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  * Enable/Disable a given PCI function and update its function handle if
 218  * necessary
 219  */
 220 static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
 221 {
 222         struct clp_req_rsp_set_pci *rrb;
 223         int rc, retries = 100;
 224         u32 fid = zdev->fid;
 225
 226         rrb = clp_alloc_block(GFP_KERNEL);
 227         if (!rrb)
 228                 return -ENOMEM;
 229
 230         do {
 231                 memset(rrb, 0, sizeof(*rrb));
 232                 rrb->request.hdr.len = sizeof(rrb->request);
 233                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 234                 rrb->response.hdr.len = sizeof(rrb->response);
 235                 rrb->request.fh = zdev->fh;
 236                 rrb->request.oc = command;
 237                 rrb->request.ndas = nr_dma_as;
 238
 239                 rc = clp_req(rrb, CLP_LPS_PCI);
 240                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 241                         retries--;
 242                         if (retries < 0)
 243                                 break;
 244                         msleep(20);
 245                 }
 246         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 247
 248         if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 249                 zpci_err("Set PCI FN:\n");
 250                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 251         }
 252
 253         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 254                 zdev->fh = rrb->response.fh;
 255         } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
 256                         rrb->response.fh == 0) {
 257                 /* Function is already in desired state - update handle */
 258                 rc = clp_refresh_fh(fid);
 259         }
 260         clp_free_block(rrb);
 261         return rc;
 262 }
 263
 264 int clp_setup_writeback_mio(void)
 265 {
 266         struct clp_req_rsp_slpc_pci *rrb;
 267         u8  wb_bit_pos;
 268         int rc;
 269
 270         rrb = clp_alloc_block(GFP_KERNEL);
 271         if (!rrb)
 272                 return -ENOMEM;
 273
 274         memset(rrb, 0, sizeof(*rrb));
 275         rrb->request.hdr.len = sizeof(rrb->request);
 276         rrb->request.hdr.cmd = CLP_SLPC;
 277         rrb->response.hdr.len = sizeof(rrb->response);
 278
 279         rc = clp_req(rrb, CLP_LPS_PCI);
 280         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 281                 if (rrb->response.vwb) {
 282                         wb_bit_pos = rrb->response.mio_wb;
 283                         set_bit_inv(wb_bit_pos, &mio_wb_bit_mask);
 284                         zpci_dbg(3, "wb bit: %d\n", wb_bit_pos);
 285                 } else {
 286                         zpci_dbg(3, "wb bit: n.a.\n");
 287                 }
 288
 289         } else {
 290                 zpci_err("SLPC PCI:\n");
 291                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 292                 rc = -EIO;
 293         }
 294         clp_free_block(rrb);
 295         return rc;
 296 }
 297
 298 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 299 {
 300         int rc;
 301
 302         rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 303         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 304         if (rc)
 305                 goto out;
 306
 307         if (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 out:
 315         return rc;
 316 }
 317
 318 int clp_disable_fh(struct zpci_dev *zdev)
 319 {
 320         int rc;
 321
 322         if (!zdev_enabled(zdev))
 323                 return 0;
 324
 325         rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
 326         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 327         return rc;
 328 }
 329
 330 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
 331                         void (*cb)(struct clp_fh_list_entry *, void *))
 332 {
 333         u64 resume_token = 0;
 334         int entries, i, rc;
 335
 336         do {
 337                 memset(rrb, 0, sizeof(*rrb));
 338                 rrb->request.hdr.len = sizeof(rrb->request);
 339                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 340                 /* store as many entries as possible */
 341                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 342                 rrb->request.resume_token = resume_token;
 343
 344                 /* Get PCI function handle list */
 345                 rc = clp_req(rrb, CLP_LPS_PCI);
 346                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 347                         zpci_err("List PCI FN:\n");
 348                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 349                         rc = -EIO;
 350                         goto out;
 351                 }
 352
 353                 update_uid_checking(rrb->response.uid_checking);
 354                 WARN_ON_ONCE(rrb->response.entry_size !=
 355                         sizeof(struct clp_fh_list_entry));
 356
 357                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 358                         rrb->response.entry_size;
 359
 360                 resume_token = rrb->response.resume_token;
 361                 for (i = 0; i < entries; i++)
 362                         cb(&rrb->response.fh_list[i], data);
 363         } while (resume_token);
 364 out:
 365         return rc;
 366 }
 367
 368 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 369 {
 370         struct zpci_dev *zdev;
 371
 372         if (!entry->vendor_id)
 373                 return;
 374
 375         zdev = get_zdev_by_fid(entry->fid);
 376         if (!zdev)
 377                 zpci_create_device(entry->fid, entry->fh, entry->config_state);
 378 }
 379
 380 int clp_scan_pci_devices(void)
 381 {
 382         struct clp_req_rsp_list_pci *rrb;
 383         int rc;
 384
 385         rrb = clp_alloc_block(GFP_KERNEL);
 386         if (!rrb)
 387                 return -ENOMEM;
 388
 389         rc = clp_list_pci(rrb, NULL, __clp_add);
 390
 391         clp_free_block(rrb);
 392         return rc;
 393 }
 394
 395 static void __clp_refresh_fh(struct clp_fh_list_entry *entry, void *data)
 396 {
 397         struct zpci_dev *zdev;
 398         u32 fid = *((u32 *)data);
 399
 400         if (!entry->vendor_id || fid != entry->fid)
 401                 return;
 402
 403         zdev = get_zdev_by_fid(fid);
 404         if (!zdev)
 405                 return;
 406
 407         zdev->fh = entry->fh;
 408 }
 409
 410 /*
 411  * Refresh the function handle of the function matching @fid
 412  */
 413 static int clp_refresh_fh(u32 fid)
 414 {
 415         struct clp_req_rsp_list_pci *rrb;
 416         int rc;
 417
 418         rrb = clp_alloc_block(GFP_NOWAIT);
 419         if (!rrb)
 420                 return -ENOMEM;
 421
 422         rc = clp_list_pci(rrb, &fid, __clp_refresh_fh);
 423
 424         clp_free_block(rrb);
 425         return rc;
 426 }
 427
 428 struct clp_state_data {
 429         u32 fid;
 430         enum zpci_state state;
 431 };
 432
 433 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
 434 {
 435         struct clp_state_data *sd = data;
 436
 437         if (entry->fid != sd->fid)
 438                 return;
 439
 440         sd->state = entry->config_state;
 441 }
 442
 443 int clp_get_state(u32 fid, enum zpci_state *state)
 444 {
 445         struct clp_req_rsp_list_pci *rrb;
 446         struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 447         int rc;
 448
 449         rrb = clp_alloc_block(GFP_ATOMIC);
 450         if (!rrb)
 451                 return -ENOMEM;
 452
 453         rc = clp_list_pci(rrb, &sd, __clp_get_state);
 454         if (!rc)
 455                 *state = sd.state;
 456
 457         clp_free_block(rrb);
 458         return rc;
 459 }
 460
 461 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 462 {
 463         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 464
 465         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 466             lpcb->response.hdr.len > limit)
 467                 return -EINVAL;
 468         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 469 }
 470
 471 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 472 {
 473         switch (lpcb->cmd) {
 474         case 0x0001: /* store logical-processor characteristics */
 475                 return clp_base_slpc(req, (void *) lpcb);
 476         default:
 477                 return -EINVAL;
 478         }
 479 }
 480
 481 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_pci *lpcb)
 482 {
 483         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 484
 485         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 486             lpcb->response.hdr.len > limit)
 487                 return -EINVAL;
 488         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 489 }
 490
 491 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 492 {
 493         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 494
 495         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 496             lpcb->response.hdr.len > limit)
 497                 return -EINVAL;
 498         if (lpcb->request.reserved2 != 0)
 499                 return -EINVAL;
 500         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 501 }
 502
 503 static int clp_pci_query(struct clp_req *req,
 504                          struct clp_req_rsp_query_pci *lpcb)
 505 {
 506         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 507
 508         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 509             lpcb->response.hdr.len > limit)
 510                 return -EINVAL;
 511         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 512                 return -EINVAL;
 513         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 514 }
 515
 516 static int clp_pci_query_grp(struct clp_req *req,
 517                              struct clp_req_rsp_query_pci_grp *lpcb)
 518 {
 519         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 520
 521         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 522             lpcb->response.hdr.len > limit)
 523                 return -EINVAL;
 524         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 525             lpcb->request.reserved4 != 0)
 526                 return -EINVAL;
 527         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 528 }
 529
 530 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 531 {
 532         switch (lpcb->cmd) {
 533         case 0x0001: /* store logical-processor characteristics */
 534                 return clp_pci_slpc(req, (void *) lpcb);
 535         case 0x0002: /* list PCI functions */
 536                 return clp_pci_list(req, (void *) lpcb);
 537         case 0x0003: /* query PCI function */
 538                 return clp_pci_query(req, (void *) lpcb);
 539         case 0x0004: /* query PCI function group */
 540                 return clp_pci_query_grp(req, (void *) lpcb);
 541         default:
 542                 return -EINVAL;
 543         }
 544 }
 545
 546 static int clp_normal_command(struct clp_req *req)
 547 {
 548         struct clp_req_hdr *lpcb;
 549         void __user *uptr;
 550         int rc;
 551
 552         rc = -EINVAL;
 553         if (req->lps != 0 && req->lps != 2)
 554                 goto out;
 555
 556         rc = -ENOMEM;
 557         lpcb = clp_alloc_block(GFP_KERNEL);
 558         if (!lpcb)
 559                 goto out;
 560
 561         rc = -EFAULT;
 562         uptr = (void __force __user *)(unsigned long) req->data_p;
 563         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 564                 goto out_free;
 565
 566         rc = -EINVAL;
 567         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 568                 goto out_free;
 569
 570         switch (req->lps) {
 571         case 0:
 572                 rc = clp_base_command(req, lpcb);
 573                 break;
 574         case 2:
 575                 rc = clp_pci_command(req, lpcb);
 576                 break;
 577         }
 578         if (rc)
 579                 goto out_free;
 580
 581         rc = -EFAULT;
 582         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 583                 goto out_free;
 584
 585         rc = 0;
 586
 587 out_free:
 588         clp_free_block(lpcb);
 589 out:
 590         return rc;
 591 }
 592
 593 static int clp_immediate_command(struct clp_req *req)
 594 {
 595         void __user *uptr;
 596         unsigned long ilp;
 597         int exists;
 598
 599         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 600                 return -EINVAL;
 601
 602         uptr = (void __force __user *)(unsigned long) req->data_p;
 603         if (req->cmd == 0) {
 604                 /* Command code 0: test for a specific processor */
 605                 exists = test_bit_inv(req->lps, &ilp);
 606                 return put_user(exists, (int __user *) uptr);
 607         }
 608         /* Command code 1: return bit mask of installed processors */
 609         return put_user(ilp, (unsigned long __user *) uptr);
 610 }
 611
 612 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 613                            unsigned long arg)
 614 {
 615         struct clp_req req;
 616         void __user *argp;
 617
 618         if (cmd != CLP_SYNC)
 619                 return -EINVAL;
 620
 621         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 622         if (copy_from_user(&req, argp, sizeof(req)))
 623                 return -EFAULT;
 624         if (req.r != 0)
 625                 return -EINVAL;
 626         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 627 }
 628
 629 static int clp_misc_release(struct inode *inode, struct file *filp)
 630 {
 631         return 0;
 632 }
 633
 634 static const struct file_operations clp_misc_fops = {
 635         .owner = THIS_MODULE,
 636         .open = nonseekable_open,
 637         .release = clp_misc_release,
 638         .unlocked_ioctl = clp_misc_ioctl,
 639         .compat_ioctl = clp_misc_ioctl,
 640         .llseek = no_llseek,
 641 };
 642
 643 static struct miscdevice clp_misc_device = {
 644         .minor = MISC_DYNAMIC_MINOR,
 645         .name = "clp",
 646         .fops = &clp_misc_fops,
 647 };
 648
 649 static int __init clp_misc_init(void)
 650 {
 651         return misc_register(&clp_misc_device);
 652 }
 653
 654 device_initcall(clp_misc_init);