[Intel-gfx] [PATCH v2] drm/i915/guc: Dump perf_limit_reasons for debug

[Dixit, Ashutosh]

On Tue, 27 Jun 2023 12:13:36 -0700, Vinay Belgaumkar wrote:
>
> GuC load takes longer sometimes due to GT frequency not ramping up.
> Add perf_limit_reasons to the existing warn print to see if frequency
> is being throttled.
>
> v2: Review comments (Ashutosh)

Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>

>
> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
> index 364d0d546ec8..0f79cb658518 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
> @@ -251,9 +251,11 @@ static int guc_wait_ucode(struct intel_guc *guc)
>		if (ret == 0)
>			ret = -ENXIO;
>	} else if (delta_ms > 200) {
> -		guc_warn(guc, "excessive init time: %lldms! [freq = %dMHz, before = %dMHz, status = 0x%08X, count = %d, ret = %d]\n",
> -			 delta_ms, intel_rps_read_actual_frequency(&uncore->gt->rps),
> -			 before_freq, status, count, ret);
> +		guc_warn(guc, "excessive init time: %lldms! [status = 0x%08X, count = %d, ret = %d]\n",
> +			 delta_ms, status, count, ret);
> +		guc_warn(guc, "excessive init time: [freq = %dMHz, before = %dMHz, perf_limit_reasons = 0x%08X]\n",
> +			 intel_rps_read_actual_frequency(&uncore->gt->rps), before_freq,
> +			 intel_uncore_read(uncore, intel_gt_perf_limit_reasons_reg(gt)));
>	} else {
>		guc_dbg(guc, "init took %lldms, freq = %dMHz, before = %dMHz, status = 0x%08X, count = %d, ret = %d\n",
>			delta_ms, intel_rps_read_actual_frequency(&uncore->gt->rps),
> --
> 2.38.1
>