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: Yazen Ghannam <Yazen.Ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1467633035-32080-3-git-send-email-Yazen.Ghannam@amd.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/ras/mce_amd_inj.c b/arch/x86/ras/mce_amd_inj.c
index 1104515d5ad2aadee8711425e089bce3857b8139..ff8eb1a9ce6d6552fad62224db4139f9d56b0e81 100644 (file)
--- a/arch/x86/ras/mce_amd_inj.c
+++ b/arch/x86/ras/mce_amd_inj.c
@@ -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 },