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 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
 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 = 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 int clp_add_pci_device(u32 fid, u32 fh, int configured)
 216 {
 217         struct zpci_dev *zdev;
 218         int rc = -ENOMEM;
 219
 220         zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
 221         zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
 222         if (!zdev)
 223                 goto error;
 224
 225         zdev->fh = fh;
 226         zdev->fid = fid;
 227
 228         /* Query function properties and update zdev */
 229         rc = clp_query_pci_fn(zdev, fh);
 230         if (rc)
 231                 goto error;
 232
 233         if (configured)
 234                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
 235         else
 236                 zdev->state = ZPCI_FN_STATE_STANDBY;
 237
 238         rc = zpci_create_device(zdev);
 239         if (rc)
 240                 goto error;
 241         return 0;
 242
 243 error:
 244         zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
 245         kfree(zdev);
 246         return rc;
 247 }
 248
 249 static int clp_refresh_fh(u32 fid);
 250 /*
 251  * Enable/Disable a given PCI function and update its function handle if
 252  * necessary
 253  */
 254 static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
 255 {
 256         struct clp_req_rsp_set_pci *rrb;
 257         int rc, retries = 100;
 258         u32 fid = zdev->fid;
 259
 260         rrb = clp_alloc_block(GFP_KERNEL);
 261         if (!rrb)
 262                 return -ENOMEM;
 263
 264         do {
 265                 memset(rrb, 0, sizeof(*rrb));
 266                 rrb->request.hdr.len = sizeof(rrb->request);
 267                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 268                 rrb->response.hdr.len = sizeof(rrb->response);
 269                 rrb->request.fh = zdev->fh;
 270                 rrb->request.oc = command;
 271                 rrb->request.ndas = nr_dma_as;
 272
 273                 rc = clp_req(rrb, CLP_LPS_PCI);
 274                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 275                         retries--;
 276                         if (retries < 0)
 277                                 break;
 278                         msleep(20);
 279                 }
 280         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 281
 282         if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 283                 zpci_err("Set PCI FN:\n");
 284                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 285         }
 286
 287         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 288                 zdev->fh = rrb->response.fh;
 289         } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
 290                         rrb->response.fh == 0) {
 291                 /* Function is already in desired state - update handle */
 292                 rc = clp_refresh_fh(fid);
 293         }
 294         clp_free_block(rrb);
 295         return rc;
 296 }
 297
 298 int clp_setup_writeback_mio(void)
 299 {
 300         struct clp_req_rsp_slpc_pci *rrb;
 301         u8  wb_bit_pos;
 302         int rc;
 303
 304         rrb = clp_alloc_block(GFP_KERNEL);
 305         if (!rrb)
 306                 return -ENOMEM;
 307
 308         memset(rrb, 0, sizeof(*rrb));
 309         rrb->request.hdr.len = sizeof(rrb->request);
 310         rrb->request.hdr.cmd = CLP_SLPC;
 311         rrb->response.hdr.len = sizeof(rrb->response);
 312
 313         rc = clp_req(rrb, CLP_LPS_PCI);
 314         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 315                 if (rrb->response.vwb) {
 316                         wb_bit_pos = rrb->response.mio_wb;
 317                         set_bit_inv(wb_bit_pos, &mio_wb_bit_mask);
 318                         zpci_dbg(3, "wb bit: %d\n", wb_bit_pos);
 319                 } else {
 320                         zpci_dbg(3, "wb bit: n.a.\n");
 321                 }
 322
 323         } else {
 324                 zpci_err("SLPC PCI:\n");
 325                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 326                 rc = -EIO;
 327         }
 328         clp_free_block(rrb);
 329         return rc;
 330 }
 331
 332 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 333 {
 334         int rc;
 335
 336         rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 337         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 338         if (rc)
 339                 goto out;
 340
 341         if (zpci_use_mio(zdev)) {
 342                 rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
 343                 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
 344                                 zdev->fid, zdev->fh, rc);
 345                 if (rc)
 346                         clp_disable_fh(zdev);
 347         }
 348 out:
 349         return rc;
 350 }
 351
 352 int clp_disable_fh(struct zpci_dev *zdev)
 353 {
 354         int rc;
 355
 356         if (!zdev_enabled(zdev))
 357                 return 0;
 358
 359         rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
 360         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 361         return rc;
 362 }
 363
 364 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
 365                         void (*cb)(struct clp_fh_list_entry *, void *))
 366 {
 367         u64 resume_token = 0;
 368         int entries, i, rc;
 369
 370         do {
 371                 memset(rrb, 0, sizeof(*rrb));
 372                 rrb->request.hdr.len = sizeof(rrb->request);
 373                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 374                 /* store as many entries as possible */
 375                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 376                 rrb->request.resume_token = resume_token;
 377
 378                 /* Get PCI function handle list */
 379                 rc = clp_req(rrb, CLP_LPS_PCI);
 380                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 381                         zpci_err("List PCI FN:\n");
 382                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 383                         rc = -EIO;
 384                         goto out;
 385                 }
 386
 387                 update_uid_checking(rrb->response.uid_checking);
 388                 WARN_ON_ONCE(rrb->response.entry_size !=
 389                         sizeof(struct clp_fh_list_entry));
 390
 391                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 392                         rrb->response.entry_size;
 393
 394                 resume_token = rrb->response.resume_token;
 395                 for (i = 0; i < entries; i++)
 396                         cb(&rrb->response.fh_list[i], data);
 397         } while (resume_token);
 398 out:
 399         return rc;
 400 }
 401
 402 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 403 {
 404         struct zpci_dev *zdev;
 405
 406         if (!entry->vendor_id)
 407                 return;
 408
 409         zdev = get_zdev_by_fid(entry->fid);
 410         if (!zdev)
 411                 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 412 }
 413
 414 int clp_scan_pci_devices(void)
 415 {
 416         struct clp_req_rsp_list_pci *rrb;
 417         int rc;
 418
 419         rrb = clp_alloc_block(GFP_KERNEL);
 420         if (!rrb)
 421                 return -ENOMEM;
 422
 423         rc = clp_list_pci(rrb, NULL, __clp_add);
 424
 425         clp_free_block(rrb);
 426         return rc;
 427 }
 428
 429 static void __clp_refresh_fh(struct clp_fh_list_entry *entry, void *data)
 430 {
 431         struct zpci_dev *zdev;
 432         u32 fid = *((u32 *)data);
 433
 434         if (!entry->vendor_id || fid != entry->fid)
 435                 return;
 436
 437         zdev = get_zdev_by_fid(fid);
 438         if (!zdev)
 439                 return;
 440
 441         zdev->fh = entry->fh;
 442 }
 443
 444 /*
 445  * Refresh the function handle of the function matching @fid
 446  */
 447 static int clp_refresh_fh(u32 fid)
 448 {
 449         struct clp_req_rsp_list_pci *rrb;
 450         int rc;
 451
 452         rrb = clp_alloc_block(GFP_NOWAIT);
 453         if (!rrb)
 454                 return -ENOMEM;
 455
 456         rc = clp_list_pci(rrb, &fid, __clp_refresh_fh);
 457
 458         clp_free_block(rrb);
 459         return rc;
 460 }
 461
 462 struct clp_state_data {
 463         u32 fid;
 464         enum zpci_state state;
 465 };
 466
 467 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
 468 {
 469         struct clp_state_data *sd = data;
 470
 471         if (entry->fid != sd->fid)
 472                 return;
 473
 474         sd->state = entry->config_state;
 475 }
 476
 477 int clp_get_state(u32 fid, enum zpci_state *state)
 478 {
 479         struct clp_req_rsp_list_pci *rrb;
 480         struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 481         int rc;
 482
 483         rrb = clp_alloc_block(GFP_ATOMIC);
 484         if (!rrb)
 485                 return -ENOMEM;
 486
 487         rc = clp_list_pci(rrb, &sd, __clp_get_state);
 488         if (!rc)
 489                 *state = sd.state;
 490
 491         clp_free_block(rrb);
 492         return rc;
 493 }
 494
 495 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 496 {
 497         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 498
 499         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 500             lpcb->response.hdr.len > limit)
 501                 return -EINVAL;
 502         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 503 }
 504
 505 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 506 {
 507         switch (lpcb->cmd) {
 508         case 0x0001: /* store logical-processor characteristics */
 509                 return clp_base_slpc(req, (void *) lpcb);
 510         default:
 511                 return -EINVAL;
 512         }
 513 }
 514
 515 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_pci *lpcb)
 516 {
 517         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 518
 519         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 520             lpcb->response.hdr.len > limit)
 521                 return -EINVAL;
 522         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 523 }
 524
 525 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 526 {
 527         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 528
 529         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 530             lpcb->response.hdr.len > limit)
 531                 return -EINVAL;
 532         if (lpcb->request.reserved2 != 0)
 533                 return -EINVAL;
 534         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 535 }
 536
 537 static int clp_pci_query(struct clp_req *req,
 538                          struct clp_req_rsp_query_pci *lpcb)
 539 {
 540         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 541
 542         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 543             lpcb->response.hdr.len > limit)
 544                 return -EINVAL;
 545         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 546                 return -EINVAL;
 547         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 548 }
 549
 550 static int clp_pci_query_grp(struct clp_req *req,
 551                              struct clp_req_rsp_query_pci_grp *lpcb)
 552 {
 553         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 554
 555         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 556             lpcb->response.hdr.len > limit)
 557                 return -EINVAL;
 558         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 559             lpcb->request.reserved4 != 0)
 560                 return -EINVAL;
 561         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 562 }
 563
 564 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 565 {
 566         switch (lpcb->cmd) {
 567         case 0x0001: /* store logical-processor characteristics */
 568                 return clp_pci_slpc(req, (void *) lpcb);
 569         case 0x0002: /* list PCI functions */
 570                 return clp_pci_list(req, (void *) lpcb);
 571         case 0x0003: /* query PCI function */
 572                 return clp_pci_query(req, (void *) lpcb);
 573         case 0x0004: /* query PCI function group */
 574                 return clp_pci_query_grp(req, (void *) lpcb);
 575         default:
 576                 return -EINVAL;
 577         }
 578 }
 579
 580 static int clp_normal_command(struct clp_req *req)
 581 {
 582         struct clp_req_hdr *lpcb;
 583         void __user *uptr;
 584         int rc;
 585
 586         rc = -EINVAL;
 587         if (req->lps != 0 && req->lps != 2)
 588                 goto out;
 589
 590         rc = -ENOMEM;
 591         lpcb = clp_alloc_block(GFP_KERNEL);
 592         if (!lpcb)
 593                 goto out;
 594
 595         rc = -EFAULT;
 596         uptr = (void __force __user *)(unsigned long) req->data_p;
 597         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 598                 goto out_free;
 599
 600         rc = -EINVAL;
 601         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 602                 goto out_free;
 603
 604         switch (req->lps) {
 605         case 0:
 606                 rc = clp_base_command(req, lpcb);
 607                 break;
 608         case 2:
 609                 rc = clp_pci_command(req, lpcb);
 610                 break;
 611         }
 612         if (rc)
 613                 goto out_free;
 614
 615         rc = -EFAULT;
 616         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 617                 goto out_free;
 618
 619         rc = 0;
 620
 621 out_free:
 622         clp_free_block(lpcb);
 623 out:
 624         return rc;
 625 }
 626
 627 static int clp_immediate_command(struct clp_req *req)
 628 {
 629         void __user *uptr;
 630         unsigned long ilp;
 631         int exists;
 632
 633         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 634                 return -EINVAL;
 635
 636         uptr = (void __force __user *)(unsigned long) req->data_p;
 637         if (req->cmd == 0) {
 638                 /* Command code 0: test for a specific processor */
 639                 exists = test_bit_inv(req->lps, &ilp);
 640                 return put_user(exists, (int __user *) uptr);
 641         }
 642         /* Command code 1: return bit mask of installed processors */
 643         return put_user(ilp, (unsigned long __user *) uptr);
 644 }
 645
 646 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 647                            unsigned long arg)
 648 {
 649         struct clp_req req;
 650         void __user *argp;
 651
 652         if (cmd != CLP_SYNC)
 653                 return -EINVAL;
 654
 655         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 656         if (copy_from_user(&req, argp, sizeof(req)))
 657                 return -EFAULT;
 658         if (req.r != 0)
 659                 return -EINVAL;
 660         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 661 }
 662
 663 static int clp_misc_release(struct inode *inode, struct file *filp)
 664 {
 665         return 0;
 666 }
 667
 668 static const struct file_operations clp_misc_fops = {
 669         .owner = THIS_MODULE,
 670         .open = nonseekable_open,
 671         .release = clp_misc_release,
 672         .unlocked_ioctl = clp_misc_ioctl,
 673         .compat_ioctl = clp_misc_ioctl,
 674         .llseek = no_llseek,
 675 };
 676
 677 static struct miscdevice clp_misc_device = {
 678         .minor = MISC_DYNAMIC_MINOR,
 679         .name = "clp",
 680         .fops = &clp_misc_fops,
 681 };
 682
 683 static int __init clp_misc_init(void)
 684 {
 685         return misc_register(&clp_misc_device);
 686 }
 687
 688 device_initcall(clp_misc_init);