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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * GHES/EDAC Linux driver
- *
- * Copyright (c) 2013 by Mauro Carvalho Chehab
- *
- * Red Hat Inc. https://www.redhat.com
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <acpi/ghes.h>
- #include <linux/edac.h>
- #include <linux/dmi.h>
- #include "edac_module.h"
- #include <ras/ras_event.h>
- #define OTHER_DETAIL_LEN 400
- struct ghes_pvt {
- struct mem_ctl_info *mci;
- /* Buffers for the error handling routine */
- char other_detail[OTHER_DETAIL_LEN];
- char msg[80];
- };
- static refcount_t ghes_refcount = REFCOUNT_INIT(0);
- /*
- * Access to ghes_pvt must be protected by ghes_lock. The spinlock
- * also provides the necessary (implicit) memory barrier for the SMP
- * case to make the pointer visible on another CPU.
- */
- static struct ghes_pvt *ghes_pvt;
- /*
- * This driver's representation of the system hardware, as collected
- * from DMI.
- */
- static struct ghes_hw_desc {
- int num_dimms;
- struct dimm_info *dimms;
- } ghes_hw;
- /* GHES registration mutex */
- static DEFINE_MUTEX(ghes_reg_mutex);
- /*
- * Sync with other, potentially concurrent callers of
- * ghes_edac_report_mem_error(). We don't know what the
- * "inventive" firmware would do.
- */
- static DEFINE_SPINLOCK(ghes_lock);
- /* "ghes_edac.force_load=1" skips the platform check */
- static bool __read_mostly force_load;
- module_param(force_load, bool, 0);
- static bool system_scanned;
- /* Memory Device - Type 17 of SMBIOS spec */
- struct memdev_dmi_entry {
- u8 type;
- u8 length;
- u16 handle;
- u16 phys_mem_array_handle;
- u16 mem_err_info_handle;
- u16 total_width;
- u16 data_width;
- u16 size;
- u8 form_factor;
- u8 device_set;
- u8 device_locator;
- u8 bank_locator;
- u8 memory_type;
- u16 type_detail;
- u16 speed;
- u8 manufacturer;
- u8 serial_number;
- u8 asset_tag;
- u8 part_number;
- u8 attributes;
- u32 extended_size;
- u16 conf_mem_clk_speed;
- } __attribute__((__packed__));
- static struct dimm_info *find_dimm_by_handle(struct mem_ctl_info *mci, u16 handle)
- {
- struct dimm_info *dimm;
- mci_for_each_dimm(mci, dimm) {
- if (dimm->smbios_handle == handle)
- return dimm;
- }
- return NULL;
- }
- static void dimm_setup_label(struct dimm_info *dimm, u16 handle)
- {
- const char *bank = NULL, *device = NULL;
- dmi_memdev_name(handle, &bank, &device);
- /*
- * Set to a NULL string when both bank and device are zero. In this case,
- * the label assigned by default will be preserved.
- */
- snprintf(dimm->label, sizeof(dimm->label), "%s%s%s",
- (bank && *bank) ? bank : "",
- (bank && *bank && device && *device) ? " " : "",
- (device && *device) ? device : "");
- }
- static void assign_dmi_dimm_info(struct dimm_info *dimm, struct memdev_dmi_entry *entry)
- {
- u16 rdr_mask = BIT(7) | BIT(13);
- if (entry->size == 0xffff) {
- pr_info("Can't get DIMM%i size\n", dimm->idx);
- dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */
- } else if (entry->size == 0x7fff) {
- dimm->nr_pages = MiB_TO_PAGES(entry->extended_size);
- } else {
- if (entry->size & BIT(15))
- dimm->nr_pages = MiB_TO_PAGES((entry->size & 0x7fff) << 10);
- else
- dimm->nr_pages = MiB_TO_PAGES(entry->size);
- }
- switch (entry->memory_type) {
- case 0x12:
- if (entry->type_detail & BIT(13))
- dimm->mtype = MEM_RDDR;
- else
- dimm->mtype = MEM_DDR;
- break;
- case 0x13:
- if (entry->type_detail & BIT(13))
- dimm->mtype = MEM_RDDR2;
- else
- dimm->mtype = MEM_DDR2;
- break;
- case 0x14:
- dimm->mtype = MEM_FB_DDR2;
- break;
- case 0x18:
- if (entry->type_detail & BIT(12))
- dimm->mtype = MEM_NVDIMM;
- else if (entry->type_detail & BIT(13))
- dimm->mtype = MEM_RDDR3;
- else
- dimm->mtype = MEM_DDR3;
- break;
- case 0x1a:
- if (entry->type_detail & BIT(12))
- dimm->mtype = MEM_NVDIMM;
- else if (entry->type_detail & BIT(13))
- dimm->mtype = MEM_RDDR4;
- else
- dimm->mtype = MEM_DDR4;
- break;
- default:
- if (entry->type_detail & BIT(6))
- dimm->mtype = MEM_RMBS;
- else if ((entry->type_detail & rdr_mask) == rdr_mask)
- dimm->mtype = MEM_RDR;
- else if (entry->type_detail & BIT(7))
- dimm->mtype = MEM_SDR;
- else if (entry->type_detail & BIT(9))
- dimm->mtype = MEM_EDO;
- else
- dimm->mtype = MEM_UNKNOWN;
- }
- /*
- * Actually, we can only detect if the memory has bits for
- * checksum or not
- */
- if (entry->total_width == entry->data_width)
- dimm->edac_mode = EDAC_NONE;
- else
- dimm->edac_mode = EDAC_SECDED;
- dimm->dtype = DEV_UNKNOWN;
- dimm->grain = 128; /* Likely, worse case */
- dimm_setup_label(dimm, entry->handle);
- if (dimm->nr_pages) {
- edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
- dimm->idx, edac_mem_types[dimm->mtype],
- PAGES_TO_MiB(dimm->nr_pages),
- (dimm->edac_mode != EDAC_NONE) ? "(ECC)" : "");
- edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n",
- entry->memory_type, entry->type_detail,
- entry->total_width, entry->data_width);
- }
- dimm->smbios_handle = entry->handle;
- }
- static void enumerate_dimms(const struct dmi_header *dh, void *arg)
- {
- struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;
- struct ghes_hw_desc *hw = (struct ghes_hw_desc *)arg;
- struct dimm_info *d;
- if (dh->type != DMI_ENTRY_MEM_DEVICE)
- return;
- /* Enlarge the array with additional 16 */
- if (!hw->num_dimms || !(hw->num_dimms % 16)) {
- struct dimm_info *new;
- new = krealloc_array(hw->dimms, hw->num_dimms + 16,
- sizeof(struct dimm_info), GFP_KERNEL);
- if (!new) {
- WARN_ON_ONCE(1);
- return;
- }
- hw->dimms = new;
- }
- d = &hw->dimms[hw->num_dimms];
- d->idx = hw->num_dimms;
- assign_dmi_dimm_info(d, entry);
- hw->num_dimms++;
- }
- static void ghes_scan_system(void)
- {
- if (system_scanned)
- return;
- dmi_walk(enumerate_dimms, &ghes_hw);
- system_scanned = true;
- }
- static int print_mem_error_other_detail(const struct cper_sec_mem_err *mem, char *msg,
- const char *location, unsigned int len)
- {
- u32 n;
- if (!msg)
- return 0;
- n = 0;
- len -= 1;
- n += scnprintf(msg + n, len - n, "APEI location: %s ", location);
- if (!(mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS))
- goto out;
- n += scnprintf(msg + n, len - n, "status(0x%016llx): ", mem->error_status);
- n += scnprintf(msg + n, len - n, "%s ", cper_mem_err_status_str(mem->error_status));
- out:
- msg[n] = '\0';
- return n;
- }
- void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
- {
- struct cper_mem_err_compact cmem;
- struct edac_raw_error_desc *e;
- struct mem_ctl_info *mci;
- struct ghes_pvt *pvt;
- unsigned long flags;
- char *p;
- /*
- * We can do the locking below because GHES defers error processing
- * from NMI to IRQ context. Whenever that changes, we'd at least
- * know.
- */
- if (WARN_ON_ONCE(in_nmi()))
- return;
- spin_lock_irqsave(&ghes_lock, flags);
- pvt = ghes_pvt;
- if (!pvt)
- goto unlock;
- mci = pvt->mci;
- e = &mci->error_desc;
- /* Cleans the error report buffer */
- memset(e, 0, sizeof (*e));
- e->error_count = 1;
- e->grain = 1;
- e->msg = pvt->msg;
- e->other_detail = pvt->other_detail;
- e->top_layer = -1;
- e->mid_layer = -1;
- e->low_layer = -1;
- *pvt->other_detail = '\0';
- *pvt->msg = '\0';
- switch (sev) {
- case GHES_SEV_CORRECTED:
- e->type = HW_EVENT_ERR_CORRECTED;
- break;
- case GHES_SEV_RECOVERABLE:
- e->type = HW_EVENT_ERR_UNCORRECTED;
- break;
- case GHES_SEV_PANIC:
- e->type = HW_EVENT_ERR_FATAL;
- break;
- default:
- case GHES_SEV_NO:
- e->type = HW_EVENT_ERR_INFO;
- }
- edac_dbg(1, "error validation_bits: 0x%08llx\n",
- (long long)mem_err->validation_bits);
- /* Error type, mapped on e->msg */
- if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
- u8 etype = mem_err->error_type;
- p = pvt->msg;
- p += snprintf(p, sizeof(pvt->msg), "%s", cper_mem_err_type_str(etype));
- } else {
- strcpy(pvt->msg, "unknown error");
- }
- /* Error address */
- if (mem_err->validation_bits & CPER_MEM_VALID_PA) {
- e->page_frame_number = PHYS_PFN(mem_err->physical_addr);
- e->offset_in_page = offset_in_page(mem_err->physical_addr);
- }
- /* Error grain */
- if (mem_err->validation_bits & CPER_MEM_VALID_PA_MASK)
- e->grain = ~mem_err->physical_addr_mask + 1;
- /* Memory error location, mapped on e->location */
- p = e->location;
- cper_mem_err_pack(mem_err, &cmem);
- p += cper_mem_err_location(&cmem, p);
- if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
- struct dimm_info *dimm;
- p += cper_dimm_err_location(&cmem, p);
- dimm = find_dimm_by_handle(mci, mem_err->mem_dev_handle);
- if (dimm) {
- e->top_layer = dimm->idx;
- strcpy(e->label, dimm->label);
- }
- }
- if (p > e->location)
- *(p - 1) = '\0';
- if (!*e->label)
- strcpy(e->label, "unknown memory");
- /* All other fields are mapped on e->other_detail */
- p = pvt->other_detail;
- p += print_mem_error_other_detail(mem_err, p, e->location, OTHER_DETAIL_LEN);
- if (p > pvt->other_detail)
- *(p - 1) = '\0';
- edac_raw_mc_handle_error(e);
- unlock:
- spin_unlock_irqrestore(&ghes_lock, flags);
- }
- /*
- * Known systems that are safe to enable this module.
- */
- static struct acpi_platform_list plat_list[] = {
- {"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
- { } /* End */
- };
- int ghes_edac_register(struct ghes *ghes, struct device *dev)
- {
- bool fake = false;
- struct mem_ctl_info *mci;
- struct ghes_pvt *pvt;
- struct edac_mc_layer layers[1];
- unsigned long flags;
- int idx = -1;
- int rc = 0;
- if (IS_ENABLED(CONFIG_X86)) {
- /* Check if safe to enable on this system */
- idx = acpi_match_platform_list(plat_list);
- if (!force_load && idx < 0)
- return -ENODEV;
- } else {
- force_load = true;
- idx = 0;
- }
- /* finish another registration/unregistration instance first */
- mutex_lock(&ghes_reg_mutex);
- /*
- * We have only one logical memory controller to which all DIMMs belong.
- */
- if (refcount_inc_not_zero(&ghes_refcount))
- goto unlock;
- ghes_scan_system();
- /* Check if we've got a bogus BIOS */
- if (!ghes_hw.num_dimms) {
- fake = true;
- ghes_hw.num_dimms = 1;
- }
- layers[0].type = EDAC_MC_LAYER_ALL_MEM;
- layers[0].size = ghes_hw.num_dimms;
- layers[0].is_virt_csrow = true;
- mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct ghes_pvt));
- if (!mci) {
- pr_info("Can't allocate memory for EDAC data\n");
- rc = -ENOMEM;
- goto unlock;
- }
- pvt = mci->pvt_info;
- pvt->mci = mci;
- mci->pdev = dev;
- mci->mtype_cap = MEM_FLAG_EMPTY;
- mci->edac_ctl_cap = EDAC_FLAG_NONE;
- mci->edac_cap = EDAC_FLAG_NONE;
- mci->mod_name = "ghes_edac.c";
- mci->ctl_name = "ghes_edac";
- mci->dev_name = "ghes";
- if (fake) {
- pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n");
- pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n");
- pr_info("work on such system. Use this driver with caution\n");
- } else if (idx < 0) {
- pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n");
- pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n");
- pr_info("So, the end result of using this driver varies from vendor to vendor.\n");
- pr_info("If you find incorrect reports, please contact your hardware vendor\n");
- pr_info("to correct its BIOS.\n");
- pr_info("This system has %d DIMM sockets.\n", ghes_hw.num_dimms);
- }
- if (!fake) {
- struct dimm_info *src, *dst;
- int i = 0;
- mci_for_each_dimm(mci, dst) {
- src = &ghes_hw.dimms[i];
- dst->idx = src->idx;
- dst->smbios_handle = src->smbios_handle;
- dst->nr_pages = src->nr_pages;
- dst->mtype = src->mtype;
- dst->edac_mode = src->edac_mode;
- dst->dtype = src->dtype;
- dst->grain = src->grain;
- /*
- * If no src->label, preserve default label assigned
- * from EDAC core.
- */
- if (strlen(src->label))
- memcpy(dst->label, src->label, sizeof(src->label));
- i++;
- }
- } else {
- struct dimm_info *dimm = edac_get_dimm(mci, 0, 0, 0);
- dimm->nr_pages = 1;
- dimm->grain = 128;
- dimm->mtype = MEM_UNKNOWN;
- dimm->dtype = DEV_UNKNOWN;
- dimm->edac_mode = EDAC_SECDED;
- }
- rc = edac_mc_add_mc(mci);
- if (rc < 0) {
- pr_info("Can't register with the EDAC core\n");
- edac_mc_free(mci);
- rc = -ENODEV;
- goto unlock;
- }
- spin_lock_irqsave(&ghes_lock, flags);
- ghes_pvt = pvt;
- spin_unlock_irqrestore(&ghes_lock, flags);
- /* only set on success */
- refcount_set(&ghes_refcount, 1);
- unlock:
- /* Not needed anymore */
- kfree(ghes_hw.dimms);
- ghes_hw.dimms = NULL;
- mutex_unlock(&ghes_reg_mutex);
- return rc;
- }
- void ghes_edac_unregister(struct ghes *ghes)
- {
- struct mem_ctl_info *mci;
- unsigned long flags;
- if (!force_load)
- return;
- mutex_lock(&ghes_reg_mutex);
- system_scanned = false;
- memset(&ghes_hw, 0, sizeof(struct ghes_hw_desc));
- if (!refcount_dec_and_test(&ghes_refcount))
- goto unlock;
- /*
- * Wait for the irq handler being finished.
- */
- spin_lock_irqsave(&ghes_lock, flags);
- mci = ghes_pvt ? ghes_pvt->mci : NULL;
- ghes_pvt = NULL;
- spin_unlock_irqrestore(&ghes_lock, flags);
- if (!mci)
- goto unlock;
- mci = edac_mc_del_mc(mci->pdev);
- if (mci)
- edac_mc_free(mci);
- unlock:
- mutex_unlock(&ghes_reg_mutex);
- }
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