1 // SPDX-License-Identifier: GPL-2.0 2 3 #define pr_fmt(fmt) "papr-scm: " fmt 4 5 #include <linux/of.h> 6 #include <linux/kernel.h> 7 #include <linux/module.h> 8 #include <linux/ioport.h> 9 #include <linux/slab.h> 10 #include <linux/ndctl.h> 11 #include <linux/sched.h> 12 #include <linux/libnvdimm.h> 13 #include <linux/platform_device.h> 14 #include <linux/delay.h> 15 #include <linux/seq_buf.h> 16 #include <linux/nd.h> 17 18 #include <asm/plpar_wrappers.h> 19 #include <asm/papr_pdsm.h> 20 #include <asm/mce.h> 21 #include <asm/unaligned.h> 22 23 #define BIND_ANY_ADDR (~0ul) 24 25 #define PAPR_SCM_DIMM_CMD_MASK \ 26 ((1ul << ND_CMD_GET_CONFIG_SIZE) | \ 27 (1ul << ND_CMD_GET_CONFIG_DATA) | \ 28 (1ul << ND_CMD_SET_CONFIG_DATA) | \ 29 (1ul << ND_CMD_CALL)) 30 31 /* DIMM health bitmap bitmap indicators */ 32 /* SCM device is unable to persist memory contents */ 33 #define PAPR_PMEM_UNARMED (1ULL << (63 - 0)) 34 /* SCM device failed to persist memory contents */ 35 #define PAPR_PMEM_SHUTDOWN_DIRTY (1ULL << (63 - 1)) 36 /* SCM device contents are persisted from previous IPL */ 37 #define PAPR_PMEM_SHUTDOWN_CLEAN (1ULL << (63 - 2)) 38 /* SCM device contents are not persisted from previous IPL */ 39 #define PAPR_PMEM_EMPTY (1ULL << (63 - 3)) 40 /* SCM device memory life remaining is critically low */ 41 #define PAPR_PMEM_HEALTH_CRITICAL (1ULL << (63 - 4)) 42 /* SCM device will be garded off next IPL due to failure */ 43 #define PAPR_PMEM_HEALTH_FATAL (1ULL << (63 - 5)) 44 /* SCM contents cannot persist due to current platform health status */ 45 #define PAPR_PMEM_HEALTH_UNHEALTHY (1ULL << (63 - 6)) 46 /* SCM device is unable to persist memory contents in certain conditions */ 47 #define PAPR_PMEM_HEALTH_NON_CRITICAL (1ULL << (63 - 7)) 48 /* SCM device is encrypted */ 49 #define PAPR_PMEM_ENCRYPTED (1ULL << (63 - 8)) 50 /* SCM device has been scrubbed and locked */ 51 #define PAPR_PMEM_SCRUBBED_AND_LOCKED (1ULL << (63 - 9)) 52 53 /* Bits status indicators for health bitmap indicating unarmed dimm */ 54 #define PAPR_PMEM_UNARMED_MASK (PAPR_PMEM_UNARMED | \ 55 PAPR_PMEM_HEALTH_UNHEALTHY) 56 57 /* Bits status indicators for health bitmap indicating unflushed dimm */ 58 #define PAPR_PMEM_BAD_SHUTDOWN_MASK (PAPR_PMEM_SHUTDOWN_DIRTY) 59 60 /* Bits status indicators for health bitmap indicating unrestored dimm */ 61 #define PAPR_PMEM_BAD_RESTORE_MASK (PAPR_PMEM_EMPTY) 62 63 /* Bit status indicators for smart event notification */ 64 #define PAPR_PMEM_SMART_EVENT_MASK (PAPR_PMEM_HEALTH_CRITICAL | \ 65 PAPR_PMEM_HEALTH_FATAL | \ 66 PAPR_PMEM_HEALTH_UNHEALTHY) 67 68 #define PAPR_SCM_PERF_STATS_EYECATCHER __stringify(SCMSTATS) 69 #define PAPR_SCM_PERF_STATS_VERSION 0x1 70 71 /* Struct holding a single performance metric */ 72 struct papr_scm_perf_stat { 73 u8 stat_id[8]; 74 __be64 stat_val; 75 } __packed; 76 77 /* Struct exchanged between kernel and PHYP for fetching drc perf stats */ 78 struct papr_scm_perf_stats { 79 u8 eye_catcher[8]; 80 /* Should be PAPR_SCM_PERF_STATS_VERSION */ 81 __be32 stats_version; 82 /* Number of stats following */ 83 __be32 num_statistics; 84 /* zero or more performance matrics */ 85 struct papr_scm_perf_stat scm_statistic[]; 86 } __packed; 87 88 /* private struct associated with each region */ 89 struct papr_scm_priv { 90 struct platform_device *pdev; 91 struct device_node *dn; 92 uint32_t drc_index; 93 uint64_t blocks; 94 uint64_t block_size; 95 int metadata_size; 96 bool is_volatile; 97 bool hcall_flush_required; 98 99 uint64_t bound_addr; 100 101 struct nvdimm_bus_descriptor bus_desc; 102 struct nvdimm_bus *bus; 103 struct nvdimm *nvdimm; 104 struct resource res; 105 struct nd_region *region; 106 struct nd_interleave_set nd_set; 107 struct list_head region_list; 108 109 /* Protect dimm health data from concurrent read/writes */ 110 struct mutex health_mutex; 111 112 /* Last time the health information of the dimm was updated */ 113 unsigned long lasthealth_jiffies; 114 115 /* Health information for the dimm */ 116 u64 health_bitmap; 117 118 /* Holds the last known dirty shutdown counter value */ 119 u64 dirty_shutdown_counter; 120 121 /* length of the stat buffer as expected by phyp */ 122 size_t stat_buffer_len; 123 }; 124 125 static int papr_scm_pmem_flush(struct nd_region *nd_region, 126 struct bio *bio __maybe_unused) 127 { 128 struct papr_scm_priv *p = nd_region_provider_data(nd_region); 129 unsigned long ret_buf[PLPAR_HCALL_BUFSIZE], token = 0; 130 long rc; 131 132 dev_dbg(&p->pdev->dev, "flush drc 0x%x", p->drc_index); 133 134 do { 135 rc = plpar_hcall(H_SCM_FLUSH, ret_buf, p->drc_index, token); 136 token = ret_buf[0]; 137 138 /* Check if we are stalled for some time */ 139 if (H_IS_LONG_BUSY(rc)) { 140 msleep(get_longbusy_msecs(rc)); 141 rc = H_BUSY; 142 } else if (rc == H_BUSY) { 143 cond_resched(); 144 } 145 } while (rc == H_BUSY); 146 147 if (rc) { 148 dev_err(&p->pdev->dev, "flush error: %ld", rc); 149 rc = -EIO; 150 } else { 151 dev_dbg(&p->pdev->dev, "flush drc 0x%x complete", p->drc_index); 152 } 153 154 return rc; 155 } 156 157 static LIST_HEAD(papr_nd_regions); 158 static DEFINE_MUTEX(papr_ndr_lock); 159 160 static int drc_pmem_bind(struct papr_scm_priv *p) 161 { 162 unsigned long ret[PLPAR_HCALL_BUFSIZE]; 163 uint64_t saved = 0; 164 uint64_t token; 165 int64_t rc; 166 167 /* 168 * When the hypervisor cannot map all the requested memory in a single 169 * hcall it returns H_BUSY and we call again with the token until 170 * we get H_SUCCESS. Aborting the retry loop before getting H_SUCCESS 171 * leave the system in an undefined state, so we wait. 172 */ 173 token = 0; 174 175 do { 176 rc = plpar_hcall(H_SCM_BIND_MEM, ret, p->drc_index, 0, 177 p->blocks, BIND_ANY_ADDR, token); 178 token = ret[0]; 179 if (!saved) 180 saved = ret[1]; 181 cond_resched(); 182 } while (rc == H_BUSY); 183 184 if (rc) 185 return rc; 186 187 p->bound_addr = saved; 188 dev_dbg(&p->pdev->dev, "bound drc 0x%x to 0x%lx\n", 189 p->drc_index, (unsigned long)saved); 190 return rc; 191 } 192 193 static void drc_pmem_unbind(struct papr_scm_priv *p) 194 { 195 unsigned long ret[PLPAR_HCALL_BUFSIZE]; 196 uint64_t token = 0; 197 int64_t rc; 198 199 dev_dbg(&p->pdev->dev, "unbind drc 0x%x\n", p->drc_index); 200 201 /* NB: unbind has the same retry requirements as drc_pmem_bind() */ 202 do { 203 204 /* Unbind of all SCM resources associated with drcIndex */ 205 rc = plpar_hcall(H_SCM_UNBIND_ALL, ret, H_UNBIND_SCOPE_DRC, 206 p->drc_index, token); 207 token = ret[0]; 208 209 /* Check if we are stalled for some time */ 210 if (H_IS_LONG_BUSY(rc)) { 211 msleep(get_longbusy_msecs(rc)); 212 rc = H_BUSY; 213 } else if (rc == H_BUSY) { 214 cond_resched(); 215 } 216 217 } while (rc == H_BUSY); 218 219 if (rc) 220 dev_err(&p->pdev->dev, "unbind error: %lld\n", rc); 221 else 222 dev_dbg(&p->pdev->dev, "unbind drc 0x%x complete\n", 223 p->drc_index); 224 225 return; 226 } 227 228 static int drc_pmem_query_n_bind(struct papr_scm_priv *p) 229 { 230 unsigned long start_addr; 231 unsigned long end_addr; 232 unsigned long ret[PLPAR_HCALL_BUFSIZE]; 233 int64_t rc; 234 235 236 rc = plpar_hcall(H_SCM_QUERY_BLOCK_MEM_BINDING, ret, 237 p->drc_index, 0); 238 if (rc) 239 goto err_out; 240 start_addr = ret[0]; 241 242 /* Make sure the full region is bound. */ 243 rc = plpar_hcall(H_SCM_QUERY_BLOCK_MEM_BINDING, ret, 244 p->drc_index, p->blocks - 1); 245 if (rc) 246 goto err_out; 247 end_addr = ret[0]; 248 249 if ((end_addr - start_addr) != ((p->blocks - 1) * p->block_size)) 250 goto err_out; 251 252 p->bound_addr = start_addr; 253 dev_dbg(&p->pdev->dev, "bound drc 0x%x to 0x%lx\n", p->drc_index, start_addr); 254 return rc; 255 256 err_out: 257 dev_info(&p->pdev->dev, 258 "Failed to query, trying an unbind followed by bind"); 259 drc_pmem_unbind(p); 260 return drc_pmem_bind(p); 261 } 262 263 /* 264 * Query the Dimm performance stats from PHYP and copy them (if returned) to 265 * provided struct papr_scm_perf_stats instance 'stats' that can hold atleast 266 * (num_stats + header) bytes. 267 * - If buff_stats == NULL the return value is the size in bytes of the buffer 268 * needed to hold all supported performance-statistics. 269 * - If buff_stats != NULL and num_stats == 0 then we copy all known 270 * performance-statistics to 'buff_stat' and expect to be large enough to 271 * hold them. 272 * - if buff_stats != NULL and num_stats > 0 then copy the requested 273 * performance-statistics to buff_stats. 274 */ 275 static ssize_t drc_pmem_query_stats(struct papr_scm_priv *p, 276 struct papr_scm_perf_stats *buff_stats, 277 unsigned int num_stats) 278 { 279 unsigned long ret[PLPAR_HCALL_BUFSIZE]; 280 size_t size; 281 s64 rc; 282 283 /* Setup the out buffer */ 284 if (buff_stats) { 285 memcpy(buff_stats->eye_catcher, 286 PAPR_SCM_PERF_STATS_EYECATCHER, 8); 287 buff_stats->stats_version = 288 cpu_to_be32(PAPR_SCM_PERF_STATS_VERSION); 289 buff_stats->num_statistics = 290 cpu_to_be32(num_stats); 291 292 /* 293 * Calculate the buffer size based on num-stats provided 294 * or use the prefetched max buffer length 295 */ 296 if (num_stats) 297 /* Calculate size from the num_stats */ 298 size = sizeof(struct papr_scm_perf_stats) + 299 num_stats * sizeof(struct papr_scm_perf_stat); 300 else 301 size = p->stat_buffer_len; 302 } else { 303 /* In case of no out buffer ignore the size */ 304 size = 0; 305 } 306 307 /* Do the HCALL asking PHYP for info */ 308 rc = plpar_hcall(H_SCM_PERFORMANCE_STATS, ret, p->drc_index, 309 buff_stats ? virt_to_phys(buff_stats) : 0, 310 size); 311 312 /* Check if the error was due to an unknown stat-id */ 313 if (rc == H_PARTIAL) { 314 dev_err(&p->pdev->dev, 315 "Unknown performance stats, Err:0x%016lX\n", ret[0]); 316 return -ENOENT; 317 } else if (rc == H_AUTHORITY) { 318 dev_info(&p->pdev->dev, 319 "Permission denied while accessing performance stats"); 320 return -EPERM; 321 } else if (rc == H_UNSUPPORTED) { 322 dev_dbg(&p->pdev->dev, "Performance stats unsupported\n"); 323 return -EOPNOTSUPP; 324 } else if (rc != H_SUCCESS) { 325 dev_err(&p->pdev->dev, 326 "Failed to query performance stats, Err:%lld\n", rc); 327 return -EIO; 328 329 } else if (!size) { 330 /* Handle case where stat buffer size was requested */ 331 dev_dbg(&p->pdev->dev, 332 "Performance stats size %ld\n", ret[0]); 333 return ret[0]; 334 } 335 336 /* Successfully fetched the requested stats from phyp */ 337 dev_dbg(&p->pdev->dev, 338 "Performance stats returned %d stats\n", 339 be32_to_cpu(buff_stats->num_statistics)); 340 return 0; 341 } 342 343 /* 344 * Issue hcall to retrieve dimm health info and populate papr_scm_priv with the 345 * health information. 346 */ 347 static int __drc_pmem_query_health(struct papr_scm_priv *p) 348 { 349 unsigned long ret[PLPAR_HCALL_BUFSIZE]; 350 long rc; 351 352 /* issue the hcall */ 353 rc = plpar_hcall(H_SCM_HEALTH, ret, p->drc_index); 354 if (rc != H_SUCCESS) { 355 dev_err(&p->pdev->dev, 356 "Failed to query health information, Err:%ld\n", rc); 357 return -ENXIO; 358 } 359 360 p->lasthealth_jiffies = jiffies; 361 p->health_bitmap = ret[0] & ret[1]; 362 363 dev_dbg(&p->pdev->dev, 364 "Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n", 365 ret[0], ret[1]); 366 367 return 0; 368 } 369 370 /* Min interval in seconds for assuming stable dimm health */ 371 #define MIN_HEALTH_QUERY_INTERVAL 60 372 373 /* Query cached health info and if needed call drc_pmem_query_health */ 374 static int drc_pmem_query_health(struct papr_scm_priv *p) 375 { 376 unsigned long cache_timeout; 377 int rc; 378 379 /* Protect concurrent modifications to papr_scm_priv */ 380 rc = mutex_lock_interruptible(&p->health_mutex); 381 if (rc) 382 return rc; 383 384 /* Jiffies offset for which the health data is assumed to be same */ 385 cache_timeout = p->lasthealth_jiffies + 386 msecs_to_jiffies(MIN_HEALTH_QUERY_INTERVAL * 1000); 387 388 /* Fetch new health info is its older than MIN_HEALTH_QUERY_INTERVAL */ 389 if (time_after(jiffies, cache_timeout)) 390 rc = __drc_pmem_query_health(p); 391 else 392 /* Assume cached health data is valid */ 393 rc = 0; 394 395 mutex_unlock(&p->health_mutex); 396 return rc; 397 } 398 399 static int papr_scm_meta_get(struct papr_scm_priv *p, 400 struct nd_cmd_get_config_data_hdr *hdr) 401 { 402 unsigned long data[PLPAR_HCALL_BUFSIZE]; 403 unsigned long offset, data_offset; 404 int len, read; 405 int64_t ret; 406 407 if ((hdr->in_offset + hdr->in_length) > p->metadata_size) 408 return -EINVAL; 409 410 for (len = hdr->in_length; len; len -= read) { 411 412 data_offset = hdr->in_length - len; 413 offset = hdr->in_offset + data_offset; 414 415 if (len >= 8) 416 read = 8; 417 else if (len >= 4) 418 read = 4; 419 else if (len >= 2) 420 read = 2; 421 else 422 read = 1; 423 424 ret = plpar_hcall(H_SCM_READ_METADATA, data, p->drc_index, 425 offset, read); 426 427 if (ret == H_PARAMETER) /* bad DRC index */ 428 return -ENODEV; 429 if (ret) 430 return -EINVAL; /* other invalid parameter */ 431 432 switch (read) { 433 case 8: 434 *(uint64_t *)(hdr->out_buf + data_offset) = be64_to_cpu(data[0]); 435 break; 436 case 4: 437 *(uint32_t *)(hdr->out_buf + data_offset) = be32_to_cpu(data[0] & 0xffffffff); 438 break; 439 440 case 2: 441 *(uint16_t *)(hdr->out_buf + data_offset) = be16_to_cpu(data[0] & 0xffff); 442 break; 443 444 case 1: 445 *(uint8_t *)(hdr->out_buf + data_offset) = (data[0] & 0xff); 446 break; 447 } 448 } 449 return 0; 450 } 451 452 static int papr_scm_meta_set(struct papr_scm_priv *p, 453 struct nd_cmd_set_config_hdr *hdr) 454 { 455 unsigned long offset, data_offset; 456 int len, wrote; 457 unsigned long data; 458 __be64 data_be; 459 int64_t ret; 460 461 if ((hdr->in_offset + hdr->in_length) > p->metadata_size) 462 return -EINVAL; 463 464 for (len = hdr->in_length; len; len -= wrote) { 465 466 data_offset = hdr->in_length - len; 467 offset = hdr->in_offset + data_offset; 468 469 if (len >= 8) { 470 data = *(uint64_t *)(hdr->in_buf + data_offset); 471 data_be = cpu_to_be64(data); 472 wrote = 8; 473 } else if (len >= 4) { 474 data = *(uint32_t *)(hdr->in_buf + data_offset); 475 data &= 0xffffffff; 476 data_be = cpu_to_be32(data); 477 wrote = 4; 478 } else if (len >= 2) { 479 data = *(uint16_t *)(hdr->in_buf + data_offset); 480 data &= 0xffff; 481 data_be = cpu_to_be16(data); 482 wrote = 2; 483 } else { 484 data_be = *(uint8_t *)(hdr->in_buf + data_offset); 485 data_be &= 0xff; 486 wrote = 1; 487 } 488 489 ret = plpar_hcall_norets(H_SCM_WRITE_METADATA, p->drc_index, 490 offset, data_be, wrote); 491 if (ret == H_PARAMETER) /* bad DRC index */ 492 return -ENODEV; 493 if (ret) 494 return -EINVAL; /* other invalid parameter */ 495 } 496 497 return 0; 498 } 499 500 /* 501 * Do a sanity checks on the inputs args to dimm-control function and return 502 * '0' if valid. Validation of PDSM payloads happens later in 503 * papr_scm_service_pdsm. 504 */ 505 static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf, 506 unsigned int buf_len) 507 { 508 unsigned long cmd_mask = PAPR_SCM_DIMM_CMD_MASK; 509 struct nd_cmd_pkg *nd_cmd; 510 struct papr_scm_priv *p; 511 enum papr_pdsm pdsm; 512 513 /* Only dimm-specific calls are supported atm */ 514 if (!nvdimm) 515 return -EINVAL; 516 517 /* get the provider data from struct nvdimm */ 518 p = nvdimm_provider_data(nvdimm); 519 520 if (!test_bit(cmd, &cmd_mask)) { 521 dev_dbg(&p->pdev->dev, "Unsupported cmd=%u\n", cmd); 522 return -EINVAL; 523 } 524 525 /* For CMD_CALL verify pdsm request */ 526 if (cmd == ND_CMD_CALL) { 527 /* Verify the envelope and envelop size */ 528 if (!buf || 529 buf_len < (sizeof(struct nd_cmd_pkg) + ND_PDSM_HDR_SIZE)) { 530 dev_dbg(&p->pdev->dev, "Invalid pkg size=%u\n", 531 buf_len); 532 return -EINVAL; 533 } 534 535 /* Verify that the nd_cmd_pkg.nd_family is correct */ 536 nd_cmd = (struct nd_cmd_pkg *)buf; 537 538 if (nd_cmd->nd_family != NVDIMM_FAMILY_PAPR) { 539 dev_dbg(&p->pdev->dev, "Invalid pkg family=0x%llx\n", 540 nd_cmd->nd_family); 541 return -EINVAL; 542 } 543 544 pdsm = (enum papr_pdsm)nd_cmd->nd_command; 545 546 /* Verify if the pdsm command is valid */ 547 if (pdsm <= PAPR_PDSM_MIN || pdsm >= PAPR_PDSM_MAX) { 548 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid PDSM\n", 549 pdsm); 550 return -EINVAL; 551 } 552 553 /* Have enough space to hold returned 'nd_pkg_pdsm' header */ 554 if (nd_cmd->nd_size_out < ND_PDSM_HDR_SIZE) { 555 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid payload\n", 556 pdsm); 557 return -EINVAL; 558 } 559 } 560 561 /* Let the command be further processed */ 562 return 0; 563 } 564 565 static int papr_pdsm_fuel_gauge(struct papr_scm_priv *p, 566 union nd_pdsm_payload *payload) 567 { 568 int rc, size; 569 u64 statval; 570 struct papr_scm_perf_stat *stat; 571 struct papr_scm_perf_stats *stats; 572 573 /* Silently fail if fetching performance metrics isn't supported */ 574 if (!p->stat_buffer_len) 575 return 0; 576 577 /* Allocate request buffer enough to hold single performance stat */ 578 size = sizeof(struct papr_scm_perf_stats) + 579 sizeof(struct papr_scm_perf_stat); 580 581 stats = kzalloc(size, GFP_KERNEL); 582 if (!stats) 583 return -ENOMEM; 584 585 stat = &stats->scm_statistic[0]; 586 memcpy(&stat->stat_id, "MemLife ", sizeof(stat->stat_id)); 587 stat->stat_val = 0; 588 589 /* Fetch the fuel gauge and populate it in payload */ 590 rc = drc_pmem_query_stats(p, stats, 1); 591 if (rc < 0) { 592 dev_dbg(&p->pdev->dev, "Err(%d) fetching fuel gauge\n", rc); 593 goto free_stats; 594 } 595 596 statval = be64_to_cpu(stat->stat_val); 597 dev_dbg(&p->pdev->dev, 598 "Fetched fuel-gauge %llu", statval); 599 payload->health.extension_flags |= 600 PDSM_DIMM_HEALTH_RUN_GAUGE_VALID; 601 payload->health.dimm_fuel_gauge = statval; 602 603 rc = sizeof(struct nd_papr_pdsm_health); 604 605 free_stats: 606 kfree(stats); 607 return rc; 608 } 609 610 /* Add the dirty-shutdown-counter value to the pdsm */ 611 static int papr_pdsm_dsc(struct papr_scm_priv *p, 612 union nd_pdsm_payload *payload) 613 { 614 payload->health.extension_flags |= PDSM_DIMM_DSC_VALID; 615 payload->health.dimm_dsc = p->dirty_shutdown_counter; 616 617 return sizeof(struct nd_papr_pdsm_health); 618 } 619 620 /* Fetch the DIMM health info and populate it in provided package. */ 621 static int papr_pdsm_health(struct papr_scm_priv *p, 622 union nd_pdsm_payload *payload) 623 { 624 int rc; 625 626 /* Ensure dimm health mutex is taken preventing concurrent access */ 627 rc = mutex_lock_interruptible(&p->health_mutex); 628 if (rc) 629 goto out; 630 631 /* Always fetch upto date dimm health data ignoring cached values */ 632 rc = __drc_pmem_query_health(p); 633 if (rc) { 634 mutex_unlock(&p->health_mutex); 635 goto out; 636 } 637 638 /* update health struct with various flags derived from health bitmap */ 639 payload->health = (struct nd_papr_pdsm_health) { 640 .extension_flags = 0, 641 .dimm_unarmed = !!(p->health_bitmap & PAPR_PMEM_UNARMED_MASK), 642 .dimm_bad_shutdown = !!(p->health_bitmap & PAPR_PMEM_BAD_SHUTDOWN_MASK), 643 .dimm_bad_restore = !!(p->health_bitmap & PAPR_PMEM_BAD_RESTORE_MASK), 644 .dimm_scrubbed = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED), 645 .dimm_locked = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED), 646 .dimm_encrypted = !!(p->health_bitmap & PAPR_PMEM_ENCRYPTED), 647 .dimm_health = PAPR_PDSM_DIMM_HEALTHY, 648 }; 649 650 /* Update field dimm_health based on health_bitmap flags */ 651 if (p->health_bitmap & PAPR_PMEM_HEALTH_FATAL) 652 payload->health.dimm_health = PAPR_PDSM_DIMM_FATAL; 653 else if (p->health_bitmap & PAPR_PMEM_HEALTH_CRITICAL) 654 payload->health.dimm_health = PAPR_PDSM_DIMM_CRITICAL; 655 else if (p->health_bitmap & PAPR_PMEM_HEALTH_UNHEALTHY) 656 payload->health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY; 657 658 /* struct populated hence can release the mutex now */ 659 mutex_unlock(&p->health_mutex); 660 661 /* Populate the fuel gauge meter in the payload */ 662 papr_pdsm_fuel_gauge(p, payload); 663 /* Populate the dirty-shutdown-counter field */ 664 papr_pdsm_dsc(p, payload); 665 666 rc = sizeof(struct nd_papr_pdsm_health); 667 668 out: 669 return rc; 670 } 671 672 /* 673 * 'struct pdsm_cmd_desc' 674 * Identifies supported PDSMs' expected length of in/out payloads 675 * and pdsm service function. 676 * 677 * size_in : Size of input payload if any in the PDSM request. 678 * size_out : Size of output payload if any in the PDSM request. 679 * service : Service function for the PDSM request. Return semantics: 680 * rc < 0 : Error servicing PDSM and rc indicates the error. 681 * rc >=0 : Serviced successfully and 'rc' indicate number of 682 * bytes written to payload. 683 */ 684 struct pdsm_cmd_desc { 685 u32 size_in; 686 u32 size_out; 687 int (*service)(struct papr_scm_priv *dimm, 688 union nd_pdsm_payload *payload); 689 }; 690 691 /* Holds all supported PDSMs' command descriptors */ 692 static const struct pdsm_cmd_desc __pdsm_cmd_descriptors[] = { 693 [PAPR_PDSM_MIN] = { 694 .size_in = 0, 695 .size_out = 0, 696 .service = NULL, 697 }, 698 /* New PDSM command descriptors to be added below */ 699 700 [PAPR_PDSM_HEALTH] = { 701 .size_in = 0, 702 .size_out = sizeof(struct nd_papr_pdsm_health), 703 .service = papr_pdsm_health, 704 }, 705 /* Empty */ 706 [PAPR_PDSM_MAX] = { 707 .size_in = 0, 708 .size_out = 0, 709 .service = NULL, 710 }, 711 }; 712 713 /* Given a valid pdsm cmd return its command descriptor else return NULL */ 714 static inline const struct pdsm_cmd_desc *pdsm_cmd_desc(enum papr_pdsm cmd) 715 { 716 if (cmd >= 0 || cmd < ARRAY_SIZE(__pdsm_cmd_descriptors)) 717 return &__pdsm_cmd_descriptors[cmd]; 718 719 return NULL; 720 } 721 722 /* 723 * For a given pdsm request call an appropriate service function. 724 * Returns errors if any while handling the pdsm command package. 725 */ 726 static int papr_scm_service_pdsm(struct papr_scm_priv *p, 727 struct nd_cmd_pkg *pkg) 728 { 729 /* Get the PDSM header and PDSM command */ 730 struct nd_pkg_pdsm *pdsm_pkg = (struct nd_pkg_pdsm *)pkg->nd_payload; 731 enum papr_pdsm pdsm = (enum papr_pdsm)pkg->nd_command; 732 const struct pdsm_cmd_desc *pdsc; 733 int rc; 734 735 /* Fetch corresponding pdsm descriptor for validation and servicing */ 736 pdsc = pdsm_cmd_desc(pdsm); 737 738 /* Validate pdsm descriptor */ 739 /* Ensure that reserved fields are 0 */ 740 if (pdsm_pkg->reserved[0] || pdsm_pkg->reserved[1]) { 741 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid reserved field\n", 742 pdsm); 743 return -EINVAL; 744 } 745 746 /* If pdsm expects some input, then ensure that the size_in matches */ 747 if (pdsc->size_in && 748 pkg->nd_size_in != (pdsc->size_in + ND_PDSM_HDR_SIZE)) { 749 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Mismatched size_in=%d\n", 750 pdsm, pkg->nd_size_in); 751 return -EINVAL; 752 } 753 754 /* If pdsm wants to return data, then ensure that size_out matches */ 755 if (pdsc->size_out && 756 pkg->nd_size_out != (pdsc->size_out + ND_PDSM_HDR_SIZE)) { 757 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Mismatched size_out=%d\n", 758 pdsm, pkg->nd_size_out); 759 return -EINVAL; 760 } 761 762 /* Service the pdsm */ 763 if (pdsc->service) { 764 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Servicing..\n", pdsm); 765 766 rc = pdsc->service(p, &pdsm_pkg->payload); 767 768 if (rc < 0) { 769 /* error encountered while servicing pdsm */ 770 pdsm_pkg->cmd_status = rc; 771 pkg->nd_fw_size = ND_PDSM_HDR_SIZE; 772 } else { 773 /* pdsm serviced and 'rc' bytes written to payload */ 774 pdsm_pkg->cmd_status = 0; 775 pkg->nd_fw_size = ND_PDSM_HDR_SIZE + rc; 776 } 777 } else { 778 dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Unsupported PDSM request\n", 779 pdsm); 780 pdsm_pkg->cmd_status = -ENOENT; 781 pkg->nd_fw_size = ND_PDSM_HDR_SIZE; 782 } 783 784 return pdsm_pkg->cmd_status; 785 } 786 787 static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, 788 struct nvdimm *nvdimm, unsigned int cmd, void *buf, 789 unsigned int buf_len, int *cmd_rc) 790 { 791 struct nd_cmd_get_config_size *get_size_hdr; 792 struct nd_cmd_pkg *call_pkg = NULL; 793 struct papr_scm_priv *p; 794 int rc; 795 796 rc = is_cmd_valid(nvdimm, cmd, buf, buf_len); 797 if (rc) { 798 pr_debug("Invalid cmd=0x%x. Err=%d\n", cmd, rc); 799 return rc; 800 } 801 802 /* Use a local variable in case cmd_rc pointer is NULL */ 803 if (!cmd_rc) 804 cmd_rc = &rc; 805 806 p = nvdimm_provider_data(nvdimm); 807 808 switch (cmd) { 809 case ND_CMD_GET_CONFIG_SIZE: 810 get_size_hdr = buf; 811 812 get_size_hdr->status = 0; 813 get_size_hdr->max_xfer = 8; 814 get_size_hdr->config_size = p->metadata_size; 815 *cmd_rc = 0; 816 break; 817 818 case ND_CMD_GET_CONFIG_DATA: 819 *cmd_rc = papr_scm_meta_get(p, buf); 820 break; 821 822 case ND_CMD_SET_CONFIG_DATA: 823 *cmd_rc = papr_scm_meta_set(p, buf); 824 break; 825 826 case ND_CMD_CALL: 827 call_pkg = (struct nd_cmd_pkg *)buf; 828 *cmd_rc = papr_scm_service_pdsm(p, call_pkg); 829 break; 830 831 default: 832 dev_dbg(&p->pdev->dev, "Unknown command = %d\n", cmd); 833 return -EINVAL; 834 } 835 836 dev_dbg(&p->pdev->dev, "returned with cmd_rc = %d\n", *cmd_rc); 837 838 return 0; 839 } 840 841 static ssize_t perf_stats_show(struct device *dev, 842 struct device_attribute *attr, char *buf) 843 { 844 int index; 845 ssize_t rc; 846 struct seq_buf s; 847 struct papr_scm_perf_stat *stat; 848 struct papr_scm_perf_stats *stats; 849 struct nvdimm *dimm = to_nvdimm(dev); 850 struct papr_scm_priv *p = nvdimm_provider_data(dimm); 851 852 if (!p->stat_buffer_len) 853 return -ENOENT; 854 855 /* Allocate the buffer for phyp where stats are written */ 856 stats = kzalloc(p->stat_buffer_len, GFP_KERNEL); 857 if (!stats) 858 return -ENOMEM; 859 860 /* Ask phyp to return all dimm perf stats */ 861 rc = drc_pmem_query_stats(p, stats, 0); 862 if (rc) 863 goto free_stats; 864 /* 865 * Go through the returned output buffer and print stats and 866 * values. Since stat_id is essentially a char string of 867 * 8 bytes, simply use the string format specifier to print it. 868 */ 869 seq_buf_init(&s, buf, PAGE_SIZE); 870 for (index = 0, stat = stats->scm_statistic; 871 index < be32_to_cpu(stats->num_statistics); 872 ++index, ++stat) { 873 seq_buf_printf(&s, "%.8s = 0x%016llX\n", 874 stat->stat_id, 875 be64_to_cpu(stat->stat_val)); 876 } 877 878 free_stats: 879 kfree(stats); 880 return rc ? rc : (ssize_t)seq_buf_used(&s); 881 } 882 static DEVICE_ATTR_ADMIN_RO(perf_stats); 883 884 static ssize_t flags_show(struct device *dev, 885 struct device_attribute *attr, char *buf) 886 { 887 struct nvdimm *dimm = to_nvdimm(dev); 888 struct papr_scm_priv *p = nvdimm_provider_data(dimm); 889 struct seq_buf s; 890 u64 health; 891 int rc; 892 893 rc = drc_pmem_query_health(p); 894 if (rc) 895 return rc; 896 897 /* Copy health_bitmap locally, check masks & update out buffer */ 898 health = READ_ONCE(p->health_bitmap); 899 900 seq_buf_init(&s, buf, PAGE_SIZE); 901 if (health & PAPR_PMEM_UNARMED_MASK) 902 seq_buf_printf(&s, "not_armed "); 903 904 if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK) 905 seq_buf_printf(&s, "flush_fail "); 906 907 if (health & PAPR_PMEM_BAD_RESTORE_MASK) 908 seq_buf_printf(&s, "restore_fail "); 909 910 if (health & PAPR_PMEM_ENCRYPTED) 911 seq_buf_printf(&s, "encrypted "); 912 913 if (health & PAPR_PMEM_SMART_EVENT_MASK) 914 seq_buf_printf(&s, "smart_notify "); 915 916 if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED) 917 seq_buf_printf(&s, "scrubbed locked "); 918 919 if (seq_buf_used(&s)) 920 seq_buf_printf(&s, "\n"); 921 922 return seq_buf_used(&s); 923 } 924 DEVICE_ATTR_RO(flags); 925 926 static ssize_t dirty_shutdown_show(struct device *dev, 927 struct device_attribute *attr, char *buf) 928 { 929 struct nvdimm *dimm = to_nvdimm(dev); 930 struct papr_scm_priv *p = nvdimm_provider_data(dimm); 931 932 return sysfs_emit(buf, "%llu\n", p->dirty_shutdown_counter); 933 } 934 DEVICE_ATTR_RO(dirty_shutdown); 935 936 static umode_t papr_nd_attribute_visible(struct kobject *kobj, 937 struct attribute *attr, int n) 938 { 939 struct device *dev = kobj_to_dev(kobj); 940 struct nvdimm *nvdimm = to_nvdimm(dev); 941 struct papr_scm_priv *p = nvdimm_provider_data(nvdimm); 942 943 /* For if perf-stats not available remove perf_stats sysfs */ 944 if (attr == &dev_attr_perf_stats.attr && p->stat_buffer_len == 0) 945 return 0; 946 947 return attr->mode; 948 } 949 950 /* papr_scm specific dimm attributes */ 951 static struct attribute *papr_nd_attributes[] = { 952 &dev_attr_flags.attr, 953 &dev_attr_perf_stats.attr, 954 &dev_attr_dirty_shutdown.attr, 955 NULL, 956 }; 957 958 static struct attribute_group papr_nd_attribute_group = { 959 .name = "papr", 960 .is_visible = papr_nd_attribute_visible, 961 .attrs = papr_nd_attributes, 962 }; 963 964 static const struct attribute_group *papr_nd_attr_groups[] = { 965 &papr_nd_attribute_group, 966 NULL, 967 }; 968 969 static int papr_scm_nvdimm_init(struct papr_scm_priv *p) 970 { 971 struct device *dev = &p->pdev->dev; 972 struct nd_mapping_desc mapping; 973 struct nd_region_desc ndr_desc; 974 unsigned long dimm_flags; 975 int target_nid, online_nid; 976 977 p->bus_desc.ndctl = papr_scm_ndctl; 978 p->bus_desc.module = THIS_MODULE; 979 p->bus_desc.of_node = p->pdev->dev.of_node; 980 p->bus_desc.provider_name = kstrdup(p->pdev->name, GFP_KERNEL); 981 982 /* Set the dimm command family mask to accept PDSMs */ 983 set_bit(NVDIMM_FAMILY_PAPR, &p->bus_desc.dimm_family_mask); 984 985 if (!p->bus_desc.provider_name) 986 return -ENOMEM; 987 988 p->bus = nvdimm_bus_register(NULL, &p->bus_desc); 989 if (!p->bus) { 990 dev_err(dev, "Error creating nvdimm bus %pOF\n", p->dn); 991 kfree(p->bus_desc.provider_name); 992 return -ENXIO; 993 } 994 995 dimm_flags = 0; 996 set_bit(NDD_LABELING, &dimm_flags); 997 998 /* 999 * Check if the nvdimm is unarmed. No locking needed as we are still 1000 * initializing. Ignore error encountered if any. 1001 */ 1002 __drc_pmem_query_health(p); 1003 1004 if (p->health_bitmap & PAPR_PMEM_UNARMED_MASK) 1005 set_bit(NDD_UNARMED, &dimm_flags); 1006 1007 p->nvdimm = nvdimm_create(p->bus, p, papr_nd_attr_groups, 1008 dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL); 1009 if (!p->nvdimm) { 1010 dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn); 1011 goto err; 1012 } 1013 1014 if (nvdimm_bus_check_dimm_count(p->bus, 1)) 1015 goto err; 1016 1017 /* now add the region */ 1018 1019 memset(&mapping, 0, sizeof(mapping)); 1020 mapping.nvdimm = p->nvdimm; 1021 mapping.start = 0; 1022 mapping.size = p->blocks * p->block_size; // XXX: potential overflow? 1023 1024 memset(&ndr_desc, 0, sizeof(ndr_desc)); 1025 target_nid = dev_to_node(&p->pdev->dev); 1026 online_nid = numa_map_to_online_node(target_nid); 1027 ndr_desc.numa_node = online_nid; 1028 ndr_desc.target_node = target_nid; 1029 ndr_desc.res = &p->res; 1030 ndr_desc.of_node = p->dn; 1031 ndr_desc.provider_data = p; 1032 ndr_desc.mapping = &mapping; 1033 ndr_desc.num_mappings = 1; 1034 ndr_desc.nd_set = &p->nd_set; 1035 1036 if (p->hcall_flush_required) { 1037 set_bit(ND_REGION_ASYNC, &ndr_desc.flags); 1038 ndr_desc.flush = papr_scm_pmem_flush; 1039 } 1040 1041 if (p->is_volatile) 1042 p->region = nvdimm_volatile_region_create(p->bus, &ndr_desc); 1043 else { 1044 set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags); 1045 p->region = nvdimm_pmem_region_create(p->bus, &ndr_desc); 1046 } 1047 if (!p->region) { 1048 dev_err(dev, "Error registering region %pR from %pOF\n", 1049 ndr_desc.res, p->dn); 1050 goto err; 1051 } 1052 if (target_nid != online_nid) 1053 dev_info(dev, "Region registered with target node %d and online node %d", 1054 target_nid, online_nid); 1055 1056 mutex_lock(&papr_ndr_lock); 1057 list_add_tail(&p->region_list, &papr_nd_regions); 1058 mutex_unlock(&papr_ndr_lock); 1059 1060 return 0; 1061 1062 err: nvdimm_bus_unregister(p->bus); 1063 kfree(p->bus_desc.provider_name); 1064 return -ENXIO; 1065 } 1066 1067 static void papr_scm_add_badblock(struct nd_region *region, 1068 struct nvdimm_bus *bus, u64 phys_addr) 1069 { 1070 u64 aligned_addr = ALIGN_DOWN(phys_addr, L1_CACHE_BYTES); 1071 1072 if (nvdimm_bus_add_badrange(bus, aligned_addr, L1_CACHE_BYTES)) { 1073 pr_err("Bad block registration for 0x%llx failed\n", phys_addr); 1074 return; 1075 } 1076 1077 pr_debug("Add memory range (0x%llx - 0x%llx) as bad range\n", 1078 aligned_addr, aligned_addr + L1_CACHE_BYTES); 1079 1080 nvdimm_region_notify(region, NVDIMM_REVALIDATE_POISON); 1081 } 1082 1083 static int handle_mce_ue(struct notifier_block *nb, unsigned long val, 1084 void *data) 1085 { 1086 struct machine_check_event *evt = data; 1087 struct papr_scm_priv *p; 1088 u64 phys_addr; 1089 bool found = false; 1090 1091 if (evt->error_type != MCE_ERROR_TYPE_UE) 1092 return NOTIFY_DONE; 1093 1094 if (list_empty(&papr_nd_regions)) 1095 return NOTIFY_DONE; 1096 1097 /* 1098 * The physical address obtained here is PAGE_SIZE aligned, so get the 1099 * exact address from the effective address 1100 */ 1101 phys_addr = evt->u.ue_error.physical_address + 1102 (evt->u.ue_error.effective_address & ~PAGE_MASK); 1103 1104 if (!evt->u.ue_error.physical_address_provided || 1105 !is_zone_device_page(pfn_to_page(phys_addr >> PAGE_SHIFT))) 1106 return NOTIFY_DONE; 1107 1108 /* mce notifier is called from a process context, so mutex is safe */ 1109 mutex_lock(&papr_ndr_lock); 1110 list_for_each_entry(p, &papr_nd_regions, region_list) { 1111 if (phys_addr >= p->res.start && phys_addr <= p->res.end) { 1112 found = true; 1113 break; 1114 } 1115 } 1116 1117 if (found) 1118 papr_scm_add_badblock(p->region, p->bus, phys_addr); 1119 1120 mutex_unlock(&papr_ndr_lock); 1121 1122 return found ? NOTIFY_OK : NOTIFY_DONE; 1123 } 1124 1125 static struct notifier_block mce_ue_nb = { 1126 .notifier_call = handle_mce_ue 1127 }; 1128 1129 static int papr_scm_probe(struct platform_device *pdev) 1130 { 1131 struct device_node *dn = pdev->dev.of_node; 1132 u32 drc_index, metadata_size; 1133 u64 blocks, block_size; 1134 struct papr_scm_priv *p; 1135 u8 uuid_raw[UUID_SIZE]; 1136 const char *uuid_str; 1137 ssize_t stat_size; 1138 uuid_t uuid; 1139 int rc; 1140 1141 /* check we have all the required DT properties */ 1142 if (of_property_read_u32(dn, "ibm,my-drc-index", &drc_index)) { 1143 dev_err(&pdev->dev, "%pOF: missing drc-index!\n", dn); 1144 return -ENODEV; 1145 } 1146 1147 if (of_property_read_u64(dn, "ibm,block-size", &block_size)) { 1148 dev_err(&pdev->dev, "%pOF: missing block-size!\n", dn); 1149 return -ENODEV; 1150 } 1151 1152 if (of_property_read_u64(dn, "ibm,number-of-blocks", &blocks)) { 1153 dev_err(&pdev->dev, "%pOF: missing number-of-blocks!\n", dn); 1154 return -ENODEV; 1155 } 1156 1157 if (of_property_read_string(dn, "ibm,unit-guid", &uuid_str)) { 1158 dev_err(&pdev->dev, "%pOF: missing unit-guid!\n", dn); 1159 return -ENODEV; 1160 } 1161 1162 1163 p = kzalloc(sizeof(*p), GFP_KERNEL); 1164 if (!p) 1165 return -ENOMEM; 1166 1167 /* Initialize the dimm mutex */ 1168 mutex_init(&p->health_mutex); 1169 1170 /* optional DT properties */ 1171 of_property_read_u32(dn, "ibm,metadata-size", &metadata_size); 1172 1173 p->dn = dn; 1174 p->drc_index = drc_index; 1175 p->block_size = block_size; 1176 p->blocks = blocks; 1177 p->is_volatile = !of_property_read_bool(dn, "ibm,cache-flush-required"); 1178 p->hcall_flush_required = of_property_read_bool(dn, "ibm,hcall-flush-required"); 1179 1180 if (of_property_read_u64(dn, "ibm,persistence-failed-count", 1181 &p->dirty_shutdown_counter)) 1182 p->dirty_shutdown_counter = 0; 1183 1184 /* We just need to ensure that set cookies are unique across */ 1185 uuid_parse(uuid_str, &uuid); 1186 1187 /* 1188 * The cookie1 and cookie2 are not really little endian. 1189 * We store a raw buffer representation of the 1190 * uuid string so that we can compare this with the label 1191 * area cookie irrespective of the endian configuration 1192 * with which the kernel is built. 1193 * 1194 * Historically we stored the cookie in the below format. 1195 * for a uuid string 72511b67-0b3b-42fd-8d1d-5be3cae8bcaa 1196 * cookie1 was 0xfd423b0b671b5172 1197 * cookie2 was 0xaabce8cae35b1d8d 1198 */ 1199 export_uuid(uuid_raw, &uuid); 1200 p->nd_set.cookie1 = get_unaligned_le64(&uuid_raw[0]); 1201 p->nd_set.cookie2 = get_unaligned_le64(&uuid_raw[8]); 1202 1203 /* might be zero */ 1204 p->metadata_size = metadata_size; 1205 p->pdev = pdev; 1206 1207 /* request the hypervisor to bind this region to somewhere in memory */ 1208 rc = drc_pmem_bind(p); 1209 1210 /* If phyp says drc memory still bound then force unbound and retry */ 1211 if (rc == H_OVERLAP) 1212 rc = drc_pmem_query_n_bind(p); 1213 1214 if (rc != H_SUCCESS) { 1215 dev_err(&p->pdev->dev, "bind err: %d\n", rc); 1216 rc = -ENXIO; 1217 goto err; 1218 } 1219 1220 /* setup the resource for the newly bound range */ 1221 p->res.start = p->bound_addr; 1222 p->res.end = p->bound_addr + p->blocks * p->block_size - 1; 1223 p->res.name = pdev->name; 1224 p->res.flags = IORESOURCE_MEM; 1225 1226 /* Try retrieving the stat buffer and see if its supported */ 1227 stat_size = drc_pmem_query_stats(p, NULL, 0); 1228 if (stat_size > 0) { 1229 p->stat_buffer_len = stat_size; 1230 dev_dbg(&p->pdev->dev, "Max perf-stat size %lu-bytes\n", 1231 p->stat_buffer_len); 1232 } 1233 1234 rc = papr_scm_nvdimm_init(p); 1235 if (rc) 1236 goto err2; 1237 1238 platform_set_drvdata(pdev, p); 1239 1240 return 0; 1241 1242 err2: drc_pmem_unbind(p); 1243 err: kfree(p); 1244 return rc; 1245 } 1246 1247 static int papr_scm_remove(struct platform_device *pdev) 1248 { 1249 struct papr_scm_priv *p = platform_get_drvdata(pdev); 1250 1251 mutex_lock(&papr_ndr_lock); 1252 list_del(&p->region_list); 1253 mutex_unlock(&papr_ndr_lock); 1254 1255 nvdimm_bus_unregister(p->bus); 1256 drc_pmem_unbind(p); 1257 kfree(p->bus_desc.provider_name); 1258 kfree(p); 1259 1260 return 0; 1261 } 1262 1263 static const struct of_device_id papr_scm_match[] = { 1264 { .compatible = "ibm,pmemory" }, 1265 { .compatible = "ibm,pmemory-v2" }, 1266 { }, 1267 }; 1268 1269 static struct platform_driver papr_scm_driver = { 1270 .probe = papr_scm_probe, 1271 .remove = papr_scm_remove, 1272 .driver = { 1273 .name = "papr_scm", 1274 .of_match_table = papr_scm_match, 1275 }, 1276 }; 1277 1278 static int __init papr_scm_init(void) 1279 { 1280 int ret; 1281 1282 ret = platform_driver_register(&papr_scm_driver); 1283 if (!ret) 1284 mce_register_notifier(&mce_ue_nb); 1285 1286 return ret; 1287 } 1288 module_init(papr_scm_init); 1289 1290 static void __exit papr_scm_exit(void) 1291 { 1292 mce_unregister_notifier(&mce_ue_nb); 1293 platform_driver_unregister(&papr_scm_driver); 1294 } 1295 module_exit(papr_scm_exit); 1296 1297 MODULE_DEVICE_TABLE(of, papr_scm_match); 1298 MODULE_LICENSE("GPL"); 1299 MODULE_AUTHOR("IBM Corporation"); 1300