Re: [PATCH 4/4] EDAC: Convert AMD EDAC pieces to use RAS printk buffer

Borislav Petkov
2012-03-05T11:05:05Z

On Fri, Mar 02, 2012 at 11:52:59AM -0300, Mauro Carvalho Chehab wrote:

[..]

> - the "ras_agent" helper functions is used only for amd64_edac. There's
> no reason for use it elsewhere;

[..]

That can be fixed very easily with the patch below ontop of the current
series (I'll add a proper version of it to the series later). This way,
one does ras_printk() and builds up the message and then, when its done,
calls into the tracepoint like this:

trace_mce_record(ras_get_decoded_err(), m);

where m is struct mce.

The result is:

[Hardware Error]: CPU:0 MC4_STATUS[-|UE|-|PCC|AddrV|UECC]: 0xb607a10009080a23 MC4_ADDR: 0x0000000955647380
[Hardware Error]: Northbridge Error (node 0): DRAM ECC error detected on the NB.
[Hardware Error]: EDAC MC2: UE page 0x955647, offset 0x380, grain 0, row 2, labels ":": amd64_edac

^^^ This line comes from the respective edac driver.

[Hardware Error]: cache level: L3/GEN, mem/io: MEM, mem-tx: WR, part-proc: RES (no timeout)
[Hardware Error]: CPU: 0, MCGc/s: 0/0, MC4: b607a10009080a23, ADDR/MISC: 0000000955647380/dead57ac1ba0babe, RIP: 00:<0000000000000000>, TSC: 0, TIME: 0, SOCKET: 0

> non MCA drivers should also generate tracepoints;

yes, they should define a tracepoint which fits the hardware error
reporting scheme they're using.

--
diff --git a/arch/x86/include/asm/ras.h b/arch/x86/include/asm/ras.h
index 92199af2ab7b..b51838514259 100644
--- a/arch/x86/include/asm/ras.h
+++ b/arch/x86/include/asm/ras.h
@@ -6,8 +6,8 @@
extern bool ras_agent;

#define PR_EMERG BIT(0)
-#define PR_WARNING BIT(1)
-#define PR_CONT BIT(2)
+#define PR_WARNING BIT(4)
+#define PR_CONT BIT(8)

extern const char *ras_get_decoded_err(void);
extern void ras_printk(unsigned long flags, const char *fmt, ...);
diff --git a/arch/x86/ras/ras.c b/arch/x86/ras/ras.c
index 5edfe30034d3..868d732c6cd4 100644
--- a/arch/x86/ras/ras.c
+++ b/arch/x86/ras/ras.c
@@ -52,7 +52,7 @@ void ras_printk(unsigned long flags, const char *fmt, ...)
if (!ras_agent) {
if (flags & PR_EMERG)
pr_emerg("%s", buf);
- if (flags & PR_WARNING)
+ else if (flags & PR_WARNING)
pr_warning("%s", buf);
else if (flags & PR_CONT)
pr_cont("%s", buf);
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 29e153c57e33..c0f31f953c70 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1902,10 +1902,7 @@ static void amd64_handle_ce(struct mem_ctl_info *mci, struct mce *m)
sys_addr = get_error_address(m);
syndrome = extract_syndrome(m->status);

- if (ras_agent)
- ras_printk(PR_EMERG, "ERR_ADDR: 0x%llx", sys_addr);
- else
- amd64_mc_err(mci, "CE ERROR_ADDRESS= 0x%llx\n", sys_addr);
+ amd64_mc_err(mci, "CE ERROR_ADDRESS= 0x%llx\n", sys_addr);

pvt->ops->map_sysaddr_to_csrow(mci, sys_addr, syndrome);
}
diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
index e48ab3108ad8..62a32b3fa660 100644
--- a/drivers/edac/edac_core.h
+++ b/drivers/edac/edac_core.h
@@ -49,8 +49,17 @@
#define edac_printk(level, prefix, fmt, arg...) \
printk(level "EDAC " prefix ": " fmt, ##arg)

-#define edac_mc_printk(mci, level, fmt, arg...) \
- printk(level "EDAC MC%d: " fmt, mci->mc_idx, ##arg)
+#define edac_mc_printk(mci, level, fmt, arg...) \
+({ \
+ if (ras_agent) { \
+ unsigned pr_lvl = BIT((unsigned)(level[1] - '0')); \
+ \
+ ras_printk(pr_lvl, HW_ERR "EDAC MC%d" fmt, \
+ mci->mc_idx, ##arg); \
+ } \
+ else \
+ printk(level "EDAC MC%d: " fmt, mci->mc_idx, ##arg); \
+})

#define edac_mc_chipset_printk(mci, level, prefix, fmt, arg...) \
printk(level "EDAC " prefix " MC%d: " fmt, mci->mc_idx, ##arg)
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 3b3db477b5d0..446853a303c4 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -703,11 +703,7 @@ void edac_mc_handle_ce(struct mem_ctl_info *mci,
return;
}

- if (edac_mc_get_log_ce()) {
- if (ras_agent)
- ras_printk(PR_CONT, ", row: %d, channel: %d\n",
- row, channel);
- else
+ if (edac_mc_get_log_ce())
/* FIXME - put in DIMM location */
edac_mc_printk(mci, KERN_WARNING,
"CE page 0x%lx, offset 0x%lx, grain %d,"
@@ -718,7 +714,6 @@ void edac_mc_handle_ce(struct mem_ctl_info *mci,
row, channel,
mci->csrows[row].channels[channel].label,
msg);
- }

mci->ce_count++;
mci->csrows[row].ce_count++;
@@ -790,16 +785,12 @@ void edac_mc_handle_ue(struct mem_ctl_info *mci,
pos += chars;
}

- if (edac_mc_get_log_ue()) {
- if (ras_agent)
- ras_printk(PR_CONT, "row: %d\n", row);
- else
+ if (edac_mc_get_log_ue())
edac_mc_printk(mci, KERN_EMERG,
"UE page 0x%lx, offset 0x%lx, grain %d,"
" row %d, labels \"%s\": %s\n",
page_frame_number, offset_in_page,
mci->csrows[row].grain, row, labels, msg);
- }

if (edac_mc_get_panic_on_ue())
panic("EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, "

--
Regards/Gruss,
Boris.

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