drm/i915: check gtfifodbg after possibly failed writes
If we don't have a sufficient number of free entries in the FIFO, we proceed to do a write anyway. With this check we should have a clue if that write actually failed or not. After some discussion with Daniel Vetter regarding his original complaint, we agreed upon this. 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>
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@ -421,8 +421,10 @@ void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
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spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags);
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}
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void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
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int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
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{
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int ret = 0;
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if (dev_priv->gt_fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
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int loop = 500;
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u32 fifo = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
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@ -430,10 +432,13 @@ void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
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udelay(10);
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fifo = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
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}
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WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES);
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if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
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++ret;
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dev_priv->gt_fifo_count = fifo;
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}
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dev_priv->gt_fifo_count--;
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return ret;
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}
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static int i915_drm_freeze(struct drm_device *dev)
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@ -1001,11 +1006,15 @@ __i915_read(64, q)
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#define __i915_write(x, y) \
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void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
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u32 __fifo_ret = 0; \
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trace_i915_reg_rw(true, reg, val, sizeof(val)); \
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if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
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__gen6_gt_wait_for_fifo(dev_priv); \
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__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
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} \
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write##y(val, dev_priv->regs + reg); \
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if (unlikely(__fifo_ret)) { \
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gen6_gt_check_fifodbg(dev_priv); \
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} \
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}
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__i915_write(8, b)
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__i915_write(16, w)
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@ -1401,7 +1401,7 @@ extern void intel_display_print_error_state(struct seq_file *m,
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*/
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void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv);
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void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv);
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void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);
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int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);
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/* We give fast paths for the really cool registers */
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#define NEEDS_FORCE_WAKE(dev_priv, reg) \
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