linux-kernel - [PATCH v4 07/13] platform/x86: hfi: init per-cpu scores for each class

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Message-ID: <20241021180252.3531-8-mario.limonciello@amd.com>
Date: Mon, 21 Oct 2024 13:02:46 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Borislav Petkov <bp@...en8.de>, Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC: <x86@...nel.org>, "Gautham R . Shenoy" <gautham.shenoy@....com>, "Mario
 Limonciello" <mario.limonciello@....com>, Perry Yuan <perry.yuan@....com>,
	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <platform-driver-x86@...r.kernel.org>, "Shyam
 Sundar S K" <Shyam-sundar.S-k@....com>, Perry Yuan <Perry.Yuan@....com>
Subject: [PATCH v4 07/13] platform/x86: hfi: init per-cpu scores for each class

From: Perry Yuan <Perry.Yuan@....com>

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

`Classic core` and `Dense core` 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.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Signed-off-by: Perry Yuan <Perry.Yuan@....com>
Co-developed-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
v2->v3:
 * Drop jump label (Ilpo)
---
 drivers/platform/x86/amd/hfi/hfi.c | 31 ++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/platform/x86/amd/hfi/hfi.c b/drivers/platform/x86/amd/hfi/hfi.c
index b5cfe20c11052..986ea056fa022 100644
--- a/drivers/platform/x86/amd/hfi/hfi.c
+++ b/drivers/platform/x86/amd/hfi/hfi.c
@@ -114,6 +114,8 @@ struct amd_hfi_cpuinfo {
 
 static DEFINE_PER_CPU(struct amd_hfi_cpuinfo, amd_hfi_cpuinfo) = {.class_index = -1};
 
+static DEFINE_MUTEX(hfi_cpuinfo_lock);
+
 static int find_cpu_index_by_apicid(unsigned int target_apicid)
 {
 	int cpu_index;
@@ -234,6 +236,31 @@ static void amd_hfi_remove(struct platform_device *pdev)
 	mutex_destroy(&dev->lock);
 }
 
+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_present_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)
 {
@@ -317,6 +344,10 @@ static int amd_hfi_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = update_hfi_ipcc_scores();
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
-- 
2.43.0