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Message-ID: <a4cff15e-2da9-4d00-85e8-d18e7e0f67fb@amd.com>
Date: Wed, 5 Feb 2025 11:46:17 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Dhananjay Ugwekar <dhananjay.ugwekar@....com>, gautham.shenoy@....com,
rafael@...nel.org, viresh.kumar@...aro.org
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 06/12] cpufreq/amd-pstate: Convert all perf values to u8
On 2/5/2025 05:25, Dhananjay Ugwekar wrote:
> All perf values are always within 0-255 range, hence convert their
> datatype to u8 everywhere.
>
> Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
I'll queue this for 6.15.
> ---
> drivers/cpufreq/amd-pstate-trace.h | 46 +++++++++++------------
> drivers/cpufreq/amd-pstate.c | 60 +++++++++++++++---------------
> drivers/cpufreq/amd-pstate.h | 18 ++++-----
> 3 files changed, 62 insertions(+), 62 deletions(-)
>
> diff --git a/drivers/cpufreq/amd-pstate-trace.h b/drivers/cpufreq/amd-pstate-trace.h
> index 8d692415d905..f457d4af2c62 100644
> --- a/drivers/cpufreq/amd-pstate-trace.h
> +++ b/drivers/cpufreq/amd-pstate-trace.h
> @@ -24,9 +24,9 @@
>
> TRACE_EVENT(amd_pstate_perf,
>
> - TP_PROTO(unsigned long min_perf,
> - unsigned long target_perf,
> - unsigned long capacity,
> + TP_PROTO(u8 min_perf,
> + u8 target_perf,
> + u8 capacity,
> u64 freq,
> u64 mperf,
> u64 aperf,
> @@ -47,9 +47,9 @@ TRACE_EVENT(amd_pstate_perf,
> ),
>
> TP_STRUCT__entry(
> - __field(unsigned long, min_perf)
> - __field(unsigned long, target_perf)
> - __field(unsigned long, capacity)
> + __field(u8, min_perf)
> + __field(u8, target_perf)
> + __field(u8, capacity)
> __field(unsigned long long, freq)
> __field(unsigned long long, mperf)
> __field(unsigned long long, aperf)
> @@ -70,10 +70,10 @@ TRACE_EVENT(amd_pstate_perf,
> __entry->fast_switch = fast_switch;
> ),
>
> - TP_printk("amd_min_perf=%lu amd_des_perf=%lu amd_max_perf=%lu freq=%llu mperf=%llu aperf=%llu tsc=%llu cpu_id=%u fast_switch=%s",
> - (unsigned long)__entry->min_perf,
> - (unsigned long)__entry->target_perf,
> - (unsigned long)__entry->capacity,
> + TP_printk("amd_min_perf=%hhu amd_des_perf=%hhu amd_max_perf=%hhu freq=%llu mperf=%llu aperf=%llu tsc=%llu cpu_id=%u fast_switch=%s",
> + (u8)__entry->min_perf,
> + (u8)__entry->target_perf,
> + (u8)__entry->capacity,
> (unsigned long long)__entry->freq,
> (unsigned long long)__entry->mperf,
> (unsigned long long)__entry->aperf,
> @@ -86,10 +86,10 @@ TRACE_EVENT(amd_pstate_perf,
> TRACE_EVENT(amd_pstate_epp_perf,
>
> TP_PROTO(unsigned int cpu_id,
> - unsigned int highest_perf,
> - unsigned int epp,
> - unsigned int min_perf,
> - unsigned int max_perf,
> + u8 highest_perf,
> + u8 epp,
> + u8 min_perf,
> + u8 max_perf,
> bool boost
> ),
>
> @@ -102,10 +102,10 @@ TRACE_EVENT(amd_pstate_epp_perf,
>
> TP_STRUCT__entry(
> __field(unsigned int, cpu_id)
> - __field(unsigned int, highest_perf)
> - __field(unsigned int, epp)
> - __field(unsigned int, min_perf)
> - __field(unsigned int, max_perf)
> + __field(u8, highest_perf)
> + __field(u8, epp)
> + __field(u8, min_perf)
> + __field(u8, max_perf)
> __field(bool, boost)
> ),
>
> @@ -118,12 +118,12 @@ TRACE_EVENT(amd_pstate_epp_perf,
> __entry->boost = boost;
> ),
>
> - TP_printk("cpu%u: [%u<->%u]/%u, epp=%u, boost=%u",
> + TP_printk("cpu%u: [%hhu<->%hhu]/%hhu, epp=%hhu, boost=%u",
> (unsigned int)__entry->cpu_id,
> - (unsigned int)__entry->min_perf,
> - (unsigned int)__entry->max_perf,
> - (unsigned int)__entry->highest_perf,
> - (unsigned int)__entry->epp,
> + (u8)__entry->min_perf,
> + (u8)__entry->max_perf,
> + (u8)__entry->highest_perf,
> + (u8)__entry->epp,
> (bool)__entry->boost
> )
> );
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index e179e929b941..dd4f23fa2587 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -186,7 +186,7 @@ static inline int get_mode_idx_from_str(const char *str, size_t size)
> static DEFINE_MUTEX(amd_pstate_limits_lock);
> static DEFINE_MUTEX(amd_pstate_driver_lock);
>
> -static s16 msr_get_epp(struct amd_cpudata *cpudata)
> +static u8 msr_get_epp(struct amd_cpudata *cpudata)
> {
> u64 value;
> int ret;
> @@ -207,7 +207,7 @@ static inline s16 amd_pstate_get_epp(struct amd_cpudata *cpudata)
> return static_call(amd_pstate_get_epp)(cpudata);
> }
>
> -static s16 shmem_get_epp(struct amd_cpudata *cpudata)
> +static u8 shmem_get_epp(struct amd_cpudata *cpudata)
> {
> u64 epp;
> int ret;
> @@ -218,11 +218,11 @@ static s16 shmem_get_epp(struct amd_cpudata *cpudata)
> return ret;
> }
>
> - return (s16)(epp & 0xff);
> + return FIELD_GET(AMD_CPPC_EPP_PERF_MASK, epp);
> }
>
> -static int msr_update_perf(struct amd_cpudata *cpudata, u32 min_perf,
> - u32 des_perf, u32 max_perf, u32 epp, bool fast_switch)
> +static int msr_update_perf(struct amd_cpudata *cpudata, u8 min_perf,
> + u8 des_perf, u8 max_perf, u8 epp, bool fast_switch)
> {
> u64 value, prev;
>
> @@ -257,15 +257,15 @@ static int msr_update_perf(struct amd_cpudata *cpudata, u32 min_perf,
> DEFINE_STATIC_CALL(amd_pstate_update_perf, msr_update_perf);
>
> static inline int amd_pstate_update_perf(struct amd_cpudata *cpudata,
> - u32 min_perf, u32 des_perf,
> - u32 max_perf, u32 epp,
> + u8 min_perf, u8 des_perf,
> + u8 max_perf, u8 epp,
> bool fast_switch)
> {
> return static_call(amd_pstate_update_perf)(cpudata, min_perf, des_perf,
> max_perf, epp, fast_switch);
> }
>
> -static int msr_set_epp(struct amd_cpudata *cpudata, u32 epp)
> +static int msr_set_epp(struct amd_cpudata *cpudata, u8 epp)
> {
> u64 value, prev;
> int ret;
> @@ -292,12 +292,12 @@ static int msr_set_epp(struct amd_cpudata *cpudata, u32 epp)
>
> DEFINE_STATIC_CALL(amd_pstate_set_epp, msr_set_epp);
>
> -static inline int amd_pstate_set_epp(struct amd_cpudata *cpudata, u32 epp)
> +static inline int amd_pstate_set_epp(struct amd_cpudata *cpudata, u8 epp)
> {
> return static_call(amd_pstate_set_epp)(cpudata, epp);
> }
>
> -static int shmem_set_epp(struct amd_cpudata *cpudata, u32 epp)
> +static int shmem_set_epp(struct amd_cpudata *cpudata, u8 epp)
> {
> int ret;
> struct cppc_perf_ctrls perf_ctrls;
> @@ -320,7 +320,7 @@ static int amd_pstate_set_energy_pref_index(struct cpufreq_policy *policy,
> int pref_index)
> {
> struct amd_cpudata *cpudata = policy->driver_data;
> - int epp;
> + u8 epp;
>
> if (!pref_index)
> epp = cpudata->epp_default;
> @@ -479,8 +479,8 @@ static inline int amd_pstate_init_perf(struct amd_cpudata *cpudata)
> return static_call(amd_pstate_init_perf)(cpudata);
> }
>
> -static int shmem_update_perf(struct amd_cpudata *cpudata, u32 min_perf,
> - u32 des_perf, u32 max_perf, u32 epp, bool fast_switch)
> +static int shmem_update_perf(struct amd_cpudata *cpudata, u8 min_perf,
> + u8 des_perf, u8 max_perf, u8 epp, bool fast_switch)
> {
> struct cppc_perf_ctrls perf_ctrls;
>
> @@ -531,14 +531,14 @@ static inline bool amd_pstate_sample(struct amd_cpudata *cpudata)
> return true;
> }
>
> -static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
> - u32 des_perf, u32 max_perf, bool fast_switch, int gov_flags)
> +static void amd_pstate_update(struct amd_cpudata *cpudata, u8 min_perf,
> + u8 des_perf, u8 max_perf, bool fast_switch, int gov_flags)
> {
> unsigned long max_freq;
> struct cpufreq_policy *policy = cpufreq_cpu_get(cpudata->cpu);
> - u32 nominal_perf = READ_ONCE(cpudata->nominal_perf);
> + u8 nominal_perf = READ_ONCE(cpudata->nominal_perf);
>
> - des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
> + des_perf = clamp_t(u8, des_perf, min_perf, max_perf);
>
> max_freq = READ_ONCE(cpudata->max_limit_freq);
> policy->cur = div_u64(des_perf * max_freq, max_perf);
> @@ -550,7 +550,7 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
>
> /* limit the max perf when core performance boost feature is disabled */
> if (!cpudata->boost_supported)
> - max_perf = min_t(unsigned long, nominal_perf, max_perf);
> + max_perf = min_t(u8, nominal_perf, max_perf);
>
> if (trace_amd_pstate_perf_enabled() && amd_pstate_sample(cpudata)) {
> trace_amd_pstate_perf(min_perf, des_perf, max_perf, cpudata->freq,
> @@ -591,7 +591,8 @@ static int amd_pstate_verify(struct cpufreq_policy_data *policy_data)
>
> static int amd_pstate_update_min_max_limit(struct cpufreq_policy *policy)
> {
> - u32 max_limit_perf, min_limit_perf, max_perf, max_freq;
> + u8 max_limit_perf, min_limit_perf, max_perf;
> + u32 max_freq;
> struct amd_cpudata *cpudata = policy->driver_data;
>
> max_perf = READ_ONCE(cpudata->highest_perf);
> @@ -615,7 +616,7 @@ static int amd_pstate_update_freq(struct cpufreq_policy *policy,
> {
> struct cpufreq_freqs freqs;
> struct amd_cpudata *cpudata = policy->driver_data;
> - unsigned long des_perf, cap_perf;
> + u8 des_perf, cap_perf;
>
> if (!cpudata->max_freq)
> return -ENODEV;
> @@ -670,8 +671,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
> unsigned long target_perf,
> unsigned long capacity)
> {
> - unsigned long max_perf, min_perf, des_perf,
> - cap_perf, min_limit_perf;
> + u8 max_perf, min_perf, des_perf, cap_perf, min_limit_perf;
> struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
> struct amd_cpudata *cpudata;
>
> @@ -904,8 +904,8 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata)
> {
> int ret;
> u32 min_freq, max_freq;
> - u32 highest_perf, nominal_perf, nominal_freq;
> - u32 lowest_nonlinear_perf, lowest_nonlinear_freq;
> + u8 highest_perf, nominal_perf, lowest_nonlinear_perf;
> + u32 nominal_freq, lowest_nonlinear_freq;
> struct cppc_perf_caps cppc_perf;
>
> ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf);
> @@ -1112,7 +1112,7 @@ static ssize_t show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *poli
> static ssize_t show_amd_pstate_highest_perf(struct cpufreq_policy *policy,
> char *buf)
> {
> - u32 perf;
> + u8 perf;
> struct amd_cpudata *cpudata = policy->driver_data;
>
> perf = READ_ONCE(cpudata->highest_perf);
> @@ -1123,7 +1123,7 @@ static ssize_t show_amd_pstate_highest_perf(struct cpufreq_policy *policy,
> static ssize_t show_amd_pstate_prefcore_ranking(struct cpufreq_policy *policy,
> char *buf)
> {
> - u32 perf;
> + u8 perf;
> struct amd_cpudata *cpudata = policy->driver_data;
>
> perf = READ_ONCE(cpudata->prefcore_ranking);
> @@ -1186,7 +1186,7 @@ static ssize_t show_energy_performance_preference(
> struct cpufreq_policy *policy, char *buf)
> {
> struct amd_cpudata *cpudata = policy->driver_data;
> - int preference;
> + u8 preference;
>
> switch (cpudata->epp_cached) {
> case AMD_CPPC_EPP_PERFORMANCE:
> @@ -1548,7 +1548,7 @@ static void amd_pstate_epp_cpu_exit(struct cpufreq_policy *policy)
> static int amd_pstate_epp_update_limit(struct cpufreq_policy *policy)
> {
> struct amd_cpudata *cpudata = policy->driver_data;
> - u32 epp;
> + u8 epp;
>
> amd_pstate_update_min_max_limit(policy);
>
> @@ -1597,7 +1597,7 @@ static int amd_pstate_epp_set_policy(struct cpufreq_policy *policy)
> static int amd_pstate_epp_reenable(struct cpufreq_policy *policy)
> {
> struct amd_cpudata *cpudata = policy->driver_data;
> - u64 max_perf;
> + u8 max_perf;
> int ret;
>
> ret = amd_pstate_cppc_enable(true);
> @@ -1634,7 +1634,7 @@ static int amd_pstate_epp_cpu_online(struct cpufreq_policy *policy)
> static int amd_pstate_epp_cpu_offline(struct cpufreq_policy *policy)
> {
> struct amd_cpudata *cpudata = policy->driver_data;
> - int min_perf;
> + u8 min_perf;
>
> if (cpudata->suspended)
> return 0;
> diff --git a/drivers/cpufreq/amd-pstate.h b/drivers/cpufreq/amd-pstate.h
> index 9747e3be6cee..19d405c6d805 100644
> --- a/drivers/cpufreq/amd-pstate.h
> +++ b/drivers/cpufreq/amd-pstate.h
> @@ -70,13 +70,13 @@ struct amd_cpudata {
> struct freq_qos_request req[2];
> u64 cppc_req_cached;
>
> - u32 highest_perf;
> - u32 nominal_perf;
> - u32 lowest_nonlinear_perf;
> - u32 lowest_perf;
> - u32 prefcore_ranking;
> - u32 min_limit_perf;
> - u32 max_limit_perf;
> + u8 highest_perf;
> + u8 nominal_perf;
> + u8 lowest_nonlinear_perf;
> + u8 lowest_perf;
> + u8 prefcore_ranking;
> + u8 min_limit_perf;
> + u8 max_limit_perf;
> u32 min_limit_freq;
> u32 max_limit_freq;
>
> @@ -93,11 +93,11 @@ struct amd_cpudata {
> bool hw_prefcore;
>
> /* EPP feature related attributes*/
> - s16 epp_cached;
> + u8 epp_cached;
> u32 policy;
> u64 cppc_cap1_cached;
> bool suspended;
> - s16 epp_default;
> + u8 epp_default;
> };
>
> /*
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