| Message ID | 20231123082757.3527-1-gautham.shenoy@amd.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | cpufreq/amd-pstate: Fix the return value of amd_pstate_fast_switch() | expand |
[AMD Official Use Only - General] > -----Original Message----- > From: Shenoy, Gautham Ranjal <gautham.shenoy@amd.com> > Sent: Thursday, November 23, 2023 4:28 PM > To: Karny, Wyes <Wyes.Karny@amd.com>; Huang, Ray > <Ray.Huang@amd.com>; Limonciello, Mario <Mario.Limonciello@amd.com>; > Yuan, Perry <Perry.Yuan@amd.com>; Rafael J . Wysocki <rafael@kernel.org>; > Viresh Kumar <viresh.kumar@linaro.org> > Cc: linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Shenoy, Gautham > Ranjal <gautham.shenoy@amd.com> > Subject: [PATCH] cpufreq/amd-pstate: Fix the return value of > amd_pstate_fast_switch() > > cpufreq_driver->fast_switch() callback expects a frequency as a return value. > amd_pstate_fast_switch() was returning the return value of > amd_pstate_update_freq(), which only indicates a success or failure. > > Fix this by making amd_pstate_fast_switch() return the target_freq when the > call to amd_pstate_update_freq() is successful, and return the current > frequency from policy->cur when the call to > amd_pstate_update_freq() is unsuccessful. > > Fixes: 4badf2eb1e98 ("cpufreq: amd-pstate: Add ->fast_switch() callback") > Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > --- > drivers/cpufreq/amd-pstate.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index 9a1e194d5cf8..300f81d36291 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -518,7 +518,9 @@ static int amd_pstate_target(struct cpufreq_policy > *policy, static unsigned int amd_pstate_fast_switch(struct cpufreq_policy > *policy, > unsigned int target_freq) > { > - return amd_pstate_update_freq(policy, target_freq, true); > + if (!amd_pstate_update_freq(policy, target_freq, true)) > + return target_freq; > + return policy->cur; > } > > static void amd_pstate_adjust_perf(unsigned int cpu, > -- > 2.25.1 LGTM Thank you for the fix. Reviewed-by: Perry Yuan <perry.yuan@amd.com>
On 23 Nov 13:57, Gautham R. Shenoy wrote: > cpufreq_driver->fast_switch() callback expects a frequency as a return > value. amd_pstate_fast_switch() was returning the return value of > amd_pstate_update_freq(), which only indicates a success or failure. > > Fix this by making amd_pstate_fast_switch() return the target_freq > when the call to amd_pstate_update_freq() is successful, and return > the current frequency from policy->cur when the call to > amd_pstate_update_freq() is unsuccessful. > > Fixes: 4badf2eb1e98 ("cpufreq: amd-pstate: Add ->fast_switch() callback") Reviewed-by: Wyes Karny <wyes.karny@amd.com> > Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > --- > drivers/cpufreq/amd-pstate.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index 9a1e194d5cf8..300f81d36291 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -518,7 +518,9 @@ static int amd_pstate_target(struct cpufreq_policy *policy, > static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy, > unsigned int target_freq) > { > - return amd_pstate_update_freq(policy, target_freq, true); > + if (!amd_pstate_update_freq(policy, target_freq, true)) > + return target_freq; > + return policy->cur; > } > > static void amd_pstate_adjust_perf(unsigned int cpu, > -- > 2.25.1 >
On Fri, Nov 24, 2023 at 12:23:58PM +0800, Karny, Wyes wrote: > On 23 Nov 13:57, Gautham R. Shenoy wrote: > > cpufreq_driver->fast_switch() callback expects a frequency as a return > > value. amd_pstate_fast_switch() was returning the return value of > > amd_pstate_update_freq(), which only indicates a success or failure. > > > > Fix this by making amd_pstate_fast_switch() return the target_freq > > when the call to amd_pstate_update_freq() is successful, and return > > the current frequency from policy->cur when the call to > > amd_pstate_update_freq() is unsuccessful. > > > > Fixes: 4badf2eb1e98 ("cpufreq: amd-pstate: Add ->fast_switch() callback") > > Reviewed-by: Wyes Karny <wyes.karny@amd.com> > Acked-by: Huang Rui <ray.huang@amd.com> Do you want to cc stable mailing list to fix it in stable kernels? Thanks, Ray > > Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > > --- > > drivers/cpufreq/amd-pstate.c | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > > index 9a1e194d5cf8..300f81d36291 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -518,7 +518,9 @@ static int amd_pstate_target(struct cpufreq_policy *policy, > > static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy, > > unsigned int target_freq) > > { > > - return amd_pstate_update_freq(policy, target_freq, true); > > + if (!amd_pstate_update_freq(policy, target_freq, true)) > > + return target_freq; > > + return policy->cur; > > } > > > > static void amd_pstate_adjust_perf(unsigned int cpu, > > -- > > 2.25.1 > >
On Fri, Nov 24, 2023 at 03:31:34PM +0800, Huang Rui wrote: > On Fri, Nov 24, 2023 at 12:23:58PM +0800, Karny, Wyes wrote: > > On 23 Nov 13:57, Gautham R. Shenoy wrote: > > > cpufreq_driver->fast_switch() callback expects a frequency as a return > > > value. amd_pstate_fast_switch() was returning the return value of > > > amd_pstate_update_freq(), which only indicates a success or failure. > > > > > > Fix this by making amd_pstate_fast_switch() return the target_freq > > > when the call to amd_pstate_update_freq() is successful, and return > > > the current frequency from policy->cur when the call to > > > amd_pstate_update_freq() is unsuccessful. > > > > > > Fixes: 4badf2eb1e98 ("cpufreq: amd-pstate: Add ->fast_switch() callback") > > > > Reviewed-by: Wyes Karny <wyes.karny@amd.com> > > > > Acked-by: Huang Rui <ray.huang@amd.com> Thanks! > > Do you want to cc stable mailing list to fix it in stable kernels? Yes, I forgot to do that. I will send a v2 having collected your Acked-by and the Reviewed-by's from Perry and Wyes. > > Thanks, > Ray -- Thanks and Regards gautham.
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 9a1e194d5cf8..300f81d36291 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -518,7 +518,9 @@ static int amd_pstate_target(struct cpufreq_policy *policy, static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy, unsigned int target_freq) { - return amd_pstate_update_freq(policy, target_freq, true); + if (!amd_pstate_update_freq(policy, target_freq, true)) + return target_freq; + return policy->cur; } static void amd_pstate_adjust_perf(unsigned int cpu,
cpufreq_driver->fast_switch() callback expects a frequency as a return value. amd_pstate_fast_switch() was returning the return value of amd_pstate_update_freq(), which only indicates a success or failure. Fix this by making amd_pstate_fast_switch() return the target_freq when the call to amd_pstate_update_freq() is successful, and return the current frequency from policy->cur when the call to amd_pstate_update_freq() is unsuccessful. Fixes: 4badf2eb1e98 ("cpufreq: amd-pstate: Add ->fast_switch() callback") Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> --- drivers/cpufreq/amd-pstate.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)