linux-kernel - [PATCH V13 4/7] cpufreq: Add a notification message that the highest perf has changed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240112092531.789841-5-li.meng@amd.com>
Date: Fri, 12 Jan 2024 17:25:28 +0800
From: Meng Li <li.meng@....com>
To: "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Borislav Petkov
	<bpetkov@....com>, Huang Rui <ray.huang@....com>
CC: <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, <linux-acpi@...r.kernel.org>, Shuah Khan
	<skhan@...uxfoundation.org>, <linux-kselftest@...r.kernel.org>, "Nathan
 Fontenot" <nathan.fontenot@....com>, Deepak Sharma <deepak.sharma@....com>,
	Alex Deucher <alexander.deucher@....com>, Mario Limonciello
	<mario.limonciello@....com>, Shimmer Huang <shimmer.huang@....com>, "Perry
 Yuan" <Perry.Yuan@....com>, Xiaojian Du <Xiaojian.Du@....com>, Viresh Kumar
	<viresh.kumar@...aro.org>, Borislav Petkov <bp@...en8.de>, "Oleksandr
 Natalenko" <oleksandr@...alenko.name>, Meng Li <li.meng@....com>, Perry Yuan
	<perry.yuan@....com>
Subject: [PATCH V13 4/7] cpufreq: Add a notification message that the highest perf has changed

BIOS issues the notify 0x85 to OS that the highest performance
changed. And it will affect the ranking of the preferred core.
AMD-pstate driver will set the priority of cores based on the
preferred core ranking.

Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Huang Rui <ray.huang@....com>
Reviewed-by: Perry Yuan <perry.yuan@....com>
Signed-off-by: Meng Li <li.meng@....com>
Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#processor-device-notification-values
---
 drivers/acpi/processor_driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 4bd16b3f0781..67db60eda370 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -27,6 +27,7 @@
 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
 #define ACPI_PROCESSOR_NOTIFY_POWER	0x81
 #define ACPI_PROCESSOR_NOTIFY_THROTTLING	0x82
+#define ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED	0x85
 
 MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI Processor Driver");
@@ -83,6 +84,11 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 		acpi_bus_generate_netlink_event(device->pnp.device_class,
 						  dev_name(&device->dev), event, 0);
 		break;
+	case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED:
+		cpufreq_update_limits(pr->id);
+		acpi_bus_generate_netlink_event(device->pnp.device_class,
+						  dev_name(&device->dev), event, 0);
+		break;
 	default:
 		acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
 		break;
-- 
2.34.1