Received-SPF: pass (google.com: domain of linux-kernel+bounces-12500-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
From: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
To: <rafael@kernel.org>, <lenb@kernel.org>, <robert.moore@intel.com>,
	<linux-acpi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<acpica-devel@lists.linux.dev>, <tglx@linutronix.de>, <mingo@redhat.com>,
	<bp@alien8.de>, <dave.hansen@linux.intel.com>, <x86@kernel.org>,
	<hpa@zytor.com>, <mcgrof@kernel.org>, <peterz@infradead.org>,
	<j.granados@samsung.com>, <TonyWWang-oc@zhaoxin.com>,
	<ricardo.neri-calderon@linux.intel.com>, <viresh.kumar@linaro.org>,
	<linux-pm@vger.kernel.org>
CC: <CobeChen@zhaoxin.com>, <TimGuo@zhaoxin.com>, <LeoLiu-oc@zhaoxin.com>,
	<LindaChai@zhaoxin.com>
Subject: [PATCH 1/3] ACPI: CPPC: Add get the highest perf register value support
Date: Thu, 28 Dec 2023 15:57:03 +0800
Message-ID: <20231228075705.26652-2-TonyWWang-oc@zhaoxin.com>
In-Reply-To: <20231228075705.26652-1-TonyWWang-oc@zhaoxin.com>
References: <20231228075705.26652-1-TonyWWang-oc@zhaoxin.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain

Add function cppc_get_highest_perf in generic CPPC driver to get the
highest perf register value for specified core.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
---
 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 7ff269a78c20..1a77c514d007 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1154,6 +1154,19 @@ 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 6126c977ece0..c0b69ffe7bdb 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);
@@ -165,6 +166,10 @@ 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;
-- 
2.25.1