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drm/i915/selftest: Add throttle reason diagnostics to RPS selftests

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Report GPU throttle reasons when RPS tests fail to reach expected
frequencies or power levels.

v2: Read the throttle value before the spinner ends (Raag)
    Add a condition before printing throttle value (Krzysztof)
v3: Extend throttle reasons debug support (Raag)
v4: Cosmetic changes (Raag)

Signed-off-by: Sk Anirban <sk.anirban@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
Link: https://patch.msgid.link/20251223101605.3304379-2-sk.anirban@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
This commit is contained in:
Sk Anirban 2025-12-23 15:46:06 +05:30 committed by Matt Roper
parent 78df43b958
commit 043fc9e961
1 changed files with 29 additions and 5 deletions
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34
drivers/gpu/drm/i915/gt/selftest_rps.c
View File

@ -378,6 +378,7 @@ int live_rps_control(void *arg)
enum intel_engine_id id;
struct igt_spinner spin;
intel_wakeref_t wakeref;
u32 throttle;
int err = 0;
/*
@ -463,6 +464,9 @@ int live_rps_control(void *arg)
max = rps_set_check(rps, limit);
max_dt = ktime_sub(ktime_get(), max_dt);
throttle = intel_uncore_read(gt->uncore, intel_gt_perf_limit_reasons_reg(gt));
throttle &= GT0_PERF_LIMIT_REASONS_MASK;
min_dt = ktime_get();
min = rps_set_check(rps, rps->min_freq);
min_dt = ktime_sub(ktime_get(), min_dt);
@ -478,11 +482,9 @@ int live_rps_control(void *arg)
min, max, ktime_to_ns(min_dt), ktime_to_ns(max_dt));
if (limit != rps->max_freq) {
u32 throttle = intel_uncore_read(gt->uncore,
intel_gt_perf_limit_reasons_reg(gt));
pr_warn("%s: GPU throttled with reasons 0x%08x\n",
engine->name, throttle & GT0_PERF_LIMIT_REASONS_MASK);
if (throttle)
pr_warn("%s: GPU throttled with reasons 0x%08x\n",
engine->name, throttle);
show_pstate_limits(rps);
}
@ -1138,6 +1140,7 @@ int live_rps_power(void *arg)
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct igt_spinner spin;
u32 throttle;
int err = 0;
/*
@ -1195,6 +1198,9 @@ int live_rps_power(void *arg)
max.freq = rps->max_freq;
max.power = measure_power_at(rps, &max.freq);
throttle = intel_uncore_read(gt->uncore, intel_gt_perf_limit_reasons_reg(gt));
throttle &= GT0_PERF_LIMIT_REASONS_MASK;
min.freq = rps->min_freq;
min.power = measure_power_at(rps, &min.freq);
@ -1210,12 +1216,21 @@ int live_rps_power(void *arg)
pr_notice("Could not control frequency, ran at [%d:%uMHz, %d:%uMhz]\n",
min.freq, intel_gpu_freq(rps, min.freq),
max.freq, intel_gpu_freq(rps, max.freq));
if (throttle)
pr_warn("%s: GPU throttled with reasons 0x%08x\n",
engine->name, throttle);
continue;
}
if (11 * min.power > 10 * max.power) {
pr_err("%s: did not conserve power when setting lower frequency!\n",
engine->name);
if (throttle)
pr_warn("%s: GPU throttled with reasons 0x%08x\n",
engine->name, throttle);
err = -EINVAL;
break;
}
@ -1241,6 +1256,7 @@ int live_rps_dynamic(void *arg)
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct igt_spinner spin;
u32 throttle;
int err = 0;
/*
@ -1293,6 +1309,9 @@ int live_rps_dynamic(void *arg)
max.freq = wait_for_freq(rps, rps->max_freq, 500);
max.dt = ktime_sub(ktime_get(), max.dt);
throttle = intel_uncore_read(gt->uncore, intel_gt_perf_limit_reasons_reg(gt));
throttle &= GT0_PERF_LIMIT_REASONS_MASK;
igt_spinner_end(&spin);
min.dt = ktime_get();
@ -1308,6 +1327,11 @@ int live_rps_dynamic(void *arg)
if (min.freq >= max.freq) {
pr_err("%s: dynamic reclocking of spinner failed\n!",
engine->name);
if (throttle)
pr_warn("%s: GPU throttled with reasons 0x%08x\n",
engine->name, throttle);
err = -EINVAL;
}