Commit b6ffe4d9 authored Jun 09, 2025 by Perry Yuan Committed by Borislav Petkov (AMD) Jul 07, 2025

platform/x86: hfi: Init per-cpu scores for each class



Initialize per CPU score `amd_hfi_ipcc_scores` which store energy score
and performance score data for each class.

Classic and dense cores are ranked according to those values as energy
efficiency capability or performance capability.  OS scheduler will pick cores
from the ranking list on each class ID for the thread which provide the class
id got from hardware feedback interface.

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Co-developed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/20250609200518.3616080-7-superm1@kernel.org

parent d4e95ea7

drivers/platform/x86/amd/hfi/hfi.c

+29 −0

Original line number	Diff line number	Diff line
		@@ -228,6 +228,31 @@ static int amd_hfi_alloc_class_data(struct platform_device *pdev)
		return 0;
		}

		static int amd_set_hfi_ipcc_score(struct amd_hfi_cpuinfo *hfi_cpuinfo, int cpu)
		{
		for (int i = 0; i < hfi_cpuinfo->nr_class; i++)
		WRITE_ONCE(hfi_cpuinfo->ipcc_scores[i],
		hfi_cpuinfo->amd_hfi_classes[i].perf);

		return 0;
		}

		static int update_hfi_ipcc_scores(void)
		{
		int cpu;
		int ret;

		for_each_possible_cpu(cpu) {
		struct amd_hfi_cpuinfo *hfi_cpuinfo = per_cpu_ptr(&amd_hfi_cpuinfo, cpu);

		ret = amd_set_hfi_ipcc_score(hfi_cpuinfo, cpu);
		if (ret)
		return ret;
		}

		return 0;
		}

		static int amd_hfi_metadata_parser(struct platform_device *pdev,
		struct amd_hfi_data *amd_hfi_data)
		{
		@@ -310,6 +335,10 @@ static int amd_hfi_probe(struct platform_device *pdev)
		if (ret)
		return ret;

		ret = update_hfi_ipcc_scores();
		if (ret)
		return ret;

		return 0;
		}