Date:   Wed, 5 Aug 2020 17:12:11 +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>, Xiaofei Tan <tanxiaofei@...wei.com>
Subject: [PATCH v2] ACPI / APEI: do memory failure on the physical address reported by ARM processor error section

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);
 
-- 
2.8.1

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