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>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_proc.c b/drivers/gpu/drm/i915/i915_gem_proc.c
index e8d5abe1250e..4d1b9de0cd8b 100644
--- 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)