[PATCH v1] drm/xe/throttle: Log throttle reasons

[Matthew Brost]

On Fri, Nov 15, 2024 at 06:26:14PM +0530, Raag Jadav wrote:
> Log throttle register MMIO reads which will be useful for debugging.
> 
> Signed-off-by: Raag Jadav <raag.jadav at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_gt_throttle.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xe/xe_gt_throttle.c b/drivers/gpu/drm/xe/xe_gt_throttle.c
> index 03b225364101..0ce21ffc08dc 100644
> --- a/drivers/gpu/drm/xe/xe_gt_throttle.c
> +++ b/drivers/gpu/drm/xe/xe_gt_throttle.c
> @@ -37,15 +37,18 @@ dev_to_gt(struct device *dev)
>  
>  u32 xe_gt_throttle_get_limit_reasons(struct xe_gt *gt)
>  {
> +	struct xe_device *xe = gt_to_xe(gt);
> +	bool media = xe_gt_is_media_type(gt);
>  	u32 reg;
>  
> -	xe_pm_runtime_get(gt_to_xe(gt));
> -	if (xe_gt_is_media_type(gt))
> +	xe_pm_runtime_get(xe);
> +	if (media)
>  		reg = xe_mmio_read32(&gt->mmio, MTL_MEDIA_PERF_LIMIT_REASONS);
>  	else
>  		reg = xe_mmio_read32(&gt->mmio, GT0_PERF_LIMIT_REASONS);
> -	xe_pm_runtime_put(gt_to_xe(gt));
> +	xe_pm_runtime_put(xe);
>  
> +	drm_dbg(&xe->drm, "%s reg: 0x%x\n", media ? "media" : "gt", reg);

How often does this happen? i.e. Is this common enough that it will spam
dmesg when running IGTs. I find messages which spam dmesg very annoying.
See this patch [1] I posted to remove one of these.

Matt

[1] https://patchwork.freedesktop.org/series/141426/

>  	return reg;
>  }
>  
> -- 
> 2.34.1
>