drm/i915: add debugfs file for swizzling information

This will also come handy for the gen6+ swizzling support, where the
driver is supposed to control swizzling depending upon dram
configuration.

v2: CxDRB3 are 16 bit regs! Noticed by Chris Wilson.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d410490..681cbe4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1379,6 +1379,55 @@ static int i915_gen6_forcewake_count_info(struct seq_file *m, void *data)
        return 0;
 }
 
+static const char *swizzle_string(unsigned swizzle)
+{
+       switch(swizzle) {
+       case I915_BIT_6_SWIZZLE_NONE:
+               return "none";
+       case I915_BIT_6_SWIZZLE_9:
+               return "bit9";
+       case I915_BIT_6_SWIZZLE_9_10:
+               return "bit9/bit10";
+       case I915_BIT_6_SWIZZLE_9_11:
+               return "bit9/bit11";
+       case I915_BIT_6_SWIZZLE_9_10_11:
+               return "bit9/bit10/bit11";
+       case I915_BIT_6_SWIZZLE_9_17:
+               return "bit9/bit17";
+       case I915_BIT_6_SWIZZLE_9_10_17:
+               return "bit9/bit10/bit17";
+       case I915_BIT_6_SWIZZLE_UNKNOWN:
+               return "unkown";
+       }
+
+       return "bug";
+}
+
+static int i915_swizzle_info(struct seq_file *m, void *data)
+{
+       struct drm_info_node *node = (struct drm_info_node *) m->private;
+       struct drm_device *dev = node->minor->dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+
+       mutex_lock(&dev->struct_mutex);
+       seq_printf(m, "bit6 swizzle for X-tiling = %s\n",
+                  swizzle_string(dev_priv->mm.bit_6_swizzle_x));
+       seq_printf(m, "bit6 swizzle for Y-tiling = %s\n",
+                  swizzle_string(dev_priv->mm.bit_6_swizzle_y));
+
+       if (IS_GEN3(dev) || IS_GEN4(dev)) {
+               seq_printf(m, "DDC = 0x%08x\n",
+                          I915_READ(DCC));
+               seq_printf(m, "C0DRB3 = 0x%04x\n",
+                          I915_READ16(C0DRB3));
+               seq_printf(m, "C1DRB3 = 0x%04x\n",
+                          I915_READ16(C1DRB3));
+       }
+       mutex_unlock(&dev->struct_mutex);
+
+       return 0;
+}
+
 static int
 i915_debugfs_common_open(struct inode *inode,
                         struct file *filp)
@@ -1719,6 +1768,7 @@ static struct drm_info_list i915_debugfs_list[] = {
        {"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
        {"i915_context_status", i915_context_status, 0},
        {"i915_gen6_forcewake_count", i915_gen6_forcewake_count_info, 0},
+       {"i915_swizzle_info", i915_swizzle_info, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)