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acpi: apei: handle SEA notification type for ARMv8 

ARM APEI extension proposal added SEA (Synchronous External Abort)
notification type for ARMv8.
Add a new GHES error source handling function for SEA. If an error
source's notification type is SEA, then this function can be registered
into the SEA exception handler. That way GHES will parse and report
SEA exceptions when they occur.
An SEA can interrupt code that had interrupts masked and is treated as
an NMI. To aid this the page of address space for mapping APEI buffers
while in_nmi() is always reserved, and ghes_ioremap_pfn_nmi() is
changed to use the helper methods to find the prot_t to map with in
the same way as ghes_ioremap_pfn_irq().

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Tyler Baicar 2017-06-21 12:17:09 -06:00 committed by Will Deacon
parent 32015c2356
commit 7edda0886b
5 changed files with 105 additions and 6 deletions
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2
arch/arm64/Kconfig
View File

@ -19,6 +19,7 @@ config ARM64
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_STRICT_MODULE_RWX
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_NMI_SAFE_CMPXCHG if ACPI_APEI_SEA
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_NUMA_BALANCING
@ -92,6 +93,7 @@ config ARM64
select HAVE_IRQ_TIME_ACCOUNTING
select HAVE_MEMBLOCK
select HAVE_MEMBLOCK_NODE_MAP if NUMA
select HAVE_NMI if ACPI_APEI_SEA
select HAVE_PATA_PLATFORM
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS

17
arch/arm64/mm/fault.c
View File

@ -42,6 +42,8 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <acpi/ghes.h>
struct fault_info {
int (*fn)(unsigned long addr, unsigned int esr,
struct pt_regs *regs);
@ -535,6 +537,21 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
inf->name, esr, addr);
/*
* Synchronous aborts may interrupt code which had interrupts masked.
* Before calling out into the wider kernel tell the interested
* subsystems.
*/
if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
if (interrupts_enabled(regs))
nmi_enter();
ghes_notify_sea();
if (interrupts_enabled(regs))
nmi_exit();
}
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = 0;

15
drivers/acpi/apei/Kconfig
View File

@ -39,6 +39,21 @@ config ACPI_APEI_PCIEAER
PCIe AER errors may be reported via APEI firmware first mode.
Turn on this option to enable the corresponding support.
config ACPI_APEI_SEA
bool "APEI Synchronous External Abort logging/recovering support"
depends on ARM64 && ACPI_APEI_GHES
default y
help
This option should be enabled if the system supports
firmware first handling of SEA (Synchronous External Abort).
SEA happens with certain faults of data abort or instruction
abort synchronous exceptions on ARMv8 systems. If a system
supports firmware first handling of SEA, the platform analyzes
and handles hardware error notifications from SEA, and it may then
form a HW error record for the OS to parse and handle. This
option allows the OS to look for such hardware error record, and
take appropriate action.
config ACPI_APEI_MEMORY_FAILURE
bool "APEI memory error recovering support"
depends on ACPI_APEI && MEMORY_FAILURE

70
drivers/acpi/apei/ghes.c
View File

@ -116,11 +116,7 @@ static DEFINE_MUTEX(ghes_list_mutex);
* Two virtual pages are used, one for IRQ/PROCESS context, the other for
* NMI context (optionally).
*/
#ifdef CONFIG_HAVE_ACPI_APEI_NMI
#define GHES_IOREMAP_PAGES 2
#else
#define GHES_IOREMAP_PAGES 1
#endif
#define GHES_IOREMAP_IRQ_PAGE(base) (base)
#define GHES_IOREMAP_NMI_PAGE(base) ((base) + PAGE_SIZE)
@ -159,10 +155,14 @@ static void ghes_ioremap_exit(void)
static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
{
unsigned long vaddr;
phys_addr_t paddr;
pgprot_t prot;
vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
pfn << PAGE_SHIFT, PAGE_KERNEL);
paddr = pfn << PAGE_SHIFT;
prot = arch_apei_get_mem_attribute(paddr);
ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
return (void __iomem *)vaddr;
}
@ -774,6 +774,50 @@ static struct notifier_block ghes_notifier_sci = {
.notifier_call = ghes_notify_sci,
};
#ifdef CONFIG_ACPI_APEI_SEA
static LIST_HEAD(ghes_sea);
void ghes_notify_sea(void)
{
struct ghes *ghes;
/*
* synchronize_rcu() will wait for nmi_exit(), so no need to
* rcu_read_lock().
*/
list_for_each_entry_rcu(ghes, &ghes_sea, list) {
ghes_proc(ghes);
}
}
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)
{
pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not supported\n",
ghes->generic->header.source_id);
}
static inline void ghes_sea_remove(struct ghes *ghes)
{
pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not supported\n",
ghes->generic->header.source_id);
}
#endif /* CONFIG_ACPI_APEI_SEA */
#ifdef CONFIG_HAVE_ACPI_APEI_NMI
/*
* printk is not safe in NMI context. So in NMI handler, we allocate
@ -1019,6 +1063,14 @@ static int ghes_probe(struct platform_device *ghes_dev)
case ACPI_HEST_NOTIFY_EXTERNAL:
case ACPI_HEST_NOTIFY_SCI:
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",
@ -1083,6 +1135,9 @@ static int ghes_probe(struct platform_device *ghes_dev)
list_add_rcu(&ghes->list, &ghes_sci);
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;
@ -1126,6 +1181,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
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;

7
include/acpi/ghes.h
View File

@ -1,3 +1,6 @@
#ifndef GHES_H
#define GHES_H
#include <acpi/apei.h>
#include <acpi/hed.h>
@ -109,3 +112,7 @@ static inline void *acpi_hest_get_next(struct acpi_hest_generic_data *gdata)
{
return (void *)(gdata) + acpi_hest_get_record_size(gdata);
}
void ghes_notify_sea(void);
#endif /* GHES_H */