526 lines
13 KiB
C
526 lines
13 KiB
C
/*
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* GHES/EDAC Linux driver
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*
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* This file may be distributed under the terms of the GNU General Public
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* License version 2.
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*
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* Copyright (c) 2013 by Mauro Carvalho Chehab
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*
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* Red Hat Inc. http://www.redhat.com
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <acpi/ghes.h>
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#include <linux/edac.h>
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#include <linux/dmi.h>
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#include "edac_module.h"
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#include <ras/ras_event.h>
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struct ghes_edac_pvt {
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struct list_head list;
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struct ghes *ghes;
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struct mem_ctl_info *mci;
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/* Buffers for the error handling routine */
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char detail_location[240];
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char other_detail[160];
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char msg[80];
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};
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static atomic_t ghes_init = ATOMIC_INIT(0);
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static struct ghes_edac_pvt *ghes_pvt;
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/*
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* Sync with other, potentially concurrent callers of
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* ghes_edac_report_mem_error(). We don't know what the
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* "inventive" firmware would do.
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*/
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static DEFINE_SPINLOCK(ghes_lock);
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/* "ghes_edac.force_load=1" skips the platform check */
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static bool __read_mostly force_load;
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module_param(force_load, bool, 0);
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/* Memory Device - Type 17 of SMBIOS spec */
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struct memdev_dmi_entry {
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u8 type;
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u8 length;
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u16 handle;
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u16 phys_mem_array_handle;
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u16 mem_err_info_handle;
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u16 total_width;
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u16 data_width;
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u16 size;
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u8 form_factor;
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u8 device_set;
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u8 device_locator;
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u8 bank_locator;
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u8 memory_type;
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u16 type_detail;
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u16 speed;
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u8 manufacturer;
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u8 serial_number;
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u8 asset_tag;
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u8 part_number;
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u8 attributes;
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u32 extended_size;
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u16 conf_mem_clk_speed;
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} __attribute__((__packed__));
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struct ghes_edac_dimm_fill {
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struct mem_ctl_info *mci;
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unsigned count;
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};
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static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)
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{
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int *num_dimm = arg;
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if (dh->type == DMI_ENTRY_MEM_DEVICE)
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(*num_dimm)++;
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}
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static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
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{
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struct ghes_edac_dimm_fill *dimm_fill = arg;
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struct mem_ctl_info *mci = dimm_fill->mci;
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if (dh->type == DMI_ENTRY_MEM_DEVICE) {
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struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;
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struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
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mci->n_layers,
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dimm_fill->count, 0, 0);
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if (entry->size == 0xffff) {
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pr_info("Can't get DIMM%i size\n",
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dimm_fill->count);
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dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */
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} else if (entry->size == 0x7fff) {
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dimm->nr_pages = MiB_TO_PAGES(entry->extended_size);
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} else {
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if (entry->size & 1 << 15)
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dimm->nr_pages = MiB_TO_PAGES((entry->size &
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0x7fff) << 10);
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else
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dimm->nr_pages = MiB_TO_PAGES(entry->size);
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}
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switch (entry->memory_type) {
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case 0x12:
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if (entry->type_detail & 1 << 13)
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dimm->mtype = MEM_RDDR;
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else
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dimm->mtype = MEM_DDR;
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break;
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case 0x13:
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if (entry->type_detail & 1 << 13)
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dimm->mtype = MEM_RDDR2;
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else
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dimm->mtype = MEM_DDR2;
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break;
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case 0x14:
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dimm->mtype = MEM_FB_DDR2;
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break;
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case 0x18:
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if (entry->type_detail & 1 << 13)
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dimm->mtype = MEM_RDDR3;
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else
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dimm->mtype = MEM_DDR3;
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break;
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default:
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if (entry->type_detail & 1 << 6)
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dimm->mtype = MEM_RMBS;
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else if ((entry->type_detail & ((1 << 7) | (1 << 13)))
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== ((1 << 7) | (1 << 13)))
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dimm->mtype = MEM_RDR;
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else if (entry->type_detail & 1 << 7)
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dimm->mtype = MEM_SDR;
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else if (entry->type_detail & 1 << 9)
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dimm->mtype = MEM_EDO;
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else
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dimm->mtype = MEM_UNKNOWN;
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}
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/*
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* Actually, we can only detect if the memory has bits for
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* checksum or not
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*/
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if (entry->total_width == entry->data_width)
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dimm->edac_mode = EDAC_NONE;
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else
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dimm->edac_mode = EDAC_SECDED;
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dimm->dtype = DEV_UNKNOWN;
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dimm->grain = 128; /* Likely, worse case */
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/*
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* FIXME: It shouldn't be hard to also fill the DIMM labels
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*/
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if (dimm->nr_pages) {
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edac_dbg(1, "DIMM%i: %s size = %d MB%s\n",
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dimm_fill->count, edac_mem_types[dimm->mtype],
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PAGES_TO_MiB(dimm->nr_pages),
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(dimm->edac_mode != EDAC_NONE) ? "(ECC)" : "");
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edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n",
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entry->memory_type, entry->type_detail,
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entry->total_width, entry->data_width);
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}
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dimm_fill->count++;
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}
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}
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void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
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struct cper_sec_mem_err *mem_err)
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{
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enum hw_event_mc_err_type type;
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struct edac_raw_error_desc *e;
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struct mem_ctl_info *mci;
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struct ghes_edac_pvt *pvt = ghes_pvt;
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unsigned long flags;
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char *p;
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u8 grain_bits;
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if (!pvt) {
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pr_err("Internal error: Can't find EDAC structure\n");
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return;
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}
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/*
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* We can do the locking below because GHES defers error processing
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* from NMI to IRQ context. Whenever that changes, we'd at least
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* know.
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*/
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if (WARN_ON_ONCE(in_nmi()))
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return;
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spin_lock_irqsave(&ghes_lock, flags);
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mci = pvt->mci;
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e = &mci->error_desc;
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/* Cleans the error report buffer */
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memset(e, 0, sizeof (*e));
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e->error_count = 1;
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strcpy(e->label, "unknown label");
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e->msg = pvt->msg;
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e->other_detail = pvt->other_detail;
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e->top_layer = -1;
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e->mid_layer = -1;
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e->low_layer = -1;
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*pvt->other_detail = '\0';
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*pvt->msg = '\0';
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switch (sev) {
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case GHES_SEV_CORRECTED:
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type = HW_EVENT_ERR_CORRECTED;
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break;
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case GHES_SEV_RECOVERABLE:
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type = HW_EVENT_ERR_UNCORRECTED;
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break;
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case GHES_SEV_PANIC:
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type = HW_EVENT_ERR_FATAL;
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break;
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default:
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case GHES_SEV_NO:
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type = HW_EVENT_ERR_INFO;
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}
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edac_dbg(1, "error validation_bits: 0x%08llx\n",
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(long long)mem_err->validation_bits);
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/* Error type, mapped on e->msg */
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if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
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p = pvt->msg;
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switch (mem_err->error_type) {
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case 0:
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p += sprintf(p, "Unknown");
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break;
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case 1:
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p += sprintf(p, "No error");
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break;
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case 2:
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p += sprintf(p, "Single-bit ECC");
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break;
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case 3:
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p += sprintf(p, "Multi-bit ECC");
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break;
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case 4:
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p += sprintf(p, "Single-symbol ChipKill ECC");
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break;
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case 5:
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p += sprintf(p, "Multi-symbol ChipKill ECC");
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break;
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case 6:
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p += sprintf(p, "Master abort");
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break;
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case 7:
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p += sprintf(p, "Target abort");
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break;
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case 8:
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p += sprintf(p, "Parity Error");
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break;
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case 9:
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p += sprintf(p, "Watchdog timeout");
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break;
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case 10:
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p += sprintf(p, "Invalid address");
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break;
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case 11:
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p += sprintf(p, "Mirror Broken");
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break;
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case 12:
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p += sprintf(p, "Memory Sparing");
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break;
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case 13:
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p += sprintf(p, "Scrub corrected error");
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break;
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case 14:
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p += sprintf(p, "Scrub uncorrected error");
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break;
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case 15:
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p += sprintf(p, "Physical Memory Map-out event");
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break;
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default:
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p += sprintf(p, "reserved error (%d)",
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mem_err->error_type);
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}
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} else {
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strcpy(pvt->msg, "unknown error");
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}
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/* Error address */
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if (mem_err->validation_bits & CPER_MEM_VALID_PA) {
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e->page_frame_number = mem_err->physical_addr >> PAGE_SHIFT;
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e->offset_in_page = mem_err->physical_addr & ~PAGE_MASK;
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}
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/* Error grain */
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if (mem_err->validation_bits & CPER_MEM_VALID_PA_MASK)
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e->grain = ~(mem_err->physical_addr_mask & ~PAGE_MASK);
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/* Memory error location, mapped on e->location */
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p = e->location;
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if (mem_err->validation_bits & CPER_MEM_VALID_NODE)
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p += sprintf(p, "node:%d ", mem_err->node);
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if (mem_err->validation_bits & CPER_MEM_VALID_CARD)
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p += sprintf(p, "card:%d ", mem_err->card);
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if (mem_err->validation_bits & CPER_MEM_VALID_MODULE)
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p += sprintf(p, "module:%d ", mem_err->module);
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if (mem_err->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
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p += sprintf(p, "rank:%d ", mem_err->rank);
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if (mem_err->validation_bits & CPER_MEM_VALID_BANK)
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p += sprintf(p, "bank:%d ", mem_err->bank);
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if (mem_err->validation_bits & CPER_MEM_VALID_ROW)
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p += sprintf(p, "row:%d ", mem_err->row);
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if (mem_err->validation_bits & CPER_MEM_VALID_COLUMN)
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p += sprintf(p, "col:%d ", mem_err->column);
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if (mem_err->validation_bits & CPER_MEM_VALID_BIT_POSITION)
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p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos);
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if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
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const char *bank = NULL, *device = NULL;
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dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device);
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if (bank != NULL && device != NULL)
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p += sprintf(p, "DIMM location:%s %s ", bank, device);
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else
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p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
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mem_err->mem_dev_handle);
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}
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if (p > e->location)
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*(p - 1) = '\0';
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/* All other fields are mapped on e->other_detail */
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p = pvt->other_detail;
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if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_STATUS) {
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u64 status = mem_err->error_status;
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p += sprintf(p, "status(0x%016llx): ", (long long)status);
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switch ((status >> 8) & 0xff) {
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case 1:
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p += sprintf(p, "Error detected internal to the component ");
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break;
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case 16:
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p += sprintf(p, "Error detected in the bus ");
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break;
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case 4:
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p += sprintf(p, "Storage error in DRAM memory ");
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break;
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case 5:
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p += sprintf(p, "Storage error in TLB ");
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break;
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case 6:
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p += sprintf(p, "Storage error in cache ");
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break;
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case 7:
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p += sprintf(p, "Error in one or more functional units ");
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break;
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case 8:
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p += sprintf(p, "component failed self test ");
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break;
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case 9:
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p += sprintf(p, "Overflow or undervalue of internal queue ");
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break;
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case 17:
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p += sprintf(p, "Virtual address not found on IO-TLB or IO-PDIR ");
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break;
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case 18:
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p += sprintf(p, "Improper access error ");
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break;
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case 19:
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p += sprintf(p, "Access to a memory address which is not mapped to any component ");
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break;
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case 20:
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p += sprintf(p, "Loss of Lockstep ");
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break;
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case 21:
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p += sprintf(p, "Response not associated with a request ");
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break;
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case 22:
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p += sprintf(p, "Bus parity error - must also set the A, C, or D Bits ");
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break;
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case 23:
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p += sprintf(p, "Detection of a PATH_ERROR ");
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break;
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case 25:
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p += sprintf(p, "Bus operation timeout ");
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break;
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case 26:
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p += sprintf(p, "A read was issued to data that has been poisoned ");
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break;
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default:
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p += sprintf(p, "reserved ");
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break;
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}
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}
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if (mem_err->validation_bits & CPER_MEM_VALID_REQUESTOR_ID)
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p += sprintf(p, "requestorID: 0x%016llx ",
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(long long)mem_err->requestor_id);
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if (mem_err->validation_bits & CPER_MEM_VALID_RESPONDER_ID)
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p += sprintf(p, "responderID: 0x%016llx ",
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(long long)mem_err->responder_id);
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if (mem_err->validation_bits & CPER_MEM_VALID_TARGET_ID)
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p += sprintf(p, "targetID: 0x%016llx ",
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(long long)mem_err->responder_id);
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if (p > pvt->other_detail)
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*(p - 1) = '\0';
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/* Generate the trace event */
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grain_bits = fls_long(e->grain);
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snprintf(pvt->detail_location, sizeof(pvt->detail_location),
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"APEI location: %s %s", e->location, e->other_detail);
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trace_mc_event(type, e->msg, e->label, e->error_count,
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mci->mc_idx, e->top_layer, e->mid_layer, e->low_layer,
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(e->page_frame_number << PAGE_SHIFT) | e->offset_in_page,
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grain_bits, e->syndrome, pvt->detail_location);
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edac_raw_mc_handle_error(type, mci, e);
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spin_unlock_irqrestore(&ghes_lock, flags);
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}
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/*
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* Known systems that are safe to enable this module.
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*/
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static struct acpi_platform_list plat_list[] = {
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{"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
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{ } /* End */
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};
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int ghes_edac_register(struct ghes *ghes, struct device *dev)
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{
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bool fake = false;
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int rc, num_dimm = 0;
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struct mem_ctl_info *mci;
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struct edac_mc_layer layers[1];
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struct ghes_edac_dimm_fill dimm_fill;
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int idx;
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/* Check if safe to enable on this system */
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idx = acpi_match_platform_list(plat_list);
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if (!force_load && idx < 0)
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return 0;
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/*
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* We have only one logical memory controller to which all DIMMs belong.
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*/
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if (atomic_inc_return(&ghes_init) > 1)
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return 0;
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/* Get the number of DIMMs */
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dmi_walk(ghes_edac_count_dimms, &num_dimm);
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/* Check if we've got a bogus BIOS */
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if (num_dimm == 0) {
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fake = true;
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num_dimm = 1;
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}
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layers[0].type = EDAC_MC_LAYER_ALL_MEM;
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layers[0].size = num_dimm;
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layers[0].is_virt_csrow = true;
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mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct ghes_edac_pvt));
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if (!mci) {
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pr_info("Can't allocate memory for EDAC data\n");
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return -ENOMEM;
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}
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ghes_pvt = mci->pvt_info;
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ghes_pvt->ghes = ghes;
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ghes_pvt->mci = mci;
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mci->pdev = dev;
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mci->mtype_cap = MEM_FLAG_EMPTY;
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mci->edac_ctl_cap = EDAC_FLAG_NONE;
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mci->edac_cap = EDAC_FLAG_NONE;
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mci->mod_name = "ghes_edac.c";
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mci->ctl_name = "ghes_edac";
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mci->dev_name = "ghes";
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if (fake) {
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pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n");
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pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n");
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pr_info("work on such system. Use this driver with caution\n");
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} else if (idx < 0) {
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pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n");
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pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n");
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pr_info("So, the end result of using this driver varies from vendor to vendor.\n");
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pr_info("If you find incorrect reports, please contact your hardware vendor\n");
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pr_info("to correct its BIOS.\n");
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pr_info("This system has %d DIMM sockets.\n", num_dimm);
|
|
}
|
|
|
|
if (!fake) {
|
|
dimm_fill.count = 0;
|
|
dimm_fill.mci = mci;
|
|
dmi_walk(ghes_edac_dmidecode, &dimm_fill);
|
|
} else {
|
|
struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
|
|
mci->n_layers, 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 at EDAC core\n");
|
|
edac_mc_free(mci);
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void ghes_edac_unregister(struct ghes *ghes)
|
|
{
|
|
struct mem_ctl_info *mci;
|
|
|
|
mci = ghes_pvt->mci;
|
|
edac_mc_del_mc(mci->pdev);
|
|
edac_mc_free(mci);
|
|
}
|