nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

x86/MCE/AMD: Carve out the MC4_MISC thresholding quirk

Browse source 
The MC4_MISC thresholding quirk needs to be applied during S5 -> S0 and
S3 -> S0 state transitions, which follow different code paths. Carve it
out into a separate function and call it mce_amd_feature_init() where
the two code paths of the state transitions converge.

 [ bp: massage commit message and the carved out function. ]

Signed-off-by: Shirish S <shirish.s@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/1547651417-23583-3-git-send-email-shirish.s@amd.com
This commit is contained in:
Shirish S 2019-01-16 15:10:40 +00:00 committed by Borislav Petkov
parent c95b323dcd
commit 30aa3d26ed
2 changed files with 36 additions and 29 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

36
arch/x86/kernel/cpu/mce/amd.c
View file

@ -545,6 +545,40 @@ prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
return offset;
}
/*
* Turn off MC4_MISC thresholding banks on all family 0x15 models since
* they're not supported there.
*/
void disable_err_thresholding(struct cpuinfo_x86 *c)
{
int i;
u64 hwcr;
bool need_toggle;
u32 msrs[] = {
0x00000413, /* MC4_MISC0 */
0xc0000408, /* MC4_MISC1 */
};
if (c->x86 != 0x15)
return;
rdmsrl(MSR_K7_HWCR, hwcr);
/* McStatusWrEn has to be set */
need_toggle = !(hwcr & BIT(18));
if (need_toggle)
wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
/* Clear CntP bit safely */
for (i = 0; i < ARRAY_SIZE(msrs); i++)
msr_clear_bit(msrs[i], 62);
/* restore old settings */
if (need_toggle)
wrmsrl(MSR_K7_HWCR, hwcr);
}
/* cpu init entry point, called from mce.c with preempt off */
void mce_amd_feature_init(struct cpuinfo_x86 *c)
{
@ -552,6 +586,8 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
unsigned int bank, block, cpu = smp_processor_id();
int offset = -1;
disable_err_thresholding(c);
for (bank = 0; bank < mca_cfg.banks; ++bank) {
if (mce_flags.smca)
smca_configure(bank, cpu);

29
arch/x86/kernel/cpu/mce/core.c
View file

@ -1611,35 +1611,6 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
if (c->x86 == 0x15 && c->x86_model <= 0xf)
mce_flags.overflow_recov = 1;
/*
* Turn off MC4_MISC thresholding banks on all models since
* they're not supported there.
*/
if (c->x86 == 0x15) {
int i;
u64 hwcr;
bool need_toggle;
u32 msrs[] = {
0x00000413, /* MC4_MISC0 */
0xc0000408, /* MC4_MISC1 */
};
rdmsrl(MSR_K7_HWCR, hwcr);
/* McStatusWrEn has to be set */
need_toggle = !(hwcr & BIT(18));
if (need_toggle)
wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
/* Clear CntP bit safely */
for (i = 0; i < ARRAY_SIZE(msrs); i++)
msr_clear_bit(msrs[i], 62);
/* restore old settings */
if (need_toggle)
wrmsrl(MSR_K7_HWCR, hwcr);
}
}
if (c->x86_vendor == X86_VENDOR_INTEL) {