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x86/cpufeatures: Carve out CQM features retrieval

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... into a separate function for better readability. Split out from a
patch from Fenghua Yu <[email protected]> to keep the mechanical,
sole code movement separate for easy review.

No functional changes.

Signed-off-by: Borislav Petkov <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: [email protected]
This commit is contained in:
Borislav Petkov committed 2019-06-20 11:23:29 +02:00
1 parent 1b7aebf048
commit 45fc56e629
1 file changed
+33 -27
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arch/x86/kernel/cpu/common.c
+33 -27
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@@ -801,6 +801,38 @@ static void init_speculation_control(struct cpuinfo_x86 *c)
}
}
static void init_cqm(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
/* Additional Intel-defined flags: level 0x0000000F */
if (c->cpuid_level >= 0x0000000F) {
/* QoS sub-leaf, EAX=0Fh, ECX=0 */
cpuid_count(0x0000000F, 0, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_F_0_EDX] = edx;
if (cpu_has(c, X86_FEATURE_CQM_LLC)) {
/* will be overridden if occupancy monitoring exists */
c->x86_cache_max_rmid = ebx;
/* QoS sub-leaf, EAX=0Fh, ECX=1 */
cpuid_count(0x0000000F, 1, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_F_1_EDX] = edx;
if ((cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC)) ||
((cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL)) ||
(cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)))) {
c->x86_cache_max_rmid = ecx;
c->x86_cache_occ_scale = ebx;
}
} else {
c->x86_cache_max_rmid = -1;
c->x86_cache_occ_scale = -1;
}
}
}
void get_cpu_cap(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
@@ -832,33 +864,6 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
c->x86_capability[CPUID_D_1_EAX] = eax;
}
/* Additional Intel-defined flags: level 0x0000000F */
if (c->cpuid_level >= 0x0000000F) {
/* QoS sub-leaf, EAX=0Fh, ECX=0 */
cpuid_count(0x0000000F, 0, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_F_0_EDX] = edx;
if (cpu_has(c, X86_FEATURE_CQM_LLC)) {
/* will be overridden if occupancy monitoring exists */
c->x86_cache_max_rmid = ebx;
/* QoS sub-leaf, EAX=0Fh, ECX=1 */
cpuid_count(0x0000000F, 1, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_F_1_EDX] = edx;
if ((cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC)) ||
((cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL)) ||
(cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)))) {
c->x86_cache_max_rmid = ecx;
c->x86_cache_occ_scale = ebx;
}
} else {
c->x86_cache_max_rmid = -1;
c->x86_cache_occ_scale = -1;
}
}
/* AMD-defined flags: level 0x80000001 */
eax = cpuid_eax(0x80000000);
c->extended_cpuid_level = eax;
@@ -889,6 +894,7 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
init_scattered_cpuid_features(c);
init_speculation_control(c);
init_cqm(c);
/*
* Clear/Set all flags overridden by options, after probe.