| /* |
| * 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/delay.h> |
| #include <linux/list.h> |
| #include <linux/acpi.h> |
| #include <linux/sort.h> |
| #include <linux/pmem.h> |
| #include <linux/io.h> |
| #include <linux/nd.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"); |
| |
| static unsigned int scrub_timeout = NFIT_ARS_TIMEOUT; |
| module_param(scrub_timeout, uint, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(scrub_timeout, "Initial scrub timeout in seconds"); |
| |
| /* after three payloads of overflow, it's dead jim */ |
| static unsigned int scrub_overflow_abort = 3; |
| module_param(scrub_overflow_abort, uint, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(scrub_overflow_abort, |
| "Number of times we overflow ARS results before abort"); |
| |
| static bool disable_vendor_specific; |
| module_param(disable_vendor_specific, bool, S_IRUGO); |
| MODULE_PARM_DESC(disable_vendor_specific, |
| "Limit commands to the publicly specified set\n"); |
| |
| static struct workqueue_struct *nfit_wq; |
| |
| struct nfit_table_prev { |
| struct list_head spas; |
| struct list_head memdevs; |
| struct list_head dcrs; |
| struct list_head bdws; |
| struct list_head idts; |
| struct list_head flushes; |
| }; |
| |
| static 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 xlat_status(void *buf, unsigned int cmd) |
| { |
| struct nd_cmd_clear_error *clear_err; |
| struct nd_cmd_ars_status *ars_status; |
| struct nd_cmd_ars_start *ars_start; |
| struct nd_cmd_ars_cap *ars_cap; |
| u16 flags; |
| |
| switch (cmd) { |
| case ND_CMD_ARS_CAP: |
| ars_cap = buf; |
| if ((ars_cap->status & 0xffff) == NFIT_ARS_CAP_NONE) |
| return -ENOTTY; |
| |
| /* Command failed */ |
| if (ars_cap->status & 0xffff) |
| return -EIO; |
| |
| /* No supported scan types for this range */ |
| flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE; |
| if ((ars_cap->status >> 16 & flags) == 0) |
| return -ENOTTY; |
| break; |
| case ND_CMD_ARS_START: |
| ars_start = buf; |
| /* ARS is in progress */ |
| if ((ars_start->status & 0xffff) == NFIT_ARS_START_BUSY) |
| return -EBUSY; |
| |
| /* Command failed */ |
| if (ars_start->status & 0xffff) |
| return -EIO; |
| break; |
| case ND_CMD_ARS_STATUS: |
| ars_status = buf; |
| /* Command failed */ |
| if (ars_status->status & 0xffff) |
| return -EIO; |
| /* Check extended status (Upper two bytes) */ |
| if (ars_status->status == NFIT_ARS_STATUS_DONE) |
| return 0; |
| |
| /* ARS is in progress */ |
| if (ars_status->status == NFIT_ARS_STATUS_BUSY) |
| return -EBUSY; |
| |
| /* No ARS performed for the current boot */ |
| if (ars_status->status == NFIT_ARS_STATUS_NONE) |
| return -EAGAIN; |
| |
| /* |
| * ARS interrupted, either we overflowed or some other |
| * agent wants the scan to stop. If we didn't overflow |
| * then just continue with the returned results. |
| */ |
| if (ars_status->status == NFIT_ARS_STATUS_INTR) { |
| if (ars_status->flags & NFIT_ARS_F_OVERFLOW) |
| return -ENOSPC; |
| return 0; |
| } |
| |
| /* Unknown status */ |
| if (ars_status->status >> 16) |
| return -EIO; |
| break; |
| case ND_CMD_CLEAR_ERROR: |
| clear_err = buf; |
| if (clear_err->status & 0xffff) |
| return -EIO; |
| if (!clear_err->cleared) |
| return -EIO; |
| if (clear_err->length > clear_err->cleared) |
| return clear_err->cleared; |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, |
| struct nvdimm *nvdimm, unsigned int cmd, void *buf, |
| unsigned int buf_len, int *cmd_rc) |
| { |
| struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); |
| union acpi_object in_obj, in_buf, *out_obj; |
| const struct nd_cmd_desc *desc = NULL; |
| struct device *dev = acpi_desc->dev; |
| struct nd_cmd_pkg *call_pkg = NULL; |
| const char *cmd_name, *dimm_name; |
| unsigned long cmd_mask, dsm_mask; |
| acpi_handle handle; |
| unsigned int func; |
| const u8 *uuid; |
| u32 offset; |
| int rc, i; |
| |
| func = cmd; |
| if (cmd == ND_CMD_CALL) { |
| call_pkg = buf; |
| func = call_pkg->nd_command; |
| } |
| |
| if (nvdimm) { |
| struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); |
| struct acpi_device *adev = nfit_mem->adev; |
| |
| if (!adev) |
| return -ENOTTY; |
| if (call_pkg && nfit_mem->family != call_pkg->nd_family) |
| return -ENOTTY; |
| |
| dimm_name = nvdimm_name(nvdimm); |
| cmd_name = nvdimm_cmd_name(cmd); |
| cmd_mask = nvdimm_cmd_mask(nvdimm); |
| dsm_mask = nfit_mem->dsm_mask; |
| desc = nd_cmd_dimm_desc(cmd); |
| uuid = to_nfit_uuid(nfit_mem->family); |
| handle = adev->handle; |
| } else { |
| struct acpi_device *adev = to_acpi_dev(acpi_desc); |
| |
| cmd_name = nvdimm_bus_cmd_name(cmd); |
| cmd_mask = nd_desc->cmd_mask; |
| dsm_mask = cmd_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, &cmd_mask) || !test_bit(func, &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 (call_pkg) { |
| /* skip over package wrapper */ |
| in_buf.buffer.pointer = (void *) &call_pkg->nd_payload; |
| in_buf.buffer.length = call_pkg->nd_size_in; |
| } |
| |
| if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) { |
| dev_dbg(dev, "%s:%s cmd: %d: func: %d input length: %d\n", |
| __func__, dimm_name, cmd, func, |
| in_buf.buffer.length); |
| print_hex_dump_debug("nvdimm in ", DUMP_PREFIX_OFFSET, 4, 4, |
| in_buf.buffer.pointer, |
| min_t(u32, 256, in_buf.buffer.length), true); |
| } |
| |
| out_obj = acpi_evaluate_dsm(handle, uuid, 1, func, &in_obj); |
| if (!out_obj) { |
| dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name, |
| cmd_name); |
| return -EINVAL; |
| } |
| |
| if (call_pkg) { |
| call_pkg->nd_fw_size = out_obj->buffer.length; |
| memcpy(call_pkg->nd_payload + call_pkg->nd_size_in, |
| out_obj->buffer.pointer, |
| min(call_pkg->nd_fw_size, call_pkg->nd_size_out)); |
| |
| ACPI_FREE(out_obj); |
| /* |
| * Need to support FW function w/o known size in advance. |
| * Caller can determine required size based upon nd_fw_size. |
| * If we return an error (like elsewhere) then caller wouldn't |
| * be able to rely upon data returned to make calculation. |
| */ |
| return 0; |
| } |
| |
| 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; |
| if (cmd_rc) |
| *cmd_rc = xlat_status(buf, cmd); |
| } else { |
| dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n", |
| __func__, dimm_name, cmd_name, buf_len, |
| offset); |
| rc = -ENXIO; |
| } |
| } else { |
| rc = 0; |
| if (cmd_rc) |
| *cmd_rc = xlat_status(buf, cmd); |
| } |
| |
| 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_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; |
| } |
| 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_flush *nfit_flush; |
| 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); |
| nfit_mem->acpi_desc = acpi_desc; |
| list_add(&nfit_mem->list, &acpi_desc->dimms); |
| } |
| |
| list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) { |
| if (nfit_dcr->dcr->region_index != dcr) |
| continue; |
| /* |
| * Record the control region for the dimm. For |
| * the ACPI 6.1 case, where there are separate |
| * control regions for the pmem vs blk |
| * interfaces, be sure to record the extended |
| * blk details. |
| */ |
| if (!nfit_mem->dcr) |
| nfit_mem->dcr = nfit_dcr->dcr; |
| else if (nfit_mem->dcr->windows == 0 |
| && nfit_dcr->dcr->windows) |
| nfit_mem->dcr = nfit_dcr->dcr; |
| break; |
| } |
| |
| list_for_each_entry(nfit_flush, &acpi_desc->flushes, list) { |
| if (nfit_flush->flush->device_handle != device_handle) |
| continue; |
| nfit_mem->nfit_flush = nfit_flush; |
| 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, |
| }; |
| |
| static const struct attribute_group *acpi_nfit_attribute_groups[] = { |
| &nvdimm_bus_attribute_group, |
| &acpi_nfit_attribute_group, |
| NULL, |
| }; |
| |
| static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev) |
| { |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); |
| |
| return __to_nfit_memdev(nfit_mem); |
| } |
| |
| static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev) |
| { |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); |
| |
| return nfit_mem->dcr; |
| } |
| |
| static ssize_t handle_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev); |
| |
| return sprintf(buf, "%#x\n", memdev->device_handle); |
| } |
| static DEVICE_ATTR_RO(handle); |
| |
| static ssize_t phys_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev); |
| |
| return sprintf(buf, "%#x\n", memdev->physical_id); |
| } |
| static DEVICE_ATTR_RO(phys_id); |
| |
| static ssize_t vendor_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id)); |
| } |
| static DEVICE_ATTR_RO(vendor); |
| |
| static ssize_t rev_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id)); |
| } |
| static DEVICE_ATTR_RO(rev_id); |
| |
| static ssize_t device_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->device_id)); |
| } |
| static DEVICE_ATTR_RO(device); |
| |
| static ssize_t subsystem_vendor_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id)); |
| } |
| static DEVICE_ATTR_RO(subsystem_vendor); |
| |
| static ssize_t subsystem_rev_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", |
| be16_to_cpu(dcr->subsystem_revision_id)); |
| } |
| static DEVICE_ATTR_RO(subsystem_rev_id); |
| |
| static ssize_t subsystem_device_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id)); |
| } |
| static DEVICE_ATTR_RO(subsystem_device); |
| |
| static int num_nvdimm_formats(struct nvdimm *nvdimm) |
| { |
| struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); |
| int formats = 0; |
| |
| if (nfit_mem->memdev_pmem) |
| formats++; |
| if (nfit_mem->memdev_bdw) |
| formats++; |
| return formats; |
| } |
| |
| static ssize_t format_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->code)); |
| } |
| static DEVICE_ATTR_RO(format); |
| |
| static ssize_t format1_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| u32 handle; |
| ssize_t rc = -ENXIO; |
| struct nfit_mem *nfit_mem; |
| struct nfit_memdev *nfit_memdev; |
| struct acpi_nfit_desc *acpi_desc; |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| nfit_mem = nvdimm_provider_data(nvdimm); |
| acpi_desc = nfit_mem->acpi_desc; |
| handle = to_nfit_memdev(dev)->device_handle; |
| |
| /* assumes DIMMs have at most 2 published interface codes */ |
| mutex_lock(&acpi_desc->init_mutex); |
| list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) { |
| struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev; |
| struct nfit_dcr *nfit_dcr; |
| |
| if (memdev->device_handle != handle) |
| continue; |
| |
| list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) { |
| if (nfit_dcr->dcr->region_index != memdev->region_index) |
| continue; |
| if (nfit_dcr->dcr->code == dcr->code) |
| continue; |
| rc = sprintf(buf, "%#x\n", |
| be16_to_cpu(nfit_dcr->dcr->code)); |
| break; |
| } |
| if (rc != ENXIO) |
| break; |
| } |
| mutex_unlock(&acpi_desc->init_mutex); |
| return rc; |
| } |
| static DEVICE_ATTR_RO(format1); |
| |
| static ssize_t formats_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| |
| return sprintf(buf, "%d\n", num_nvdimm_formats(nvdimm)); |
| } |
| static DEVICE_ATTR_RO(formats); |
| |
| static ssize_t serial_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| return sprintf(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number)); |
| } |
| static DEVICE_ATTR_RO(serial); |
| |
| static ssize_t family_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); |
| |
| if (nfit_mem->family < 0) |
| return -ENXIO; |
| return sprintf(buf, "%d\n", nfit_mem->family); |
| } |
| static DEVICE_ATTR_RO(family); |
| |
| static ssize_t dsm_mask_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); |
| |
| if (nfit_mem->family < 0) |
| return -ENXIO; |
| return sprintf(buf, "%#lx\n", nfit_mem->dsm_mask); |
| } |
| static DEVICE_ATTR_RO(dsm_mask); |
| |
| static ssize_t flags_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| 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 ssize_t id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); |
| |
| if (dcr->valid_fields & ACPI_NFIT_CONTROL_MFG_INFO_VALID) |
| return sprintf(buf, "%04x-%02x-%04x-%08x\n", |
| be16_to_cpu(dcr->vendor_id), |
| dcr->manufacturing_location, |
| be16_to_cpu(dcr->manufacturing_date), |
| be32_to_cpu(dcr->serial_number)); |
| else |
| return sprintf(buf, "%04x-%08x\n", |
| be16_to_cpu(dcr->vendor_id), |
| be32_to_cpu(dcr->serial_number)); |
| } |
| static DEVICE_ATTR_RO(id); |
| |
| static struct attribute *acpi_nfit_dimm_attributes[] = { |
| &dev_attr_handle.attr, |
| &dev_attr_phys_id.attr, |
| &dev_attr_vendor.attr, |
| &dev_attr_device.attr, |
| &dev_attr_rev_id.attr, |
| &dev_attr_subsystem_vendor.attr, |
| &dev_attr_subsystem_device.attr, |
| &dev_attr_subsystem_rev_id.attr, |
| &dev_attr_format.attr, |
| &dev_attr_formats.attr, |
| &dev_attr_format1.attr, |
| &dev_attr_serial.attr, |
| &dev_attr_flags.attr, |
| &dev_attr_id.attr, |
| &dev_attr_family.attr, |
| &dev_attr_dsm_mask.attr, |
| 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); |
| struct nvdimm *nvdimm = to_nvdimm(dev); |
| |
| if (!to_nfit_dcr(dev)) |
| return 0; |
| if (a == &dev_attr_format1.attr && num_nvdimm_formats(nvdimm) <= 1) |
| return 0; |
| return a->mode; |
| } |
| |
| 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; |
| unsigned long dsm_mask; |
| const u8 *uuid; |
| int i; |
| |
| /* nfit test assumes 1:1 relationship between commands and dsms */ |
| nfit_mem->dsm_mask = acpi_desc->dimm_cmd_force_en; |
| nfit_mem->family = NVDIMM_FAMILY_INTEL; |
| 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; |
| } |
| |
| /* |
| * Until standardization materializes we need to consider 4 |
| * different command sets. Note, that checking for function0 (bit0) |
| * tells us if any commands are reachable through this uuid. |
| */ |
| for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_MSFT; i++) |
| if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1)) |
| break; |
| |
| /* limit the supported commands to those that are publicly documented */ |
| nfit_mem->family = i; |
| if (nfit_mem->family == NVDIMM_FAMILY_INTEL) { |
| dsm_mask = 0x3fe; |
| if (disable_vendor_specific) |
| dsm_mask &= ~(1 << ND_CMD_VENDOR); |
| } else if (nfit_mem->family == NVDIMM_FAMILY_HPE1) { |
| dsm_mask = 0x1c3c76; |
| } else if (nfit_mem->family == NVDIMM_FAMILY_HPE2) { |
| dsm_mask = 0x1fe; |
| if (disable_vendor_specific) |
| dsm_mask &= ~(1 << 8); |
| } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT) { |
| dsm_mask = 0xffffffff; |
| } else { |
| dev_err(dev, "unknown dimm command family\n"); |
| nfit_mem->family = -1; |
| return force_enable_dimms ? 0 : -ENODEV; |
| } |
| |
| uuid = to_nfit_uuid(nfit_mem->family); |
| for_each_set_bit(i, &dsm_mask, BITS_PER_LONG) |
| 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) { |
| unsigned long flags = 0, cmd_mask; |
| struct nvdimm *nvdimm; |
| 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; |
| |
| /* |
| * TODO: provide translation for non-NVDIMM_FAMILY_INTEL |
| * devices (i.e. from nd_cmd to acpi_dsm) to standardize the |
| * userspace interface. |
| */ |
| cmd_mask = 1UL << ND_CMD_CALL; |
| if (nfit_mem->family == NVDIMM_FAMILY_INTEL) |
| cmd_mask |= nfit_mem->dsm_mask; |
| |
| nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem, |
| acpi_nfit_dimm_attribute_groups, |
| flags, cmd_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->cmd_mask = acpi_desc->bus_cmd_force_en; |
| adev = to_acpi_dev(acpi_desc); |
| if (!adev) |
| return; |
| |
| for (i = ND_CMD_ARS_CAP; i <= ND_CMD_CLEAR_ERROR; i++) |
| if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i)) |
| set_bit(i, &nd_desc->cmd_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(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)); |
| } |
| |
| /* 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); |
| 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; |
| |
| if (mmio->num_lines) |
| offset = to_interleave_offset(offset, mmio); |
| |
| return readl(mmio->addr.base + offset); |
| } |
| |
| 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 & NFIT_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 & NFIT_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), NULL); |
| |
| 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 = NFIT_BLK_DCR_LATCH | NFIT_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 ars_get_cap(struct acpi_nfit_desc *acpi_desc, |
| struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa) |
| { |
| struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; |
| struct acpi_nfit_system_address *spa = nfit_spa->spa; |
| int cmd_rc, rc; |
| |
| cmd->address = spa->address; |
| cmd->length = spa->length; |
| rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd, |
| sizeof(*cmd), &cmd_rc); |
| if (rc < 0) |
| return rc; |
| return cmd_rc; |
| } |
| |
| static int ars_start(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa) |
| { |
| int rc; |
| int cmd_rc; |
| struct nd_cmd_ars_start ars_start; |
| struct acpi_nfit_system_address *spa = nfit_spa->spa; |
| struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; |
| |
| memset(&ars_start, 0, sizeof(ars_start)); |
| ars_start.address = spa->address; |
| ars_start.length = spa->length; |
| if (nfit_spa_type(spa) == NFIT_SPA_PM) |
| ars_start.type = ND_ARS_PERSISTENT; |
| else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) |
| ars_start.type = ND_ARS_VOLATILE; |
| else |
| return -ENOTTY; |
| |
| rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start, |
| sizeof(ars_start), &cmd_rc); |
| |
| if (rc < 0) |
| return rc; |
| return cmd_rc; |
| } |
| |
| static int ars_continue(struct acpi_nfit_desc *acpi_desc) |
| { |
| int rc, cmd_rc; |
| struct nd_cmd_ars_start ars_start; |
| struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; |
| struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status; |
| |
| memset(&ars_start, 0, sizeof(ars_start)); |
| ars_start.address = ars_status->restart_address; |
| ars_start.length = ars_status->restart_length; |
| ars_start.type = ars_status->type; |
| rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start, |
| sizeof(ars_start), &cmd_rc); |
| if (rc < 0) |
| return rc; |
| return cmd_rc; |
| } |
| |
| static int ars_get_status(struct acpi_nfit_desc *acpi_desc) |
| { |
| struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; |
| struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status; |
| int rc, cmd_rc; |
| |
| rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, ars_status, |
| acpi_desc->ars_status_size, &cmd_rc); |
| if (rc < 0) |
| return rc; |
| return cmd_rc; |
| } |
| |
| static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus, |
| struct nd_cmd_ars_status *ars_status) |
| { |
| int rc; |
| u32 i; |
| |
| for (i = 0; i < ars_status->num_records; i++) { |
| rc = nvdimm_bus_add_poison(nvdimm_bus, |
| ars_status->records[i].err_address, |
| ars_status->records[i].length); |
| if (rc) |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static void acpi_nfit_remove_resource(void *data) |
| { |
| struct resource *res = data; |
| |
| remove_resource(res); |
| } |
| |
| static int acpi_nfit_insert_resource(struct acpi_nfit_desc *acpi_desc, |
| struct nd_region_desc *ndr_desc) |
| { |
| struct resource *res, *nd_res = ndr_desc->res; |
| int is_pmem, ret; |
| |
| /* No operation if the region is already registered as PMEM */ |
| is_pmem = region_intersects(nd_res->start, resource_size(nd_res), |
| IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY); |
| if (is_pmem == REGION_INTERSECTS) |
| return 0; |
| |
| res = devm_kzalloc(acpi_desc->dev, sizeof(*res), GFP_KERNEL); |
| if (!res) |
| return -ENOMEM; |
| |
| res->name = "Persistent Memory"; |
| res->start = nd_res->start; |
| res->end = nd_res->end; |
| res->flags = IORESOURCE_MEM; |
| res->desc = IORES_DESC_PERSISTENT_MEMORY; |
| |
| ret = insert_resource(&iomem_resource, res); |
| if (ret) |
| return ret; |
| |
| ret = devm_add_action_or_reset(acpi_desc->dev, |
| acpi_nfit_remove_resource, |
| res); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc, |
| struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc, |
| struct acpi_nfit_memory_map *memdev, |
| struct nfit_spa *nfit_spa) |
| { |
| struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, |
| memdev->device_handle); |
| struct acpi_nfit_system_address *spa = nfit_spa->spa; |
| 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; |
| nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus, |
| ndr_desc); |
| if (!nfit_spa->nd_region) |
| 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->nd_region) |
| 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, nfit_spa); |
| if (rc) |
| goto out; |
| } |
| |
| ndr_desc->nd_mapping = nd_mappings; |
| ndr_desc->num_mappings = count; |
| rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa); |
| if (rc) |
| goto out; |
| |
| nvdimm_bus = acpi_desc->nvdimm_bus; |
| if (nfit_spa_type(spa) == NFIT_SPA_PM) { |
| rc = acpi_nfit_insert_resource(acpi_desc, ndr_desc); |
| if (rc) { |
| dev_warn(acpi_desc->dev, |
| "failed to insert pmem resource to iomem: %d\n", |
| rc); |
| goto out; |
| } |
| |
| nfit_spa->nd_region = nvdimm_pmem_region_create(nvdimm_bus, |
| ndr_desc); |
| if (!nfit_spa->nd_region) |
| rc = -ENOMEM; |
| } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) { |
| nfit_spa->nd_region = nvdimm_volatile_region_create(nvdimm_bus, |
| ndr_desc); |
| if (!nfit_spa->nd_region) |
| rc = -ENOMEM; |
| } |
| |
| out: |
| if (rc) |
| dev_err(acpi_desc->dev, "failed to register spa range %d\n", |
| nfit_spa->spa->range_index); |
| return rc; |
| } |
| |
| static int ars_status_alloc(struct acpi_nfit_desc *acpi_desc, |
| u32 max_ars) |
| { |
| struct device *dev = acpi_desc->dev; |
| struct nd_cmd_ars_status *ars_status; |
| |
| if (acpi_desc->ars_status && acpi_desc->ars_status_size >= max_ars) { |
| memset(acpi_desc->ars_status, 0, acpi_desc->ars_status_size); |
| return 0; |
| } |
| |
| if (acpi_desc->ars_status) |
| devm_kfree(dev, acpi_desc->ars_status); |
| acpi_desc->ars_status = NULL; |
| ars_status = devm_kzalloc(dev, max_ars, GFP_KERNEL); |
| if (!ars_status) |
| return -ENOMEM; |
| acpi_desc->ars_status = ars_status; |
| acpi_desc->ars_status_size = max_ars; |
| return 0; |
| } |
| |
| static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc, |
| struct nfit_spa *nfit_spa) |
| { |
| struct acpi_nfit_system_address *spa = nfit_spa->spa; |
| int rc; |
| |
| if (!nfit_spa->max_ars) { |
| struct nd_cmd_ars_cap ars_cap; |
| |
| memset(&ars_cap, 0, sizeof(ars_cap)); |
| rc = ars_get_cap(acpi_desc, &ars_cap, nfit_spa); |
| if (rc < 0) |
| return rc; |
| nfit_spa->max_ars = ars_cap.max_ars_out; |
| nfit_spa->clear_err_unit = ars_cap.clear_err_unit; |
| /* check that the supported scrub types match the spa type */ |
| if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE && |
| ((ars_cap.status >> 16) & ND_ARS_VOLATILE) == 0) |
| return -ENOTTY; |
| else if (nfit_spa_type(spa) == NFIT_SPA_PM && |
| ((ars_cap.status >> 16) & ND_ARS_PERSISTENT) == 0) |
| return -ENOTTY; |
| } |
| |
| if (ars_status_alloc(acpi_desc, nfit_spa->max_ars)) |
| return -ENOMEM; |
| |
| rc = ars_get_status(acpi_desc); |
| if (rc < 0 && rc != -ENOSPC) |
| return rc; |
| |
| if (ars_status_process_records(acpi_desc->nvdimm_bus, |
| acpi_desc->ars_status)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc, |
| struct nfit_spa *nfit_spa) |
| { |
| struct acpi_nfit_system_address *spa = nfit_spa->spa; |
| unsigned int overflow_retry = scrub_overflow_abort; |
| u64 init_ars_start = 0, init_ars_len = 0; |
| struct device *dev = acpi_desc->dev; |
| unsigned int tmo = scrub_timeout; |
| int rc; |
| |
| if (nfit_spa->ars_done || !nfit_spa->nd_region) |
| return; |
| |
| rc = ars_start(acpi_desc, nfit_spa); |
| /* |
| * If we timed out the initial scan we'll still be busy here, |
| * and will wait another timeout before giving up permanently. |
| */ |
| if (rc < 0 && rc != -EBUSY) |
| return; |
| |
| do { |
| u64 ars_start, ars_len; |
| |
| if (acpi_desc->cancel) |
| break; |
| rc = acpi_nfit_query_poison(acpi_desc, nfit_spa); |
| if (rc == -ENOTTY) |
| break; |
| if (rc == -EBUSY && !tmo) { |
| dev_warn(dev, "range %d ars timeout, aborting\n", |
| spa->range_index); |
| break; |
| } |
| |
| if (rc == -EBUSY) { |
| /* |
| * Note, entries may be appended to the list |
| * while the lock is dropped, but the workqueue |
| * being active prevents entries being deleted / |
| * freed. |
| */ |
| mutex_unlock(&acpi_desc->init_mutex); |
| ssleep(1); |
| tmo--; |
| mutex_lock(&acpi_desc->init_mutex); |
| continue; |
| } |
| |
| /* we got some results, but there are more pending... */ |
| if (rc == -ENOSPC && overflow_retry--) { |
| if (!init_ars_len) { |
| init_ars_len = acpi_desc->ars_status->length; |
| init_ars_start = acpi_desc->ars_status->address; |
| } |
| rc = ars_continue(acpi_desc); |
| } |
| |
| if (rc < 0) { |
| dev_warn(dev, "range %d ars continuation failed\n", |
| spa->range_index); |
| break; |
| } |
| |
| if (init_ars_len) { |
| ars_start = init_ars_start; |
| ars_len = init_ars_len; |
| } else { |
| ars_start = acpi_desc->ars_status->address; |
| ars_len = acpi_desc->ars_status->length; |
| } |
| dev_dbg(dev, "spa range: %d ars from %#llx + %#llx complete\n", |
| spa->range_index, ars_start, ars_len); |
| /* notify the region about new poison entries */ |
| nvdimm_region_notify(nfit_spa->nd_region, |
| NVDIMM_REVALIDATE_POISON); |
| break; |
| } while (1); |
| } |
| |
| static void acpi_nfit_scrub(struct work_struct *work) |
| { |
| struct device *dev; |
| u64 init_scrub_length = 0; |
| struct nfit_spa *nfit_spa; |
| u64 init_scrub_address = 0; |
| bool init_ars_done = false; |
| struct acpi_nfit_desc *acpi_desc; |
| unsigned int tmo = scrub_timeout; |
| unsigned int overflow_retry = scrub_overflow_abort; |
| |
| acpi_desc = container_of(work, typeof(*acpi_desc), work); |
| dev = acpi_desc->dev; |
| |
| /* |
| * We scrub in 2 phases. The first phase waits for any platform |
| * firmware initiated scrubs to complete and then we go search for the |
| * affected spa regions to mark them scanned. In the second phase we |
| * initiate a directed scrub for every range that was not scrubbed in |
| * phase 1. |
| */ |
| |
| /* process platform firmware initiated scrubs */ |
| retry: |
| mutex_lock(&acpi_desc->init_mutex); |
| list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { |
| struct nd_cmd_ars_status *ars_status; |
| struct acpi_nfit_system_address *spa; |
| u64 ars_start, ars_len; |
| int rc; |
| |
| if (acpi_desc->cancel) |
| break; |
| |
| if (nfit_spa->nd_region) |
| continue; |
| |
| if (init_ars_done) { |
| /* |
| * No need to re-query, we're now just |
| * reconciling all the ranges covered by the |
| * initial scrub |
| */ |
| rc = 0; |
| } else |
| rc = acpi_nfit_query_poison(acpi_desc, nfit_spa); |
| |
| if (rc == -ENOTTY) { |
| /* no ars capability, just register spa and move on */ |
| acpi_nfit_register_region(acpi_desc, nfit_spa); |
| continue; |
| } |
| |
| if (rc == -EBUSY && !tmo) { |
| /* fallthrough to directed scrub in phase 2 */ |
| dev_warn(dev, "timeout awaiting ars results, continuing...\n"); |
| break; |
| } else if (rc == -EBUSY) { |
| mutex_unlock(&acpi_desc->init_mutex); |
| ssleep(1); |
| tmo--; |
| goto retry; |
| } |
| |
| /* we got some results, but there are more pending... */ |
| if (rc == -ENOSPC && overflow_retry--) { |
| ars_status = acpi_desc->ars_status; |
| /* |
| * Record the original scrub range, so that we |
| * can recall all the ranges impacted by the |
| * initial scrub. |
| */ |
| if (!init_scrub_length) { |
| init_scrub_length = ars_status->length; |
| init_scrub_address = ars_status->address; |
| } |
| rc = ars_continue(acpi_desc); |
| if (rc == 0) { |
| mutex_unlock(&acpi_desc->init_mutex); |
| goto retry; |
| } |
| } |
| |
| if (rc < 0) { |
| /* |
| * Initial scrub failed, we'll give it one more |
| * try below... |
| */ |
| break; |
| } |
| |
| /* We got some final results, record completed ranges */ |
| ars_status = acpi_desc->ars_status; |
| if (init_scrub_length) { |
| ars_start = init_scrub_address; |
| ars_len = ars_start + init_scrub_length; |
| } else { |
| ars_start = ars_status->address; |
| ars_len = ars_status->length; |
| } |
| spa = nfit_spa->spa; |
| |
| if (!init_ars_done) { |
| init_ars_done = true; |
| dev_dbg(dev, "init scrub %#llx + %#llx complete\n", |
| ars_start, ars_len); |
| } |
| if (ars_start <= spa->address && ars_start + ars_len |
| >= spa->address + spa->length) |
| acpi_nfit_register_region(acpi_desc, nfit_spa); |
| } |
| |
| /* |
| * For all the ranges not covered by an initial scrub we still |
| * want to see if there are errors, but it's ok to discover them |
| * asynchronously. |
| */ |
| list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { |
| /* |
| * Flag all the ranges that still need scrubbing, but |
| * register them now to make data available. |
| */ |
| if (nfit_spa->nd_region) |
| nfit_spa->ars_done = 1; |
| else |
| acpi_nfit_register_region(acpi_desc, nfit_spa); |
| } |
| |
| list_for_each_entry(nfit_spa, &acpi_desc->spas, list) |
| acpi_nfit_async_scrub(acpi_desc, nfit_spa); |
| mutex_unlock(&acpi_desc->init_mutex); |
| } |
| |
| static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc) |
| { |
| struct nfit_spa *nfit_spa; |
| int rc; |
| |
| list_for_each_entry(nfit_spa, &acpi_desc->spas, list) |
| if (nfit_spa_type(nfit_spa->spa) == NFIT_SPA_DCR) { |
| /* BLK regions don't need to wait for ars results */ |
| rc = acpi_nfit_register_region(acpi_desc, nfit_spa); |
| if (rc) |
| return rc; |
| } |
| |
| queue_work(nfit_wq, &acpi_desc->work); |
| 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; |
| |
| rc = nfit_mem_init(acpi_desc); |
| if (rc) |
| 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); |
| |
| struct acpi_nfit_flush_work { |
| struct work_struct work; |
| struct completion cmp; |
| }; |
| |
| static void flush_probe(struct work_struct *work) |
| { |
| struct acpi_nfit_flush_work *flush; |
| |
| flush = container_of(work, typeof(*flush), work); |
| complete(&flush->cmp); |
| } |
| |
| static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc) |
| { |
| struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); |
| struct device *dev = acpi_desc->dev; |
| struct acpi_nfit_flush_work flush; |
| |
| /* bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */ |
| device_lock(dev); |
| device_unlock(dev); |
| |
| /* |
| * Scrub work could take 10s of seconds, userspace may give up so we |
| * need to be interruptible while waiting. |
| */ |
| INIT_WORK_ONSTACK(&flush.work, flush_probe); |
| COMPLETION_INITIALIZER_ONSTACK(flush.cmp); |
| queue_work(nfit_wq, &flush.work); |
| return wait_for_completion_interruptible(&flush.cmp); |
| } |
| |
| static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc, |
| struct nvdimm *nvdimm, unsigned int cmd) |
| { |
| struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); |
| |
| if (nvdimm) |
| return 0; |
| if (cmd != ND_CMD_ARS_START) |
| return 0; |
| |
| /* |
| * The kernel and userspace may race to initiate a scrub, but |
| * the scrub thread is prepared to lose that initial race. It |
| * just needs guarantees that any ars it initiates are not |
| * interrupted by any intervening start reqeusts from userspace. |
| */ |
| if (work_busy(&acpi_desc->work)) |
| return -EBUSY; |
| |
| return 0; |
| } |
| |
| void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) |
| { |
| struct nvdimm_bus_descriptor *nd_desc; |
| |
| dev_set_drvdata(dev, acpi_desc); |
| acpi_desc->dev = dev; |
| 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->flush_probe = acpi_nfit_flush_probe; |
| nd_desc->clear_to_send = acpi_nfit_clear_to_send; |
| nd_desc->attr_groups = acpi_nfit_attribute_groups; |
| |
| INIT_LIST_HEAD(&acpi_desc->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); |
| INIT_WORK(&acpi_desc->work, acpi_nfit_scrub); |
| } |
| EXPORT_SYMBOL_GPL(acpi_nfit_desc_init); |
| |
| 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(ACPI_SIG_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 = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL); |
| if (!acpi_desc) |
| return -ENOMEM; |
| acpi_nfit_desc_init(acpi_desc, &adev->dev); |
| acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc); |
| if (!acpi_desc->nvdimm_bus) |
| return -ENOMEM; |
| |
| /* |
| * 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); |
| |
| acpi_desc->cancel = 1; |
| flush_workqueue(nfit_wq); |
| 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); |
| |
| 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 = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL); |
| if (!acpi_desc) |
| goto out_unlock; |
| acpi_nfit_desc_init(acpi_desc, &adev->dev); |
| acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, &acpi_desc->nd_desc); |
| if (!acpi_desc->nvdimm_bus) |
| goto out_unlock; |
| } else { |
| /* |
| * Finish previous registration before considering new |
| * regions. |
| */ |
| flush_workqueue(nfit_wq); |
| } |
| |
| /* 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]); |
| acpi_str_to_uuid(UUID_NFIT_DIMM_N_HPE1, nfit_uuid[NFIT_DEV_DIMM_N_HPE1]); |
| acpi_str_to_uuid(UUID_NFIT_DIMM_N_HPE2, nfit_uuid[NFIT_DEV_DIMM_N_HPE2]); |
| acpi_str_to_uuid(UUID_NFIT_DIMM_N_MSFT, nfit_uuid[NFIT_DEV_DIMM_N_MSFT]); |
| |
| nfit_wq = create_singlethread_workqueue("nfit"); |
| if (!nfit_wq) |
| return -ENOMEM; |
| |
| return acpi_bus_register_driver(&acpi_nfit_driver); |
| } |
| |
| static __exit void nfit_exit(void) |
| { |
| acpi_bus_unregister_driver(&acpi_nfit_driver); |
| destroy_workqueue(nfit_wq); |
| } |
| |
| module_init(nfit_init); |
| module_exit(nfit_exit); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Intel Corporation"); |