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add turbo mode support

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This commit is contained in:
Stefan Lankes 2016-03-07 10:18:42 +01:00
parent e33c710f56
commit 3f3195aea7
2 changed files with 55 additions and 9 deletions
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9
hermit/arch/x86/include/asm/processor.h
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@ -90,6 +90,7 @@ extern "C" {
// feature list 0x00000006
#define CPU_FEATURE_IDA (1 << 0)
#define CPU_FEATURE_EPB (1 << 3)
#define CPU_FEATURE_HWP (1 << 10)
/*
@ -238,6 +239,14 @@ extern "C" {
#define MSR_MTRRfix4K_F0000 0x0000026e
#define MSR_MTRRfix4K_F8000 0x0000026f
#define MSR_OFFCORE_RSP_0 0x000001a6
#define MSR_OFFCORE_RSP_1 0x000001a7
#define MSR_NHM_TURBO_RATIO_LIMIT 0x000001ad
#define MSR_IVT_TURBO_RATIO_LIMIT 0x000001ae
#define MSR_TURBO_RATIO_LIMIT 0x000001ad
#define MSR_TURBO_RATIO_LIMIT1 0x000001ae
#define MSR_TURBO_RATIO_LIMIT2 0x000001af
// MSR EFER bits
#define EFER_SCE (1 << 0)
#define EFER_LME (1 << 8)

55
hermit/arch/x86/kernel/processor.c
View file

@ -224,20 +224,35 @@ static int get_max_pstate(void)
return (value >> 8) & 0xFF;
}
static int get_turbo_pstate(void)
{
uint64_t value;
int i, ret;
value = rdmsr(MSR_NHM_TURBO_RATIO_LIMIT);
i = get_max_pstate();
ret = (value) & 255;
if (ret < i)
ret = i;
return ret;
}
static uint8_t is_turbo = 0;
static int max_pstate, min_pstate;
static int turbo_pstate;
static void set_max_pstate(void)
static void set_pstate(int pstate)
{
uint64_t v = max_pstate << 8;
if (is_turbo)
uint64_t v = pstate << 8;
if (!is_turbo)
v |= (1ULL << 32);
wrmsr(MSR_IA32_PERF_CTL, v);
}
void dump_pstate(void)
{
kprintf("P-State 0x%x - 0x%x\n", min_pstate, max_pstate);
kprintf("P-State 0x%x - 0x%x, turbo 0x%x\n", min_pstate, max_pstate, turbo_pstate);
kprintf("PERF CTL 0x%llx\n", rdmsr(MSR_IA32_PERF_CTL));
kprintf("PERF STATUS 0x%llx\n", rdmsr(MSR_IA32_PERF_STATUS));
}
@ -270,7 +285,11 @@ static void check_est(uint8_t out)
if (v & MSR_IA32_MISC_ENABLE_TURBO_DISABLE) {
if (out)
kputs("Turbo Mode is disabled\n");
} else is_turbo=1;
} else {
if (out)
kputs("Turbo Mode is enabled\n");
is_turbo=1;
}
cpuid(6, &a, &b, &c, &d);
if (c & CPU_FEATURE_IDA) {
@ -283,9 +302,30 @@ static void check_est(uint8_t out)
kprintf("P-State HWP enabled\n");
}
if (c & CPU_FEATURE_EPB) {
// for maximum performance we have to clear BIAS
wrmsr(MSR_IA32_ENERGY_PERF_BIAS, 0);
if (out)
kprintf("Found Performance and Energy Bias Hint support: 0x%llx\n", rdmsr(MSR_IA32_ENERGY_PERF_BIAS));
}
#if 0
if (out) {
kprintf("CPU features 6: 0x%x, 0x%x, 0x%x, 0x%x\n", a, b, c, d);
kprintf("MSR_PLATFORM_INFO 0x%llx\n", rdmsr(MSR_PLATFORM_INFO));
}
#endif
max_pstate = get_max_pstate();
min_pstate = get_min_pstate();
set_max_pstate();
turbo_pstate = get_turbo_pstate();
// set boot_processor to turbo pstate because
// the boot processor has to handle the LwIP thread
if (out)
set_pstate(turbo_pstate);
else
set_pstate(max_pstate);
if (out)
dump_pstate();
@ -516,9 +556,6 @@ int cpu_detection(void) {
uint64_t msr;
kprintf("IA32_MISC_ENABLE 0x%llx\n", rdmsr(MSR_IA32_MISC_ENABLE));
//kprintf("IA32_FEATURE_CONTROL 0x%llx\n", rdmsr(MSR_IA32_FEATURE_CONTROL));
//kprintf("IA32_ENERGY_PERF_BIAS 0x%llx\n", rdmsr(MSR_IA32_ENERGY_PERF_BIAS));
//kprintf("IA32_PERF_STATUS 0x%llx\n", rdmsr(MSR_IA32_PERF_STATUS));
if (has_pat()) {
msr = rdmsr(MSR_IA32_CR_PAT);