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Differential D12260 Diff 32786 head/sys/x86/cpufreq/hwpstate.c

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head/sys/x86/cpufreq/hwpstate.c

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DRIVER_MODULE(hwpstate, cpu, hwpstate_driver, hwpstate_devclass, 0, 0); DRIVER_MODULE(hwpstate, cpu, hwpstate_driver, hwpstate_devclass, 0, 0);
/* /*
* Go to Px-state on all cpus considering the limit. * Go to Px-state on all cpus considering the limit.
*/ */
static int static int
hwpstate_goto_pstate(device_t dev, int pstate) hwpstate_goto_pstate(device_t dev, int pstate)
{ {
sbintime_t sbt;
int i; int i;
uint64_t msr; uint64_t msr;
int j; int j;
int limit; int limit;
int id = pstate; int id = pstate;
int error; int error;
/* get the current pstate limit */ /* get the current pstate limit */
msr = rdmsr(MSR_AMD_10H_11H_LIMIT); msr = rdmsr(MSR_AMD_10H_11H_LIMIT);
limit = AMD_10H_11H_GET_PSTATE_LIMIT(msr); limit = AMD_10H_11H_GET_PSTATE_LIMIT(msr);
if(limit > id) if (limit > id)
id = limit; id = limit;
/* /*
* We are going to the same Px-state on all cpus. * We are going to the same Px-state on all cpus.
* Probably should take _PSD into account. * Probably should take _PSD into account.
*/ */
error = 0; error = 0;
CPU_FOREACH(i) { CPU_FOREACH(i) {
/* Bind to each cpu. */ /* Bind to each cpu. */
thread_lock(curthread); thread_lock(curthread);
sched_bind(curthread, i); sched_bind(curthread, i);
thread_unlock(curthread); thread_unlock(curthread);
HWPSTATE_DEBUG(dev, "setting P%d-state on cpu%d\n", HWPSTATE_DEBUG(dev, "setting P%d-state on cpu%d\n",
id, PCPU_GET(cpuid)); id, PCPU_GET(cpuid));
/* Go To Px-state */ /* Go To Px-state */
wrmsr(MSR_AMD_10H_11H_CONTROL, id); wrmsr(MSR_AMD_10H_11H_CONTROL, id);
} }
CPU_FOREACH(i) { CPU_FOREACH(i) {
/* Bind to each cpu. */ /* Bind to each cpu. */
thread_lock(curthread); thread_lock(curthread);
sched_bind(curthread, i); sched_bind(curthread, i);
thread_unlock(curthread); thread_unlock(curthread);
/* wait loop (100*100 usec is enough ?) */ /* wait loop (100*100 usec is enough ?) */
for(j = 0; j < 100; j++){ for (j = 0; j < 100; j++){
/* get the result. not assure msr=id */ /* get the result. not assure msr=id */
msr = rdmsr(MSR_AMD_10H_11H_STATUS); msr = rdmsr(MSR_AMD_10H_11H_STATUS);
if(msr == id){ if (msr == id)
break; break;
} sbt = SBT_1MS / 10;
DELAY(100); tsleep_sbt(dev, PZERO, "pstate_goto", sbt,
sbt >> tc_precexp, 0);
} }
HWPSTATE_DEBUG(dev, "result: P%d-state on cpu%d\n", HWPSTATE_DEBUG(dev, "result: P%d-state on cpu%d\n",
(int)msr, PCPU_GET(cpuid)); (int)msr, PCPU_GET(cpuid));
if (msr != id) { if (msr != id) {
HWPSTATE_DEBUG(dev, "error: loop is not enough.\n"); HWPSTATE_DEBUG(dev, "error: loop is not enough.\n");
error = ENXIO; error = ENXIO;
} }
} }
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