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- /*
- * 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");
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