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Commit e14cf885 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

cpufreq: intel_pstate: Eliminate struct perf_limits 



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: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 80b120ca

drivers/cpufreq/intel_pstate.c

+23 −36
Original line number Diff line number Diff line
@@ -185,20 +185,6 @@ struct _pid { 
	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.

 * @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

 *			current sample

 * @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

 * @valid_pss_table:	Set to true for valid ACPI _PSS entries found

 * @epp_powersave:	Last saved HWP energy performance preference
@@ -268,7 +257,8 @@ struct cpudata { 
	u64	prev_tsc;

	u64	prev_cummulative_iowait;

	struct sample sample;

	struct perf_limits perf_limits;

	int32_t	min_perf;

	int32_t	max_perf;

#ifdef CONFIG_ACPI

	struct acpi_processor_performance acpi_perf_data;

	bool valid_pss_table;
@@ -833,7 +823,6 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy) 


	for_each_cpu(cpu, policy->cpus) {

		struct cpudata *cpu_data = all_cpu_data[cpu];

		struct perf_limits *perf_limits = &cpu_data->perf_limits;

		s16 epp;



		rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
@@ -843,11 +832,11 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy) 
		else

			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)

			min = max;

		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);
@@ -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_adj;

	int min_perf;

	struct perf_limits *perf_limits = &cpu->perf_limits;



	if (global.no_turbo || global.turbo_disabled)

		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

	 * 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,

			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);

}
@@ -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,

					    struct cpudata *cpu)

{

	struct perf_limits *limits = &cpu->perf_limits;

	int max_freq = intel_pstate_get_max_freq(cpu);

	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] */

	if (per_cpu_limits) {

		limits->min_perf = min_policy_perf;

		limits->max_perf = max_policy_perf;

		cpu->min_perf = min_policy_perf;

		cpu->max_perf = max_policy_perf;

	} else {

		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);



		limits->min_perf = max(min_policy_perf, global_min);

		limits->min_perf = min(limits->min_perf, max_policy_perf);

		limits->max_perf = min(max_policy_perf, global_max);

		limits->max_perf = max(min_policy_perf, limits->max_perf);

		cpu->min_perf = max(min_policy_perf, global_min);

		cpu->min_perf = min(cpu->min_perf, max_policy_perf);

		cpu->max_perf = min(max_policy_perf, global_max);

		cpu->max_perf = max(min_policy_perf, cpu->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);

	limits->min_perf = round_up(limits->min_perf, EXT_FRAC_BITS);

	cpu->max_perf = round_up(cpu->max_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,

		 fp_ext_toint(limits->max_perf * 100),

		 fp_ext_toint(limits->min_perf * 100));

		 fp_ext_toint(cpu->max_perf * 100),

		 fp_ext_toint(cpu->min_perf * 100));

}



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->perf_limits.max_perf = int_ext_tofp(1);

	cpu->perf_limits.min_perf = 0;

	cpu->max_perf = int_ext_tofp(1);

	cpu->min_perf = 0;



	policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;

	policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;