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Date: Wed, 1 Mar 2017 12:22:40 -0700
From: "Baicar, Tyler" <tbaicar@...eaurora.org>
To: Xie XiuQi <xiexiuqi@...wei.com>, christoffer.dall@...aro.org,
marc.zyngier@....com, pbonzini@...hat.com, rkrcmar@...hat.com,
linux@...linux.org.uk, catalin.marinas@....com,
will.deacon@....com, rjw@...ysocki.net, lenb@...nel.org,
matt@...eblueprint.co.uk, robert.moore@...el.com,
lv.zheng@...el.com, nkaje@...eaurora.org, zjzhang@...eaurora.org,
mark.rutland@....com, james.morse@....com,
akpm@...ux-foundation.org, eun.taik.lee@...sung.com,
sandeepa.s.prabhu@...il.com, labbott@...hat.com,
shijie.huang@....com, rruigrok@...eaurora.org,
paul.gortmaker@...driver.com, tn@...ihalf.com, fu.wei@...aro.org,
rostedt@...dmis.org, bristot@...hat.com,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, linux-efi@...r.kernel.org,
devel@...ica.org, Suzuki.Poulose@....com, punit.agrawal@....com,
astone@...hat.com, harba@...eaurora.org, hanjun.guo@...aro.org,
john.garry@...wei.com, shiju.jose@...wei.com, joe@...ches.com
Subject: Re: [PATCH V11 05/10] acpi: apei: handle SEA notification type for
ARMv8
Hello Xie XiuQi,
On 3/1/2017 12:42 AM, Xie XiuQi wrote:
> Hi Tyler,
>
> On 2017/2/22 5:21, Tyler Baicar wrote:
>> 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.
> I have a question about ghes_proc. In ghes_proc, we just parse and report
> the error information, but no one use it for error recovery now.
>
> Take the SEA case for example, we get the physical address from parsing
> the GHES table. But the memory management system or other drivers/modules
> know what the really meaning of the error address/page. There is no way to
> notify them to do the recovery now.
>
> So, could we add a notify at appropriate position. All drivers or modules
> which are interested in this error could receive and take the corresponding
> action.
Error recovery is outside the scope of these patches. These patches are
supposed to setup the infrastructure to parse/report the SEAs. Error
recovery can be added after the fact which is what has been done for
platform memory errors; the page off-lining support was added after the
error parsing/reporting code was in.
Thanks,
Tyler
>
>> 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@...eaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
>> ---
>> arch/arm64/Kconfig | 1 +
>> arch/arm64/mm/fault.c | 13 ++++++++
>> drivers/acpi/apei/Kconfig | 15 +++++++++
>> drivers/acpi/apei/ghes.c | 77 +++++++++++++++++++++++++++++++++++++++++++----
>> include/acpi/ghes.h | 7 +++++
>> 5 files changed, 107 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 1117421..fca4dc1 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -88,6 +88,7 @@ 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
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index d178dc0..b2d57fc 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -41,6 +41,8 @@
>> #include <asm/pgtable.h>
>> #include <asm/tlbflush.h>
>>
>> +#include <acpi/ghes.h>
>> +
>> static const char *fault_name(unsigned int esr);
>>
>> #ifdef CONFIG_KPROBES
>> @@ -498,6 +500,17 @@ 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",
>> fault_name(esr), 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(ACPI_APEI_SEA)) {
>> + nmi_enter();
>> + ghes_notify_sea();
>> + nmi_exit();
>> + }
>> +
>> info.si_signo = SIGBUS;
>> info.si_errno = 0;
>> info.si_code = 0;
>> diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
>> index b0140c8..c545dd1 100644
>> --- a/drivers/acpi/apei/Kconfig
>> +++ b/drivers/acpi/apei/Kconfig
>> @@ -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 && 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
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index b25e7cf..b0596ba 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -114,11 +114,7 @@
>> * 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)
>>
>> @@ -157,10 +153,14 @@ 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;
>> }
>> @@ -767,6 +767,50 @@ static int ghes_notify_sci(struct notifier_block *this,
>> .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
>> @@ -1012,6 +1056,14 @@ 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",
>> @@ -1023,6 +1075,13 @@ static int ghes_probe(struct platform_device *ghes_dev)
>> pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
>> generic->header.source_id);
>> goto err;
>> + case ACPI_HEST_NOTIFY_GPIO:
>> + case ACPI_HEST_NOTIFY_SEI:
>> + case ACPI_HEST_NOTIFY_GSIV:
>> + pr_warn(GHES_PFX "Generic hardware error source: %d notified via notification type %u is not supported\n",
>> + generic->header.source_id, generic->header.source_id);
>> + rc = -ENOTSUPP;
>> + goto err;
>> default:
>> pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
>> generic->notify.type, generic->header.source_id);
>> @@ -1077,6 +1136,9 @@ 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;
>> @@ -1119,6 +1181,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
>> unregister_acpi_hed_notifier(&ghes_notifier_sci);
>> mutex_unlock(&ghes_list_mutex);
>> break;
>> + case ACPI_HEST_NOTIFY_SEA:
>> + ghes_sea_remove(ghes);
>> + break;
>> case ACPI_HEST_NOTIFY_NMI:
>> ghes_nmi_remove(ghes);
>> break;
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 6ae318b..18bc935 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -1,3 +1,6 @@
>> +#ifndef GHES_H
>> +#define GHES_H
>> +
>> #include <acpi/apei.h>
>> #include <acpi/hed.h>
>>
>> @@ -95,3 +98,7 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>> (void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
>> gdata + 1;
>> }
>> +
>> +void ghes_notify_sea(void);
>> +
>> +#endif /* GHES_H */
>>
--
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