File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
new file mode 100644
index 0000000..67d7489
--- /dev/null
+++ b/drivers/acpi/nfit.c
@@ -0,0 +1,1922 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/list_sort.h>
+#include <linux/libnvdimm.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ndctl.h>
+#include <linux/list.h>
+#include <linux/acpi.h>
+#include <linux/sort.h>
+#include <linux/pmem.h>
+#include <linux/io.h>
+#include <asm/cacheflush.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");
+
+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 u8 nfit_uuid[NFIT_UUID_MAX][16];
+
+const u8 *to_nfit_uuid(enum nfit_uuids id)
+{
+ return nfit_uuid[id];
+}
+EXPORT_SYMBOL(to_nfit_uuid);
+
+static struct acpi_nfit_desc *to_acpi_nfit_desc(
+ struct nvdimm_bus_descriptor *nd_desc)
+{
+ return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
+}
+
+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 acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len)
+{
+ struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
+ const struct nd_cmd_desc *desc = NULL;
+ union acpi_object in_obj, in_buf, *out_obj;
+ struct device *dev = acpi_desc->dev;
+ const char *cmd_name, *dimm_name;
+ unsigned long dsm_mask;
+ acpi_handle handle;
+ const u8 *uuid;
+ u32 offset;
+ int rc, i;
+
+ if (nvdimm) {
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct acpi_device *adev = nfit_mem->adev;
+
+ if (!adev)
+ return -ENOTTY;
+ dimm_name = nvdimm_name(nvdimm);
+ cmd_name = nvdimm_cmd_name(cmd);
+ dsm_mask = nfit_mem->dsm_mask;
+ desc = nd_cmd_dimm_desc(cmd);
+ uuid = to_nfit_uuid(NFIT_DEV_DIMM);
+ handle = adev->handle;
+ } else {
+ struct acpi_device *adev = to_acpi_dev(acpi_desc);
+
+ cmd_name = nvdimm_bus_cmd_name(cmd);
+ dsm_mask = nd_desc->dsm_mask;
+ desc = nd_cmd_bus_desc(cmd);
+ uuid = to_nfit_uuid(NFIT_DEV_BUS);
+ handle = adev->handle;
+ dimm_name = "bus";
+ }
+
+ if (!desc || (cmd && (desc->out_num + desc->in_num == 0)))
+ return -ENOTTY;
+
+ if (!test_bit(cmd, &dsm_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 (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
+ dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__,
+ dimm_name, cmd_name, in_buf.buffer.length);
+ print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4,
+ 4, in_buf.buffer.pointer, min_t(u32, 128,
+ in_buf.buffer.length), true);
+ }
+
+ out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj);
+ if (!out_obj) {
+ dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name,
+ cmd_name);
+ return -EINVAL;
+ }
+
+ if (out_obj->package.type != ACPI_TYPE_BUFFER) {
+ dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n",
+ __func__, dimm_name, cmd_name, out_obj->type);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) {
+ dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__,
+ 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);
+ }
+
+ 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);
+
+ if (offset + out_size > out_obj->buffer.length) {
+ dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
+ __func__, dimm_name, cmd_name, i);
+ break;
+ }
+
+ if (in_buf.buffer.length + offset + out_size > buf_len) {
+ dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n",
+ __func__, 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;
+ }
+ 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;
+ } 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;
+
+ out:
+ ACPI_FREE(out_obj);
+
+ return rc;
+}
+
+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];
+}
+
+static int nfit_spa_type(struct acpi_nfit_system_address *spa)
+{
+ int i;
+
+ for (i = 0; i < NFIT_UUID_MAX; i++)
+ if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
+ return i;
+ return -1;
+}
+
+static bool add_spa(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_table_prev *prev,
+ struct acpi_nfit_system_address *spa)
+{
+ size_t length = min_t(size_t, sizeof(*spa), spa->header.length);
+ struct device *dev = acpi_desc->dev;
+ struct nfit_spa *nfit_spa;
+
+ list_for_each_entry(nfit_spa, &prev->spas, list) {
+ if (memcmp(nfit_spa->spa, spa, length) == 0) {
+ list_move_tail(&nfit_spa->list, &acpi_desc->spas);
+ return true;
+ }
+ }
+
+ nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);
+ if (!nfit_spa)
+ return false;
+ INIT_LIST_HEAD(&nfit_spa->list);
+ nfit_spa->spa = spa;
+ list_add_tail(&nfit_spa->list, &acpi_desc->spas);
+ dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__,
+ 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)
+{
+ size_t length = min_t(size_t, sizeof(*memdev), memdev->header.length);
+ struct device *dev = acpi_desc->dev;
+ struct nfit_memdev *nfit_memdev;
+
+ list_for_each_entry(nfit_memdev, &prev->memdevs, list)
+ if (memcmp(nfit_memdev->memdev, memdev, length) == 0) {
+ list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);
+ return true;
+ }
+
+ nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);
+ if (!nfit_memdev)
+ return false;
+ INIT_LIST_HEAD(&nfit_memdev->list);
+ nfit_memdev->memdev = memdev;
+ list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs);
+ dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n",
+ __func__, memdev->device_handle, memdev->range_index,
+ memdev->region_index);
+ return true;
+}
+
+static bool add_dcr(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_table_prev *prev,
+ struct acpi_nfit_control_region *dcr)
+{
+ size_t length = min_t(size_t, sizeof(*dcr), dcr->header.length);
+ struct device *dev = acpi_desc->dev;
+ struct nfit_dcr *nfit_dcr;
+
+ list_for_each_entry(nfit_dcr, &prev->dcrs, list)
+ if (memcmp(nfit_dcr->dcr, dcr, length) == 0) {
+ list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);
+ return true;
+ }
+
+ nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);
+ if (!nfit_dcr)
+ return false;
+ INIT_LIST_HEAD(&nfit_dcr->list);
+ nfit_dcr->dcr = dcr;
+ list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs);
+ dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__,
+ 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)
+{
+ size_t length = min_t(size_t, sizeof(*bdw), bdw->header.length);
+ struct device *dev = acpi_desc->dev;
+ struct nfit_bdw *nfit_bdw;
+
+ list_for_each_entry(nfit_bdw, &prev->bdws, list)
+ if (memcmp(nfit_bdw->bdw, bdw, length) == 0) {
+ list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);
+ return true;
+ }
+
+ nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);
+ if (!nfit_bdw)
+ return false;
+ INIT_LIST_HEAD(&nfit_bdw->list);
+ nfit_bdw->bdw = bdw;
+ list_add_tail(&nfit_bdw->list, &acpi_desc->bdws);
+ dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__,
+ bdw->region_index, bdw->windows);
+ return true;
+}
+
+static bool add_idt(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_table_prev *prev,
+ struct acpi_nfit_interleave *idt)
+{
+ size_t length = min_t(size_t, sizeof(*idt), idt->header.length);
+ struct device *dev = acpi_desc->dev;
+ struct nfit_idt *nfit_idt;
+
+ list_for_each_entry(nfit_idt, &prev->idts, list)
+ if (memcmp(nfit_idt->idt, idt, length) == 0) {
+ list_move_tail(&nfit_idt->list, &acpi_desc->idts);
+ return true;
+ }
+
+ nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);
+ if (!nfit_idt)
+ return false;
+ INIT_LIST_HEAD(&nfit_idt->list);
+ nfit_idt->idt = idt;
+ list_add_tail(&nfit_idt->list, &acpi_desc->idts);
+ dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
+ idt->interleave_index, idt->line_count);
+ return true;
+}
+
+static bool add_flush(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_table_prev *prev,
+ struct acpi_nfit_flush_address *flush)
+{
+ size_t length = min_t(size_t, sizeof(*flush), flush->header.length);
+ struct device *dev = acpi_desc->dev;
+ struct nfit_flush *nfit_flush;
+
+ list_for_each_entry(nfit_flush, &prev->flushes, list)
+ if (memcmp(nfit_flush->flush, flush, length) == 0) {
+ list_move_tail(&nfit_flush->list, &acpi_desc->flushes);
+ return true;
+ }
+
+ nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);
+ if (!nfit_flush)
+ return false;
+ INIT_LIST_HEAD(&nfit_flush->list);
+ nfit_flush->flush = flush;
+ list_add_tail(&nfit_flush->list, &acpi_desc->flushes);
+ dev_dbg(dev, "%s: nfit_flush handle: %d hint_count: %d\n", __func__,
+ flush->device_handle, flush->hint_count);
+ 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, "%s: smbios\n", __func__);
+ break;
+ default:
+ dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type);
+ break;
+ }
+
+ return table + hdr->length;
+}
+
+static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem)
+{
+ u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
+ u16 dcr = nfit_mem->dcr->region_index;
+ struct nfit_spa *nfit_spa;
+
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ u16 range_index = nfit_spa->spa->range_index;
+ int type = nfit_spa_type(nfit_spa->spa);
+ struct nfit_memdev *nfit_memdev;
+
+ if (type != NFIT_SPA_BDW)
+ continue;
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ if (nfit_memdev->memdev->range_index != range_index)
+ continue;
+ if (nfit_memdev->memdev->device_handle != device_handle)
+ continue;
+ if (nfit_memdev->memdev->region_index != dcr)
+ continue;
+
+ nfit_mem->spa_bdw = nfit_spa->spa;
+ return;
+ }
+ }
+
+ dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n",
+ nfit_mem->spa_dcr->range_index);
+ nfit_mem->bdw = NULL;
+}
+
+static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
+{
+ u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
+ struct nfit_memdev *nfit_memdev;
+ struct nfit_flush *nfit_flush;
+ struct nfit_bdw *nfit_bdw;
+ struct nfit_idt *nfit_idt;
+ u16 idt_idx, range_index;
+
+ list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
+ if (nfit_bdw->bdw->region_index != dcr)
+ continue;
+ nfit_mem->bdw = nfit_bdw->bdw;
+ break;
+ }
+
+ if (!nfit_mem->bdw)
+ return;
+
+ nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
+
+ if (!nfit_mem->spa_bdw)
+ return;
+
+ range_index = nfit_mem->spa_bdw->range_index;
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ if (nfit_memdev->memdev->range_index != range_index ||
+ nfit_memdev->memdev->region_index != dcr)
+ continue;
+ nfit_mem->memdev_bdw = 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_bdw = nfit_idt->idt;
+ break;
+ }
+
+ list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) {
+ if (nfit_flush->flush->device_handle !=
+ nfit_memdev->memdev->device_handle)
+ continue;
+ nfit_mem->nfit_flush = nfit_flush;
+ break;
+ }
+ break;
+ }
+}
+
+static int nfit_mem_dcr_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 = nfit_spa_type(spa);
+
+ switch (type) {
+ case NFIT_SPA_DCR:
+ case NFIT_SPA_PM:
+ break;
+ default:
+ return 0;
+ }
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ struct nfit_dcr *nfit_dcr;
+ u32 device_handle;
+ u16 dcr;
+
+ if (nfit_memdev->memdev->range_index != spa->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);
+ 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;
+ }
+
+ 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;
+ }
+ nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
+ } else {
+ /*
+ * 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;
+ }
+ }
+
+ return 0;
+}
+
+static int nfit_mem_cmp(void *priv, struct list_head *_a, 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;
+
+ /*
+ * 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) {
+ int rc;
+
+ rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa);
+ if (rc)
+ return rc;
+ }
+
+ list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp);
+
+ return 0;
+}
+
+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 struct attribute *acpi_nfit_attributes[] = {
+ &dev_attr_revision.attr,
+ NULL,
+};
+
+static struct attribute_group acpi_nfit_attribute_group = {
+ .name = "nfit",
+ .attrs = acpi_nfit_attributes,
+};
+
+const struct attribute_group *acpi_nfit_attribute_groups[] = {
+ &nvdimm_bus_attribute_group,
+ &acpi_nfit_attribute_group,
+ NULL,
+};
+EXPORT_SYMBOL_GPL(acpi_nfit_attribute_groups);
+
+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, "%#x\n", 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, "%#x\n", 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, "%#x\n", dcr->device_id);
+}
+static DEVICE_ATTR_RO(device);
+
+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, "%#x\n", dcr->code);
+}
+static DEVICE_ATTR_RO(format);
+
+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, "%#x\n", dcr->serial_number);
+}
+static DEVICE_ATTR_RO(serial);
+
+static ssize_t flags_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u16 flags = to_nfit_memdev(dev)->flags;
+
+ return sprintf(buf, "%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 " : "");
+}
+static DEVICE_ATTR_RO(flags);
+
+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_format.attr,
+ &dev_attr_serial.attr,
+ &dev_attr_rev_id.attr,
+ &dev_attr_flags.attr,
+ NULL,
+};
+
+static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+
+ if (to_nfit_dcr(dev))
+ return a->mode;
+ else
+ return 0;
+}
+
+static 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[] = {
+ &nvdimm_attribute_group,
+ &nd_device_attribute_group,
+ &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;
+}
+
+static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_mem *nfit_mem, u32 device_handle)
+{
+ struct acpi_device *adev, *adev_dimm;
+ struct device *dev = acpi_desc->dev;
+ const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM);
+ int i;
+
+ nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en;
+ adev = to_acpi_dev(acpi_desc);
+ if (!adev)
+ 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;
+ }
+
+ for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++)
+ if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i))
+ set_bit(i, &nfit_mem->dsm_mask);
+
+ return 0;
+}
+
+static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nfit_mem *nfit_mem;
+ int dimm_count = 0;
+
+ list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {
+ struct nvdimm *nvdimm;
+ unsigned long flags = 0;
+ u32 device_handle;
+ u16 mem_flags;
+ int rc;
+
+ device_handle = __to_nfit_memdev(nfit_mem)->device_handle;
+ nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);
+ if (nvdimm) {
+ dimm_count++;
+ continue;
+ }
+
+ if (nfit_mem->bdw && nfit_mem->memdev_pmem)
+ flags |= NDD_ALIASING;
+
+ mem_flags = __to_nfit_memdev(nfit_mem)->flags;
+ if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
+ flags |= NDD_UNARMED;
+
+ rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
+ if (rc)
+ continue;
+
+ nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,
+ acpi_nfit_dimm_attribute_groups,
+ flags, &nfit_mem->dsm_mask);
+ if (!nvdimm)
+ return -ENOMEM;
+
+ nfit_mem->nvdimm = nvdimm;
+ dimm_count++;
+
+ if ((mem_flags & ACPI_NFIT_MEM_FAILED_MASK) == 0)
+ continue;
+
+ dev_info(acpi_desc->dev, "%s flags:%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" : "");
+
+ }
+
+ return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count);
+}
+
+static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
+ const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS);
+ struct acpi_device *adev;
+ int i;
+
+ nd_desc->dsm_mask = acpi_desc->bus_dsm_force_en;
+ adev = to_acpi_dev(acpi_desc);
+ if (!adev)
+ return;
+
+ for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++)
+ if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i))
+ set_bit(i, &nd_desc->dsm_mask);
+}
+
+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 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[] = {
+ &nd_region_attribute_group,
+ &nd_mapping_attribute_group,
+ &nd_device_attribute_group,
+ &nd_numa_attribute_group,
+ &acpi_nfit_region_attribute_group,
+ NULL,
+};
+
+/* enough info to uniquely specify an interleave set */
+struct nfit_set_info {
+ struct nfit_set_info_map {
+ u64 region_offset;
+ u32 serial_number;
+ u32 pad;
+ } mapping[0];
+};
+
+static size_t sizeof_nfit_set_info(int num_mappings)
+{
+ return sizeof(struct nfit_set_info)
+ + num_mappings * sizeof(struct nfit_set_info_map);
+}
+
+static int cmp_map_compat(const void *m0, const void *m1)
+{
+ const struct nfit_set_info_map *map0 = m0;
+ const struct nfit_set_info_map *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_map *map0 = m0;
+ const struct nfit_set_info_map *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)
+{
+ int i, spa_type = nfit_spa_type(spa);
+ struct device *dev = acpi_desc->dev;
+ struct nd_interleave_set *nd_set;
+ u16 nr = ndr_desc->num_mappings;
+ struct nfit_set_info *info;
+
+ if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
+ /* pass */;
+ else
+ return 0;
+
+ nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
+ if (!nd_set)
+ return -ENOMEM;
+
+ info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ for (i = 0; i < nr; i++) {
+ struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
+ struct nfit_set_info_map *map = &info->mapping[i];
+ struct nvdimm *nvdimm = nd_mapping->nvdimm;
+ struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+ struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
+ spa->range_index, i);
+
+ 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 = nfit_mem->dcr->serial_number;
+ }
+
+ sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
+ cmp_map, NULL);
+ nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
+
+ /* support namespaces created with the wrong sort order */
+ sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
+ cmp_map_compat, NULL);
+ nd_set->altcookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
+
+ ndr_desc->nd_set = nd_set;
+ devm_kfree(dev, info);
+
+ return 0;
+}
+
+static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
+{
+ struct acpi_nfit_interleave *idt = mmio->idt;
+ u32 sub_line_offset, line_index, line_offset;
+ u64 line_no, table_skip_count, table_offset;
+
+ line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
+ table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
+ line_offset = idt->line_offset[line_index]
+ * mmio->line_size;
+ table_offset = table_skip_count * mmio->table_size;
+
+ return mmio->base_offset + line_offset + table_offset + sub_line_offset;
+}
+
+static void wmb_blk(struct nfit_blk *nfit_blk)
+{
+
+ if (nfit_blk->nvdimm_flush) {
+ /*
+ * The first wmb() is needed to 'sfence' all previous writes
+ * such that they are architecturally visible for the platform
+ * buffer flush. Note that we've already arranged for pmem
+ * writes to avoid the cache via arch_memcpy_to_pmem(). The
+ * final wmb() ensures ordering for the NVDIMM flush write.
+ */
+ wmb();
+ writeq(1, nfit_blk->nvdimm_flush);
+ wmb();
+ } else
+ wmb_pmem();
+}
+
+static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
+{
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
+ u64 offset = nfit_blk->stat_offset + mmio->size * bw;
+ const u32 STATUS_MASK = 0x80000037;
+
+ if (mmio->num_lines)
+ offset = to_interleave_offset(offset, mmio);
+
+ return readl(mmio->addr.base + offset) & STATUS_MASK;
+}
+
+static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
+ resource_size_t dpa, unsigned int len, unsigned int write)
+{
+ u64 cmd, offset;
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
+
+ enum {
+ BCW_OFFSET_MASK = (1ULL << 48)-1,
+ BCW_LEN_SHIFT = 48,
+ BCW_LEN_MASK = (1ULL << 8) - 1,
+ BCW_CMD_SHIFT = 56,
+ };
+
+ cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
+ len = len >> L1_CACHE_SHIFT;
+ cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
+ cmd |= ((u64) write) << BCW_CMD_SHIFT;
+
+ offset = nfit_blk->cmd_offset + mmio->size * bw;
+ if (mmio->num_lines)
+ offset = to_interleave_offset(offset, mmio);
+
+ writeq(cmd, mmio->addr.base + offset);
+ wmb_blk(nfit_blk);
+
+ if (nfit_blk->dimm_flags & ND_BLK_DCR_LATCH)
+ readq(mmio->addr.base + offset);
+}
+
+static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
+ resource_size_t dpa, void *iobuf, size_t len, int rw,
+ unsigned int lane)
+{
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
+ unsigned int copied = 0;
+ u64 base_offset;
+ int rc;
+
+ base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
+ + lane * mmio->size;
+ write_blk_ctl(nfit_blk, lane, dpa, len, rw);
+ while (len) {
+ unsigned int c;
+ u64 offset;
+
+ if (mmio->num_lines) {
+ u32 line_offset;
+
+ offset = to_interleave_offset(base_offset + copied,
+ mmio);
+ div_u64_rem(offset, mmio->line_size, &line_offset);
+ c = min_t(size_t, len, mmio->line_size - line_offset);
+ } else {
+ offset = base_offset + nfit_blk->bdw_offset;
+ c = len;
+ }
+
+ if (rw)
+ memcpy_to_pmem(mmio->addr.aperture + offset,
+ iobuf + copied, c);
+ else {
+ if (nfit_blk->dimm_flags & ND_BLK_READ_FLUSH)
+ mmio_flush_range((void __force *)
+ mmio->addr.aperture + offset, c);
+
+ memcpy_from_pmem(iobuf + copied,
+ mmio->addr.aperture + offset, c);
+ }
+
+ copied += c;
+ len -= c;
+ }
+
+ if (rw)
+ wmb_blk(nfit_blk);
+
+ rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
+ return rc;
+}
+
+static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
+ resource_size_t dpa, void *iobuf, u64 len, int rw)
+{
+ struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
+ struct nd_region *nd_region = nfit_blk->nd_region;
+ unsigned int lane, copied = 0;
+ int rc = 0;
+
+ lane = nd_region_acquire_lane(nd_region);
+ while (len) {
+ u64 c = min(len, mmio->size);
+
+ rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
+ iobuf + copied, c, rw, lane);
+ if (rc)
+ break;
+
+ copied += c;
+ len -= c;
+ }
+ nd_region_release_lane(nd_region, lane);
+
+ return rc;
+}
+
+static void nfit_spa_mapping_release(struct kref *kref)
+{
+ struct nfit_spa_mapping *spa_map = to_spa_map(kref);
+ struct acpi_nfit_system_address *spa = spa_map->spa;
+ struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
+
+ WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
+ dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
+ if (spa_map->type == SPA_MAP_APERTURE)
+ memunmap((void __force *)spa_map->addr.aperture);
+ else
+ iounmap(spa_map->addr.base);
+ release_mem_region(spa->address, spa->length);
+ list_del(&spa_map->list);
+ kfree(spa_map);
+}
+
+static struct nfit_spa_mapping *find_spa_mapping(
+ struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nfit_spa_mapping *spa_map;
+
+ WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
+ list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
+ if (spa_map->spa == spa)
+ return spa_map;
+
+ return NULL;
+}
+
+static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nfit_spa_mapping *spa_map;
+
+ mutex_lock(&acpi_desc->spa_map_mutex);
+ spa_map = find_spa_mapping(acpi_desc, spa);
+
+ if (spa_map)
+ kref_put(&spa_map->kref, nfit_spa_mapping_release);
+ mutex_unlock(&acpi_desc->spa_map_mutex);
+}
+
+static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa, enum spa_map_type type)
+{
+ resource_size_t start = spa->address;
+ resource_size_t n = spa->length;
+ struct nfit_spa_mapping *spa_map;
+ struct resource *res;
+
+ WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
+
+ spa_map = find_spa_mapping(acpi_desc, spa);
+ if (spa_map) {
+ kref_get(&spa_map->kref);
+ return spa_map->addr.base;
+ }
+
+ spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
+ if (!spa_map)
+ return NULL;
+
+ INIT_LIST_HEAD(&spa_map->list);
+ spa_map->spa = spa;
+ kref_init(&spa_map->kref);
+ spa_map->acpi_desc = acpi_desc;
+
+ res = request_mem_region(start, n, dev_name(acpi_desc->dev));
+ if (!res)
+ goto err_mem;
+
+ spa_map->type = type;
+ if (type == SPA_MAP_APERTURE)
+ spa_map->addr.aperture = (void __pmem *)memremap(start, n,
+ ARCH_MEMREMAP_PMEM);
+ else
+ spa_map->addr.base = ioremap_nocache(start, n);
+
+
+ if (!spa_map->addr.base)
+ goto err_map;
+
+ list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
+ return spa_map->addr.base;
+
+ err_map:
+ release_mem_region(start, n);
+ err_mem:
+ kfree(spa_map);
+ return NULL;
+}
+
+/**
+ * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
+ * @nvdimm_bus: NFIT-bus that provided the spa table entry
+ * @nfit_spa: spa table to map
+ * @type: aperture or control region
+ *
+ * In the case where block-data-window apertures and
+ * dimm-control-regions are interleaved they will end up sharing a
+ * single request_mem_region() + ioremap() for the address range. In
+ * the style of devm nfit_spa_map() mappings are automatically dropped
+ * when all region devices referencing the same mapping are disabled /
+ * unbound.
+ */
+static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
+ struct acpi_nfit_system_address *spa, enum spa_map_type type)
+{
+ void __iomem *iomem;
+
+ mutex_lock(&acpi_desc->spa_map_mutex);
+ iomem = __nfit_spa_map(acpi_desc, spa, type);
+ mutex_unlock(&acpi_desc->spa_map_mutex);
+
+ return iomem;
+}
+
+static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
+ struct acpi_nfit_interleave *idt, u16 interleave_ways)
+{
+ if (idt) {
+ mmio->num_lines = idt->line_count;
+ mmio->line_size = idt->line_size;
+ if (interleave_ways == 0)
+ return -ENXIO;
+ mmio->table_size = mmio->num_lines * interleave_ways
+ * mmio->line_size;
+ }
+
+ return 0;
+}
+
+static int acpi_nfit_blk_get_flags(struct nvdimm_bus_descriptor *nd_desc,
+ struct nvdimm *nvdimm, struct nfit_blk *nfit_blk)
+{
+ struct nd_cmd_dimm_flags flags;
+ int rc;
+
+ memset(&flags, 0, sizeof(flags));
+ rc = nd_desc->ndctl(nd_desc, nvdimm, ND_CMD_DIMM_FLAGS, &flags,
+ sizeof(flags));
+
+ if (rc >= 0 && flags.status == 0)
+ nfit_blk->dimm_flags = flags.flags;
+ else if (rc == -ENOTTY) {
+ /* fall back to a conservative default */
+ nfit_blk->dimm_flags = ND_BLK_DCR_LATCH | ND_BLK_READ_FLUSH;
+ rc = 0;
+ } else
+ rc = -ENXIO;
+
+ return rc;
+}
+
+static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
+ struct device *dev)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+ struct nd_blk_region *ndbr = to_nd_blk_region(dev);
+ struct nfit_flush *nfit_flush;
+ struct nfit_blk_mmio *mmio;
+ struct nfit_blk *nfit_blk;
+ struct nfit_mem *nfit_mem;
+ struct nvdimm *nvdimm;
+ int rc;
+
+ nvdimm = nd_blk_region_to_dimm(ndbr);
+ nfit_mem = nvdimm_provider_data(nvdimm);
+ if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
+ dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
+ nfit_mem ? "" : " nfit_mem",
+ (nfit_mem && nfit_mem->dcr) ? "" : " dcr",
+ (nfit_mem && nfit_mem->bdw) ? "" : " bdw");
+ return -ENXIO;
+ }
+
+ nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
+ if (!nfit_blk)
+ return -ENOMEM;
+ nd_blk_region_set_provider_data(ndbr, nfit_blk);
+ nfit_blk->nd_region = to_nd_region(dev);
+
+ /* map block aperture memory */
+ nfit_blk->bdw_offset = nfit_mem->bdw->offset;
+ mmio = &nfit_blk->mmio[BDW];
+ mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw,
+ SPA_MAP_APERTURE);
+ if (!mmio->addr.base) {
+ dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
+ nvdimm_name(nvdimm));
+ return -ENOMEM;
+ }
+ mmio->size = nfit_mem->bdw->size;
+ mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
+ mmio->idt = nfit_mem->idt_bdw;
+ mmio->spa = nfit_mem->spa_bdw;
+ rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
+ nfit_mem->memdev_bdw->interleave_ways);
+ if (rc) {
+ dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
+ __func__, nvdimm_name(nvdimm));
+ return rc;
+ }
+
+ /* map block control memory */
+ nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
+ nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
+ mmio = &nfit_blk->mmio[DCR];
+ mmio->addr.base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr,
+ SPA_MAP_CONTROL);
+ if (!mmio->addr.base) {
+ dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
+ nvdimm_name(nvdimm));
+ return -ENOMEM;
+ }
+ mmio->size = nfit_mem->dcr->window_size;
+ mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
+ mmio->idt = nfit_mem->idt_dcr;
+ mmio->spa = nfit_mem->spa_dcr;
+ rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
+ nfit_mem->memdev_dcr->interleave_ways);
+ if (rc) {
+ dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
+ __func__, nvdimm_name(nvdimm));
+ return rc;
+ }
+
+ rc = acpi_nfit_blk_get_flags(nd_desc, nvdimm, nfit_blk);
+ if (rc < 0) {
+ dev_dbg(dev, "%s: %s failed get DIMM flags\n",
+ __func__, nvdimm_name(nvdimm));
+ return rc;
+ }
+
+ nfit_flush = nfit_mem->nfit_flush;
+ if (nfit_flush && nfit_flush->flush->hint_count != 0) {
+ nfit_blk->nvdimm_flush = devm_ioremap_nocache(dev,
+ nfit_flush->flush->hint_address[0], 8);
+ if (!nfit_blk->nvdimm_flush)
+ return -ENOMEM;
+ }
+
+ if (!arch_has_wmb_pmem() && !nfit_blk->nvdimm_flush)
+ dev_warn(dev, "unable to guarantee persistence of writes\n");
+
+ if (mmio->line_size == 0)
+ return 0;
+
+ if ((u32) nfit_blk->cmd_offset % mmio->line_size
+ + 8 > mmio->line_size) {
+ dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
+ return -ENXIO;
+ } else if ((u32) nfit_blk->stat_offset % mmio->line_size
+ + 8 > mmio->line_size) {
+ dev_dbg(dev, "stat_offset crosses interleave boundary\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
+ struct device *dev)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+ struct nd_blk_region *ndbr = to_nd_blk_region(dev);
+ struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
+ int i;
+
+ if (!nfit_blk)
+ return; /* never enabled */
+
+ /* auto-free BLK spa mappings */
+ for (i = 0; i < 2; i++) {
+ struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
+
+ if (mmio->addr.base)
+ nfit_spa_unmap(acpi_desc, mmio->spa);
+ }
+ nd_blk_region_set_provider_data(ndbr, NULL);
+ /* devm will free nfit_blk */
+}
+
+static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
+ struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
+ struct acpi_nfit_memory_map *memdev,
+ struct acpi_nfit_system_address *spa)
+{
+ struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
+ memdev->device_handle);
+ struct nd_blk_region_desc *ndbr_desc;
+ struct nfit_mem *nfit_mem;
+ int blk_valid = 0;
+
+ if (!nvdimm) {
+ dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
+ spa->range_index, memdev->device_handle);
+ return -ENODEV;
+ }
+
+ nd_mapping->nvdimm = nvdimm;
+ switch (nfit_spa_type(spa)) {
+ case NFIT_SPA_PM:
+ case NFIT_SPA_VOLATILE:
+ nd_mapping->start = memdev->address;
+ nd_mapping->size = memdev->region_size;
+ break;
+ case NFIT_SPA_DCR:
+ nfit_mem = nvdimm_provider_data(nvdimm);
+ if (!nfit_mem || !nfit_mem->bdw) {
+ dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n",
+ spa->range_index, nvdimm_name(nvdimm));
+ } else {
+ nd_mapping->size = nfit_mem->bdw->capacity;
+ nd_mapping->start = nfit_mem->bdw->start_address;
+ ndr_desc->num_lanes = nfit_mem->bdw->windows;
+ blk_valid = 1;
+ }
+
+ ndr_desc->nd_mapping = nd_mapping;
+ ndr_desc->num_mappings = blk_valid;
+ ndbr_desc = to_blk_region_desc(ndr_desc);
+ ndbr_desc->enable = acpi_nfit_blk_region_enable;
+ ndbr_desc->disable = acpi_nfit_blk_region_disable;
+ ndbr_desc->do_io = acpi_desc->blk_do_io;
+ if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc))
+ return -ENOMEM;
+ break;
+ }
+
+ return 0;
+}
+
+static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
+ struct nfit_spa *nfit_spa)
+{
+ static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
+ struct acpi_nfit_system_address *spa = nfit_spa->spa;
+ struct nd_blk_region_desc ndbr_desc;
+ struct nd_region_desc *ndr_desc;
+ struct nfit_memdev *nfit_memdev;
+ struct nvdimm_bus *nvdimm_bus;
+ struct resource res;
+ int count = 0, rc;
+
+ if (nfit_spa->is_registered)
+ return 0;
+
+ if (spa->range_index == 0) {
+ dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
+ __func__);
+ return 0;
+ }
+
+ memset(&res, 0, sizeof(res));
+ memset(&nd_mappings, 0, sizeof(nd_mappings));
+ memset(&ndbr_desc, 0, sizeof(ndbr_desc));
+ res.start = spa->address;
+ res.end = res.start + spa->length - 1;
+ ndr_desc = &ndbr_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 = acpi_map_pxm_to_online_node(
+ spa->proximity_domain);
+ else
+ ndr_desc->numa_node = NUMA_NO_NODE;
+
+ list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
+ struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
+ struct nd_mapping *nd_mapping;
+
+ 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;
+ }
+ nd_mapping = &nd_mappings[count++];
+ rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
+ memdev, spa);
+ if (rc)
+ return rc;
+ }
+
+ ndr_desc->nd_mapping = nd_mappings;
+ ndr_desc->num_mappings = count;
+ rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
+ if (rc)
+ return rc;
+
+ nvdimm_bus = acpi_desc->nvdimm_bus;
+ if (nfit_spa_type(spa) == NFIT_SPA_PM) {
+ if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
+ return -ENOMEM;
+ } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
+ if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))
+ return -ENOMEM;
+ }
+
+ nfit_spa->is_registered = 1;
+ return 0;
+}
+
+static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
+{
+ struct nfit_spa *nfit_spa;
+
+ list_for_each_entry(nfit_spa, &acpi_desc->spas, list) {
+ int rc = acpi_nfit_register_region(acpi_desc, nfit_spa);
+
+ if (rc)
+ return rc;
+ }
+ 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;
+}
+
+int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
+{
+ struct device *dev = acpi_desc->dev;
+ struct nfit_table_prev prev;
+ const void *end;
+ u8 *data;
+ int rc;
+
+ 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);
+
+ data = (u8 *) acpi_desc->nfit;
+ end = data + sz;
+ while (!IS_ERR_OR_NULL(data))
+ data = add_table(acpi_desc, &prev, data, end);
+
+ if (IS_ERR(data)) {
+ dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,
+ PTR_ERR(data));
+ rc = PTR_ERR(data);
+ goto out_unlock;
+ }
+
+ rc = acpi_nfit_check_deletions(acpi_desc, &prev);
+ if (rc)
+ goto out_unlock;
+
+ if (nfit_mem_init(acpi_desc) != 0) {
+ rc = -ENOMEM;
+ goto out_unlock;
+ }
+
+ acpi_nfit_init_dsms(acpi_desc);
+
+ 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 struct acpi_nfit_desc *acpi_nfit_desc_init(struct acpi_device *adev)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ struct acpi_nfit_desc *acpi_desc;
+ struct device *dev = &adev->dev;
+
+ acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
+ if (!acpi_desc)
+ return ERR_PTR(-ENOMEM);
+
+ dev_set_drvdata(dev, acpi_desc);
+ acpi_desc->dev = dev;
+ acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;
+ nd_desc = &acpi_desc->nd_desc;
+ nd_desc->provider_name = "ACPI.NFIT";
+ nd_desc->ndctl = acpi_nfit_ctl;
+ nd_desc->attr_groups = acpi_nfit_attribute_groups;
+
+ acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
+ if (!acpi_desc->nvdimm_bus) {
+ devm_kfree(dev, acpi_desc);
+ return ERR_PTR(-ENXIO);
+ }
+
+ INIT_LIST_HEAD(&acpi_desc->spa_maps);
+ 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);
+ mutex_init(&acpi_desc->spa_map_mutex);
+ mutex_init(&acpi_desc->init_mutex);
+
+ return acpi_desc;
+}
+
+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;
+
+ status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);
+ if (ACPI_FAILURE(status)) {
+ /* This is ok, we could have an nvdimm hotplugged later */
+ dev_dbg(dev, "failed to find NFIT at startup\n");
+ return 0;
+ }
+
+ acpi_desc = acpi_nfit_desc_init(adev);
+ if (IS_ERR(acpi_desc)) {
+ dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
+ __func__, PTR_ERR(acpi_desc));
+ return PTR_ERR(acpi_desc);
+ }
+
+ /*
+ * Save the acpi header for later and then skip it,
+ * making nfit point to the first nfit table header.
+ */
+ acpi_desc->acpi_header = *tbl;
+ acpi_desc->nfit = (void *) tbl + sizeof(struct acpi_table_nfit);
+ sz -= sizeof(struct acpi_table_nfit);
+
+ /* 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;
+ /*
+ * Adjust for the acpi_object header of the _FIT
+ */
+ obj = buf.pointer;
+ if (obj->type == ACPI_TYPE_BUFFER) {
+ acpi_desc->nfit =
+ (struct acpi_nfit_header *)obj->buffer.pointer;
+ sz = obj->buffer.length;
+ } else
+ dev_dbg(dev, "%s invalid type %d, ignoring _FIT\n",
+ __func__, (int) obj->type);
+ }
+
+ rc = acpi_nfit_init(acpi_desc, sz);
+ if (rc) {
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return rc;
+ }
+ return 0;
+}
+
+static int acpi_nfit_remove(struct acpi_device *adev)
+{
+ struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
+
+ nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
+ return 0;
+}
+
+static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
+{
+ struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_nfit_header *nfit_saved;
+ union acpi_object *obj;
+ struct device *dev = &adev->dev;
+ acpi_status status;
+ int ret;
+
+ dev_dbg(dev, "%s: event: %d\n", __func__, event);
+
+ if (event != NFIT_NOTIFY_UPDATE)
+ return;
+
+ device_lock(dev);
+ if (!dev->driver) {
+ /* dev->driver may be null if we're being removed */
+ dev_dbg(dev, "%s: no driver found for dev\n", __func__);
+ goto out_unlock;
+ }
+
+ if (!acpi_desc) {
+ acpi_desc = acpi_nfit_desc_init(adev);
+ if (IS_ERR(acpi_desc)) {
+ dev_err(dev, "%s: error initializing acpi_desc: %ld\n",
+ __func__, PTR_ERR(acpi_desc));
+ goto out_unlock;
+ }
+ }
+
+ /* Evaluate _FIT */
+ status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "failed to evaluate _FIT\n");
+ goto out_unlock;
+ }
+
+ nfit_saved = acpi_desc->nfit;
+ obj = buf.pointer;
+ if (obj->type == ACPI_TYPE_BUFFER) {
+ acpi_desc->nfit =
+ (struct acpi_nfit_header *)obj->buffer.pointer;
+ ret = acpi_nfit_init(acpi_desc, obj->buffer.length);
+ if (ret) {
+ /* Merge failed, restore old nfit, and exit */
+ acpi_desc->nfit = nfit_saved;
+ dev_err(dev, "failed to merge updated NFIT\n");
+ }
+ } else {
+ /* Bad _FIT, restore old nfit */
+ dev_err(dev, "Invalid _FIT\n");
+ }
+ kfree(buf.pointer);
+
+ out_unlock:
+ device_unlock(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)
+{
+ BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40);
+ BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56);
+ 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);
+
+ acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]);
+ acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]);
+ acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]);
+ acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]);
+ acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]);
+ acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]);
+ acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]);
+ acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]);
+ acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]);
+ acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]);
+
+ return acpi_bus_register_driver(&acpi_nfit_driver);
+}
+
+static __exit void nfit_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_nfit_driver);
+}
+
+module_init(nfit_init);
+module_exit(nfit_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");