From 222e951b8692f2422b8cb7fc096cf45acb8db461 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 19 Jun 2026 16:52:08 +0200 Subject: cpufreq: intel_pstate: Adjust the .adjust_perf() driver callback In some cases, the processor may not actually stick to the "desired" performance level programmed through the driver's .adjust_perf() callback and may go above it, which may not be desirable (for instance, there may be a UCLAMP_MAX limit set for the task currently running on the given CPU which should be respected). Address that by adjusting the .adjust_perf() callback to take an additional argument, max_perf, representing the maximum allowed performance level of the CPU and update the intel_pstate driver to take that argument into account as appropriate. Accordingly, adjust cpufreq_driver_adjust_perf() and the other existing user of .adjust_perf(), which is the amd-pstate driver (but the behavior of that driver is not changed). While at it, also update the cpufreq_driver_adjust_perf() documentation to reflect this change and some previous code changes that have not been taken into account in it. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar Reviewed-by: Zhongqiu Han Reviewed-by: Mario Limonciello (AMD) Link: https://patch.msgid.link/6277654.lOV4Wx5bFT@rafael.j.wysocki [ rjw: Adjusted Rust function formatting ] Signed-off-by: Rafael J. Wysocki --- include/linux/cpufreq.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index ae9d1ce4f49c..35ce665edfd8 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -379,6 +379,7 @@ struct cpufreq_driver { void (*adjust_perf)(struct cpufreq_policy *policy, unsigned long min_perf, unsigned long target_perf, + unsigned long max_perf, unsigned long capacity); /* @@ -624,6 +625,7 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, void cpufreq_driver_adjust_perf(struct cpufreq_policy *policy, unsigned long min_perf, unsigned long target_perf, + unsigned long max_perf, unsigned long capacity); bool cpufreq_driver_has_adjust_perf(void); int cpufreq_driver_target(struct cpufreq_policy *policy, -- cgit v1.2.3