arch/s390/pci/pci_clp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2012
   4  *
   5  * Author(s):
   6  *   Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8
   9 #define KMSG_COMPONENT "zpci"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/compat.h>
  13 #include <linux/kernel.h>
  14 #include <linux/miscdevice.h>
  15 #include <linux/slab.h>
  16 #include <linux/err.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci.h>
  19 #include <linux/uaccess.h>
  20 #include <asm/pci_debug.h>
  21 #include <asm/pci_clp.h>
  22 #include <asm/clp.h>
  23 #include <uapi/asm/clp.h>
  24
  25 bool zpci_unique_uid;
  26
  27 void update_uid_checking(bool new)
  28 {
  29         if (zpci_unique_uid != new)
  30                 zpci_dbg(1, "uid checking:%d\n", new);
  31
  32         zpci_unique_uid = new;
  33 }
  34
  35 static inline void zpci_err_clp(unsigned int rsp, int rc)
  36 {
  37         struct {
  38                 unsigned int rsp;
  39                 int rc;
  40         } __packed data = {rsp, rc};
  41
  42         zpci_err_hex(&data, sizeof(data));
  43 }
  44
  45 /*
  46  * Call Logical Processor with c=1, lps=0 and command 1
  47  * to get the bit mask of installed logical processors
  48  */
  49 static inline int clp_get_ilp(unsigned long *ilp)
  50 {
  51         unsigned long mask;
  52         int cc = 3;
  53
  54         asm volatile (
  55                 "       .insn   rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
  56                 "0:     ipm     %[cc]\n"
  57                 "       srl     %[cc],28\n"
  58                 "1:\n"
  59                 EX_TABLE(0b, 1b)
  60                 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
  61                 : "cc");
  62         *ilp = mask;
  63         return cc;
  64 }
  65
  66 /*
  67  * Call Logical Processor with c=0, the give constant lps and an lpcb request.
  68  */
  69 static __always_inline int clp_req(void *data, unsigned int lps)
  70 {
  71         struct { u8 _[CLP_BLK_SIZE]; } *req = data;
  72         u64 ignored;
  73         int cc = 3;
  74
  75         asm volatile (
  76                 "       .insn   rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
  77                 "0:     ipm     %[cc]\n"
  78                 "       srl     %[cc],28\n"
  79                 "1:\n"
  80                 EX_TABLE(0b, 1b)
  81                 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
  82                 : [req] "a" (req), [lps] "i" (lps)
  83                 : "cc");
  84         return cc;
  85 }
  86
  87 static void *clp_alloc_block(gfp_t gfp_mask)
  88 {
  89         return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
  90 }
  91
  92 static void clp_free_block(void *ptr)
  93 {
  94         free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
  95 }
  96
  97 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
  98                                       struct clp_rsp_query_pci_grp *response)
  99 {
 100         zdev->tlb_refresh = response->refresh;
 101         zdev->dma_mask = response->dasm;
 102         zdev->msi_addr = response->msia;
 103         zdev->max_msi = response->noi;
 104         zdev->fmb_update = response->mui;
 105         zdev->version = response->version;
 106
 107         switch (response->version) {
 108         case 1:
 109                 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
 110                 break;
 111         default:
 112                 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
 113                 break;
 114         }
 115 }
 116
 117 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
 118 {
 119         struct clp_req_rsp_query_pci_grp *rrb;
 120         int rc;
 121
 122         rrb = clp_alloc_block(GFP_KERNEL);
 123         if (!rrb)
 124                 return -ENOMEM;
 125
 126         memset(rrb, 0, sizeof(*rrb));
 127         rrb->request.hdr.len = sizeof(rrb->request);
 128         rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
 129         rrb->response.hdr.len = sizeof(rrb->response);
 130         rrb->request.pfgid = pfgid;
 131
 132         rc = clp_req(rrb, CLP_LPS_PCI);
 133         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 134                 clp_store_query_pci_fngrp(zdev, &rrb->response);
 135         else {
 136                 zpci_err("Q PCI FGRP:\n");
 137                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 138                 rc = -EIO;
 139         }
 140         clp_free_block(rrb);
 141         return rc;
 142 }
 143
 144 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 145                                   struct clp_rsp_query_pci *response)
 146 {
 147         int i;
 148
 149         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 150                 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
 151                 zdev->bars[i].size = response->bar_size[i];
 152         }
 153         zdev->start_dma = response->sdma;
 154         zdev->end_dma = response->edma;
 155         zdev->pchid = response->pchid;
 156         zdev->pfgid = response->pfgid;
 157         zdev->pft = response->pft;
 158         zdev->vfn = response->vfn;
 159         zdev->port = response->port;
 160         zdev->uid = response->uid;
 161         zdev->fmb_length = sizeof(u32) * response->fmb_len;
 162         zdev->rid_available = response->rid_avail;
 163         zdev->is_physfn = response->is_physfn;
 164         if (!s390_pci_no_rid && zdev->rid_available)
 165                 zdev->devfn = response->rid & ZPCI_RID_MASK_DEVFN;
 166
 167         memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 168         if (response->util_str_avail) {
 169                 memcpy(zdev->util_str, response->util_str,
 170                        sizeof(zdev->util_str));
 171                 zdev->util_str_avail = 1;
 172         }
 173         zdev->mio_capable = response->mio_addr_avail;
 174         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 175                 if (!(response->mio.valid & (1 << (PCI_STD_NUM_BARS - i - 1))))
 176                         continue;
 177
 178                 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
 179                 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
 180         }
 181         return 0;
 182 }
 183
 184 int clp_query_pci_fn(struct zpci_dev *zdev)
 185 {
 186         struct clp_req_rsp_query_pci *rrb;
 187         int rc;
 188
 189         rrb = clp_alloc_block(GFP_KERNEL);
 190         if (!rrb)
 191                 return -ENOMEM;
 192
 193         memset(rrb, 0, sizeof(*rrb));
 194         rrb->request.hdr.len = sizeof(rrb->request);
 195         rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
 196         rrb->response.hdr.len = sizeof(rrb->response);
 197         rrb->request.fh = zdev->fh;
 198
 199         rc = clp_req(rrb, CLP_LPS_PCI);
 200         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 201                 rc = clp_store_query_pci_fn(zdev, &rrb->response);
 202                 if (rc)
 203                         goto out;
 204                 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
 205         } else {
 206                 zpci_err("Q PCI FN:\n");
 207                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 208                 rc = -EIO;
 209         }
 210 out:
 211         clp_free_block(rrb);
 212         return rc;
 213 }
 214
 215 static int clp_refresh_fh(u32 fid);
 216 /**
 217  * clp_set_pci_fn() - Execute a command on a PCI function
 218  * @zdev: Function that will be affected
 219  * @nr_dma_as: DMA address space number
 220  * @command: The command code to execute
 221  *
 222  * Returns: 0 on success, < 0 for Linux errors (e.g. -ENOMEM), and
 223  * > 0 for non-success platform responses
 224  */
 225 static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
 226 {
 227         struct clp_req_rsp_set_pci *rrb;
 228         int rc, retries = 100;
 229
 230         rrb = clp_alloc_block(GFP_KERNEL);
 231         if (!rrb)
 232                 return -ENOMEM;
 233
 234         do {
 235                 memset(rrb, 0, sizeof(*rrb));
 236                 rrb->request.hdr.len = sizeof(rrb->request);
 237                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 238                 rrb->response.hdr.len = sizeof(rrb->response);
 239                 rrb->request.fh = zdev->fh;
 240                 rrb->request.oc = command;
 241                 rrb->request.ndas = nr_dma_as;
 242
 243                 rc = clp_req(rrb, CLP_LPS_PCI);
 244                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 245                         retries--;
 246                         if (retries < 0)
 247                                 break;
 248                         msleep(20);
 249                 }
 250         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 251
 252         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 253                 zdev->fh = rrb->response.fh;
 254         } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY) {
 255                 /* Function is already in desired state - update handle */
 256                 rc = clp_refresh_fh(zdev->fid);
 257         } else {
 258                 zpci_err("Set PCI FN:\n");
 259                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 260                 if (!rc)
 261                         rc = rrb->response.hdr.rsp;
 262         }
 263         clp_free_block(rrb);
 264         return rc;
 265 }
 266
 267 int clp_setup_writeback_mio(void)
 268 {
 269         struct clp_req_rsp_slpc_pci *rrb;
 270         u8  wb_bit_pos;
 271         int rc;
 272
 273         rrb = clp_alloc_block(GFP_KERNEL);
 274         if (!rrb)
 275                 return -ENOMEM;
 276
 277         memset(rrb, 0, sizeof(*rrb));
 278         rrb->request.hdr.len = sizeof(rrb->request);
 279         rrb->request.hdr.cmd = CLP_SLPC;
 280         rrb->response.hdr.len = sizeof(rrb->response);
 281
 282         rc = clp_req(rrb, CLP_LPS_PCI);
 283         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 284                 if (rrb->response.vwb) {
 285                         wb_bit_pos = rrb->response.mio_wb;
 286                         set_bit_inv(wb_bit_pos, &mio_wb_bit_mask);
 287                         zpci_dbg(3, "wb bit: %d\n", wb_bit_pos);
 288                 } else {
 289                         zpci_dbg(3, "wb bit: n.a.\n");
 290                 }
 291
 292         } else {
 293                 zpci_err("SLPC PCI:\n");
 294                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 295                 rc = -EIO;
 296         }
 297         clp_free_block(rrb);
 298         return rc;
 299 }
 300
 301 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 302 {
 303         int rc;
 304
 305         rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 306         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 307         if (!rc && zpci_use_mio(zdev)) {
 308                 rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
 309                 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
 310                                 zdev->fid, zdev->fh, rc);
 311                 if (rc)
 312                         clp_disable_fh(zdev);
 313         }
 314         return rc;
 315 }
 316
 317 int clp_disable_fh(struct zpci_dev *zdev)
 318 {
 319         int rc;
 320
 321         if (!zdev_enabled(zdev))
 322                 return 0;
 323
 324         rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
 325         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 326         return rc;
 327 }
 328
 329 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
 330                         void (*cb)(struct clp_fh_list_entry *, void *))
 331 {
 332         u64 resume_token = 0;
 333         int entries, i, rc;
 334
 335         do {
 336                 memset(rrb, 0, sizeof(*rrb));
 337                 rrb->request.hdr.len = sizeof(rrb->request);
 338                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 339                 /* store as many entries as possible */
 340                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 341                 rrb->request.resume_token = resume_token;
 342
 343                 /* Get PCI function handle list */
 344                 rc = clp_req(rrb, CLP_LPS_PCI);
 345                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 346                         zpci_err("List PCI FN:\n");
 347                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 348                         rc = -EIO;
 349                         goto out;
 350                 }
 351
 352                 update_uid_checking(rrb->response.uid_checking);
 353                 WARN_ON_ONCE(rrb->response.entry_size !=
 354                         sizeof(struct clp_fh_list_entry));
 355
 356                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 357                         rrb->response.entry_size;
 358
 359                 resume_token = rrb->response.resume_token;
 360                 for (i = 0; i < entries; i++)
 361                         cb(&rrb->response.fh_list[i], data);
 362         } while (resume_token);
 363 out:
 364         return rc;
 365 }
 366
 367 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 368 {
 369         struct zpci_dev *zdev;
 370
 371         if (!entry->vendor_id)
 372                 return;
 373
 374         zdev = get_zdev_by_fid(entry->fid);
 375         if (!zdev)
 376                 zpci_create_device(entry->fid, entry->fh, entry->config_state);
 377 }
 378
 379 int clp_scan_pci_devices(void)
 380 {
 381         struct clp_req_rsp_list_pci *rrb;
 382         int rc;
 383
 384         rrb = clp_alloc_block(GFP_KERNEL);
 385         if (!rrb)
 386                 return -ENOMEM;
 387
 388         rc = clp_list_pci(rrb, NULL, __clp_add);
 389
 390         clp_free_block(rrb);
 391         return rc;
 392 }
 393
 394 static void __clp_refresh_fh(struct clp_fh_list_entry *entry, void *data)
 395 {
 396         struct zpci_dev *zdev;
 397         u32 fid = *((u32 *)data);
 398
 399         if (!entry->vendor_id || fid != entry->fid)
 400                 return;
 401
 402         zdev = get_zdev_by_fid(fid);
 403         if (!zdev)
 404                 return;
 405
 406         zdev->fh = entry->fh;
 407 }
 408
 409 /*
 410  * Refresh the function handle of the function matching @fid
 411  */
 412 static int clp_refresh_fh(u32 fid)
 413 {
 414         struct clp_req_rsp_list_pci *rrb;
 415         int rc;
 416
 417         rrb = clp_alloc_block(GFP_NOWAIT);
 418         if (!rrb)
 419                 return -ENOMEM;
 420
 421         rc = clp_list_pci(rrb, &fid, __clp_refresh_fh);
 422
 423         clp_free_block(rrb);
 424         return rc;
 425 }
 426
 427 struct clp_state_data {
 428         u32 fid;
 429         enum zpci_state state;
 430 };
 431
 432 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
 433 {
 434         struct clp_state_data *sd = data;
 435
 436         if (entry->fid != sd->fid)
 437                 return;
 438
 439         sd->state = entry->config_state;
 440 }
 441
 442 int clp_get_state(u32 fid, enum zpci_state *state)
 443 {
 444         struct clp_req_rsp_list_pci *rrb;
 445         struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 446         int rc;
 447
 448         rrb = clp_alloc_block(GFP_ATOMIC);
 449         if (!rrb)
 450                 return -ENOMEM;
 451
 452         rc = clp_list_pci(rrb, &sd, __clp_get_state);
 453         if (!rc)
 454                 *state = sd.state;
 455
 456         clp_free_block(rrb);
 457         return rc;
 458 }
 459
 460 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 461 {
 462         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 463
 464         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 465             lpcb->response.hdr.len > limit)
 466                 return -EINVAL;
 467         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 468 }
 469
 470 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 471 {
 472         switch (lpcb->cmd) {
 473         case 0x0001: /* store logical-processor characteristics */
 474                 return clp_base_slpc(req, (void *) lpcb);
 475         default:
 476                 return -EINVAL;
 477         }
 478 }
 479
 480 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_pci *lpcb)
 481 {
 482         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 483
 484         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 485             lpcb->response.hdr.len > limit)
 486                 return -EINVAL;
 487         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 488 }
 489
 490 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 491 {
 492         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 493
 494         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 495             lpcb->response.hdr.len > limit)
 496                 return -EINVAL;
 497         if (lpcb->request.reserved2 != 0)
 498                 return -EINVAL;
 499         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 500 }
 501
 502 static int clp_pci_query(struct clp_req *req,
 503                          struct clp_req_rsp_query_pci *lpcb)
 504 {
 505         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 506
 507         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 508             lpcb->response.hdr.len > limit)
 509                 return -EINVAL;
 510         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 511                 return -EINVAL;
 512         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 513 }
 514
 515 static int clp_pci_query_grp(struct clp_req *req,
 516                              struct clp_req_rsp_query_pci_grp *lpcb)
 517 {
 518         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 519
 520         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 521             lpcb->response.hdr.len > limit)
 522                 return -EINVAL;
 523         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 524             lpcb->request.reserved4 != 0)
 525                 return -EINVAL;
 526         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 527 }
 528
 529 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 530 {
 531         switch (lpcb->cmd) {
 532         case 0x0001: /* store logical-processor characteristics */
 533                 return clp_pci_slpc(req, (void *) lpcb);
 534         case 0x0002: /* list PCI functions */
 535                 return clp_pci_list(req, (void *) lpcb);
 536         case 0x0003: /* query PCI function */
 537                 return clp_pci_query(req, (void *) lpcb);
 538         case 0x0004: /* query PCI function group */
 539                 return clp_pci_query_grp(req, (void *) lpcb);
 540         default:
 541                 return -EINVAL;
 542         }
 543 }
 544
 545 static int clp_normal_command(struct clp_req *req)
 546 {
 547         struct clp_req_hdr *lpcb;
 548         void __user *uptr;
 549         int rc;
 550
 551         rc = -EINVAL;
 552         if (req->lps != 0 && req->lps != 2)
 553                 goto out;
 554
 555         rc = -ENOMEM;
 556         lpcb = clp_alloc_block(GFP_KERNEL);
 557         if (!lpcb)
 558                 goto out;
 559
 560         rc = -EFAULT;
 561         uptr = (void __force __user *)(unsigned long) req->data_p;
 562         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 563                 goto out_free;
 564
 565         rc = -EINVAL;
 566         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 567                 goto out_free;
 568
 569         switch (req->lps) {
 570         case 0:
 571                 rc = clp_base_command(req, lpcb);
 572                 break;
 573         case 2:
 574                 rc = clp_pci_command(req, lpcb);
 575                 break;
 576         }
 577         if (rc)
 578                 goto out_free;
 579
 580         rc = -EFAULT;
 581         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 582                 goto out_free;
 583
 584         rc = 0;
 585
 586 out_free:
 587         clp_free_block(lpcb);
 588 out:
 589         return rc;
 590 }
 591
 592 static int clp_immediate_command(struct clp_req *req)
 593 {
 594         void __user *uptr;
 595         unsigned long ilp;
 596         int exists;
 597
 598         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 599                 return -EINVAL;
 600
 601         uptr = (void __force __user *)(unsigned long) req->data_p;
 602         if (req->cmd == 0) {
 603                 /* Command code 0: test for a specific processor */
 604                 exists = test_bit_inv(req->lps, &ilp);
 605                 return put_user(exists, (int __user *) uptr);
 606         }
 607         /* Command code 1: return bit mask of installed processors */
 608         return put_user(ilp, (unsigned long __user *) uptr);
 609 }
 610
 611 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 612                            unsigned long arg)
 613 {
 614         struct clp_req req;
 615         void __user *argp;
 616
 617         if (cmd != CLP_SYNC)
 618                 return -EINVAL;
 619
 620         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 621         if (copy_from_user(&req, argp, sizeof(req)))
 622                 return -EFAULT;
 623         if (req.r != 0)
 624                 return -EINVAL;
 625         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 626 }
 627
 628 static int clp_misc_release(struct inode *inode, struct file *filp)
 629 {
 630         return 0;
 631 }
 632
 633 static const struct file_operations clp_misc_fops = {
 634         .owner = THIS_MODULE,
 635         .open = nonseekable_open,
 636         .release = clp_misc_release,
 637         .unlocked_ioctl = clp_misc_ioctl,
 638         .compat_ioctl = clp_misc_ioctl,
 639         .llseek = no_llseek,
 640 };
 641
 642 static struct miscdevice clp_misc_device = {
 643         .minor = MISC_DYNAMIC_MINOR,
 644         .name = "clp",
 645         .fops = &clp_misc_fops,
 646 };
 647
 648 static int __init clp_misc_init(void)
 649 {
 650         return misc_register(&clp_misc_device);
 651 }
 652
 653 device_initcall(clp_misc_init);