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cpufreq: intel_pstate: Fix limits issue with operation mode switching 

There is a problem with intel_pstate operation mode switching
introduced by commit fb1fe1041c (cpufreq: intel_pstate: Operation
mode control from sysfs), because the global sysfs limits are
preserved across operation modes while per-policy limits are
reinitialized from scratch on a mode switch and both sets of limits
may get out of sync this way.

Fix that by always reinitializing the global limits upon the
registration of the driver.

Fixes: fb1fe1041c (cpufreq: intel_pstate: Operation mode control from sysfs)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2017-02-28 00:05:01 +01:00
parent 17b4eaf475
commit c3a49c8991
1 changed files with 22 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/cpufreq/intel_pstate.c
View File

@ -364,37 +364,25 @@ static bool driver_registered __read_mostly;
static bool acpi_ppc;
#endif
static struct perf_limits performance_limits = {
.no_turbo = 0,
.turbo_disabled = 0,
.max_perf_pct = 100,
.max_perf = int_ext_tofp(1),
.min_perf_pct = 100,
.min_perf = int_ext_tofp(1),
.max_policy_pct = 100,
.max_sysfs_pct = 100,
.min_policy_pct = 0,
.min_sysfs_pct = 0,
};
static struct perf_limits performance_limits;
static struct perf_limits powersave_limits;
static struct perf_limits *limits;
static struct perf_limits powersave_limits = {
.no_turbo = 0,
.turbo_disabled = 0,
.max_perf_pct = 100,
.max_perf = int_ext_tofp(1),
.min_perf_pct = 0,
.min_perf = 0,
.max_policy_pct = 100,
.max_sysfs_pct = 100,
.min_policy_pct = 0,
.min_sysfs_pct = 0,
};
static void intel_pstate_init_limits(struct perf_limits *limits)
{
memset(limits, 0, sizeof(*limits));
limits->max_perf_pct = 100;
limits->max_perf = int_ext_tofp(1);
limits->max_policy_pct = 100;
limits->max_sysfs_pct = 100;
}
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
static struct perf_limits *limits = &performance_limits;
#else
static struct perf_limits *limits = &powersave_limits;
#endif
static void intel_pstate_set_performance_limits(struct perf_limits *limits)
{
intel_pstate_init_limits(limits);
limits->min_perf_pct = 100;
limits->min_perf = int_ext_tofp(1);
}
static DEFINE_MUTEX(intel_pstate_driver_lock);
static DEFINE_MUTEX(intel_pstate_limits_lock);
@ -2084,20 +2072,6 @@ static void intel_pstate_clear_update_util_hook(unsigned int cpu)
synchronize_sched();
}
static void intel_pstate_set_performance_limits(struct perf_limits *limits)
{
limits->no_turbo = 0;
limits->turbo_disabled = 0;
limits->max_perf_pct = 100;
limits->max_perf = int_ext_tofp(1);
limits->min_perf_pct = 100;
limits->min_perf = int_ext_tofp(1);
limits->max_policy_pct = 100;
limits->max_sysfs_pct = 100;
limits->min_policy_pct = 0;
limits->min_sysfs_pct = 0;
}
static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy,
struct perf_limits *limits)
{
@ -2466,6 +2440,11 @@ static int intel_pstate_register_driver(void)
{
int ret;
intel_pstate_init_limits(&powersave_limits);
intel_pstate_set_performance_limits(&performance_limits);
limits = IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE) ?
&performance_limits : &powersave_limits;
ret = cpufreq_register_driver(intel_pstate_driver);
if (ret) {
intel_pstate_driver_cleanup();