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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>, Wyes Karny <wyes.karny@amd.com>,
	Perry Yuan <perry.yuan@amd.com>
Subject: [PATCH V14 2/7] ACPI: CPPC: Add get the highest performance cppc control
Date: Fri, 19 Jan 2024 17:04:57 +0800	[thread overview]
Message-ID: <20240119090502.3869695-3-li.meng@amd.com> (raw)
In-Reply-To: <20240119090502.3869695-1-li.meng@amd.com>

Add support for getting the highest performance to the
generic CPPC driver. This enables downstream drivers
such as amd-pstate to discover and use these values.

Please refer to Chapter 8.4.6.1.1.1. Highest Performance
of ACPI Specification 6.5 for details on continuous
performance control of CPPC. Also see the Link below.

Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Wyes Karny <wyes.karny@amd.com>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Meng Li <li.meng@amd.com>
Link: https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html?highlight=cppc#highest-performance
---
 drivers/acpi/cppc_acpi.c | 13 +++++++++++++
 include/acpi/cppc_acpi.h |  5 +++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index d155a86a8614..a50e70abdf19 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1157,6 +1157,19 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
 	return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf);
 }
 
+/**
+ * cppc_get_highest_perf - Get the highest performance register value.
+ * @cpunum: CPU from which to get highest performance.
+ * @highest_perf: Return address.
+ *
+ * Return: 0 for success, -EIO otherwise.
+ */
+int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
+{
+	return cppc_get_perf(cpunum, HIGHEST_PERF, highest_perf);
+}
+EXPORT_SYMBOL_GPL(cppc_get_highest_perf);
+
 /**
  * cppc_get_epp_perf - Get the epp register value.
  * @cpunum: CPU from which to get epp preference value.
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index 3a0995f8bce8..930b6afba6f4 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -139,6 +139,7 @@ struct cppc_cpudata {
 #ifdef CONFIG_ACPI_CPPC_LIB
 extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
 extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
+extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf);
 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 extern int cppc_set_enable(int cpu, bool enable);
@@ -167,6 +168,10 @@ static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
 {
 	return -ENOTSUPP;
 }
+static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
+{
+	return -ENOTSUPP;
+}
 static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
 {
 	return -ENOTSUPP;
-- 
2.34.1


  parent reply	other threads:[~2024-01-19  9:05 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-19  9:04 [PATCH V14 0/7] amd-pstate preferred core Meng Li
2024-01-19  9:04 ` [PATCH V14 1/7] x86: Drop CPU_SUP_INTEL from SCHED_MC_PRIO for the expansion Meng Li
2024-01-19  9:04 ` Meng Li [this message]
2024-01-19  9:04 ` [PATCH V14 3/7] cpufreq: amd-pstate: Enable amd-pstate preferred core supporting Meng Li
2024-01-19  9:04 ` [PATCH V14 4/7] cpufreq: Add a notification message that the highest perf has changed Meng Li
2024-01-19  9:05 ` [PATCH V14 5/7] cpufreq: amd-pstate: Update amd-pstate preferred core ranking dynamically Meng Li
2024-01-19  9:05 ` [PATCH V14 6/7] Documentation: amd-pstate: introduce amd-pstate preferred core Meng Li
2024-01-19  9:05 ` [PATCH V14 7/7] Documentation: introduce amd-pstate preferrd core mode kernel command line options Meng Li
2024-01-29 15:18 ` [PATCH V14 0/7] amd-pstate preferred core Rafael J. Wysocki
2024-01-29 15:33   ` Borislav Petkov
2024-01-31 13:58     ` Rafael J. Wysocki
2024-02-18 16:10       ` Lucas Lee Jing Yi
2024-02-18 16:10         ` [PATCH] [PATCH] amd_pstate: fix erroneous highest_perf value on some CPUs Lucas Lee Jing Yi
2024-02-20  7:23           ` Meng, Li (Jassmine)
2024-02-20  9:02           ` Oleksandr Natalenko
2024-02-21 17:19             ` Lucas Lee Jing Yi
2024-02-21 17:19               ` Lucas Lee Jing Yi
2024-02-21 18:47                 ` Mario Limonciello
2024-02-19  1:02         ` [PATCH V14 0/7] amd-pstate preferred core Meng, Li (Jassmine)

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