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cpufreq/cppc: Set the frequency used for computing the capacity

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commit 5477fa249b56c59c3baa1b237bf083cffa64c84a upstream.

Save the frequency associated to the performance that has been used when
initializing the capacity of CPUs.

Also, cppc cpufreq driver can register an artificial energy model. In such
case, it needs the frequency for this compute capacity.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Pierre Gondois <pierre.gondois@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20231211104855.558096-7-vincent.guittot@linaro.org
Stable-dep-of: e37617c8e53a ("sched/fair: Fix frequency selection for non-invariant case")
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vincent Guittot
2023-12-11 11:48:54 +01:00
committed by Greg Kroah-Hartman
parent 11da2b1ae4
commit cf4faefd3a
1 changed files with 14 additions and 1 deletions
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15
drivers/base/arch_topology.c
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@@ -349,6 +349,7 @@ bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
void topology_init_cpu_capacity_cppc(void)
{
u64 capacity, capacity_scale = 0;
struct cppc_perf_caps perf_caps;
int cpu;
@@ -365,6 +366,10 @@ void topology_init_cpu_capacity_cppc(void)
(perf_caps.highest_perf >= perf_caps.nominal_perf) &&
(perf_caps.highest_perf >= perf_caps.lowest_perf)) {
raw_capacity[cpu] = perf_caps.highest_perf;
capacity_scale = max_t(u64, capacity_scale, raw_capacity[cpu]);
per_cpu(capacity_freq_ref, cpu) = cppc_perf_to_khz(&perf_caps, raw_capacity[cpu]);
pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n",
cpu, raw_capacity[cpu]);
continue;
@@ -375,7 +380,15 @@ void topology_init_cpu_capacity_cppc(void)
goto exit;
}
topology_normalize_cpu_scale();
for_each_possible_cpu(cpu) {
capacity = raw_capacity[cpu];
capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
capacity_scale);
topology_set_cpu_scale(cpu, capacity);
pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
cpu, topology_get_cpu_scale(cpu));
}
schedule_work(&update_topology_flags_work);
pr_debug("cpu_capacity: cpu_capacity initialization done\n");