[PATCH v4 02/19] cpufreq/amd-pstate: Show a warning when a CPU fails to setup

Mario Limonciello
2025-02-19T21:03:19Z

I came across a system that MSR_AMD_CPPC_CAP1 for some CPUs isn't
populated. This is an unexpected behavior that is most likely a
BIOS bug. In the event it happens I'd like users to report bugs
to properly root cause and get this fixed.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
drivers/cpufreq/amd-pstate.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 12fb63169a24c..87c605348a3dc 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1034,6 +1034,7 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
free_cpudata2:
freq_qos_remove_request(&cpudata->req[0]);
free_cpudata1:
+ pr_warn("Failed to initialize CPU %d: %d\n", policy->cpu, ret);
kfree(cpudata);
return ret;
}
@@ -1527,6 +1528,7 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
return 0;

free_cpudata1:
+ pr_warn("Failed to initialize CPU %d: %d\n", policy->cpu, ret);
kfree(cpudata);
return ret;
}
--
2.43.0