drm/i915: Add /proc debugging entry for reading out the HWS.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/i915/i915_gem_proc.c b/drivers/gpu/drm/i915/i915_gem_proc.c
index e8d5abe..4d1b9de 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_proc.c
+++ b/drivers/gpu/drm/i915/i915_gem_proc.c
@@ -250,6 +250,39 @@ static int i915_interrupt_info(char *buf, char **start, off_t offset,
        return len - offset;
 }
 
+static int i915_hws_info(char *buf, char **start, off_t offset,
+                        int request, int *eof, void *data)
+{
+       struct drm_minor *minor = (struct drm_minor *) data;
+       struct drm_device *dev = minor->dev;
+       drm_i915_private_t *dev_priv = dev->dev_private;
+       int len = 0, i;
+       volatile u32 *hws;
+
+       if (offset > DRM_PROC_LIMIT) {
+               *eof = 1;
+               return 0;
+       }
+
+       hws = (volatile u32 *)dev_priv->hw_status_page;
+       if (hws == NULL) {
+               *eof = 1;
+               return 0;
+       }
+
+       *start = &buf[offset];
+       *eof = 0;
+       for (i = 0; i < 4096 / sizeof(u32) / 4; i += 4) {
+               DRM_PROC_PRINT("0x%08x: 0x%08x 0x%08x 0x%08x 0x%08x\n",
+                              i * 4,
+                              hws[i], hws[i + 1], hws[i + 2], hws[i + 3]);
+       }
+       if (len > request + offset)
+               return request;
+       *eof = 1;
+       return len - offset;
+}
+
 static struct drm_proc_list {
        /** file name */
        const char *name;
@@ -262,6 +295,7 @@ static struct drm_proc_list {
        {"i915_gem_request", i915_gem_request_info},
        {"i915_gem_seqno", i915_gem_seqno_info},
        {"i915_gem_interrupt", i915_interrupt_info},
+       {"i915_gem_hws", i915_hws_info},
 };
 
 #define I915_GEM_PROC_ENTRIES ARRAY_SIZE(i915_gem_proc_list)