drm/i915: Tidy up some error messages around reset failure

On blb and pnv, we are seeing sporadic

  i915 0000:00:02.0: Resetting chip after gpu hang
  [drm:intel_gpu_reset [i915]] rcs0: timed out on STOP_RING
  [drm:i915_reset [i915]] *ERROR* Failed hw init on reset -5

which notably lack the actual root cause of the error. Ostensibly it
should be the init_ring_common() that failed, but it's error paths are
covered by DRM_ERROR.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207111545.17078-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e9f1daf..bb605e0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1957,7 +1957,8 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
         */
        ret = i915_ggtt_enable_hw(i915);
        if (ret) {
-               DRM_ERROR("Failed to re-enable GGTT following reset %d\n", ret);
+               DRM_ERROR("Failed to re-enable GGTT following reset (%d)\n",
+                         ret);
                goto error;
        }
 
@@ -1974,7 +1975,8 @@ void i915_reset(struct drm_i915_private *i915, unsigned int flags)
         */
        ret = i915_gem_init_hw(i915);
        if (ret) {
-               DRM_ERROR("Failed hw init on reset %d\n", ret);
+               DRM_ERROR("Failed to initialise HW following reset (%d)\n",
+                         ret);
                goto error;
        }
 

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1632f18..c1b80cd 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5065,8 +5065,11 @@ static int __i915_gem_restart_engines(void *data)
 
        for_each_engine(engine, i915, id) {
                err = engine->init_hw(engine);
-               if (err)
+               if (err) {
+                       DRM_ERROR("Failed to restart %s (%d)\n",
+                                 engine->name, err);
                        return err;
+               }
        }
 
        return 0;
@@ -5118,14 +5121,16 @@ int i915_gem_init_hw(struct drm_i915_private *dev_priv)
 
        ret = i915_ppgtt_init_hw(dev_priv);
        if (ret) {
-               DRM_ERROR("PPGTT enable HW failed %d\n", ret);
+               DRM_ERROR("Enabling PPGTT failed (%d)\n", ret);
                goto out;
        }
 
        /* We can't enable contexts until all firmware is loaded */
        ret = intel_uc_init_hw(dev_priv);
-       if (ret)
+       if (ret) {
+               DRM_ERROR("Enabling uc failed (%d)\n", ret);
                goto out;
+       }
 
        intel_mocs_init_l3cc_table(dev_priv);
 

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e208582..f93e453 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -453,13 +453,13 @@ static int init_ring_common(struct intel_engine_cs *engine)
 
        if (!stop_ring(engine)) {
                /* G45 ring initialization often fails to reset head to zero */
-               DRM_DEBUG_KMS("%s head not reset to zero "
-                             "ctl %08x head %08x tail %08x start %08x\n",
-                             engine->name,
-                             I915_READ_CTL(engine),
-                             I915_READ_HEAD(engine),
-                             I915_READ_TAIL(engine),
-                             I915_READ_START(engine));
+               DRM_DEBUG_DRIVER("%s head not reset to zero "
+                               "ctl %08x head %08x tail %08x start %08x\n",
+                               engine->name,
+                               I915_READ_CTL(engine),
+                               I915_READ_HEAD(engine),
+                               I915_READ_TAIL(engine),
+                               I915_READ_START(engine));
 
                if (!stop_ring(engine)) {
                        DRM_ERROR("failed to set %s head to zero "
@@ -492,8 +492,8 @@ static int init_ring_common(struct intel_engine_cs *engine)
 
        /* WaClearRingBufHeadRegAtInit:ctg,elk */
        if (I915_READ_HEAD(engine))
-               DRM_DEBUG("%s initialization failed [head=%08x], fudging\n",
-                         engine->name, I915_READ_HEAD(engine));
+               DRM_DEBUG_DRIVER("%s initialization failed [head=%08x], fudging\n",
+                                engine->name, I915_READ_HEAD(engine));
 
        intel_ring_update_space(ring);
        I915_WRITE_HEAD(engine, ring->head);