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Date: Mon, 17 Aug 2020 10:49:29 +0800
From: Xiaofei Tan <tanxiaofei@...wei.com>
To: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<rjw@...ysocki.net>, <lenb@...nel.org>, <james.morse@....com>,
<tony.luck@...el.com>, <bp@...en8.de>
CC: <linuxarm@...wei.com>, <shiju.jose@...wei.com>,
<jonathan.cameron@...wei.com>
Subject: Re: [PATCH v2] ACPI / APEI: do memory failure on the physical address
reported by ARM processor error section
@James, Could you help to check if i have fixed your review comments? thanks.
On 2020/8/5 17:12, Xiaofei Tan wrote:
> After the commit 8fcc4ae6faf8 ("arm64: acpi: Make apei_claim_sea()
> synchronise with APEI's irq work") applied, user-mode SEA is
> preferentially processed by APEI. Do memory failure to recover.
>
> But there are some problems:
> 1) The function apei_claim_sea() has processed an CPER, does not
> mean that memory failure handling has done. Because the firmware-first
> RAS error is reported by both producer and consumer. Mostly SEA uses
> ARM processor error section to report as a consumer. (The producer could
> be DDRC and cache, and use memory error section and other error section
> to report). But memory failure handling for ARM processor error section
> has not been supported. This patch will add it.
>
> 2) Some hardware platforms can't record physical address each time. But
> they could always have reported a firmware-first RAS error using ARM
> processor error section. Such platform should update firmware. Don't
> report the RAS error in SEA processing flow when physical address is
> not recorded.
>
> Signed-off-by: Xiaofei Tan <tanxiaofei@...wei.com>
> ---
> drivers/acpi/apei/ghes.c | 70 ++++++++++++++++++++++++++++++++++++------------
> 1 file changed, 53 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 81bf71b..aee7787 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -429,28 +429,35 @@ static void ghes_kick_task_work(struct callback_head *head)
> gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, node_len);
> }
>
> -static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
> - int sev)
> +static bool ghes_do_memory_failure(u64 physical_addr, int flags)
> {
> unsigned long pfn;
> - int flags = -1;
> - int sec_sev = ghes_severity(gdata->error_severity);
> - struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
>
> if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
> return false;
>
> - if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
> - return false;
> -
> - pfn = mem_err->physical_addr >> PAGE_SHIFT;
> + pfn = PHYS_PFN(physical_addr);
> if (!pfn_valid(pfn)) {
> pr_warn_ratelimited(FW_WARN GHES_PFX
> "Invalid address in generic error data: %#llx\n",
> - mem_err->physical_addr);
> + physical_addr);
> return false;
> }
>
> + memory_failure_queue(pfn, flags);
> + return true;
> +}
> +
> +static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
> + int sev)
> +{
> + int flags = -1;
> + int sec_sev = ghes_severity(gdata->error_severity);
> + struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
> +
> + if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
> + return false;
> +
> /* iff following two events can be handled properly by now */
> if (sec_sev == GHES_SEV_CORRECTED &&
> (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
> @@ -458,14 +465,45 @@ static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
> if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
> flags = 0;
>
> - if (flags != -1) {
> - memory_failure_queue(pfn, flags);
> - return true;
> - }
> + if (flags != -1)
> + return ghes_do_memory_failure(mem_err->physical_addr, flags);
>
> return false;
> }
>
> +static bool ghes_handle_arm_hw_error(struct acpi_hest_generic_data *gdata, int sev)
> +{
> + struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
> + struct cper_arm_err_info *err_info;
> + bool queued = false;
> + int sec_sev, i;
> +
> + log_arm_hw_error(err);
> +
> + sec_sev = ghes_severity(gdata->error_severity);
> + if (sev != GHES_SEV_RECOVERABLE || sec_sev != GHES_SEV_RECOVERABLE)
> + return false;
> +
> + err_info = (struct cper_arm_err_info *) (err + 1);
> + for (i = 0; i < err->err_info_num; i++, err_info++) {
> + if (!(err_info->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR))
> + continue;
> +
> + if (err_info->type != CPER_ARM_CACHE_ERROR) {
> + pr_warn_ratelimited(FW_WARN GHES_PFX
> + "Physical address should be invalid for %s\n",
> + err_info->type < ARRAY_SIZE(cper_proc_error_type_strs) ?
> + cper_proc_error_type_strs[err_info->type] : "unknown error type");
> + continue;
> + }
> +
> + if (ghes_do_memory_failure(err_info->physical_fault_addr, 0))
> + queued = true;
> + }
> +
> + return queued;
> +}
> +
> /*
> * PCIe AER errors need to be sent to the AER driver for reporting and
> * recovery. The GHES severities map to the following AER severities and
> @@ -543,9 +581,7 @@ static bool ghes_do_proc(struct ghes *ghes,
> 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);
> + queued = ghes_handle_arm_hw_error(gdata, sev);
> } else {
> void *err = acpi_hest_get_payload(gdata);
>
>
--
thanks
tanxiaofei
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