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linux-zen-desktop/drivers/acpi/apei/ghes.c

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2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* APEI Generic Hardware Error Source support
*
* Generic Hardware Error Source provides a way to report platform
* hardware errors (such as that from chipset). It works in so called
* "Firmware First" mode, that is, hardware errors are reported to
* firmware firstly, then reported to Linux by firmware. This way,
* some non-standard hardware error registers or non-standard hardware
* link can be checked by firmware to produce more hardware error
* information for Linux.
*
* For more information about Generic Hardware Error Source, please
* refer to ACPI Specification version 4.0, section 17.3.2.6
*
* Copyright 2010,2011 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*/
#include <linux/arm_sdei.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/cper.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/ratelimit.h>
#include <linux/vmalloc.h>
#include <linux/irq_work.h>
#include <linux/llist.h>
#include <linux/genalloc.h>
#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/aer.h>
#include <linux/nmi.h>
#include <linux/sched/clock.h>
#include <linux/uuid.h>
#include <linux/ras.h>
#include <linux/task_work.h>
#include <acpi/actbl1.h>
#include <acpi/ghes.h>
#include <acpi/apei.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <ras/ras_event.h>
#include "apei-internal.h"
#define GHES_PFX "GHES: "
#define GHES_ESTATUS_MAX_SIZE 65536
#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
/* This is just an estimation for memory pool allocation */
#define GHES_ESTATUS_CACHE_AVG_SIZE 512
#define GHES_ESTATUS_CACHES_SIZE 4
#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
/* Prevent too many caches are allocated because of RCU */
#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
(sizeof(struct ghes_estatus_cache) + (estatus_len))
#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
((struct acpi_hest_generic_status *) \
((struct ghes_estatus_cache *)(estatus_cache) + 1))
#define GHES_ESTATUS_NODE_LEN(estatus_len) \
(sizeof(struct ghes_estatus_node) + (estatus_len))
#define GHES_ESTATUS_FROM_NODE(estatus_node) \
((struct acpi_hest_generic_status *) \
((struct ghes_estatus_node *)(estatus_node) + 1))
#define GHES_VENDOR_ENTRY_LEN(gdata_len) \
(sizeof(struct ghes_vendor_record_entry) + (gdata_len))
#define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry) \
((struct acpi_hest_generic_data *) \
((struct ghes_vendor_record_entry *)(vendor_entry) + 1))
/*
* NMI-like notifications vary by architecture, before the compiler can prune
* unused static functions it needs a value for these enums.
*/
#ifndef CONFIG_ARM_SDE_INTERFACE
#define FIX_APEI_GHES_SDEI_NORMAL __end_of_fixed_addresses
#define FIX_APEI_GHES_SDEI_CRITICAL __end_of_fixed_addresses
#endif
static ATOMIC_NOTIFIER_HEAD(ghes_report_chain);
static inline bool is_hest_type_generic_v2(struct ghes *ghes)
{
return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
}
/*
* This driver isn't really modular, however for the time being,
* continuing to use module_param is the easiest way to remain
* compatible with existing boot arg use cases.
*/
bool ghes_disable;
module_param_named(disable, ghes_disable, bool, 0);
/*
* "ghes.edac_force_enable" forcibly enables ghes_edac and skips the platform
* check.
*/
static bool ghes_edac_force_enable;
module_param_named(edac_force_enable, ghes_edac_force_enable, bool, 0);
/*
* All error sources notified with HED (Hardware Error Device) share a
* single notifier callback, so they need to be linked and checked one
* by one. This holds true for NMI too.
*
* RCU is used for these lists, so ghes_list_mutex is only used for
* list changing, not for traversing.
*/
static LIST_HEAD(ghes_hed);
static DEFINE_MUTEX(ghes_list_mutex);
/*
* A list of GHES devices which are given to the corresponding EDAC driver
* ghes_edac for further use.
*/
static LIST_HEAD(ghes_devs);
static DEFINE_MUTEX(ghes_devs_mutex);
/*
* Because the memory area used to transfer hardware error information
* from BIOS to Linux can be determined only in NMI, IRQ or timer
* handler, but general ioremap can not be used in atomic context, so
* the fixmap is used instead.
*
* This spinlock is used to prevent the fixmap entry from being used
* simultaneously.
*/
static DEFINE_SPINLOCK(ghes_notify_lock_irq);
struct ghes_vendor_record_entry {
struct work_struct work;
int error_severity;
char vendor_record[];
};
static struct gen_pool *ghes_estatus_pool;
static struct ghes_estatus_cache __rcu *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
static atomic_t ghes_estatus_cache_alloced;
static int ghes_panic_timeout __read_mostly = 30;
static void __iomem *ghes_map(u64 pfn, enum fixed_addresses fixmap_idx)
{
phys_addr_t paddr;
pgprot_t prot;
paddr = PFN_PHYS(pfn);
prot = arch_apei_get_mem_attribute(paddr);
__set_fixmap(fixmap_idx, paddr, prot);
return (void __iomem *) __fix_to_virt(fixmap_idx);
}
static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
{
int _idx = virt_to_fix((unsigned long)vaddr);
WARN_ON_ONCE(fixmap_idx != _idx);
clear_fixmap(fixmap_idx);
}
int ghes_estatus_pool_init(unsigned int num_ghes)
{
unsigned long addr, len;
int rc;
ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
if (!ghes_estatus_pool)
return -ENOMEM;
len = GHES_ESTATUS_CACHE_AVG_SIZE * GHES_ESTATUS_CACHE_ALLOCED_MAX;
len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
if (!addr)
goto err_pool_alloc;
rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
if (rc)
goto err_pool_add;
return 0;
err_pool_add:
vfree((void *)addr);
err_pool_alloc:
gen_pool_destroy(ghes_estatus_pool);
return -ENOMEM;
}
static int map_gen_v2(struct ghes *ghes)
{
return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
}
static void unmap_gen_v2(struct ghes *ghes)
{
apei_unmap_generic_address(&ghes->generic_v2->read_ack_register);
}
static void ghes_ack_error(struct acpi_hest_generic_v2 *gv2)
{
int rc;
u64 val = 0;
rc = apei_read(&val, &gv2->read_ack_register);
if (rc)
return;
val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
val |= gv2->read_ack_write << gv2->read_ack_register.bit_offset;
apei_write(val, &gv2->read_ack_register);
}
static struct ghes *ghes_new(struct acpi_hest_generic *generic)
{
struct ghes *ghes;
unsigned int error_block_length;
int rc;
ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
if (!ghes)
return ERR_PTR(-ENOMEM);
ghes->generic = generic;
if (is_hest_type_generic_v2(ghes)) {
rc = map_gen_v2(ghes);
if (rc)
goto err_free;
}
rc = apei_map_generic_address(&generic->error_status_address);
if (rc)
goto err_unmap_read_ack_addr;
error_block_length = generic->error_block_length;
if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
pr_warn(FW_WARN GHES_PFX
"Error status block length is too long: %u for "
"generic hardware error source: %d.\n",
error_block_length, generic->header.source_id);
error_block_length = GHES_ESTATUS_MAX_SIZE;
}
ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
if (!ghes->estatus) {
rc = -ENOMEM;
goto err_unmap_status_addr;
}
return ghes;
err_unmap_status_addr:
apei_unmap_generic_address(&generic->error_status_address);
err_unmap_read_ack_addr:
if (is_hest_type_generic_v2(ghes))
unmap_gen_v2(ghes);
err_free:
kfree(ghes);
return ERR_PTR(rc);
}
static void ghes_fini(struct ghes *ghes)
{
kfree(ghes->estatus);
apei_unmap_generic_address(&ghes->generic->error_status_address);
if (is_hest_type_generic_v2(ghes))
unmap_gen_v2(ghes);
}
static inline int ghes_severity(int severity)
{
switch (severity) {
case CPER_SEV_INFORMATIONAL:
return GHES_SEV_NO;
case CPER_SEV_CORRECTED:
return GHES_SEV_CORRECTED;
case CPER_SEV_RECOVERABLE:
return GHES_SEV_RECOVERABLE;
case CPER_SEV_FATAL:
return GHES_SEV_PANIC;
default:
/* Unknown, go panic */
return GHES_SEV_PANIC;
}
}
static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
int from_phys,
enum fixed_addresses fixmap_idx)
{
void __iomem *vaddr;
u64 offset;
u32 trunk;
while (len > 0) {
offset = paddr - (paddr & PAGE_MASK);
vaddr = ghes_map(PHYS_PFN(paddr), fixmap_idx);
trunk = PAGE_SIZE - offset;
trunk = min(trunk, len);
if (from_phys)
memcpy_fromio(buffer, vaddr + offset, trunk);
else
memcpy_toio(vaddr + offset, buffer, trunk);
len -= trunk;
paddr += trunk;
buffer += trunk;
ghes_unmap(vaddr, fixmap_idx);
}
}
/* Check the top-level record header has an appropriate size. */
static int __ghes_check_estatus(struct ghes *ghes,
struct acpi_hest_generic_status *estatus)
{
u32 len = cper_estatus_len(estatus);
if (len < sizeof(*estatus)) {
pr_warn_ratelimited(FW_WARN GHES_PFX "Truncated error status block!\n");
return -EIO;
}
if (len > ghes->generic->error_block_length) {
pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid error status block length!\n");
return -EIO;
}
if (cper_estatus_check_header(estatus)) {
pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid CPER header!\n");
return -EIO;
}
return 0;
}
/* Read the CPER block, returning its address, and header in estatus. */
static int __ghes_peek_estatus(struct ghes *ghes,
struct acpi_hest_generic_status *estatus,
u64 *buf_paddr, enum fixed_addresses fixmap_idx)
{
struct acpi_hest_generic *g = ghes->generic;
int rc;
rc = apei_read(buf_paddr, &g->error_status_address);
if (rc) {
*buf_paddr = 0;
pr_warn_ratelimited(FW_WARN GHES_PFX
"Failed to read error status block address for hardware error source: %d.\n",
g->header.source_id);
return -EIO;
}
if (!*buf_paddr)
return -ENOENT;
ghes_copy_tofrom_phys(estatus, *buf_paddr, sizeof(*estatus), 1,
fixmap_idx);
if (!estatus->block_status) {
*buf_paddr = 0;
return -ENOENT;
}
return 0;
}
static int __ghes_read_estatus(struct acpi_hest_generic_status *estatus,
u64 buf_paddr, enum fixed_addresses fixmap_idx,
size_t buf_len)
{
ghes_copy_tofrom_phys(estatus, buf_paddr, buf_len, 1, fixmap_idx);
if (cper_estatus_check(estatus)) {
pr_warn_ratelimited(FW_WARN GHES_PFX
"Failed to read error status block!\n");
return -EIO;
}
return 0;
}
static int ghes_read_estatus(struct ghes *ghes,
struct acpi_hest_generic_status *estatus,
u64 *buf_paddr, enum fixed_addresses fixmap_idx)
{
int rc;
rc = __ghes_peek_estatus(ghes, estatus, buf_paddr, fixmap_idx);
if (rc)
return rc;
rc = __ghes_check_estatus(ghes, estatus);
if (rc)
return rc;
return __ghes_read_estatus(estatus, *buf_paddr, fixmap_idx,
cper_estatus_len(estatus));
}
static void ghes_clear_estatus(struct ghes *ghes,
struct acpi_hest_generic_status *estatus,
u64 buf_paddr, enum fixed_addresses fixmap_idx)
{
estatus->block_status = 0;
if (!buf_paddr)
return;
ghes_copy_tofrom_phys(estatus, buf_paddr,
sizeof(estatus->block_status), 0,
fixmap_idx);
/*
* GHESv2 type HEST entries introduce support for error acknowledgment,
* so only acknowledge the error if this support is present.
*/
if (is_hest_type_generic_v2(ghes))
ghes_ack_error(ghes->generic_v2);
}
/*
* Called as task_work before returning to user-space.
* Ensure any queued work has been done before we return to the context that
* triggered the notification.
*/
static void ghes_kick_task_work(struct callback_head *head)
{
struct acpi_hest_generic_status *estatus;
struct ghes_estatus_node *estatus_node;
u32 node_len;
estatus_node = container_of(head, struct ghes_estatus_node, task_work);
if (IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
memory_failure_queue_kick(estatus_node->task_work_cpu);
estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
node_len = GHES_ESTATUS_NODE_LEN(cper_estatus_len(estatus));
gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, node_len);
}
static bool ghes_do_memory_failure(u64 physical_addr, int flags)
{
unsigned long pfn;
if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
return false;
pfn = PHYS_PFN(physical_addr);
if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
pr_warn_ratelimited(FW_WARN GHES_PFX
"Invalid address in generic error data: %#llx\n",
physical_addr);
return false;
}
memory_failure_queue(pfn, flags);
return true;
}
static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
int sev)
{
int flags = -1;
int sec_sev = ghes_severity(gdata->error_severity);
struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
return false;
/* iff following two events can be handled properly by now */
if (sec_sev == GHES_SEV_CORRECTED &&
(gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
flags = MF_SOFT_OFFLINE;
if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
flags = 0;
if (flags != -1)
return ghes_do_memory_failure(mem_err->physical_addr, flags);
return false;
}
static bool ghes_handle_arm_hw_error(struct acpi_hest_generic_data *gdata, int sev)
{
struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
bool queued = false;
int sec_sev, i;
char *p;
log_arm_hw_error(err);
sec_sev = ghes_severity(gdata->error_severity);
if (sev != GHES_SEV_RECOVERABLE || sec_sev != GHES_SEV_RECOVERABLE)
return false;
p = (char *)(err + 1);
for (i = 0; i < err->err_info_num; i++) {
struct cper_arm_err_info *err_info = (struct cper_arm_err_info *)p;
bool is_cache = (err_info->type == CPER_ARM_CACHE_ERROR);
bool has_pa = (err_info->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR);
const char *error_type = "unknown error";
/*
* The field (err_info->error_info & BIT(26)) is fixed to set to
* 1 in some old firmware of HiSilicon Kunpeng920. We assume that
* firmware won't mix corrected errors in an uncorrected section,
* and don't filter out 'corrected' error here.
*/
if (is_cache && has_pa) {
queued = ghes_do_memory_failure(err_info->physical_fault_addr, 0);
p += err_info->length;
continue;
}
if (err_info->type < ARRAY_SIZE(cper_proc_error_type_strs))
error_type = cper_proc_error_type_strs[err_info->type];
pr_warn_ratelimited(FW_WARN GHES_PFX
"Unhandled processor error type: %s\n",
error_type);
p += err_info->length;
}
return queued;
}
/*
* PCIe AER errors need to be sent to the AER driver for reporting and
* recovery. The GHES severities map to the following AER severities and
* require the following handling:
*
* GHES_SEV_CORRECTABLE -> AER_CORRECTABLE
* These need to be reported by the AER driver but no recovery is
* necessary.
* GHES_SEV_RECOVERABLE -> AER_NONFATAL
* GHES_SEV_RECOVERABLE && CPER_SEC_RESET -> AER_FATAL
* These both need to be reported and recovered from by the AER driver.
* GHES_SEV_PANIC does not make it to this handling since the kernel must
* panic.
*/
static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
{
#ifdef CONFIG_ACPI_APEI_PCIEAER
struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
unsigned int devfn;
int aer_severity;
devfn = PCI_DEVFN(pcie_err->device_id.device,
pcie_err->device_id.function);
aer_severity = cper_severity_to_aer(gdata->error_severity);
/*
* If firmware reset the component to contain
* the error, we must reinitialize it before
* use, so treat it as a fatal AER error.
*/
if (gdata->flags & CPER_SEC_RESET)
aer_severity = AER_FATAL;
aer_recover_queue(pcie_err->device_id.segment,
pcie_err->device_id.bus,
devfn, aer_severity,
(struct aer_capability_regs *)
pcie_err->aer_info);
}
#endif
}
static BLOCKING_NOTIFIER_HEAD(vendor_record_notify_list);
int ghes_register_vendor_record_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&vendor_record_notify_list, nb);
}
EXPORT_SYMBOL_GPL(ghes_register_vendor_record_notifier);
void ghes_unregister_vendor_record_notifier(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&vendor_record_notify_list, nb);
}
EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
static void ghes_vendor_record_work_func(struct work_struct *work)
{
struct ghes_vendor_record_entry *entry;
struct acpi_hest_generic_data *gdata;
u32 len;
entry = container_of(work, struct ghes_vendor_record_entry, work);
gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
blocking_notifier_call_chain(&vendor_record_notify_list,
entry->error_severity, gdata);
len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
gen_pool_free(ghes_estatus_pool, (unsigned long)entry, len);
}
static void ghes_defer_non_standard_event(struct acpi_hest_generic_data *gdata,
int sev)
{
struct acpi_hest_generic_data *copied_gdata;
struct ghes_vendor_record_entry *entry;
u32 len;
len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
entry = (void *)gen_pool_alloc(ghes_estatus_pool, len);
if (!entry)
return;
copied_gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
memcpy(copied_gdata, gdata, acpi_hest_get_record_size(gdata));
entry->error_severity = sev;
INIT_WORK(&entry->work, ghes_vendor_record_work_func);
schedule_work(&entry->work);
}
static bool ghes_do_proc(struct ghes *ghes,
const struct acpi_hest_generic_status *estatus)
{
int sev, sec_sev;
struct acpi_hest_generic_data *gdata;
guid_t *sec_type;
const guid_t *fru_id = &guid_null;
char *fru_text = "";
bool queued = false;
sev = ghes_severity(estatus->error_severity);
apei_estatus_for_each_section(estatus, gdata) {
sec_type = (guid_t *)gdata->section_type;
sec_sev = ghes_severity(gdata->error_severity);
if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
fru_id = (guid_t *)gdata->fru_id;
if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
fru_text = gdata->fru_text;
if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
atomic_notifier_call_chain(&ghes_report_chain, sev, mem_err);
arch_apei_report_mem_error(sev, mem_err);
queued = ghes_handle_memory_failure(gdata, sev);
}
else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
ghes_handle_aer(gdata);
}
else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
queued = ghes_handle_arm_hw_error(gdata, sev);
} else {
void *err = acpi_hest_get_payload(gdata);
ghes_defer_non_standard_event(gdata, sev);
log_non_standard_event(sec_type, fru_id, fru_text,
sec_sev, err,
gdata->error_data_length);
}
}
return queued;
}
static void __ghes_print_estatus(const char *pfx,
const struct acpi_hest_generic *generic,
const struct acpi_hest_generic_status *estatus)
{
static atomic_t seqno;
unsigned int curr_seqno;
char pfx_seq[64];
if (pfx == NULL) {
if (ghes_severity(estatus->error_severity) <=
GHES_SEV_CORRECTED)
pfx = KERN_WARNING;
else
pfx = KERN_ERR;
}
curr_seqno = atomic_inc_return(&seqno);
snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
pfx_seq, generic->header.source_id);
cper_estatus_print(pfx_seq, estatus);
}
static int ghes_print_estatus(const char *pfx,
const struct acpi_hest_generic *generic,
const struct acpi_hest_generic_status *estatus)
{
/* Not more than 2 messages every 5 seconds */
static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
struct ratelimit_state *ratelimit;
if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
ratelimit = &ratelimit_corrected;
else
ratelimit = &ratelimit_uncorrected;
if (__ratelimit(ratelimit)) {
__ghes_print_estatus(pfx, generic, estatus);
return 1;
}
return 0;
}
/*
* GHES error status reporting throttle, to report more kinds of
* errors, instead of just most frequently occurred errors.
*/
static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
{
u32 len;
int i, cached = 0;
unsigned long long now;
struct ghes_estatus_cache *cache;
struct acpi_hest_generic_status *cache_estatus;
len = cper_estatus_len(estatus);
rcu_read_lock();
for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
cache = rcu_dereference(ghes_estatus_caches[i]);
if (cache == NULL)
continue;
if (len != cache->estatus_len)
continue;
cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
if (memcmp(estatus, cache_estatus, len))
continue;
atomic_inc(&cache->count);
now = sched_clock();
if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
cached = 1;
break;
}
rcu_read_unlock();
return cached;
}
static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
struct acpi_hest_generic *generic,
struct acpi_hest_generic_status *estatus)
{
int alloced;
u32 len, cache_len;
struct ghes_estatus_cache *cache;
struct acpi_hest_generic_status *cache_estatus;
alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
atomic_dec(&ghes_estatus_cache_alloced);
return NULL;
}
len = cper_estatus_len(estatus);
cache_len = GHES_ESTATUS_CACHE_LEN(len);
cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
if (!cache) {
atomic_dec(&ghes_estatus_cache_alloced);
return NULL;
}
cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
memcpy(cache_estatus, estatus, len);
cache->estatus_len = len;
atomic_set(&cache->count, 0);
cache->generic = generic;
cache->time_in = sched_clock();
return cache;
}
static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
{
struct ghes_estatus_cache *cache;
u32 len;
cache = container_of(head, struct ghes_estatus_cache, rcu);
len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
len = GHES_ESTATUS_CACHE_LEN(len);
gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
atomic_dec(&ghes_estatus_cache_alloced);
}
static void
ghes_estatus_cache_add(struct acpi_hest_generic *generic,
struct acpi_hest_generic_status *estatus)
{
unsigned long long now, duration, period, max_period = 0;
struct ghes_estatus_cache *cache, *new_cache;
struct ghes_estatus_cache __rcu *victim;
int i, slot = -1, count;
new_cache = ghes_estatus_cache_alloc(generic, estatus);
if (!new_cache)
return;
rcu_read_lock();
now = sched_clock();
for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
cache = rcu_dereference(ghes_estatus_caches[i]);
if (cache == NULL) {
slot = i;
break;
}
duration = now - cache->time_in;
if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
slot = i;
break;
}
count = atomic_read(&cache->count);
period = duration;
do_div(period, (count + 1));
if (period > max_period) {
max_period = period;
slot = i;
}
}
rcu_read_unlock();
if (slot != -1) {
/*
* Use release semantics to ensure that ghes_estatus_cached()
* running on another CPU will see the updated cache fields if
* it can see the new value of the pointer.
*/
victim = xchg_release(&ghes_estatus_caches[slot],
RCU_INITIALIZER(new_cache));
/*
* At this point, victim may point to a cached item different
* from the one based on which we selected the slot. Instead of
* going to the loop again to pick another slot, let's just
* drop the other item anyway: this may cause a false cache
* miss later on, but that won't cause any problems.
*/
if (victim)
call_rcu(&unrcu_pointer(victim)->rcu,
ghes_estatus_cache_rcu_free);
}
}
static void __ghes_panic(struct ghes *ghes,
struct acpi_hest_generic_status *estatus,
u64 buf_paddr, enum fixed_addresses fixmap_idx)
{
__ghes_print_estatus(KERN_EMERG, ghes->generic, estatus);
ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
/* reboot to log the error! */
if (!panic_timeout)
panic_timeout = ghes_panic_timeout;
panic("Fatal hardware error!");
}
static int ghes_proc(struct ghes *ghes)
{
struct acpi_hest_generic_status *estatus = ghes->estatus;
u64 buf_paddr;
int rc;
rc = ghes_read_estatus(ghes, estatus, &buf_paddr, FIX_APEI_GHES_IRQ);
if (rc)
goto out;
if (ghes_severity(estatus->error_severity) >= GHES_SEV_PANIC)
__ghes_panic(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
if (!ghes_estatus_cached(estatus)) {
if (ghes_print_estatus(NULL, ghes->generic, estatus))
ghes_estatus_cache_add(ghes->generic, estatus);
}
ghes_do_proc(ghes, estatus);
out:
ghes_clear_estatus(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
return rc;
}
static void ghes_add_timer(struct ghes *ghes)
{
struct acpi_hest_generic *g = ghes->generic;
unsigned long expire;
if (!g->notify.poll_interval) {
pr_warn(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
g->header.source_id);
return;
}
expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
ghes->timer.expires = round_jiffies_relative(expire);
add_timer(&ghes->timer);
}
static void ghes_poll_func(struct timer_list *t)
{
struct ghes *ghes = from_timer(ghes, t, timer);
unsigned long flags;
spin_lock_irqsave(&ghes_notify_lock_irq, flags);
ghes_proc(ghes);
spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
if (!(ghes->flags & GHES_EXITING))
ghes_add_timer(ghes);
}
static irqreturn_t ghes_irq_func(int irq, void *data)
{
struct ghes *ghes = data;
unsigned long flags;
int rc;
spin_lock_irqsave(&ghes_notify_lock_irq, flags);
rc = ghes_proc(ghes);
spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
if (rc)
return IRQ_NONE;
return IRQ_HANDLED;
}
static int ghes_notify_hed(struct notifier_block *this, unsigned long event,
void *data)
{
struct ghes *ghes;
unsigned long flags;
int ret = NOTIFY_DONE;
spin_lock_irqsave(&ghes_notify_lock_irq, flags);
rcu_read_lock();
list_for_each_entry_rcu(ghes, &ghes_hed, list) {
if (!ghes_proc(ghes))
ret = NOTIFY_OK;
}
rcu_read_unlock();
spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
return ret;
}
static struct notifier_block ghes_notifier_hed = {
.notifier_call = ghes_notify_hed,
};
/*
* Handlers for CPER records may not be NMI safe. For example,
* memory_failure_queue() takes spinlocks and calls schedule_work_on().
* In any NMI-like handler, memory from ghes_estatus_pool is used to save
* estatus, and added to the ghes_estatus_llist. irq_work_queue() causes
* ghes_proc_in_irq() to run in IRQ context where each estatus in
* ghes_estatus_llist is processed.
*
* Memory from the ghes_estatus_pool is also used with the ghes_estatus_cache
* to suppress frequent messages.
*/
static struct llist_head ghes_estatus_llist;
static struct irq_work ghes_proc_irq_work;
static void ghes_proc_in_irq(struct irq_work *irq_work)
{
struct llist_node *llnode, *next;
struct ghes_estatus_node *estatus_node;
struct acpi_hest_generic *generic;
struct acpi_hest_generic_status *estatus;
bool task_work_pending;
u32 len, node_len;
int ret;
llnode = llist_del_all(&ghes_estatus_llist);
/*
* Because the time order of estatus in list is reversed,
* revert it back to proper order.
*/
llnode = llist_reverse_order(llnode);
while (llnode) {
next = llnode->next;
estatus_node = llist_entry(llnode, struct ghes_estatus_node,
llnode);
estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
len = cper_estatus_len(estatus);
node_len = GHES_ESTATUS_NODE_LEN(len);
task_work_pending = ghes_do_proc(estatus_node->ghes, estatus);
if (!ghes_estatus_cached(estatus)) {
generic = estatus_node->generic;
if (ghes_print_estatus(NULL, generic, estatus))
ghes_estatus_cache_add(generic, estatus);
}
if (task_work_pending && current->mm) {
estatus_node->task_work.func = ghes_kick_task_work;
estatus_node->task_work_cpu = smp_processor_id();
ret = task_work_add(current, &estatus_node->task_work,
TWA_RESUME);
if (ret)
estatus_node->task_work.func = NULL;
}
if (!estatus_node->task_work.func)
gen_pool_free(ghes_estatus_pool,
(unsigned long)estatus_node, node_len);
llnode = next;
}
}
static void ghes_print_queued_estatus(void)
{
struct llist_node *llnode;
struct ghes_estatus_node *estatus_node;
struct acpi_hest_generic *generic;
struct acpi_hest_generic_status *estatus;
llnode = llist_del_all(&ghes_estatus_llist);
/*
* Because the time order of estatus in list is reversed,
* revert it back to proper order.
*/
llnode = llist_reverse_order(llnode);
while (llnode) {
estatus_node = llist_entry(llnode, struct ghes_estatus_node,
llnode);
estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
generic = estatus_node->generic;
ghes_print_estatus(NULL, generic, estatus);
llnode = llnode->next;
}
}
static int ghes_in_nmi_queue_one_entry(struct ghes *ghes,
enum fixed_addresses fixmap_idx)
{
struct acpi_hest_generic_status *estatus, tmp_header;
struct ghes_estatus_node *estatus_node;
u32 len, node_len;
u64 buf_paddr;
int sev, rc;
if (!IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG))
return -EOPNOTSUPP;
rc = __ghes_peek_estatus(ghes, &tmp_header, &buf_paddr, fixmap_idx);
if (rc) {
ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
return rc;
}
rc = __ghes_check_estatus(ghes, &tmp_header);
if (rc) {
ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
return rc;
}
len = cper_estatus_len(&tmp_header);
node_len = GHES_ESTATUS_NODE_LEN(len);
estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, node_len);
if (!estatus_node)
return -ENOMEM;
estatus_node->ghes = ghes;
estatus_node->generic = ghes->generic;
estatus_node->task_work.func = NULL;
estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
if (__ghes_read_estatus(estatus, buf_paddr, fixmap_idx, len)) {
ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
rc = -ENOENT;
goto no_work;
}
sev = ghes_severity(estatus->error_severity);
if (sev >= GHES_SEV_PANIC) {
ghes_print_queued_estatus();
__ghes_panic(ghes, estatus, buf_paddr, fixmap_idx);
}
ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
/* This error has been reported before, don't process it again. */
if (ghes_estatus_cached(estatus))
goto no_work;
llist_add(&estatus_node->llnode, &ghes_estatus_llist);
return rc;
no_work:
gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
node_len);
return rc;
}
static int ghes_in_nmi_spool_from_list(struct list_head *rcu_list,
enum fixed_addresses fixmap_idx)
{
int ret = -ENOENT;
struct ghes *ghes;
rcu_read_lock();
list_for_each_entry_rcu(ghes, rcu_list, list) {
if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx))
ret = 0;
}
rcu_read_unlock();
if (IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG) && !ret)
irq_work_queue(&ghes_proc_irq_work);
return ret;
}
#ifdef CONFIG_ACPI_APEI_SEA
static LIST_HEAD(ghes_sea);
/*
* Return 0 only if one of the SEA error sources successfully reported an error
* record sent from the firmware.
*/
int ghes_notify_sea(void)
{
static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sea);
int rv;
raw_spin_lock(&ghes_notify_lock_sea);
rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
raw_spin_unlock(&ghes_notify_lock_sea);
return rv;
}
static void ghes_sea_add(struct ghes *ghes)
{
mutex_lock(&ghes_list_mutex);
list_add_rcu(&ghes->list, &ghes_sea);
mutex_unlock(&ghes_list_mutex);
}
static void ghes_sea_remove(struct ghes *ghes)
{
mutex_lock(&ghes_list_mutex);
list_del_rcu(&ghes->list);
mutex_unlock(&ghes_list_mutex);
synchronize_rcu();
}
#else /* CONFIG_ACPI_APEI_SEA */
static inline void ghes_sea_add(struct ghes *ghes) { }
static inline void ghes_sea_remove(struct ghes *ghes) { }
#endif /* CONFIG_ACPI_APEI_SEA */
#ifdef CONFIG_HAVE_ACPI_APEI_NMI
/*
* NMI may be triggered on any CPU, so ghes_in_nmi is used for
* having only one concurrent reader.
*/
static atomic_t ghes_in_nmi = ATOMIC_INIT(0);
static LIST_HEAD(ghes_nmi);
static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
{
static DEFINE_RAW_SPINLOCK(ghes_notify_lock_nmi);
int ret = NMI_DONE;
if (!atomic_add_unless(&ghes_in_nmi, 1, 1))
return ret;
raw_spin_lock(&ghes_notify_lock_nmi);
if (!ghes_in_nmi_spool_from_list(&ghes_nmi, FIX_APEI_GHES_NMI))
ret = NMI_HANDLED;
raw_spin_unlock(&ghes_notify_lock_nmi);
atomic_dec(&ghes_in_nmi);
return ret;
}
static void ghes_nmi_add(struct ghes *ghes)
{
mutex_lock(&ghes_list_mutex);
if (list_empty(&ghes_nmi))
register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
list_add_rcu(&ghes->list, &ghes_nmi);
mutex_unlock(&ghes_list_mutex);
}
static void ghes_nmi_remove(struct ghes *ghes)
{
mutex_lock(&ghes_list_mutex);
list_del_rcu(&ghes->list);
if (list_empty(&ghes_nmi))
unregister_nmi_handler(NMI_LOCAL, "ghes");
mutex_unlock(&ghes_list_mutex);
/*
* To synchronize with NMI handler, ghes can only be
* freed after NMI handler finishes.
*/
synchronize_rcu();
}
#else /* CONFIG_HAVE_ACPI_APEI_NMI */
static inline void ghes_nmi_add(struct ghes *ghes) { }
static inline void ghes_nmi_remove(struct ghes *ghes) { }
#endif /* CONFIG_HAVE_ACPI_APEI_NMI */
static void ghes_nmi_init_cxt(void)
{
init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
}
static int __ghes_sdei_callback(struct ghes *ghes,
enum fixed_addresses fixmap_idx)
{
if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx)) {
irq_work_queue(&ghes_proc_irq_work);
return 0;
}
return -ENOENT;
}
static int ghes_sdei_normal_callback(u32 event_num, struct pt_regs *regs,
void *arg)
{
static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_normal);
struct ghes *ghes = arg;
int err;
raw_spin_lock(&ghes_notify_lock_sdei_normal);
err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_NORMAL);
raw_spin_unlock(&ghes_notify_lock_sdei_normal);
return err;
}
static int ghes_sdei_critical_callback(u32 event_num, struct pt_regs *regs,
void *arg)
{
static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_critical);
struct ghes *ghes = arg;
int err;
raw_spin_lock(&ghes_notify_lock_sdei_critical);
err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_CRITICAL);
raw_spin_unlock(&ghes_notify_lock_sdei_critical);
return err;
}
static int apei_sdei_register_ghes(struct ghes *ghes)
{
if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
return -EOPNOTSUPP;
return sdei_register_ghes(ghes, ghes_sdei_normal_callback,
ghes_sdei_critical_callback);
}
static int apei_sdei_unregister_ghes(struct ghes *ghes)
{
if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
return -EOPNOTSUPP;
return sdei_unregister_ghes(ghes);
}
static int ghes_probe(struct platform_device *ghes_dev)
{
struct acpi_hest_generic *generic;
struct ghes *ghes = NULL;
unsigned long flags;
int rc = -EINVAL;
generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
if (!generic->enabled)
return -ENODEV;
switch (generic->notify.type) {
case ACPI_HEST_NOTIFY_POLLED:
case ACPI_HEST_NOTIFY_EXTERNAL:
case ACPI_HEST_NOTIFY_SCI:
case ACPI_HEST_NOTIFY_GSIV:
case ACPI_HEST_NOTIFY_GPIO:
break;
case ACPI_HEST_NOTIFY_SEA:
if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
generic->header.source_id);
rc = -ENOTSUPP;
goto err;
}
break;
case ACPI_HEST_NOTIFY_NMI:
if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
generic->header.source_id);
goto err;
}
break;
case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE)) {
pr_warn(GHES_PFX "Generic hardware error source: %d notified via SDE Interface is not supported!\n",
generic->header.source_id);
goto err;
}
break;
case ACPI_HEST_NOTIFY_LOCAL:
pr_warn(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
generic->header.source_id);
goto err;
default:
pr_warn(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
generic->notify.type, generic->header.source_id);
goto err;
}
rc = -EIO;
if (generic->error_block_length <
sizeof(struct acpi_hest_generic_status)) {
pr_warn(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
generic->error_block_length, generic->header.source_id);
goto err;
}
ghes = ghes_new(generic);
if (IS_ERR(ghes)) {
rc = PTR_ERR(ghes);
ghes = NULL;
goto err;
}
switch (generic->notify.type) {
case ACPI_HEST_NOTIFY_POLLED:
timer_setup(&ghes->timer, ghes_poll_func, 0);
ghes_add_timer(ghes);
break;
case ACPI_HEST_NOTIFY_EXTERNAL:
/* External interrupt vector is GSI */
rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
if (rc) {
pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
generic->header.source_id);
goto err;
}
rc = request_irq(ghes->irq, ghes_irq_func, IRQF_SHARED,
"GHES IRQ", ghes);
if (rc) {
pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
generic->header.source_id);
goto err;
}
break;
case ACPI_HEST_NOTIFY_SCI:
case ACPI_HEST_NOTIFY_GSIV:
case ACPI_HEST_NOTIFY_GPIO:
mutex_lock(&ghes_list_mutex);
if (list_empty(&ghes_hed))
register_acpi_hed_notifier(&ghes_notifier_hed);
list_add_rcu(&ghes->list, &ghes_hed);
mutex_unlock(&ghes_list_mutex);
break;
case ACPI_HEST_NOTIFY_SEA:
ghes_sea_add(ghes);
break;
case ACPI_HEST_NOTIFY_NMI:
ghes_nmi_add(ghes);
break;
case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
rc = apei_sdei_register_ghes(ghes);
if (rc)
goto err;
break;
default:
BUG();
}
platform_set_drvdata(ghes_dev, ghes);
ghes->dev = &ghes_dev->dev;
mutex_lock(&ghes_devs_mutex);
list_add_tail(&ghes->elist, &ghes_devs);
mutex_unlock(&ghes_devs_mutex);
/* Handle any pending errors right away */
spin_lock_irqsave(&ghes_notify_lock_irq, flags);
ghes_proc(ghes);
spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
return 0;
err:
if (ghes) {
ghes_fini(ghes);
kfree(ghes);
}
return rc;
}
static int ghes_remove(struct platform_device *ghes_dev)
{
int rc;
struct ghes *ghes;
struct acpi_hest_generic *generic;
ghes = platform_get_drvdata(ghes_dev);
generic = ghes->generic;
ghes->flags |= GHES_EXITING;
switch (generic->notify.type) {
case ACPI_HEST_NOTIFY_POLLED:
timer_shutdown_sync(&ghes->timer);
break;
case ACPI_HEST_NOTIFY_EXTERNAL:
free_irq(ghes->irq, ghes);
break;
case ACPI_HEST_NOTIFY_SCI:
case ACPI_HEST_NOTIFY_GSIV:
case ACPI_HEST_NOTIFY_GPIO:
mutex_lock(&ghes_list_mutex);
list_del_rcu(&ghes->list);
if (list_empty(&ghes_hed))
unregister_acpi_hed_notifier(&ghes_notifier_hed);
mutex_unlock(&ghes_list_mutex);
synchronize_rcu();
break;
case ACPI_HEST_NOTIFY_SEA:
ghes_sea_remove(ghes);
break;
case ACPI_HEST_NOTIFY_NMI:
ghes_nmi_remove(ghes);
break;
case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
rc = apei_sdei_unregister_ghes(ghes);
if (rc)
return rc;
break;
default:
BUG();
break;
}
ghes_fini(ghes);
mutex_lock(&ghes_devs_mutex);
list_del(&ghes->elist);
mutex_unlock(&ghes_devs_mutex);
kfree(ghes);
return 0;
}
static struct platform_driver ghes_platform_driver = {
.driver = {
.name = "GHES",
},
.probe = ghes_probe,
.remove = ghes_remove,
};
void __init acpi_ghes_init(void)
{
int rc;
sdei_init();
if (acpi_disabled)
return;
switch (hest_disable) {
case HEST_NOT_FOUND:
return;
case HEST_DISABLED:
pr_info(GHES_PFX "HEST is not enabled!\n");
return;
default:
break;
}
if (ghes_disable) {
pr_info(GHES_PFX "GHES is not enabled!\n");
return;
}
ghes_nmi_init_cxt();
rc = platform_driver_register(&ghes_platform_driver);
if (rc)
return;
rc = apei_osc_setup();
if (rc == 0 && osc_sb_apei_support_acked)
pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
else if (rc == 0 && !osc_sb_apei_support_acked)
pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
else if (rc && osc_sb_apei_support_acked)
pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
else
pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
}
/*
* Known x86 systems that prefer GHES error reporting:
*/
static struct acpi_platform_list plat_list[] = {
{"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
{ } /* End */
};
struct list_head *ghes_get_devices(void)
{
int idx = -1;
if (IS_ENABLED(CONFIG_X86)) {
idx = acpi_match_platform_list(plat_list);
if (idx < 0) {
if (!ghes_edac_force_enable)
return NULL;
pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
}
6.5.5
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} else if (list_empty(&ghes_devs)) {
return NULL;
Initial commit
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}
return &ghes_devs;
}
EXPORT_SYMBOL_GPL(ghes_get_devices);
void ghes_register_report_chain(struct notifier_block *nb)
{
atomic_notifier_chain_register(&ghes_report_chain, nb);
}
EXPORT_SYMBOL_GPL(ghes_register_report_chain);
void ghes_unregister_report_chain(struct notifier_block *nb)
{
atomic_notifier_chain_unregister(&ghes_report_chain, nb);
}
EXPORT_SYMBOL_GPL(ghes_unregister_report_chain);