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Commit b34ef932 authored by Dasaratharaman Chandramouli's avatar Dasaratharaman Chandramouli Committed by Rafael J. Wysocki
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intel_pstate: Knights Landing support 



 1. Add Knights Landing (KNL) CPUID to the list of CPUIDs supported by
    the intel_pstate driver.

 2. Add a new cpu_default structure for KNL since KNL has a slightly
    different mechanism to get turbo pstates from MSRs.

Signed-off-by: default avatarDasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: default avatarKristen Carlson Accardi <kristen@linux.intel.com>
[ rjw: Subject and changelog ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 5f97899d

drivers/cpufreq/intel_pstate.c

+31 −0
Original line number Diff line number Diff line
@@ -614,6 +614,19 @@ static void core_set_pstate(struct cpudata *cpudata, int pstate) 
	wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);

}



static int knl_get_turbo_pstate(void)

{

	u64 value;

	int nont, ret;



	rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);

	nont = core_get_max_pstate();

	ret = (((value) >> 8) & 0xFF);

	if (ret <= nont)

		ret = nont;

	return ret;

}



static struct cpu_defaults core_params = {

	.pid_policy = {

		.sample_rate_ms = 10,
@@ -651,6 +664,23 @@ static struct cpu_defaults byt_params = { 
	},

};



static struct cpu_defaults knl_params = {

	.pid_policy = {

		.sample_rate_ms = 10,

		.deadband = 0,

		.setpoint = 97,

		.p_gain_pct = 20,

		.d_gain_pct = 0,

		.i_gain_pct = 0,

	},

	.funcs = {

		.get_max = core_get_max_pstate,

		.get_min = core_get_min_pstate,

		.get_turbo = knl_get_turbo_pstate,

		.set = core_set_pstate,

	},

};



static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)

{

	int max_perf = cpu->pstate.turbo_pstate;
@@ -865,6 +895,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = { 
	ICPU(0x4e, core_params),

	ICPU(0x4f, core_params),

	ICPU(0x56, core_params),

	ICPU(0x57, knl_params),

	{}

};

MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);