Re: [PATCH 2/3] arch_topology: obtain cpu capacity using information from CPPC
From: Valentin Schneider <hidden>
Date: 2021-05-18 13:12:20
Also in:
linux-acpi, lkml
On 14/05/21 10:53, Ionela Voinescu wrote:
+#ifdef CONFIG_ACPI_CPPC_LIB
+#include <acpi/cppc_acpi.h>
+
+void init_cpu_capacity_cppc(void)
+{
+ struct cppc_perf_caps perf_caps;
+ int cpu;
+
+ if (likely(acpi_disabled || !acpi_cpc_valid()))
+ return;
+
+ raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
+ GFP_KERNEL);Per the below loop, the memory shouldn't need to be cleared.
+ if (!raw_capacity)
+ return;
+
+ for_each_possible_cpu(cpu) {
+ if (!cppc_get_perf_caps(cpu, &perf_caps)) {
+ raw_capacity[cpu] = perf_caps.highest_perf;
+ pr_debug("%s: CPU%d cpu_capacity=%u (raw).\n",
+ __func__, cpu, raw_capacity[cpu]);
+ } else {
+ pr_err("%s: CPU%d missing highest performance.\n",
+ __func__, cpu);
+ pr_err("%s: fallback to 1024 for all CPUs\n",
+ __func__);
+ goto exit;
+ }
+ }
+
+ topology_normalize_cpu_scale();
+ schedule_work(&update_topology_flags_work);
+ pr_debug("%s: cpu_capacity initialization done\n", __func__);
+
+exit:
+ free_raw_capacity();
+}
+#endif_______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel