Re: [PATCH 2/2] drm/i915: print Gen5+ CPU/PCH poison interrupts

[Imre Deak <imre.deak@intel.com>]

On Fri, 2013-04-12 at 17:57 -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni@intel.com>
> 
> This is bad news and shouldn't be happening.
> 
> V2: Rebase.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

Looks ok:
Reviewed-by: Imre Deak <imre.deak@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_irq.c |   13 +++++++++++--
>  drivers/gpu/drm/i915/i915_reg.h |    2 ++
>  2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 9aff6ed..8b2461b 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -939,6 +939,9 @@ static void ivb_err_int_handler(struct drm_device *dev)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	u32 err_int = I915_READ(GEN7_ERR_INT);
>  
> +	if (err_int & ERR_INT_POISON)
> +		DRM_ERROR("Poison interrupt\n");
> +
>  	if (err_int & ERR_INT_FIFO_UNDERRUN_A)
>  		if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_A, false))
>  			DRM_DEBUG_DRIVER("Pipe A FIFO underrun\n");
> @@ -959,6 +962,9 @@ static void cpt_serr_int_handler(struct drm_device *dev)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	u32 serr_int = I915_READ(SERR_INT);
>  
> +	if (serr_int & SERR_INT_POISON)
> +		DRM_ERROR("PCH poison interrupt\n");
> +
>  	if (serr_int & SERR_INT_TRANS_A_FIFO_UNDERRUN)
>  		if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
>  							  false))
> @@ -1172,6 +1178,9 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
>  	if (de_iir & DE_PIPEB_VBLANK)
>  		drm_handle_vblank(dev, 1);
>  
> +	if (de_iir & DE_POISON)
> +		DRM_ERROR("Poison interrupt\n");
> +
>  	if (de_iir & DE_PIPEA_FIFO_UNDERRUN)
>  		if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_A, false))
>  			DRM_DEBUG_DRIVER("Pipe A FIFO underrun\n");
> @@ -2403,7 +2412,7 @@ static void ibx_irq_postinstall(struct drm_device *dev)
>  
>  	if (HAS_PCH_IBX(dev)) {
>  		mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
> -		       SDE_TRANSA_FIFO_UNDER;
> +		       SDE_TRANSA_FIFO_UNDER | SDE_POISON;
>  	} else {
>  		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
>  
> @@ -2424,7 +2433,7 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
>  	u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
>  			   DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
>  			   DE_AUX_CHANNEL_A | DE_PIPEB_FIFO_UNDERRUN |
> -			   DE_PIPEA_FIFO_UNDERRUN;
> +			   DE_PIPEA_FIFO_UNDERRUN | DE_POISON;
>  	u32 render_irqs;
>  
>  	dev_priv->irq_mask = ~display_mask;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 932b4a0..68a27e1 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -529,6 +529,7 @@
>  
>  #define ERROR_GEN6	0x040a0
>  #define GEN7_ERR_INT	0x44040
> +#define   ERR_INT_POISON		(1<<31)
>  #define   ERR_INT_MMIO_UNCLAIMED	(1<<13)
>  #define   ERR_INT_FIFO_UNDERRUN_C	(1<<6)
>  #define   ERR_INT_FIFO_UNDERRUN_B	(1<<3)
> @@ -3693,6 +3694,7 @@
>  #define SDEIER  0xc400c
>  
>  #define SERR_INT			0xc4040
> +#define  SERR_INT_POISON		(1<<31)
>  #define  SERR_INT_TRANS_C_FIFO_UNDERRUN	(1<<6)
>  #define  SERR_INT_TRANS_B_FIFO_UNDERRUN	(1<<3)
>  #define  SERR_INT_TRANS_A_FIFO_UNDERRUN	(1<<0)