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cpufreq: intel_pstate: Eliminate struct perf_limits

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After recent changes the purpose of struct perf_limits is not
particularly clear any more and the code may be made somewhat
easier to follow by eliminating it, so go for that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2017-03-28 00:03:20 +02:00
parent 80b120ca1a
commit e14cf8857e
1 changed files with 23 additions and 36 deletions
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59
drivers/cpufreq/intel_pstate.c
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@ -185,20 +185,6 @@ struct _pid {
int32_t last_err; int32_t last_err;
}; };
/**
* struct perf_limits - Store user and policy limits
* @max_perf: This is a scaled value between 0 to 255 for max_perf_pct
* This value is used to limit max pstate
* @min_perf: This is a scaled value between 0 to 255 for min_perf_pct
* This value is used to limit min pstate
*
* Storage for policy defined limits.
*/
struct perf_limits {
int32_t max_perf;
int32_t min_perf;
};
/** /**
* struct global_params - Global parameters, mostly tunable via sysfs. * struct global_params - Global parameters, mostly tunable via sysfs.
* @no_turbo: Whether or not to use turbo P-states. * @no_turbo: Whether or not to use turbo P-states.
@ -236,7 +222,10 @@ struct global_params {
* @prev_cummulative_iowait: IO Wait time difference from last and * @prev_cummulative_iowait: IO Wait time difference from last and
* current sample * current sample
* @sample: Storage for storing last Sample data * @sample: Storage for storing last Sample data
* @perf_limits: Capacity limits unique to this CPU * @min_perf: Minimum capacity limit as a fraction of the maximum
* turbo P-state capacity.
* @max_perf: Maximum capacity limit as a fraction of the maximum
* turbo P-state capacity.
* @acpi_perf_data: Stores ACPI perf information read from _PSS * @acpi_perf_data: Stores ACPI perf information read from _PSS
* @valid_pss_table: Set to true for valid ACPI _PSS entries found * @valid_pss_table: Set to true for valid ACPI _PSS entries found
* @epp_powersave: Last saved HWP energy performance preference * @epp_powersave: Last saved HWP energy performance preference
@ -268,7 +257,8 @@ struct cpudata {
u64 prev_tsc; u64 prev_tsc;
u64 prev_cummulative_iowait; u64 prev_cummulative_iowait;
struct sample sample; struct sample sample;
struct perf_limits perf_limits; int32_t min_perf;
int32_t max_perf;
#ifdef CONFIG_ACPI #ifdef CONFIG_ACPI
struct acpi_processor_performance acpi_perf_data; struct acpi_processor_performance acpi_perf_data;
bool valid_pss_table; bool valid_pss_table;
@ -833,7 +823,6 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
for_each_cpu(cpu, policy->cpus) { for_each_cpu(cpu, policy->cpus) {
struct cpudata *cpu_data = all_cpu_data[cpu]; struct cpudata *cpu_data = all_cpu_data[cpu];
struct perf_limits *perf_limits = &cpu_data->perf_limits;
s16 epp; s16 epp;
rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap); rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
@ -843,11 +832,11 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
else else
hw_max = HWP_HIGHEST_PERF(cap); hw_max = HWP_HIGHEST_PERF(cap);
max = fp_ext_toint(hw_max * perf_limits->max_perf); max = fp_ext_toint(hw_max * cpu_data->max_perf);
if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
min = max; min = max;
else else
min = fp_ext_toint(hw_max * perf_limits->min_perf); min = fp_ext_toint(hw_max * cpu_data->min_perf);
rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
@ -1637,7 +1626,6 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
int max_perf = cpu->pstate.turbo_pstate; int max_perf = cpu->pstate.turbo_pstate;
int max_perf_adj; int max_perf_adj;
int min_perf; int min_perf;
struct perf_limits *perf_limits = &cpu->perf_limits;
if (global.no_turbo || global.turbo_disabled) if (global.no_turbo || global.turbo_disabled)
max_perf = cpu->pstate.max_pstate; max_perf = cpu->pstate.max_pstate;
@ -1647,11 +1635,11 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
* policy, or by cpu specific default values determined through * policy, or by cpu specific default values determined through
* experimentation. * experimentation.
*/ */
max_perf_adj = fp_ext_toint(max_perf * perf_limits->max_perf); max_perf_adj = fp_ext_toint(max_perf * cpu->max_perf);
*max = clamp_t(int, max_perf_adj, *max = clamp_t(int, max_perf_adj,
cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
min_perf = fp_ext_toint(max_perf * perf_limits->min_perf); min_perf = fp_ext_toint(max_perf * cpu->min_perf);
*min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf);
} }
@ -2030,7 +2018,6 @@ static int intel_pstate_get_max_freq(struct cpudata *cpu)
static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy, static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy,
struct cpudata *cpu) struct cpudata *cpu)
{ {
struct perf_limits *limits = &cpu->perf_limits;
int max_freq = intel_pstate_get_max_freq(cpu); int max_freq = intel_pstate_get_max_freq(cpu);
int32_t max_policy_perf, min_policy_perf; int32_t max_policy_perf, min_policy_perf;
@ -2046,8 +2033,8 @@ static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy,
/* Normalize user input to [min_perf, max_perf] */ /* Normalize user input to [min_perf, max_perf] */
if (per_cpu_limits) { if (per_cpu_limits) {
limits->min_perf = min_policy_perf; cpu->min_perf = min_policy_perf;
limits->max_perf = max_policy_perf; cpu->max_perf = max_policy_perf;
} else { } else {
int32_t global_min, global_max; int32_t global_min, global_max;
@ -2064,21 +2051,21 @@ static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy,
} }
global_min = clamp_t(int32_t, global_min, 0, global_max); global_min = clamp_t(int32_t, global_min, 0, global_max);
limits->min_perf = max(min_policy_perf, global_min); cpu->min_perf = max(min_policy_perf, global_min);
limits->min_perf = min(limits->min_perf, max_policy_perf); cpu->min_perf = min(cpu->min_perf, max_policy_perf);
limits->max_perf = min(max_policy_perf, global_max); cpu->max_perf = min(max_policy_perf, global_max);
limits->max_perf = max(min_policy_perf, limits->max_perf); cpu->max_perf = max(min_policy_perf, cpu->max_perf);
/* Make sure min_perf <= max_perf */ /* Make sure min_perf <= max_perf */
limits->min_perf = min(limits->min_perf, limits->max_perf); cpu->min_perf = min(cpu->min_perf, cpu->max_perf);
} }
limits->max_perf = round_up(limits->max_perf, EXT_FRAC_BITS); cpu->max_perf = round_up(cpu->max_perf, EXT_FRAC_BITS);
limits->min_perf = round_up(limits->min_perf, EXT_FRAC_BITS); cpu->min_perf = round_up(cpu->min_perf, EXT_FRAC_BITS);
pr_debug("cpu:%d max_perf_pct:%d min_perf_pct:%d\n", policy->cpu, pr_debug("cpu:%d max_perf_pct:%d min_perf_pct:%d\n", policy->cpu,
fp_ext_toint(limits->max_perf * 100), fp_ext_toint(cpu->max_perf * 100),
fp_ext_toint(limits->min_perf * 100)); fp_ext_toint(cpu->min_perf * 100));
} }
static int intel_pstate_set_policy(struct cpufreq_policy *policy) static int intel_pstate_set_policy(struct cpufreq_policy *policy)
@ -2181,8 +2168,8 @@ static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
cpu = all_cpu_data[policy->cpu]; cpu = all_cpu_data[policy->cpu];
cpu->perf_limits.max_perf = int_ext_tofp(1); cpu->max_perf = int_ext_tofp(1);
cpu->perf_limits.min_perf = 0; cpu->min_perf = 0;
policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;