drm/i915: fix context/engine cleanup order

Swap the order of context & engine cleanup, so that contexts are cleaned
up first, and *then* engines. This is a more sensible order anyway, but
in particular has become necessary since the 'intel_ring_initialized()
must be simple and inline' patch, which now uses ring->dev as an
'initialised' flag, so it can now be NULL after engine teardown. This
in turn can cause a problem in the context code, which (used to) check
the ring->dev->struct_mutex -- causing a fault if ring->dev was NULL.

Also rename the cleanup function to reflect what it actually does
(cleanup engines, not a ringbuffer), and fix an annoying whitespace issue.

v2: Also make the fix in i915_load_modeset_init, not just in
    i915_driver_unload (Chris Wilson)
v3: Had extra stuff in it.
v4: Reverted extra stuff (so we're back to v2).
    Rebased and updated commentary above (Dave Gordon).

Signed-off-by: Nick Hoath <nicholas.hoath@intel.com>
Signed-off-by: David Gordon <david.s.gordon@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1453504211-7982-2-git-send-email-david.s.gordon@intel.com

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 35c2b33..571d7e6 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -444,8 +444,8 @@ static int i915_load_modeset_init(struct drm_device *dev)
 
 cleanup_gem:
        mutex_lock(&dev->struct_mutex);
-       i915_gem_cleanup_ringbuffer(dev);
        i915_gem_context_fini(dev);
+       i915_gem_cleanup_engines(dev);
        mutex_unlock(&dev->struct_mutex);
 cleanup_irq:
        intel_guc_ucode_fini(dev);
@@ -1256,8 +1256,8 @@ int i915_driver_unload(struct drm_device *dev)
 
        intel_guc_ucode_fini(dev);
        mutex_lock(&dev->struct_mutex);
-       i915_gem_cleanup_ringbuffer(dev);
        i915_gem_context_fini(dev);
+       i915_gem_cleanup_engines(dev);
        mutex_unlock(&dev->struct_mutex);
        intel_fbc_cleanup_cfb(dev_priv);
 

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8216665..e11eef1 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3058,7 +3058,7 @@ int i915_gem_init_rings(struct drm_device *dev);
 int __must_check i915_gem_init_hw(struct drm_device *dev);
 int i915_gem_l3_remap(struct drm_i915_gem_request *req, int slice);
 void i915_gem_init_swizzling(struct drm_device *dev);
-void i915_gem_cleanup_ringbuffer(struct drm_device *dev);
+void i915_gem_cleanup_engines(struct drm_device *dev);
 int __must_check i915_gpu_idle(struct drm_device *dev);
 int __must_check i915_gem_suspend(struct drm_device *dev);
 void __i915_add_request(struct drm_i915_gem_request *req,

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e9b19bc..de57e7f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4913,7 +4913,7 @@ i915_gem_init_hw(struct drm_device *dev)
                req = i915_gem_request_alloc(ring, NULL);
                if (IS_ERR(req)) {
                        ret = PTR_ERR(req);
-                       i915_gem_cleanup_ringbuffer(dev);
+                       i915_gem_cleanup_engines(dev);
                        goto out;
                }
 
@@ -4926,7 +4926,7 @@ i915_gem_init_hw(struct drm_device *dev)
                if (ret && ret != -EIO) {
                        DRM_ERROR("PPGTT enable ring #%d failed %d\n", i, ret);
                        i915_gem_request_cancel(req);
-                       i915_gem_cleanup_ringbuffer(dev);
+                       i915_gem_cleanup_engines(dev);
                        goto out;
                }
 
@@ -4934,7 +4934,7 @@ i915_gem_init_hw(struct drm_device *dev)
                if (ret && ret != -EIO) {
                        DRM_ERROR("Context enable ring #%d failed %d\n", i, ret);
                        i915_gem_request_cancel(req);
-                       i915_gem_cleanup_ringbuffer(dev);
+                       i915_gem_cleanup_engines(dev);
                        goto out;
                }
 
@@ -5009,7 +5009,7 @@ out_unlock:
 }
 
 void
-i915_gem_cleanup_ringbuffer(struct drm_device *dev)
+i915_gem_cleanup_engines(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_engine_cs *ring;
@@ -5018,13 +5018,14 @@ i915_gem_cleanup_ringbuffer(struct drm_device *dev)
        for_each_ring(ring, dev_priv, i)
                dev_priv->gt.cleanup_ring(ring);
 
-    if (i915.enable_execlists)
-            /*
-             * Neither the BIOS, ourselves or any other kernel
-             * expects the system to be in execlists mode on startup,
-             * so we need to reset the GPU back to legacy mode.
-             */
-            intel_gpu_reset(dev);
+       if (i915.enable_execlists) {
+               /*
+                * Neither the BIOS, ourselves or any other kernel
+                * expects the system to be in execlists mode on startup,
+                * so we need to reset the GPU back to legacy mode.
+                */
+               intel_gpu_reset(dev);
+       }
 }
 
 static void