linux-kernel - [PATCH v3 10/13] cpufreq: amd-pstate: add ACPI disabled check in acpi_cpc

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Date:   Tue, 12 Jul 2022 11:42:23 -0400
From:   Perry Yuan <Perry.Yuan@....com>
To:     <rafael.j.wysocki@...el.com>, <viresh.kumar@...aro.org>,
        <Ray.Huang@....com>
CC:     <Deepak.Sharma@....com>, <Mario.Limonciello@....com>,
        <Nathan.Fontenot@....com>, <Alexander.Deucher@....com>,
        <Jinzhou.Su@....com>, <Xinmei.Huang@....com>,
        <Xiaojian.Du@....com>, <Li.Meng@....com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Perry Yuan <Perry.Yuan@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Huang Rui <ray.huang@....com>,
        <linux-acpi@...r.kernel.org>
Subject: [PATCH v3 10/13] cpufreq: amd-pstate: add ACPI disabled check in acpi_cpc_valid()

Add acpi function check in case ACPI is not enabled, that will cause
pstate driver failed to call cppc acpi to change perf or update epp
value for shared memory solution processors.

When CPPC or ACPI is invalid, warning log will be needed to tell
user that AMD pstate driver failed to load and what is wrong.

Signed-off-by: Perry Yuan <Perry.Yuan@....com>
---
 drivers/acpi/cppc_acpi.c     | 3 +++
 drivers/cpufreq/amd-pstate.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 6ff1901d7d43..17d67e3ededf 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -424,6 +424,9 @@ bool acpi_cpc_valid(void)
 	struct cpc_desc *cpc_ptr;
 	int cpu;
 
+	if (acpi_disabled)
+		return false;
+
 	for_each_present_cpu(cpu) {
 		cpc_ptr = per_cpu(cpc_desc_ptr, cpu);
 		if (!cpc_ptr)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 1e5ca4897b7e..a9918728948a 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -682,7 +682,7 @@ static int __init amd_pstate_init(void)
 		return -ENODEV;
 
 	if (!acpi_cpc_valid()) {
-		pr_debug("the _CPC object is not present in SBIOS\n");
+		pr_warn_once("the _CPC object is not present in SBIOS or ACPI disabled\n");
 		return -ENODEV;
 	}
 
-- 
2.25.1