[PATCH v6 6/7] cpufreq/cppc: Set the frequency used for computing the capacity
From: Vincent Guittot <vincent.guittot@linaro.org>
Date: 2023-11-09 10:15:18
Also in:
linux-acpi, linux-pm, linux-riscv, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, generic architecture topology, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Sudeep Holla, Linus Torvalds
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> Acked-by: Sudeep Holla <redacted> --- drivers/base/arch_topology.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index e8d1cdf1f761..0a2e43728286 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c@@ -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");
--
2.34.1
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