perf/x86/rapl: Use CPUID bit on AMD and Hygon parts

AMD and Hygon CPUs have a CPUID bit for RAPL.  Drop the fam17h suffix as
it is stale already.

Make use of this instead of a model check to work more nicely in virtual
environments where RAPL typically isn't available.

 [ bp: drop the ../cpu/powerflags.c hunk which is superfluous as the
   "rapl" bit name appears already in flags. ]

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210514135920.16093-1-andrew.cooper3@citrix.com

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index 84a1042..85feafa 100644 (file)
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -764,13 +764,14 @@ static struct rapl_model model_spr = {
        .rapl_msrs      = intel_rapl_spr_msrs,
 };
 
-static struct rapl_model model_amd_fam17h = {
+static struct rapl_model model_amd_hygon = {
        .events         = BIT(PERF_RAPL_PKG),
        .msr_power_unit = MSR_AMD_RAPL_POWER_UNIT,
        .rapl_msrs      = amd_rapl_msrs,
 };
 
 static const struct x86_cpu_id rapl_model_match[] __initconst = {
+       X86_MATCH_FEATURE(X86_FEATURE_RAPL,             &model_amd_hygon),
        X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE,         &model_snb),
        X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X,       &model_snbep),
        X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE,           &model_snb),
@@ -803,9 +804,6 @@ static const struct x86_cpu_id rapl_model_match[] __initconst = {
        X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE,           &model_skl),
        X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L,         &model_skl),
        X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X,    &model_spr),
-       X86_MATCH_VENDOR_FAM(AMD,       0x17,           &model_amd_fam17h),
-       X86_MATCH_VENDOR_FAM(HYGON,     0x18,           &model_amd_fam17h),
-       X86_MATCH_VENDOR_FAM(AMD,       0x19,           &model_amd_fam17h),
        {},
 };
 MODULE_DEVICE_TABLE(x86cpu, rapl_model_match);

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index ac37830..81269c7 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -108,7 +108,7 @@
 #define X86_FEATURE_EXTD_APICID                ( 3*32+26) /* Extended APICID (8 bits) */
 #define X86_FEATURE_AMD_DCM            ( 3*32+27) /* AMD multi-node processor */
 #define X86_FEATURE_APERFMPERF         ( 3*32+28) /* P-State hardware coordination feedback capability (APERF/MPERF MSRs) */
-/* free                                        ( 3*32+29) */
+#define X86_FEATURE_RAPL               ( 3*32+29) /* AMD/Hygon RAPL interface */
 #define X86_FEATURE_NONSTOP_TSC_S3     ( 3*32+30) /* TSC doesn't stop in S3 state */
 #define X86_FEATURE_TSC_KNOWN_FREQ     ( 3*32+31) /* TSC has known frequency */
 

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 2d11384..da57b96 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -646,6 +646,10 @@ static void early_init_amd(struct cpuinfo_x86 *c)
        if (c->x86_power & BIT(12))
                set_cpu_cap(c, X86_FEATURE_ACC_POWER);
 
+       /* Bit 14 indicates the Runtime Average Power Limit interface. */
+       if (c->x86_power & BIT(14))
+               set_cpu_cap(c, X86_FEATURE_RAPL);
+
 #ifdef CONFIG_X86_64
        set_cpu_cap(c, X86_FEATURE_SYSCALL32);
 #else

diff --git a/arch/x86/kernel/cpu/hygon.c b/arch/x86/kernel/cpu/hygon.c
index 0bd6c74..6d50136 100644 (file)
--- a/arch/x86/kernel/cpu/hygon.c
+++ b/arch/x86/kernel/cpu/hygon.c
@@ -260,6 +260,10 @@ static void early_init_hygon(struct cpuinfo_x86 *c)
        if (c->x86_power & BIT(12))
                set_cpu_cap(c, X86_FEATURE_ACC_POWER);
 
+       /* Bit 14 indicates the Runtime Average Power Limit interface. */
+       if (c->x86_power & BIT(14))
+               set_cpu_cap(c, X86_FEATURE_RAPL);
+
 #ifdef CONFIG_X86_64
        set_cpu_cap(c, X86_FEATURE_SYSCALL32);
 #endif