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hwpstate_intel(4): Error check epp sysctl & bail if HW does not support feature

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This commit is contained in:
Conrad Meyer 2020-02-01 19:45:27 +00:00
parent 50214f86c5
commit b80d476c3c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357376
1 changed files with 9 additions and 2 deletions
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11
sys/x86/cpufreq/hwpstate_intel.c
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@ -218,6 +218,7 @@ raw_to_percent(int x)
static int
sysctl_epp_select(SYSCTL_HANDLER_ARGS)
{
struct hwp_softc *sc;
device_t dev;
struct pcpu *pc;
uint64_t requested;
@ -225,6 +226,10 @@ sysctl_epp_select(SYSCTL_HANDLER_ARGS)
int ret;
dev = oidp->oid_arg1;
sc = device_get_softc(dev);
if (!sc->hwp_pref_ctrl)
return (ENODEV);
pc = cpu_get_pcpu(dev);
if (pc == NULL)
return (ENXIO);
@ -233,7 +238,9 @@ sysctl_epp_select(SYSCTL_HANDLER_ARGS)
sched_bind(curthread, pc->pc_cpuid);
thread_unlock(curthread);
rdmsr_safe(MSR_IA32_HWP_REQUEST, &requested);
ret = rdmsr_safe(MSR_IA32_HWP_REQUEST, &requested);
if (ret)
goto out;
val = (requested & IA32_HWP_REQUEST_ENERGY_PERFORMANCE_PREFERENCE) >> 24;
val = raw_to_percent(val);
@ -253,7 +260,7 @@ sysctl_epp_select(SYSCTL_HANDLER_ARGS)
requested &= ~IA32_HWP_REQUEST_ENERGY_PERFORMANCE_PREFERENCE;
requested |= val << 24;
wrmsr_safe(MSR_IA32_HWP_REQUEST, requested);
ret = wrmsr_safe(MSR_IA32_HWP_REQUEST, requested);
out:
thread_lock(curthread);