linux/arch/powerpc/platforms/pseries/papr_scm.c
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   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 */
  72struct 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 */
  78struct 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 */
  89struct 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
 125static 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
 157static LIST_HEAD(papr_nd_regions);
 158static DEFINE_MUTEX(papr_ndr_lock);
 159
 160static 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
 193static 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
 228static 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
 256err_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 */
 275static 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 */
 347static 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 */
 374static 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
 399static 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
 452static 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 */
 505static 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
 565static 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
 605free_stats:
 606        kfree(stats);
 607        return rc;
 608}
 609
 610/* Add the dirty-shutdown-counter value to the pdsm */
 611static 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. */
 621static 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
 668out:
 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 */
 684struct 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 */
 692static 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 */
 714static 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 */
 726static 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
 787static 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
 841static 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
 878free_stats:
 879        kfree(stats);
 880        return rc ? rc : (ssize_t)seq_buf_used(&s);
 881}
 882static DEVICE_ATTR_ADMIN_RO(perf_stats);
 883
 884static 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}
 924DEVICE_ATTR_RO(flags);
 925
 926static 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}
 934DEVICE_ATTR_RO(dirty_shutdown);
 935
 936static 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 */
 951static 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
 958static struct attribute_group papr_nd_attribute_group = {
 959        .name = "papr",
 960        .is_visible = papr_nd_attribute_visible,
 961        .attrs = papr_nd_attributes,
 962};
 963
 964static const struct attribute_group *papr_nd_attr_groups[] = {
 965        &papr_nd_attribute_group,
 966        NULL,
 967};
 968
 969static 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
1062err:    nvdimm_bus_unregister(p->bus);
1063        kfree(p->bus_desc.provider_name);
1064        return -ENXIO;
1065}
1066
1067static 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
1083static 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
1125static struct notifier_block mce_ue_nb = {
1126        .notifier_call = handle_mce_ue
1127};
1128
1129static 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
1242err2:   drc_pmem_unbind(p);
1243err:    kfree(p);
1244        return rc;
1245}
1246
1247static 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
1263static const struct of_device_id papr_scm_match[] = {
1264        { .compatible = "ibm,pmemory" },
1265        { .compatible = "ibm,pmemory-v2" },
1266        { },
1267};
1268
1269static 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
1278static 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}
1288module_init(papr_scm_init);
1289
1290static void __exit papr_scm_exit(void)
1291{
1292        mce_unregister_notifier(&mce_ue_nb);
1293        platform_driver_unregister(&papr_scm_driver);
1294}
1295module_exit(papr_scm_exit);
1296
1297MODULE_DEVICE_TABLE(of, papr_scm_match);
1298MODULE_LICENSE("GPL");
1299MODULE_AUTHOR("IBM Corporation");
1300
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