Re: [PATCH v2 0/9] Extended H/W error log driver

Chen Gong
2013-10-16T15:21:34Z

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[...]
>
> dmesg output format has been updated based on the suggestion from Boris.
> For trace output format we still need further discussion. In the last
> patch(support trace interface) I have to reserve previous Kconfig format
> because I find once I put trace_event interface in the module, it will
> not work. I will paste another trace patch(it only works when acpi_extlog is
> builtin) for your answer.
> --

I put my bogus trace patch here.

=========================8<==========================

Subject: ACPI / trace: Add trace interface for eMCA driver (bogus patch)

Use trace interface to elaborate all H/W error related
information.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
---
drivers/acpi/Kconfig | 3 +-
drivers/acpi/acpi_extlog.c | 131 ++++++++++++++++++++++++++++++++++++++++++++-
drivers/acpi/apei/cper.c | 13 +++--
include/linux/cper.h | 2 +
include/ras/ras_event.h | 61 +++++++++++++++++++++
5 files changed, 204 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 819c06b..eee0258 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -379,6 +379,7 @@ config ACPI_EXTLOG
help
Enhanced MCA Logging allows firmware to provide additional error
information to system software, synchronous with MCE or CMCI. This
- driver adds support for that functionality.
+ driver adds support for that functionality plus an additional special
+ tracepoint which carries that information to userspace.

endif # ACPI
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index d55b072..108f4ae 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -11,11 +11,19 @@
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/cper.h>
+#include <linux/dmi.h>
#include <linux/ratelimit.h>
#include <asm/mce.h>

#include "apei/apei-internal.h"

+#define CREATE_TRACE_POINTS
+#define TRACE_INCLUDE_PATH ../../include/ras
+#include <ras/ras_event.h>
+
+static char mem_location[LOC_LEN];
+static char dimm_location[LOC_LEN];
+
#define EXT_ELOG_ENTRY_MASK GENMASK_ULL(52, 0) /* elog entry address mask */

#define EXTLOG_DSM_REV 0x0
@@ -44,6 +52,8 @@ struct extlog_l1_head {

static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";

+static const uuid_le invalid_uuid = NULL_UUID_LE;
+
/* L1 table related physical address */
static u64 elog_base;
static size_t elog_size;
@@ -130,9 +140,110 @@ static int print_extlog_rcd(const char *pfx,
return 1;
}

+static void mem_err_location(struct cper_sec_mem_err *mem)
+{
+ char *p;
+ u32 n = 0;
+
+ memset(mem_location, 0, LOC_LEN);
+ p = mem_location;
+ if (mem->validation_bits & CPER_MEM_VALID_NODE)
+ n += sprintf(p + n, " node: %d", mem->node);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_CARD)
+ n += sprintf(p + n, " card: %d", mem->card);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_MODULE)
+ n += sprintf(p + n, " module: %d", mem->module);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
+ n += sprintf(p + n, " rank: %d", mem->rank);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_BANK)
+ n += sprintf(p + n, " bank: %d", mem->bank);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_DEVICE)
+ n += sprintf(p + n, " device: %d", mem->device);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_ROW)
+ n += sprintf(p + n, " row: %d", mem->row);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_COLUMN)
+ n += sprintf(p + n, " column: %d", mem->column);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_BIT_POSITION)
+ n += sprintf(p + n, " bit_position: %d", mem->bit_pos);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_REQUESTOR_ID)
+ n += sprintf(p + n, " requestor_id: 0x%016llx",
+ mem->requestor_id);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_RESPONDER_ID)
+ n += sprintf(p + n, " responder_id: 0x%016llx",
+ mem->responder_id);
+ if (n >= LOC_LEN)
+ goto end;
+ if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID)
+ n += sprintf(p + n, " target_id: 0x%016llx", mem->target_id);
+end:
+ return;
+}
+
+static void dimm_err_location(struct cper_sec_mem_err *mem)
+{
+ const char *bank = NULL, *device = NULL;
+
+ memset(dimm_location, 0, LOC_LEN);
+ if (!(mem->validation_bits & CPER_MEM_VALID_MODULE_HANDLE))
+ return;
+
+ dmi_memdev_name(mem->mem_dev_handle, &bank, &device);
+ if (bank != NULL && device != NULL)
+ snprintf(dimm_location, LOC_LEN - 1, "%s %s", bank, device);
+ else
+ snprintf(dimm_location, LOC_LEN - 1, "DMI handle: 0x%.4x",
+ mem->mem_dev_handle);
+}
+
+static void trace_mem_error(const uuid_le *fru_id, char *fru_text,
+ u64 err_count, u32 severity,
+ struct cper_sec_mem_err *mem)
+{
+ u32 etype = ~0U;
+ u64 phy_addr = 0;
+
+ if (mem->validation_bits & CPER_MEM_VALID_ERROR_TYPE)
+ etype = mem->error_type;
+ if (mem->validation_bits & CPER_MEM_VALID_PA) {
+ phy_addr = mem->physical_addr;
+ if (mem->validation_bits & CPER_MEM_VALID_PA_MASK)
+ phy_addr &= mem->physical_addr_mask;
+ }
+ mem_err_location(mem);
+ dimm_err_location(mem);
+
+ trace_extlog_mem_event(etype, dimm_location, fru_id, fru_text,
+ err_count, severity, phy_addr, mem_location);
+}
+
static int extlog_print(const char *pfx, int cpu, int bank)
{
- struct acpi_generic_status *estatus;
+ struct acpi_generic_status *estatus, *tmp;
+ struct acpi_generic_data *gdata;
+ const uuid_le *fru_id = &invalid_uuid;
+ char *fru_text = "";
+ uuid_le *sec_type;
+ static u64 err_count;
int rc;

estatus = extlog_elog_entry_check(cpu, bank);
@@ -143,7 +254,23 @@ static int extlog_print(const char *pfx, int cpu, int bank)
/* clear record status to enable BIOS to update it again */
estatus->block_status = 0;

- rc = print_extlog_rcd(pfx, (struct acpi_generic_status *)elog_buf, cpu);
+ tmp = (struct acpi_generic_status *)elog_buf;
+ gdata = (struct acpi_generic_data *)(tmp + 1);
+ rc = print_extlog_rcd(pfx, tmp, cpu);
+
+ /* trace extended error log */
+ err_count++;
+ if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
+ fru_id = (uuid_le *)gdata->fru_id;
+ if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
+ fru_text = gdata->fru_text;
+ sec_type = (uuid_le *)gdata->section_type;
+ if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
+ struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
+ if (gdata->error_data_length >= sizeof(*mem_err))
+ trace_mem_error(fru_id, fru_text, err_count,
+ gdata->error_severity, mem_err);
+ }

return rc;
}
diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index f5bc227..44bde6a 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -59,11 +59,12 @@ static const char *cper_severity_strs[] = {
"info",
};

-static const char *cper_severity_str(unsigned int severity)
+const char *cper_severity_str(unsigned int severity)
{
return severity < ARRAY_SIZE(cper_severity_strs) ?
cper_severity_strs[severity] : "unknown";
}
+EXPORT_SYMBOL_GPL(cper_severity_str);

/*
* cper_print_bits - print strings for set bits
@@ -198,6 +199,13 @@ static const char *cper_mem_err_type_strs[] = {
"physical memory map-out event",
};

+const char *cper_mem_err_type_str(unsigned int etype)
+{
+ return etype < ARRAY_SIZE(cper_mem_err_type_strs) ?
+ cper_mem_err_type_strs[etype] : "unknown";
+}
+EXPORT_SYMBOL_GPL(cper_mem_err_type_str);
+
static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
{
if (mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS)
@@ -235,8 +243,7 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
if (mem->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
u8 etype = mem->error_type;
printk("%s""error_type: %d, %s\n", pfx, etype,
- etype < ARRAY_SIZE(cper_mem_err_type_strs) ?
- cper_mem_err_type_strs[etype] : "unknown");
+ cper_mem_err_type_str(etype));
}
if (mem->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
const char *bank = NULL, *device = NULL;
diff --git a/include/linux/cper.h b/include/linux/cper.h
index 2fc0ec3..c6d87fc 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -395,6 +395,8 @@ struct cper_sec_pcie {
#pragma pack()

u64 cper_next_record_id(void);
+const char *cper_severity_str(unsigned int);
+const char *cper_mem_err_type_str(unsigned int);
void cper_print_bits(const char *prefix, unsigned int bits,
const char * const strs[], unsigned int strs_size);

diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 21cdb0b..579dbb0 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -8,6 +8,67 @@
#include <linux/tracepoint.h>
#include <linux/edac.h>
#include <linux/ktime.h>
+#include <linux/cper.h>
+
+/*
+ * MCE Extended Error Log Trace event
+ *
+ * These events are generated when hardware detects a corrected or
+ * uncorrected event.
+ *
+ */
+
+/* memory trace event */
+
+#define LOC_LEN 512
+#define MSG_LEN ((LOC_LEN) * 2)
+
+TRACE_EVENT(extlog_mem_event,
+ TP_PROTO(u32 etype,
+ char *dimm_loc,
+ const uuid_le *fru_id,
+ char *fru_text,
+ u64 error_count,
+ u32 severity,
+ u64 phy_addr,
+ char *mem_loc),
+
+ TP_ARGS(etype, dimm_loc, fru_id, fru_text, error_count, severity,
+ phy_addr, mem_loc),
+
+ TP_STRUCT__entry(
+ __field(u32, etype)
+ __dynamic_array(char, dimm_info, LOC_LEN)
+ __field(u64, error_count)
+ __field(u32, severity)
+ __dynamic_array(char, msg, MSG_LEN)
+ ),
+
+ TP_fast_assign(
+ __entry->error_count = error_count;
+ __entry->severity = severity;
+ __entry->etype = etype;
+ if (dimm_loc[0] != '\0')
+ snprintf(__get_dynamic_array(dimm_info), LOC_LEN - 1,
+ "on %s", dimm_loc);
+ else
+ __assign_str(dimm_info, "");
+ if (phy_addr != 0)
+ snprintf(__get_dynamic_array(msg), MSG_LEN - 1,
+ "(FRU: %pUl %.20s physical addr: 0x%016llx%s)",
+ fru_id, fru_text, phy_addr, mem_loc);
+ else
+ __assign_str(msg, "");
+ ),
+
+ TP_printk("%llu %s error%s: %s %s %s",
+ __entry->error_count,
+ cper_severity_str(__entry->severity),
+ __entry->error_count > 1 ? "s" : "",
+ cper_mem_err_type_str(__entry->etype),
+ __get_str(dimm_info),
+ __get_str(msg))
+);

/*
* Hardware Events Report
--
1.8.4.rc3

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