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>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f6940f1..2692410 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -264,6 +264,9 @@ typedef struct drm_i915_private {
        int front_offset;
        int current_page;
        int page_flipping;
+#define I915_DEBUG_READ (1<<0)
+#define I915_DEBUG_WRITE (1<<1)
+       unsigned long debug_flags;
 
        wait_queue_head_t irq_queue;
        atomic_t irq_received;
@@ -1100,8 +1103,26 @@ extern void intel_overlay_print_error_state(struct seq_file *m, struct intel_ove
                LOCK_TEST_WITH_RETURN(dev, file_priv);                  \
 } while (0)
 
-#define I915_READ(reg)          readl(dev_priv->regs + (reg))
-#define I915_WRITE(reg, val)     writel(val, dev_priv->regs + (reg))
+static inline u32 i915_read(struct drm_i915_private *dev_priv, u32 reg)
+{
+       u32 val;
+
+       val = readl(dev_priv->regs + reg);
+       if (dev_priv->debug_flags & I915_DEBUG_READ)
+               printk(KERN_ERR "read 0x%08x from 0x%08x\n", val, reg);
+       return val;
+}
+
+static inline void i915_write(struct drm_i915_private *dev_priv, u32 reg,
+                             u32 val)
+{
+       writel(val, dev_priv->regs + reg);
+       if (dev_priv->debug_flags & I915_DEBUG_WRITE)
+               printk(KERN_ERR "wrote 0x%08x to 0x%08x\n", val, reg);
+}
+
+#define I915_READ(reg)          i915_read(dev_priv, (reg))
+#define I915_WRITE(reg, val)    i915_write(dev_priv, (reg), (val))
 #define I915_READ16(reg)       readw(dev_priv->regs + (reg))
 #define I915_WRITE16(reg, val) writel(val, dev_priv->regs + (reg))
 #define I915_READ8(reg)                readb(dev_priv->regs + (reg))
@@ -1111,6 +1132,11 @@ extern void intel_overlay_print_error_state(struct seq_file *m, struct intel_ove
 #define POSTING_READ(reg)      (void)I915_READ(reg)
 #define POSTING_READ16(reg)    (void)I915_READ16(reg)
 
+#define I915_DEBUG_ENABLE_IO() (dev_priv->debug_flags |= I915_DEBUG_READ | \
+                               I915_DEBUG_WRITE)
+#define I915_DEBUG_DISABLE_IO() (dev_priv->debug_flags &= ~(I915_DEBUG_READ | \
+                                                           I915_DEBUG_WRITE))
+
 #define I915_VERBOSE 0
 
 #define BEGIN_LP_RING(n)  do { \