[PATCH v3 8/8] drm/i915/reset: add modeset_stuck callback to intel_display_reset_prepare()

[Matt Roper]

On Mon, Mar 03, 2025 at 01:27:10PM +0200, Jani Nikula wrote:
> Drop the dependency on gt by providing a callback for trying to unbreak
> stuck modeset. Do intel_gt_set_wedged() via the callback.
> 
> It's by no means pretty, but this is perhaps the most straightforward
> alternative.
> 
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_display_reset.c | 6 +++---
>  drivers/gpu/drm/i915/display/intel_display_reset.h | 5 ++++-
>  drivers/gpu/drm/i915/gt/intel_reset.c              | 9 ++++++++-
>  3 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_reset.c b/drivers/gpu/drm/i915/display/intel_display_reset.c
> index d5ce0ac43377..1f2798404f2c 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_reset.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_reset.c
> @@ -20,9 +20,9 @@ bool intel_display_reset_test(struct intel_display *display)
>  }
>  
>  /* returns true if intel_display_reset_finish() needs to be called */
> -bool intel_display_reset_prepare(struct intel_display *display)
> +bool intel_display_reset_prepare(struct intel_display *display,
> +				 modeset_stuck_fn modeset_stuck, void *context)
>  {
> -	struct drm_i915_private *dev_priv = to_i915(display->drm);
>  	struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;
>  	struct drm_atomic_state *state;
>  	int ret;
> @@ -33,7 +33,7 @@ bool intel_display_reset_prepare(struct intel_display *display)
>  	if (atomic_read(&display->restore.pending_fb_pin)) {
>  		drm_dbg_kms(display->drm,
>  			    "Modeset potentially stuck, unbreaking through wedging\n");
> -		intel_gt_set_wedged(to_gt(dev_priv));
> +		modeset_stuck(context);
>  	}
>  
>  	/*
> diff --git a/drivers/gpu/drm/i915/display/intel_display_reset.h b/drivers/gpu/drm/i915/display/intel_display_reset.h
> index f518147199a1..8b3bda134454 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_reset.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_reset.h
> @@ -10,8 +10,11 @@
>  
>  struct intel_display;
>  
> +typedef void modeset_stuck_fn(void *context);
> +
>  bool intel_display_reset_test(struct intel_display *display);
> -bool intel_display_reset_prepare(struct intel_display *display);
> +bool intel_display_reset_prepare(struct intel_display *display,
> +				 modeset_stuck_fn modeset_stuck, void *context);
>  void intel_display_reset_finish(struct intel_display *display, bool test_only);
>  
>  #endif /* __INTEL_RESET_H__ */
> diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
> index 0f12752d0f24..dbdcfe130ad4 100644
> --- a/drivers/gpu/drm/i915/gt/intel_reset.c
> +++ b/drivers/gpu/drm/i915/gt/intel_reset.c
> @@ -1400,6 +1400,11 @@ int intel_engine_reset(struct intel_engine_cs *engine, const char *msg)
>  	return err;
>  }
>  
> +static void display_reset_modeset_stuck(void *gt)
> +{
> +	intel_gt_set_wedged(gt);
> +}
> +
>  static void intel_gt_reset_global(struct intel_gt *gt,
>  				  u32 engine_mask,
>  				  const char *reason)
> @@ -1429,7 +1434,9 @@ static void intel_gt_reset_global(struct intel_gt *gt,
>  			need_display_reset;
>  
>  		if (reset_display)
> -			reset_display = intel_display_reset_prepare(display);
> +			reset_display = intel_display_reset_prepare(display,
> +								    display_reset_modeset_stuck,
> +								    gt);
>  
>  		intel_gt_reset(gt, engine_mask, reason);
>  
> -- 
> 2.39.5
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation