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![Shiju Jose](/assets/img/avatar_default.png)
Afterb9cae27728
("EDAC/ghes: Scan the system once on driver init") and with CONFIG_DEBUG_TEST_DRIVER_REMOVE enabled, ghes_hw.dimms becomes a NULL pointer after the second ->probe() (aka ghes_edac_register()) which the config option causes to be called. This happens because the static variable which holds down whether the system has been scanned already, doesn't get reset in ghes_edac_unregister(). Then, on the second probe, ghes_scan_system() doesn't get to enumerate the DIMMs, leading to ghes_hw.dimms remaining NULL. Clear the variable and rename it to something more descriptive so that a second probe succeeds. [ bp: Rewrite commit message. ] Fixes:b9cae27728
("EDAC/ghes: Scan the system once on driver init") Suggested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Shiju Jose <shiju.jose@huawei.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200827140450.1620-1-shiju.jose@huawei.com
656 lines
16 KiB
C
656 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GHES/EDAC Linux driver
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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_pvt {
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struct mem_ctl_info *mci;
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/* Buffers for the error handling routine */
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char other_detail[400];
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char msg[80];
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};
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static refcount_t ghes_refcount = REFCOUNT_INIT(0);
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/*
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* Access to ghes_pvt must be protected by ghes_lock. The spinlock
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* also provides the necessary (implicit) memory barrier for the SMP
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* case to make the pointer visible on another CPU.
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*/
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static struct ghes_pvt *ghes_pvt;
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/*
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* This driver's representation of the system hardware, as collected
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* from DMI.
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*/
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struct ghes_hw_desc {
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int num_dimms;
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struct dimm_info *dimms;
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} ghes_hw;
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/* GHES registration mutex */
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static DEFINE_MUTEX(ghes_reg_mutex);
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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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static bool system_scanned;
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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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static struct dimm_info *find_dimm_by_handle(struct mem_ctl_info *mci, u16 handle)
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{
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struct dimm_info *dimm;
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mci_for_each_dimm(mci, dimm) {
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if (dimm->smbios_handle == handle)
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return dimm;
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}
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return NULL;
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}
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static void dimm_setup_label(struct dimm_info *dimm, u16 handle)
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{
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const char *bank = NULL, *device = NULL;
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dmi_memdev_name(handle, &bank, &device);
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/* both strings must be non-zero */
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if (bank && *bank && device && *device)
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snprintf(dimm->label, sizeof(dimm->label), "%s %s", bank, device);
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}
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static void assign_dmi_dimm_info(struct dimm_info *dimm, struct memdev_dmi_entry *entry)
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{
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u16 rdr_mask = BIT(7) | BIT(13);
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if (entry->size == 0xffff) {
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pr_info("Can't get DIMM%i size\n", dimm->idx);
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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 & BIT(15))
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dimm->nr_pages = MiB_TO_PAGES((entry->size & 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 & BIT(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 & BIT(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 & BIT(12))
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dimm->mtype = MEM_NVDIMM;
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else if (entry->type_detail & BIT(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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case 0x1a:
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if (entry->type_detail & BIT(12))
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dimm->mtype = MEM_NVDIMM;
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else if (entry->type_detail & BIT(13))
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dimm->mtype = MEM_RDDR4;
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else
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dimm->mtype = MEM_DDR4;
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break;
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default:
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if (entry->type_detail & BIT(6))
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dimm->mtype = MEM_RMBS;
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else if ((entry->type_detail & rdr_mask) == rdr_mask)
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dimm->mtype = MEM_RDR;
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else if (entry->type_detail & BIT(7))
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dimm->mtype = MEM_SDR;
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else if (entry->type_detail & BIT(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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dimm_setup_label(dimm, entry->handle);
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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->idx, 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->smbios_handle = entry->handle;
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}
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static void enumerate_dimms(const struct dmi_header *dh, void *arg)
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{
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struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;
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struct ghes_hw_desc *hw = (struct ghes_hw_desc *)arg;
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struct dimm_info *d;
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if (dh->type != DMI_ENTRY_MEM_DEVICE)
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return;
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/* Enlarge the array with additional 16 */
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if (!hw->num_dimms || !(hw->num_dimms % 16)) {
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struct dimm_info *new;
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new = krealloc(hw->dimms, (hw->num_dimms + 16) * sizeof(struct dimm_info),
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GFP_KERNEL);
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if (!new) {
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WARN_ON_ONCE(1);
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return;
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}
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hw->dimms = new;
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}
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d = &hw->dimms[hw->num_dimms];
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d->idx = hw->num_dimms;
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assign_dmi_dimm_info(d, entry);
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hw->num_dimms++;
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}
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static void ghes_scan_system(void)
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{
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if (system_scanned)
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return;
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dmi_walk(enumerate_dimms, &ghes_hw);
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system_scanned = true;
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}
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void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
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{
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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_pvt *pvt;
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unsigned long flags;
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char *p;
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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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pvt = ghes_pvt;
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if (!pvt)
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goto unlock;
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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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e->grain = 1;
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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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e->type = HW_EVENT_ERR_CORRECTED;
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break;
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case GHES_SEV_RECOVERABLE:
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e->type = HW_EVENT_ERR_UNCORRECTED;
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break;
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case GHES_SEV_PANIC:
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e->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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e->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 = PHYS_PFN(mem_err->physical_addr);
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e->offset_in_page = offset_in_page(mem_err->physical_addr);
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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 + 1;
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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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struct dimm_info *dimm;
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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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dimm = find_dimm_by_handle(mci, mem_err->mem_dev_handle);
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if (dimm) {
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e->top_layer = dimm->idx;
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strcpy(e->label, dimm->label);
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}
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}
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if (p > e->location)
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*(p - 1) = '\0';
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if (!*e->label)
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strcpy(e->label, "unknown memory");
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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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p += snprintf(p, sizeof(pvt->other_detail),
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"APEI location: %s ", e->location);
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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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edac_raw_mc_handle_error(e);
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unlock:
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spin_unlock_irqrestore(&ghes_lock, flags);
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}
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/*
|
|
* 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 {
|
|
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;
|
|
|
|
mutex_lock(&ghes_reg_mutex);
|
|
|
|
system_scanned = false;
|
|
|
|
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);
|
|
}
|