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cpufreq/amd-pstate: Modify the min_perf calculation in adjust_perf callback

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Instead of setting a fixed floor at lowest_nonlinear_perf, use the
min_limit_perf value, so that it gives the user the freedom to lower the
floor further.

There are two minimum frequency/perf limits that we need to consider in
the adjust_perf callback. One provided by schedutil i.e. the sg_cpu->bw_min
value passed in _min_perf arg, another is the effective value of
min_freq_qos request that is updated in cpudata->min_limit_perf. Modify the
code to use the bigger of these two values.

Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Link: https://lore.kernel.org/r/20250205112523.201101-4-dhananjay.ugwekar@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Dhananjay Ugwekar 2025-02-05 11:25:14 +00:00 committed by Mario Limonciello
parent d082ecbc71
commit 6ceb877d5c
1 changed files with 6 additions and 6 deletions
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12
drivers/cpufreq/amd-pstate.c
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@ -672,7 +672,7 @@ 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, min_limit_perf;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata;
@ -684,20 +684,20 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (policy->min != cpudata->min_limit_freq || policy->max != cpudata->max_limit_freq)
amd_pstate_update_min_max_limit(policy);
cap_perf = READ_ONCE(cpudata->highest_perf);
lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
min_limit_perf = READ_ONCE(cpudata->min_limit_perf);
des_perf = cap_perf;
if (target_perf < capacity)
des_perf = DIV_ROUND_UP(cap_perf * target_perf, capacity);
min_perf = READ_ONCE(cpudata->lowest_perf);
if (_min_perf < capacity)
min_perf = DIV_ROUND_UP(cap_perf * _min_perf, capacity);
else
min_perf = cap_perf;
if (min_perf < lowest_nonlinear_perf)
min_perf = lowest_nonlinear_perf;
if (min_perf < min_limit_perf)
min_perf = min_limit_perf;
max_perf = cpudata->max_limit_perf;
if (max_perf < min_perf)