arch/s390/pci/pci_clp.c

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