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: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> [ rjw: Subject and changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -614,6 +614,19 @@ static void core_set_pstate(struct cpudata *cpudata, int pstate)
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wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
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}
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static int knl_get_turbo_pstate(void)
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{
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u64 value;
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int nont, ret;
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rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
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nont = core_get_max_pstate();
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ret = (((value) >> 8) & 0xFF);
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if (ret <= nont)
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ret = nont;
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return ret;
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}
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static struct cpu_defaults core_params = {
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.pid_policy = {
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.sample_rate_ms = 10,
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@ -651,6 +664,23 @@ static struct cpu_defaults byt_params = {
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},
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};
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static struct cpu_defaults knl_params = {
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.pid_policy = {
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.sample_rate_ms = 10,
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.deadband = 0,
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.setpoint = 97,
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.p_gain_pct = 20,
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.d_gain_pct = 0,
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.i_gain_pct = 0,
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},
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.funcs = {
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.get_max = core_get_max_pstate,
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.get_min = core_get_min_pstate,
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.get_turbo = knl_get_turbo_pstate,
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.set = core_set_pstate,
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},
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};
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static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
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{
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int max_perf = cpu->pstate.turbo_pstate;
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@ -865,6 +895,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
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ICPU(0x4e, core_params),
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ICPU(0x4f, core_params),
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ICPU(0x56, core_params),
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ICPU(0x57, knl_params),
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
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