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f9f05395f3
If the GHES notification type is SDEI, register the provided event using the SDEI-GHES helper. SDEI may be one of two types of event, normal and critical. Critical events can interrupt normal events, so these must have separate fixmap slots and locks in case both event types are in use. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1350 lines
35 KiB
C
1350 lines
35 KiB
C
/*
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* APEI Generic Hardware Error Source support
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*
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* Generic Hardware Error Source provides a way to report platform
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* hardware errors (such as that from chipset). It works in so called
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* "Firmware First" mode, that is, hardware errors are reported to
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* firmware firstly, then reported to Linux by firmware. This way,
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* some non-standard hardware error registers or non-standard hardware
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* link can be checked by firmware to produce more hardware error
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* information for Linux.
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*
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* For more information about Generic Hardware Error Source, please
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* refer to ACPI Specification version 4.0, section 17.3.2.6
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*
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* Copyright 2010,2011 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/arm_sdei.h>
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/cper.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/ratelimit.h>
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#include <linux/vmalloc.h>
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#include <linux/irq_work.h>
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#include <linux/llist.h>
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#include <linux/genalloc.h>
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#include <linux/pci.h>
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#include <linux/pfn.h>
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#include <linux/aer.h>
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#include <linux/nmi.h>
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#include <linux/sched/clock.h>
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#include <linux/uuid.h>
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#include <linux/ras.h>
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#include <acpi/actbl1.h>
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#include <acpi/ghes.h>
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#include <acpi/apei.h>
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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#include <ras/ras_event.h>
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#include "apei-internal.h"
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#define GHES_PFX "GHES: "
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#define GHES_ESTATUS_MAX_SIZE 65536
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#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
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#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
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/* This is just an estimation for memory pool allocation */
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#define GHES_ESTATUS_CACHE_AVG_SIZE 512
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#define GHES_ESTATUS_CACHES_SIZE 4
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#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
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/* Prevent too many caches are allocated because of RCU */
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#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
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#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
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(sizeof(struct ghes_estatus_cache) + (estatus_len))
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#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
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((struct acpi_hest_generic_status *) \
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((struct ghes_estatus_cache *)(estatus_cache) + 1))
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#define GHES_ESTATUS_NODE_LEN(estatus_len) \
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(sizeof(struct ghes_estatus_node) + (estatus_len))
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#define GHES_ESTATUS_FROM_NODE(estatus_node) \
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((struct acpi_hest_generic_status *) \
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((struct ghes_estatus_node *)(estatus_node) + 1))
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/*
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* NMI-like notifications vary by architecture, before the compiler can prune
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* unused static functions it needs a value for these enums.
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*/
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#ifndef CONFIG_ARM_SDE_INTERFACE
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#define FIX_APEI_GHES_SDEI_NORMAL __end_of_fixed_addresses
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#define FIX_APEI_GHES_SDEI_CRITICAL __end_of_fixed_addresses
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#endif
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static inline bool is_hest_type_generic_v2(struct ghes *ghes)
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{
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return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
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}
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/*
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* This driver isn't really modular, however for the time being,
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* continuing to use module_param is the easiest way to remain
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* compatible with existing boot arg use cases.
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*/
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bool ghes_disable;
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module_param_named(disable, ghes_disable, bool, 0);
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/*
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* All error sources notified with HED (Hardware Error Device) share a
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* single notifier callback, so they need to be linked and checked one
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* by one. This holds true for NMI too.
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*
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* RCU is used for these lists, so ghes_list_mutex is only used for
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* list changing, not for traversing.
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*/
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static LIST_HEAD(ghes_hed);
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static DEFINE_MUTEX(ghes_list_mutex);
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/*
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* Because the memory area used to transfer hardware error information
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* from BIOS to Linux can be determined only in NMI, IRQ or timer
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* handler, but general ioremap can not be used in atomic context, so
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* the fixmap is used instead.
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*
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* This spinlock is used to prevent the fixmap entry from being used
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* simultaneously.
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*/
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static DEFINE_SPINLOCK(ghes_notify_lock_irq);
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static struct gen_pool *ghes_estatus_pool;
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static unsigned long ghes_estatus_pool_size_request;
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static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
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static atomic_t ghes_estatus_cache_alloced;
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static int ghes_panic_timeout __read_mostly = 30;
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static void __iomem *ghes_map(u64 pfn, enum fixed_addresses fixmap_idx)
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{
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phys_addr_t paddr;
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pgprot_t prot;
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paddr = PFN_PHYS(pfn);
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prot = arch_apei_get_mem_attribute(paddr);
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__set_fixmap(fixmap_idx, paddr, prot);
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return (void __iomem *) __fix_to_virt(fixmap_idx);
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}
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static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
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{
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int _idx = virt_to_fix((unsigned long)vaddr);
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WARN_ON_ONCE(fixmap_idx != _idx);
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clear_fixmap(fixmap_idx);
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}
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int ghes_estatus_pool_init(int num_ghes)
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{
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unsigned long addr, len;
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ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
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if (!ghes_estatus_pool)
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return -ENOMEM;
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len = GHES_ESTATUS_CACHE_AVG_SIZE * GHES_ESTATUS_CACHE_ALLOCED_MAX;
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len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
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ghes_estatus_pool_size_request = PAGE_ALIGN(len);
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addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
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if (!addr)
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return -ENOMEM;
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/*
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* New allocation must be visible in all pgd before it can be found by
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* an NMI allocating from the pool.
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*/
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vmalloc_sync_all();
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return gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
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}
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static int map_gen_v2(struct ghes *ghes)
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{
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return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
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}
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static void unmap_gen_v2(struct ghes *ghes)
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{
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apei_unmap_generic_address(&ghes->generic_v2->read_ack_register);
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}
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static void ghes_ack_error(struct acpi_hest_generic_v2 *gv2)
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{
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int rc;
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u64 val = 0;
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rc = apei_read(&val, &gv2->read_ack_register);
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if (rc)
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return;
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val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
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val |= gv2->read_ack_write << gv2->read_ack_register.bit_offset;
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apei_write(val, &gv2->read_ack_register);
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}
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static struct ghes *ghes_new(struct acpi_hest_generic *generic)
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{
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struct ghes *ghes;
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unsigned int error_block_length;
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int rc;
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ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
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if (!ghes)
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return ERR_PTR(-ENOMEM);
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ghes->generic = generic;
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if (is_hest_type_generic_v2(ghes)) {
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rc = map_gen_v2(ghes);
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if (rc)
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goto err_free;
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}
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rc = apei_map_generic_address(&generic->error_status_address);
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if (rc)
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goto err_unmap_read_ack_addr;
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error_block_length = generic->error_block_length;
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if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
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pr_warning(FW_WARN GHES_PFX
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"Error status block length is too long: %u for "
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"generic hardware error source: %d.\n",
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error_block_length, generic->header.source_id);
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error_block_length = GHES_ESTATUS_MAX_SIZE;
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}
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ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
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if (!ghes->estatus) {
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rc = -ENOMEM;
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goto err_unmap_status_addr;
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}
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return ghes;
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err_unmap_status_addr:
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apei_unmap_generic_address(&generic->error_status_address);
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err_unmap_read_ack_addr:
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if (is_hest_type_generic_v2(ghes))
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unmap_gen_v2(ghes);
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err_free:
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kfree(ghes);
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return ERR_PTR(rc);
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}
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static void ghes_fini(struct ghes *ghes)
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{
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kfree(ghes->estatus);
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apei_unmap_generic_address(&ghes->generic->error_status_address);
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if (is_hest_type_generic_v2(ghes))
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unmap_gen_v2(ghes);
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}
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static inline int ghes_severity(int severity)
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{
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switch (severity) {
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case CPER_SEV_INFORMATIONAL:
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return GHES_SEV_NO;
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case CPER_SEV_CORRECTED:
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return GHES_SEV_CORRECTED;
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case CPER_SEV_RECOVERABLE:
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return GHES_SEV_RECOVERABLE;
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case CPER_SEV_FATAL:
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return GHES_SEV_PANIC;
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default:
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/* Unknown, go panic */
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return GHES_SEV_PANIC;
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}
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}
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static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
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int from_phys,
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enum fixed_addresses fixmap_idx)
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{
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void __iomem *vaddr;
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u64 offset;
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u32 trunk;
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while (len > 0) {
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offset = paddr - (paddr & PAGE_MASK);
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vaddr = ghes_map(PHYS_PFN(paddr), fixmap_idx);
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trunk = PAGE_SIZE - offset;
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trunk = min(trunk, len);
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if (from_phys)
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memcpy_fromio(buffer, vaddr + offset, trunk);
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else
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memcpy_toio(vaddr + offset, buffer, trunk);
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len -= trunk;
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paddr += trunk;
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buffer += trunk;
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ghes_unmap(vaddr, fixmap_idx);
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}
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}
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/* Check the top-level record header has an appropriate size. */
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static int __ghes_check_estatus(struct ghes *ghes,
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struct acpi_hest_generic_status *estatus)
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{
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u32 len = cper_estatus_len(estatus);
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if (len < sizeof(*estatus)) {
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pr_warn_ratelimited(FW_WARN GHES_PFX "Truncated error status block!\n");
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return -EIO;
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}
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if (len > ghes->generic->error_block_length) {
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pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid error status block length!\n");
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return -EIO;
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}
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if (cper_estatus_check_header(estatus)) {
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pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid CPER header!\n");
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return -EIO;
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}
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return 0;
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}
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/* Read the CPER block, returning its address, and header in estatus. */
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static int __ghes_peek_estatus(struct ghes *ghes,
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struct acpi_hest_generic_status *estatus,
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u64 *buf_paddr, enum fixed_addresses fixmap_idx)
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{
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struct acpi_hest_generic *g = ghes->generic;
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int rc;
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rc = apei_read(buf_paddr, &g->error_status_address);
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if (rc) {
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*buf_paddr = 0;
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pr_warn_ratelimited(FW_WARN GHES_PFX
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"Failed to read error status block address for hardware error source: %d.\n",
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g->header.source_id);
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return -EIO;
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}
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if (!*buf_paddr)
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return -ENOENT;
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ghes_copy_tofrom_phys(estatus, *buf_paddr, sizeof(*estatus), 1,
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fixmap_idx);
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if (!estatus->block_status) {
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*buf_paddr = 0;
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return -ENOENT;
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}
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return __ghes_check_estatus(ghes, estatus);
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}
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static int __ghes_read_estatus(struct acpi_hest_generic_status *estatus,
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u64 buf_paddr, enum fixed_addresses fixmap_idx,
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size_t buf_len)
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{
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ghes_copy_tofrom_phys(estatus, buf_paddr, buf_len, 1, fixmap_idx);
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if (cper_estatus_check(estatus)) {
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pr_warn_ratelimited(FW_WARN GHES_PFX
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"Failed to read error status block!\n");
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return -EIO;
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}
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return 0;
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}
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static int ghes_read_estatus(struct ghes *ghes,
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struct acpi_hest_generic_status *estatus,
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u64 *buf_paddr, enum fixed_addresses fixmap_idx)
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{
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int rc;
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rc = __ghes_peek_estatus(ghes, estatus, buf_paddr, fixmap_idx);
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if (rc)
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return rc;
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rc = __ghes_check_estatus(ghes, estatus);
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if (rc)
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return rc;
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return __ghes_read_estatus(estatus, *buf_paddr, fixmap_idx,
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cper_estatus_len(estatus));
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}
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static void ghes_clear_estatus(struct ghes *ghes,
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struct acpi_hest_generic_status *estatus,
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u64 buf_paddr, enum fixed_addresses fixmap_idx)
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{
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estatus->block_status = 0;
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if (!buf_paddr)
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return;
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ghes_copy_tofrom_phys(estatus, buf_paddr,
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sizeof(estatus->block_status), 0,
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fixmap_idx);
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/*
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* GHESv2 type HEST entries introduce support for error acknowledgment,
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* so only acknowledge the error if this support is present.
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*/
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if (is_hest_type_generic_v2(ghes))
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ghes_ack_error(ghes->generic_v2);
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}
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static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int sev)
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{
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#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
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unsigned long pfn;
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int flags = -1;
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int sec_sev = ghes_severity(gdata->error_severity);
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struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
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if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
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return;
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pfn = mem_err->physical_addr >> PAGE_SHIFT;
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if (!pfn_valid(pfn)) {
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pr_warn_ratelimited(FW_WARN GHES_PFX
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"Invalid address in generic error data: %#llx\n",
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mem_err->physical_addr);
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return;
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}
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/* iff following two events can be handled properly by now */
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if (sec_sev == GHES_SEV_CORRECTED &&
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(gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
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flags = MF_SOFT_OFFLINE;
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if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
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flags = 0;
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if (flags != -1)
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memory_failure_queue(pfn, flags);
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#endif
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}
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|
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/*
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* PCIe AER errors need to be sent to the AER driver for reporting and
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* recovery. The GHES severities map to the following AER severities and
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* require the following handling:
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*
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* GHES_SEV_CORRECTABLE -> AER_CORRECTABLE
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* These need to be reported by the AER driver but no recovery is
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* necessary.
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* GHES_SEV_RECOVERABLE -> AER_NONFATAL
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* GHES_SEV_RECOVERABLE && CPER_SEC_RESET -> AER_FATAL
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* These both need to be reported and recovered from by the AER driver.
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* GHES_SEV_PANIC does not make it to this handling since the kernel must
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* panic.
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*/
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static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
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{
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#ifdef CONFIG_ACPI_APEI_PCIEAER
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struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
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if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
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pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
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unsigned int devfn;
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int aer_severity;
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devfn = PCI_DEVFN(pcie_err->device_id.device,
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pcie_err->device_id.function);
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aer_severity = cper_severity_to_aer(gdata->error_severity);
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|
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/*
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* If firmware reset the component to contain
|
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* the error, we must reinitialize it before
|
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* 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 void 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;
|
|
guid_t *fru_id = &NULL_UUID_LE;
|
|
char *fru_text = "";
|
|
|
|
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);
|
|
|
|
ghes_edac_report_mem_error(sev, mem_err);
|
|
|
|
arch_apei_report_mem_error(sev, mem_err);
|
|
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)) {
|
|
struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
|
|
|
|
log_arm_hw_error(err);
|
|
} else {
|
|
void *err = acpi_hest_get_payload(gdata);
|
|
|
|
log_non_standard_event(sec_type, fru_id, fru_text,
|
|
sec_sev, err,
|
|
gdata->error_data_length);
|
|
}
|
|
}
|
|
}
|
|
|
|
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_free(struct ghes_estatus_cache *cache)
|
|
{
|
|
u32 len;
|
|
|
|
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_rcu_free(struct rcu_head *head)
|
|
{
|
|
struct ghes_estatus_cache *cache;
|
|
|
|
cache = container_of(head, struct ghes_estatus_cache, rcu);
|
|
ghes_estatus_cache_free(cache);
|
|
}
|
|
|
|
static void ghes_estatus_cache_add(
|
|
struct acpi_hest_generic *generic,
|
|
struct acpi_hest_generic_status *estatus)
|
|
{
|
|
int i, slot = -1, count;
|
|
unsigned long long now, duration, period, max_period = 0;
|
|
struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
|
|
|
|
new_cache = ghes_estatus_cache_alloc(generic, estatus);
|
|
if (new_cache == NULL)
|
|
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;
|
|
slot_cache = NULL;
|
|
break;
|
|
}
|
|
duration = now - cache->time_in;
|
|
if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
|
|
slot = i;
|
|
slot_cache = cache;
|
|
break;
|
|
}
|
|
count = atomic_read(&cache->count);
|
|
period = duration;
|
|
do_div(period, (count + 1));
|
|
if (period > max_period) {
|
|
max_period = period;
|
|
slot = i;
|
|
slot_cache = cache;
|
|
}
|
|
}
|
|
/* new_cache must be put into array after its contents are written */
|
|
smp_wmb();
|
|
if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
|
|
slot_cache, new_cache) == slot_cache) {
|
|
if (slot_cache)
|
|
call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
|
|
} else
|
|
ghes_estatus_cache_free(new_cache);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
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_warning(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;
|
|
u32 len, node_len;
|
|
|
|
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);
|
|
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);
|
|
}
|
|
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 = 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
|
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static LIST_HEAD(ghes_sea);
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/*
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* Return 0 only if one of the SEA error sources successfully reported an error
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* record sent from the firmware.
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*/
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int ghes_notify_sea(void)
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{
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static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sea);
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int rv;
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raw_spin_lock(&ghes_notify_lock_sea);
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rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
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raw_spin_unlock(&ghes_notify_lock_sea);
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return rv;
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}
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static void ghes_sea_add(struct ghes *ghes)
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{
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mutex_lock(&ghes_list_mutex);
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list_add_rcu(&ghes->list, &ghes_sea);
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mutex_unlock(&ghes_list_mutex);
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}
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static void ghes_sea_remove(struct ghes *ghes)
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{
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mutex_lock(&ghes_list_mutex);
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list_del_rcu(&ghes->list);
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mutex_unlock(&ghes_list_mutex);
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synchronize_rcu();
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}
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#else /* CONFIG_ACPI_APEI_SEA */
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static inline void ghes_sea_add(struct ghes *ghes) { }
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static inline void ghes_sea_remove(struct ghes *ghes) { }
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#endif /* CONFIG_ACPI_APEI_SEA */
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#ifdef CONFIG_HAVE_ACPI_APEI_NMI
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/*
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* NMI may be triggered on any CPU, so ghes_in_nmi is used for
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* having only one concurrent reader.
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*/
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static atomic_t ghes_in_nmi = ATOMIC_INIT(0);
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static LIST_HEAD(ghes_nmi);
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static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
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{
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static DEFINE_RAW_SPINLOCK(ghes_notify_lock_nmi);
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int ret = NMI_DONE;
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if (!atomic_add_unless(&ghes_in_nmi, 1, 1))
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return ret;
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raw_spin_lock(&ghes_notify_lock_nmi);
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if (!ghes_in_nmi_spool_from_list(&ghes_nmi, FIX_APEI_GHES_NMI))
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ret = NMI_HANDLED;
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raw_spin_unlock(&ghes_notify_lock_nmi);
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atomic_dec(&ghes_in_nmi);
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return ret;
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}
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static void ghes_nmi_add(struct ghes *ghes)
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{
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mutex_lock(&ghes_list_mutex);
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if (list_empty(&ghes_nmi))
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register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
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list_add_rcu(&ghes->list, &ghes_nmi);
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mutex_unlock(&ghes_list_mutex);
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}
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static void ghes_nmi_remove(struct ghes *ghes)
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{
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mutex_lock(&ghes_list_mutex);
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list_del_rcu(&ghes->list);
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if (list_empty(&ghes_nmi))
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unregister_nmi_handler(NMI_LOCAL, "ghes");
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mutex_unlock(&ghes_list_mutex);
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/*
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* To synchronize with NMI handler, ghes can only be
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* freed after NMI handler finishes.
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*/
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synchronize_rcu();
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}
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#else /* CONFIG_HAVE_ACPI_APEI_NMI */
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static inline void ghes_nmi_add(struct ghes *ghes) { }
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static inline void ghes_nmi_remove(struct ghes *ghes) { }
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#endif /* CONFIG_HAVE_ACPI_APEI_NMI */
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static void ghes_nmi_init_cxt(void)
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{
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init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
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}
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static int __ghes_sdei_callback(struct ghes *ghes,
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enum fixed_addresses fixmap_idx)
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{
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if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx)) {
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irq_work_queue(&ghes_proc_irq_work);
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return 0;
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}
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return -ENOENT;
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}
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static int ghes_sdei_normal_callback(u32 event_num, struct pt_regs *regs,
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void *arg)
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{
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static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_normal);
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struct ghes *ghes = arg;
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int err;
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raw_spin_lock(&ghes_notify_lock_sdei_normal);
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err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_NORMAL);
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raw_spin_unlock(&ghes_notify_lock_sdei_normal);
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return err;
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}
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static int ghes_sdei_critical_callback(u32 event_num, struct pt_regs *regs,
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void *arg)
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{
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static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_critical);
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struct ghes *ghes = arg;
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int err;
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raw_spin_lock(&ghes_notify_lock_sdei_critical);
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err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_CRITICAL);
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raw_spin_unlock(&ghes_notify_lock_sdei_critical);
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return err;
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}
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static int apei_sdei_register_ghes(struct ghes *ghes)
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{
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if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
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return -EOPNOTSUPP;
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return sdei_register_ghes(ghes, ghes_sdei_normal_callback,
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ghes_sdei_critical_callback);
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}
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static int apei_sdei_unregister_ghes(struct ghes *ghes)
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{
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if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
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return -EOPNOTSUPP;
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return sdei_unregister_ghes(ghes);
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}
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static int ghes_probe(struct platform_device *ghes_dev)
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{
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struct acpi_hest_generic *generic;
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struct ghes *ghes = NULL;
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unsigned long flags;
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int rc = -EINVAL;
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generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
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if (!generic->enabled)
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return -ENODEV;
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switch (generic->notify.type) {
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case ACPI_HEST_NOTIFY_POLLED:
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case ACPI_HEST_NOTIFY_EXTERNAL:
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case ACPI_HEST_NOTIFY_SCI:
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case ACPI_HEST_NOTIFY_GSIV:
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case ACPI_HEST_NOTIFY_GPIO:
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break;
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case ACPI_HEST_NOTIFY_SEA:
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if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
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pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
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generic->header.source_id);
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rc = -ENOTSUPP;
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goto err;
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}
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break;
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case ACPI_HEST_NOTIFY_NMI:
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if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
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pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
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generic->header.source_id);
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goto err;
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}
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break;
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case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
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if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE)) {
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pr_warn(GHES_PFX "Generic hardware error source: %d notified via SDE Interface is not supported!\n",
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generic->header.source_id);
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goto err;
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}
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break;
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case ACPI_HEST_NOTIFY_LOCAL:
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pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
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generic->header.source_id);
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goto err;
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default:
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pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
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generic->notify.type, generic->header.source_id);
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goto err;
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}
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rc = -EIO;
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if (generic->error_block_length <
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sizeof(struct acpi_hest_generic_status)) {
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pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
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generic->error_block_length,
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generic->header.source_id);
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goto err;
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}
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ghes = ghes_new(generic);
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if (IS_ERR(ghes)) {
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rc = PTR_ERR(ghes);
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ghes = NULL;
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goto err;
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}
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switch (generic->notify.type) {
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case ACPI_HEST_NOTIFY_POLLED:
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timer_setup(&ghes->timer, ghes_poll_func, TIMER_DEFERRABLE);
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ghes_add_timer(ghes);
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break;
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case ACPI_HEST_NOTIFY_EXTERNAL:
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/* External interrupt vector is GSI */
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rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
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if (rc) {
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pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
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generic->header.source_id);
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goto err;
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}
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rc = request_irq(ghes->irq, ghes_irq_func, IRQF_SHARED,
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"GHES IRQ", ghes);
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if (rc) {
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pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
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generic->header.source_id);
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goto err;
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}
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break;
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case ACPI_HEST_NOTIFY_SCI:
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case ACPI_HEST_NOTIFY_GSIV:
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case ACPI_HEST_NOTIFY_GPIO:
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mutex_lock(&ghes_list_mutex);
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if (list_empty(&ghes_hed))
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register_acpi_hed_notifier(&ghes_notifier_hed);
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list_add_rcu(&ghes->list, &ghes_hed);
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mutex_unlock(&ghes_list_mutex);
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break;
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case ACPI_HEST_NOTIFY_SEA:
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ghes_sea_add(ghes);
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break;
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case ACPI_HEST_NOTIFY_NMI:
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ghes_nmi_add(ghes);
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break;
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case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
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rc = apei_sdei_register_ghes(ghes);
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if (rc)
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goto err;
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break;
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default:
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BUG();
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}
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platform_set_drvdata(ghes_dev, ghes);
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ghes_edac_register(ghes, &ghes_dev->dev);
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/* Handle any pending errors right away */
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spin_lock_irqsave(&ghes_notify_lock_irq, flags);
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ghes_proc(ghes);
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spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
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return 0;
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err:
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if (ghes) {
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ghes_fini(ghes);
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kfree(ghes);
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}
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return rc;
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}
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static int ghes_remove(struct platform_device *ghes_dev)
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{
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int rc;
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struct ghes *ghes;
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struct acpi_hest_generic *generic;
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ghes = platform_get_drvdata(ghes_dev);
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generic = ghes->generic;
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ghes->flags |= GHES_EXITING;
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switch (generic->notify.type) {
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case ACPI_HEST_NOTIFY_POLLED:
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del_timer_sync(&ghes->timer);
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break;
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case ACPI_HEST_NOTIFY_EXTERNAL:
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free_irq(ghes->irq, ghes);
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break;
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case ACPI_HEST_NOTIFY_SCI:
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case ACPI_HEST_NOTIFY_GSIV:
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case ACPI_HEST_NOTIFY_GPIO:
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mutex_lock(&ghes_list_mutex);
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list_del_rcu(&ghes->list);
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if (list_empty(&ghes_hed))
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unregister_acpi_hed_notifier(&ghes_notifier_hed);
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mutex_unlock(&ghes_list_mutex);
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synchronize_rcu();
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break;
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case ACPI_HEST_NOTIFY_SEA:
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ghes_sea_remove(ghes);
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break;
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case ACPI_HEST_NOTIFY_NMI:
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ghes_nmi_remove(ghes);
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break;
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case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
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rc = apei_sdei_unregister_ghes(ghes);
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if (rc)
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return rc;
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break;
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default:
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BUG();
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break;
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}
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ghes_fini(ghes);
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ghes_edac_unregister(ghes);
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kfree(ghes);
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platform_set_drvdata(ghes_dev, NULL);
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return 0;
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}
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static struct platform_driver ghes_platform_driver = {
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.driver = {
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.name = "GHES",
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},
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.probe = ghes_probe,
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.remove = ghes_remove,
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};
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static int __init ghes_init(void)
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{
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int rc;
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if (acpi_disabled)
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return -ENODEV;
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switch (hest_disable) {
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case HEST_NOT_FOUND:
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return -ENODEV;
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case HEST_DISABLED:
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pr_info(GHES_PFX "HEST is not enabled!\n");
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return -EINVAL;
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default:
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break;
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}
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if (ghes_disable) {
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pr_info(GHES_PFX "GHES is not enabled!\n");
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return -EINVAL;
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}
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ghes_nmi_init_cxt();
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rc = platform_driver_register(&ghes_platform_driver);
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if (rc)
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goto err;
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rc = apei_osc_setup();
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if (rc == 0 && osc_sb_apei_support_acked)
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pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
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else if (rc == 0 && !osc_sb_apei_support_acked)
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pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
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else if (rc && osc_sb_apei_support_acked)
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pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
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else
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pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
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return 0;
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err:
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return rc;
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}
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device_initcall(ghes_init);
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