drm/i915: context debug messages

Add some debug messages to help figure out what goes wrong on context
initialization.

Later in the PPGTT series, I ended up having a lot of failures after
reset. In many cases it was extra difficult to debug because I hadn't
even realized that contexts failed to reinitialize after reset (again an
artifact of some later patches).

This fairly benign patch does help debug some potential issues which
arise later.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 64cb190..39bcc08 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -156,7 +156,8 @@ create_hw_context(struct drm_device *dev,
        if (INTEL_INFO(dev)->gen >= 7) {
                ret = i915_gem_object_set_cache_level(ctx->obj,
                                                      I915_CACHE_LLC_MLC);
-               if (ret)
+               /* Failure shouldn't ever happen this early */
+               if (WARN_ON(ret))
                        goto err_out;
        }
 
@@ -214,12 +215,16 @@ static int create_default_context(struct drm_i915_private *dev_priv)
         */
        dev_priv->ring[RCS].default_context = ctx;
        ret = i915_gem_object_pin(ctx->obj, CONTEXT_ALIGN, false, false);
-       if (ret)
+       if (ret) {
+               DRM_DEBUG_DRIVER("Couldn't pin %d\n", ret);
                goto err_destroy;
+       }
 
        ret = do_switch(ctx);
-       if (ret)
+       if (ret) {
+               DRM_DEBUG_DRIVER("Switch failed %d\n", ret);
                goto err_unpin;
+       }
 
        DRM_DEBUG_DRIVER("Default HW context loaded\n");
        return 0;
@@ -237,6 +242,7 @@ void i915_gem_context_init(struct drm_device *dev)
 
        if (!HAS_HW_CONTEXTS(dev)) {
                dev_priv->hw_contexts_disabled = true;
+               DRM_DEBUG_DRIVER("Disabling HW Contexts; old hardware\n");
                return;
        }
 
@@ -249,11 +255,13 @@ void i915_gem_context_init(struct drm_device *dev)
 
        if (dev_priv->hw_context_size > (1<<20)) {
                dev_priv->hw_contexts_disabled = true;
+               DRM_DEBUG_DRIVER("Disabling HW Contexts; invalid size\n");
                return;
        }
 
        if (create_default_context(dev_priv)) {
                dev_priv->hw_contexts_disabled = true;
+               DRM_DEBUG_DRIVER("Disabling HW Contexts; create failed\n");
                return;
        }