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amd-pstate: Introduce a tracepoint trace_amd_pstate_cppc_req2()

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Introduce a new tracepoint trace_amd_pstate_cppc_req2() to track
updates to MSR_AMD_CPPC_REQ2.

Invoke this while changing the Floor Perf.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
This commit is contained in:
Gautham R. Shenoy
2026-04-02 11:28:31 -05:00
committed by Mario Limonciello (AMD)
parent b9f103d096
commit 30c63f7234
2 changed files with 46 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/cpufreq/amd-pstate-trace.h
+35
View File
@@ -133,6 +133,41 @@ TRACE_EVENT(amd_pstate_epp_perf,
)
);
TRACE_EVENT(amd_pstate_cppc_req2,
TP_PROTO(unsigned int cpu_id,
u8 floor_perf,
bool changed,
int err_code
),
TP_ARGS(cpu_id,
floor_perf,
changed,
err_code),
TP_STRUCT__entry(
__field(unsigned int, cpu_id)
__field(u8, floor_perf)
__field(bool, changed)
__field(int, err_code)
),
TP_fast_assign(
__entry->cpu_id = cpu_id;
__entry->floor_perf = floor_perf;
__entry->changed = changed;
__entry->err_code = err_code;
),
TP_printk("cpu%u: floor_perf=%u, changed=%u (error = %d)",
__entry->cpu_id,
__entry->floor_perf,
__entry->changed,
__entry->err_code
)
);
#endif /* _AMD_PSTATE_TRACE_H */
/* This part must be outside protection */
drivers/cpufreq/amd-pstate.c
+11 -3
View File
@@ -333,6 +333,7 @@ static int amd_pstate_set_floor_perf(struct cpufreq_policy *policy, u8 perf)
{
struct amd_cpudata *cpudata = policy->driver_data;
u64 value, prev;
bool changed;
int ret;
if (!cpu_feature_enabled(X86_FEATURE_CPPC_PERF_PRIO))
@@ -341,17 +342,24 @@ static int amd_pstate_set_floor_perf(struct cpufreq_policy *policy, u8 perf)
value = prev = READ_ONCE(cpudata->cppc_req2_cached);
FIELD_MODIFY(AMD_CPPC_FLOOR_PERF_MASK, &value, perf);
if (value == prev)
return 0;
changed = value != prev;
if (!changed) {
ret = 0;
goto out_trace;
}
ret = wrmsrq_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ2, value);
if (ret) {
changed = false;
pr_err("failed to set CPPC REQ2 value. Error (%d)\n", ret);
return ret;
goto out_trace;
}
WRITE_ONCE(cpudata->cppc_req2_cached, value);
out_trace:
if (trace_amd_pstate_cppc_req2_enabled())
trace_amd_pstate_cppc_req2(cpudata->cpu, perf, changed, ret);
return ret;
}