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| author | Borislav Petkov <bp@suse.de> | 2014-11-22 11:22:35 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2014-11-25 13:09:37 +0100 |
| commit | 21690934d93408bb7247943f886b960cf30ecd19 (patch) | |
| tree | 45219ea03c3ef132b3dfda4ec9002d4a3e85d1b2 /drivers/edac | |
| parent | fd19fcd6324d29c97ba69ac3433e392989af401c (diff) | |
| download | linux-stable-21690934d93408bb7247943f886b960cf30ecd19.tar.gz linux-stable-21690934d93408bb7247943f886b960cf30ecd19.tar.bz2 linux-stable-21690934d93408bb7247943f886b960cf30ecd19.zip | |
EDAC, mce_amd_inj: Enable direct writes to MCE MSRs
Normally, writing those causes a #GP but HWCR[McStatusWrEn] controls
that. Provide a knob.
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers/edac')
| -rw-r--r-- | drivers/edac/mce_amd_inj.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c index 9b5023d6f553..9b5ca92737a2 100644 --- a/drivers/edac/mce_amd_inj.c +++ b/drivers/edac/mce_amd_inj.c @@ -55,6 +55,30 @@ 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"); /* + * Caller needs to be make sure this cpu doesn't disappear + * from under us, i.e.: get_cpu/put_cpu. + */ +static int toggle_hw_mce_inject(unsigned int cpu, bool enable) +{ + u32 l, h; + int err; + + err = rdmsr_on_cpu(cpu, MSR_K7_HWCR, &l, &h); + if (err) { + pr_err("%s: error reading HWCR\n", __func__); + return err; + } + + enable ? (l |= BIT(18)) : (l &= ~BIT(18)); + + err = wrmsr_on_cpu(cpu, MSR_K7_HWCR, l, h); + if (err) + pr_err("%s: error writing HWCR\n", __func__); + + return err; +} + +/* * This denotes into which bank we're injecting and triggers * the injection, at the same time. */ |