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drm/i915: catch gtfifo errors on forcewake_put

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This is similar to a patch I wrote several months ago. It's been updated
for the new FORCEWAKE_MT. As recommended by Chris Wilson, use WARN()
instead of DRM_ERROR, so we can get a backtrace.

This shouldn't impact performance too much as the extra register read
can replace the POSTING_READ we had previously.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2012-02-09 10:15:19 +01:00 committed by Daniel Vetter
parent dd202c6dd6
commit ee64cbdbf6
1 changed files with 13 additions and 2 deletions
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15
drivers/gpu/drm/i915/i915_drv.c
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@ -385,16 +385,27 @@ void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags);
}
static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
{
u32 gtfifodbg;
gtfifodbg = I915_READ_NOTRACE(GTFIFODBG);
if (WARN(gtfifodbg & GT_FIFO_CPU_ERROR_MASK,
"MMIO read or write has been dropped %x\n", gtfifodbg))
I915_WRITE_NOTRACE(GTFIFODBG, GT_FIFO_CPU_ERROR_MASK);
}
void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
{
I915_WRITE_NOTRACE(FORCEWAKE, 0);
POSTING_READ(FORCEWAKE);
/* The below doubles as a POSTING_READ */
gen6_gt_check_fifodbg(dev_priv);
}
void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)
{
I915_WRITE_NOTRACE(FORCEWAKE_MT, (1<<16) | 0);
POSTING_READ(FORCEWAKE_MT);
/* The below doubles as a POSTING_READ */
gen6_gt_check_fifodbg(dev_priv);
}
/*