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Merge branch 'pm-cpufreq'

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* pm-cpufreq:
  cpufreq: Makefile: fix compilation for davinci platform
  intel_pstate: Set CPU number before accessing MSRs
  intel_pstate: Update documentation of {max,min}_perf_pct sysfs files
  intel_pstate: don't touch turbo bit if turbo disabled or unavailable.
  intel_pstate: Fix setting VID
This commit is contained in:
Rafael J. Wysocki 2014-07-10 21:04:37 +02:00
commit 2091044299
3 changed files with 28 additions and 16 deletions
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7
Documentation/cpu-freq/intel-pstate.txt
View File

@ -15,10 +15,13 @@ New sysfs files for controlling P state selection have been added to
/sys/devices/system/cpu/intel_pstate/
max_perf_pct: limits the maximum P state that will be requested by
the driver stated as a percentage of the available performance.
the driver stated as a percentage of the available performance. The
available (P states) performance may be reduced by the no_turbo
setting described below.
min_perf_pct: limits the minimum P state that will be requested by
the driver stated as a percentage of the available performance.
the driver stated as a percentage of the max (non-turbo)
performance level.
no_turbo: limits the driver to selecting P states below the turbo
frequency range.

2
drivers/cpufreq/Makefile
View File

@ -49,7 +49,7 @@ obj-$(CONFIG_ARM_BIG_LITTLE_CPUFREQ) += arm_big_little.o
# LITTLE drivers, so that it is probed last.
obj-$(CONFIG_ARM_DT_BL_CPUFREQ) += arm_big_little_dt.o
obj-$(CONFIG_ARCH_DAVINCI_DA850) += davinci-cpufreq.o
obj-$(CONFIG_ARCH_DAVINCI) += davinci-cpufreq.o
obj-$(CONFIG_UX500_SOC_DB8500) += dbx500-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS_CPUFREQ) += exynos-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o

35
drivers/cpufreq/intel_pstate.c
View File

@ -128,6 +128,7 @@ static struct pstate_funcs pstate_funcs;
struct perf_limits {
int no_turbo;
int turbo_disabled;
int max_perf_pct;
int min_perf_pct;
int32_t max_perf;
@ -287,7 +288,10 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
if (ret != 1)
return -EINVAL;
limits.no_turbo = clamp_t(int, input, 0 , 1);
if (limits.turbo_disabled) {
pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
limits.no_turbo = limits.turbo_disabled;
}
return count;
}
@ -357,21 +361,21 @@ static int byt_get_min_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 8) & 0x3F;
return (value >> 8) & 0x7F;
}
static int byt_get_max_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 16) & 0x3F;
return (value >> 16) & 0x7F;
}
static int byt_get_turbo_pstate(void)
{
u64 value;
rdmsrl(BYT_TURBO_RATIOS, value);
return value & 0x3F;
return value & 0x7F;
}
static void byt_set_pstate(struct cpudata *cpudata, int pstate)
@ -381,7 +385,7 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate)
u32 vid;
val = pstate << 8;
if (limits.no_turbo)
if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
vid_fp = cpudata->vid.min + mul_fp(
@ -405,8 +409,8 @@ static void byt_get_vid(struct cpudata *cpudata)
rdmsrl(BYT_VIDS, value);
cpudata->vid.min = int_tofp((value >> 8) & 0x3f);
cpudata->vid.max = int_tofp((value >> 16) & 0x3f);
cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
cpudata->vid.ratio = div_fp(
cpudata->vid.max - cpudata->vid.min,
int_tofp(cpudata->pstate.max_pstate -
@ -448,7 +452,7 @@ static void core_set_pstate(struct cpudata *cpudata, int pstate)
u64 val;
val = pstate << 8;
if (limits.no_turbo)
if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
@ -696,9 +700,8 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
cpu = all_cpu_data[cpunum];
intel_pstate_get_cpu_pstates(cpu);
cpu->cpu = cpunum;
intel_pstate_get_cpu_pstates(cpu);
init_timer_deferrable(&cpu->timer);
cpu->timer.function = intel_pstate_timer_func;
@ -741,7 +744,7 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
limits.min_perf = int_tofp(1);
limits.max_perf_pct = 100;
limits.max_perf = int_tofp(1);
limits.no_turbo = 0;
limits.no_turbo = limits.turbo_disabled;
return 0;
}
limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
@ -784,6 +787,7 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
int rc;
u64 misc_en;
rc = intel_pstate_init_cpu(policy->cpu);
if (rc)
@ -791,8 +795,13 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
cpu = all_cpu_data[policy->cpu];
if (!limits.no_turbo &&
limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
if (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
cpu->pstate.max_pstate == cpu->pstate.turbo_pstate) {
limits.turbo_disabled = 1;
limits.no_turbo = 1;
}
if (limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
else
policy->policy = CPUFREQ_POLICY_POWERSAVE;