drivers/ide/ide-pm.c

   1 #include <linux/kernel.h>
   2 #include <linux/gfp.h>
   3 #include <linux/ide.h>
   4
   5 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
   6 {
   7         ide_drive_t *drive = to_ide_device(dev);
   8         ide_drive_t *pair = ide_get_pair_dev(drive);
   9         ide_hwif_t *hwif = drive->hwif;
  10         struct request *rq;
  11         struct ide_pm_state rqpm;
  12         int ret;
  13
  14         if (ide_port_acpi(hwif)) {
  15                 /* call ACPI _GTM only once */
  16                 if ((drive->dn & 1) == 0 || pair == NULL)
  17                         ide_acpi_get_timing(hwif);
  18         }
  19
  20         memset(&rqpm, 0, sizeof(rqpm));
  21         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
  22         scsi_req_init(rq);
  23         ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
  24         rq->special = &rqpm;
  25         rqpm.pm_step = IDE_PM_START_SUSPEND;
  26         if (mesg.event == PM_EVENT_PRETHAW)
  27                 mesg.event = PM_EVENT_FREEZE;
  28         rqpm.pm_state = mesg.event;
  29
  30         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
  31         blk_put_request(rq);
  32
  33         if (ret == 0 && ide_port_acpi(hwif)) {
  34                 /* call ACPI _PS3 only after both devices are suspended */
  35                 if ((drive->dn & 1) || pair == NULL)
  36                         ide_acpi_set_state(hwif, 0);
  37         }
  38
  39         return ret;
  40 }
  41
  42 static void ide_end_sync_rq(struct request *rq, int error)
  43 {
  44         complete(rq->end_io_data);
  45 }
  46
  47 static int ide_pm_execute_rq(struct request *rq)
  48 {
  49         struct request_queue *q = rq->q;
  50         DECLARE_COMPLETION_ONSTACK(wait);
  51
  52         rq->end_io_data = &wait;
  53         rq->end_io = ide_end_sync_rq;
  54
  55         spin_lock_irq(q->queue_lock);
  56         if (unlikely(blk_queue_dying(q))) {
  57                 rq->rq_flags |= RQF_QUIET;
  58                 rq->errors = -ENXIO;
  59                 __blk_end_request_all(rq, rq->errors);
  60                 spin_unlock_irq(q->queue_lock);
  61                 return -ENXIO;
  62         }
  63         __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
  64         __blk_run_queue_uncond(q);
  65         spin_unlock_irq(q->queue_lock);
  66
  67         wait_for_completion_io(&wait);
  68
  69         return rq->errors ? -EIO : 0;
  70 }
  71
  72 int generic_ide_resume(struct device *dev)
  73 {
  74         ide_drive_t *drive = to_ide_device(dev);
  75         ide_drive_t *pair = ide_get_pair_dev(drive);
  76         ide_hwif_t *hwif = drive->hwif;
  77         struct request *rq;
  78         struct ide_pm_state rqpm;
  79         int err;
  80
  81         if (ide_port_acpi(hwif)) {
  82                 /* call ACPI _PS0 / _STM only once */
  83                 if ((drive->dn & 1) == 0 || pair == NULL) {
  84                         ide_acpi_set_state(hwif, 1);
  85                         ide_acpi_push_timing(hwif);
  86                 }
  87
  88                 ide_acpi_exec_tfs(drive);
  89         }
  90
  91         memset(&rqpm, 0, sizeof(rqpm));
  92         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
  93         scsi_req_init(rq);
  94         ide_req(rq)->type = ATA_PRIV_PM_RESUME;
  95         rq->rq_flags |= RQF_PREEMPT;
  96         rq->special = &rqpm;
  97         rqpm.pm_step = IDE_PM_START_RESUME;
  98         rqpm.pm_state = PM_EVENT_ON;
  99
 100         err = ide_pm_execute_rq(rq);
 101         blk_put_request(rq);
 102
 103         if (err == 0 && dev->driver) {
 104                 struct ide_driver *drv = to_ide_driver(dev->driver);
 105
 106                 if (drv->resume)
 107                         drv->resume(drive);
 108         }
 109
 110         return err;
 111 }
 112
 113 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
 114 {
 115         struct ide_pm_state *pm = rq->special;
 116
 117 #ifdef DEBUG_PM
 118         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
 119                 drive->name, pm->pm_step);
 120 #endif
 121         if (drive->media != ide_disk)
 122                 return;
 123
 124         switch (pm->pm_step) {
 125         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 126                 if (pm->pm_state == PM_EVENT_FREEZE)
 127                         pm->pm_step = IDE_PM_COMPLETED;
 128                 else
 129                         pm->pm_step = IDE_PM_STANDBY;
 130                 break;
 131         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 132                 pm->pm_step = IDE_PM_COMPLETED;
 133                 break;
 134         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 135                 pm->pm_step = IDE_PM_IDLE;
 136                 break;
 137         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 138                 pm->pm_step = IDE_PM_RESTORE_DMA;
 139                 break;
 140         }
 141 }
 142
 143 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 144 {
 145         struct ide_pm_state *pm = rq->special;
 146         struct ide_cmd cmd = { };
 147
 148         switch (pm->pm_step) {
 149         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 150                 if (drive->media != ide_disk)
 151                         break;
 152                 /* Not supported? Switch to next step now. */
 153                 if (ata_id_flush_enabled(drive->id) == 0 ||
 154                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 155                         ide_complete_power_step(drive, rq);
 156                         return ide_stopped;
 157                 }
 158                 if (ata_id_flush_ext_enabled(drive->id))
 159                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
 160                 else
 161                         cmd.tf.command = ATA_CMD_FLUSH;
 162                 goto out_do_tf;
 163         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 164                 cmd.tf.command = ATA_CMD_STANDBYNOW1;
 165                 goto out_do_tf;
 166         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 167                 ide_set_max_pio(drive);
 168                 /*
 169                  * skip IDE_PM_IDLE for ATAPI devices
 170                  */
 171                 if (drive->media != ide_disk)
 172                         pm->pm_step = IDE_PM_RESTORE_DMA;
 173                 else
 174                         ide_complete_power_step(drive, rq);
 175                 return ide_stopped;
 176         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 177                 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
 178                 goto out_do_tf;
 179         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 180                 /*
 181                  * Right now, all we do is call ide_set_dma(drive),
 182                  * we could be smarter and check for current xfer_speed
 183                  * in struct drive etc...
 184                  */
 185                 if (drive->hwif->dma_ops == NULL)
 186                         break;
 187                 /*
 188                  * TODO: respect IDE_DFLAG_USING_DMA
 189                  */
 190                 ide_set_dma(drive);
 191                 break;
 192         }
 193
 194         pm->pm_step = IDE_PM_COMPLETED;
 195
 196         return ide_stopped;
 197
 198 out_do_tf:
 199         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 200         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 201         cmd.protocol = ATA_PROT_NODATA;
 202
 203         return do_rw_taskfile(drive, &cmd);
 204 }
 205
 206 /**
 207  *      ide_complete_pm_rq - end the current Power Management request
 208  *      @drive: target drive
 209  *      @rq: request
 210  *
 211  *      This function cleans up the current PM request and stops the queue
 212  *      if necessary.
 213  */
 214 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 215 {
 216         struct request_queue *q = drive->queue;
 217         struct ide_pm_state *pm = rq->special;
 218         unsigned long flags;
 219
 220         ide_complete_power_step(drive, rq);
 221         if (pm->pm_step != IDE_PM_COMPLETED)
 222                 return;
 223
 224 #ifdef DEBUG_PM
 225         printk("%s: completing PM request, %s\n", drive->name,
 226                (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
 227 #endif
 228         spin_lock_irqsave(q->queue_lock, flags);
 229         if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
 230                 blk_stop_queue(q);
 231         else
 232                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 233         spin_unlock_irqrestore(q->queue_lock, flags);
 234
 235         drive->hwif->rq = NULL;
 236
 237         if (blk_end_request(rq, 0, 0))
 238                 BUG();
 239 }
 240
 241 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 242 {
 243         struct ide_pm_state *pm = rq->special;
 244
 245         if (blk_rq_is_private(rq) &&
 246             ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
 247             pm->pm_step == IDE_PM_START_SUSPEND)
 248                 /* Mark drive blocked when starting the suspend sequence. */
 249                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 250         else if (blk_rq_is_private(rq) &&
 251                  ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
 252                  pm->pm_step == IDE_PM_START_RESUME) {
 253                 /*
 254                  * The first thing we do on wakeup is to wait for BSY bit to
 255                  * go away (with a looong timeout) as a drive on this hwif may
 256                  * just be POSTing itself.
 257                  * We do that before even selecting as the "other" device on
 258                  * the bus may be broken enough to walk on our toes at this
 259                  * point.
 260                  */
 261                 ide_hwif_t *hwif = drive->hwif;
 262                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 263                 struct request_queue *q = drive->queue;
 264                 unsigned long flags;
 265                 int rc;
 266 #ifdef DEBUG_PM
 267                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 268 #endif
 269                 rc = ide_wait_not_busy(hwif, 35000);
 270                 if (rc)
 271                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 272                 tp_ops->dev_select(drive);
 273                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 274                 rc = ide_wait_not_busy(hwif, 100000);
 275                 if (rc)
 276                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 277
 278                 spin_lock_irqsave(q->queue_lock, flags);
 279                 blk_start_queue(q);
 280                 spin_unlock_irqrestore(q->queue_lock, flags);
 281         }
 282 }