Re: [PATCH 02/38] drm/i915: Make all GPU resets atomic

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> In preparation for the next few commits, make resetting the GPU atomic.
> Currently, we have prepared gen6+ for atomic resetting of individual
> engines, but now there is a requirement to perform the whole device
> level reset (just the register poking) from inside an atomic context.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_reset.c | 50 +++++++++++++++++--------------
>  1 file changed, 27 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
> index 342d9ee42601..b9d0ea70361c 100644
> --- a/drivers/gpu/drm/i915/i915_reset.c
> +++ b/drivers/gpu/drm/i915/i915_reset.c
> @@ -144,14 +144,14 @@ static int i915_do_reset(struct drm_i915_private *i915,
>  
>  	/* Assert reset for at least 20 usec, and wait for acknowledgement. */
>  	pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
> -	usleep_range(50, 200);
> -	err = wait_for(i915_in_reset(pdev), 500);
> +	udelay(50);
> +	err = wait_for_atomic(i915_in_reset(pdev), 50);
>  
>  	/* Clear the reset request. */
>  	pci_write_config_byte(pdev, I915_GDRST, 0);
> -	usleep_range(50, 200);
> +	udelay(50);
>  	if (!err)
> -		err = wait_for(!i915_in_reset(pdev), 500);
> +		err = wait_for_atomic(!i915_in_reset(pdev), 50);
>  
>  	return err;
>  }
> @@ -171,7 +171,7 @@ static int g33_do_reset(struct drm_i915_private *i915,
>  	struct pci_dev *pdev = i915->drm.pdev;
>  
>  	pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
> -	return wait_for(g4x_reset_complete(pdev), 500);
> +	return wait_for_atomic(g4x_reset_complete(pdev), 50);
>  }
>  
>  static int g4x_do_reset(struct drm_i915_private *dev_priv,
> @@ -182,13 +182,13 @@ static int g4x_do_reset(struct drm_i915_private *dev_priv,
>  	int ret;
>  
>  	/* WaVcpClkGateDisableForMediaReset:ctg,elk */
> -	I915_WRITE(VDECCLK_GATE_D,
> -		   I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
> -	POSTING_READ(VDECCLK_GATE_D);
> +	I915_WRITE_FW(VDECCLK_GATE_D,
> +		      I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
> +	POSTING_READ_FW(VDECCLK_GATE_D);
>  
>  	pci_write_config_byte(pdev, I915_GDRST,
>  			      GRDOM_MEDIA | GRDOM_RESET_ENABLE);
> -	ret =  wait_for(g4x_reset_complete(pdev), 500);
> +	ret =  wait_for_atomic(g4x_reset_complete(pdev), 50);
>  	if (ret) {
>  		DRM_DEBUG_DRIVER("Wait for media reset failed\n");
>  		goto out;
> @@ -196,7 +196,7 @@ static int g4x_do_reset(struct drm_i915_private *dev_priv,
>  
>  	pci_write_config_byte(pdev, I915_GDRST,
>  			      GRDOM_RENDER | GRDOM_RESET_ENABLE);
> -	ret =  wait_for(g4x_reset_complete(pdev), 500);
> +	ret =  wait_for_atomic(g4x_reset_complete(pdev), 50);
>  	if (ret) {
>  		DRM_DEBUG_DRIVER("Wait for render reset failed\n");
>  		goto out;
> @@ -205,9 +205,9 @@ static int g4x_do_reset(struct drm_i915_private *dev_priv,
>  out:
>  	pci_write_config_byte(pdev, I915_GDRST, 0);
>  
> -	I915_WRITE(VDECCLK_GATE_D,
> -		   I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
> -	POSTING_READ(VDECCLK_GATE_D);
> +	I915_WRITE_FW(VDECCLK_GATE_D,
> +		      I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
> +	POSTING_READ_FW(VDECCLK_GATE_D);
>  
>  	return ret;
>  }
> @@ -218,27 +218,29 @@ static int ironlake_do_reset(struct drm_i915_private *dev_priv,
>  {
>  	int ret;
>  
> -	I915_WRITE(ILK_GDSR, ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
> -	ret = intel_wait_for_register(dev_priv,
> -				      ILK_GDSR, ILK_GRDOM_RESET_ENABLE, 0,
> -				      500);
> +	I915_WRITE_FW(ILK_GDSR, ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
> +	ret = __intel_wait_for_register_fw(dev_priv, ILK_GDSR,
> +					   ILK_GRDOM_RESET_ENABLE, 0,
> +					   5000, 0,
> +					   NULL);
>  	if (ret) {
>  		DRM_DEBUG_DRIVER("Wait for render reset failed\n");
>  		goto out;
>  	}
>  
> -	I915_WRITE(ILK_GDSR, ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
> -	ret = intel_wait_for_register(dev_priv,
> -				      ILK_GDSR, ILK_GRDOM_RESET_ENABLE, 0,
> -				      500);
> +	I915_WRITE_FW(ILK_GDSR, ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
> +	ret = __intel_wait_for_register_fw(dev_priv, ILK_GDSR,
> +					   ILK_GRDOM_RESET_ENABLE, 0,
> +					   5000, 0,
> +					   NULL);
>  	if (ret) {
>  		DRM_DEBUG_DRIVER("Wait for media reset failed\n");
>  		goto out;
>  	}
>  
>  out:
> -	I915_WRITE(ILK_GDSR, 0);
> -	POSTING_READ(ILK_GDSR);
> +	I915_WRITE_FW(ILK_GDSR, 0);
> +	POSTING_READ_FW(ILK_GDSR);
>  	return ret;
>  }
>  
> @@ -572,7 +574,9 @@ int intel_gpu_reset(struct drm_i915_private *i915, unsigned int engine_mask)
>  		ret = -ENODEV;
>  		if (reset) {
>  			GEM_TRACE("engine_mask=%x\n", engine_mask);
> +			preempt_disable();
>  			ret = reset(i915, engine_mask, retry);
> +			preempt_enable();
>  		}
>  		if (ret != -ETIMEDOUT || engine_mask != ALL_ENGINES)
>  			break;
> -- 
> 2.20.1
>
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