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Commit bad744b7 authored by Yazen Ghannam's avatar Yazen Ghannam Committed by Thomas Gleixner
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x86/RAS: Add syndrome support to mce_amd_inj 



Add a debugfs file which holds the error syndrome (written into
MCA_SYND) of an injected error. Only write it on SMCA systems. Update
README file, while at it.

Signed-off-by: default avatarYazen Ghannam <Yazen.Ghannam@amd.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1467633035-32080-3-git-send-email-Yazen.Ghannam@amd.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent b300e873

arch/x86/ras/mce_amd_inj.c

+11 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ static int inj_##reg##_set(void *data, u64 val) \ 
MCE_INJECT_SET(status);

MCE_INJECT_SET(misc);

MCE_INJECT_SET(addr);

MCE_INJECT_SET(synd);



#define MCE_INJECT_GET(reg)						\

static int inj_##reg##_get(void *data, u64 *val)			\
@@ -81,10 +82,12 @@ static int inj_##reg##_get(void *data, u64 *val) \ 
MCE_INJECT_GET(status);

MCE_INJECT_GET(misc);

MCE_INJECT_GET(addr);

MCE_INJECT_GET(synd);



DEFINE_SIMPLE_ATTRIBUTE(status_fops, inj_status_get, inj_status_set, "%llx\n");

DEFINE_SIMPLE_ATTRIBUTE(misc_fops, inj_misc_get, inj_misc_set, "%llx\n");

DEFINE_SIMPLE_ATTRIBUTE(addr_fops, inj_addr_get, inj_addr_set, "%llx\n");

DEFINE_SIMPLE_ATTRIBUTE(synd_fops, inj_synd_get, inj_synd_set, "%llx\n");



/*

 * Caller needs to be make sure this cpu doesn't disappear
@@ -258,6 +261,7 @@ static void prepare_msrs(void *info) 
		}



		wrmsrl(MSR_AMD64_SMCA_MCx_MISC(b), i_mce.misc);

		wrmsrl(MSR_AMD64_SMCA_MCx_SYND(b), i_mce.synd);

	} else {

		wrmsrl(MSR_IA32_MCx_STATUS(b), i_mce.status);

		wrmsrl(MSR_IA32_MCx_ADDR(b), i_mce.addr);
@@ -275,6 +279,9 @@ static void do_inject(void) 
	if (i_mce.misc)

		i_mce.status |= MCI_STATUS_MISCV;



	if (i_mce.synd)

		i_mce.status |= MCI_STATUS_SYNDV;



	if (inj_type == SW_INJ) {

		mce_inject_log(&i_mce);

		return;
@@ -371,6 +378,9 @@ static const char readme_msg[] = 
"\t used for error thresholding purposes and its validity is indicated by\n"

"\t MCi_STATUS[MiscV].\n"

"\n"

"synd:\t Set MCi_SYND: provide syndrome info about the error. Only valid on\n"

"\t Scalable MCA systems, and its validity is indicated by MCi_STATUS[SyndV].\n"

"\n"

"addr:\t Error address value to be written to MCi_ADDR. Log address information\n"

"\t associated with the error.\n"

"\n"
@@ -420,6 +430,7 @@ static struct dfs_node { 
	{ .name = "status",	.fops = &status_fops, .perm = S_IRUSR | S_IWUSR },

	{ .name = "misc",	.fops = &misc_fops,   .perm = S_IRUSR | S_IWUSR },

	{ .name = "addr",	.fops = &addr_fops,   .perm = S_IRUSR | S_IWUSR },

	{ .name = "synd",	.fops = &synd_fops,   .perm = S_IRUSR | S_IWUSR },

	{ .name = "bank",	.fops = &bank_fops,   .perm = S_IRUSR | S_IWUSR },

	{ .name = "flags",	.fops = &flags_fops,  .perm = S_IRUSR | S_IWUSR },

	{ .name = "cpu",	.fops = &extcpu_fops, .perm = S_IRUSR | S_IWUSR },