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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
  */
 #include <linux/list_sort.h>
 #include <linux/libnvdimm.h>
 #include <linux/module.h>
 #include <linux/nospec.h>
 #include <linux/mutex.h>
 #include <linux/ndctl.h>
 #include <linux/sysfs.h>
 #include <linux/delay.h>
 #include <linux/list.h>
 #include <linux/acpi.h>
 #include <linux/sort.h>
 #include <linux/io.h>
 #include <linux/nd.h>
 #include <asm/cacheflush.h>
 #include <acpi/nfit.h>
 #include "intel.h"
 #include "nfit.h"
 
 /*
  * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
  * irrelevant.
  */
 #include <linux/io-64-nonatomic-hi-lo.h>
 
 static bool force_enable_dimms;
 module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
 
 static bool disable_vendor_specific;
 module_param(disable_vendor_specific, bool, S_IRUGO);
 MODULE_PARM_DESC(disable_vendor_specific,
         "Limit commands to the publicly specified set");
 
 static unsigned long override_dsm_mask;
 module_param(override_dsm_mask, ulong, S_IRUGO);
 MODULE_PARM_DESC(override_dsm_mask, "Bitmask of allowed NVDIMM DSM functions");
 
 static int default_dsm_family = -1;
 module_param(default_dsm_family, int, S_IRUGO);
 MODULE_PARM_DESC(default_dsm_family,
         "Try this DSM type first when identifying NVDIMM family");
 
 static bool no_init_ars;
 module_param(no_init_ars, bool, 0644);
 MODULE_PARM_DESC(no_init_ars, "Skip ARS run at nfit init time");
 
 static bool force_labels;
 module_param(force_labels, bool, 0444);
 MODULE_PARM_DESC(force_labels, "Opt-in to labels despite missing methods");
 
 LIST_HEAD(acpi_descs);
 DEFINE_MUTEX(acpi_desc_lock);
 
 static struct workqueue_struct *nfit_wq;
 
 struct nfit_table_prev {
     struct list_head spas;
     struct list_head memdevs;
     struct list_head dcrs;
     struct list_head bdws;
     struct list_head idts;
     struct list_head flushes;
 };
 
 static guid_t nfit_uuid[NFIT_UUID_MAX];
 
 const guid_t *to_nfit_uuid(enum nfit_uuids id)
 {
     return &nfit_uuid[id];
 }
 EXPORT_SYMBOL(to_nfit_uuid);
 
 static const guid_t *to_nfit_bus_uuid(int family)
 {
     if (WARN_ONCE(family == NVDIMM_BUS_FAMILY_NFIT,
             "only secondary bus families can be translated\n"))
         return NULL;
     /*
      * The index of bus UUIDs starts immediately following the last
      * NVDIMM/leaf family.
      */
     return to_nfit_uuid(family + NVDIMM_FAMILY_MAX);
 }
 
 static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
 {
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
 
     /*
      * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct
      * acpi_device.
      */
     if (!nd_desc->provider_name
             || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0)
         return NULL;
 
     return to_acpi_device(acpi_desc->dev);
 }
 
 static int xlat_bus_status(void *buf, unsigned int cmd, u32 status)
 {
     struct nd_cmd_clear_error *clear_err;
     struct nd_cmd_ars_status *ars_status;
     u16 flags;
 
     switch (cmd) {
     case ND_CMD_ARS_CAP:
         if ((status & 0xffff) == NFIT_ARS_CAP_NONE)
             return -ENOTTY;
 
         /* Command failed */
         if (status & 0xffff)
             return -EIO;
 
         /* No supported scan types for this range */
         flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
         if ((status >> 16 & flags) == 0)
             return -ENOTTY;
         return 0;
     case ND_CMD_ARS_START:
         /* ARS is in progress */
         if ((status & 0xffff) == NFIT_ARS_START_BUSY)
             return -EBUSY;
 
         /* Command failed */
         if (status & 0xffff)
             return -EIO;
         return 0;
     case ND_CMD_ARS_STATUS:
         ars_status = buf;
         /* Command failed */
         if (status & 0xffff)
             return -EIO;
         /* Check extended status (Upper two bytes) */
         if (status == NFIT_ARS_STATUS_DONE)
             return 0;
 
         /* ARS is in progress */
         if (status == NFIT_ARS_STATUS_BUSY)
             return -EBUSY;
 
         /* No ARS performed for the current boot */
         if (status == NFIT_ARS_STATUS_NONE)
             return -EAGAIN;
 
         /*
          * ARS interrupted, either we overflowed or some other
          * agent wants the scan to stop.  If we didn't overflow
          * then just continue with the returned results.
          */
         if (status == NFIT_ARS_STATUS_INTR) {
             if (ars_status->out_length >= 40 && (ars_status->flags
                         & NFIT_ARS_F_OVERFLOW))
                 return -ENOSPC;
             return 0;
         }
 
         /* Unknown status */
         if (status >> 16)
             return -EIO;
         return 0;
     case ND_CMD_CLEAR_ERROR:
         clear_err = buf;
         if (status & 0xffff)
             return -EIO;
         if (!clear_err->cleared)
             return -EIO;
         if (clear_err->length > clear_err->cleared)
             return clear_err->cleared;
         return 0;
     default:
         break;
     }
 
     /* all other non-zero status results in an error */
     if (status)
         return -EIO;
     return 0;
 }
 
 #define ACPI_LABELS_LOCKED 3
 
 static int xlat_nvdimm_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
         u32 status)
 {
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     switch (cmd) {
     case ND_CMD_GET_CONFIG_SIZE:
         /*
          * In the _LSI, _LSR, _LSW case the locked status is
          * communicated via the read/write commands
          */
         if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags))
             break;
 
         if (status >> 16 & ND_CONFIG_LOCKED)
             return -EACCES;
         break;
     case ND_CMD_GET_CONFIG_DATA:
         if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags)
                 && status == ACPI_LABELS_LOCKED)
             return -EACCES;
         break;
     case ND_CMD_SET_CONFIG_DATA:
         if (test_bit(NFIT_MEM_LSW, &nfit_mem->flags)
                 && status == ACPI_LABELS_LOCKED)
             return -EACCES;
         break;
     default:
         break;
     }
 
     /* all other non-zero status results in an error */
     if (status)
         return -EIO;
     return 0;
 }
 
 static int xlat_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
         u32 status)
 {
     if (!nvdimm)
         return xlat_bus_status(buf, cmd, status);
     return xlat_nvdimm_status(nvdimm, buf, cmd, status);
 }
 
 /* convert _LS{I,R} packages to the buffer object acpi_nfit_ctl expects */
 static union acpi_object *pkg_to_buf(union acpi_object *pkg)
 {
     int i;
     void *dst;
     size_t size = 0;
     union acpi_object *buf = NULL;
 
     if (pkg->type != ACPI_TYPE_PACKAGE) {
         WARN_ONCE(1, "BIOS bug, unexpected element type: %d\n",
                 pkg->type);
         goto err;
     }
 
     for (i = 0; i < pkg->package.count; i++) {
         union acpi_object *obj = &pkg->package.elements[i];
 
         if (obj->type == ACPI_TYPE_INTEGER)
             size += 4;
         else if (obj->type == ACPI_TYPE_BUFFER)
             size += obj->buffer.length;
         else {
             WARN_ONCE(1, "BIOS bug, unexpected element type: %d\n",
                     obj->type);
             goto err;
         }
     }
 
     buf = ACPI_ALLOCATE(sizeof(*buf) + size);
     if (!buf)
         goto err;
 
     dst = buf + 1;
     buf->type = ACPI_TYPE_BUFFER;
     buf->buffer.length = size;
     buf->buffer.pointer = dst;
     for (i = 0; i < pkg->package.count; i++) {
         union acpi_object *obj = &pkg->package.elements[i];
 
         if (obj->type == ACPI_TYPE_INTEGER) {
             memcpy(dst, &obj->integer.value, 4);
             dst += 4;
         } else if (obj->type == ACPI_TYPE_BUFFER) {
             memcpy(dst, obj->buffer.pointer, obj->buffer.length);
             dst += obj->buffer.length;
         }
     }
 err:
     ACPI_FREE(pkg);
     return buf;
 }
 
 static union acpi_object *int_to_buf(union acpi_object *integer)
 {
     union acpi_object *buf = NULL;
     void *dst = NULL;
 
     if (integer->type != ACPI_TYPE_INTEGER) {
         WARN_ONCE(1, "BIOS bug, unexpected element type: %d\n",
                 integer->type);
         goto err;
     }
 
     buf = ACPI_ALLOCATE(sizeof(*buf) + 4);
     if (!buf)
         goto err;
 
     dst = buf + 1;
     buf->type = ACPI_TYPE_BUFFER;
     buf->buffer.length = 4;
     buf->buffer.pointer = dst;
     memcpy(dst, &integer->integer.value, 4);
 err:
     ACPI_FREE(integer);
     return buf;
 }
 
 static union acpi_object *acpi_label_write(acpi_handle handle, u32 offset,
         u32 len, void *data)
 {
     acpi_status rc;
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
     struct acpi_object_list input = {
         .count = 3,
         .pointer = (union acpi_object []) {
             [0] = {
                 .integer.type = ACPI_TYPE_INTEGER,
                 .integer.value = offset,
             },
             [1] = {
                 .integer.type = ACPI_TYPE_INTEGER,
                 .integer.value = len,
             },
             [2] = {
                 .buffer.type = ACPI_TYPE_BUFFER,
                 .buffer.pointer = data,
                 .buffer.length = len,
             },
         },
     };
 
     rc = acpi_evaluate_object(handle, "_LSW", &input, &buf);
     if (ACPI_FAILURE(rc))
         return NULL;
     return int_to_buf(buf.pointer);
 }
 
 static union acpi_object *acpi_label_read(acpi_handle handle, u32 offset,
         u32 len)
 {
     acpi_status rc;
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
     struct acpi_object_list input = {
         .count = 2,
         .pointer = (union acpi_object []) {
             [0] = {
                 .integer.type = ACPI_TYPE_INTEGER,
                 .integer.value = offset,
             },
             [1] = {
                 .integer.type = ACPI_TYPE_INTEGER,
                 .integer.value = len,
             },
         },
     };
 
     rc = acpi_evaluate_object(handle, "_LSR", &input, &buf);
     if (ACPI_FAILURE(rc))
         return NULL;
     return pkg_to_buf(buf.pointer);
 }
 
 static union acpi_object *acpi_label_info(acpi_handle handle)
 {
     acpi_status rc;
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 
     rc = acpi_evaluate_object(handle, "_LSI", NULL, &buf);
     if (ACPI_FAILURE(rc))
         return NULL;
     return pkg_to_buf(buf.pointer);
 }
 
 static u8 nfit_dsm_revid(unsigned family, unsigned func)
 {
     static const u8 revid_table[NVDIMM_FAMILY_MAX+1][NVDIMM_CMD_MAX+1] = {
         [NVDIMM_FAMILY_INTEL] = {
             [NVDIMM_INTEL_GET_MODES ...
                 NVDIMM_INTEL_FW_ACTIVATE_ARM] = 2,
         },
     };
     u8 id;
 
     if (family > NVDIMM_FAMILY_MAX)
         return 0;
     if (func > NVDIMM_CMD_MAX)
         return 0;
     id = revid_table[family][func];
     if (id == 0)
         return 1; /* default */
     return id;
 }
 
 static bool payload_dumpable(struct nvdimm *nvdimm, unsigned int func)
 {
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     if (nfit_mem && nfit_mem->family == NVDIMM_FAMILY_INTEL
             && func >= NVDIMM_INTEL_GET_SECURITY_STATE
             && func <= NVDIMM_INTEL_MASTER_SECURE_ERASE)
         return IS_ENABLED(CONFIG_NFIT_SECURITY_DEBUG);
     return true;
 }
 
 static int cmd_to_func(struct nfit_mem *nfit_mem, unsigned int cmd,
         struct nd_cmd_pkg *call_pkg, int *family)
 {
     if (call_pkg) {
         int i;
 
         if (nfit_mem && nfit_mem->family != call_pkg->nd_family)
             return -ENOTTY;
 
         for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
             if (call_pkg->nd_reserved2[i])
                 return -EINVAL;
         *family = call_pkg->nd_family;
         return call_pkg->nd_command;
     }
 
     /* In the !call_pkg case, bus commands == bus functions */
     if (!nfit_mem)
         return cmd;
 
     /* Linux ND commands == NVDIMM_FAMILY_INTEL function numbers */
     if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
         return cmd;
 
     /*
      * Force function number validation to fail since 0 is never
      * published as a valid function in dsm_mask.
      */
     return 0;
 }
 
 int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
         unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
 {
     struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
     union acpi_object in_obj, in_buf, *out_obj;
     const struct nd_cmd_desc *desc = NULL;
     struct device *dev = acpi_desc->dev;
     struct nd_cmd_pkg *call_pkg = NULL;
     const char *cmd_name, *dimm_name;
     unsigned long cmd_mask, dsm_mask;
     u32 offset, fw_status = 0;
     acpi_handle handle;
     const guid_t *guid;
     int func, rc, i;
     int family = 0;
 
     if (cmd_rc)
         *cmd_rc = -EINVAL;
 
     if (cmd == ND_CMD_CALL)
         call_pkg = buf;
     func = cmd_to_func(nfit_mem, cmd, call_pkg, &family);
     if (func < 0)
         return func;
 
     if (nvdimm) {
         struct acpi_device *adev = nfit_mem->adev;
 
         if (!adev)
             return -ENOTTY;
 
         dimm_name = nvdimm_name(nvdimm);
         cmd_name = nvdimm_cmd_name(cmd);
         cmd_mask = nvdimm_cmd_mask(nvdimm);
         dsm_mask = nfit_mem->dsm_mask;
         desc = nd_cmd_dimm_desc(cmd);
         guid = to_nfit_uuid(nfit_mem->family);
         handle = adev->handle;
     } else {
         struct acpi_device *adev = to_acpi_dev(acpi_desc);
 
         cmd_name = nvdimm_bus_cmd_name(cmd);
         cmd_mask = nd_desc->cmd_mask;
         if (cmd == ND_CMD_CALL && call_pkg->nd_family) {
             family = call_pkg->nd_family;
             if (family > NVDIMM_BUS_FAMILY_MAX ||
                 !test_bit(family, &nd_desc->bus_family_mask))
                 return -EINVAL;
             family = array_index_nospec(family,
                             NVDIMM_BUS_FAMILY_MAX + 1);
             dsm_mask = acpi_desc->family_dsm_mask[family];
             guid = to_nfit_bus_uuid(family);
         } else {
             dsm_mask = acpi_desc->bus_dsm_mask;
             guid = to_nfit_uuid(NFIT_DEV_BUS);
         }
         desc = nd_cmd_bus_desc(cmd);
         handle = adev->handle;
         dimm_name = "bus";
     }
 
     if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
         return -ENOTTY;
 
     /*
      * Check for a valid command.  For ND_CMD_CALL, we also have to
      * make sure that the DSM function is supported.
      */
     if (cmd == ND_CMD_CALL &&
         (func > NVDIMM_CMD_MAX || !test_bit(func, &dsm_mask)))
         return -ENOTTY;
     else if (!test_bit(cmd, &cmd_mask))
         return -ENOTTY;
 
     in_obj.type = ACPI_TYPE_PACKAGE;
     in_obj.package.count = 1;
     in_obj.package.elements = &in_buf;
     in_buf.type = ACPI_TYPE_BUFFER;
     in_buf.buffer.pointer = buf;
     in_buf.buffer.length = 0;
 
     /* libnvdimm has already validated the input envelope */
     for (i = 0; i < desc->in_num; i++)
         in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc,
                 i, buf);
 
     if (call_pkg) {
         /* skip over package wrapper */
         in_buf.buffer.pointer = (void *) &call_pkg->nd_payload;
         in_buf.buffer.length = call_pkg->nd_size_in;
     }
 
     dev_dbg(dev, "%s cmd: %d: family: %d func: %d input length: %d\n",
         dimm_name, cmd, family, func, in_buf.buffer.length);
     if (payload_dumpable(nvdimm, func))
         print_hex_dump_debug("nvdimm in  ", DUMP_PREFIX_OFFSET, 4, 4,
                 in_buf.buffer.pointer,
                 min_t(u32, 256, in_buf.buffer.length), true);
 
     /* call the BIOS, prefer the named methods over _DSM if available */
     if (nvdimm && cmd == ND_CMD_GET_CONFIG_SIZE
             && test_bit(NFIT_MEM_LSR, &nfit_mem->flags))
         out_obj = acpi_label_info(handle);
     else if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA
             && test_bit(NFIT_MEM_LSR, &nfit_mem->flags)) {
         struct nd_cmd_get_config_data_hdr *p = buf;
 
         out_obj = acpi_label_read(handle, p->in_offset, p->in_length);
     } else if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA
             && test_bit(NFIT_MEM_LSW, &nfit_mem->flags)) {
         struct nd_cmd_set_config_hdr *p = buf;
 
         out_obj = acpi_label_write(handle, p->in_offset, p->in_length,
                 p->in_buf);
     } else {
         u8 revid;
 
         if (nvdimm)
             revid = nfit_dsm_revid(nfit_mem->family, func);
         else
             revid = 1;
         out_obj = acpi_evaluate_dsm(handle, guid, revid, func, &in_obj);
     }
 
     if (!out_obj) {
         dev_dbg(dev, "%s _DSM failed cmd: %s\n", dimm_name, cmd_name);
         return -EINVAL;
     }
 
     if (out_obj->type != ACPI_TYPE_BUFFER) {
         dev_dbg(dev, "%s unexpected output object type cmd: %s type: %d\n",
                 dimm_name, cmd_name, out_obj->type);
         rc = -EINVAL;
         goto out;
     }
 
     dev_dbg(dev, "%s cmd: %s output length: %d\n", dimm_name,
             cmd_name, out_obj->buffer.length);
     print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4, 4,
             out_obj->buffer.pointer,
             min_t(u32, 128, out_obj->buffer.length), true);
 
     if (call_pkg) {
         call_pkg->nd_fw_size = out_obj->buffer.length;
         memcpy(call_pkg->nd_payload + call_pkg->nd_size_in,
             out_obj->buffer.pointer,
             min(call_pkg->nd_fw_size, call_pkg->nd_size_out));
 
         ACPI_FREE(out_obj);
         /*
          * Need to support FW function w/o known size in advance.
          * Caller can determine required size based upon nd_fw_size.
          * If we return an error (like elsewhere) then caller wouldn't
          * be able to rely upon data returned to make calculation.
          */
         if (cmd_rc)
             *cmd_rc = 0;
         return 0;
     }
 
     for (i = 0, offset = 0; i < desc->out_num; i++) {
         u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
                 (u32 *) out_obj->buffer.pointer,
                 out_obj->buffer.length - offset);
 
         if (offset + out_size > out_obj->buffer.length) {
             dev_dbg(dev, "%s output object underflow cmd: %s field: %d\n",
                     dimm_name, cmd_name, i);
             break;
         }
 
         if (in_buf.buffer.length + offset + out_size > buf_len) {
             dev_dbg(dev, "%s output overrun cmd: %s field: %d\n",
                     dimm_name, cmd_name, i);
             rc = -ENXIO;
             goto out;
         }
         memcpy(buf + in_buf.buffer.length + offset,
                 out_obj->buffer.pointer + offset, out_size);
         offset += out_size;
     }
 
     /*
      * Set fw_status for all the commands with a known format to be
      * later interpreted by xlat_status().
      */
     if (i >= 1 && ((!nvdimm && cmd >= ND_CMD_ARS_CAP
                     && cmd <= ND_CMD_CLEAR_ERROR)
                 || (nvdimm && cmd >= ND_CMD_SMART
                     && cmd <= ND_CMD_VENDOR)))
         fw_status = *(u32 *) out_obj->buffer.pointer;
 
     if (offset + in_buf.buffer.length < buf_len) {
         if (i >= 1) {
             /*
              * status valid, return the number of bytes left
              * unfilled in the output buffer
              */
             rc = buf_len - offset - in_buf.buffer.length;
             if (cmd_rc)
                 *cmd_rc = xlat_status(nvdimm, buf, cmd,
                         fw_status);
         } else {
             dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
                     __func__, dimm_name, cmd_name, buf_len,
                     offset);
             rc = -ENXIO;
         }
     } else {
         rc = 0;
         if (cmd_rc)
             *cmd_rc = xlat_status(nvdimm, buf, cmd, fw_status);
     }
 
  out:
     ACPI_FREE(out_obj);
 
     return rc;
 }
 EXPORT_SYMBOL_GPL(acpi_nfit_ctl);
 
 static const char *spa_type_name(u16 type)
 {
     static const char *to_name[] = {
         [NFIT_SPA_VOLATILE] = "volatile",
         [NFIT_SPA_PM] = "pmem",
         [NFIT_SPA_DCR] = "dimm-control-region",
         [NFIT_SPA_BDW] = "block-data-window",
         [NFIT_SPA_VDISK] = "volatile-disk",
         [NFIT_SPA_VCD] = "volatile-cd",
         [NFIT_SPA_PDISK] = "persistent-disk",
         [NFIT_SPA_PCD] = "persistent-cd",
 
     };
 
     if (type > NFIT_SPA_PCD)
         return "unknown";
 
     return to_name[type];
 }
 
 int nfit_spa_type(struct acpi_nfit_system_address *spa)
 {
     guid_t guid;
     int i;
 
     import_guid(&guid, spa->range_guid);
     for (i = 0; i < NFIT_UUID_MAX; i++)
         if (guid_equal(to_nfit_uuid(i), &guid))
             return i;
     return -1;
 }
 
 static size_t sizeof_spa(struct acpi_nfit_system_address *spa)
 {
     if (spa->flags & ACPI_NFIT_LOCATION_COOKIE_VALID)
         return sizeof(*spa);
     return sizeof(*spa) - 8;
 }
 
 static bool add_spa(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev,
         struct acpi_nfit_system_address *spa)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_spa *nfit_spa;
 
     if (spa->header.length != sizeof_spa(spa))
         return false;
 
     list_for_each_entry(nfit_spa, &prev->spas, list) {
         if (memcmp(nfit_spa->spa, spa, sizeof_spa(spa)) == 0) {
             list_move_tail(&nfit_spa->list, &acpi_desc->spas);
             return true;
         }
     }
 
     nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa) + sizeof_spa(spa),
             GFP_KERNEL);
     if (!nfit_spa)
         return false;
     INIT_LIST_HEAD(&nfit_spa->list);
     memcpy(nfit_spa->spa, spa, sizeof_spa(spa));
     list_add_tail(&nfit_spa->list, &acpi_desc->spas);
     dev_dbg(dev, "spa index: %d type: %s\n",
             spa->range_index,
             spa_type_name(nfit_spa_type(spa)));
     return true;
 }
 
 static bool add_memdev(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev,
         struct acpi_nfit_memory_map *memdev)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_memdev *nfit_memdev;
 
     if (memdev->header.length != sizeof(*memdev))
         return false;
 
     list_for_each_entry(nfit_memdev, &prev->memdevs, list)
         if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) {
             list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
             return true;
         }
 
     nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev) + sizeof(*memdev),
             GFP_KERNEL);
     if (!nfit_memdev)
         return false;
     INIT_LIST_HEAD(&nfit_memdev->list);
     memcpy(nfit_memdev->memdev, memdev, sizeof(*memdev));
     list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
     dev_dbg(dev, "memdev handle: %#x spa: %d dcr: %d flags: %#x\n",
             memdev->device_handle, memdev->range_index,
             memdev->region_index, memdev->flags);
     return true;
 }
 
 int nfit_get_smbios_id(u32 device_handle, u16 *flags)
 {
     struct acpi_nfit_memory_map *memdev;
     struct acpi_nfit_desc *acpi_desc;
     struct nfit_mem *nfit_mem;
     u16 physical_id;
 
     mutex_lock(&acpi_desc_lock);
     list_for_each_entry(acpi_desc, &acpi_descs, list) {
         mutex_lock(&acpi_desc->init_mutex);
         list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
             memdev = __to_nfit_memdev(nfit_mem);
             if (memdev->device_handle == device_handle) {
                 *flags = memdev->flags;
                 physical_id = memdev->physical_id;
                 mutex_unlock(&acpi_desc->init_mutex);
                 mutex_unlock(&acpi_desc_lock);
                 return physical_id;
             }
         }
         mutex_unlock(&acpi_desc->init_mutex);
     }
     mutex_unlock(&acpi_desc_lock);
 
     return -ENODEV;
 }
 EXPORT_SYMBOL_GPL(nfit_get_smbios_id);
 
 /*
  * An implementation may provide a truncated control region if no block windows
  * are defined.
  */
 static size_t sizeof_dcr(struct acpi_nfit_control_region *dcr)
 {
     if (dcr->header.length < offsetof(struct acpi_nfit_control_region,
                 window_size))
         return 0;
     if (dcr->windows)
         return sizeof(*dcr);
     return offsetof(struct acpi_nfit_control_region, window_size);
 }
 
 static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev,
         struct acpi_nfit_control_region *dcr)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_dcr *nfit_dcr;
 
     if (!sizeof_dcr(dcr))
         return false;
 
     list_for_each_entry(nfit_dcr, &prev->dcrs, list)
         if (memcmp(nfit_dcr->dcr, dcr, sizeof_dcr(dcr)) == 0) {
             list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
             return true;
         }
 
     nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr) + sizeof(*dcr),
             GFP_KERNEL);
     if (!nfit_dcr)
         return false;
     INIT_LIST_HEAD(&nfit_dcr->list);
     memcpy(nfit_dcr->dcr, dcr, sizeof_dcr(dcr));
     list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
     dev_dbg(dev, "dcr index: %d windows: %d\n",
             dcr->region_index, dcr->windows);
     return true;
 }
 
 static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev,
         struct acpi_nfit_data_region *bdw)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_bdw *nfit_bdw;
 
     if (bdw->header.length != sizeof(*bdw))
         return false;
     list_for_each_entry(nfit_bdw, &prev->bdws, list)
         if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) {
             list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
             return true;
         }
 
     nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw) + sizeof(*bdw),
             GFP_KERNEL);
     if (!nfit_bdw)
         return false;
     INIT_LIST_HEAD(&nfit_bdw->list);
     memcpy(nfit_bdw->bdw, bdw, sizeof(*bdw));
     list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
     dev_dbg(dev, "bdw dcr: %d windows: %d\n",
             bdw->region_index, bdw->windows);
     return true;
 }
 
 static size_t sizeof_idt(struct acpi_nfit_interleave *idt)
 {
     if (idt->header.length < sizeof(*idt))
         return 0;
     return sizeof(*idt) + sizeof(u32) * (idt->line_count - 1);
 }
 
 static bool add_idt(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev,
         struct acpi_nfit_interleave *idt)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_idt *nfit_idt;
 
     if (!sizeof_idt(idt))
         return false;
 
     list_for_each_entry(nfit_idt, &prev->idts, list) {
         if (sizeof_idt(nfit_idt->idt) != sizeof_idt(idt))
             continue;
 
         if (memcmp(nfit_idt->idt, idt, sizeof_idt(idt)) == 0) {
             list_move_tail(&nfit_idt->list, &acpi_desc->idts);
             return true;
         }
     }
 
     nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt) + sizeof_idt(idt),
             GFP_KERNEL);
     if (!nfit_idt)
         return false;
     INIT_LIST_HEAD(&nfit_idt->list);
     memcpy(nfit_idt->idt, idt, sizeof_idt(idt));
     list_add_tail(&nfit_idt->list, &acpi_desc->idts);
     dev_dbg(dev, "idt index: %d num_lines: %d\n",
             idt->interleave_index, idt->line_count);
     return true;
 }
 
 static size_t sizeof_flush(struct acpi_nfit_flush_address *flush)
 {
     if (flush->header.length < sizeof(*flush))
         return 0;
     return sizeof(*flush) + sizeof(u64) * (flush->hint_count - 1);
 }
 
 static bool add_flush(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev,
         struct acpi_nfit_flush_address *flush)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_flush *nfit_flush;
 
     if (!sizeof_flush(flush))
         return false;
 
     list_for_each_entry(nfit_flush, &prev->flushes, list) {
         if (sizeof_flush(nfit_flush->flush) != sizeof_flush(flush))
             continue;
 
         if (memcmp(nfit_flush->flush, flush,
                     sizeof_flush(flush)) == 0) {
             list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
             return true;
         }
     }
 
     nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush)
             + sizeof_flush(flush), GFP_KERNEL);
     if (!nfit_flush)
         return false;
     INIT_LIST_HEAD(&nfit_flush->list);
     memcpy(nfit_flush->flush, flush, sizeof_flush(flush));
     list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
     dev_dbg(dev, "nfit_flush handle: %d hint_count: %d\n",
             flush->device_handle, flush->hint_count);
     return true;
 }
 
 static bool add_platform_cap(struct acpi_nfit_desc *acpi_desc,
         struct acpi_nfit_capabilities *pcap)
 {
     struct device *dev = acpi_desc->dev;
     u32 mask;
 
     mask = (1 << (pcap->highest_capability + 1)) - 1;
     acpi_desc->platform_cap = pcap->capabilities & mask;
     dev_dbg(dev, "cap: %#x\n", acpi_desc->platform_cap);
     return true;
 }
 
 static void *add_table(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev, void *table, const void *end)
 {
     struct device *dev = acpi_desc->dev;
     struct acpi_nfit_header *hdr;
     void *err = ERR_PTR(-ENOMEM);
 
     if (table >= end)
         return NULL;
 
     hdr = table;
     if (!hdr->length) {
         dev_warn(dev, "found a zero length table '%d' parsing nfit\n",
             hdr->type);
         return NULL;
     }
 
     switch (hdr->type) {
     case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:
         if (!add_spa(acpi_desc, prev, table))
             return err;
         break;
     case ACPI_NFIT_TYPE_MEMORY_MAP:
         if (!add_memdev(acpi_desc, prev, table))
             return err;
         break;
     case ACPI_NFIT_TYPE_CONTROL_REGION:
         if (!add_dcr(acpi_desc, prev, table))
             return err;
         break;
     case ACPI_NFIT_TYPE_DATA_REGION:
         if (!add_bdw(acpi_desc, prev, table))
             return err;
         break;
     case ACPI_NFIT_TYPE_INTERLEAVE:
         if (!add_idt(acpi_desc, prev, table))
             return err;
         break;
     case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
         if (!add_flush(acpi_desc, prev, table))
             return err;
         break;
     case ACPI_NFIT_TYPE_SMBIOS:
         dev_dbg(dev, "smbios\n");
         break;
     case ACPI_NFIT_TYPE_CAPABILITIES:
         if (!add_platform_cap(acpi_desc, table))
             return err;
         break;
     default:
         dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
         break;
     }
 
     return table + hdr->length;
 }
 
 static int __nfit_mem_init(struct acpi_nfit_desc *acpi_desc,
         struct acpi_nfit_system_address *spa)
 {
     struct nfit_mem *nfit_mem, *found;
     struct nfit_memdev *nfit_memdev;
     int type = spa ? nfit_spa_type(spa) : 0;
 
     switch (type) {
     case NFIT_SPA_DCR:
     case NFIT_SPA_PM:
         break;
     default:
         if (spa)
             return 0;
     }
 
     /*
      * This loop runs in two modes, when a dimm is mapped the loop
      * adds memdev associations to an existing dimm, or creates a
      * dimm. In the unmapped dimm case this loop sweeps for memdev
      * instances with an invalid / zero range_index and adds those
      * dimms without spa associations.
      */
     list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
         struct nfit_flush *nfit_flush;
         struct nfit_dcr *nfit_dcr;
         u32 device_handle;
         u16 dcr;
 
         if (spa && nfit_memdev->memdev->range_index != spa->range_index)
             continue;
         if (!spa && nfit_memdev->memdev->range_index)
             continue;
         found = NULL;
         dcr = nfit_memdev->memdev->region_index;
         device_handle = nfit_memdev->memdev->device_handle;
         list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
             if (__to_nfit_memdev(nfit_mem)->device_handle
                     == device_handle) {
                 found = nfit_mem;
                 break;
             }
 
         if (found)
             nfit_mem = found;
         else {
             nfit_mem = devm_kzalloc(acpi_desc->dev,
                     sizeof(*nfit_mem), GFP_KERNEL);
             if (!nfit_mem)
                 return -ENOMEM;
             INIT_LIST_HEAD(&nfit_mem->list);
             nfit_mem->acpi_desc = acpi_desc;
             list_add(&nfit_mem->list, &acpi_desc->dimms);
         }
 
         list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
             if (nfit_dcr->dcr->region_index != dcr)
                 continue;
             /*
              * Record the control region for the dimm.  For
              * the ACPI 6.1 case, where there are separate
              * control regions for the pmem vs blk
              * interfaces, be sure to record the extended
              * blk details.
              */
             if (!nfit_mem->dcr)
                 nfit_mem->dcr = nfit_dcr->dcr;
             else if (nfit_mem->dcr->windows == 0
                     && nfit_dcr->dcr->windows)
                 nfit_mem->dcr = nfit_dcr->dcr;
             break;
         }
 
         list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
             struct acpi_nfit_flush_address *flush;
             u16 i;
 
             if (nfit_flush->flush->device_handle != device_handle)
                 continue;
             nfit_mem->nfit_flush = nfit_flush;
             flush = nfit_flush->flush;
             nfit_mem->flush_wpq = devm_kcalloc(acpi_desc->dev,
                     flush->hint_count,
                     sizeof(struct resource),
                     GFP_KERNEL);
             if (!nfit_mem->flush_wpq)
                 return -ENOMEM;
             for (i = 0; i < flush->hint_count; i++) {
                 struct resource *res = &nfit_mem->flush_wpq[i];
 
                 res->start = flush->hint_address[i];
                 res->end = res->start + 8 - 1;
             }
             break;
         }
 
         if (dcr && !nfit_mem->dcr) {
             dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
                     spa->range_index, dcr);
             return -ENODEV;
         }
 
         if (type == NFIT_SPA_DCR) {
             struct nfit_idt *nfit_idt;
             u16 idt_idx;
 
             /* multiple dimms may share a SPA when interleaved */
             nfit_mem->spa_dcr = spa;
             nfit_mem->memdev_dcr = nfit_memdev->memdev;
             idt_idx = nfit_memdev->memdev->interleave_index;
             list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
                 if (nfit_idt->idt->interleave_index != idt_idx)
                     continue;
                 nfit_mem->idt_dcr = nfit_idt->idt;
                 break;
             }
         } else if (type == NFIT_SPA_PM) {
             /*
              * A single dimm may belong to multiple SPA-PM
              * ranges, record at least one in addition to
              * any SPA-DCR range.
              */
             nfit_mem->memdev_pmem = nfit_memdev->memdev;
         } else
             nfit_mem->memdev_dcr = nfit_memdev->memdev;
     }
 
     return 0;
 }
 
 static int nfit_mem_cmp(void *priv, const struct list_head *_a,
         const struct list_head *_b)
 {
     struct nfit_mem *a = container_of(_a, typeof(*a), list);
     struct nfit_mem *b = container_of(_b, typeof(*b), list);
     u32 handleA, handleB;
 
     handleA = __to_nfit_memdev(a)->device_handle;
     handleB = __to_nfit_memdev(b)->device_handle;
     if (handleA < handleB)
         return -1;
     else if (handleA > handleB)
         return 1;
     return 0;
 }
 
 static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
 {
     struct nfit_spa *nfit_spa;
     int rc;
 
 
     /*
      * For each SPA-DCR or SPA-PMEM address range find its
      * corresponding MEMDEV(s).  From each MEMDEV find the
      * corresponding DCR.  Then, if we're operating on a SPA-DCR,
      * try to find a SPA-BDW and a corresponding BDW that references
      * the DCR.  Throw it all into an nfit_mem object.  Note, that
      * BDWs are optional.
      */
     list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
         rc = __nfit_mem_init(acpi_desc, nfit_spa->spa);
         if (rc)
             return rc;
     }
 
     /*
      * If a DIMM has failed to be mapped into SPA there will be no
      * SPA entries above. Find and register all the unmapped DIMMs
      * for reporting and recovery purposes.
      */
     rc = __nfit_mem_init(acpi_desc, NULL);
     if (rc)
         return rc;
 
     list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
 
     return 0;
 }
 
 static ssize_t bus_dsm_mask_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
     struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
     struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
     return sprintf(buf, "%#lx\n", acpi_desc->bus_dsm_mask);
 }
 static struct device_attribute dev_attr_bus_dsm_mask =
         __ATTR(dsm_mask, 0444, bus_dsm_mask_show, NULL);
 
 static ssize_t revision_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
     struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
     struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
     return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
 }
 static DEVICE_ATTR_RO(revision);
 
 static ssize_t hw_error_scrub_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
     struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
     struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
     return sprintf(buf, "%d\n", acpi_desc->scrub_mode);
 }
 
 /*
  * The 'hw_error_scrub' attribute can have the following values written to it:
  * '0': Switch to the default mode where an exception will only insert
  *      the address of the memory error into the poison and badblocks lists.
  * '1': Enable a full scrub to happen if an exception for a memory error is
  *      received.
  */
 static ssize_t hw_error_scrub_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t size)
 {
     struct nvdimm_bus_descriptor *nd_desc;
     ssize_t rc;
     long val;
 
     rc = kstrtol(buf, 0, &val);
     if (rc)
         return rc;
 
     device_lock(dev);
     nd_desc = dev_get_drvdata(dev);
     if (nd_desc) {
         struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
         switch (val) {
         case HW_ERROR_SCRUB_ON:
             acpi_desc->scrub_mode = HW_ERROR_SCRUB_ON;
             break;
         case HW_ERROR_SCRUB_OFF:
             acpi_desc->scrub_mode = HW_ERROR_SCRUB_OFF;
             break;
         default:
             rc = -EINVAL;
             break;
         }
     }
     device_unlock(dev);
     if (rc)
         return rc;
     return size;
 }
 static DEVICE_ATTR_RW(hw_error_scrub);
 
 /*
  * This shows the number of full Address Range Scrubs that have been
  * completed since driver load time. Userspace can wait on this using
  * select/poll etc. A '+' at the end indicates an ARS is in progress
  */
 static ssize_t scrub_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm_bus_descriptor *nd_desc;
     struct acpi_nfit_desc *acpi_desc;
     ssize_t rc = -ENXIO;
     bool busy;
 
     device_lock(dev);
     nd_desc = dev_get_drvdata(dev);
     if (!nd_desc) {
         device_unlock(dev);
         return rc;
     }
     acpi_desc = to_acpi_desc(nd_desc);
 
     mutex_lock(&acpi_desc->init_mutex);
     busy = test_bit(ARS_BUSY, &acpi_desc->scrub_flags)
         && !test_bit(ARS_CANCEL, &acpi_desc->scrub_flags);
     rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, busy ? "+\n" : "\n");
     /* Allow an admin to poll the busy state at a higher rate */
     if (busy && capable(CAP_SYS_RAWIO) && !test_and_set_bit(ARS_POLL,
                 &acpi_desc->scrub_flags)) {
         acpi_desc->scrub_tmo = 1;
         mod_delayed_work(nfit_wq, &acpi_desc->dwork, HZ);
     }
 
     mutex_unlock(&acpi_desc->init_mutex);
     device_unlock(dev);
     return rc;
 }
 
 static ssize_t scrub_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t size)
 {
     struct nvdimm_bus_descriptor *nd_desc;
     ssize_t rc;
     long val;
 
     rc = kstrtol(buf, 0, &val);
     if (rc)
         return rc;
     if (val != 1)
         return -EINVAL;
 
     device_lock(dev);
     nd_desc = dev_get_drvdata(dev);
     if (nd_desc) {
         struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
         rc = acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_LONG);
     }
     device_unlock(dev);
     if (rc)
         return rc;
     return size;
 }
 static DEVICE_ATTR_RW(scrub);
 
 static bool ars_supported(struct nvdimm_bus *nvdimm_bus)
 {
     struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
     const unsigned long mask = 1 << ND_CMD_ARS_CAP | 1 << ND_CMD_ARS_START
         | 1 << ND_CMD_ARS_STATUS;
 
     return (nd_desc->cmd_mask & mask) == mask;
 }
 
 static umode_t nfit_visible(struct kobject *kobj, struct attribute *a, int n)
 {
     struct device *dev = kobj_to_dev(kobj);
     struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 
     if (a == &dev_attr_scrub.attr)
         return ars_supported(nvdimm_bus) ? a->mode : 0;
 
     if (a == &dev_attr_firmware_activate_noidle.attr)
         return intel_fwa_supported(nvdimm_bus) ? a->mode : 0;
 
     return a->mode;
 }
 
 static struct attribute *acpi_nfit_attributes[] = {
     &dev_attr_revision.attr,
     &dev_attr_scrub.attr,
     &dev_attr_hw_error_scrub.attr,
     &dev_attr_bus_dsm_mask.attr,
     &dev_attr_firmware_activate_noidle.attr,
     NULL,
 };
 
 static const struct attribute_group acpi_nfit_attribute_group = {
     .name = "nfit",
     .attrs = acpi_nfit_attributes,
     .is_visible = nfit_visible,
 };
 
 static const struct attribute_group *acpi_nfit_attribute_groups[] = {
     &acpi_nfit_attribute_group,
     NULL,
 };
 
 static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     return __to_nfit_memdev(nfit_mem);
 }
 
 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     return nfit_mem->dcr;
 }
 
 static ssize_t handle_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
 
     return sprintf(buf, "%#x\n", memdev->device_handle);
 }
 static DEVICE_ATTR_RO(handle);
 
 static ssize_t phys_id_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
 
     return sprintf(buf, "%#x\n", memdev->physical_id);
 }
 static DEVICE_ATTR_RO(phys_id);
 
 static ssize_t vendor_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id));
 }
 static DEVICE_ATTR_RO(vendor);
 
 static ssize_t rev_id_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id));
 }
 static DEVICE_ATTR_RO(rev_id);
 
 static ssize_t device_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->device_id));
 }
 static DEVICE_ATTR_RO(device);
 
 static ssize_t subsystem_vendor_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id));
 }
 static DEVICE_ATTR_RO(subsystem_vendor);
 
 static ssize_t subsystem_rev_id_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n",
             be16_to_cpu(dcr->subsystem_revision_id));
 }
 static DEVICE_ATTR_RO(subsystem_rev_id);
 
 static ssize_t subsystem_device_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id));
 }
 static DEVICE_ATTR_RO(subsystem_device);
 
 static int num_nvdimm_formats(struct nvdimm *nvdimm)
 {
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
     int formats = 0;
 
     if (nfit_mem->memdev_pmem)
         formats++;
     return formats;
 }
 
 static ssize_t format_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%04x\n", le16_to_cpu(dcr->code));
 }
 static DEVICE_ATTR_RO(format);
 
 static ssize_t format1_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     u32 handle;
     ssize_t rc = -ENXIO;
     struct nfit_mem *nfit_mem;
     struct nfit_memdev *nfit_memdev;
     struct acpi_nfit_desc *acpi_desc;
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     nfit_mem = nvdimm_provider_data(nvdimm);
     acpi_desc = nfit_mem->acpi_desc;
     handle = to_nfit_memdev(dev)->device_handle;
 
     /* assumes DIMMs have at most 2 published interface codes */
     mutex_lock(&acpi_desc->init_mutex);
     list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
         struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
         struct nfit_dcr *nfit_dcr;
 
         if (memdev->device_handle != handle)
             continue;
 
         list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
             if (nfit_dcr->dcr->region_index != memdev->region_index)
                 continue;
             if (nfit_dcr->dcr->code == dcr->code)
                 continue;
             rc = sprintf(buf, "0x%04x\n",
                     le16_to_cpu(nfit_dcr->dcr->code));
             break;
         }
         if (rc != -ENXIO)
             break;
     }
     mutex_unlock(&acpi_desc->init_mutex);
     return rc;
 }
 static DEVICE_ATTR_RO(format1);
 
 static ssize_t formats_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
 
     return sprintf(buf, "%d\n", num_nvdimm_formats(nvdimm));
 }
 static DEVICE_ATTR_RO(formats);
 
 static ssize_t serial_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
     return sprintf(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number));
 }
 static DEVICE_ATTR_RO(serial);
 
 static ssize_t family_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     if (nfit_mem->family < 0)
         return -ENXIO;
     return sprintf(buf, "%d\n", nfit_mem->family);
 }
 static DEVICE_ATTR_RO(family);
 
 static ssize_t dsm_mask_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     if (nfit_mem->family < 0)
         return -ENXIO;
     return sprintf(buf, "%#lx\n", nfit_mem->dsm_mask);
 }
 static DEVICE_ATTR_RO(dsm_mask);
 
 static ssize_t flags_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
     u16 flags = __to_nfit_memdev(nfit_mem)->flags;
 
     if (test_bit(NFIT_MEM_DIRTY, &nfit_mem->flags))
         flags |= ACPI_NFIT_MEM_FLUSH_FAILED;
 
     return sprintf(buf, "%s%s%s%s%s%s%s\n",
         flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
         flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
         flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
         flags & ACPI_NFIT_MEM_NOT_ARMED ? "not_armed " : "",
         flags & ACPI_NFIT_MEM_HEALTH_OBSERVED ? "smart_event " : "",
         flags & ACPI_NFIT_MEM_MAP_FAILED ? "map_fail " : "",
         flags & ACPI_NFIT_MEM_HEALTH_ENABLED ? "smart_notify " : "");
 }
 static DEVICE_ATTR_RO(flags);
 
 static ssize_t id_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     return sprintf(buf, "%s\n", nfit_mem->id);
 }
 static DEVICE_ATTR_RO(id);
 
 static ssize_t dirty_shutdown_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     return sprintf(buf, "%d\n", nfit_mem->dirty_shutdown);
 }
 static DEVICE_ATTR_RO(dirty_shutdown);
 
 static struct attribute *acpi_nfit_dimm_attributes[] = {
     &dev_attr_handle.attr,
     &dev_attr_phys_id.attr,
     &dev_attr_vendor.attr,
     &dev_attr_device.attr,
     &dev_attr_rev_id.attr,
     &dev_attr_subsystem_vendor.attr,
     &dev_attr_subsystem_device.attr,
     &dev_attr_subsystem_rev_id.attr,
     &dev_attr_format.attr,
     &dev_attr_formats.attr,
     &dev_attr_format1.attr,
     &dev_attr_serial.attr,
     &dev_attr_flags.attr,
     &dev_attr_id.attr,
     &dev_attr_family.attr,
     &dev_attr_dsm_mask.attr,
     &dev_attr_dirty_shutdown.attr,
     NULL,
 };
 
 static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
         struct attribute *a, int n)
 {
     struct device *dev = kobj_to_dev(kobj);
     struct nvdimm *nvdimm = to_nvdimm(dev);
     struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
     if (!to_nfit_dcr(dev)) {
         /* Without a dcr only the memdev attributes can be surfaced */
         if (a == &dev_attr_handle.attr || a == &dev_attr_phys_id.attr
                 || a == &dev_attr_flags.attr
                 || a == &dev_attr_family.attr
                 || a == &dev_attr_dsm_mask.attr)
             return a->mode;
         return 0;
     }
 
     if (a == &dev_attr_format1.attr && num_nvdimm_formats(nvdimm) <= 1)
         return 0;
 
     if (!test_bit(NFIT_MEM_DIRTY_COUNT, &nfit_mem->flags)
             && a == &dev_attr_dirty_shutdown.attr)
         return 0;
 
     return a->mode;
 }
 
 static const struct attribute_group acpi_nfit_dimm_attribute_group = {
     .name = "nfit",
     .attrs = acpi_nfit_dimm_attributes,
     .is_visible = acpi_nfit_dimm_attr_visible,
 };
 
 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
     &acpi_nfit_dimm_attribute_group,
     NULL,
 };
 
 static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,
         u32 device_handle)
 {
     struct nfit_mem *nfit_mem;
 
     list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
         if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)
             return nfit_mem->nvdimm;
 
     return NULL;
 }
 
 void __acpi_nvdimm_notify(struct device *dev, u32 event)
 {
     struct nfit_mem *nfit_mem;
     struct acpi_nfit_desc *acpi_desc;
 
     dev_dbg(dev->parent, "%s: event: %d\n", dev_name(dev),
             event);
 
     if (event != NFIT_NOTIFY_DIMM_HEALTH) {
         dev_dbg(dev->parent, "%s: unknown event: %d\n", dev_name(dev),
                 event);
         return;
     }
 
     acpi_desc = dev_get_drvdata(dev->parent);
     if (!acpi_desc)
         return;
 
     /*
      * If we successfully retrieved acpi_desc, then we know nfit_mem data
      * is still valid.
      */
     nfit_mem = dev_get_drvdata(dev);
     if (nfit_mem && nfit_mem->flags_attr)
         sysfs_notify_dirent(nfit_mem->flags_attr);
 }
 EXPORT_SYMBOL_GPL(__acpi_nvdimm_notify);
 
 static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data)
 {
     struct acpi_device *adev = data;
     struct device *dev = &adev->dev;
 
     device_lock(dev->parent);
     __acpi_nvdimm_notify(dev, event);
     device_unlock(dev->parent);
 }
 
 static bool acpi_nvdimm_has_method(struct acpi_device *adev, char *method)
 {
     acpi_handle handle;
     acpi_status status;
 
     status = acpi_get_handle(adev->handle, method, &handle);
 
     if (ACPI_SUCCESS(status))
         return true;
     return false;
 }
 
 __weak void nfit_intel_shutdown_status(struct nfit_mem *nfit_mem)
 {
     struct device *dev = &nfit_mem->adev->dev;
     struct nd_intel_smart smart = { 0 };
     union acpi_object in_buf = {
         .buffer.type = ACPI_TYPE_BUFFER,
         .buffer.length = 0,
     };
     union acpi_object in_obj = {
         .package.type = ACPI_TYPE_PACKAGE,
         .package.count = 1,
         .package.elements = &in_buf,
     };
     const u8 func = ND_INTEL_SMART;
     const guid_t *guid = to_nfit_uuid(nfit_mem->family);
     u8 revid = nfit_dsm_revid(nfit_mem->family, func);
     struct acpi_device *adev = nfit_mem->adev;
     acpi_handle handle = adev->handle;
     union acpi_object *out_obj;
 
     if ((nfit_mem->dsm_mask & (1 << func)) == 0)
         return;
 
     out_obj = acpi_evaluate_dsm(handle, guid, revid, func, &in_obj);
     if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER
             || out_obj->buffer.length < sizeof(smart)) {
         dev_dbg(dev->parent, "%s: failed to retrieve initial health\n",
                 dev_name(dev));
         ACPI_FREE(out_obj);
         return;
     }
     memcpy(&smart, out_obj->buffer.pointer, sizeof(smart));
     ACPI_FREE(out_obj);
 
     if (smart.flags & ND_INTEL_SMART_SHUTDOWN_VALID) {
         if (smart.shutdown_state)
             set_bit(NFIT_MEM_DIRTY, &nfit_mem->flags);
     }
 
     if (smart.flags & ND_INTEL_SMART_SHUTDOWN_COUNT_VALID) {
         set_bit(NFIT_MEM_DIRTY_COUNT, &nfit_mem->flags);
         nfit_mem->dirty_shutdown = smart.shutdown_count;
     }
 }
 
 static void populate_shutdown_status(struct nfit_mem *nfit_mem)
 {
     /*
      * For DIMMs that provide a dynamic facility to retrieve a
      * dirty-shutdown status and/or a dirty-shutdown count, cache
      * these values in nfit_mem.
      */
     if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
         nfit_intel_shutdown_status(nfit_mem);
 }
 
 static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
         struct nfit_mem *nfit_mem, u32 device_handle)
 {
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
     struct acpi_device *adev, *adev_dimm;
     struct device *dev = acpi_desc->dev;
     unsigned long dsm_mask, label_mask;
     const guid_t *guid;
     int i;
     int family = -1;
     struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
 
     /* nfit test assumes 1:1 relationship between commands and dsms */
     nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en;
     nfit_mem->family = NVDIMM_FAMILY_INTEL;
     set_bit(NVDIMM_FAMILY_INTEL, &nd_desc->dimm_family_mask);
 
     if (dcr->valid_fields & ACPI_NFIT_CONTROL_MFG_INFO_VALID)
         sprintf(nfit_mem->id, "%04x-%02x-%04x-%08x",
                 be16_to_cpu(dcr->vendor_id),
                 dcr->manufacturing_location,
                 be16_to_cpu(dcr->manufacturing_date),
                 be32_to_cpu(dcr->serial_number));
     else
         sprintf(nfit_mem->id, "%04x-%08x",
                 be16_to_cpu(dcr->vendor_id),
                 be32_to_cpu(dcr->serial_number));
 
     adev = to_acpi_dev(acpi_desc);
     if (!adev) {
         /* unit test case */
         populate_shutdown_status(nfit_mem);
         return 0;
     }
 
     adev_dimm = acpi_find_child_device(adev, device_handle, false);
     nfit_mem->adev = adev_dimm;
     if (!adev_dimm) {
         dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n",
                 device_handle);
         return force_enable_dimms ? 0 : -ENODEV;
     }
 
     if (ACPI_FAILURE(acpi_install_notify_handler(adev_dimm->handle,
         ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify, adev_dimm))) {
         dev_err(dev, "%s: notification registration failed\n",
                 dev_name(&adev_dimm->dev));
         return -ENXIO;
     }
     /*
      * Record nfit_mem for the notification path to track back to
      * the nfit sysfs attributes for this dimm device object.
      */
     dev_set_drvdata(&adev_dimm->dev, nfit_mem);
 
     /*
      * There are 4 "legacy" NVDIMM command sets
      * (NVDIMM_FAMILY_{INTEL,MSFT,HPE1,HPE2}) that were created before
      * an EFI working group was established to constrain this
      * proliferation. The nfit driver probes for the supported command
      * set by GUID. Note, if you're a platform developer looking to add
      * a new command set to this probe, consider using an existing set,
      * or otherwise seek approval to publish the command set at
      * http://www.uefi.org/RFIC_LIST.
      *
      * Note, that checking for function0 (bit0) tells us if any commands
      * are reachable through this GUID.
      */
     clear_bit(NVDIMM_FAMILY_INTEL, &nd_desc->dimm_family_mask);
     for (i = 0; i <= NVDIMM_FAMILY_MAX; i++)
         if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1)) {
             set_bit(i, &nd_desc->dimm_family_mask);
             if (family < 0 || i == default_dsm_family)
                 family = i;
         }
 
     /* limit the supported commands to those that are publicly documented */
     nfit_mem->family = family;
     if (override_dsm_mask && !disable_vendor_specific)
         dsm_mask = override_dsm_mask;
     else if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
         dsm_mask = NVDIMM_INTEL_CMDMASK;
         if (disable_vendor_specific)
             dsm_mask &= ~(1 << ND_CMD_VENDOR);
     } else if (nfit_mem->family == NVDIMM_FAMILY_HPE1) {
         dsm_mask = 0x1c3c76;
     } else if (nfit_mem->family == NVDIMM_FAMILY_HPE2) {
         dsm_mask = 0x1fe;
         if (disable_vendor_specific)
             dsm_mask &= ~(1 << 8);
     } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT) {
         dsm_mask = 0xffffffff;
     } else if (nfit_mem->family == NVDIMM_FAMILY_HYPERV) {
         dsm_mask = 0x1f;
     } else {
         dev_dbg(dev, "unknown dimm command family\n");
         nfit_mem->family = -1;
         /* DSMs are optional, continue loading the driver... */
         return 0;
     }
 
     /*
      * Function 0 is the command interrogation function, don't
      * export it to potential userspace use, and enable it to be
      * used as an error value in acpi_nfit_ctl().
      */
     dsm_mask &= ~1UL;
 
     guid = to_nfit_uuid(nfit_mem->family);
     for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
         if (acpi_check_dsm(adev_dimm->handle, guid,
                     nfit_dsm_revid(nfit_mem->family, i),
                     1ULL << i))
             set_bit(i, &nfit_mem->dsm_mask);
 
     /*
      * Prefer the NVDIMM_FAMILY_INTEL label read commands if present
      * due to their better semantics handling locked capacity.
      */
     label_mask = 1 << ND_CMD_GET_CONFIG_SIZE | 1 << ND_CMD_GET_CONFIG_DATA
         | 1 << ND_CMD_SET_CONFIG_DATA;
     if (family == NVDIMM_FAMILY_INTEL
             && (dsm_mask & label_mask) == label_mask)
         /* skip _LS{I,R,W} enabling */;
     else {
         if (acpi_nvdimm_has_method(adev_dimm, "_LSI")
                 && acpi_nvdimm_has_method(adev_dimm, "_LSR")) {
             dev_dbg(dev, "%s: has _LSR\n", dev_name(&adev_dimm->dev));
             set_bit(NFIT_MEM_LSR, &nfit_mem->flags);
         }
 
         if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags)
                 && acpi_nvdimm_has_method(adev_dimm, "_LSW")) {
             dev_dbg(dev, "%s: has _LSW\n", dev_name(&adev_dimm->dev));
             set_bit(NFIT_MEM_LSW, &nfit_mem->flags);
         }
 
         /*
          * Quirk read-only label configurations to preserve
          * access to label-less namespaces by default.
          */
         if (!test_bit(NFIT_MEM_LSW, &nfit_mem->flags)
                 && !force_labels) {
             dev_dbg(dev, "%s: No _LSW, disable labels\n",
                     dev_name(&adev_dimm->dev));
             clear_bit(NFIT_MEM_LSR, &nfit_mem->flags);
         } else
             dev_dbg(dev, "%s: Force enable labels\n",
                     dev_name(&adev_dimm->dev));
     }
 
     populate_shutdown_status(nfit_mem);
 
     return 0;
 }
 
 static void shutdown_dimm_notify(void *data)
 {
     struct acpi_nfit_desc *acpi_desc = data;
     struct nfit_mem *nfit_mem;
 
     mutex_lock(&acpi_desc->init_mutex);
     /*
      * Clear out the nfit_mem->flags_attr and shut down dimm event
      * notifications.
      */
     list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
         struct acpi_device *adev_dimm = nfit_mem->adev;
 
         if (nfit_mem->flags_attr) {
             sysfs_put(nfit_mem->flags_attr);
             nfit_mem->flags_attr = NULL;
         }
         if (adev_dimm) {
             acpi_remove_notify_handler(adev_dimm->handle,
                     ACPI_DEVICE_NOTIFY, acpi_nvdimm_notify);
             dev_set_drvdata(&adev_dimm->dev, NULL);
         }
     }
     mutex_unlock(&acpi_desc->init_mutex);
 }
 
 static const struct nvdimm_security_ops *acpi_nfit_get_security_ops(int family)
 {
     switch (family) {
     case NVDIMM_FAMILY_INTEL:
         return intel_security_ops;
     default:
         return NULL;
     }
 }
 
 static const struct nvdimm_fw_ops *acpi_nfit_get_fw_ops(
         struct nfit_mem *nfit_mem)
 {
     unsigned long mask;
     struct acpi_nfit_desc *acpi_desc = nfit_mem->acpi_desc;
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
 
     if (!nd_desc->fw_ops)
         return NULL;
 
     if (nfit_mem->family != NVDIMM_FAMILY_INTEL)
         return NULL;
 
     mask = nfit_mem->dsm_mask & NVDIMM_INTEL_FW_ACTIVATE_CMDMASK;
     if (mask != NVDIMM_INTEL_FW_ACTIVATE_CMDMASK)
         return NULL;
 
     return intel_fw_ops;
 }
 
 static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
 {
     struct nfit_mem *nfit_mem;
     int dimm_count = 0, rc;
     struct nvdimm *nvdimm;
 
     list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
         struct acpi_nfit_flush_address *flush;
         unsigned long flags = 0, cmd_mask;
         struct nfit_memdev *nfit_memdev;
         u32 device_handle;
         u16 mem_flags;
 
         device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
         nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
         if (nvdimm) {
             dimm_count++;
             continue;
         }
 
         /* collate flags across all memdevs for this dimm */
         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
             struct acpi_nfit_memory_map *dimm_memdev;
 
             dimm_memdev = __to_nfit_memdev(nfit_mem);
             if (dimm_memdev->device_handle
                     != nfit_memdev->memdev->device_handle)
                 continue;
             dimm_memdev->flags |= nfit_memdev->memdev->flags;
         }
 
         mem_flags = __to_nfit_memdev(nfit_mem)->flags;
         if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
             set_bit(NDD_UNARMED, &flags);
 
         rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
         if (rc)
             continue;
 
         /*
          * TODO: provide translation for non-NVDIMM_FAMILY_INTEL
          * devices (i.e. from nd_cmd to acpi_dsm) to standardize the
          * userspace interface.
          */
         cmd_mask = 1UL << ND_CMD_CALL;
         if (nfit_mem->family == NVDIMM_FAMILY_INTEL) {
             /*
              * These commands have a 1:1 correspondence
              * between DSM payload and libnvdimm ioctl
              * payload format.
              */
             cmd_mask |= nfit_mem->dsm_mask & NVDIMM_STANDARD_CMDMASK;
         }
 
         if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags)) {
             set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
             set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
         }
         if (test_bit(NFIT_MEM_LSW, &nfit_mem->flags))
             set_bit(ND_CMD_SET_CONFIG_DATA, &cmd_mask);
 
         flush = nfit_mem->nfit_flush ? nfit_mem->nfit_flush->flush
             : NULL;
         nvdimm = __nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
                 acpi_nfit_dimm_attribute_groups,
                 flags, cmd_mask, flush ? flush->hint_count : 0,
                 nfit_mem->flush_wpq, &nfit_mem->id[0],
                 acpi_nfit_get_security_ops(nfit_mem->family),
                 acpi_nfit_get_fw_ops(nfit_mem));
         if (!nvdimm)
             return -ENOMEM;
 
         nfit_mem->nvdimm = nvdimm;
         dimm_count++;
 
         if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
             continue;
 
         dev_err(acpi_desc->dev, "Error found in NVDIMM %s flags:%s%s%s%s%s\n",
                 nvdimm_name(nvdimm),
           mem_flags & ACPI_NFIT_MEM_SAVE_FAILED ? " save_fail" : "",
           mem_flags & ACPI_NFIT_MEM_RESTORE_FAILED ? " restore_fail":"",
           mem_flags & ACPI_NFIT_MEM_FLUSH_FAILED ? " flush_fail" : "",
           mem_flags & ACPI_NFIT_MEM_NOT_ARMED ? " not_armed" : "",
           mem_flags & ACPI_NFIT_MEM_MAP_FAILED ? " map_fail" : "");
 
     }
 
     rc = nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
     if (rc)
         return rc;
 
     /*
      * Now that dimms are successfully registered, and async registration
      * is flushed, attempt to enable event notification.
      */
     list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
         struct kernfs_node *nfit_kernfs;
 
         nvdimm = nfit_mem->nvdimm;
         if (!nvdimm)
             continue;
 
         nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit");
         if (nfit_kernfs)
             nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,
                     "flags");
         sysfs_put(nfit_kernfs);
         if (!nfit_mem->flags_attr)
             dev_warn(acpi_desc->dev, "%s: notifications disabled\n",
                     nvdimm_name(nvdimm));
     }
 
     return devm_add_action_or_reset(acpi_desc->dev, shutdown_dimm_notify,
             acpi_desc);
 }
 
 /*
  * These constants are private because there are no kernel consumers of
  * these commands.
  */
 enum nfit_aux_cmds {
     NFIT_CMD_TRANSLATE_SPA = 5,
     NFIT_CMD_ARS_INJECT_SET = 7,
     NFIT_CMD_ARS_INJECT_CLEAR = 8,
     NFIT_CMD_ARS_INJECT_GET = 9,
 };
 
 static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
 {
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
     const guid_t *guid = to_nfit_uuid(NFIT_DEV_BUS);
     unsigned long dsm_mask, *mask;
     struct acpi_device *adev;
     int i;
 
     set_bit(ND_CMD_CALL, &nd_desc->cmd_mask);
     set_bit(NVDIMM_BUS_FAMILY_NFIT, &nd_desc->bus_family_mask);
 
     /* enable nfit_test to inject bus command emulation */
     if (acpi_desc->bus_cmd_force_en) {
         nd_desc->cmd_mask = acpi_desc->bus_cmd_force_en;
         mask = &nd_desc->bus_family_mask;
         if (acpi_desc->family_dsm_mask[NVDIMM_BUS_FAMILY_INTEL]) {
             set_bit(NVDIMM_BUS_FAMILY_INTEL, mask);
             nd_desc->fw_ops = intel_bus_fw_ops;
         }
     }
 
     adev = to_acpi_dev(acpi_desc);
     if (!adev)
         return;
 
     for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++)
         if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
             set_bit(i, &nd_desc->cmd_mask);
 
     dsm_mask =
         (1 << ND_CMD_ARS_CAP) |
         (1 << ND_CMD_ARS_START) |
         (1 << ND_CMD_ARS_STATUS) |
         (1 << ND_CMD_CLEAR_ERROR) |
         (1 << NFIT_CMD_TRANSLATE_SPA) |
         (1 << NFIT_CMD_ARS_INJECT_SET) |
         (1 << NFIT_CMD_ARS_INJECT_CLEAR) |
         (1 << NFIT_CMD_ARS_INJECT_GET);
     for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
         if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
             set_bit(i, &acpi_desc->bus_dsm_mask);
 
     /* Enumerate allowed NVDIMM_BUS_FAMILY_INTEL commands */
     dsm_mask = NVDIMM_BUS_INTEL_FW_ACTIVATE_CMDMASK;
     guid = to_nfit_bus_uuid(NVDIMM_BUS_FAMILY_INTEL);
     mask = &acpi_desc->family_dsm_mask[NVDIMM_BUS_FAMILY_INTEL];
     for_each_set_bit(i, &dsm_mask, BITS_PER_LONG)
         if (acpi_check_dsm(adev->handle, guid, 1, 1ULL << i))
             set_bit(i, mask);
 
     if (*mask == dsm_mask) {
         set_bit(NVDIMM_BUS_FAMILY_INTEL, &nd_desc->bus_family_mask);
         nd_desc->fw_ops = intel_bus_fw_ops;
     }
 }
 
 static ssize_t range_index_show(struct device *dev,
         struct device_attribute *attr, char *buf)
 {
     struct nd_region *nd_region = to_nd_region(dev);
     struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
 
     return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
 }
 static DEVICE_ATTR_RO(range_index);
 
 static struct attribute *acpi_nfit_region_attributes[] = {
     &dev_attr_range_index.attr,
     NULL,
 };
 
 static const struct attribute_group acpi_nfit_region_attribute_group = {
     .name = "nfit",
     .attrs = acpi_nfit_region_attributes,
 };
 
 static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
     &acpi_nfit_region_attribute_group,
     NULL,
 };
 
 /* enough info to uniquely specify an interleave set */
 struct nfit_set_info {
     u64 region_offset;
     u32 serial_number;
     u32 pad;
 };
 
 struct nfit_set_info2 {
     u64 region_offset;
     u32 serial_number;
     u16 vendor_id;
     u16 manufacturing_date;
     u8 manufacturing_location;
     u8 reserved[31];
 };
 
 static int cmp_map_compat(const void *m0, const void *m1)
 {
     const struct nfit_set_info *map0 = m0;
     const struct nfit_set_info *map1 = m1;
 
     return memcmp(&map0->region_offset, &map1->region_offset,
             sizeof(u64));
 }
 
 static int cmp_map(const void *m0, const void *m1)
 {
     const struct nfit_set_info *map0 = m0;
     const struct nfit_set_info *map1 = m1;
 
     if (map0->region_offset < map1->region_offset)
         return -1;
     else if (map0->region_offset > map1->region_offset)
         return 1;
     return 0;
 }
 
 static int cmp_map2(const void *m0, const void *m1)
 {
     const struct nfit_set_info2 *map0 = m0;
     const struct nfit_set_info2 *map1 = m1;
 
     if (map0->region_offset < map1->region_offset)
         return -1;
     else if (map0->region_offset > map1->region_offset)
         return 1;
     return 0;
 }
 
 /* Retrieve the nth entry referencing this spa */
 static struct acpi_nfit_memory_map *memdev_from_spa(
         struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
 {
     struct nfit_memdev *nfit_memdev;
 
     list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
         if (nfit_memdev->memdev->range_index == range_index)
             if (n-- == 0)
                 return nfit_memdev->memdev;
     return NULL;
 }
 
 static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
         struct nd_region_desc *ndr_desc,
         struct acpi_nfit_system_address *spa)
 {
     struct device *dev = acpi_desc->dev;
     struct nd_interleave_set *nd_set;
     u16 nr = ndr_desc->num_mappings;
     struct nfit_set_info2 *info2;
     struct nfit_set_info *info;
     int i;
 
     nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
     if (!nd_set)
         return -ENOMEM;
     import_guid(&nd_set->type_guid, spa->range_guid);
 
     info = devm_kcalloc(dev, nr, sizeof(*info), GFP_KERNEL);
     if (!info)
         return -ENOMEM;
 
     info2 = devm_kcalloc(dev, nr, sizeof(*info2), GFP_KERNEL);
     if (!info2)
         return -ENOMEM;
 
     for (i = 0; i < nr; i++) {
         struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
         struct nvdimm *nvdimm = mapping->nvdimm;
         struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
         struct nfit_set_info *map = &info[i];
         struct nfit_set_info2 *map2 = &info2[i];
         struct acpi_nfit_memory_map *memdev =
             memdev_from_spa(acpi_desc, spa->range_index, i);
         struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
 
         if (!memdev || !nfit_mem->dcr) {
             dev_err(dev, "%s: failed to find DCR\n", __func__);
             return -ENODEV;
         }
 
         map->region_offset = memdev->region_offset;
         map->serial_number = dcr->serial_number;
 
         map2->region_offset = memdev->region_offset;
         map2->serial_number = dcr->serial_number;
         map2->vendor_id = dcr->vendor_id;
         map2->manufacturing_date = dcr->manufacturing_date;
         map2->manufacturing_location = dcr->manufacturing_location;
     }
 
     /* v1.1 namespaces */
     sort(info, nr, sizeof(*info), cmp_map, NULL);
     nd_set->cookie1 = nd_fletcher64(info, sizeof(*info) * nr, 0);
 
     /* v1.2 namespaces */
     sort(info2, nr, sizeof(*info2), cmp_map2, NULL);
     nd_set->cookie2 = nd_fletcher64(info2, sizeof(*info2) * nr, 0);
 
     /* support v1.1 namespaces created with the wrong sort order */
     sort(info, nr, sizeof(*info), cmp_map_compat, NULL);
     nd_set->altcookie = nd_fletcher64(info, sizeof(*info) * nr, 0);
 
     /* record the result of the sort for the mapping position */
     for (i = 0; i < nr; i++) {
         struct nfit_set_info2 *map2 = &info2[i];
         int j;
 
         for (j = 0; j < nr; j++) {
             struct nd_mapping_desc *mapping = &ndr_desc->mapping[j];
             struct nvdimm *nvdimm = mapping->nvdimm;
             struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
             struct acpi_nfit_control_region *dcr = nfit_mem->dcr;
 
             if (map2->serial_number == dcr->serial_number &&
                 map2->vendor_id == dcr->vendor_id &&
                 map2->manufacturing_date == dcr->manufacturing_date &&
                 map2->manufacturing_location
                     == dcr->manufacturing_location) {
                 mapping->position = i;
                 break;
             }
         }
     }
 
     ndr_desc->nd_set = nd_set;
     devm_kfree(dev, info);
     devm_kfree(dev, info2);
 
     return 0;
 }
 
 static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
         struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
 {
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
     struct acpi_nfit_system_address *spa = nfit_spa->spa;
     int cmd_rc, rc;
 
     cmd->address = spa->address;
     cmd->length = spa->length;
     rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
             sizeof(*cmd), &cmd_rc);
     if (rc < 0)
         return rc;
     return cmd_rc;
 }
 
 static int ars_start(struct acpi_nfit_desc *acpi_desc,
         struct nfit_spa *nfit_spa, enum nfit_ars_state req_type)
 {
     int rc;
     int cmd_rc;
     struct nd_cmd_ars_start ars_start;
     struct acpi_nfit_system_address *spa = nfit_spa->spa;
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
 
     memset(&ars_start, 0, sizeof(ars_start));
     ars_start.address = spa->address;
     ars_start.length = spa->length;
     if (req_type == ARS_REQ_SHORT)
         ars_start.flags = ND_ARS_RETURN_PREV_DATA;
     if (nfit_spa_type(spa) == NFIT_SPA_PM)
         ars_start.type = ND_ARS_PERSISTENT;
     else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE)
         ars_start.type = ND_ARS_VOLATILE;
     else
         return -ENOTTY;
 
     rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
             sizeof(ars_start), &cmd_rc);
 
     if (rc < 0)
         return rc;
     if (cmd_rc < 0)
         return cmd_rc;
     set_bit(ARS_VALID, &acpi_desc->scrub_flags);
     return 0;
 }
 
 static int ars_continue(struct acpi_nfit_desc *acpi_desc)
 {
     int rc, cmd_rc;
     struct nd_cmd_ars_start ars_start;
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
     struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
 
     ars_start = (struct nd_cmd_ars_start) {
         .address = ars_status->restart_address,
         .length = ars_status->restart_length,
         .type = ars_status->type,
     };
     rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start,
             sizeof(ars_start), &cmd_rc);
     if (rc < 0)
         return rc;
     return cmd_rc;
 }
 
 static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
 {
     struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
     struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
     int rc, cmd_rc;
 
     rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status,
             acpi_desc->max_ars, &cmd_rc);
     if (rc < 0)
         return rc;
     return cmd_rc;
 }
 
 static void ars_complete(struct acpi_nfit_desc *acpi_desc,
         struct nfit_spa *nfit_spa)
 {
     struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
     struct acpi_nfit_system_address *spa = nfit_spa->spa;
     struct nd_region *nd_region = nfit_spa->nd_region;
     struct device *dev;
 
     lockdep_assert_held(&acpi_desc->init_mutex);
     /*
      * Only advance the ARS state for ARS runs initiated by the
      * kernel, ignore ARS results from BIOS initiated runs for scrub
      * completion tracking.
      */
     if (acpi_desc->scrub_spa != nfit_spa)
         return;
 
     if ((ars_status->address >= spa->address && ars_status->address
                 < spa->address + spa->length)
             || (ars_status->address < spa->address)) {
         /*
          * Assume that if a scrub starts at an offset from the
          * start of nfit_spa that we are in the continuation
          * case.
          *
          * Otherwise, if the scrub covers the spa range, mark
          * any pending request complete.
          */
         if (ars_status->address + ars_status->length
                 >= spa->address + spa->length)
                 /* complete */;
         else
             return;
     } else
         return;
 
     acpi_desc->scrub_spa = NULL;
     if (nd_region) {
         dev = nd_region_dev(nd_region);
         nvdimm_region_notify(nd_region, NVDIMM_REVALIDATE_POISON);
     } else
         dev = acpi_desc->dev;
     dev_dbg(dev, "ARS: range %d complete\n", spa->range_index);
 }
 
 static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc)
 {
     struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
     struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status;
     int rc;
     u32 i;
 
     /*
      * First record starts at 44 byte offset from the start of the
      * payload.
      */
     if (ars_status->out_length < 44)
         return 0;
 
     /*
      * Ignore potentially stale results that are only refreshed
      * after a start-ARS event.
      */
     if (!test_and_clear_bit(ARS_VALID, &acpi_desc->scrub_flags)) {
         dev_dbg(acpi_desc->dev, "skip %d stale records\n",
                 ars_status->num_records);
         return 0;
     }
 
     for (i = 0; i < ars_status->num_records; i++) {
         /* only process full records */
         if (ars_status->out_length
                 < 44 + sizeof(struct nd_ars_record) * (i + 1))
             break;
         rc = nvdimm_bus_add_badrange(nvdimm_bus,
                 ars_status->records[i].err_address,
                 ars_status->records[i].length);
         if (rc)
             return rc;
     }
     if (i < ars_status->num_records)
         dev_warn(acpi_desc->dev, "detected truncated ars results\n");
 
     return 0;
 }
 
 static void acpi_nfit_remove_resource(void *data)
 {
     struct resource *res = data;
 
     remove_resource(res);
 }
 
 static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc,
         struct nd_region_desc *ndr_desc)
 {
     struct resource *res, *nd_res = ndr_desc->res;
     int is_pmem, ret;
 
     /* No operation if the region is already registered as PMEM */
     is_pmem = region_intersects(nd_res->start, resource_size(nd_res),
                 IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY);
     if (is_pmem == REGION_INTERSECTS)
         return 0;
 
     res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL);
     if (!res)
         return -ENOMEM;
 
     res->name = "Persistent Memory";
     res->start = nd_res->start;
     res->end = nd_res->end;
     res->flags = IORESOURCE_MEM;
     res->desc = IORES_DESC_PERSISTENT_MEMORY;
 
     ret = insert_resource(&iomem_resource, res);
     if (ret)
         return ret;
 
     ret = devm_add_action_or_reset(acpi_desc->dev,
                     acpi_nfit_remove_resource,
                     res);
     if (ret)
         return ret;
 
     return 0;
 }
 
 static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
         struct nd_mapping_desc *mapping, struct nd_region_desc *ndr_desc,
         struct acpi_nfit_memory_map *memdev,
         struct nfit_spa *nfit_spa)
 {
     struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
             memdev->device_handle);
     struct acpi_nfit_system_address *spa = nfit_spa->spa;
 
     if (!nvdimm) {
         dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
                 spa->range_index, memdev->device_handle);
         return -ENODEV;
     }
 
     mapping->nvdimm = nvdimm;
     switch (nfit_spa_type(spa)) {
     case NFIT_SPA_PM:
     case NFIT_SPA_VOLATILE:
         mapping->start = memdev->address;
         mapping->size = memdev->region_size;
         break;
     }
 
     return 0;
 }
 
 static bool nfit_spa_is_virtual(struct acpi_nfit_system_address *spa)
 {
     return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
         nfit_spa_type(spa) == NFIT_SPA_VCD   ||
         nfit_spa_type(spa) == NFIT_SPA_PDISK ||
         nfit_spa_type(spa) == NFIT_SPA_PCD);
 }
 
 static bool nfit_spa_is_volatile(struct acpi_nfit_system_address *spa)
 {
     return (nfit_spa_type(spa) == NFIT_SPA_VDISK ||
         nfit_spa_type(spa) == NFIT_SPA_VCD   ||
         nfit_spa_type(spa) == NFIT_SPA_VOLATILE);
 }
 
 static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
         struct nfit_spa *nfit_spa)
 {
     static struct nd_mapping_desc mappings[ND_MAX_MAPPINGS];
     struct acpi_nfit_system_address *spa = nfit_spa->spa;
     struct nd_region_desc *ndr_desc, _ndr_desc;
     struct nfit_memdev *nfit_memdev;
     struct nvdimm_bus *nvdimm_bus;
     struct resource res;
     int count = 0, rc;
 
     if (nfit_spa->nd_region)
         return 0;
 
     if (spa->range_index == 0 && !nfit_spa_is_virtual(spa)) {
         dev_dbg(acpi_desc->dev, "detected invalid spa index\n");
         return 0;
     }
 
     memset(&res, 0, sizeof(res));
     memset(&mappings, 0, sizeof(mappings));
     memset(&_ndr_desc, 0, sizeof(_ndr_desc));
     res.start = spa->address;
     res.end = res.start + spa->length - 1;
     ndr_desc = &_ndr_desc;
     ndr_desc->res = &res;
     ndr_desc->provider_data = nfit_spa;
     ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
     if (spa->flags & ACPI_NFIT_PROXIMITY_VALID) {
         ndr_desc->numa_node = pxm_to_online_node(spa->proximity_domain);
         ndr_desc->target_node = pxm_to_node(spa->proximity_domain);
     } else {
         ndr_desc->numa_node = NUMA_NO_NODE;
         ndr_desc->target_node = NUMA_NO_NODE;
     }
 
     /* Fallback to address based numa information if node lookup failed */
     if (ndr_desc->numa_node == NUMA_NO_NODE) {
         ndr_desc->numa_node = memory_add_physaddr_to_nid(spa->address);
         dev_info(acpi_desc->dev, "changing numa node from %d to %d for nfit region [%pa-%pa]",
             NUMA_NO_NODE, ndr_desc->numa_node, &res.start, &res.end);
     }
     if (ndr_desc->target_node == NUMA_NO_NODE) {
         ndr_desc->target_node = phys_to_target_node(spa->address);
         dev_info(acpi_desc->dev, "changing target node from %d to %d for nfit region [%pa-%pa]",
             NUMA_NO_NODE, ndr_desc->numa_node, &res.start, &res.end);
     }
 
     /*
      * Persistence domain bits are hierarchical, if
      * ACPI_NFIT_CAPABILITY_CACHE_FLUSH is set then
      * ACPI_NFIT_CAPABILITY_MEM_FLUSH is implied.
      */
     if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_CACHE_FLUSH)
         set_bit(ND_REGION_PERSIST_CACHE, &ndr_desc->flags);
     else if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_MEM_FLUSH)
         set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc->flags);
 
     list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
         struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
         struct nd_mapping_desc *mapping;
 
         /* range index 0 == unmapped in SPA or invalid-SPA */
         if (memdev->range_index == 0 || spa->range_index == 0)
             continue;
         if (memdev->range_index != spa->range_index)
             continue;
         if (count >= ND_MAX_MAPPINGS) {
             dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n",
                     spa->range_index, ND_MAX_MAPPINGS);
             return -ENXIO;
         }
         mapping = &mappings[count++];
         rc = acpi_nfit_init_mapping(acpi_desc, mapping, ndr_desc,
                 memdev, nfit_spa);
         if (rc)
             goto out;
     }
 
     ndr_desc->mapping = mappings;
     ndr_desc->num_mappings = count;
     rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
     if (rc)
         goto out;
 
     nvdimm_bus = acpi_desc->nvdimm_bus;
     if (nfit_spa_type(spa) == NFIT_SPA_PM) {
         rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc);
         if (rc) {
             dev_warn(acpi_desc->dev,
                 "failed to insert pmem resource to iomem: %d\n",
                 rc);
             goto out;
         }
 
         nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
                 ndr_desc);
         if (!nfit_spa->nd_region)
             rc = -ENOMEM;
     } else if (nfit_spa_is_volatile(spa)) {
         nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus,
                 ndr_desc);
         if (!nfit_spa->nd_region)
             rc = -ENOMEM;
     } else if (nfit_spa_is_virtual(spa)) {
         nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus,
                 ndr_desc);
         if (!nfit_spa->nd_region)
             rc = -ENOMEM;
     }
 
  out:
     if (rc)
         dev_err(acpi_desc->dev, "failed to register spa range %d\n",
                 nfit_spa->spa->range_index);
     return rc;
 }
 
 static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc)
 {
     struct device *dev = acpi_desc->dev;
     struct nd_cmd_ars_status *ars_status;
 
     if (acpi_desc->ars_status) {
         memset(acpi_desc->ars_status, 0, acpi_desc->max_ars);
         return 0;
     }
 
     ars_status = devm_kzalloc(dev, acpi_desc->max_ars, GFP_KERNEL);
     if (!ars_status)
         return -ENOMEM;
     acpi_desc->ars_status = ars_status;
     return 0;
 }
 
 static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc)
 {
     int rc;
 
     if (ars_status_alloc(acpi_desc))
         return -ENOMEM;
 
     rc = ars_get_status(acpi_desc);
 
     if (rc < 0 && rc != -ENOSPC)
         return rc;
 
     if (ars_status_process_records(acpi_desc))
         dev_err(acpi_desc->dev, "Failed to process ARS records\n");
 
     return rc;
 }
 
 static int ars_register(struct acpi_nfit_desc *acpi_desc,
         struct nfit_spa *nfit_spa)
 {
     int rc;
 
     if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
         return acpi_nfit_register_region(acpi_desc, nfit_spa);
 
     set_bit(ARS_REQ_SHORT, &nfit_spa->ars_state);
     if (!no_init_ars)
         set_bit(ARS_REQ_LONG, &nfit_spa->ars_state);
 
     switch (acpi_nfit_query_poison(acpi_desc)) {
     case 0:
     case -ENOSPC:
     case -EAGAIN:
         rc = ars_start(acpi_desc, nfit_spa, ARS_REQ_SHORT);
         /* shouldn't happen, try again later */
         if (rc == -EBUSY)
             break;
         if (rc) {
             set_bit(ARS_FAILED, &nfit_spa->ars_state);
             break;
         }
         clear_bit(ARS_REQ_SHORT, &nfit_spa->ars_state);
         rc = acpi_nfit_query_poison(acpi_desc);
         if (rc)
             break;
         acpi_desc->scrub_spa = nfit_spa;
         ars_complete(acpi_desc, nfit_spa);
         /*
          * If ars_complete() says we didn't complete the
          * short scrub, we'll try again with a long
          * request.
          */
         acpi_desc->scrub_spa = NULL;
         break;
     case -EBUSY:
     case -ENOMEM:
         /*
          * BIOS was using ARS, wait for it to complete (or
          * resources to become available) and then perform our
          * own scrubs.
          */
         break;
     default:
         set_bit(ARS_FAILED, &nfit_spa->ars_state);
         break;
     }
 
     return acpi_nfit_register_region(acpi_desc, nfit_spa);
 }
 
 static void ars_complete_all(struct acpi_nfit_desc *acpi_desc)
 {
     struct nfit_spa *nfit_spa;
 
     list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
         if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
             continue;
         ars_complete(acpi_desc, nfit_spa);
     }
 }
 
 static unsigned int __acpi_nfit_scrub(struct acpi_nfit_desc *acpi_desc,
         int query_rc)
 {
     unsigned int tmo = acpi_desc->scrub_tmo;
     struct device *dev = acpi_desc->dev;
     struct nfit_spa *nfit_spa;
 
     lockdep_assert_held(&acpi_desc->init_mutex);
 
     if (test_bit(ARS_CANCEL, &acpi_desc->scrub_flags))
         return 0;
 
     if (query_rc == -EBUSY) {
         dev_dbg(dev, "ARS: ARS busy\n");
         return min(30U * 60U, tmo * 2);
     }
     if (query_rc == -ENOSPC) {
         dev_dbg(dev, "ARS: ARS continue\n");
         ars_continue(acpi_desc);
         return 1;
     }
     if (query_rc && query_rc != -EAGAIN) {
         unsigned long long addr, end;
 
         addr = acpi_desc->ars_status->address;
         end = addr + acpi_desc->ars_status->length;
         dev_dbg(dev, "ARS: %llx-%llx failed (%d)\n", addr, end,
                 query_rc);
     }
 
     ars_complete_all(acpi_desc);
     list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
         enum nfit_ars_state req_type;
         int rc;
 
         if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
             continue;
 
         /* prefer short ARS requests first */
         if (test_bit(ARS_REQ_SHORT, &nfit_spa->ars_state))
             req_type = ARS_REQ_SHORT;
         else if (test_bit(ARS_REQ_LONG, &nfit_spa->ars_state))
             req_type = ARS_REQ_LONG;
         else
             continue;
         rc = ars_start(acpi_desc, nfit_spa, req_type);
 
         dev = nd_region_dev(nfit_spa->nd_region);
         dev_dbg(dev, "ARS: range %d ARS start %s (%d)\n",
                 nfit_spa->spa->range_index,
                 req_type == ARS_REQ_SHORT ? "short" : "long",
                 rc);
         /*
          * Hmm, we raced someone else starting ARS? Try again in
          * a bit.
          */
         if (rc == -EBUSY)
             return 1;
         if (rc == 0) {
             dev_WARN_ONCE(dev, acpi_desc->scrub_spa,
                     "scrub start while range %d active\n",
                     acpi_desc->scrub_spa->spa->range_index);
             clear_bit(req_type, &nfit_spa->ars_state);
             acpi_desc->scrub_spa = nfit_spa;
             /*
              * Consider this spa last for future scrub
              * requests
              */
             list_move_tail(&nfit_spa->list, &acpi_desc->spas);
             return 1;
         }
 
         dev_err(dev, "ARS: range %d ARS failed (%d)\n",
                 nfit_spa->spa->range_index, rc);
         set_bit(ARS_FAILED, &nfit_spa->ars_state);
     }
     return 0;
 }
 
 static void __sched_ars(struct acpi_nfit_desc *acpi_desc, unsigned int tmo)
 {
     lockdep_assert_held(&acpi_desc->init_mutex);
 
     set_bit(ARS_BUSY, &acpi_desc->scrub_flags);
     /* note this should only be set from within the workqueue */
     if (tmo)
         acpi_desc->scrub_tmo = tmo;
     queue_delayed_work(nfit_wq, &acpi_desc->dwork, tmo * HZ);
 }
 
 static void sched_ars(struct acpi_nfit_desc *acpi_desc)
 {
     __sched_ars(acpi_desc, 0);
 }
 
 static void notify_ars_done(struct acpi_nfit_desc *acpi_desc)
 {
     lockdep_assert_held(&acpi_desc->init_mutex);
 
     clear_bit(ARS_BUSY, &acpi_desc->scrub_flags);
     acpi_desc->scrub_count++;
     if (acpi_desc->scrub_count_state)
         sysfs_notify_dirent(acpi_desc->scrub_count_state);
 }
 
 static void acpi_nfit_scrub(struct work_struct *work)
 {
     struct acpi_nfit_desc *acpi_desc;
     unsigned int tmo;
     int query_rc;
 
     acpi_desc = container_of(work, typeof(*acpi_desc), dwork.work);
     mutex_lock(&acpi_desc->init_mutex);
     query_rc = acpi_nfit_query_poison(acpi_desc);
     tmo = __acpi_nfit_scrub(acpi_desc, query_rc);
     if (tmo)
         __sched_ars(acpi_desc, tmo);
     else
         notify_ars_done(acpi_desc);
     memset(acpi_desc->ars_status, 0, acpi_desc->max_ars);
     clear_bit(ARS_POLL, &acpi_desc->scrub_flags);
     mutex_unlock(&acpi_desc->init_mutex);
 }
 
 static void acpi_nfit_init_ars(struct acpi_nfit_desc *acpi_desc,
         struct nfit_spa *nfit_spa)
 {
     int type = nfit_spa_type(nfit_spa->spa);
     struct nd_cmd_ars_cap ars_cap;
     int rc;
 
     set_bit(ARS_FAILED, &nfit_spa->ars_state);
     memset(&ars_cap, 0, sizeof(ars_cap));
     rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa);
     if (rc < 0)
         return;
     /* check that the supported scrub types match the spa type */
     if (type == NFIT_SPA_VOLATILE && ((ars_cap.status >> 16)
                 & ND_ARS_VOLATILE) == 0)
         return;
     if (type == NFIT_SPA_PM && ((ars_cap.status >> 16)
                 & ND_ARS_PERSISTENT) == 0)
         return;
 
     nfit_spa->max_ars = ars_cap.max_ars_out;
     nfit_spa->clear_err_unit = ars_cap.clear_err_unit;
     acpi_desc->max_ars = max(nfit_spa->max_ars, acpi_desc->max_ars);
     clear_bit(ARS_FAILED, &nfit_spa->ars_state);
 }
 
 static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
 {
     struct nfit_spa *nfit_spa;
     int rc, do_sched_ars = 0;
 
     set_bit(ARS_VALID, &acpi_desc->scrub_flags);
     list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
         switch (nfit_spa_type(nfit_spa->spa)) {
         case NFIT_SPA_VOLATILE:
         case NFIT_SPA_PM:
             acpi_nfit_init_ars(acpi_desc, nfit_spa);
             break;
         }
     }
 
     list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
         switch (nfit_spa_type(nfit_spa->spa)) {
         case NFIT_SPA_VOLATILE:
         case NFIT_SPA_PM:
             /* register regions and kick off initial ARS run */
             rc = ars_register(acpi_desc, nfit_spa);
             if (rc)
                 return rc;
 
             /*
              * Kick off background ARS if at least one
              * region successfully registered ARS
              */
             if (!test_bit(ARS_FAILED, &nfit_spa->ars_state))
                 do_sched_ars++;
             break;
         case NFIT_SPA_BDW:
             /* nothing to register */
             break;
         case NFIT_SPA_DCR:
         case NFIT_SPA_VDISK:
         case NFIT_SPA_VCD:
         case NFIT_SPA_PDISK:
         case NFIT_SPA_PCD:
             /* register known regions that don't support ARS */
             rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
             if (rc)
                 return rc;
             break;
         default:
             /* don't register unknown regions */
             break;
         }
     }
 
     if (do_sched_ars)
         sched_ars(acpi_desc);
     return 0;
 }
 
 static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
         struct nfit_table_prev *prev)
 {
     struct device *dev = acpi_desc->dev;
 
     if (!list_empty(&prev->spas) ||
             !list_empty(&prev->memdevs) ||
             !list_empty(&prev->dcrs) ||
             !list_empty(&prev->bdws) ||
             !list_empty(&prev->idts) ||
             !list_empty(&prev->flushes)) {
         dev_err(dev, "new nfit deletes entries (unsupported)\n");
         return -ENXIO;
     }
     return 0;
 }
 
 static int acpi_nfit_desc_init_scrub_attr(struct acpi_nfit_desc *acpi_desc)
 {
     struct device *dev = acpi_desc->dev;
     struct kernfs_node *nfit;
     struct device *bus_dev;
 
     if (!ars_supported(acpi_desc->nvdimm_bus))
         return 0;
 
     bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
     nfit = sysfs_get_dirent(bus_dev->kobj.sd, "nfit");
     if (!nfit) {
         dev_err(dev, "sysfs_get_dirent 'nfit' failed\n");
         return -ENODEV;
     }
     acpi_desc->scrub_count_state = sysfs_get_dirent(nfit, "scrub");
     sysfs_put(nfit);
     if (!acpi_desc->scrub_count_state) {
         dev_err(dev, "sysfs_get_dirent 'scrub' failed\n");
         return -ENODEV;
     }
 
     return 0;
 }
 
 static void acpi_nfit_unregister(void *data)
 {
     struct acpi_nfit_desc *acpi_desc = data;
 
     nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
 }
 
 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz)
 {
     struct device *dev = acpi_desc->dev;
     struct nfit_table_prev prev;
     const void *end;
     int rc;
 
     if (!acpi_desc->nvdimm_bus) {
         acpi_nfit_init_dsms(acpi_desc);
 
         acpi_desc->nvdimm_bus = nvdimm_bus_register(dev,
                 &acpi_desc->nd_desc);
         if (!acpi_desc->nvdimm_bus)
             return -ENOMEM;
 
         rc = devm_add_action_or_reset(dev, acpi_nfit_unregister,
                 acpi_desc);
         if (rc)
             return rc;
 
         rc = acpi_nfit_desc_init_scrub_attr(acpi_desc);
         if (rc)
             return rc;
 
         /* register this acpi_desc for mce notifications */
         mutex_lock(&acpi_desc_lock);
         list_add_tail(&acpi_desc->list, &acpi_descs);
         mutex_unlock(&acpi_desc_lock);
     }
 
     mutex_lock(&acpi_desc->init_mutex);
 
     INIT_LIST_HEAD(&prev.spas);
     INIT_LIST_HEAD(&prev.memdevs);
     INIT_LIST_HEAD(&prev.dcrs);
     INIT_LIST_HEAD(&prev.bdws);
     INIT_LIST_HEAD(&prev.idts);
     INIT_LIST_HEAD(&prev.flushes);
 
     list_cut_position(&prev.spas, &acpi_desc->spas,
                 acpi_desc->spas.prev);
     list_cut_position(&prev.memdevs, &acpi_desc->memdevs,
                 acpi_desc->memdevs.prev);
     list_cut_position(&prev.dcrs, &acpi_desc->dcrs,
                 acpi_desc->dcrs.prev);
     list_cut_position(&prev.bdws, &acpi_desc->bdws,
                 acpi_desc->bdws.prev);
     list_cut_position(&prev.idts, &acpi_desc->idts,
                 acpi_desc->idts.prev);
     list_cut_position(&prev.flushes, &acpi_desc->flushes,
                 acpi_desc->flushes.prev);
 
     end = data + sz;
     while (!IS_ERR_OR_NULL(data))
         data = add_table(acpi_desc, &prev, data, end);
 
     if (IS_ERR(data)) {
         dev_dbg(dev, "nfit table parsing error: %ld\n", PTR_ERR(data));
         rc = PTR_ERR(data);
         goto out_unlock;
     }
 
     rc = acpi_nfit_check_deletions(acpi_desc, &prev);
     if (rc)
         goto out_unlock;
 
     rc = nfit_mem_init(acpi_desc);
     if (rc)
         goto out_unlock;
 
     rc = acpi_nfit_register_dimms(acpi_desc);
     if (rc)
         goto out_unlock;
 
     rc = acpi_nfit_register_regions(acpi_desc);
 
  out_unlock:
     mutex_unlock(&acpi_desc->init_mutex);
     return rc;
 }
 EXPORT_SYMBOL_GPL(acpi_nfit_init);
 
 static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
 {
     struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
     struct device *dev = acpi_desc->dev;
 
     /* Bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
     device_lock(dev);
     device_unlock(dev);
 
     /* Bounce the init_mutex to complete initial registration */
     mutex_lock(&acpi_desc->init_mutex);
     mutex_unlock(&acpi_desc->init_mutex);
 
     return 0;
 }
 
 static int __acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
         struct nvdimm *nvdimm, unsigned int cmd)
 {
     struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
     if (nvdimm)
         return 0;
     if (cmd != ND_CMD_ARS_START)
         return 0;
 
     /*
      * The kernel and userspace may race to initiate a scrub, but
      * the scrub thread is prepared to lose that initial race.  It
      * just needs guarantees that any ARS it initiates are not
      * interrupted by any intervening start requests from userspace.
      */
     if (work_busy(&acpi_desc->dwork.work))
         return -EBUSY;
 
     return 0;
 }
 
 /*
  * Prevent security and firmware activate commands from being issued via
  * ioctl.
  */
 static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc,
         struct nvdimm *nvdimm, unsigned int cmd, void *buf)
 {
     struct nd_cmd_pkg *call_pkg = buf;
     unsigned int func;
 
     if (nvdimm && cmd == ND_CMD_CALL &&
             call_pkg->nd_family == NVDIMM_FAMILY_INTEL) {
         func = call_pkg->nd_command;
         if (func > NVDIMM_CMD_MAX ||
             (1 << func) & NVDIMM_INTEL_DENY_CMDMASK)
             return -EOPNOTSUPP;
     }
 
     /* block all non-nfit bus commands */
     if (!nvdimm && cmd == ND_CMD_CALL &&
             call_pkg->nd_family != NVDIMM_BUS_FAMILY_NFIT)
         return -EOPNOTSUPP;
 
     return __acpi_nfit_clear_to_send(nd_desc, nvdimm, cmd);
 }
 
 int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc,
         enum nfit_ars_state req_type)
 {
     struct device *dev = acpi_desc->dev;
     int scheduled = 0, busy = 0;
     struct nfit_spa *nfit_spa;
 
     mutex_lock(&acpi_desc->init_mutex);
     if (test_bit(ARS_CANCEL, &acpi_desc->scrub_flags)) {
         mutex_unlock(&acpi_desc->init_mutex);
         return 0;
     }
 
     list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
         int type = nfit_spa_type(nfit_spa->spa);
 
         if (type != NFIT_SPA_PM && type != NFIT_SPA_VOLATILE)
             continue;
         if (test_bit(ARS_FAILED, &nfit_spa->ars_state))
             continue;
 
         if (test_and_set_bit(req_type, &nfit_spa->ars_state))
             busy++;
         else
             scheduled++;
     }
     if (scheduled) {
         sched_ars(acpi_desc);
         dev_dbg(dev, "ars_scan triggered\n");
     }
     mutex_unlock(&acpi_desc->init_mutex);
 
     if (scheduled)
         return 0;
     if (busy)
         return -EBUSY;
     return -ENOTTY;
 }
 
 void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
 {
     struct nvdimm_bus_descriptor *nd_desc;
 
     dev_set_drvdata(dev, acpi_desc);
     acpi_desc->dev = dev;
     nd_desc = &acpi_desc->nd_desc;
     nd_desc->provider_name = "ACPI.NFIT";
     nd_desc->module = THIS_MODULE;
     nd_desc->ndctl = acpi_nfit_ctl;
     nd_desc->flush_probe = acpi_nfit_flush_probe;
     nd_desc->clear_to_send = acpi_nfit_clear_to_send;
     nd_desc->attr_groups = acpi_nfit_attribute_groups;
 
     INIT_LIST_HEAD(&acpi_desc->spas);
     INIT_LIST_HEAD(&acpi_desc->dcrs);
     INIT_LIST_HEAD(&acpi_desc->bdws);
     INIT_LIST_HEAD(&acpi_desc->idts);
     INIT_LIST_HEAD(&acpi_desc->flushes);
     INIT_LIST_HEAD(&acpi_desc->memdevs);
     INIT_LIST_HEAD(&acpi_desc->dimms);
     INIT_LIST_HEAD(&acpi_desc->list);
     mutex_init(&acpi_desc->init_mutex);
     acpi_desc->scrub_tmo = 1;
     INIT_DELAYED_WORK(&acpi_desc->dwork, acpi_nfit_scrub);
 }
 EXPORT_SYMBOL_GPL(acpi_nfit_desc_init);
 
 static void acpi_nfit_put_table(void *table)
 {
     acpi_put_table(table);
 }
 
 void acpi_nfit_shutdown(void *data)
 {
     struct acpi_nfit_desc *acpi_desc = data;
     struct device *bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
 
     /*
      * Destruct under acpi_desc_lock so that nfit_handle_mce does not
      * race teardown
      */
     mutex_lock(&acpi_desc_lock);
     list_del(&acpi_desc->list);
     mutex_unlock(&acpi_desc_lock);
 
     mutex_lock(&acpi_desc->init_mutex);
     set_bit(ARS_CANCEL, &acpi_desc->scrub_flags);
     cancel_delayed_work_sync(&acpi_desc->dwork);
     mutex_unlock(&acpi_desc->init_mutex);
 
     /*
      * Bounce the nvdimm bus lock to make sure any in-flight
      * acpi_nfit_ars_rescan() submissions have had a chance to
      * either submit or see ->cancel set.
      */
     device_lock(bus_dev);
     device_unlock(bus_dev);
 
     flush_workqueue(nfit_wq);
 }
 EXPORT_SYMBOL_GPL(acpi_nfit_shutdown);
 
 static int acpi_nfit_add(struct acpi_device *adev)
 {
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
     struct acpi_nfit_desc *acpi_desc;
     struct device *dev = &adev->dev;
     struct acpi_table_header *tbl;
     acpi_status status = AE_OK;
     acpi_size sz;
     int rc = 0;
 
     status = acpi_get_table(ACPI_SIG_NFIT, 0, &tbl);
     if (ACPI_FAILURE(status)) {
         /* The NVDIMM root device allows OS to trigger enumeration of
          * NVDIMMs through NFIT at boot time and re-enumeration at
          * root level via the _FIT method during runtime.
          * This is ok to return 0 here, we could have an nvdimm
          * hotplugged later and evaluate _FIT method which returns
          * data in the format of a series of NFIT Structures.
          */
         dev_dbg(dev, "failed to find NFIT at startup\n");
         return 0;
     }
 
     rc = devm_add_action_or_reset(dev, acpi_nfit_put_table, tbl);
     if (rc)
         return rc;
     sz = tbl->length;
 
     acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
     if (!acpi_desc)
         return -ENOMEM;
     acpi_nfit_desc_init(acpi_desc, &adev->dev);
 
     /* Save the acpi header for exporting the revision via sysfs */
     acpi_desc->acpi_header = *tbl;
 
     /* Evaluate _FIT and override with that if present */
     status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
     if (ACPI_SUCCESS(status) && buf.length > 0) {
         union acpi_object *obj = buf.pointer;
 
         if (obj->type == ACPI_TYPE_BUFFER)
             rc = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
                     obj->buffer.length);
         else
             dev_dbg(dev, "invalid type %d, ignoring _FIT\n",
                 (int) obj->type);
         kfree(buf.pointer);
     } else
         /* skip over the lead-in header table */
         rc = acpi_nfit_init(acpi_desc, (void *) tbl
                 + sizeof(struct acpi_table_nfit),
                 sz - sizeof(struct acpi_table_nfit));
 
     if (rc)
         return rc;
     return devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
 }
 
 static int acpi_nfit_remove(struct acpi_device *adev)
 {
     /* see acpi_nfit_unregister */
     return 0;
 }
 
 static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)
 {
     struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
     union acpi_object *obj;
     acpi_status status;
     int ret;
 
     if (!dev->driver) {
         /* dev->driver may be null if we're being removed */
         dev_dbg(dev, "no driver found for dev\n");
         return;
     }
 
     if (!acpi_desc) {
         acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
         if (!acpi_desc)
             return;
         acpi_nfit_desc_init(acpi_desc, dev);
     } else {
         /*
          * Finish previous registration before considering new
          * regions.
          */
         flush_workqueue(nfit_wq);
     }
 
     /* Evaluate _FIT */
     status = acpi_evaluate_object(handle, "_FIT", NULL, &buf);
     if (ACPI_FAILURE(status)) {
         dev_err(dev, "failed to evaluate _FIT\n");
         return;
     }
 
     obj = buf.pointer;
     if (obj->type == ACPI_TYPE_BUFFER) {
         ret = acpi_nfit_init(acpi_desc, obj->buffer.pointer,
                 obj->buffer.length);
         if (ret)
             dev_err(dev, "failed to merge updated NFIT\n");
     } else
         dev_err(dev, "Invalid _FIT\n");
     kfree(buf.pointer);
 }
 
 static void acpi_nfit_uc_error_notify(struct device *dev, acpi_handle handle)
 {
     struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
 
     if (acpi_desc->scrub_mode == HW_ERROR_SCRUB_ON)
         acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_LONG);
     else
         acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_SHORT);
 }
 
 void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
 {
     dev_dbg(dev, "event: 0x%x\n", event);
 
     switch (event) {
     case NFIT_NOTIFY_UPDATE:
         return acpi_nfit_update_notify(dev, handle);
     case NFIT_NOTIFY_UC_MEMORY_ERROR:
         return acpi_nfit_uc_error_notify(dev, handle);
     default:
         return;
     }
 }
 EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
 
 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
 {
     device_lock(&adev->dev);
     __acpi_nfit_notify(&adev->dev, adev->handle, event);
     device_unlock(&adev->dev);
 }
 
 static const struct acpi_device_id acpi_nfit_ids[] = {
     { "ACPI0012", 0 },
     { "", 0 },
 };
 MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids);
 
 static struct acpi_driver acpi_nfit_driver = {
     .name = KBUILD_MODNAME,
     .ids = acpi_nfit_ids,
     .ops = {
         .add = acpi_nfit_add,
         .remove = acpi_nfit_remove,
         .notify = acpi_nfit_notify,
     },
 };
 
 static __init int nfit_init(void)
 {
     int ret;
 
     BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 64);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40);
     BUILD_BUG_ON(sizeof(struct acpi_nfit_capabilities) != 16);
 
     guid_parse(UUID_VOLATILE_MEMORY, &nfit_uuid[NFIT_SPA_VOLATILE]);
     guid_parse(UUID_PERSISTENT_MEMORY, &nfit_uuid[NFIT_SPA_PM]);
     guid_parse(UUID_CONTROL_REGION, &nfit_uuid[NFIT_SPA_DCR]);
     guid_parse(UUID_DATA_REGION, &nfit_uuid[NFIT_SPA_BDW]);
     guid_parse(UUID_VOLATILE_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_VDISK]);
     guid_parse(UUID_VOLATILE_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_VCD]);
     guid_parse(UUID_PERSISTENT_VIRTUAL_DISK, &nfit_uuid[NFIT_SPA_PDISK]);
     guid_parse(UUID_PERSISTENT_VIRTUAL_CD, &nfit_uuid[NFIT_SPA_PCD]);
     guid_parse(UUID_NFIT_BUS, &nfit_uuid[NFIT_DEV_BUS]);
     guid_parse(UUID_NFIT_DIMM, &nfit_uuid[NFIT_DEV_DIMM]);
     guid_parse(UUID_NFIT_DIMM_N_HPE1, &nfit_uuid[NFIT_DEV_DIMM_N_HPE1]);
     guid_parse(UUID_NFIT_DIMM_N_HPE2, &nfit_uuid[NFIT_DEV_DIMM_N_HPE2]);
     guid_parse(UUID_NFIT_DIMM_N_MSFT, &nfit_uuid[NFIT_DEV_DIMM_N_MSFT]);
     guid_parse(UUID_NFIT_DIMM_N_HYPERV, &nfit_uuid[NFIT_DEV_DIMM_N_HYPERV]);
     guid_parse(UUID_INTEL_BUS, &nfit_uuid[NFIT_BUS_INTEL]);
 
     nfit_wq = create_singlethread_workqueue("nfit");
     if (!nfit_wq)
         return -ENOMEM;
 
     nfit_mce_register();
     ret = acpi_bus_register_driver(&acpi_nfit_driver);
     if (ret) {
         nfit_mce_unregister();
         destroy_workqueue(nfit_wq);
     }
 
     return ret;
 
 }
 
 static __exit void nfit_exit(void)
 {
     nfit_mce_unregister();
     acpi_bus_unregister_driver(&acpi_nfit_driver);
     destroy_workqueue(nfit_wq);
     WARN_ON(!list_empty(&acpi_descs));
 }
 
 module_init(nfit_init);
 module_exit(nfit_exit);
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Intel Corporation");