linux-kernel - [tip: x86/platform] platform/x86: hfi: Init per-cpu scores for each class

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Message-ID: <175196903829.406.16120672533728371829.tip-bot2@tip-bot2>
Date: Tue, 08 Jul 2025 10:03:58 -0000
From: "tip-bot2 for Perry Yuan" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Perry Yuan <Perry.Yuan@....com>,
 Mario Limonciello <mario.limonciello@....com>,
 "Borislav Petkov (AMD)" <bp@...en8.de>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>, ilpo.jarvinen@...ux.intel.com,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: x86/platform] platform/x86: hfi: Init per-cpu scores for each class

The following commit has been merged into the x86/platform branch of tip:

Commit-ID:     b6ffe4d9e074561f95a728e1f822ed15e533ec6e
Gitweb:        https://git.kernel.org/tip/b6ffe4d9e074561f95a728e1f822ed15e533ec6e
Author:        Perry Yuan <Perry.Yuan@....com>
AuthorDate:    Mon, 09 Jun 2025 15:05:11 -05:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 07 Jul 2025 21:19:17 +02:00

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@....com>
Co-developed-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Link: https://lore.kernel.org/20250609200518.3616080-7-superm1@kernel.org
---
 drivers/platform/x86/amd/hfi/hfi.c | 29 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+)

diff --git a/drivers/platform/x86/amd/hfi/hfi.c b/drivers/platform/x86/amd/hfi/hfi.c
index 690b7b1..b10bd96 100644
--- a/drivers/platform/x86/amd/hfi/hfi.c
+++ b/drivers/platform/x86/amd/hfi/hfi.c
@@ -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;
 }