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From: Meng Li <li.meng@amd.com>
To: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>, Borislav Petkov
	<bpetkov@amd.com>, Huang Rui <ray.huang@amd.com>
CC: <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<x86@kernel.org>, <linux-acpi@vger.kernel.org>, Shuah Khan
	<skhan@linuxfoundation.org>, <linux-kselftest@vger.kernel.org>, "Nathan
 Fontenot" <nathan.fontenot@amd.com>, Deepak Sharma <deepak.sharma@amd.com>,
	Alex Deucher <alexander.deucher@amd.com>, Mario Limonciello
	<mario.limonciello@amd.com>, Shimmer Huang <shimmer.huang@amd.com>, "Perry
 Yuan" <Perry.Yuan@amd.com>, Xiaojian Du <Xiaojian.Du@amd.com>, Viresh Kumar
	<viresh.kumar@linaro.org>, Borislav Petkov <bp@alien8.de>, "Oleksandr
 Natalenko" <oleksandr@natalenko.name>, Meng Li <li.meng@amd.com>, Perry Yuan
	<perry.yuan@amd.com>
Subject: [PATCH V14 4/7] cpufreq: Add a notification message that the highest perf has changed
Date: Fri, 19 Jan 2024 17:04:59 +0800
Message-ID: <20240119090502.3869695-5-li.meng@amd.com>
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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@natalenko.name>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Meng Li <li.meng@amd.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 ++++++
 include/linux/cpufreq.h         | 1 +
 2 files changed, 7 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;
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index afda5f24d3dd..9bebeec24abb 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -263,6 +263,7 @@ static inline bool cpufreq_supports_freq_invariance(void)
 	return false;
 }
 static inline void disable_cpufreq(void) { }
+static inline void cpufreq_update_limits(unsigned int cpu) { }
 #endif
 
 #ifdef CONFIG_CPU_FREQ_STAT
-- 
2.34.1