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x86: Add/amend some power-management comments/macros

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No functional change.
This commit is contained in:
Conrad Meyer 2020-02-01 19:46:02 +00:00
parent b80d476c3c
commit 5e3574c8cd
3 changed files with 16 additions and 3 deletions
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12
sys/x86/cpufreq/hwpstate_intel.c
View File

@ -329,6 +329,14 @@ set_autonomous_hwp(struct hwp_softc *sc)
/* XXX: Many MSRs aren't readable until feature is enabled */
ret = wrmsr_safe(MSR_IA32_PM_ENABLE, 1);
if (ret) {
/*
* This is actually a package-level MSR, and only the first
* write is not ignored. So it is harmless to enable it across
* all devices, and this allows us not to care especially in
* which order cores (and packages) are probed. This error
* condition should not happen given we gate on the HWP CPUID
* feature flag, if the Intel SDM is correct.
*/
device_printf(dev, "Failed to enable HWP for cpu%d (%d)\n",
pc->pc_cpuid, ret);
goto out;
@ -350,6 +358,10 @@ set_autonomous_hwp(struct hwp_softc *sc)
goto out;
}
/*
* High and low are static; "guaranteed" is dynamic; and efficient is
* also dynamic.
*/
sc->high = IA32_HWP_CAPABILITIES_HIGHEST_PERFORMANCE(caps);
sc->guaranteed = IA32_HWP_CAPABILITIES_GUARANTEED_PERFORMANCE(caps);
sc->efficient = IA32_HWP_CAPABILITIES_EFFICIENT_PERFORMANCE(caps);

1
sys/x86/include/specialreg.h
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@ -566,6 +566,7 @@
#define MSR_IA32_TEMPERATURE_TARGET 0x1a2
#define MSR_TURBO_RATIO_LIMIT 0x1ad
#define MSR_TURBO_RATIO_LIMIT1 0x1ae
#define MSR_IA32_ENERGY_PERF_BIAS 0x1b0
#define MSR_DEBUGCTLMSR 0x1d9
#define MSR_LASTBRANCHFROMIP 0x1db
#define MSR_LASTBRANCHTOIP 0x1dc

6
sys/x86/x86/identcpu.c
View File

@ -119,9 +119,9 @@ u_int cpu_mon_min_size; /* MONITOR minimum range size, bytes */
u_int cpu_mon_max_size; /* MONITOR minimum range size, bytes */
u_int cpu_maxphyaddr; /* Max phys addr width in bits */
u_int cpu_power_eax; /* 06H: Power management leaf, %eax */
u_int cpu_power_ebx; /* 06H: Power management leaf, %eax */
u_int cpu_power_ecx; /* 06H: Power management leaf, %eax */
u_int cpu_power_edx; /* 06H: Power management leaf, %eax */
u_int cpu_power_ebx; /* 06H: Power management leaf, %ebx */
u_int cpu_power_ecx; /* 06H: Power management leaf, %ecx */
u_int cpu_power_edx; /* 06H: Power management leaf, %edx */
char machine[] = MACHINE;
SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD,