drm/i915: add MMIO debug output
Useful for capturing register read/write traces to send to the hw guys. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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@ -264,6 +264,9 @@ typedef struct drm_i915_private {
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int front_offset;
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int current_page;
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int page_flipping;
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#define I915_DEBUG_READ (1<<0)
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#define I915_DEBUG_WRITE (1<<1)
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unsigned long debug_flags;
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wait_queue_head_t irq_queue;
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atomic_t irq_received;
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@ -1100,8 +1103,26 @@ extern void intel_overlay_print_error_state(struct seq_file *m, struct intel_ove
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LOCK_TEST_WITH_RETURN(dev, file_priv); \
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} while (0)
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#define I915_READ(reg) readl(dev_priv->regs + (reg))
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#define I915_WRITE(reg, val) writel(val, dev_priv->regs + (reg))
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static inline u32 i915_read(struct drm_i915_private *dev_priv, u32 reg)
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{
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u32 val;
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val = readl(dev_priv->regs + reg);
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if (dev_priv->debug_flags & I915_DEBUG_READ)
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printk(KERN_ERR "read 0x%08x from 0x%08x\n", val, reg);
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return val;
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}
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static inline void i915_write(struct drm_i915_private *dev_priv, u32 reg,
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u32 val)
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{
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writel(val, dev_priv->regs + reg);
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if (dev_priv->debug_flags & I915_DEBUG_WRITE)
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printk(KERN_ERR "wrote 0x%08x to 0x%08x\n", val, reg);
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}
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#define I915_READ(reg) i915_read(dev_priv, (reg))
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#define I915_WRITE(reg, val) i915_write(dev_priv, (reg), (val))
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#define I915_READ16(reg) readw(dev_priv->regs + (reg))
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#define I915_WRITE16(reg, val) writel(val, dev_priv->regs + (reg))
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#define I915_READ8(reg) readb(dev_priv->regs + (reg))
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@ -1111,6 +1132,11 @@ extern void intel_overlay_print_error_state(struct seq_file *m, struct intel_ove
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#define POSTING_READ(reg) (void)I915_READ(reg)
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#define POSTING_READ16(reg) (void)I915_READ16(reg)
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#define I915_DEBUG_ENABLE_IO() (dev_priv->debug_flags |= I915_DEBUG_READ | \
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I915_DEBUG_WRITE)
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#define I915_DEBUG_DISABLE_IO() (dev_priv->debug_flags &= ~(I915_DEBUG_READ | \
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I915_DEBUG_WRITE))
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#define I915_VERBOSE 0
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#define BEGIN_LP_RING(n) do { \
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