Merge: cpufreq: intel_pstate: Update asym capacity for CPUs that were offline initially

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/5935

JIRA: https://issues.redhat.com/browse/RHEL-68120

Build Info:  https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66095055

Tested: Successful platform test results on Intel (intel-arrowlake-h-01) system.

commit 92447aa
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date:   Mon Nov 4 19:53:53 2024 +0100

    cpufreq: intel_pstate: Update asym capacity for CPUs that were offline initially

    Commit 929ebc9 ("cpufreq: intel_pstate: Set asymmetric CPU
    capacity on hybrid systems") overlooked a corner case in which some
    CPUs may be offline to start with and brought back online later,
    after the intel_pstate driver has been registered, so their asymmetric
    capacity will not be set.

    Address this by calling hybrid_update_capacity() in the CPU
    initialization path that is executed instead of the online path
    for those CPUs.

    Note that this asymmetric capacity update will be skipped during
    driver initialization and mode switches because hybrid_max_perf_cpu
    is NULL in those cases.

    Fixes: 929ebc9 ("cpufreq: intel_pstate: Set asymmetric CPU capacity on hybrid systems")
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Link: https://patch.msgid.link/1913414.tdWV9SEqCh@rjwysocki.net

Signed-off-by: Steve Best <sbest@redhat.com>

Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: David Arcari <darcari@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Rado Vrbovsky <rvrbovsk@redhat.com>

Author: emmil

drivers/cpufreq/intel_pstate.c

@@ -2261,6 +2261,11 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
 		} else {
 			cpu->pstate.scaling = perf_ctl_scaling;
 		}
+		/*
+		 * If the CPU is going online for the first time and it was
+		 * offline initially, asym capacity scaling needs to be updated.
+		 */
+		hybrid_update_capacity(cpu);
 	} else {
 		cpu->pstate.scaling = perf_ctl_scaling;
 		cpu->pstate.max_pstate = pstate_funcs.get_max(cpu->cpu);