linux-kernel - [RFC PATCH 1/4] cpufreq: acpi-cpufreq: Re-factor overriding ACPI PSD

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Date:   Wed, 25 Nov 2020 23:48:44 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     rjw@...ysocki.net
Cc:     Punit Agrawal <punitagrawal@...il.com>, wei.huang2@....com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        bp@...en8.de, x86@...nel.org
Subject: [RFC PATCH 1/4] cpufreq: acpi-cpufreq: Re-factor overriding ACPI PSD

Re-factor the code to override the firmware provided frequency domain
information (via PSD) to localise the checks in one function.

No functional change intended.

Signed-off-by: Punit Agrawal <punitagrawal@...il.com>
Cc: Wei Huang <wei.huang2@....com>
---
 drivers/cpufreq/acpi-cpufreq.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 1e4fbb002a31..b1e7df96d428 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -191,6 +191,20 @@ static int check_amd_hwpstate_cpu(unsigned int cpuid)
 	return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
 }
 
+static int override_acpi_psd(unsigned int cpu_id)
+{
+	struct cpuinfo_x86 *c = &boot_cpu_data;
+
+	if (c->x86_vendor == X86_VENDOR_AMD) {
+		if (!check_amd_hwpstate_cpu(cpu_id))
+			return false;
+
+		return c->x86 < 0x19;
+	}
+
+	return false;
+}
+
 static unsigned extract_io(struct cpufreq_policy *policy, u32 value)
 {
 	struct acpi_cpufreq_data *data = policy->driver_data;
@@ -691,8 +705,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 		cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
 	}
 
-	if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&
-	    !acpi_pstate_strict) {
+	if (override_acpi_psd(cpu) && !acpi_pstate_strict) {
 		cpumask_clear(policy->cpus);
 		cpumask_set_cpu(cpu, policy->cpus);
 		cpumask_copy(data->freqdomain_cpus,
-- 
2.29.2