warn(&h->pdev->dev, "cp %p reports abort failed\n", cp);
1232                 break;
1233         case CMD_UNSOLICITED_ABORT:
1234                 cmd->result = DID_RESET << 16;
1235                 dev_warn(&h->pdev->dev, "cp %p aborted do to an unsolicited "
1236                         "abort\n", cp);
1237                 break;
1238         case CMD_TIMEOUT:
1239                 cmd->result = DID_TIME_OUT << 16;
1240                 dev_warn(&h->pdev->dev, "cp %p timedout\n", cp);
1241                 break;
1242         case CMD_UNABORTABLE:
1243                 cmd->result = DID_ERROR << 16;
1244                 dev_warn(&h->pdev->dev, "Command unabortable\n");
1245                 break;
1246         default:
1247                 cmd->result = DID_ERROR << 16;
1248                 dev_warn(&h->pdev->dev, "cp %p returned unknown status %x\n",
1249                                 cp, ei->CommandStatus);
1250         }
1251         cmd->scsi_done(cmd);
1252         cmd_free(h, cp);
1253 }
1254
1255 static int hpsa_scsi_detect(struct ctlr_info *h)
1256 {
1257         struct Scsi_Host *sh;
1258         int error;
1259
1260         sh = scsi_host_alloc(&hpsa_driver_template, sizeof(h));
1261         if (sh == NULL)
1262                 goto fail;
1263
1264         sh->io_port = 0;
1265         sh->n_io_port = 0;
1266         sh->this_id = -1;
1267         sh->max_channel = 3;
1268         sh->max_cmd_len = MAX_COMMAND_SIZE;
1269         sh->max_lun = HPSA_MAX_LUN;
1270         sh->max_id = HPSA_MAX_LUN;
1271         sh->can_queue = h->nr_cmds;
1272         sh->cmd_per_lun = h->nr_cmds;
1273         sh->sg_tablesize = h->maxsgentries;
1274         h->scsi_host = sh;
1275         sh->hostdata[0] = (unsigned long) h;
1276         sh->irq = h->intr[h->intr_mode];
1277         sh->unique_id = sh->irq;
1278         error = scsi_add_host(sh, &h->pdev->dev);
1279         if (error)
1280                 goto fail_host_put;
1281         scsi_scan_host(sh);
1282         return 0;
1283
1284  fail_host_put:
1285         dev_err(&h->pdev->dev, "hpsa_scsi_detect: scsi_add_host"
1286                 " failed for controller %d\n", h->ctlr);
1287         scsi_host_put(sh);
1288         return error;
1289  fail:
1290         dev_err(&h->pdev->dev, "hpsa_scsi_detect: scsi_host_alloc"
1291                 " failed for controller %d\n", h->ctlr);
1292         return -ENOMEM;
1293 }
1294
1295 static void hpsa_pci_unmap(struct pci_dev *pdev,
1296         struct CommandList *c, int sg_used, int data_direction)
1297 {
1298         int i;
1299         union u64bit addr64;
1300
1301         for (i = 0; i < sg_used; i++) {
1302                 addr64.val32.lower = c->SG[i].Addr.lower;
1303                 addr64.val32.upper = c->SG[i].Addr.upper;
1304                 pci_unmap_single(pdev, (dma_addr_t) addr64.val, c->SG[i].Len,
1305                         data_direction);
1306         }
1307 }
1308
1309 static void hpsa_map_one(struct pci_dev *pdev,
1310                 struct CommandList *cp,
1311                 unsigned char *buf,
1312                 size_t buflen,
1313                 int data_direction)
1314 {
1315         u64 addr64;
1316
1317         if (buflen == 0 || data_direction == PCI_DMA_NONE) {
1318                 cp->Header.SGList = 0;
1319                 cp->Header.SGTotal = 0;
1320                 return;
1321         }
1322
1323         addr64 = (u64) pci_map_single(pdev, buf, buflen, data_direction);
1324         cp->SG[0].Addr.lower =
1325           (u32) (addr64 & (u64) 0x00000000FFFFFFFF);
1326         cp->SG[0].Addr.upper =
1327           (u32) ((addr64 >> 32) & (u64) 0x00000000FFFFFFFF);
1328         cp->SG[0].Len = buflen;
1329         cp->Header.SGList = (u8) 1;   /* no. SGs contig in this cmd */
1330         cp->Header.SGTotal = (u16) 1; /* total sgs in this cmd list */
1331 }
1332
1333 static inline void hpsa_scsi_do_simple_cmd_core(struct ctlr_info *h,
1334         struct CommandList *c)
1335 {
1336         DECLARE_COMPLETION_ONSTACK(wait);
1337
1338         c->waiting = &wait;
1339         enqueue_cmd_and_start_io(h, c);
1340         wait_for_completion(&wait);
1341 }
1342
1343 static void hpsa_scsi_do_simple_cmd_with_retry(struct ctlr_info *h,
1344         struct CommandList *c, int data_direction)
1345 {
1346         int retry_count = 0;
1347
1348         do {
1349                 memset(c->err_info, 0, sizeof(*c->err_info));
1350                 hpsa_scsi_do_simple_cmd_core(h, c);
1351                 retry_count++;
1352         } while (check_for_unit_attention(h, c) && retry_count <= 3);
1353         hpsa_pci_unmap(h->pdev, c, 1, data_direction);
1354 }
1355
1356 static void hpsa_scsi_interpret_error(struct CommandList *cp)
1357 {
1358         struct ErrorInfo *ei;
1359         struct device *d = &cp->h->pdev->dev;
1360
1361         ei = cp->err_info;
1362         switch (ei->CommandStatus) {
1363         case CMD_TARGET_STATUS:
1364                 dev_warn(d, "cmd %p has completed with errors\n", cp);
1365                 dev_warn(d, "cmd %p has SCSI Status = %x\n", cp,
1366                                 ei->ScsiStatus);
1367                 if (ei->ScsiStatus == 0)
1368                         dev_warn(d, "SCSI status is abnormally zero.  "
1369                         "(probably indicates selection timeout "
1370                         "reported incorrectly due to a known "
1371                         "firmware bug, circa July, 2001.)\n");
1372                 break;
1373         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
1374                         dev_info(d, "UNDERRUN\n");
1375                 break;
1376         case CMD_DATA_OVERRUN:
1377                 dev_warn(d, "cp %p has completed with data overrun\n", cp);
1378                 break;
1379         case CMD_INVALID: {
1380                 /* controller unfortunately reports SCSI passthru's
1381                  * to non-existent targets as invalid commands.
1382                  */
1383                 dev_warn(d, "cp %p is reported invalid (probably means "
1384                         "target device no longer present)\n", cp);
1385                 /* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0);
1386                 print_cmd(cp);  */
1387                 }
1388                 break;
1389         case CMD_PROTOCOL_ERR:
1390                 dev_warn(d, "cp %p has protocol error \n", cp);
1391                 break;
1392         case CMD_HARDWARE_ERR:
1393                 /* cmd->result = DID_ERROR << 16; */
1394                 dev_warn(d, "cp %p had hardware error\n", cp);
1395                 break;
1396         case CMD_CONNECTION_LOST:
1397                 dev_warn(d, "cp %p had connection lost\n", cp);
1398                 break;
1399         case CMD_ABORTED:
1400                 dev_warn(d, "cp %p was aborted\n", cp);
1401                 break;
1402         case CMD_ABORT_FAILED:
1403                 dev_warn(d, "cp %p reports abort failed\n", cp);
1404                 break;
1405         case CMD_UNSOLICITED_ABORT:
1406                 dev_warn(d, "cp %p aborted due to an unsolicited abort\n", cp);
1407                 break;
1408         case CMD_TIMEOUT:
1409                 dev_warn(d, "cp %p timed out\n", cp);
1410                 break;
1411         case CMD_UNABORTABLE:
1412                 dev_warn(d, "Command unabortable\n");
1413                 break;
1414         default:
1415                 dev_warn(d, "cp %p returned unknown status %x\n", cp,
1416                                 ei->CommandStatus);
1417         }
1418 }
1419
1420 static int hpsa_scsi_do_inquiry(struct ctlr_info *h, unsigned char *scsi3addr,
1421                         unsigned char page, unsigned char *buf,
1422                         unsigned char bufsize)
1423 {
1424         int rc = IO_OK;
1425         struct CommandList *c;
1426         struct ErrorInfo *ei;
1427
1428         c = cmd_special_alloc(h);
1429
1430         if (c == NULL) {                        /* trouble... */
1431                 dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
1432                 return -ENOMEM;
1433         }
1434
1435         fill_cmd(c, HPSA_INQUIRY, h, buf, bufsize, page, scsi3addr, TYPE_CMD);
1436         hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_FROMDEVICE);
1437         ei = c->err_info;
1438         if (ei->CommandStatus != 0 && ei->CommandStatus != CMD_DATA_UNDERRUN) {
1439                 hpsa_scsi_interpret_error(c);
1440                 rc = -1;
1441         }
1442         cmd_special_free(h, c);
1443         return rc;
1444 }
1445
1446 static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr)
1447 {
1448         int rc = IO_OK;
1449         struct CommandList *c;
1450         struct ErrorInfo *ei;
1451
1452         c = cmd_special_alloc(h);
1453
1454         if (c == NULL) {                        /* trouble... */
1455                 dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
1456                 return -ENOMEM;
1457         }
1458
1459         fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0, scsi3addr, TYPE_MSG);
1460         hpsa_scsi_do_simple_cmd_core(h, c);
1461         /* no unmap needed here because no data xfer. */
1462
1463         ei = c->err_info;
1464         if (ei->CommandStatus != 0) {
1465                 hpsa_scsi_interpret_error(c);
1466                 rc = -1;
1467         }
1468         cmd_special_free(h, c);
1469         return rc;
1470 }
1471
1472 static void hpsa_get_raid_level(struct ctlr_info *h,
1473         unsigned char *scsi3addr, unsigned char *raid_level)
1474 {
1475         int rc;
1476         unsigned char *buf;
1477
1478         *raid_level = RAID_UNKNOWN;
1479         buf = kzalloc(64, GFP_KERNEL);
1480         if (!buf)
1481                 return;
1482         rc = hpsa_scsi_do_inquiry(h, scsi3addr, 0xC1, buf, 64);
1483         if (rc == 0)
1484                 *raid_level = buf[8];
1485         if (*raid_level > RAID_UNKNOWN)
1486                 *raid_level = RAID_UNKNOWN;
1487         kfree(buf);
1488         return;
1489 }
1490
1491 /* Get the device id from inquiry page 0x83 */
1492 static int hpsa_get_device_id(struct ctlr_info *h, unsigned char *scsi3addr,
1493         unsigned char *device_id, int buflen)
1494 {
1495         int rc;
1496         unsigned char *buf;
1497
1498         if (buflen > 16)
1499                 buflen = 16;
1500         buf = kzalloc(64, GFP_KERNEL);
1501         if (!buf)
1502                 return -1;
1503         rc = hpsa_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
1504         if (rc == 0)
1505                 memcpy(device_id, &buf[8], buflen);
1506         kfree(buf);
1507         return rc != 0;
1508 }
1509
1510 static int hpsa_scsi_do_report_luns(struct ctlr_info *h, int logical,
1511                 struct ReportLUNdata *buf, int bufsize,
1512                 int extended_response)
1513 {
1514         int rc = IO_OK;
1515         struct CommandList *c;
1516         unsigned char scsi3addr[8];
1517         struct ErrorInfo *ei;
1518
1519         c = cmd_special_alloc(h);
1520         if (c == NULL) {                        /* trouble... */
1521                 dev_err(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
1522                 return -1;
1523         }
1524         /* address the controller */
1525         memset(scsi3addr, 0, sizeof(scsi3addr));
1526         fill_cmd(c, logical ? HPSA_REPORT_LOG : HPSA_REPORT_PHYS, h,
1527                 buf, bufsize, 0, scsi3addr, TYPE_CMD);
1528         if (extended_response)
1529                 c->Request.CDB[1] = extended_response;
1530         hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_FROMDEVICE);
1531         ei = c->err_info;
1532         if (ei->CommandStatus != 0 &&
1533             ei->CommandStatus != CMD_DATA_UNDERRUN) {
1534                 hpsa_scsi_interpret_error(c);
1535                 rc = -1;
1536         }
1537         cmd_special_free(h, c);
1538         return rc;
1539 }
1540
1541 static inline int hpsa_scsi_do_report_phys_luns(struct ctlr_info *h,
1542                 struct ReportLUNdata *buf,
1543                 int bufsize, int extended_response)
1544 {
1545         return hpsa_scsi_do_report_luns(h, 0, buf, bufsize, extended_response);
1546 }
1547
1548 static inline int hpsa_scsi_do_report_log_luns(struct ctlr_info *h,
1549                 struct ReportLUNdata *buf, int bufsize)
1550 {
1551         return hpsa_scsi_do_report_luns(h, 1, buf, bufsize, 0);
1552 }
1553
1554 static inline void hpsa_set_bus_target_lun(struct hpsa_scsi_dev_t *device,
1555         int bus, int target, int lun)
1556 {
1557         device->bus = bus;
1558         device->target = target;
1559         device->lun = lun;
1560 }
1561
1562 static int hpsa_update_device_info(struct ctlr_info *h,
1563         unsigned char scsi3addr[], struct hpsa_scsi_dev_t *this_device,
1564         unsigned char *is_OBDR_device)
1565 {
1566
1567 #define OBDR_SIG_OFFSET 43
1568 #define OBDR_TAPE_SIG "$DR-10"
1569 #define OBDR_SIG_LEN (sizeof(OBDR_TAPE_SIG) - 1)
1570 #define OBDR_TAPE_INQ_SIZE (OBDR_SIG_OFFSET + OBDR_SIG_LEN)
1571
1572         unsigned char *inq_buff;
1573         unsigned char *obdr_sig;
1574
1575         inq_buff = kzalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1576         if (!inq_buff)
1577                 goto bail_out;
1578
1579         /* Do an inquiry to the device to see what it is. */
1580         if (hpsa_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
1581                 (unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
1582                 /* Inquiry failed (msg printed already) */
1583                 dev_err(&h->pdev->dev,
1584                         "hpsa_update_device_info: inquiry failed\n");
1585                 goto bail_out;
1586         }
1587
1588         this_device->devtype = (inq_buff[0] & 0x1f);
1589         memcpy(this_device->scsi3addr, scsi3addr, 8);
1590         memcpy(this_device->vendor, &inq_buff[8],
1591                 sizeof(this_device->vendor));
1592         memcpy(this_device->model, &inq_buff[16],
1593                 sizeof(this_device->model));
1594         memset(this_device->device_id, 0,
1595                 sizeof(this_device->device_id));
1596         hpsa_get_device_id(h, scsi3addr, this_device->device_id,
1597                 sizeof(this_device->device_id));
1598
1599         if (this_device->devtype == TYPE_DISK &&
1600                 is_logical_dev_addr_mode(scsi3addr))
1601                 hpsa_get_raid_level(h, scsi3addr, &this_device->raid_level);
1602         else
1603                 this_device->raid_level = RAID_UNKNOWN;
1604
1605         if (is_OBDR_device) {
1606                 /* See if this is a One-Button-Disaster-Recovery device
1607                  * by looking for "$DR-10" at offset 43 in inquiry data.
1608                  */
1609                 obdr_sig = &inq_buff[OBDR_SIG_OFFSET];
1610                 *is_OBDR_device = (this_device->devtype == TYPE_ROM &&
1611                                         strncmp(obdr_sig, OBDR_TAPE_SIG,
1612                                                 OBDR_SIG_LEN) == 0);
1613         }
1614
1615         kfree(inq_buff);
1616         return 0;
1617
1618 bail_out:
1619         kfree(inq_buff);
1620         return 1;
1621 }
1622
1623 static unsigned char *msa2xxx_model[] = {
1624         "MSA2012",
1625         "MSA2024",
1626         "MSA2312",
1627         "MSA2324",
1628         "P2000 G3 SAS",
1629         NULL,
1630 };
1631
1632 static int is_msa2xxx(struct ctlr_info *h, struct hpsa_scsi_dev_t *device)
1633 {
1634         int i;
1635
1636         for (i = 0; msa2xxx_model[i]; i++)
1637                 if (strncmp(device->model, msa2xxx_model[i],
1638                         strlen(msa2xxx_model[i])) == 0)
1639                         return 1;
1640         return 0;
1641 }
1642
1643 /* Helper function to assign bus, target, lun mapping of devices.
1644  * Puts non-msa2xxx logical volumes on bus 0, msa2xxx logical
1645  * volumes on bus 1, physical devices on bus 2. and the hba on bus 3.
1646  * Logical drive target and lun are assigned at this time, but
1647  * physical device lun and target assignment are deferred (assigned
1648  * in hpsa_find_target_lun, called by hpsa_scsi_add_entry.)
1649  */
1650 static void figure_bus_target_lun(struct ctlr_info *h,
1651         u8 *lunaddrbytes, int *bus, int *target, int *lun,
1652         struct hpsa_scsi_dev_t *device)
1653 {
1654         u32 lunid;
1655
1656         if (is_logical_dev_addr_mode(lunaddrbytes)) {
1657                 /* logical device */
1658                 lunid = le32_to_cpu(*((__le32 *) lunaddrbytes));
1659                 if (is_msa2xxx(h, device)) {
1660                         /* msa2xxx way, put logicals on bus 1
1661                          * and match target/lun numbers box
1662                          * reports.
1663                          */
1664                         *bus = 1;
1665                         *target = (lunid >> 16) & 0x3fff;
1666                         *lun = lunid & 0x00ff;
1667                 } else {
1668                         if (likely(is_scsi_rev_5(h))) {
1669                                 /* All current smart arrays (circa 2011) */
1670                                 *bus = 0;
1671                                 *target = 0;
1672                                 *lun = (lunid & 0x3fff) + 1;
1673                         } else {
1674                                 /* Traditional old smart array way. */
1675                                 *bus = 0;
1676                                 *target = lunid & 0x3fff;
1677                                 *lun = 0;
1678                         }
1679                 }
1680         } else {
1681                 /* physical device */
1682                 if (is_hba_lunid(lunaddrbytes))
1683                         if (unlikely(is_scsi_rev_5(h))) {
1684                                 *bus = 0; /* put p1210m ctlr at 0,0,0 */
1685                                 *target = 0;
1686                                 *lun = 0;
1687                                 return;
1688                         } else
1689                                 *bus = 3; /* traditional smartarray */
1690                 else
1691                         *bus = 2; /* physical disk */
1692                 *target = -1;
1693                 *lun = -1; /* we will fill these in later. */
1694         }
1695 }
1696
1697 /*
1698  * If there is no lun 0 on a target, linux won't find any devices.
1699  * For the MSA2xxx boxes, we have to manually detect the enclosure
1700  * which is at lun zero, as CCISS_REPORT_PHYSICAL_LUNS doesn't report
1701  * it for some reason.  *tmpdevice is the target we're adding,
1702  * this_device is a pointer into the current element of currentsd[]
1703  * that we're building up in update_scsi_devices(), below.
1704  * lunzerobits is a bitmap that tracks which targets already have a
1705  * lun 0 assigned.
1706  * Returns 1 if an enclosure was added, 0 if not.
1707  */
1708 static int add_msa2xxx_enclosure_device(struct ctlr_info *h,
1709         struct hpsa_scsi_dev_t *tmpdevice,
1710         struct hpsa_scsi_dev_t *this_device, u8 *lunaddrbytes,
1711         int bus, int target, int lun, unsigned long lunzerobits[],
1712         int *nmsa2xxx_enclosures)
1713 {
1714         unsigned char scsi3addr[8];
1715
1716         if (test_bit(target, lunzerobits))
1717                 return 0; /* There is already a lun 0 on this target. */
1718
1719         if (!is_logical_dev_addr_mode(lunaddrbytes))
1720                 return 0; /* It's the logical targets that may lack lun 0. */
1721
1722         if (!is_msa2xxx(h, tmpdevice))
1723                 return 0; /* It's only the MSA2xxx that have this problem. */
1724
1725         if (lun == 0) /* if lun is 0, then obviously we have a lun 0. */
1726                 return 0;
1727
1728         memset(scsi3addr, 0, 8);
1729         scsi3addr[3] = target;
1730         if (is_hba_lunid(scsi3addr))
1731                 return 0; /* Don't add the RAID controller here. */
1732
1733         if (is_scsi_rev_5(h))
1734                 return 0; /* p1210m doesn't need to do this. */
1735
1736 #define MAX_MSA2XXX_ENCLOSURES 32
1737         if (*nmsa2xxx_enclosures >= MAX_MSA2XXX_ENCLOSURES) {
1738                 dev_warn(&h->pdev->dev, "Maximum number of MSA2XXX "
1739                         "enclosures exceeded.  Check your hardware "
1740                         "configuration.");
1741                 return 0;
1742         }
1743
1744         if (hpsa_update_device_info(h, scsi3addr, this_device, NULL))
1745                 return 0;
1746         (*nmsa2xxx_enclosures)++;
1747         hpsa_set_bus_target_lun(this_device, bus, target, 0);
1748         set_bit(target, lunzerobits);
1749         return 1;
1750 }
1751
1752 /*
1753  * Do CISS_REPORT_PHYS and CISS_REPORT_LOG.  Data is returned in physdev,
1754  * logdev.  The number of luns in physdev and logdev are returned in
1755  * *nphysicals and *nlogicals, respectively.
1756  * Returns 0 on success, -1 otherwise.
1757  */
1758 static int hpsa_gather_lun_info(struct ctlr_info *h,
1759         int reportlunsize,
1760         struct ReportLUNdata *physdev, u32 *nphysicals,
1761         struct ReportLUNdata *logdev, u32 *nlogicals)
1762 {
1763         if (hpsa_scsi_do_report_phys_luns(h, physdev, reportlunsize, 0)) {
1764                 dev_err(&h->pdev->dev, "report physical LUNs failed.\n");
1765                 return -1;
1766         }
1767         *nphysicals = be32_to_cpu(*((__be32 *)physdev->LUNListLength)) / 8;
1768         if (*nphysicals > HPSA_MAX_PHYS_LUN) {
1769                 dev_warn(&h->pdev->dev, "maximum physical LUNs (%d) exceeded."
1770                         "  %d LUNs ignored.\n", HPSA_MAX_PHYS_LUN,
1771                         *nphysicals - HPSA_MAX_PHYS_LUN);
1772                 *nphysicals = HPSA_MAX_PHYS_LUN;
1773         }
1774         if (hpsa_scsi_do_report_log_luns(h, logdev, reportlunsize)) {
1775                 dev_err(&h->pdev->dev, "report logical LUNs failed.\n");
1776                 return -1;
1777         }
1778         *nlogicals = be32_to_cpu(*((__be32 *) logdev->LUNListLength)) / 8;
1779         /* Reject Logicals in excess of our max capability. */
1780         if (*nlogicals > HPSA_MAX_LUN) {
1781                 dev_warn(&h->pdev->dev,
1782                         "maximum logical LUNs (%d) exceeded.  "
1783                         "%d LUNs ignored.\n", HPSA_MAX_LUN,
1784                         *nlogicals - HPSA_MAX_LUN);
1785                         *nlogicals = HPSA_MAX_LUN;
1786         }
1787         if (*nlogicals + *nphysicals > HPSA_MAX_PHYS_LUN) {
1788                 dev_warn(&h->pdev->dev,
1789                         "maximum logical + physical LUNs (%d) exceeded. "
1790                         "%d LUNs ignored.\n", HPSA_MAX_PHYS_LUN,
1791                         *nphysicals + *nlogicals - HPSA_MAX_PHYS_LUN);
1792                 *nlogicals = HPSA_MAX_PHYS_LUN - *nphysicals;
1793         }
1794         return 0;
1795 }
1796
1797 u8 *figure_lunaddrbytes(struct ctlr_info *h, int raid_ctlr_position, int i,
1798         int nphysicals, int nlogicals, struct ReportLUNdata *physdev_list,
1799         struct ReportLUNdata *logdev_list)
1800 {
1801         /* Helper function, figure out where the LUN ID info is coming from
1802          * given index i, lists of physical and logical devices, where in
1803          * the list the raid controller is supposed to appear (first or last)
1804          */
1805
1806         int logicals_start = nphysicals + (raid_ctlr_position == 0);
1807         int last_device = nphysicals + nlogicals + (raid_ctlr_position == 0);
1808
1809         if (i == raid_ctlr_position)
1810                 return RAID_CTLR_LUNID;
1811
1812         if (i < logicals_start)
1813                 return &physdev_list->LUN[i - (raid_ctlr_position == 0)][0];
1814
1815         if (i < last_device)
1816                 return &logdev_list->LUN[i - nphysicals -
1817                         (raid_ctlr_position == 0)][0];
1818         BUG();
1819         return NULL;
1820 }
1821
1822 static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno)
1823 {
1824         /* the idea here is we could get notified
1825          * that some devices have changed, so we do a report
1826          * physical luns and report logical luns cmd, and adjust
1827          * our list of devices accordingly.
1828          *
1829          * The scsi3addr's of devices won't change so long as the
1830          * adapter is not reset.  That means we can rescan and
1831          * tell which devices we already know about, vs. new
1832          * devices, vs.  disappearing devices.
1833          */
1834         struct ReportLUNdata *physdev_list = NULL;
1835         struct ReportLUNdata *logdev_list = NULL;
1836         u32 nphysicals = 0;
1837         u32 nlogicals = 0;
1838         u32 ndev_allocated = 0;
1839         struct hpsa_scsi_dev_t **currentsd, *this_device, *tmpdevice;
1840         int ncurrent = 0;
1841         int reportlunsize = sizeof(*physdev_list) + HPSA_MAX_PHYS_LUN * 8;
1842         int i, nmsa2xxx_enclosures, ndevs_to_allocate;
1843         int bus, target, lun;
1844         int raid_ctlr_position;
1845         DECLARE_BITMAP(lunzerobits, HPSA_MAX_TARGETS_PER_CTLR);
1846
1847         currentsd = kzalloc(sizeof(*currentsd) * HPSA_MAX_SCSI_DEVS_PER_HBA,
1848                 GFP_KERNEL);
1849         physdev_list = kzalloc(reportlunsize, GFP_KERNEL);
1850         logdev_list = kzalloc(reportlunsize, GFP_KERNEL);
1851         tmpdevice = kzalloc(sizeof(*tmpdevice), GFP_KERNEL);
1852
1853         if (!currentsd || !physdev_list || !logdev_list || !tmpdevice) {
1854                 dev_err(&h->pdev->dev, "out of memory\n");
1855                 goto out;
1856         }
1857         memset(lunzerobits, 0, sizeof(lunzerobits));
1858
1859         if (hpsa_gather_lun_info(h, reportlunsize, physdev_list, &nphysicals,
1860                         logdev_list, &nlogicals))
1861                 goto out;
1862
1863         /* We might see up to 32 MSA2xxx enclosures, actually 8 of them
1864          * but each of them 4 times through different paths.  The plus 1
1865          * is for the RAID controller.
1866          */
1867         ndevs_to_allocate = nphysicals + nlogicals + MAX_MSA2XXX_ENCLOSURES + 1;
1868
1869         /* Allocate the per device structures */
1870         for (i = 0; i < ndevs_to_allocate; i++) {
1871                 currentsd[i] = kzalloc(sizeof(*currentsd[i]), GFP_KERNEL);
1872                 if (!currentsd[i]) {
1873                         dev_warn(&h->pdev->dev, "out of memory at %s:%d\n",
1874                                 __FILE__, __LINE__);
1875                         goto out;
1876                 }
1877                 ndev_allocated++;
1878         }
1879
1880         if (unlikely(is_scsi_rev_5(h)))
1881                 raid_ctlr_position = 0;
1882         else
1883                 raid_ctlr_position = nphysicals + nlogicals;
1884
1885         /* adjust our table of devices */
1886         nmsa2xxx_enclosures = 0;
1887         for (i = 0; i < nphysicals + nlogicals + 1; i++) {
1888                 u8 *lunaddrbytes, is_OBDR = 0;
1889
1890                 /* Figure out where the LUN ID info is coming from */
1891                 lunaddrbytes = figure_lunaddrbytes(h, raid_ctlr_position,
1892                         i, nphysicals, nlogicals, physdev_list, logdev_list);
1893                 /* skip masked physical devices. */
1894                 if (lunaddrbytes[3] & 0xC0 &&
1895                         i < nphysicals + (raid_ctlr_position == 0))
1896                         continue;
1897
1898                 /* Get device type, vendor, model, device id */
1899                 if (hpsa_update_device_info(h, lunaddrbytes, tmpdevice,
1900                                                         &is_OBDR))
1901                         continue; /* skip it if we can't talk to it. */
1902                 figure_bus_target_lun(h, lunaddrbytes, &bus, &target, &lun,
1903                         tmpdevice);
1904                 this_device = currentsd[ncurrent];
1905
1906                 /*
1907                  * For the msa2xxx boxes, we have to insert a LUN 0 which
1908                  * doesn't show up in CCISS_REPORT_PHYSICAL data, but there
1909                  * is nonetheless an enclosure device there.  We have to
1910                  * present that otherwise linux won't find anything if
1911                  * there is no lun 0.
1912                  */
1913                 if (add_msa2xxx_enclosure_device(h, tmpdevice, this_device,
1914                                 lunaddrbytes, bus, target, lun, lunzerobits,
1915                                 &nmsa2xxx_enclosures)) {
1916                         ncurrent++;
1917                         this_device = currentsd[ncurrent];
1918                 }
1919
1920                 *this_device = *tmpdevice;
1921                 hpsa_set_bus_target_lun(this_device, bus, target, lun);
1922
1923                 switch (this_device->devtype) {
1924                 case TYPE_ROM:
1925                         /* We don't *really* support actual CD-ROM devices,
1926                          * just "One Button Disaster Recovery" tape drive
1927                          * which temporarily pretends to be a CD-ROM drive.
1928                          * So we check that the device is really an OBDR tape
1929                          * device by checking for "$DR-10" in bytes 43-48 of
1930                          * the inquiry data.
1931                          */
1932                         if (is_OBDR)
1933                                 ncurrent++;
1934                         break;
1935                 case TYPE_DISK:
1936                         if (i < nphysicals)
1937                                 break;
1938                         ncurrent++;
1939                         break;
1940                 case TYPE_TAPE:
1941                 case TYPE_MEDIUM_CHANGER:
1942                         ncurrent++;
1943                         break;
1944                 case TYPE_RAID:
1945                         /* Only present the Smartarray HBA as a RAID controller.
1946                          * If it's a RAID controller other than the HBA itself
1947                          * (an external RAID controller, MSA500 or similar)
1948                          * don't present it.
1949                          */
1950                         if (!is_hba_lunid(lunaddrbytes))
1951                                 break;
1952                         ncurrent++;
1953                         break;
1954                 default:
1955                         break;
1956                 }
1957                 if (ncurrent >= HPSA_MAX_SCSI_DEVS_PER_HBA)
1958                         break;
1959         }
1960         adjust_hpsa_scsi_table(h, hostno, currentsd, ncurrent);
1961 out:
1962         kfree(tmpdevice);
1963         for (i = 0; i < ndev_allocated; i++)
1964                 kfree(currentsd[i]);
1965         kfree(currentsd);
1966         kfree(physdev_list);
1967         kfree(logdev_list);
1968 }
1969
1970 /* hpsa_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
1971  * dma mapping  and fills in the scatter gather entries of the
1972  * hpsa command, cp.
1973  */
1974 static int hpsa_scatter_gather(struct ctlr_info *h,
1975                 struct CommandList *cp,
1976                 struct scsi_cmnd *cmd)
1977 {
1978         unsigned int len;
1979         struct scatterlist *sg;
1980         u64 addr64;
1981         int use_sg, i, sg_index, chained;
1982         struct SGDescriptor *curr_sg;
1983
1984         BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);
1985
1986         use_sg = scsi_dma_map(cmd);
1987         if (use_sg < 0)
1988                 return use_sg;
1989
1990         if (!use_sg)
1991                 goto sglist_finished;
1992
1993         curr_sg = cp->SG;
1994         chained = 0;
1995         sg_index = 0;
1996         scsi_for_each_sg(cmd, sg, use_sg, i) {
1997                 if (i == h->max_cmd_sg_entries - 1 &&
1998                         use_sg > h->max_cmd_sg_entries) {
1999                         chained = 1;
2000                         curr_sg = h->cmd_sg_list[cp->cmdindex];
2001                         sg_index = 0;
2002                 }
2003                 addr64 = (u64) sg_dma_address(sg);
2004                 len  = sg_dma_len(sg);
2005                 curr_sg->Addr.lower = (u32) (addr64 & 0x0FFFFFFFFULL);
2006                 curr_sg->Addr.upper = (u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
2007                 curr_sg->Len = len;
2008                 curr_sg->Ext = 0;  /* we are not chaining */
2009                 curr_sg++;
2010         }
2011
2012         if (use_sg + chained > h->maxSG)
2013                 h->maxSG = use_sg + chained;
2014
2015         if (chained) {
2016                 cp->Header.SGList = h->max_cmd_sg_entries;
2017                 cp->Header.SGTotal = (u16) (use_sg + 1);
2018                 hpsa_map_sg_chain_block(h, cp);
2019                 return 0;
2020         }
2021
2022 sglist_finished:
2023
2024         cp->Header.SGList = (u8) use_sg;   /* no. SGs contig in this cmd */
2025         cp->Header.SGTotal = (u16) use_sg; /* total sgs in this cmd list */
2026         return 0;
2027 }
2028
2029
2030 static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
2031         void (*done)(struct scsi_cmnd *))
2032 {
2033         struct ctlr_info *h;
2034         struct hpsa_scsi_dev_t *dev;
2035         unsigned char scsi3addr[8];
2036         struct CommandList *c;
2037         unsigned long flags;
2038
2039         /* Get the ptr to our adapter structure out of cmd->host. */
2040         h = sdev_to_hba(cmd->device);
2041         dev = cmd->device->hostdata;
2042         if (!dev) {
2043                 cmd->result = DID_NO_CONNECT << 16;
2044                 done(cmd);
2045                 return 0;
2046         }
2047         memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));
2048
2049         /* Need a lock as this is being allocated from the pool */
2050         spin_lock_irqsave(&h->lock, flags);
2051         c = cmd_alloc(h);
2052         spin_unlock_irqrestore(&h->lock, flags);
2053         if (c == NULL) {                        /* trouble... */
2054                 dev_err(&h->pdev->dev, "cmd_alloc returned NULL!\n");
2055                 return SCSI_MLQUEUE_HOST_BUSY;
2056         }
2057
2058         /* Fill in the command list header */
2059
2060         cmd->scsi_done = done;    /* save this for use by completion code */
2061
2062         /* save c in case we have to abort it  */
2063         cmd->host_scribble = (unsigned char *) c;
2064
2065         c->cmd_type = CMD_SCSI;
2066         c->scsi_cmd = cmd;
2067         c->Header.ReplyQueue = 0;  /* unused in simple mode */
2068         memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
2069         c->Header.Tag.lower = (c->cmdindex << DIRECT_LOOKUP_SHIFT);
2070         c->Header.Tag.lower |= DIRECT_LOOKUP_BIT;
2071
2072         /* Fill in the request block... */
2073
2074         c->Request.Timeout = 0;
2075         memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
2076         BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
2077         c->Request.CDBLen = cmd->cmd_len;
2078         memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
2079         c->Request.Type.Type = TYPE_CMD;
2080         c->Request.Type.Attribute = ATTR_SIMPLE;
2081         switch (cmd->sc_data_direction) {
2082         case DMA_TO_DEVICE:
2083                 c->Request.Type.Direction = XFER_WRITE;
2084                 break;
2085         case DMA_FROM_DEVICE:
2086                 c->Request.Type.Direction = XFER_READ;
2087                 break;
2088         case DMA_NONE:
2089                 c->Request.Type.Direction = XFER_NONE;
2090                 break;
2091         case DMA_BIDIRECTIONAL:
2092                 /* This can happen if a buggy application does a scsi passthru
2093                  * and sets both inlen and outlen to non-zero. ( see
2094                  * ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
2095                  */
2096
2097                 c->Request.Type.Direction = XFER_RSVD;
2098                 /* This is technically wrong, and hpsa controllers should
2099                  * reject it with CMD_INVALID, which is the most correct
2100                  * response, but non-fibre backends appear to let it
2101                  * slide by, and give the same results as if this field
2102                  * were set correctly.  Either way is acceptable for
2103                  * our purposes here.
2104                  */
2105
2106                 break;
2107
2108         default:
2109                 dev_err(&h->pdev->dev, "unknown data direction: %d\n",
2110                         cmd->sc_data_direction);
2111                 BUG();
2112                 break;
2113         }
2114
2115         if (hpsa_scatter_gather(h, c, cmd) < 0) { /* Fill SG list */
2116                 cmd_free(h, c);
2117                 return SCSI_MLQUEUE_HOST_BUSY;
2118         }
2119         enqueue_cmd_and_start_io(h, c);
2120         /* the cmd'll come back via intr handler in complete_scsi_command()  */
2121         return 0;
2122 }
2123
2124 static DEF_SCSI_QCMD(hpsa_scsi_queue_command)
2125
2126 static void hpsa_scan_start(struct Scsi_Host *sh)
2127 {
2128         struct ctlr_info *h = shost_to_hba(sh);
2129         unsigned long flags;
2130
2131         /* wait until any scan already in progress is finished. */
2132         while (1) {
2133                 spin_lock_irqsave(&h->scan_lock, flags);
2134                 if (h->scan_finished)
2135                         break;
2136                 spin_unlock_irqrestore(&h->scan_lock, flags);
2137                 wait_event(h->scan_wait_queue, h->scan_finished);
2138                 /* Note: We don't need to worry about a race between this
2139                  * thread and driver unload because the midlayer will
2140                  * have incremented the reference count, so unload won't
2141                  * happen if we're in here.
2142                  */
2143         }
2144         h->scan_finished = 0; /* mark scan as in progress */
2145         spin_unlock_irqrestore(&h->scan_lock, flags);
2146
2147         hpsa_update_scsi_devices(h, h->scsi_host->host_no);
2148
2149         spin_lock_irqsave(&h->scan_lock, flags);
2150         h->scan_finished = 1; /* mark scan as finished. */
2151         wake_up_all(&h->scan_wait_queue);
2152         spin_unlock_irqrestore(&h->scan_lock, flags);
2153 }
2154
2155 static int hpsa_scan_finished(struct Scsi_Host *sh,
2156         unsigned long elapsed_time)
2157 {
2158         struct ctlr_info *h = shost_to_hba(sh);
2159         unsigned long flags;
2160         int finished;
2161
2162         spin_lock_irqsave(&h->scan_lock, flags);
2163         finished = h->scan_finished;
2164         spin_unlock_irqrestore(&h->scan_lock, flags);
2165         return finished;
2166 }
2167
2168 static int hpsa_change_queue_depth(struct scsi_device *sdev,
2169         int qdepth, int reason)
2170 {
2171         struct ctlr_info *h = sdev_to_hba(sdev);
2172
2173         if (reason != SCSI_QDEPTH_DEFAULT)
2174                 return -ENOTSUPP;
2175
2176         if (qdepth < 1)
2177                 qdepth = 1;
2178         else
2179                 if (qdepth > h->nr_cmds)
2180                         qdepth = h->nr_cmds;
2181         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2182         return sdev->queue_depth;
2183 }
2184
2185 static void hpsa_unregister_scsi(struct ctlr_info *h)
2186 {
2187         /* we are being forcibly unloaded, and may not refuse. */
2188         scsi_remove_host(h->scsi_host);
2189         scsi_host_put(h->scsi_host);
2190         h->scsi_host = NULL;
2191 }
2192
2193 static int hpsa_register_scsi(struct ctlr_info *h)
2194 {
2195         int rc;
2196
2197         rc = hpsa_scsi_detect(h);
2198         if (rc != 0)
2199                 dev_err(&h->pdev->dev, "hpsa_register_scsi: failed"
2200                         " hpsa_scsi_detect(), rc is %d\n", rc);
2201         return rc;
2202 }
2203
2204 static int wait_for_device_to_become_ready(struct ctlr_info *h,
2205         unsigned char lunaddr[])
2206 {
2207         int rc = 0;
2208         int count = 0;
2209         int waittime = 1; /* seconds */
2210         struct CommandList *c;
2211
2212         c = cmd_special_alloc(h);
2213         if (!c) {
2214                 dev_warn(&h->pdev->dev, "out of memory in "
2215                         "wait_for_device_to_become_ready.\n");
2216                 return IO_ERROR;
2217         }
2218
2219         /* Send test unit ready until device ready, or give up. */
2220         while (count < HPSA_TUR_RETRY_LIMIT) {
2221
2222                 /* Wait for a bit.  do this first, because if we send
2223                  * the TUR right away, the reset will just abort it.
2224                  */
2225                 msleep(1000 * waittime);
2226                 count++;
2227
2228                 /* Increase wait time with each try, up to a point. */
2229                 if (waittime < HPSA_MAX_WAIT_INTERVAL_SECS)
2230                         waittime = waittime * 2;
2231
2232                 /* Send the Test Unit Ready */
2233                 fill_cmd(c, TEST_UNIT_READY, h, NULL, 0, 0, lunaddr, TYPE_CMD);
2234                 hpsa_scsi_do_simple_cmd_core(h, c);
2235                 /* no unmap needed here because no data xfer. */
2236
2237                 if (c->err_info->CommandStatus == CMD_SUCCESS)
2238                         break;
2239
2240                 if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
2241                         c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION &&
2242                         (c->err_info->SenseInfo[2] == NO_SENSE ||
2243                         c->err_info->SenseInfo[2] == UNIT_ATTENTION))
2244                         break;
2245
2246                 dev_warn(&h->pdev->dev, "waiting %d secs "
2247                         "for device to become ready.\n", waittime);
2248                 rc = 1; /* device not ready. */
2249         }
2250
2251         if (rc)
2252                 dev_warn(&h->pdev->dev, "giving up on device.\n");
2253         else
2254                 dev_warn(&h->pdev->dev, "device is ready.\n");
2255
2256         cmd_special_free(h, c);
2257         return rc;
2258 }
2259
2260 /* Need at least one of these error handlers to keep ../scsi/hosts.c from
2261  * complaining.  Doing a host- or bus-reset can't do anything good here.
2262  */
2263 static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
2264 {
2265         int rc;
2266         struct ctlr_info *h;
2267         struct hpsa_scsi_dev_t *dev;
2268
2269         /* find the controller to which the command to be aborted was sent */
2270         h = sdev_to_hba(scsicmd->device);
2271         if (h == NULL) /* paranoia */
2272                 return FAILED;
2273         dev = scsicmd->device->hostdata;
2274         if (!dev) {
2275                 dev_err(&h->pdev->dev, "hpsa_eh_device_reset_handler: "
2276                         "device lookup failed.\n");
2277                 return FAILED;
2278         }
2279         dev_warn(&h->pdev->dev, "resetting device %d:%d:%d:%d\n",
2280                 h->scsi_host->host_no, dev->bus, dev->target, dev->lun);
2281         /* send a reset to the SCSI LUN which the command was sent to */
2282         rc = hpsa_send_reset(h, dev->scsi3addr);
2283         if (rc == 0 && wait_for_device_to_become_ready(h, dev->scsi3addr) == 0)
2284                 return SUCCESS;
2285
2286         dev_warn(&h->pdev->dev, "resetting device failed.\n");
2287         return FAILED;
2288 }
2289
2290 /*
2291  * For operations that cannot sleep, a command block is allocated at init,
2292  * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
2293  * which ones are free or in use.  Lock must be held when calling this.
2294  * cmd_free() is the complement.
2295  */
2296 static struct CommandList *cmd_alloc(struct ctlr_info *h)
2297 {
2298         struct CommandList *c;
2299         int i;
2300         union u64bit temp64;
2301         dma_addr_t cmd_dma_handle, err_dma_handle;
2302
2303         do {
2304                 i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
2305                 if (i == h->nr_cmds)
2306                         return NULL;
2307         } while (test_and_set_bit
2308                  (i & (BITS_PER_LONG - 1),
2309                   h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
2310         c = h->cmd_pool + i;
2311         memset(c, 0, sizeof(*c));
2312         cmd_dma_handle = h->cmd_pool_dhandle
2313             + i * sizeof(*c);
2314         c->err_info = h->errinfo_pool + i;
2315         memset(c->err_info, 0, sizeof(*c->err_info));
2316         err_dma_handle = h->errinfo_pool_dhandle
2317             + i * sizeof(*c->err_info);
2318         h->nr_allocs++;
2319
2320         c->cmdindex = i;
2321
2322         INIT_LIST_HEAD(&c->list);
2323         c->busaddr = (u32) cmd_dma_handle;
2324         temp64.val = (u64) err_dma_handle;
2325         c->ErrDesc.Addr.lower = temp64.val32.lower;
2326         c->ErrDesc.Addr.upper = temp64.val32.upper;
2327         c->ErrDesc.Len = sizeof(*c->err_info);
2328
2329         c->h = h;
2330         return c;
2331 }
2332
2333 /* For operations that can wait for kmalloc to possibly sleep,
2334  * this routine can be called. Lock need not be held to call
2335  * cmd_special_alloc. cmd_special_free() is the complement.
2336  */
2337 static struct CommandList *cmd_special_alloc(struct ctlr_info *h)
2338 {
2339         struct CommandList *c;
2340         union u64bit temp64;
2341         dma_addr_t cmd_dma_handle, err_dma_handle;
2342
2343         c = pci_alloc_consistent(h->pdev, sizeof(*c), &cmd_dma_handle);
2344         if (c == NULL)
2345                 return NULL;
2346         memset(c, 0, sizeof(*c));
2347
2348         c->cmdindex = -1;
2349
2350         c->err_info = pci_alloc_consistent(h->pdev, sizeof(*c->err_info),
2351                     &err_dma_handle);
2352
2353         if (c->err_info == NULL) {
2354                 pci_free_consistent(h->pdev,
2355                         sizeof(*c), c, cmd_dma_handle);
2356                 return NULL;
2357         }
2358         memset(c->err_info, 0, sizeof(*c->err_info));
2359
2360         INIT_LIST_HEAD(&c->list);
2361         c->busaddr = (u32) cmd_dma_handle;
2362         temp64.val = (u64) err_dma_handle;
2363         c->ErrDesc.Addr.lower = temp64.val32.lower;
2364         c->ErrDesc.Addr.upper = temp64.val32.upper;
2365         c->ErrDesc.Len = sizeof(*c->err_info);
2366
2367         c->h = h;
2368         return c;
2369 }
2370
2371 static void cmd_free(struct ctlr_info *h, struct CommandList *c)
2372 {
2373         int i;
2374
2375         i = c - h->cmd_pool;
2376         clear_bit(i & (BITS_PER_LONG - 1),
2377                   h->cmd_pool_bits + (i / BITS_PER_LONG));
2378         h->nr_frees++;
2379 }
2380
2381 static void cmd_special_free(struct ctlr_info *h, struct CommandList *c)
2382 {
2383         union u64bit temp64;
2384
2385         temp64.val32.lower = c->ErrDesc.Addr.lower;
2386         temp64.val32.upper = c->ErrDesc.Addr.upper;
2387         pci_free_consistent(h->pdev, sizeof(*c->err_info),
2388                             c->err_info, (dma_addr_t) temp64.val);
2389         pci_free_consistent(h->pdev, sizeof(*c),
2390                             c, (dma_addr_t) (c->busaddr & DIRECT_LOOKUP_MASK));
2391 }
2392
2393 #ifdef CONFIG_COMPAT
2394
2395 static int hpsa_ioctl32_passthru(struct scsi_device *dev, int cmd, void *arg)
2396 {
2397         IOCTL32_Command_struct __user *arg32 =
2398             (IOCTL32_Command_struct __user *) arg;
2399         IOCTL_Command_struct arg64;
2400         IOCTL_Command_struct __user *p = compat_alloc_user_space(sizeof(arg64));
2401         int err;
2402         u32 cp;
2403
2404         memset(&arg64, 0, sizeof(arg64));
2405         err = 0;
2406         err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
2407                            sizeof(arg64.LUN_info));
2408         err |= copy_from_user(&arg64.Request, &arg32->Request,
2409                            sizeof(arg64.Request));
2410         err |= copy_from_user(&arg64.error_info, &arg32->error_info,
2411                            sizeof(arg64.error_info));
2412         err |= get_user(arg64.buf_size, &arg32->buf_size);
2413         err |= get_user(cp, &arg32->buf);
2414         arg64.buf = compat_ptr(cp);
2415         err |= copy_to_user(p, &arg64, sizeof(arg64));
2416
2417         if (err)
2418                 return -EFAULT;
2419
2420         err = hpsa_ioctl(dev, CCISS_PASSTHRU, (void *)p);
2421         if (err)
2422                 return err;
2423         err |= copy_in_user(&arg32->error_info, &p->error_info,
2424                          sizeof(arg32->error_info));
2425         if (err)
2426                 return -EFAULT;
2427         return err;
2428 }
2429
2430 static int hpsa_ioctl32_big_passthru(struct scsi_device *dev,
2431         int cmd, void *arg)
2432 {
2433         BIG_IOCTL32_Command_struct __user *arg32 =
2434             (BIG_IOCTL32_Command_struct __user *) arg;
2435         BIG_IOCTL_Command_struct arg64;
2436         BIG_IOCTL_Command_struct __user *p =
2437             compat_alloc_user_space(sizeof(arg64));
2438         int err;
2439         u32 cp;
2440
2441         memset(&arg64, 0, sizeof(arg64));
2442         err = 0;
2443         err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
2444                            sizeof(arg64.LUN_info));
2445         err |= copy_from_user(&arg64.Request, &arg32->Request,
2446                            sizeof(arg64.Request));
2447         err |= copy_from_user(&arg64.error_info, &arg32->error_info,
2448                            sizeof(arg64.error_info));
2449         err |= get_user(arg64.buf_size, &arg32->buf_size);
2450         err |= get_user(arg64.malloc_size, &arg32->malloc_size);
2451         err |= get_user(cp, &arg32->buf);
2452         arg64.buf = compat_ptr(cp);
2453         err |= copy_to_user(p, &arg64, sizeof(arg64));
2454
2455         if (err)
2456                 return -EFAULT;
2457
2458         err = hpsa_ioctl(dev, CCISS_BIG_PASSTHRU, (void *)p);
2459         if (err)
2460                 return err;
2461         err |= copy_in_user(&arg32->error_info, &p->error_info,
2462                          sizeof(arg32->error_info));
2463         if (err)
2464                 return -EFAULT;
2465         return err;
2466 }
2467
2468 static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void *arg)
2469 {
2470         switch (cmd) {
2471         case CCISS_GETPCIINFO:
2472         case CCISS_GETINTINFO:
2473         case CCISS_SETINTINFO:
2474         case CCISS_GETNODENAME:
2475         case CCISS_SETNODENAME:
2476         case CCISS_GETHEARTBEAT:
2477         case CCISS_GETBUSTYPES:
2478         case CCISS_GETFIRMVER:
2479         case CCISS_GETDRIVVER:
2480         case CCISS_REVALIDVOLS:
2481         case CCISS_DEREGDISK:
2482         case CCISS_REGNEWDISK:
2483         case CCISS_REGNEWD:
2484         case CCISS_RESCANDISK:
2485         case CCISS_GETLUNINFO:
2486                 return hpsa_ioctl(dev, cmd, arg);
2487
2488         case CCISS_PASSTHRU32:
2489                 return hpsa_ioctl32_passthru(dev, cmd, arg);
2490         case CCISS_BIG_PASSTHRU32:
2491                 return hpsa_ioctl32_big_passthru(dev, cmd, arg);
2492
2493         default:
2494                 return -ENOIOCTLCMD;
2495         }
2496 }
2497 #endif
2498
2499 static int hpsa_getpciinfo_ioctl(struct ctlr_info *h, void __user *argp)
2500 {
2501         struct hpsa_pci_info pciinfo;
2502
2503         if (!argp)
2504                 return -EINVAL;
2505         pciinfo.domain = pci_domain_nr(h->pdev->bus);
2506         pciinfo.bus = h->pdev->bus->number;
2507         pciinfo.dev_fn = h->pdev->devfn;
2508         pciinfo.board_id = h->board_id;
2509         if (copy_to_user(argp, &pciinfo, sizeof(pciinfo)))
2510                 return -EFAULT;
2511         return 0;
2512 }
2513
2514 static int hpsa_getdrivver_ioctl(struct ctlr_info *h, void __user *argp)
2515 {
2516         DriverVer_type DriverVer;
2517         unsigned char vmaj, vmin, vsubmin;
2518         int rc;
2519
2520         rc = sscanf(HPSA_DRIVER_VERSION, "%hhu.%hhu.%hhu",
2521                 &vmaj, &vmin, &vsubmin);
2522         if (rc != 3) {
2523                 dev_info(&h->pdev->dev, "driver version string '%s' "
2524                         "unrecognized.", HPSA_DRIVER_VERSION);
2525                 vmaj = 0;
2526                 vmin = 0;
2527                 vsubmin = 0;
2528         }
2529         DriverVer = (vmaj << 16) | (vmin << 8) | vsubmin;
2530         if (!argp)
2531                 return -EINVAL;
2532         if (copy_to_user(argp, &DriverVer, sizeof(DriverVer_type)))
2533                 return -EFAULT;
2534         return 0;
2535 }
2536
2537 static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
2538 {
2539         IOCTL_Command_struct iocommand;
2540         struct CommandList *c;
2541         char *buff = NULL;
2542         union u64bit temp64;
2543
2544         if (!argp)
2545                 return -EINVAL;
2546         if (!capable(CAP_SYS_RAWIO))
2547                 return -EPERM;
2548         if (copy_from_user(&iocommand, argp, sizeof(iocommand)))
2549                 return -EFAULT;
2550         if ((iocommand.buf_size < 1) &&
2551             (iocommand.Request.Type.Direction != XFER_NONE)) {
2552                 return -EINVAL;
2553         }
2554         if (iocommand.buf_size > 0) {
2555                 buff = kmalloc(iocommand.buf_size, GFP_KERNEL);
2556                 if (buff == NULL)
2557                         return -EFAULT;
2558                 if (iocommand.Request.Type.Direction == XFER_WRITE) {
2559                         /* Copy the data into the buffer we created */
2560                         if (copy_from_user(buff, iocommand.buf,
2561                                 iocommand.buf_size)) {
2562                                 kfree(buff);
2563                                 return -EFAULT;
2564                         }
2565                 } else {
2566                         memset(buff, 0, iocommand.buf_size);
2567                 }
2568         }
2569         c = cmd_special_alloc(h);
2570         if (c == NULL) {
2571                 kfree(buff);
2572                 return -ENOMEM;
2573         }
2574         /* Fill in the command type */
2575         c->cmd_type = CMD_IOCTL_PEND;
2576         /* Fill in Command Header */
2577         c->Header.ReplyQueue = 0; /* unused in simple mode */
2578         if (iocommand.buf_size > 0) {   /* buffer to fill */
2579                 c->Header.SGList = 1;
2580                 c->Header.SGTotal = 1;
2581         } else  { /* no buffers to fill */
2582                 c->Header.SGList = 0;
2583                 c->Header.SGTotal = 0;
2584         }
2585         memcpy(&c->Header.LUN, &iocommand.LUN_info, sizeof(c->Header.LUN));
2586         /* use the kernel address the cmd block for tag */
2587         c->Header.Tag.lower = c->busaddr;
2588
2589         /* Fill in Request block */
2590         memcpy(&c->Request, &iocommand.Request,
2591                 sizeof(c->Request));
2592
2593         /* Fill in the scatter gather information */
2594         if (iocommand.buf_size > 0) {
2595                 temp64.val = pci_map_single(h->pdev, buff,
2596                         iocommand.buf_size, PCI_DMA_BIDIRECTIONAL);
2597                 c->SG[0].Addr.lower = temp64.val32.lower;
2598                 c->SG[0].Addr.upper = temp64.val32.upper;
2599                 c->SG[0].Len = iocommand.buf_size;
2600                 c->SG[0].Ext = 0; /* we are not chaining*/
2601         }
2602         hpsa_scsi_do_simple_cmd_core(h, c);
2603         if (iocommand.buf_size > 0)
2604                 hpsa_pci_unmap(h->pdev, c, 1, PCI_DMA_BIDIRECTIONAL);
2605         check_ioctl_unit_attention(h, c);
2606
2607         /* Copy the error information out */
2608         memcpy(&iocommand.error_info, c->err_info,
2609                 sizeof(iocommand.error_info));
2610         if (copy_to_user(argp, &iocommand, sizeof(iocommand))) {
2611                 kfree(buff);
2612                 cmd_special_free(h, c);
2613                 return -EFAULT;
2614         }
2615         if (iocommand.Request.Type.Direction == XFER_READ &&
2616                 iocommand.buf_size > 0) {
2617                 /* Copy the data out of the buffer we created */
2618                 if (copy_to_user(iocommand.buf, buff, iocommand.buf_size)) {
2619                         kfree(buff);
2620                         cmd_special_free(h, c);
2621                         return -EFAULT;
2622                 }
2623         }
2624         kfree(buff);
2625         cmd_special_free(h, c);
2626         return 0;
2627 }
2628
2629 static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
2630 {
2631         BIG_IOCTL_Command_struct *ioc;
2632         struct CommandList *c;
2633         unsigned char **buff = NULL;
2634         int *buff_size = NULL;
2635         union u64bit temp64;
2636         BYTE sg_used = 0;
2637         int status = 0;
2638         int i;
2639         u32 left;
2640         u32 sz;
2641         BYTE __user *data_ptr;
2642
2643         if (!argp)
2644                 return -EINVAL;
2645         if (!capable(CAP_SYS_RAWIO))
2646                 return -EPERM;
2647         ioc = (BIG_IOCTL_Command_struct *)
2648             kmalloc(sizeof(*ioc), GFP_KERNEL);
2649         if (!ioc) {
2650                 status = -ENOMEM;
2651                 goto cleanup1;
2652         }
2653         if (copy_from_user(ioc, argp, sizeof(*ioc))) {
2654                 status = -EFAULT;
2655                 goto cleanup1;
2656         }
2657         if ((ioc->buf_size < 1) &&
2658             (ioc->Request.Type.Direction != XFER_NONE)) {
2659                 status = -EINVAL;
2660                 goto cleanup1;
2661         }
2662         /* Check kmalloc limits  using all SGs */
2663         if (ioc->malloc_size > MAX_KMALLOC_SIZE) {
2664                 status = -EINVAL;
2665                 goto cleanup1;
2666         }
2667         if (ioc->buf_size > ioc->malloc_size * MAXSGENTRIES) {
2668                 status = -EINVAL;
2669                 goto cleanup1;
2670         }
2671         buff = kzalloc(MAXSGENTRIES * sizeof(char *), GFP_KERNEL);
2672         if (!buff) {
2673                 status = -ENOMEM;
2674                 goto cleanup1;
2675         }
2676         buff_size = kmalloc(MAXSGENTRIES * sizeof(int), GFP_KERNEL);
2677         if (!buff_size) {
2678                 status = -ENOMEM;
2679                 goto cleanup1;
2680         }
2681         left = ioc->buf_size;
2682         data_ptr = ioc->buf;
2683         while (left) {
2684                 sz = (left > ioc->malloc_size) ? ioc->malloc_size : left;
2685                 buff_size[sg_used] = sz;
2686                 buff[sg_used] = kmalloc(sz, GFP_KERNEL);
2687                 if (buff[sg_used] == NULL) {
2688                         status = -ENOMEM;
2689                         goto cleanup1;
2690                 }
2691                 if (ioc->Request.Type.Direction == XFER_WRITE) {
2692                         if (copy_from_user(buff[sg_used], data_ptr, sz)) {
2693                                 status = -ENOMEM;
2694                                 goto cleanup1;
2695                         }
2696                 } else
2697                         memset(buff[sg_used], 0, sz);
2698                 left -= sz;
2699                 data_ptr += sz;
2700                 sg_used++;
2701         }
2702         c = cmd_special_alloc(h);
2703         if (c == NULL) {
2704                 status = -ENOMEM;
2705                 goto cleanup1;
2706         }
2707         c->cmd_type = CMD_IOCTL_PEND;
2708         c->Header.ReplyQueue = 0;
2709         c->Header.SGList = c->Header.SGTotal = sg_used;
2710         memcpy(&c->Header.LUN, &ioc->LUN_info, sizeof(c->Header.LUN));
2711         c->Header.Tag.lower = c->busaddr;
2712         memcpy(&c->Request, &ioc->Request, sizeof(c->Request));
2713         if (ioc->buf_size > 0) {
2714                 int i;
2715                 for (i = 0; i < sg_used; i++) {
2716                         temp64.val = pci_map_single(h->pdev, buff[i],
2717                                     buff_size[i], PCI_DMA_BIDIRECTIONAL);
2718                         c->SG[i].Addr.lower = temp64.val32.lower;
2719                         c->SG[i].Addr.upper = temp64.val32.upper;
2720                         c->SG[i].Len = buff_size[i];
2721                         /* we are not chaining */
2722                         c->SG[i].Ext = 0;
2723                 }
2724         }
2725         hpsa_scsi_do_simple_cmd_core(h, c);
2726         if (sg_used)
2727                 hpsa_pci_unmap(h->pdev, c, sg_used, PCI_DMA_BIDIRECTIONAL);
2728         check_ioctl_unit_attention(h, c);
2729         /* Copy the error information out */
2730         memcpy(&ioc->error_info, c->err_info, sizeof(ioc->error_info));
2731         if (copy_to_user(argp, ioc, sizeof(*ioc))) {
2732                 cmd_special_free(h, c);
2733                 status = -EFAULT;
2734                 goto cleanup1;
2735         }
2736         if (ioc->Request.Type.Direction == XFER_READ && ioc->buf_size > 0) {
2737                 /* Copy the data out of the buffer we created */
2738                 BYTE __user *ptr = ioc->buf;
2739                 for (i = 0; i < sg_used; i++) {
2740                         if (copy_to_user(ptr, buff[i], buff_size[i])) {
2741                                 cmd_special_free(h, c);
2742                                 status = -EFAULT;
2743                                 goto cleanup1;
2744                         }
2745                         ptr += buff_size[i];
2746                 }
2747         }
2748         cmd_special_free(h, c);
2749         status = 0;
2750 cleanup1:
2751         if (buff) {
2752                 for (i = 0; i < sg_used; i++)
2753                         kfree(buff[i]);
2754                 kfree(buff);
2755         }
2756         kfree(buff_size);
2757         kfree(ioc);
2758         return status;
2759 }
2760
2761 static void check_ioctl_unit_attention(struct ctlr_info *h,
2762         struct CommandList *c)
2763 {
2764         if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
2765                         c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
2766                 (void) check_for_unit_attention(h, c);
2767 }
2768 /*
2769  * ioctl
2770  */
2771 static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg)
2772 {
2773         struct ctlr_info *h;
2774         void __user *argp = (void __user *)arg;
2775
2776         h = sdev_to_hba(dev);
2777
2778         switch (cmd) {
2779         case CCISS_DEREGDISK:
2780         case CCISS_REGNEWDISK:
2781         case CCISS_REGNEWD:
2782                 hpsa_scan_start(h->scsi_host);
2783                 return 0;
2784         case CCISS_GETPCIINFO:
2785                 return hpsa_getpciinfo_ioctl(h, argp);
2786         case CCISS_GETDRIVVER:
2787                 return hpsa_getdrivver_ioctl(h, argp);
2788         case CCISS_PASSTHRU:
2789                 return hpsa_passthru_ioctl(h, argp);
2790         case CCISS_BIG_PASSTHRU:
2791                 return hpsa_big_passthru_ioctl(h, argp);
2792         default:
2793                 return -ENOTTY;
2794         }
2795 }
2796
2797 static int __devinit hpsa_send_host_reset(struct ctlr_info *h,
2798         unsigned char *scsi3addr, u8 reset_type)
2799 {
2800         struct CommandList *c;
2801
2802         c = cmd_alloc(h);
2803         if (!c)
2804                 return -ENOMEM;
2805         fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0,
2806                 RAID_CTLR_LUNID, TYPE_MSG);
2807         c->Request.CDB[1] = reset_type; /* fill_cmd defaults to target reset */
2808         c->waiting = NULL;
2809         enqueue_cmd_and_start_io(h, c);
2810         /* Don't wait for completion, the reset won't complete.  Don't free
2811          * the command either.  This is the last command we will send before
2812          * re-initializing everything, so it doesn't matter and won't leak.
2813          */
2814         return 0;
2815 }
2816
2817 static void fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
2818         void *buff, size_t size, u8 page_code, unsigned char *scsi3addr,
2819         int cmd_type)
2820 {
2821         int pci_dir = XFER_NONE;
2822
2823         c->cmd_type = CMD_IOCTL_PEND;
2824         c->Header.ReplyQueue = 0;
2825         if (buff != NULL && size > 0) {
2826                 c->Header.SGList = 1;
2827                 c->Header.SGTotal = 1;
2828         } else {
2829                 c->Header.SGList = 0;
2830                 c->Header.SGTotal = 0;
2831         }
2832         c->Header.Tag.lower = c->busaddr;
2833         memcpy(c->Header.LUN.LunAddrBytes, scsi3addr, 8);
2834
2835         c->Request.Type.Type = cmd_type;
2836         if (cmd_type == TYPE_CMD) {
2837                 switch (cmd) {
2838                 case HPSA_INQUIRY:
2839                         /* are we trying to read a vital product page */
2840                         if (page_code != 0) {
2841                                 c->Request.CDB[1] = 0x01;
2842                                 c->Request.CDB[2] = page_code;
2843                         }
2844                         c->Request.CDBLen = 6;
2845                         c->Request.Type.Attribute = ATTR_SIMPLE;
2846                         c->Request.Type.Direction = XFER_READ;
2847                         c->Request.Timeout = 0;
2848                         c->Request.CDB[0] = HPSA_INQUIRY;
2849                         c->Request.CDB[4] = size & 0xFF;
2850                         break;
2851                 case HPSA_REPORT_LOG:
2852                 case HPSA_REPORT_PHYS:
2853                         /* Talking to controller so It's a physical command
2854                            mode = 00 target = 0.  Nothing to write.
2855                          */
2856                         c->Request.CDBLen = 12;
2857                         c->Request.Type.Attribute = ATTR_SIMPLE;
2858                         c->Request.Type.Direction = XFER_READ;
2859                         c->Request.Timeout = 0;
2860                         c->Request.CDB[0] = cmd;
2861                         c->Request.CDB[6] = (size >> 24) & 0xFF; /* MSB */
2862                         c->Request.CDB[7] = (size >> 16) & 0xFF;
2863                         c->Request.CDB[8] = (size >> 8) & 0xFF;
2864                         c->Request.CDB[9] = size & 0xFF;
2865                         break;
2866                 case HPSA_CACHE_FLUSH:
2867                         c->Request.CDBLen = 12;
2868                         c->Request.Type.Attribute = ATTR_SIMPLE;
2869                         c->Request.Type.Direction = XFER_WRITE;
2870                         c->Request.Timeout = 0;
2871                         c->Request.CDB[0] = BMIC_WRITE;
2872                         c->Request.CDB[6] = BMIC_CACHE_FLUSH;
2873                         break;
2874                 case TEST_UNIT_READY:
2875                         c->Request.CDBLen = 6;
2876                         c->Request.Type.Attribute = ATTR_SIMPLE;
2877                         c->Request.Type.Direction = XFER_NONE;
2878                         c->Request.Timeout = 0;
2879                         break;
2880                 default:
2881                         dev_warn(&h->pdev->dev, "unknown command 0x%c\n", cmd);
2882                         BUG();
2883                         return;
2884                 }
2885         } else if (cmd_type == TYPE_MSG) {
2886                 switch (cmd) {
2887
2888                 case  HPSA_DEVICE_RESET_MSG:
2889                         c->Request.CDBLen = 16;
2890                         c->Request.Type.Type =  1; /* It is a MSG not a CMD */
2891                         c->Request.Type.Attribute = ATTR_SIMPLE;
2892                         c->Request.Type.Direction = XFER_NONE;
2893                         c->Request.Timeout = 0; /* Don't time out */
2894                         memset(&c->Request.CDB[0], 0, sizeof(c->Request.CDB));
2895                         c->Request.CDB[0] =  cmd;
2896                         c->Request.CDB[1] = HPSA_RESET_TYPE_LUN;
2897                         /* If bytes 4-7 are zero, it means reset the */
2898                         /* LunID device */
2899                         c->Request.CDB[4] = 0x00;
2900                         c->Request.CDB[5] = 0x00;
2901                         c->Request.CDB[6] = 0x00;
2902                         c->Request.CDB[7] = 0x00;
2903                 break;
2904
2905                 default:
2906                         dev_warn(&h->pdev->dev, "unknown message type %d\n",
2907                                 cmd);
2908                         BUG();
2909                 }
2910         } else {
2911                 dev_warn(&h->pdev->dev, "unknown command type %d\n", cmd_type);
2912                 BUG();
2913         }
2914
2915         switch (c->Request.Type.Direction) {
2916         case XFER_READ:
2917                 pci_dir = PCI_DMA_FROMDEVICE;
2918                 break;
2919         case XFER_WRITE:
2920                 pci_dir = PCI_DMA_TODEVICE;
2921                 break;
2922         case XFER_NONE:
2923                 pci_dir = PCI_DMA_NONE;
2924                 break;
2925         default:
2926                 pci_dir = PCI_DMA_BIDIRECTIONAL;
2927         }
2928
2929         hpsa_map_one(h->pdev, c, buff, size, pci_dir);
2930
2931         return;
2932 }
2933
2934 /*
2935  * Map (physical) PCI mem into (virtual) kernel space
2936  */
2937 static void __iomem *remap_pci_mem(ulong base, ulong size)
2938 {
2939         ulong page_base = ((ulong) base) & PAGE_MASK;
2940         ulong page_offs = ((ulong) base) - page_base;
2941         void __iomem *page_remapped = ioremap(page_base, page_offs + size);
2942
2943         return page_remapped ? (page_remapped + page_offs) : NULL;
2944 }
2945
2946 /* Takes cmds off the submission queue and sends them to the hardware,
2947  * then puts them on the queue of cmds waiting for completion.
2948  */
2949 static void start_io(struct ctlr_info *h)
2950 {
2951         struct CommandList *c;
2952
2953         while (!list_empty(&h->reqQ)) {
2954                 c = list_entry(h->reqQ.next, struct CommandList, list);
2955                 /* can't do anything if fifo is full */
2956                 if ((h->access.fifo_full(h))) {
2957                         dev_warn(&h->pdev->dev, "fifo full\n");
2958                         break;
2959                 }
2960
2961                 /* Get the first entry from the Request Q */
2962                 removeQ(c);
2963                 h->Qdepth--;
2964
2965                 /* Tell the controller execute command */
2966                 h->access.submit_command(h, c);
2967
2968                 /* Put job onto the completed Q */
2969                 addQ(&h->cmpQ, c);
2970         }
2971 }
2972
2973 static inline unsigned long get_next_completion(struct ctlr_info *h)
2974 {
2975         return h->access.command_completed(h);
2976 }
2977
2978 static inline bool interrupt_pending(struct ctlr_info *h)
2979 {
2980         return h->access.intr_pending(h);
2981 }
2982
2983 static inline long interrupt_not_for_us(struct ctlr_info *h)
2984 {
2985         return (h->access.intr_pending(h) == 0) ||
2986                 (h->interrupts_enabled == 0);
2987 }
2988
2989 static inline int bad_tag(struct ctlr_info *h, u32 tag_index,
2990         u32 raw_tag)
2991 {
2992         if (unlikely(tag_index >= h->nr_cmds)) {
2993                 dev_warn(&h->pdev->dev, "bad tag 0x%08x ignored.\n", raw_tag);
2994                 return 1;
2995         }
2996         return 0;
2997 }
2998
2999 static inline void finish_cmd(struct CommandList *c, u32 raw_tag)
3000 {
3001         removeQ(c);
3002         if (likely(c->cmd_type == CMD_SCSI))
3003                 complete_scsi_command(c);
3004         else if (c->cmd_type == CMD_IOCTL_PEND)
3005                 complete(c->waiting);
3006 }
3007
3008 static inline u32 hpsa_tag_contains_index(u32 tag)
3009 {
3010         return tag & DIRECT_LOOKUP_BIT;
3011 }
3012
3013 static inline u32 hpsa_tag_to_index(u32 tag)
3014 {
3015         return tag >> DIRECT_LOOKUP_SHIFT;
3016 }
3017
3018
3019 static inline u32 hpsa_tag_discard_error_bits(struct ctlr_info *h, u32 tag)
3020 {
3021 #define HPSA_PERF_ERROR_BITS ((1 << DIRECT_LOOKUP_SHIFT) - 1)
3022 #define HPSA_SIMPLE_ERROR_BITS 0x03
3023         if (unlikely(!(h->transMethod & CFGTBL_Trans_Performant)))
3024                 return tag & ~HPSA_SIMPLE_ERROR_BITS;
3025         return tag & ~HPSA_PERF_ERROR_BITS;
3026 }
3027
3028 /* process completion of an indexed ("direct lookup") command */
3029 static inline u32 process_indexed_cmd(struct ctlr_info *h,
3030         u32 raw_tag)
3031 {
3032         u32 tag_index;
3033         struct CommandList *c;
3034
3035         tag_index = hpsa_tag_to_index(raw_tag);
3036         if (bad_tag(h, tag_index, raw_tag))
3037                 return next_command(h);
3038         c = h->cmd_pool + tag_index;
3039         finish_cmd(c, raw_tag);
3040         return next_command(h);
3041 }
3042
3043 /* process completion of a non-indexed command */
3044 static inline u32 process_nonindexed_cmd(struct ctlr_info *h,
3045         u32 raw_tag)
3046 {
3047         u32 tag;
3048         struct CommandList *c = NULL;
3049
3050         tag = hpsa_tag_discard_error_bits(h, raw_tag);
3051         list_for_each_entry(c, &h->cmpQ, list) {
3052                 if ((c->busaddr & 0xFFFFFFE0) == (tag & 0xFFFFFFE0)) {
3053                         finish_cmd(c, raw_tag);
3054                         return next_command(h);
3055                 }
3056         }
3057         bad_tag(h, h->nr_cmds + 1, raw_tag);
3058         return next_command(h);
3059 }
3060
3061 /* Some controllers, like p400, will give us one interrupt
3062  * after a soft reset, even if we turned interrupts off.
3063  * Only need to check for this in the hpsa_xxx_discard_completions
3064  * functions.
3065  */
3066 static int ignore_bogus_interrupt(struct ctlr_info *h)
3067 {
3068         if (likely(!reset_devices))
3069                 return 0;
3070
3071         if (likely(h->interrupts_enabled))
3072                 return 0;
3073
3074         dev_info(&h->pdev->dev, "Received interrupt while interrupts disabled "
3075                 "(known firmware bug.)  Ignoring.\n");
3076
3077         return 1;
3078 }
3079
3080 static irqreturn_t hpsa_intx_discard_completions(int irq, void *dev_id)
3081 {
3082         struct ctlr_info *h = dev_id;
3083         unsigned long flags;
3084         u32 raw_tag;
3085
3086         if (ignore_bogus_interrupt(h))
3087                 return IRQ_NONE;
3088
3089         if (interrupt_not_for_us(h))
3090                 return IRQ_NONE;
3091         spin_lock_irqsave(&h->lock, flags);
3092         while (interrupt_pending(h)) {
3093                 raw_tag = get_next_completion(h);
3094                 while (raw_tag != FIFO_EMPTY)
3095                         raw_tag = next_command(h);
3096         }
3097         spin_unlock_irqrestore(&h->lock, flags);
3098         return IRQ_HANDLED;
3099 }
3100
3101 static irqreturn_t hpsa_msix_discard_completions(int irq, void *dev_id)
3102 {
3103         struct ctlr_info *h = dev_id;
3104         unsigned long flags;
3105         u32 raw_tag;
3106
3107         if (ignore_bogus_interrupt(h))
3108                 return IRQ_NONE;
3109
3110         spin_lock_irqsave(&h->lock, flags);
3111         raw_tag = get_next_completion(h);
3112         while (raw_tag != FIFO_EMPTY)
3113                 raw_tag = next_command(h);
3114         spin_unlock_irqrestore(&h->lock, flags);
3115         return IRQ_HANDLED;
3116 }
3117
3118 static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id)
3119 {
3120         struct ctlr_info *h = dev_id;
3121         unsigned long flags;
3122         u32 raw_tag;
3123
3124         if (interrupt_not_for_us(h))
3125                 return IRQ_NONE;
3126         spin_lock_irqsave(&h->lock, flags);
3127         while (interrupt_pending(h)) {
3128                 raw_tag = get_next_completion(h);
3129                 while (raw_tag != FIFO_EMPTY) {
3130                         if (hpsa_tag_contains_index(raw_tag))
3131                                 raw_tag = process_indexed_cmd(h, raw_tag);
3132                         else
3133                                 raw_tag = process_nonindexed_cmd(h, raw_tag);
3134                 }
3135         }
3136         spin_unlock_irqrestore(&h->lock, flags);
3137         return IRQ_HANDLED;
3138 }
3139
3140 static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id)
3141 {
3142         struct ctlr_info *h = dev_id;
3143         unsigned long flags;
3144         u32 raw_tag;
3145
3146         spin_lock_irqsave(&h->lock, flags);
3147         raw_tag = get_next_completion(h);
3148         while (raw_tag != FIFO_EMPTY) {
3149                 if (hpsa_tag_contains_index(raw_tag))
3150                         raw_tag = process_indexed_cmd(h, raw_tag);
3151                 else
3152                         raw_tag = process_nonindexed_cmd(h, raw_tag);
3153         }
3154         spin_unlock_irqrestore(&h->lock, flags);
3155         return IRQ_HANDLED;
3156 }
3157
3158 /* Send a message CDB to the firmware. Careful, this only works
3159  * in simple mode, not performant mode due to the tag lookup.
3160  * We only ever use this immediately after a controller reset.
3161  */
3162 static __devinit int hpsa_message(struct pci_dev *pdev, unsigned char opcode,
3163                                                 unsigned char type)
3164 {
3165         struct Command {
3166                 struct CommandListHeader CommandHeader;
3167                 struct RequestBlock Request;
3168                 struct ErrDescriptor ErrorDescriptor;
3169         };
3170         struct Command *cmd;
3171         static const size_t cmd_sz = sizeof(*cmd) +
3172                                         sizeof(cmd->ErrorDescriptor);
3173         dma_addr_t paddr64;
3174         uint32_t paddr32, tag;
3175         void __iomem *vaddr;
3176         int i, err;
3177
3178         vaddr = pci_ioremap_bar(pdev, 0);
3179         if (vaddr == NULL)
3180                 return -ENOMEM;
3181
3182         /* The Inbound Post Queue only accepts 32-bit physical addresses for the
3183          * CCISS commands, so they must be allocated from the lower 4GiB of
3184          * memory.
3185          */
3186         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
3187         if (err) {
3188                 iounmap(vaddr);
3189                 return -ENOMEM;
3190         }
3191
3192         cmd = pci_alloc_consistent(pdev, cmd_sz, &paddr64);
3193         if (cmd == NULL) {
3194                 iounmap(vaddr);
3195                 return -ENOMEM;
3196         }
3197
3198         /* This must fit, because of the 32-bit consistent DMA mask.  Also,
3199          * although there's no guarantee, we assume that the address is at
3200          * least 4-byte aligned (most likely, it's page-aligned).
3201          */
3202         paddr32 = paddr64;
3203
3204         cmd->CommandHeader.ReplyQueue = 0;
3205         cmd->CommandHeader.SGList = 0;
3206         cmd->CommandHeader.SGTotal = 0;
3207         cmd->CommandHeader.Tag.lower = paddr32;
3208         cmd->CommandHeader.Tag.upper = 0;
3209         memset(&cmd->CommandHeader.LUN.LunAddrBytes, 0, 8);
3210
3211         cmd->Request.CDBLen = 16;
3212         cmd->Request.Type.Type = TYPE_MSG;
3213         cmd->Request.Type.Attribute = ATTR_HEADOFQUEUE;
3214         cmd->Request.Type.Direction = XFER_NONE;
3215         cmd->Request.Timeout = 0; /* Don't time out */
3216         cmd->Request.CDB[0] = opcode;
3217         cmd->Request.CDB[1] = type;
3218         memset(&cmd->Request.CDB[2], 0, 14); /* rest of the CDB is reserved */
3219         cmd->ErrorDescriptor.Addr.lower = paddr32 + sizeof(*cmd);
3220         cmd->ErrorDescriptor.Addr.upper = 0;
3221         cmd->ErrorDescriptor.Len = sizeof(struct ErrorInfo);
3222
3223         writel(paddr32, vaddr + SA5_REQUEST_PORT_OFFSET);
3224
3225         for (i = 0; i < HPSA_MSG_SEND_RETRY_LIMIT; i++) {
3226                 tag = readl(vaddr + SA5_REPLY_PORT_OFFSET);
3227                 if ((tag & ~HPSA_SIMPLE_ERROR_BITS) == paddr32)
3228                         break;
3229                 msleep(HPSA_MSG_SEND_RETRY_INTERVAL_MSECS);
3230         }
3231
3232         iounmap(vaddr);
3233
3234         /* we leak the DMA buffer here ... no choice since the controller could
3235          *  still complete the command.
3236          */
3237         if (i == HPSA_MSG_SEND_RETRY_LIMIT) {
3238                 dev_err(&pdev->dev, "controller message %02x:%02x timed out\n",
3239                         opcode, type);
3240                 return -ETIMEDOUT;
3241         }
3242
3243         pci_free_consistent(pdev, cmd_sz, cmd, paddr64);
3244
3245         if (tag & HPSA_ERROR_BIT) {
3246                 dev_err(&pdev->dev, "controller message %02x:%02x failed\n",
3247                         opcode, type);
3248                 return -EIO;
3249         }
3250
3251         dev_info(&pdev->dev, "controller message %02x:%02x succeeded\n",
3252                 opcode, type);
3253         return 0;
3254 }
3255
3256 #define hpsa_noop(p) hpsa_message(p, 3, 0)
3257
3258 static int hpsa_controller_hard_reset(struct pci_dev *pdev,
3259         void * __iomem vaddr, u32 use_doorbell)
3260 {
3261         u16 pmcsr;
3262         int pos;
3263
3264         if (use_doorbell) {
3265                 /* For everything after the P600, the PCI power state method
3266                  * of resetting the controller doesn't work, so we have this
3267                  * other way using the doorbell register.
3268                  */
3269                 dev_info(&pdev->dev, "using doorbell to reset controller\n");
3270                 writel(use_doorbell, vaddr + SA5_DOORBELL);
3271         } else { /* Try to do it the PCI power state way */
3272
3273                 /* Quoting from the Open CISS Specification: "The Power
3274                  * Management Control/Status Register (CSR) controls the power
3275                  * state of the device.  The normal operating state is D0,
3276                  * CSR=00h.  The software off state is D3, CSR=03h.  To reset
3277                  * the controller, place the interface device in D3 then to D0,
3278                  * this causes a secondary PCI reset which will reset the
3279                  * controller." */
3280
3281                 pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
3282                 if (pos == 0) {
3283                         dev_err(&pdev->dev,
3284                                 "hpsa_reset_controller: "
3285                                 "PCI PM not supported\n");
3286                         return -ENODEV;
3287                 }
3288                 dev_info(&pdev->dev, "using PCI PM to reset controller\n");
3289                 /* enter the D3hot power management state */
3290                 pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
3291                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
3292                 pmcsr |= PCI_D3hot;
3293                 pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
3294
3295                 msleep(500);
3296
3297                 /* enter the D0 power management state */
3298                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
3299                 pmcsr |= PCI_D0;
3300                 pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
3301
3302                 /*
3303                  * The P600 requires a small delay when changing states.
3304                  * Otherwise we may think the board did not reset and we bail.
3305                  * This for kdump only and is particular to the P600.
3306                  */
3307                 msleep(500);
3308         }
3309         return 0;
3310 }
3311
3312 static __devinit void init_driver_version(char *driver_version, int len)
3313 {
3314         memset(driver_version, 0, len);
3315         strncpy(driver_version, "hpsa " HPSA_DRIVER_VERSION, len - 1);
3316 }
3317
3318 static __devinit int write_driver_ver_to_cfgtable(
3319         struct CfgTable __iomem *cfgtable)
3320 {
3321         char *driver_version;
3322         int i, size = sizeof(cfgtable->driver_version);
3323
3324         driver_version = kmalloc(size, GFP_KERNEL);
3325         if (!driver_version)
3326                 return -ENOMEM;
3327
3328         init_driver_version(driver_version, size);
3329         for (i = 0; i < size; i++)
3330                 writeb(driver_version[i], &cfgtable->driver_version[i]);
3331         kfree(driver_version);
3332         return 0;
3333 }
3334
3335 static __devinit void read_driver_ver_from_cfgtable(
3336         struct CfgTable __iomem *cfgtable, unsigned char *driver_ver)
3337 {
3338         int i;
3339
3340         for (i = 0; i < sizeof(cfgtable->driver_version); i++)
3341                 driver_ver[i] = readb(&cfgtable->driver_version[i]);
3342 }
3343
3344 static __devinit int controller_reset_failed(
3345         struct CfgTable __iomem *cfgtable)
3346 {
3347
3348         char *driver_ver, *old_driver_ver;
3349         int rc, size = sizeof(cfgtable->driver_version);
3350
3351         old_driver_ver = kmalloc(2 * size, GFP_KERNEL);
3352         if (!old_driver_ver)
3353                 return -ENOMEM;
3354         driver_ver = old_driver_ver + size;
3355
3356         /* After a reset, the 32 bytes of "driver version" in the cfgtable
3357          * should have been changed, otherwise we know the reset failed.
3358          */
3359         init_driver_version(old_driver_ver, size);
3360         read_driver_ver_from_cfgtable(cfgtable, driver_ver);
3361         rc = !memcmp(driver_ver, old_driver_ver, size);
3362         kfree(old_driver_ver);
3363         return rc;
3364 }
3365 /* This does a hard reset of the controller using PCI power management
3366  * states or the using the doorbell register.
3367  */
3368 static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
3369 {
3370         u64 cfg_offset;
3371         u32 cfg_base_addr;
3372         u64 cfg_base_addr_index;
3373         void __iomem *vaddr;
3374         unsigned long paddr;
3375         u32 misc_fw_support;
3376         int rc;
3377         struct CfgTable __iomem *cfgtable;
3378         u32 use_doorbell;
3379         u32 board_id;
3380         u16 command_register;
3381
3382         /* For controllers as old as the P600, this is very nearly
3383          * the same thing as
3384          *
3385          * pci_save_state(pci_dev);
3386          * pci_set_power_state(pci_dev, PCI_D3hot);
3387          * pci_set_power_state(pci_dev, PCI_D0);
3388          * pci_restore_state(pci_dev);
3389          *
3390          * For controllers newer than the P600, the pci power state
3391          * method of resetting doesn't work so we have another way
3392          * using the doorbell register.
3393          */
3394
3395         rc = hpsa_lookup_board_id(pdev, &board_id);
3396         if (rc < 0 || !ctlr_is_resettable(board_id)) {
3397                 dev_warn(&pdev->dev, "Not resetting device.\n");
3398                 return -ENODEV;
3399         }
3400
3401         /* if controller is soft- but not hard resettable... */
3402         if (!ctlr_is_hard_resettable(board_id))
3403                 return -ENOTSUPP; /* try soft reset later. */
3404
3405         /* Save the PCI command register */
3406         pci_read_config_word(pdev, 4, &command_register);
3407         /* Turn the board off.  This is so that later pci_restore_state()
3408          * won't turn the board on before the rest of config space is ready.
3409          */
3410         pci_disable_device(pdev);
3411         pci_save_state(pdev);
3412
3413         /* find the first memory BAR, so we can find the cfg table */
3414         rc = hpsa_pci_find_memory_BAR(pdev, &paddr);
3415         if (rc)
3416                 return rc;
3417         vaddr = remap_pci_mem(paddr, 0x250);
3418         if (!vaddr)
3419                 return -ENOMEM;
3420
3421         /* find cfgtable in order to check if reset via doorbell is supported */
3422         rc = hpsa_find_cfg_addrs(pdev, vaddr, &cfg_base_addr,
3423                                         &cfg_base_addr_index, &cfg_offset);
3424         if (rc)
3425                 goto unmap_vaddr;
3426         cfgtable = remap_pci_mem(pci_resource_start(pdev,
3427                        cfg_base_addr_index) + cfg_offset, sizeof(*cfgtable));
3428         if (!cfgtable) {
3429                 rc = -ENOMEM;
3430                 goto unmap_vaddr;
3431         }
3432         rc = write_driver_ver_to_cfgtable(cfgtable);
3433         if (rc)
3434                 goto unmap_vaddr;
3435
3436         /* If reset via doorbell register is supported, use that.
3437          * There are two such methods.  Favor the newest method.
3438          */
3439         misc_fw_support = readl(&cfgtable->misc_fw_support);
3440         use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET2;
3441         if (use_doorbell) {
3442                 use_doorbell = DOORBELL_CTLR_RESET2;
3443         } else {
3444                 use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
3445                 if (use_doorbell) {
3446                         dev_warn(&pdev->dev, "Controller claims that "
3447                                 "'Bit 2 doorbell reset' is "
3448                                 "supported, but not 'bit 5 doorbell reset'.  "
3449                                 "Firmware update is recommended.\n");
3450                         rc = -ENOTSUPP; /* try soft reset */
3451                         goto unmap_cfgtable;
3452                 }
3453         }
3454
3455         rc = hpsa_controller_hard_reset(pdev, vaddr, use_doorbell);
3456         if (rc)
3457                 goto unmap_cfgtable;
3458
3459         pci_restore_state(pdev);
3460         rc = pci_enable_device(pdev);
3461         if (rc) {
3462                 dev_warn(&pdev->dev, "failed to enable device.\n");
3463                 goto unmap_cfgtable;
3464         }
3465         pci_write_config_word(pdev, 4, command_register);
3466
3467         /* Some devices (notably the HP Smart Array 5i Controller)
3468            need a little pause here */
3469         msleep(HPSA_POST_RESET_PAUSE_MSECS);
3470
3471         /* Wait for board to become not ready, then ready. */
3472         dev_info(&pdev->dev, "Waiting for board to reset.\n");
3473         rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY);
3474         if (rc) {
3475                 dev_warn(&pdev->dev,
3476                         "failed waiting for board to reset."
3477                         " Will try soft reset.\n");
3478                 rc = -ENOTSUPP; /* Not expected, but try soft reset later */
3479                 goto unmap_cfgtable;
3480         }
3481         rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_READY);
3482         if (rc) {
3483                 dev_warn(&pdev->dev,
3484                         "failed waiting for board to become ready "
3485                         "after hard reset\n");
3486                 goto unmap_cfgtable;
3487         }
3488
3489         rc = controller_reset_failed(vaddr);
3490         if (rc < 0)
3491                 goto unmap_cfgtable;
3492         if (rc) {
3493                 dev_warn(&pdev->dev, "Unable to successfully reset "
3494                         "controller. Will try soft reset.\n");
3495                 rc = -ENOTSUPP;
3496         } else {
3497                 dev_info(&pdev->dev, "board ready after hard reset.\n");
3498         }
3499
3500 unmap_cfgtable:
3501         iounmap(cfgtable);
3502
3503 unmap_vaddr:
3504         iounmap(vaddr);
3505         return rc;
3506 }
3507
3508 /*
3509  *  We cannot read the structure directly, for portability we must use
3510  *   the io functions.
3511  *   This is for debug only.
3512  */
3513 static void print_cfg_table(struct device *dev, struct CfgTable *tb)
3514 {
3515 #ifdef HPSA_DEBUG
3516         int i;
3517         char temp_name[17];
3518
3519         dev_info(dev, "Controller Configuration information\n");
3520         dev_info(dev, "------------------------------------\n");
3521         for (i = 0; i < 4; i++)
3522                 temp_name[i] = readb(&(tb->Signature[i]));
3523         temp_name[4] = '\0';
3524         dev_info(dev, "   Signature = %s\n", temp_name);
3525         dev_info(dev, "   Spec Number = %d\n", readl(&(tb->SpecValence)));
3526         dev_info(dev, "   Transport methods supported = 0x%x\n",
3527                readl(&(tb->TransportSupport)));
3528         dev_info(dev, "   Transport methods active = 0x%x\n",
3529                readl(&(tb->TransportActive)));
3530         dev_info(dev, "   Requested transport Method = 0x%x\n",
3531                readl(&(tb->HostWrite.TransportRequest)));
3532         dev_info(dev, "   Coalesce Interrupt Delay = 0x%x\n",
3533                readl(&(tb->HostWrite.CoalIntDelay)));
3534         dev_info(dev, "   Coalesce Interrupt Count = 0x%x\n",
3535                readl(&(tb->HostWrite.CoalIntCount)));
3536         dev_info(dev, "   Max outstanding commands = 0x%d\n",
3537                readl(&(tb->CmdsOutMax)));
3538         dev_info(dev, "   Bus Types = 0x%x\n", readl(&(tb->BusTypes)));
3539         for (i = 0; i < 16; i++)
3540                 temp_name[i] = readb(&(tb->ServerName[i]));
3541         temp_name[16] = '\0';
3542         dev_info(dev, "   Server Name = %s\n", temp_name);
3543         dev_info(dev, "   Heartbeat Counter = 0x%x\n\n\n",
3544                 readl(&(tb->HeartBeat)));
3545 #endif                          /* HPSA_DEBUG */
3546 }
3547
3548 static int find_PCI_BAR_index(struct pci_dev *pdev, unsigned long pci_bar_addr)
3549 {
3550         int i, offset, mem_type, bar_type;
3551
3552         if (pci_bar_addr == PCI_BASE_ADDRESS_0) /* looking for BAR zero? */
3553                 return 0;
3554         offset = 0;
3555         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
3556                 bar_type = pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE;
3557                 if (bar_type == PCI_BASE_ADDRESS_SPACE_IO)
3558                         offset += 4;
3559                 else {
3560                         mem_type = pci_resource_flags(pdev, i) &
3561                             PCI_BASE_ADDRESS_MEM_TYPE_MASK;
3562                         switch (mem_type) {
3563                         case PCI_BASE_ADDRESS_MEM_TYPE_32:
3564                         case PCI_BASE_ADDRESS_MEM_TYPE_1M:
3565                                 offset += 4;    /* 32 bit */
3566                                 break;
3567                         case PCI_BASE_ADDRESS_MEM_TYPE_64:
3568                                 offset += 8;
3569                                 break;
3570                         default:        /* reserved in PCI 2.2 */
3571                                 dev_warn(&pdev->dev,
3572                                        "base address is invalid\n");
3573                                 return -1;
3574                                 break;
3575                         }
3576                 }
3577                 if (offset == pci_bar_addr - PCI_BASE_ADDRESS_0)
3578                         return i + 1;
3579         }
3580         return -1;
3581 }
3582
3583 /* If MSI/MSI-X is supported by the kernel we will try to enable it on
3584  * controllers that are capable. If not, we use IO-APIC mode.
3585  */
3586
3587 static void __devinit hpsa_interrupt_mode(struct ctlr_info *h)
3588 {
3589 #ifdef CONFIG_PCI_MSI
3590         int err;
3591         struct msix_entry hpsa_msix_entries[4] = { {0, 0}, {0, 1},
3592         {0, 2}, {0, 3}
3593         };
3594
3595         /* Some boards advertise MSI but don't really support it */
3596         if ((h->board_id == 0x40700E11) || (h->board_id == 0x40800E11) ||
3597             (h->board_id == 0x40820E11) || (h->board_id == 0x40830E11))
3598                 goto default_int_mode;
3599         if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
3600                 dev_info(&h->pdev->dev, "MSIX\n");
3601                 err = pci_enable_msix(h->pdev, hpsa_msix_entries, 4);
3602                 if (!err) {
3603                         h->intr[0] = hpsa_msix_entries[0].vector;
3604                         h->intr[1] = hpsa_msix_entries[1].vector;
3605                         h->intr[2] = hpsa_msix_entries[2].vector;
3606                         h->intr[3] = hpsa_msix_entries[3].vector;
3607                         h->msix_vector = 1;
3608                         return;
3609                 }
3610                 if (err > 0) {
3611                         dev_warn(&h->pdev->dev, "only %d MSI-X vectors "
3612                                "available\n", err);
3613                         goto default_int_mode;
3614                 } else {
3615                         dev_warn(&h->pdev->dev, "MSI-X init failed %d\n",
3616                                err);
3617                         goto default_int_mode;
3618                 }
3619         }
3620         if (pci_find_capability(h->pdev, PCI_CAP_ID_MSI)) {
3621                 dev_info(&h->pdev->dev, "MSI\n");
3622                 if (!pci_enable_msi(h->pdev))
3623                         h->msi_vector = 1;
3624                 else
3625                         dev_warn(&h->pdev->dev, "MSI init failed\n");
3626         }
3627 default_int_mode:
3628 #endif                          /* CONFIG_PCI_MSI */
3629         /* if we get here we're going to use the default interrupt mode */
3630         h->intr[h->intr_mode] = h->pdev->irq;
3631 }
3632
3633 static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id)
3634 {
3635         int i;
3636         u32 subsystem_vendor_id, subsystem_device_id;
3637
3638         subsystem_vendor_id = pdev->subsystem_vendor;
3639         subsystem_device_id = pdev->subsystem_device;
3640         *board_id = ((subsystem_device_id << 16) & 0xffff0000) |
3641                     subsystem_vendor_id;
3642
3643         for (i = 0; i < ARRAY_SIZE(products); i++)
3644                 if (*board_id == products[i].board_id)
3645                         return i;
3646
3647         if ((subsystem_vendor_id != PCI_VENDOR_ID_HP &&
3648                 subsystem_vendor_id != PCI_VENDOR_ID_COMPAQ) ||
3649                 !hpsa_allow_any) {
3650                 dev_warn(&pdev->dev, "unrecognized board ID: "
3651                         "0x%08x, ignoring.\n", *board_id);
3652                         return -ENODEV;
3653         }
3654         return ARRAY_SIZE(products) - 1; /* generic unknown smart array */
3655 }
3656
3657 static inline bool hpsa_board_disabled(struct pci_dev *pdev)
3658 {
3659         u16 command;
3660
3661         (void) pci_read_config_word(pdev, PCI_COMMAND, &command);
3662         return ((command & PCI_COMMAND_MEMORY) == 0);
3663 }
3664
3665 static int __devinit hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
3666         unsigned long *memory_bar)
3667 {
3668         int i;
3669
3670         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
3671                 if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
3672                         /* addressing mode bits already removed */
3673                         *memory_bar = pci_resource_start(pdev, i);
3674                         dev_dbg(&pdev->dev, "memory BAR = %lx\n",
3675                                 *memory_bar);
3676                         return 0;
3677                 }
3678         dev_warn(&pdev->dev, "no memory BAR found\n");
3679         return -ENODEV;
3680 }
3681
3682 static int __devinit hpsa_wait_for_board_state(struct pci_dev *pdev,
3683         void __iomem *vaddr, int wait_for_ready)
3684 {
3685         int i, iterations;
3686         u32 scratchpad;
3687         if (wait_for_ready)
3688                 iterations = HPSA_BOARD_READY_ITERATIONS;
3689         else
3690                 iterations = HPSA_BOARD_NOT_READY_ITERATIONS;
3691
3692         for (i = 0; i < iterations; i++) {
3693                 scratchpad = readl(vaddr + SA5_SCRATCHPAD_OFFSET);
3694                 if (wait_for_ready) {
3695                         if (scratchpad == HPSA_FIRMWARE_READY)
3696                                 return 0;
3697                 } else {
3698                         if (scratchpad != HPSA_FIRMWARE_READY)
3699                                 return 0;
3700                 }
3701                 msleep(HPSA_BOARD_READY_POLL_INTERVAL_MSECS);
3702         }
3703         dev_warn(&pdev->dev, "board not ready, timed out.\n");
3704         return -ENODEV;
3705 }
3706
3707 static int __devinit hpsa_find_cfg_addrs(struct pci_dev *pdev,
3708         void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
3709         u64 *cfg_offset)
3710 {
3711         *cfg_base_addr = readl(vaddr + SA5_CTCFG_OFFSET);
3712         *cfg_offset = readl(vaddr + SA5_CTMEM_OFFSET);
3713         *cfg_base_addr &= (u32) 0x0000ffff;
3714         *cfg_base_addr_index = find_PCI_BAR_index(pdev, *cfg_base_addr);
3715         if (*cfg_base_addr_index == -1) {
3716                 dev_warn(&pdev->dev, "cannot find cfg_base_addr_index\n");
3717                 return -ENODEV;
3718         }
3719         return 0;
3720 }
3721
3722 static int __devinit hpsa_find_cfgtables(struct ctlr_info *h)
3723 {
3724         u64 cfg_offset;
3725         u32 cfg_base_addr;
3726         u64 cfg_base_addr_index;
3727         u32 trans_offset;
3728         int rc;
3729
3730         rc = hpsa_find_cfg_addrs(h->pdev, h->vaddr, &cfg_base_addr,
3731                 &cfg_base_addr_index, &cfg_offset);
3732         if (rc)
3733                 return rc;
3734         h->cfgtable = remap_pci_mem(pci_resource_start(h->pdev,
3735                        cfg_base_addr_index) + cfg_offset, sizeof(*h->cfgtable));
3736         if (!h->cfgtable)
3737                 return -ENOMEM;
3738         rc = write_driver_ver_to_cfgtable(h->cfgtable);
3739         if (rc)
3740                 return rc;
3741         /* Find performant mode table. */
3742         trans_offset = readl(&h->cfgtable->TransMethodOffset);
3743         h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
3744                                 cfg_base_addr_index)+cfg_offset+trans_offset,
3745                                 sizeof(*h->transtable));
3746         if (!h->transtable)
3747                 return -ENOMEM;
3748         return 0;
3749 }
3750
3751 static void __devinit hpsa_get_max_perf_mode_cmds(struct ctlr_info *h)
3752 {
3753         h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
3754
3755         /* Limit commands in memory limited kdump scenario. */
3756         if (reset_devices && h->max_commands > 32)
3757                 h->max_commands = 32;
3758
3759         if (h->max_commands < 16) {
3760                 dev_warn(&h->pdev->dev, "Controller reports "
3761                         "max supported commands of %d, an obvious lie. "
3762                         "Using 16.  Ensure that firmware is up to date.\n",
3763                         h->max_commands);
3764                 h->max_commands = 16;
3765         }
3766 }
3767
3768 /* Interrogate the hardware for some limits:
3769  * max commands, max SG elements without chaining, and with chaining,
3770  * SG chain block size, etc.
3771  */
3772 static void __devinit hpsa_find_board_params(struct ctlr_info *h)
3773 {
3774         hpsa_get_max_perf_mode_cmds(h);
3775         h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
3776         h->maxsgentries = readl(&(h->cfgtable->MaxScatterGatherElements));
3777         /*
3778          * Limit in-command s/g elements to 32 save dma'able memory.
3779          * Howvever spec says if 0, use 31
3780          */
3781         h->max_cmd_sg_entries = 31;
3782         if (h->maxsgentries > 512) {
3783                 h->max_cmd_sg_entries = 32;
3784                 h->chainsize = h->maxsgentries - h->max_cmd_sg_entries + 1;
3785                 h->maxsgentries--; /* save one for chain pointer */
3786         } else {
3787                 h->maxsgentries = 31; /* default to traditional values */
3788                 h->chainsize = 0;
3789         }
3790 }
3791
3792 static inline bool hpsa_CISS_signature_present(struct ctlr_info *h)
3793 {
3794         if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
3795             (readb(&h->cfgtable->Signature[1]) != 'I') ||
3796             (readb(&h->cfgtable->Signature[2]) != 'S') ||
3797             (readb(&h->cfgtable->Signature[3]) != 'S')) {
3798                 dev_warn(&h->pdev->dev, "not a valid CISS config table\n");
3799                 return false;
3800         }
3801         return true;
3802 }
3803
3804 /* Need to enable prefetch in the SCSI core for 6400 in x86 */
3805 static inline void hpsa_enable_scsi_prefetch(struct ctlr_info *h)
3806 {
3807 #ifdef CONFIG_X86
3808         u32 prefetch;
3809
3810         prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
3811         prefetch |= 0x100;
3812         writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
3813 #endif
3814 }
3815
3816 /* Disable DMA prefetch for the P600.  Otherwise an ASIC bug may result
3817  * in a prefetch beyond physical memory.
3818  */
3819 static inline void hpsa_p600_dma_prefetch_quirk(struct ctlr_info *h)
3820 {
3821         u32 dma_prefetch;
3822
3823         if (h->board_id != 0x3225103C)
3824                 return;
3825         dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
3826         dma_prefetch |= 0x8000;
3827         writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
3828 }
3829
3830 static void __devinit hpsa_wait_for_mode_change_ack(struct ctlr_info *h)
3831 {
3832         int i;
3833         u32 doorbell_value;
3834         unsigned long flags;
3835
3836         /* under certain very rare conditions, this can take awhile.
3837          * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
3838          * as we enter this code.)
3839          */
3840         for (i = 0; i < MAX_CONFIG_WAIT; i++) {
3841                 spin_lock_irqsave(&h->lock, flags);
3842                 doorbell_value = readl(h->vaddr + SA5_DOORBELL);
3843                 spin_unlock_irqrestore(&h->lock, flags);
3844                 if (!(doorbell_value & CFGTBL_ChangeReq))
3845                         break;
3846                 /* delay and try again */
3847                 usleep_range(10000, 20000);
3848         }
3849 }
3850
3851 static int __devinit hpsa_enter_simple_mode(struct ctlr_info *h)
3852 {
3853         u32 trans_support;
3854
3855         trans_support = readl(&(h->cfgtable->TransportSupport));
3856         if (!(trans_support & SIMPLE_MODE))
3857                 return -ENOTSUPP;
3858
3859         h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
3860         /* Update the field, and then ring the doorbell */
3861         writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
3862         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
3863         hpsa_wait_for_mode_change_ack(h);
3864         print_cfg_table(&h->pdev->dev, h->cfgtable);
3865         if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
3866                 dev_warn(&h->pdev->dev,
3867                         "unable to get board into simple mode\n");
3868                 return -ENODEV;
3869         }
3870         h->transMethod = CFGTBL_Trans_Simple;
3871         return 0;
3872 }
3873
3874 static int __devinit hpsa_pci_init(struct ctlr_info *h)
3875 {
3876         int prod_index, err;
3877
3878         prod_index = hpsa_lookup_board_id(h->pdev, &h->board_id);
3879         if (prod_index < 0)
3880                 return -ENODEV;
3881         h->product_name = products[prod_index].product_name;
3882         h->access = *(products[prod_index].access);
3883
3884         if (hpsa_board_disabled(h->pdev)) {
3885                 dev_warn(&h->pdev->dev, "controller appears to be disabled\n");
3886                 return -ENODEV;
3887         }
3888
3889         pci_disable_link_state(h->pdev, PCIE_LINK_STATE_L0S |
3890                                PCIE_LINK_STATE_L1 | PCIE_LINK_STATE_CLKPM);
3891
3892         err = pci_enable_device(h->pdev);
3893         if (err) {
3894                 dev_warn(&h->pdev->dev, "unable to enable PCI device\n");
3895                 return err;
3896         }
3897
3898         err = pci_request_regions(h->pdev, "hpsa");
3899         if (err) {
3900                 dev_err(&h->pdev->dev,
3901                         "cannot obtain PCI resources, aborting\n");
3902                 return err;
3903         }
3904         hpsa_interrupt_mode(h);
3905         err = hpsa_pci_find_memory_BAR(h->pdev, &h->paddr);
3906         if (err)
3907                 goto err_out_free_res;
3908         h->vaddr = remap_pci_mem(h->paddr, 0x250);
3909         if (!h->vaddr) {
3910                 err = -ENOMEM;
3911                 goto err_out_free_res;
3912         }
3913         err = hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY);
3914         if (err)
3915                 goto err_out_free_res;
3916         err = hpsa_find_cfgtables(h);
3917         if (err)
3918                 goto err_out_free_res;
3919         hpsa_find_board_params(h);
3920
3921         if (!hpsa_CISS_signature_present(h)) {
3922                 err = -ENODEV;
3923                 goto err_out_free_res;
3924         }
3925         hpsa_enable_scsi_prefetch(h);
3926         hpsa_p600_dma_prefetch_quirk(h);
3927         err = hpsa_enter_simple_mode(h);
3928         if (err)
3929                 goto err_out_free_res;
3930         return 0;
3931
3932 err_out_free_res:
3933         if (h->transtable)
3934                 iounmap(h->transtable);
3935         if (h->cfgtable)
3936                 iounmap(h->cfgtable);
3937         if (h->vaddr)
3938                 iounmap(h->vaddr);
3939         /*
3940          * Deliberately omit pci_disable_device(): it does something nasty to
3941          * Smart Array controllers that pci_enable_device does not undo
3942          */
3943         pci_release_regions(h->pdev);
3944         return err;
3945 }
3946
3947 static void __devinit hpsa_hba_inquiry(struct ctlr_info *h)
3948 {
3949         int rc;
3950
3951 #define HBA_INQUIRY_BYTE_COUNT 64
3952         h->hba_inquiry_data = kmalloc(HBA_INQUIRY_BYTE_COUNT, GFP_KERNEL);
3953         if (!h->hba_inquiry_data)
3954                 return;
3955         rc = hpsa_scsi_do_inquiry(h, RAID_CTLR_LUNID, 0,
3956                 h->hba_inquiry_data, HBA_INQUIRY_BYTE_COUNT);
3957         if (rc != 0) {
3958                 kfree(h->hba_inquiry_data);
3959                 h->hba_inquiry_data = NULL;
3960         }
3961 }
3962
3963 static __devinit int hpsa_init_reset_devices(struct pci_dev *pdev)
3964 {
3965         int rc, i;
3966
3967         if (!reset_devices)
3968                 return 0;
3969
3970         /* Reset the controller with a PCI power-cycle or via doorbell */
3971         rc = hpsa_kdump_hard_reset_controller(pdev);
3972
3973         /* -ENOTSUPP here means we cannot reset the controller
3974          * but it's already (and still) up and running in
3975          * "performant mode".  Or, it might be 640x, which can't reset
3976          * due to concerns about shared bbwc between 6402/6404 pair.
3977          */
3978         if (rc == -ENOTSUPP)
3979                 return rc; /* just try to do the kdump anyhow. */
3980         if (rc)
3981                 return -ENODEV;
3982
3983         /* Now try to get the controller to respond to a no-op */
3984         dev_warn(&pdev->dev, "Waiting for controller to respond to no-op\n");
3985         for (i = 0; i < HPSA_POST_RESET_NOOP_RETRIES; i++) {
3986                 if (hpsa_noop(pdev) == 0)
3987                         break;
3988                 else
3989                         dev_warn(&pdev->dev, "no-op failed%s\n",
3990                                         (i < 11 ? "; re-trying" : ""));
3991         }
3992         return 0;
3993 }
3994
3995 static __devinit int hpsa_allocate_cmd_pool(struct ctlr_info *h)
3996 {
3997         h->cmd_pool_bits = kzalloc(
3998                 DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG) *
3999                 sizeof(unsigned long), GFP_KERNEL);
4000         h->cmd_pool = pci_alloc_consistent(h->pdev,
4001                     h->nr_cmds * sizeof(*h->cmd_pool),
4002                     &(h->cmd_pool_dhandle));
4003         h->errinfo_pool = pci_alloc_consistent(h->pdev,
4004                     h->nr_cmds * sizeof(*h->errinfo_pool),
4005                     &(h->errinfo_pool_dhandle));
4006         if ((h->cmd_pool_bits == NULL)
4007             || (h->cmd_pool == NULL)
4008             || (h->errinfo_pool == NULL)) {
4009                 dev_err(&h->pdev->dev, "out of memory in %s", __func__);
4010                 return -ENOMEM;
4011         }
4012         return 0;
4013 }
4014
4015 static void hpsa_free_cmd_pool(struct ctlr_info *h)
4016 {
4017         kfree(h->cmd_pool_bits);
4018         if (h->cmd_pool)
4019                 pci_free_consistent(h->pdev,
4020                             h->nr_cmds * sizeof(struct CommandList),
4021                             h->cmd_pool, h->cmd_pool_dhandle);
4022         if (h->errinfo_pool)
4023                 pci_free_consistent(h->pdev,
4024                             h->nr_cmds * sizeof(struct ErrorInfo),
4025                             h->errinfo_pool,
4026                             h->errinfo_pool_dhandle);
4027 }
4028
4029 static int hpsa_request_irq(struct ctlr_info *h,
4030         irqreturn_t (*msixhandler)(int, void *),
4031         irqreturn_t (*intxhandler)(int, void *))
4032 {
4033         int rc;
4034
4035         if (h->msix_vector || h->msi_vector)
4036                 rc = request_irq(h->intr[h->intr_mode], msixhandler,
4037                                 0, h->devname, h);
4038         else
4039                 rc = request_irq(h->intr[h->intr_mode], intxhandler,
4040                                 IRQF_SHARED, h->devname, h);
4041         if (rc) {
4042                 dev_err(&h->pdev->dev, "unable to get irq %d for %s\n",
4043                        h->intr[h->intr_mode], h->devname);
4044                 return -ENODEV;
4045         }
4046         return 0;
4047 }
4048
4049 static int __devinit hpsa_kdump_soft_reset(struct ctlr_info *h)
4050 {
4051         if (hpsa_send_host_reset(h, RAID_CTLR_LUNID,
4052                 HPSA_RESET_TYPE_CONTROLLER)) {
4053                 dev_warn(&h->pdev->dev, "Resetting array controller failed.\n");
4054                 return -EIO;
4055         }
4056
4057         dev_info(&h->pdev->dev, "Waiting for board to soft reset.\n");
4058         if (hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_NOT_READY)) {
4059                 dev_warn(&h->pdev->dev, "Soft reset had no effect.\n");
4060                 return -1;
4061         }
4062
4063         dev_info(&h->pdev->dev, "Board reset, awaiting READY status.\n");
4064         if (hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_READY)) {
4065                 dev_warn(&h->pdev->dev, "Board failed to become ready "
4066                         "after soft reset.\n");
4067                 return -1;
4068         }
4069
4070         return 0;
4071 }
4072
4073 static void hpsa_undo_allocations_after_kdump_soft_reset(struct ctlr_info *h)
4074 {
4075         free_irq(h->intr[h->intr_mode], h);
4076 #ifdef CONFIG_PCI_MSI
4077         if (h->msix_vector)
4078                 pci_disable_msix(h->pdev);
4079         else if (h->msi_vector)
4080                 pci_disable_msi(h->pdev);
4081 #endif /* CONFIG_PCI_MSI */
4082         hpsa_free_sg_chain_blocks(h);
4083         hpsa_free_cmd_pool(h);
4084         kfree(h->blockFetchTable);
4085         pci_free_consistent(h->pdev, h->reply_pool_size,
4086                 h->reply_pool, h->reply_pool_dhandle);
4087         if (h->vaddr)
4088                 iounmap(h->vaddr);
4089         if (h->transtable)
4090                 iounmap(h->transtable);
4091         if (h->cfgtable)
4092                 iounmap(h->cfgtable);
4093         pci_release_regions(h->pdev);
4094         kfree(h);
4095 }
4096
4097 static int __devinit hpsa_init_one(struct pci_dev *pdev,
4098                                     const struct pci_device_id *ent)
4099 {
4100         int dac, rc;
4101         struct ctlr_info *h;
4102         int try_soft_reset = 0;
4103         unsigned long flags;
4104
4105         if (number_of_controllers == 0)
4106                 printk(KERN_INFO DRIVER_NAME "\n");
4107
4108         rc = hpsa_init_reset_devices(pdev);
4109         if (rc) {
4110                 if (rc != -ENOTSUPP)
4111                         return rc;
4112                 /* If the reset fails in a particular way (it has no way to do
4113                  * a proper hard reset, so returns -ENOTSUPP) we can try to do
4114                  * a soft reset once we get the controller configured up to the
4115                  * point that it can accept a command.
4116                  */
4117                 try_soft_reset = 1;
4118                 rc = 0;
4119         }
4120
4121 reinit_after_soft_reset:
4122
4123         /* Command structures must be aligned on a 32-byte boundary because
4124          * the 5 lower bits of the address are used by the hardware. and by
4125          * the driver.  See comments in hpsa.h for more info.
4126          */
4127 #define COMMANDLIST_ALIGNMENT 32
4128         BUILD_BUG_ON(sizeof(struct CommandList) % COMMANDLIST_ALIGNMENT);
4129         h = kzalloc(sizeof(*h), GFP_KERNEL);
4130         if (!h)
4131                 return -ENOMEM;
4132
4133         h->pdev = pdev;
4134         h->busy_initializing = 1;
4135         h->intr_mode = hpsa_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
4136         INIT_LIST_HEAD(&h->cmpQ);
4137         INIT_LIST_HEAD(&h->reqQ);
4138         spin_lock_init(&h->lock);
4139         spin_lock_init(&h->scan_lock);
4140         rc = hpsa_pci_init(h);
4141         if (rc != 0)
4142                 goto clean1;
4143
4144         sprintf(h->devname, "hpsa%d", number_of_controllers);
4145         h->ctlr = number_of_controllers;
4146         number_of_controllers++;
4147
4148         /* configure PCI DMA stuff */
4149         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
4150         if (rc == 0) {
4151                 dac = 1;
4152         } else {
4153                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
4154                 if (rc == 0) {
4155                         dac = 0;
4156                 } else {
4157                         dev_err(&pdev->dev, "no suitable DMA available\n");
4158                         goto clean1;
4159                 }
4160         }
4161
4162         /* make sure the board interrupts are off */
4163         h->access.set_intr_mask(h, HPSA_INTR_OFF);
4164
4165         if (hpsa_request_irq(h, do_hpsa_intr_msi, do_hpsa_intr_intx))
4166                 goto clean2;
4167         dev_info(&pdev->dev, "%s: <0x%x> at IRQ %d%s using DAC\n",
4168                h->devname, pdev->device,
4169                h->intr[h->intr_mode], dac ? "" : " not");
4170         if (hpsa_allocate_cmd_pool(h))
4171                 goto clean4;
4172         if (hpsa_allocate_sg_chain_blocks(h))
4173                 goto clean4;
4174         init_waitqueue_head(&h->scan_wait_queue);
4175         h->scan_finished = 1; /* no scan currently in progress */
4176
4177         pci_set_drvdata(pdev, h);
4178         h->ndevices = 0;
4179         h->scsi_host = NULL;
4180         spin_lock_init(&h->devlock);
4181         hpsa_put_ctlr_into_performant_mode(h);
4182
4183         /* At this point, the controller is ready to take commands.
4184          * Now, if reset_devices and the hard reset didn't work, try
4185          * the soft reset and see if that works.
4186          */
4187         if (try_soft_reset) {
4188
4189                 /* This is kind of gross.  We may or may not get a completion
4190                  * from the soft reset command, and if we do, then the value
4191                  * from the fifo may or may not be valid.  So, we wait 10 secs
4192                  * after the reset throwing away any completions we get during
4193                  * that time.  Unregister the interrupt handler and register
4194                  * fake ones to scoop up any residual completions.
4195                  */
4196                 spin_lock_irqsave(&h->lock, flags);
4197                 h->access.set_intr_mask(h, HPSA_INTR_OFF);
4198                 spin_unlock_irqrestore(&h->lock, flags);
4199                 free_irq(h->intr[h->intr_mode], h);
4200                 rc = hpsa_request_irq(h, hpsa_msix_discard_completions,
4201                                         hpsa_intx_discard_completions);
4202                 if (rc) {
4203                         dev_warn(&h->pdev->dev, "Failed to request_irq after "
4204                                 "soft reset.\n");
4205                         goto clean4;
4206                 }
4207
4208                 rc = hpsa_kdump_soft_reset(h);
4209                 if (rc)
4210                         /* Neither hard nor soft reset worked, we're hosed. */
4211                         goto clean4;
4212
4213                 dev_info(&h->pdev->dev, "Board READY.\n");
4214                 dev_info(&h->pdev->dev,
4215                         "Waiting for stale completions to drain.\n");
4216                 h->access.set_intr_mask(h, HPSA_INTR_ON);
4217                 msleep(10000);
4218                 h->access.set_intr_mask(h, HPSA_INTR_OFF);
4219
4220                 rc = controller_reset_failed(h->cfgtable);
4221                 if (rc)
4222                         dev_info(&h->pdev->dev,
4223                                 "Soft reset appears to have failed.\n");
4224
4225                 /* since the controller's reset, we have to go back and re-init
4226                  * everything.  Easiest to just forget what we've done and do it
4227                  * all over again.
4228                  */
4229                 hpsa_undo_allocations_after_kdump_soft_reset(h);
4230                 try_soft_reset = 0;
4231                 if (rc)
4232                         /* don't go to clean4, we already unallocated */
4233                         return -ENODEV;
4234
4235                 goto reinit_after_soft_reset;
4236         }
4237
4238         /* Turn the interrupts on so we can service requests */
4239         h->access.set_intr_mask(h, HPSA_INTR_ON);
4240
4241         hpsa_hba_inquiry(h);
4242         hpsa_register_scsi(h);  /* hook ourselves into SCSI subsystem */
4243         h->busy_initializing = 0;
4244         return 1;
4245
4246 clean4:
4247         hpsa_free_sg_chain_blocks(h);
4248         hpsa_free_cmd_pool(h);
4249         free_irq(h->intr[h->intr_mode], h);
4250 clean2:
4251 clean1:
4252         h->busy_initializing = 0;
4253         kfree(h);
4254         return rc;
4255 }
4256
4257 static void hpsa_flush_cache(struct ctlr_info *h)
4258 {
4259         char *flush_buf;
4260         struct CommandList *c;
4261
4262         flush_buf = kzalloc(4, GFP_KERNEL);
4263         if (!flush_buf)
4264                 return;
4265
4266         c = cmd_special_alloc(h);
4267         if (!c) {
4268                 dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
4269                 goto out_of_memory;
4270         }
4271         fill_cmd(c, HPSA_CACHE_FLUSH, h, flush_buf, 4, 0,
4272                 RAID_CTLR_LUNID, TYPE_CMD);
4273         hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_TODEVICE);
4274         if (c->err_info->CommandStatus != 0)
4275                 dev_warn(&h->pdev->dev,
4276                         "error flushing cache on controller\n");
4277         cmd_special_free(h, c);
4278 out_of_memory:
4279         kfree(flush_buf);
4280 }
4281
4282 static void hpsa_shutdown(struct pci_dev *pdev)
4283 {
4284         struct ctlr_info *h;
4285
4286         h = pci_get_drvdata(pdev);
4287         /* Turn board interrupts off  and send the flush cache command
4288          * sendcmd will turn off interrupt, and send the flush...
4289          * To write all data in the battery backed cache to disks
4290          */
4291         hpsa_flush_cache(h);
4292         h->access.set_intr_mask(h, HPSA_INTR_OFF);
4293         free_irq(h->intr[h->intr_mode], h);
4294 #ifdef CONFIG_PCI_MSI
4295         if (h->msix_vector)
4296                 pci_disable_msix(h->pdev);
4297         else if (h->msi_vector)
4298                 pci_disable_msi(h->pdev);
4299 #endif                          /* CONFIG_PCI_MSI */
4300 }
4301
4302 static void __devexit hpsa_remove_one(struct pci_dev *pdev)
4303 {
4304         struct ctlr_info *h;
4305
4306         if (pci_get_drvdata(pdev) == NULL) {
4307                 dev_err(&pdev->dev, "unable to remove device \n");
4308                 return;
4309         }
4310         h = pci_get_drvdata(pdev);
4311         hpsa_unregister_scsi(h);        /* unhook from SCSI subsystem */
4312         hpsa_shutdown(pdev);
4313         iounmap(h->vaddr);
4314         iounmap(h->transtable);
4315         iounmap(h->cfgtable);
4316         hpsa_free_sg_chain_blocks(h);
4317         pci_free_consistent(h->pdev,
4318                 h->nr_cmds * sizeof(struct CommandList),
4319                 h->cmd_pool, h->cmd_pool_dhandle);
4320         pci_free_consistent(h->pdev,
4321                 h->nr_cmds * sizeof(struct ErrorInfo),
4322                 h->errinfo_pool, h->errinfo_pool_dhandle);
4323         pci_free_consistent(h->pdev, h->reply_pool_size,
4324                 h->reply_pool, h->reply_pool_dhandle);
4325         kfree(h->cmd_pool_bits);
4326         kfree(h->blockFetchTable);
4327         kfree(h->hba_inquiry_data);
4328         /*
4329          * Deliberately omit pci_disable_device(): it does something nasty to
4330          * Smart Array controllers that pci_enable_device does not undo
4331          */
4332         pci_release_regions(pdev);
4333         pci_set_drvdata(pdev, NULL);
4334         kfree(h);
4335 }
4336
4337 static int hpsa_suspend(__attribute__((unused)) struct pci_dev *pdev,
4338         __attribute__((unused)) pm_message_t state)
4339 {
4340         return -ENOSYS;
4341 }
4342
4343 static int hpsa_resume(__attribute__((unused)) struct pci_dev *pdev)
4344 {
4345         return -ENOSYS;
4346 }
4347
4348 static struct pci_driver hpsa_pci_driver = {
4349         .name = "hpsa",
4350         .probe = hpsa_init_one,
4351         .remove = __devexit_p(hpsa_remove_one),
4352         .id_table = hpsa_pci_device_id, /* id_table */
4353         .shutdown = hpsa_shutdown,
4354         .suspend = hpsa_suspend,
4355         .resume = hpsa_resume,
4356 };
4357
4358 /* Fill in bucket_map[], given nsgs (the max number of
4359  * scatter gather elements supported) and bucket[],
4360  * which is an array of 8 integers.  The bucket[] array
4361  * contains 8 different DMA transfer sizes (in 16
4362  * byte increments) which the controller uses to fetch
4363  * commands.  This function fills in bucket_map[], which
4364  * maps a given number of scatter gather elements to one of
4365  * the 8 DMA transfer sizes.  The point of it is to allow the
4366  * controller to only do as much DMA as needed to fetch the
4367  * command, with the DMA transfer size encoded in the lower
4368  * bits of the command address.
4369  */
4370 static void  calc_bucket_map(int bucket[], int num_buckets,
4371         int nsgs, int *bucket_map)
4372 {
4373         int i, j, b, size;
4374
4375         /* even a command with 0 SGs requires 4 blocks */
4376 #define MINIMUM_TRANSFER_BLOCKS 4
4377 #define NUM_BUCKETS 8
4378         /* Note, bucket_map must have nsgs+1 entries. */
4379         for (i = 0; i <= nsgs; i++) {
4380                 /* Compute size of a command with i SG entries */
4381                 size = i + MINIMUM_TRANSFER_BLOCKS;
4382                 b = num_buckets; /* Assume the biggest bucket */
4383                 /* Find the bucket that is just big enough */
4384                 for (j = 0; j < 8; j++) {
4385                         if (bucket[j] >= size) {
4386                                 b = j;
4387                                 break;
4388                         }
4389                 }
4390                 /* for a command with i SG entries, use bucket b. */
4391                 bucket_map[i] = b;
4392         }
4393 }
4394
4395 static __devinit void hpsa_enter_performant_mode(struct ctlr_info *h,
4396         u32 use_short_tags)
4397 {
4398         int i;
4399         unsigned long register_value;
4400
4401         /* This is a bit complicated.  There are 8 registers on
4402          * the controller which we write to to tell it 8 different
4403          * sizes of commands which there may be.  It's a way of
4404          * reducing the DMA done to fetch each command.  Encoded into
4405          * each command's tag are 3 bits which communicate to the controller
4406          * which of the eight sizes that command fits within.  The size of
4407          * each command depends on how many scatter gather entries there are.
4408          * Each SG entry requires 16 bytes.  The eight registers are programmed
4409          * with the number of 16-byte blocks a command of that size requires.
4410          * The smallest command possible requires 5 such 16 byte blocks.
4411          * the largest command possible requires MAXSGENTRIES + 4 16-byte
4412          * blocks.  Note, this only extends to the SG entries contained
4413          * within the command block, and does not extend to chained blocks
4414          * of SG elements.   bft[] contains the eight values we write to
4415          * the registers.  They are not evenly distributed, but have more
4416          * sizes for small commands, and fewer sizes for larger commands.
4417          */
4418         int bft[8] = {5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
4419         BUILD_BUG_ON(28 > MAXSGENTRIES + 4);
4420         /*  5 = 1 s/g entry or 4k
4421          *  6 = 2 s/g entry or 8k
4422          *  8 = 4 s/g entry or 16k
4423          * 10 = 6 s/g entry or 24k
4424          */
4425
4426         h->reply_pool_wraparound = 1; /* spec: init to 1 */
4427
4428         /* Controller spec: zero out this buffer. */
4429         memset(h->reply_pool, 0, h->reply_pool_size);
4430         h->reply_pool_head = h->reply_pool;
4431
4432         bft[7] = h->max_sg_entries + 4;
4433         calc_bucket_map(bft, ARRAY_SIZE(bft), 32, h->blockFetchTable);
4434         for (i = 0; i < 8; i++)
4435                 writel(bft[i], &h->transtable->BlockFetch[i]);
4436
4437         /* size of controller ring buffer */
4438         writel(h->max_commands, &h->transtable->RepQSize);
4439         writel(1, &h->transtable->RepQCount);
4440         writel(0, &h->transtable->RepQCtrAddrLow32);
4441         writel(0, &h->transtable->RepQCtrAddrHigh32);
4442         writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
4443         writel(0, &h->transtable->RepQAddr0High32);
4444         writel(CFGTBL_Trans_Performant | use_short_tags,
4445                 &(h->cfgtable->HostWrite.TransportRequest));
4446         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
4447         hpsa_wait_for_mode_change_ack(h);
4448         register_value = readl(&(h->cfgtable->TransportActive));
4449         if (!(register_value & CFGTBL_Trans_Performant)) {
4450                 dev_warn(&h->pdev->dev, "unable to get board into"
4451                                         " performant mode\n");
4452                 return;
4453         }
4454         /* Change the access methods to the performant access methods */
4455         h->access = SA5_performant_access;
4456         h->transMethod = CFGTBL_Trans_Performant;
4457 }
4458
4459 static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
4460 {
4461         u32 trans_support;
4462
4463         if (hpsa_simple_mode)
4464                 return;
4465
4466         trans_support = readl(&(h->cfgtable->TransportSupport));
4467         if (!(trans_support & PERFORMANT_MODE))
4468                 return;
4469
4470         hpsa_get_max_perf_mode_cmds(h);
4471         h->max_sg_entries = 32;
4472         /* Performant mode ring buffer and supporting data structures */
4473         h->reply_pool_size = h->max_commands * sizeof(u64);
4474         h->reply_pool = pci_alloc_consistent(h->pdev, h->reply_pool_size,
4475                                 &(h->reply_pool_dhandle));
4476
4477         /* Need a block fetch table for performant mode */
4478         h->blockFetchTable = kmalloc(((h->max_sg_entries+1) *
4479                                 sizeof(u32)), GFP_KERNEL);
4480
4481         if ((h->reply_pool == NULL)
4482                 || (h->blockFetchTable == NULL))
4483                 goto clean_up;
4484
4485         hpsa_enter_performant_mode(h,
4486                 trans_support & CFGTBL_Trans_use_short_tags);
4487
4488         return;
4489
4490 clean_up:
4491         if (h->reply_pool)
4492                 pci_free_consistent(h->pdev, h->reply_pool_size,
4493                         h->reply_pool, h->reply_pool_dhandle);
4494         kfree(h->blockFetchTable);
4495 }
4496
4497 /*
4498  *  This is it.  Register the PCI driver information for the cards we control
4499  *  the OS will call our registered routines when it finds one of our cards.
4500  */
4501 static int __init hpsa_init(void)
4502 {
4503         return pci_register_driver(&hpsa_pci_driver);
4504 }
4505
4506 static void __exit hpsa_cleanup(void)
4507 {
4508         pci_unregister_driver(&hpsa_pci_driver);
4509 }
4510
4511 module_init(hpsa_init);
4512 module_exit(hpsa_cleanup);