| Message ID | 20240527051128.110091-1-Dhananjay.Ugwekar@amd.com (mailing list archive) |
|---|---|
| State | Mainlined, archived |
| Headers | show |
| Series | cpufreq: amd-pstate: Fix the inconsistency in max frequency units | expand |
On 5/27/2024 00:11, Dhananjay Ugwekar wrote: > The nominal frequency in cpudata is maintained in MHz whereas all other > frequencies are in KHz. This means we have to convert nominal frequency > value to KHz before we do any interaction with other frequency values. > > In amd_pstate_set_boost(), this conversion from MHz to KHz is missed, > fix that. > > Tested on a AMD Zen4 EPYC server > > Before: > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq > 2151 > $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq > 400000 > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq > 2151 > 409422 > > After: > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq > 2151000 > $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq > 400000 > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq > 2151000 > 1799527 > Cc: stable@vger.kernel.org > Fixes: ec437d71db77 ("cpufreq: amd-pstate: Introduce a new AMD P-State driver to support future processors") > Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> Acked-by: Mario Limonciello <mario.limonciello@amd.com> > --- > drivers/cpufreq/amd-pstate.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index 1b7e82a0ad2e..cde3b91b4422 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -669,7 +669,7 @@ static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) > if (state) > policy->cpuinfo.max_freq = cpudata->max_freq; > else > - policy->cpuinfo.max_freq = cpudata->nominal_freq; > + policy->cpuinfo.max_freq = cpudata->nominal_freq * 1000; > > policy->max = policy->cpuinfo.max_freq; >
On Mon, May 27, 2024 at 09:40:21AM -0500, Mario Limonciello wrote: > On 5/27/2024 00:11, Dhananjay Ugwekar wrote: > > The nominal frequency in cpudata is maintained in MHz whereas all other > > frequencies are in KHz. This means we have to convert nominal frequency > > value to KHz before we do any interaction with other frequency values. > > > > In amd_pstate_set_boost(), this conversion from MHz to KHz is missed, > > fix that. > > > > Tested on a AMD Zen4 EPYC server > > > > Before: > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq > > 2151 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq > > 400000 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq > > 2151 > > 409422 > > > > After: > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq > > 2151000 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq > > 400000 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq > > 2151000 > > 1799527 > > > > Cc: stable@vger.kernel.org > > > Fixes: ec437d71db77 ("cpufreq: amd-pstate: Introduce a new AMD P-State driver to support future processors") > > Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > > Acked-by: Mario Limonciello <mario.limonciello@amd.com> Acked-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > > > --- > > drivers/cpufreq/amd-pstate.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > > index 1b7e82a0ad2e..cde3b91b4422 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -669,7 +669,7 @@ static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) > > if (state) > > policy->cpuinfo.max_freq = cpudata->max_freq; > > else > > - policy->cpuinfo.max_freq = cpudata->nominal_freq; > > + policy->cpuinfo.max_freq = cpudata->nominal_freq * 1000; > > policy->max = policy->cpuinfo.max_freq; >
> > > Fixes: ec437d71db77 ("cpufreq: amd-pstate: Introduce a new AMD P-State driver to support future processors") > > > Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > > > > Acked-by: Mario Limonciello <mario.limonciello@amd.com> > > Acked-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Tested-by: Peter Jung <ptr1337@cachyos.org> Fixes also an introduced regression in amd-pstate=passive reporting wrong frequency values. Also, see[1] [1]https://github.com/CachyOS/linux-cachyos/issues/253#issuecomment-2135659124
On Mon, May 27, 2024 at 4:40 PM Mario Limonciello <mario.limonciello@amd.com> wrote: > > On 5/27/2024 00:11, Dhananjay Ugwekar wrote: > > The nominal frequency in cpudata is maintained in MHz whereas all other > > frequencies are in KHz. This means we have to convert nominal frequency > > value to KHz before we do any interaction with other frequency values. > > > > In amd_pstate_set_boost(), this conversion from MHz to KHz is missed, > > fix that. > > > > Tested on a AMD Zen4 EPYC server > > > > Before: > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq > > 2151 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq > > 400000 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq > > 2151 > > 409422 > > > > After: > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq > > 2151000 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq > > 400000 > > $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq > > 2151000 > > 1799527 > > > > Cc: stable@vger.kernel.org > > > Fixes: ec437d71db77 ("cpufreq: amd-pstate: Introduce a new AMD P-State driver to support future processors") > > Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > > Acked-by: Mario Limonciello <mario.limonciello@amd.com> Applied as 6.10-rc material, thanks! > > --- > > drivers/cpufreq/amd-pstate.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > > index 1b7e82a0ad2e..cde3b91b4422 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -669,7 +669,7 @@ static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) > > if (state) > > policy->cpuinfo.max_freq = cpudata->max_freq; > > else > > - policy->cpuinfo.max_freq = cpudata->nominal_freq; > > + policy->cpuinfo.max_freq = cpudata->nominal_freq * 1000; > > > > policy->max = policy->cpuinfo.max_freq; > > >
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 1b7e82a0ad2e..cde3b91b4422 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -669,7 +669,7 @@ static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state) if (state) policy->cpuinfo.max_freq = cpudata->max_freq; else - policy->cpuinfo.max_freq = cpudata->nominal_freq; + policy->cpuinfo.max_freq = cpudata->nominal_freq * 1000; policy->max = policy->cpuinfo.max_freq;
The nominal frequency in cpudata is maintained in MHz whereas all other frequencies are in KHz. This means we have to convert nominal frequency value to KHz before we do any interaction with other frequency values. In amd_pstate_set_boost(), this conversion from MHz to KHz is missed, fix that. Tested on a AMD Zen4 EPYC server Before: $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq 2151 $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq 400000 $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq 2151 409422 After: $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq | uniq 2151000 $ cat /sys/devices/system/cpu/cpufreq/policy*/cpuinfo_min_freq | uniq 400000 $ cat /sys/devices/system/cpu/cpufreq/policy*/scaling_cur_freq | uniq 2151000 1799527 Fixes: ec437d71db77 ("cpufreq: amd-pstate: Introduce a new AMD P-State driver to support future processors") Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> --- drivers/cpufreq/amd-pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)