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Date: Sun, 13 Nov 2022 16:19:52 +0000
From: "Yuan, Perry" <Perry.Yuan@....com>
To: "Limonciello, Mario" <Mario.Limonciello@....com>,
"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
"Huang, Ray" <Ray.Huang@....com>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>
CC: "Sharma, Deepak" <Deepak.Sharma@....com>,
"Fontenot, Nathan" <Nathan.Fontenot@....com>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
"Huang, Shimmer" <Shimmer.Huang@....com>,
"Du, Xiaojian" <Xiaojian.Du@....com>,
"Meng, Li (Jassmine)" <Li.Meng@....com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 5/8] cpufreq: amd_pstate: implement amd pstate cpu
online and offline callback
[AMD Official Use Only - General]
> -----Original Message-----
> From: Limonciello, Mario <Mario.Limonciello@....com>
> Sent: Tuesday, November 8, 2022 2:22 AM
> To: Yuan, Perry <Perry.Yuan@....com>; rafael.j.wysocki@...el.com; Huang,
> Ray <Ray.Huang@....com>; viresh.kumar@...aro.org
> Cc: Sharma, Deepak <Deepak.Sharma@....com>; Fontenot, Nathan
> <Nathan.Fontenot@....com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Huang, Shimmer
> <Shimmer.Huang@....com>; Du, Xiaojian <Xiaojian.Du@....com>; Meng,
> Li (Jassmine) <Li.Meng@....com>; linux-pm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH v3 5/8] cpufreq: amd_pstate: implement amd pstate cpu
> online and offline callback
>
> On 11/7/2022 11:57, Perry Yuan wrote:
> > Adds online and offline driver callback support to allow cpu cores go
> > offline and help to restore the previous working states when core goes
> > back online later for EPP driver mode.
> >
> > Signed-off-by: Perry Yuan <Perry.Yuan@....com>
>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Thank you.
I pick up the RB tag in the V4.
Perry.
>
> > ---
> > drivers/cpufreq/amd-pstate.c | 89
> ++++++++++++++++++++++++++++++++++++
> > include/linux/amd-pstate.h | 1 +
> > 2 files changed, 90 insertions(+)
> >
> > diff --git a/drivers/cpufreq/amd-pstate.c
> > b/drivers/cpufreq/amd-pstate.c index eb82bc6a7f66..6ce9fca0a128 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -1195,6 +1195,93 @@ static int amd_pstate_epp_set_policy(struct
> cpufreq_policy *policy)
> > return 0;
> > }
> >
> > +static void amd_pstate_epp_reenable(struct amd_cpudata *cpudata) {
> > + struct cppc_perf_ctrls perf_ctrls;
> > + u64 value, max_perf;
> > + int ret;
> > +
> > + ret = amd_pstate_enable(true);
> > + if (ret)
> > + pr_err("failed to enable amd pstate during resume,
> return %d\n",
> > +ret);
> > +
> > + value = READ_ONCE(cpudata->cppc_req_cached);
> > + max_perf = READ_ONCE(cpudata->highest_perf);
> > +
> > + if (boot_cpu_has(X86_FEATURE_CPPC)) {
> > + wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
> > + } else {
> > + perf_ctrls.max_perf = max_perf;
> > + perf_ctrls.energy_perf =
> AMD_CPPC_ENERGY_PERF_PREF(cpudata->epp_cached);
> > + cppc_set_perf(cpudata->cpu, &perf_ctrls);
> > + }
> > +}
> > +
> > +static int amd_pstate_epp_cpu_online(struct cpufreq_policy *policy) {
> > + struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
> > +
> > + pr_debug("AMD CPU Core %d going online\n", cpudata->cpu);
> > +
> > + if (cppc_active) {
> > + amd_pstate_epp_reenable(cpudata);
> > + cpudata->suspended = false;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static void amd_pstate_epp_offline(struct cpufreq_policy *policy) {
> > + struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
> > + struct cppc_perf_ctrls perf_ctrls;
> > + int min_perf;
> > + u64 value;
> > +
> > + min_perf = READ_ONCE(cpudata->lowest_perf);
> > + value = READ_ONCE(cpudata->cppc_req_cached);
> > +
> > + mutex_lock(&amd_pstate_limits_lock);
> > + if (boot_cpu_has(X86_FEATURE_CPPC)) {
> > + cpudata->epp_policy = CPUFREQ_POLICY_UNKNOWN;
> > +
> > + /* Set max perf same as min perf */
> > + value &= ~AMD_CPPC_MAX_PERF(~0L);
> > + value |= AMD_CPPC_MAX_PERF(min_perf);
> > + value &= ~AMD_CPPC_MIN_PERF(~0L);
> > + value |= AMD_CPPC_MIN_PERF(min_perf);
> > + wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
> > + } else {
> > + perf_ctrls.desired_perf = 0;
> > + perf_ctrls.max_perf = min_perf;
> > + perf_ctrls.energy_perf =
> AMD_CPPC_ENERGY_PERF_PREF(AMD_CPPC_EPP_POWERSAVE);
> > + cppc_set_perf(cpudata->cpu, &perf_ctrls);
> > + }
> > + mutex_unlock(&amd_pstate_limits_lock);
> > +}
> > +
> > +static int amd_pstate_cpu_offline(struct cpufreq_policy *policy) {
> > + struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
> > +
> > + pr_debug("AMD CPU Core %d going offline\n", cpudata->cpu);
> > +
> > + if (cpudata->suspended)
> > + return 0;
> > +
> > + if (cppc_active)
> > + amd_pstate_epp_offline(policy);
> > +
> > + return 0;
> > +}
> > +
> > +static int amd_pstate_epp_cpu_offline(struct cpufreq_policy *policy)
> > +{
> > + amd_pstate_clear_update_util_hook(policy->cpu);
> > +
> > + return amd_pstate_cpu_offline(policy); }
> > +
> > static void amd_pstate_verify_cpu_policy(struct amd_cpudata *cpudata,
> > struct cpufreq_policy_data *policy)
> > {
> > @@ -1229,6 +1316,8 @@ static struct cpufreq_driver
> amd_pstate_epp_driver = {
> > .init = amd_pstate_epp_cpu_init,
> > .exit = amd_pstate_epp_cpu_exit,
> > .update_limits = amd_pstate_epp_update_limits,
> > + .offline = amd_pstate_epp_cpu_offline,
> > + .online = amd_pstate_epp_cpu_online,
> > .name = "amd_pstate_epp",
> > .attr = amd_pstate_epp_attr,
> > };
> > diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h
> > index 7e6e8cab97b3..c0ad7eedcae3 100644
> > --- a/include/linux/amd-pstate.h
> > +++ b/include/linux/amd-pstate.h
> > @@ -99,6 +99,7 @@ struct amd_cpudata {
> > u64 cppc_cap1_cached;
> > struct update_util_data update_util;
> > struct amd_aperf_mperf sample;
> > + bool suspended;
> > };
> >
> > /**
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