| Message ID | 20230518055819.71585-1-wyes.karny@amd.com |
|---|---|
| State | Accepted |
| Commit | 3bf8c6307bad5c0cc09cde982e146d847859b651 |
| Headers | show |
| Series | cpufreq: amd-pstate: Update policy->cur for adjust perf | expand |
Hi Rafael, On 24 May 19:57, Rafael J. Wysocki wrote: > On Thu, May 18, 2023 at 7:58 AM Wyes Karny <wyes.karny@amd.com> wrote: > > > > Driver should update policy->cur after updating the frequency. > > Currently amd_pstate doesn't update policy->cur when `adjust_perf` > > is used. Which causes /proc/cpuinfo to show wrong cpu frequency. > > Fix this by updating policy->cur with correct frequency value in > > adjust_perf function callback. > > > > - Before the fix: (setting min freq to 1.5 MHz) > > > > [root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count > > 1 cpu MHz : 1777.016 > > 1 cpu MHz : 1797.160 > > 1 cpu MHz : 1797.270 > > 189 cpu MHz : 400.000 > > > > - After the fix: (setting min freq to 1.5 MHz) > > > > [root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count > > 1 cpu MHz : 1753.353 > > 1 cpu MHz : 1756.838 > > 1 cpu MHz : 1776.466 > > 1 cpu MHz : 1776.873 > > 1 cpu MHz : 1777.308 > > 1 cpu MHz : 1779.900 > > 183 cpu MHz : 1805.231 > > 1 cpu MHz : 1956.815 > > 1 cpu MHz : 2246.203 > > 1 cpu MHz : 2259.984 > > > > Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State") > > > > Signed-off-by: Wyes Karny <wyes.karny@amd.com> > > --- > > drivers/cpufreq/amd-pstate.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > > index 5a3d4aa0f45a..736dab69ba1e 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -479,12 +479,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu, > > unsigned long capacity) > > { > > unsigned long max_perf, min_perf, des_perf, > > - cap_perf, lowest_nonlinear_perf; > > + cap_perf, lowest_nonlinear_perf, max_freq; > > struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); > > struct amd_cpudata *cpudata = policy->driver_data; > > + unsigned int target_freq; > > > > cap_perf = READ_ONCE(cpudata->highest_perf); > > lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); > > + max_freq = READ_ONCE(cpudata->max_freq); > > > > des_perf = cap_perf; > > if (target_perf < capacity) > > @@ -501,6 +503,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu, > > if (max_perf < min_perf) > > max_perf = min_perf; > > > > + des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf); > > + target_freq = div_u64(des_perf * max_freq, max_perf); > > + policy->cur = target_freq; > > + > > amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true, > > policy->governor->flags); > > cpufreq_cpu_put(policy); > > -- > > Applied under an edited subject, thanks! > > I think you'd like this to go into 6.4 and "stable", right? Yes, please. I should have added stable tag. Thanks & Regards, Wyes
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 5a3d4aa0f45a..736dab69ba1e 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -479,12 +479,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu, unsigned long capacity) { unsigned long max_perf, min_perf, des_perf, - cap_perf, lowest_nonlinear_perf; + cap_perf, lowest_nonlinear_perf, max_freq; struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); struct amd_cpudata *cpudata = policy->driver_data; + unsigned int target_freq; cap_perf = READ_ONCE(cpudata->highest_perf); lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); + max_freq = READ_ONCE(cpudata->max_freq); des_perf = cap_perf; if (target_perf < capacity) @@ -501,6 +503,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu, if (max_perf < min_perf) max_perf = min_perf; + des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf); + target_freq = div_u64(des_perf * max_freq, max_perf); + policy->cur = target_freq; + amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true, policy->governor->flags); cpufreq_cpu_put(policy);
Driver should update policy->cur after updating the frequency. Currently amd_pstate doesn't update policy->cur when `adjust_perf` is used. Which causes /proc/cpuinfo to show wrong cpu frequency. Fix this by updating policy->cur with correct frequency value in adjust_perf function callback. - Before the fix: (setting min freq to 1.5 MHz) [root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count 1 cpu MHz : 1777.016 1 cpu MHz : 1797.160 1 cpu MHz : 1797.270 189 cpu MHz : 400.000 - After the fix: (setting min freq to 1.5 MHz) [root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count 1 cpu MHz : 1753.353 1 cpu MHz : 1756.838 1 cpu MHz : 1776.466 1 cpu MHz : 1776.873 1 cpu MHz : 1777.308 1 cpu MHz : 1779.900 183 cpu MHz : 1805.231 1 cpu MHz : 1956.815 1 cpu MHz : 2246.203 1 cpu MHz : 2259.984 Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State") Signed-off-by: Wyes Karny <wyes.karny@amd.com> --- drivers/cpufreq/amd-pstate.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)