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

[Dixit, Ashutosh]

On Mon, 26 Jun 2023 19:12:18 -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.
> 
> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> 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..73911536a8e7 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fw.c
> @@ -254,6 +254,8 @@ static int guc_wait_ucode(struct intel_guc *guc)
>  		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, "perf limit reasons = 0x%08X\n",
> +			 intel_uncore_read(uncore, intel_gt_perf_limit_reasons_reg(gt)));

Maybe just add at the end of the previous guc_warn?

>  	} 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
>