| Message ID | 31e4c97f791837c97c0b2caca61bcdfeabc3f97f.1711335714.git.perry.yuan@amd.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | AMD Pstate Fixes And Enhancements | expand |
On Mon, Mar 25, 2024 at 11:03:23AM +0800, Yuan, Perry wrote: > Currently the amd_get_{min, max, nominal, lowest_nonlinear}_freq() > helpers computes the values of min_freq, max_freq, nominal_freq and > lowest_nominal_freq respectively afresh from > cppc_get_perf_caps(). This is not necessary as there are fields in > cpudata to cache these values. > > To simplify this, add a single helper function named > amd_pstate_init_freq() which computes all these frequencies at once, and > caches it in cpudata. > > Use the cached values everywhere else in the code. > > Reviewed-by: Li Meng <li.meng@amd.com> > Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > Co-developed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > Signed-off-by: Perry Yuan <perry.yuan@amd.com> I am thinking patch 3 and 4 should be squeezed together, because they are all refining frequencies in cpudata. But I am fine if you want to continue keep them separately. > --- > drivers/cpufreq/amd-pstate.c | 126 ++++++++++++++++------------------- > 1 file changed, 59 insertions(+), 67 deletions(-) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index 2015c9fcc3c9..ba1baa6733e6 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -606,74 +606,22 @@ static void amd_pstate_adjust_perf(unsigned int cpu, > > static int amd_get_min_freq(struct amd_cpudata *cpudata) > { > - struct cppc_perf_caps cppc_perf; > - > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > - if (ret) > - return ret; > - > - /* Switch to khz */ > - return cppc_perf.lowest_freq * 1000; > + return READ_ONCE(cpudata->min_freq); > } > > static int amd_get_max_freq(struct amd_cpudata *cpudata) > { > - struct cppc_perf_caps cppc_perf; > - u32 max_perf, max_freq, nominal_freq, nominal_perf; > - u64 boost_ratio; > - > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > - if (ret) > - return ret; > - > - nominal_freq = cppc_perf.nominal_freq; > - nominal_perf = READ_ONCE(cpudata->nominal_perf); > - max_perf = READ_ONCE(cpudata->highest_perf); > - > - boost_ratio = div_u64(max_perf << SCHED_CAPACITY_SHIFT, > - nominal_perf); > - > - max_freq = nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT; > - > - /* Switch to khz */ > - return max_freq * 1000; > + return READ_ONCE(cpudata->max_freq); > } > > static int amd_get_nominal_freq(struct amd_cpudata *cpudata) > { > - struct cppc_perf_caps cppc_perf; > - > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > - if (ret) > - return ret; > - > - /* Switch to khz */ > - return cppc_perf.nominal_freq * 1000; > + return READ_ONCE(cpudata->nominal_freq); > } > > static int amd_get_lowest_nonlinear_freq(struct amd_cpudata *cpudata) > { > - struct cppc_perf_caps cppc_perf; > - u32 lowest_nonlinear_freq, lowest_nonlinear_perf, > - nominal_freq, nominal_perf; > - u64 lowest_nonlinear_ratio; > - > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > - if (ret) > - return ret; > - > - nominal_freq = cppc_perf.nominal_freq; > - nominal_perf = READ_ONCE(cpudata->nominal_perf); > - > - lowest_nonlinear_perf = cppc_perf.lowest_nonlinear_perf; > - > - lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << SCHED_CAPACITY_SHIFT, > - nominal_perf); > - > - lowest_nonlinear_freq = nominal_freq * lowest_nonlinear_ratio >> SCHED_CAPACITY_SHIFT; > - > - /* Switch to khz */ > - return lowest_nonlinear_freq * 1000; > + return READ_ONCE(cpudata->lowest_nonlinear_freq); > } > > static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) > @@ -828,6 +776,53 @@ static void amd_pstate_update_limits(unsigned int cpu) > mutex_unlock(&amd_pstate_driver_lock); > } > > +/** > + * amd_pstate_init_freq: Initialize the max_freq, min_freq, > + * nominal_freq and lowest_nonlinear_freq for > + * the @cpudata object. > + * > + * Requires: highest_perf, lowest_perf, nominal_perf and > + * lowest_nonlinear_perf members of @cpudata to be > + * initialized. > + * > + * Returns 0 on success, non-zero value on failure. > + */ > +static int amd_pstate_init_freq(struct amd_cpudata *cpudata) > +{ > + int ret; > + u32 min_freq; > + u32 highest_perf, max_freq; > + u32 nominal_perf, nominal_freq; > + u32 lowest_nonlinear_perf, lowest_nonlinear_freq; > + u32 boost_ratio, lowest_nonlinear_ratio; > + struct cppc_perf_caps cppc_perf; > + > + > + ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > + if (ret) > + return ret; > + > + min_freq = cppc_perf.lowest_freq * 1000; > + nominal_freq = cppc_perf.nominal_freq * 1000; > + nominal_perf = READ_ONCE(cpudata->nominal_perf); > + > + highest_perf = READ_ONCE(cpudata->highest_perf); > + boost_ratio = div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf); > + max_freq = nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT; > + > + lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); > + lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << SCHED_CAPACITY_SHIFT, > + nominal_perf); > + lowest_nonlinear_freq = nominal_freq * lowest_nonlinear_ratio >> SCHED_CAPACITY_SHIFT; > + > + WRITE_ONCE(cpudata->min_freq, min_freq); > + WRITE_ONCE(cpudata->lowest_nonlinear_freq, lowest_nonlinear_freq); > + WRITE_ONCE(cpudata->nominal_freq, nominal_freq); > + WRITE_ONCE(cpudata->max_freq, max_freq); > + > + return 0; > +} > + > static int amd_pstate_cpu_init(struct cpufreq_policy *policy) > { > int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret; > @@ -855,6 +850,10 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) > if (ret) > goto free_cpudata1; > > + ret = amd_pstate_init_freq(cpudata); > + if (ret) > + goto free_cpudata1; > + > min_freq = amd_get_min_freq(cpudata); > max_freq = amd_get_max_freq(cpudata); > nominal_freq = amd_get_nominal_freq(cpudata); > @@ -896,13 +895,8 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) > goto free_cpudata2; > } > > - /* Initial processor data capability frequencies */ > - cpudata->max_freq = max_freq; > - cpudata->min_freq = min_freq; > cpudata->max_limit_freq = max_freq; > cpudata->min_limit_freq = min_freq; > - cpudata->nominal_freq = nominal_freq; > - cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; > > policy->driver_data = cpudata; > > @@ -1317,6 +1311,10 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) > if (ret) > goto free_cpudata1; > > + ret = amd_pstate_init_freq(cpudata); > + if (ret) > + goto free_cpudata1; > + > min_freq = amd_get_min_freq(cpudata); > max_freq = amd_get_max_freq(cpudata); > nominal_freq = amd_get_nominal_freq(cpudata); > @@ -1333,12 +1331,6 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) > /* It will be updated by governor */ > policy->cur = policy->cpuinfo.min_freq; > > - /* Initial processor data capability frequencies */ > - cpudata->max_freq = max_freq; > - cpudata->min_freq = min_freq; > - cpudata->nominal_freq = nominal_freq; > - cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; > - > policy->driver_data = cpudata; > > cpudata->epp_cached = amd_pstate_get_epp(cpudata, 0); > -- > 2.34.1 >
[AMD Official Use Only - General] > -----Original Message----- > From: Huang, Ray <Ray.Huang@amd.com> > Sent: Monday, April 15, 2024 10:55 PM > To: Yuan, Perry <Perry.Yuan@amd.com> > Cc: rafael.j.wysocki@intel.com; Limonciello, Mario > <Mario.Limonciello@amd.com>; viresh.kumar@linaro.org; Shenoy, Gautham > Ranjal <gautham.shenoy@amd.com>; Petkov, Borislav > <Borislav.Petkov@amd.com>; Deucher, Alexander > <Alexander.Deucher@amd.com>; Huang, Shimmer > <Shimmer.Huang@amd.com>; oleksandr@natalenko.name; Du, Xiaojian > <Xiaojian.Du@amd.com>; Meng, Li (Jassmine) <Li.Meng@amd.com>; linux- > pm@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH v10 3/8] cpufreq: amd-pstate: Unify computation of > {max,min,nominal,lowest_nonlinear}_freq > > On Mon, Mar 25, 2024 at 11:03:23AM +0800, Yuan, Perry wrote: > > Currently the amd_get_{min, max, nominal, lowest_nonlinear}_freq() > > helpers computes the values of min_freq, max_freq, nominal_freq and > > lowest_nominal_freq respectively afresh from cppc_get_perf_caps(). > > This is not necessary as there are fields in cpudata to cache these > > values. > > > > To simplify this, add a single helper function named > > amd_pstate_init_freq() which computes all these frequencies at once, > > and caches it in cpudata. > > > > Use the cached values everywhere else in the code. > > > > Reviewed-by: Li Meng <li.meng@amd.com> > > Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > > Co-developed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > > Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > > Signed-off-by: Perry Yuan <perry.yuan@amd.com> > > I am thinking patch 3 and 4 should be squeezed together, because they are all > refining frequencies in cpudata. But I am fine if you want to continue keep > them separately. Yes, we would like to keep changes in two patches, then patches don't need to get review again in v11. Thanks. Perry. > > > --- > > drivers/cpufreq/amd-pstate.c | 126 > > ++++++++++++++++------------------- > > 1 file changed, 59 insertions(+), 67 deletions(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c > > b/drivers/cpufreq/amd-pstate.c index 2015c9fcc3c9..ba1baa6733e6 > 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -606,74 +606,22 @@ static void amd_pstate_adjust_perf(unsigned int > > cpu, > > > > static int amd_get_min_freq(struct amd_cpudata *cpudata) { > > - struct cppc_perf_caps cppc_perf; > > - > > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > > - if (ret) > > - return ret; > > - > > - /* Switch to khz */ > > - return cppc_perf.lowest_freq * 1000; > > + return READ_ONCE(cpudata->min_freq); > > } > > > > static int amd_get_max_freq(struct amd_cpudata *cpudata) { > > - struct cppc_perf_caps cppc_perf; > > - u32 max_perf, max_freq, nominal_freq, nominal_perf; > > - u64 boost_ratio; > > - > > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > > - if (ret) > > - return ret; > > - > > - nominal_freq = cppc_perf.nominal_freq; > > - nominal_perf = READ_ONCE(cpudata->nominal_perf); > > - max_perf = READ_ONCE(cpudata->highest_perf); > > - > > - boost_ratio = div_u64(max_perf << SCHED_CAPACITY_SHIFT, > > - nominal_perf); > > - > > - max_freq = nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT; > > - > > - /* Switch to khz */ > > - return max_freq * 1000; > > + return READ_ONCE(cpudata->max_freq); > > } > > > > static int amd_get_nominal_freq(struct amd_cpudata *cpudata) { > > - struct cppc_perf_caps cppc_perf; > > - > > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > > - if (ret) > > - return ret; > > - > > - /* Switch to khz */ > > - return cppc_perf.nominal_freq * 1000; > > + return READ_ONCE(cpudata->nominal_freq); > > } > > > > static int amd_get_lowest_nonlinear_freq(struct amd_cpudata *cpudata) > > { > > - struct cppc_perf_caps cppc_perf; > > - u32 lowest_nonlinear_freq, lowest_nonlinear_perf, > > - nominal_freq, nominal_perf; > > - u64 lowest_nonlinear_ratio; > > - > > - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > > - if (ret) > > - return ret; > > - > > - nominal_freq = cppc_perf.nominal_freq; > > - nominal_perf = READ_ONCE(cpudata->nominal_perf); > > - > > - lowest_nonlinear_perf = cppc_perf.lowest_nonlinear_perf; > > - > > - lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << > SCHED_CAPACITY_SHIFT, > > - nominal_perf); > > - > > - lowest_nonlinear_freq = nominal_freq * lowest_nonlinear_ratio >> > SCHED_CAPACITY_SHIFT; > > - > > - /* Switch to khz */ > > - return lowest_nonlinear_freq * 1000; > > + return READ_ONCE(cpudata->lowest_nonlinear_freq); > > } > > > > static int amd_pstate_set_boost(struct cpufreq_policy *policy, int > > state) @@ -828,6 +776,53 @@ static void > amd_pstate_update_limits(unsigned int cpu) > > mutex_unlock(&amd_pstate_driver_lock); > > } > > > > +/** > > + * amd_pstate_init_freq: Initialize the max_freq, min_freq, > > + * nominal_freq and lowest_nonlinear_freq for > > + * the @cpudata object. > > + * > > + * Requires: highest_perf, lowest_perf, nominal_perf and > > + * lowest_nonlinear_perf members of @cpudata to be > > + * initialized. > > + * > > + * Returns 0 on success, non-zero value on failure. > > + */ > > +static int amd_pstate_init_freq(struct amd_cpudata *cpudata) { > > + int ret; > > + u32 min_freq; > > + u32 highest_perf, max_freq; > > + u32 nominal_perf, nominal_freq; > > + u32 lowest_nonlinear_perf, lowest_nonlinear_freq; > > + u32 boost_ratio, lowest_nonlinear_ratio; > > + struct cppc_perf_caps cppc_perf; > > + > > + > > + ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > > + if (ret) > > + return ret; > > + > > + min_freq = cppc_perf.lowest_freq * 1000; > > + nominal_freq = cppc_perf.nominal_freq * 1000; > > + nominal_perf = READ_ONCE(cpudata->nominal_perf); > > + > > + highest_perf = READ_ONCE(cpudata->highest_perf); > > + boost_ratio = div_u64(highest_perf << SCHED_CAPACITY_SHIFT, > nominal_perf); > > + max_freq = nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT; > > + > > + lowest_nonlinear_perf = READ_ONCE(cpudata- > >lowest_nonlinear_perf); > > + lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << > SCHED_CAPACITY_SHIFT, > > + nominal_perf); > > + lowest_nonlinear_freq = nominal_freq * lowest_nonlinear_ratio >> > > +SCHED_CAPACITY_SHIFT; > > + > > + WRITE_ONCE(cpudata->min_freq, min_freq); > > + WRITE_ONCE(cpudata->lowest_nonlinear_freq, > lowest_nonlinear_freq); > > + WRITE_ONCE(cpudata->nominal_freq, nominal_freq); > > + WRITE_ONCE(cpudata->max_freq, max_freq); > > + > > + return 0; > > +} > > + > > static int amd_pstate_cpu_init(struct cpufreq_policy *policy) { > > int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret; > @@ > > -855,6 +850,10 @@ static int amd_pstate_cpu_init(struct cpufreq_policy > *policy) > > if (ret) > > goto free_cpudata1; > > > > + ret = amd_pstate_init_freq(cpudata); > > + if (ret) > > + goto free_cpudata1; > > + > > min_freq = amd_get_min_freq(cpudata); > > max_freq = amd_get_max_freq(cpudata); > > nominal_freq = amd_get_nominal_freq(cpudata); @@ -896,13 > +895,8 @@ > > static int amd_pstate_cpu_init(struct cpufreq_policy *policy) > > goto free_cpudata2; > > } > > > > - /* Initial processor data capability frequencies */ > > - cpudata->max_freq = max_freq; > > - cpudata->min_freq = min_freq; > > cpudata->max_limit_freq = max_freq; > > cpudata->min_limit_freq = min_freq; > > - cpudata->nominal_freq = nominal_freq; > > - cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; > > > > policy->driver_data = cpudata; > > > > @@ -1317,6 +1311,10 @@ static int amd_pstate_epp_cpu_init(struct > cpufreq_policy *policy) > > if (ret) > > goto free_cpudata1; > > > > + ret = amd_pstate_init_freq(cpudata); > > + if (ret) > > + goto free_cpudata1; > > + > > min_freq = amd_get_min_freq(cpudata); > > max_freq = amd_get_max_freq(cpudata); > > nominal_freq = amd_get_nominal_freq(cpudata); @@ -1333,12 > +1331,6 @@ > > static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) > > /* It will be updated by governor */ > > policy->cur = policy->cpuinfo.min_freq; > > > > - /* Initial processor data capability frequencies */ > > - cpudata->max_freq = max_freq; > > - cpudata->min_freq = min_freq; > > - cpudata->nominal_freq = nominal_freq; > > - cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; > > - > > policy->driver_data = cpudata; > > > > cpudata->epp_cached = amd_pstate_get_epp(cpudata, 0); > > -- > > 2.34.1 > >
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 2015c9fcc3c9..ba1baa6733e6 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -606,74 +606,22 @@ static void amd_pstate_adjust_perf(unsigned int cpu, static int amd_get_min_freq(struct amd_cpudata *cpudata) { - struct cppc_perf_caps cppc_perf; - - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); - if (ret) - return ret; - - /* Switch to khz */ - return cppc_perf.lowest_freq * 1000; + return READ_ONCE(cpudata->min_freq); } static int amd_get_max_freq(struct amd_cpudata *cpudata) { - struct cppc_perf_caps cppc_perf; - u32 max_perf, max_freq, nominal_freq, nominal_perf; - u64 boost_ratio; - - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); - if (ret) - return ret; - - nominal_freq = cppc_perf.nominal_freq; - nominal_perf = READ_ONCE(cpudata->nominal_perf); - max_perf = READ_ONCE(cpudata->highest_perf); - - boost_ratio = div_u64(max_perf << SCHED_CAPACITY_SHIFT, - nominal_perf); - - max_freq = nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT; - - /* Switch to khz */ - return max_freq * 1000; + return READ_ONCE(cpudata->max_freq); } static int amd_get_nominal_freq(struct amd_cpudata *cpudata) { - struct cppc_perf_caps cppc_perf; - - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); - if (ret) - return ret; - - /* Switch to khz */ - return cppc_perf.nominal_freq * 1000; + return READ_ONCE(cpudata->nominal_freq); } static int amd_get_lowest_nonlinear_freq(struct amd_cpudata *cpudata) { - struct cppc_perf_caps cppc_perf; - u32 lowest_nonlinear_freq, lowest_nonlinear_perf, - nominal_freq, nominal_perf; - u64 lowest_nonlinear_ratio; - - int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); - if (ret) - return ret; - - nominal_freq = cppc_perf.nominal_freq; - nominal_perf = READ_ONCE(cpudata->nominal_perf); - - lowest_nonlinear_perf = cppc_perf.lowest_nonlinear_perf; - - lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << SCHED_CAPACITY_SHIFT, - nominal_perf); - - lowest_nonlinear_freq = nominal_freq * lowest_nonlinear_ratio >> SCHED_CAPACITY_SHIFT; - - /* Switch to khz */ - return lowest_nonlinear_freq * 1000; + return READ_ONCE(cpudata->lowest_nonlinear_freq); } static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) @@ -828,6 +776,53 @@ static void amd_pstate_update_limits(unsigned int cpu) mutex_unlock(&amd_pstate_driver_lock); } +/** + * amd_pstate_init_freq: Initialize the max_freq, min_freq, + * nominal_freq and lowest_nonlinear_freq for + * the @cpudata object. + * + * Requires: highest_perf, lowest_perf, nominal_perf and + * lowest_nonlinear_perf members of @cpudata to be + * initialized. + * + * Returns 0 on success, non-zero value on failure. + */ +static int amd_pstate_init_freq(struct amd_cpudata *cpudata) +{ + int ret; + u32 min_freq; + u32 highest_perf, max_freq; + u32 nominal_perf, nominal_freq; + u32 lowest_nonlinear_perf, lowest_nonlinear_freq; + u32 boost_ratio, lowest_nonlinear_ratio; + struct cppc_perf_caps cppc_perf; + + + ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); + if (ret) + return ret; + + min_freq = cppc_perf.lowest_freq * 1000; + nominal_freq = cppc_perf.nominal_freq * 1000; + nominal_perf = READ_ONCE(cpudata->nominal_perf); + + highest_perf = READ_ONCE(cpudata->highest_perf); + boost_ratio = div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf); + max_freq = nominal_freq * boost_ratio >> SCHED_CAPACITY_SHIFT; + + lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); + lowest_nonlinear_ratio = div_u64(lowest_nonlinear_perf << SCHED_CAPACITY_SHIFT, + nominal_perf); + lowest_nonlinear_freq = nominal_freq * lowest_nonlinear_ratio >> SCHED_CAPACITY_SHIFT; + + WRITE_ONCE(cpudata->min_freq, min_freq); + WRITE_ONCE(cpudata->lowest_nonlinear_freq, lowest_nonlinear_freq); + WRITE_ONCE(cpudata->nominal_freq, nominal_freq); + WRITE_ONCE(cpudata->max_freq, max_freq); + + return 0; +} + static int amd_pstate_cpu_init(struct cpufreq_policy *policy) { int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret; @@ -855,6 +850,10 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) if (ret) goto free_cpudata1; + ret = amd_pstate_init_freq(cpudata); + if (ret) + goto free_cpudata1; + min_freq = amd_get_min_freq(cpudata); max_freq = amd_get_max_freq(cpudata); nominal_freq = amd_get_nominal_freq(cpudata); @@ -896,13 +895,8 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) goto free_cpudata2; } - /* Initial processor data capability frequencies */ - cpudata->max_freq = max_freq; - cpudata->min_freq = min_freq; cpudata->max_limit_freq = max_freq; cpudata->min_limit_freq = min_freq; - cpudata->nominal_freq = nominal_freq; - cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; policy->driver_data = cpudata; @@ -1317,6 +1311,10 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) if (ret) goto free_cpudata1; + ret = amd_pstate_init_freq(cpudata); + if (ret) + goto free_cpudata1; + min_freq = amd_get_min_freq(cpudata); max_freq = amd_get_max_freq(cpudata); nominal_freq = amd_get_nominal_freq(cpudata); @@ -1333,12 +1331,6 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) /* It will be updated by governor */ policy->cur = policy->cpuinfo.min_freq; - /* Initial processor data capability frequencies */ - cpudata->max_freq = max_freq; - cpudata->min_freq = min_freq; - cpudata->nominal_freq = nominal_freq; - cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq; - policy->driver_data = cpudata; cpudata->epp_cached = amd_pstate_get_epp(cpudata, 0);
Currently the amd_get_{min, max, nominal, lowest_nonlinear}_freq() helpers computes the values of min_freq, max_freq, nominal_freq and lowest_nominal_freq respectively afresh from cppc_get_perf_caps(). This is not necessary as there are fields in cpudata to cache these values. To simplify this, add a single helper function named amd_pstate_init_freq() which computes all these frequencies at once, and caches it in cpudata. Use the cached values everywhere else in the code. Reviewed-by: Li Meng <li.meng@amd.com> Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> Co-developed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Signed-off-by: Perry Yuan <perry.yuan@amd.com> --- drivers/cpufreq/amd-pstate.c | 126 ++++++++++++++++------------------- 1 file changed, 59 insertions(+), 67 deletions(-)