path: root/drivers/edac/edac_mc.c
diff options
authorMauro Carvalho Chehab <mchehab@redhat.com>2012-02-23 08:10:34 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-06-11 11:55:52 -0300
commit53f2d02898755d1b24bde1975e202815d29fdb81 (patch)
treebf38d5ef64f046c552e94fc4ab360a5f833e1265 /drivers/edac/edac_mc.c
parent0bf09e829dd4b07227ed5a8bc4ac85752a044458 (diff)
RAS: Add a tracepoint for reporting memory controller events
Add a new tracepoint-based hardware events report method for reporting Memory Controller events. Part of the description bellow is shamelessly copied from Tony Luck's notes about the Hardware Error BoF during LPC 2010 [1]. Tony, thanks for your notes and discussions to generate the h/w error reporting requirements. [1] http://lwn.net/Articles/416669/ We have several subsystems & methods for reporting hardware errors: 1) EDAC ("Error Detection and Correction"). In its original form this consisted of a platform specific driver that read topology information and error counts from chipset registers and reported the results via a sysfs interface. 2) mcelog - x86 specific decoding of machine check bank registers reporting in binary form via /dev/mcelog. Recent additions make use of the APEI extensions that were documented in version 4.0a of the ACPI specification to acquire more information about errors without having to rely reading chipset registers directly. A user level programs decodes into somewhat human readable format. 3) drivers/edac/mce_amd.c - this driver hooks into the mcelog path and decodes errors reported via machine check bank registers in AMD processors to the console log using printk(); Each of these mechanisms has a band of followers ... and none of them appear to meet all the needs of all users. As part of a RAS subsystem, let's encapsulate the memory error hardware events into a trace facility. The tracepoint printk will be displayed like: mc_event: [quant] (Corrected|Uncorrected|Fatal) error:[error msg] on [label] ([location] [edac_mc detail] [driver_detail] Where: [quant] is the quantity of errors [error msg] is the driver-specific error message (e. g. "memory read", "bus error", ...); [location] is the location in terms of memory controller and branch/channel/slot, channel/slot or csrow/channel; [label] is the memory stick label; [edac_mc detail] describes the address location of the error and the syndrome; [driver detail] is driver-specifig error message details, when needed/provided (e. g. "area:DMA", ...) For example: mc_event: 1 Corrected error:memory read on memory stick DIMM_1A (mc:0 location:0:0:0 page:0x586b6e offset:0xa66 grain:32 syndrome:0x0 area:DMA) Of course, any userspace tools meant to handle errors should not parse the above data. They should, instead, use the binary fields provided by the tracepoint, mapping them directly into their Management Information Base. NOTE: The original patch was providing an additional mechanism for MCA-based trace events that also contained MCA error register data. However, as no agreement was reached so far for the MCA-based trace events, for now, let's add events only for memory errors. A latter patch is planned to change the tracepoint, for those types of event. Cc: Aristeu Rozanski <arozansk@redhat.com> Cc: Doug Thompson <norsk5@yahoo.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/edac/edac_mc.c')
1 files changed, 56 insertions, 16 deletions
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 10f375032e96..ce25750a83f9 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -27,12 +27,17 @@
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/edac.h>
+#include <linux/bitops.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/edac.h>
#include "edac_core.h"
#include "edac_module.h"
+#define TRACE_INCLUDE_PATH ../../include/ras
+#include <ras/ras_event.h>
/* lock to memory controller's control array */
static DEFINE_MUTEX(mem_ctls_mutex);
static LIST_HEAD(mc_devices);
@@ -384,6 +389,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
* which will perform kobj unregistration and the actual free
* will occur during the kobject callback operation
return mci;
@@ -902,19 +908,19 @@ static void edac_ce_error(struct mem_ctl_info *mci,
const bool enable_per_layer_report,
const unsigned long page_frame_number,
const unsigned long offset_in_page,
- u32 grain)
+ long grain)
unsigned long remapped_page;
if (edac_mc_get_log_ce()) {
if (other_detail && *other_detail)
edac_mc_printk(mci, KERN_WARNING,
- "CE %s on %s (%s%s - %s)\n",
+ "CE %s on %s (%s %s - %s)\n",
msg, label, location,
detail, other_detail);
edac_mc_printk(mci, KERN_WARNING,
- "CE %s on %s (%s%s)\n",
+ "CE %s on %s (%s %s)\n",
msg, label, location,
@@ -953,12 +959,12 @@ static void edac_ue_error(struct mem_ctl_info *mci,
if (edac_mc_get_log_ue()) {
if (other_detail && *other_detail)
edac_mc_printk(mci, KERN_WARNING,
- "UE %s on %s (%s%s - %s)\n",
+ "UE %s on %s (%s %s - %s)\n",
msg, label, location, detail,
edac_mc_printk(mci, KERN_WARNING,
- "UE %s on %s (%s%s)\n",
+ "UE %s on %s (%s %s)\n",
msg, label, location, detail);
@@ -975,27 +981,50 @@ static void edac_ue_error(struct mem_ctl_info *mci,
#define OTHER_LABEL " or "
+ * edac_mc_handle_error - reports a memory event to userspace
+ *
+ * @type: severity of the error (CE/UE/Fatal)
+ * @mci: a struct mem_ctl_info pointer
+ * @page_frame_number: mem page where the error occurred
+ * @offset_in_page: offset of the error inside the page
+ * @syndrome: ECC syndrome
+ * @top_layer: Memory layer[0] position
+ * @mid_layer: Memory layer[1] position
+ * @low_layer: Memory layer[2] position
+ * @msg: Message meaningful to the end users that
+ * explains the event
+ * @other_detail: Technical details about the event that
+ * may help hardware manufacturers and
+ * EDAC developers to analyse the event
+ * @arch_log: Architecture-specific struct that can
+ * be used to add extended information to the
+ * tracepoint, like dumping MCE registers.
+ */
void edac_mc_handle_error(const enum hw_event_mc_err_type type,
struct mem_ctl_info *mci,
const unsigned long page_frame_number,
const unsigned long offset_in_page,
const unsigned long syndrome,
- const int layer0,
- const int layer1,
- const int layer2,
+ const int top_layer,
+ const int mid_layer,
+ const int low_layer,
const char *msg,
const char *other_detail,
- const void *mcelog)
+ const void *arch_log)
/* FIXME: too much for stack: move it to some pre-alocated area */
char detail[80], location[80];
char label[(EDAC_MC_LABEL_LEN + 1 + sizeof(OTHER_LABEL)) * mci->tot_dimms];
char *p;
int row = -1, chan = -1;
- int pos[EDAC_MAX_LAYERS] = { layer0, layer1, layer2 };
+ int pos[EDAC_MAX_LAYERS] = { top_layer, mid_layer, low_layer };
int i;
- u32 grain;
+ long grain;
bool enable_per_layer_report = false;
+ u16 error_count; /* FIXME: make it a parameter */
+ u8 grain_bits;
debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
@@ -1045,11 +1074,11 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
for (i = 0; i < mci->tot_dimms; i++) {
struct dimm_info *dimm = &mci->dimms[i];
- if (layer0 >= 0 && layer0 != dimm->location[0])
+ if (top_layer >= 0 && top_layer != dimm->location[0])
- if (layer1 >= 0 && layer1 != dimm->location[1])
+ if (mid_layer >= 0 && mid_layer != dimm->location[1])
- if (layer2 >= 0 && layer2 != dimm->location[2])
+ if (low_layer >= 0 && low_layer != dimm->location[2])
/* get the max grain, over the error match range */
@@ -1120,11 +1149,22 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
+ if (p > location)
+ *(p - 1) = '\0';
+ /* Report the error via the trace interface */
+ error_count = 1; /* FIXME: allow change it */
+ grain_bits = fls_long(grain) + 1;
+ trace_mc_event(type, msg, label, error_count,
+ mci->mc_idx, top_layer, mid_layer, low_layer,
+ PAGES_TO_MiB(page_frame_number) | offset_in_page,
+ grain_bits, syndrome, other_detail);
/* Memory type dependent details about the error */
snprintf(detail, sizeof(detail),
- "page:0x%lx offset:0x%lx grain:%d syndrome:0x%lx",
+ "page:0x%lx offset:0x%lx grain:%ld syndrome:0x%lx",
page_frame_number, offset_in_page,
grain, syndrome);
edac_ce_error(mci, pos, msg, location, label, detail,
@@ -1132,7 +1172,7 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
page_frame_number, offset_in_page, grain);
} else {
snprintf(detail, sizeof(detail),
- "page:0x%lx offset:0x%lx grain:%d",
+ "page:0x%lx offset:0x%lx grain:%ld",
page_frame_number, offset_in_page, grain);
edac_ue_error(mci, pos, msg, location, label, detail,

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