Commit aa9b7810 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Late request cancellations are harmful 

Conceptually, each request is a record of a hardware transaction - we
build up a list of pending commands and then either commit them to
hardware, or cancel them. However, whilst building up the list of
pending commands, we may modify state outside of the request and make
references to the pending request. If we do so and then cancel that
request, external objects then point to the deleted request leading to
both graphical and memory corruption.

The easiest example is to consider object/VMA tracking. When we mark an
object as active in a request, we store a pointer to this, the most
recent request, in the object. Then we want to free that object, we wait
for the most recent request to be idle before proceeding (otherwise the
hardware will write to pages now owned by the system, or we will attempt
to read from those pages before the hardware is finished writing). If
the request was cancelled instead, that wait completes immediately. As a
result, all requests must be committed and not cancelled if the external
state is unknown.

All that remains of i915_gem_request_cancel() users are just a couple of
extremely unlikely allocation failures, so remove the API entirely.

A consequence of committing all incomplete requests is that we generate
excess breadcrumbs and fill the ring much more often with dummy work. We
have completely undone the outstanding_last_seqno optimisation.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93907


Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1460565315-7748-16-git-send-email-chris@chris-wilson.co.uk
parent fcb5106d

drivers/gpu/drm/i915/i915_drv.h

+0 −2
Original line number Diff line number Diff line
@@ -2331,7 +2331,6 @@ struct drm_i915_gem_request { 
struct drm_i915_gem_request * __must_check

i915_gem_request_alloc(struct intel_engine_cs *engine,

		       struct intel_context *ctx);

void i915_gem_request_cancel(struct drm_i915_gem_request *req);

void i915_gem_request_free(struct kref *req_ref);

int i915_gem_request_add_to_client(struct drm_i915_gem_request *req,

				   struct drm_file *file);
@@ -2888,7 +2887,6 @@ int i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data, 
			     struct drm_file *file_priv);

void i915_gem_execbuffer_move_to_active(struct list_head *vmas,

					struct drm_i915_gem_request *req);

void i915_gem_execbuffer_retire_commands(struct i915_execbuffer_params *params);

int i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,

				   struct drm_i915_gem_execbuffer2 *args,

				   struct list_head *vmas);

drivers/gpu/drm/i915/i915_gem.c

+20 −30
Original line number Diff line number Diff line
@@ -2791,7 +2791,8 @@ __i915_gem_request_alloc(struct intel_engine_cs *engine, 
		 * fully prepared. Thus it can be cleaned up using the proper

		 * free code.

		 */

		i915_gem_request_cancel(req);

		intel_ring_reserved_space_cancel(req->ringbuf);

		i915_gem_request_unreference(req);

		return ret;

	}
@@ -2828,13 +2829,6 @@ i915_gem_request_alloc(struct intel_engine_cs *engine, 
	return err ? ERR_PTR(err) : req;

}



void i915_gem_request_cancel(struct drm_i915_gem_request *req)

{

	intel_ring_reserved_space_cancel(req->ringbuf);



	i915_gem_request_unreference(req);

}



struct drm_i915_gem_request *

i915_gem_find_active_request(struct intel_engine_cs *engine)

{
@@ -3444,12 +3438,9 @@ int i915_gpu_idle(struct drm_device *dev) 
				return PTR_ERR(req);



			ret = i915_switch_context(req);

			if (ret) {

				i915_gem_request_cancel(req);

				return ret;

			}



			i915_add_request_no_flush(req);

			if (ret)

				return ret;

		}



		ret = intel_engine_idle(engine);
@@ -4949,34 +4940,33 @@ i915_gem_init_hw(struct drm_device *dev) 
		req = i915_gem_request_alloc(engine, NULL);

		if (IS_ERR(req)) {

			ret = PTR_ERR(req);

			i915_gem_cleanup_engines(dev);

			goto out;

			break;

		}



		if (engine->id == RCS) {

			for (j = 0; j < NUM_L3_SLICES(dev); j++)

				i915_gem_l3_remap(req, j);

			for (j = 0; j < NUM_L3_SLICES(dev); j++) {

				ret = i915_gem_l3_remap(req, j);

				if (ret)

					goto err_request;

			}

		}



		ret = i915_ppgtt_init_ring(req);

		if (ret && ret != -EIO) {

			DRM_ERROR("PPGTT enable %s failed %d\n",

				  engine->name, ret);

			i915_gem_request_cancel(req);

			i915_gem_cleanup_engines(dev);

			goto out;

		}

		if (ret)

			goto err_request;



		ret = i915_gem_context_enable(req);

		if (ret && ret != -EIO) {

			DRM_ERROR("Context enable %s failed %d\n",

		if (ret)

			goto err_request;



err_request:

		i915_add_request_no_flush(req);

		if (ret) {

			DRM_ERROR("Failed to enable %s, error=%d\n",

				  engine->name, ret);

			i915_gem_request_cancel(req);

			i915_gem_cleanup_engines(dev);

			goto out;

			break;

		}



		i915_add_request_no_flush(req);

	}



out:

drivers/gpu/drm/i915/i915_gem_execbuffer.c

+4 −11
Original line number Diff line number Diff line
@@ -1137,7 +1137,7 @@ i915_gem_execbuffer_move_to_active(struct list_head *vmas, 
	}

}



void

static void

i915_gem_execbuffer_retire_commands(struct i915_execbuffer_params *params)

{

	/* Unconditionally force add_request to emit a full flush. */
@@ -1322,7 +1322,6 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params, 
	trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);



	i915_gem_execbuffer_move_to_active(vmas, params->request);

	i915_gem_execbuffer_retire_commands(params);



	return 0;

}
@@ -1624,7 +1623,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, 


	ret = i915_gem_request_add_to_client(req, file);

	if (ret)

		goto err_batch_unpin;

		goto err_request;



	/*

	 * Save assorted stuff away to pass through to *_submission().
@@ -1641,6 +1640,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, 
	params->request                 = req;



	ret = dev_priv->gt.execbuf_submit(params, args, &eb->vmas);

err_request:

	i915_gem_execbuffer_retire_commands(params);



err_batch_unpin:

	/*
@@ -1657,14 +1658,6 @@ err: 
	i915_gem_context_unreference(ctx);

	eb_destroy(eb);



	/*

	 * If the request was created but not successfully submitted then it

	 * must be freed again. If it was submitted then it is being tracked

	 * on the active request list and no clean up is required here.

	 */

	if (ret && !IS_ERR_OR_NULL(req))

		i915_gem_request_cancel(req);



	mutex_unlock(&dev->struct_mutex);



pre_mutex_err:

drivers/gpu/drm/i915/intel_display.c

+1 −1
Original line number Diff line number Diff line
@@ -11664,7 +11664,7 @@ cleanup_unpin: 
	intel_unpin_fb_obj(fb, crtc->primary->state->rotation);

cleanup_pending:

	if (!IS_ERR_OR_NULL(request))

		i915_gem_request_cancel(request);

		i915_add_request_no_flush(request);

	atomic_dec(&intel_crtc->unpin_work_count);

	mutex_unlock(&dev->struct_mutex);

cleanup:

drivers/gpu/drm/i915/intel_lrc.c

+1 −3
Original line number Diff line number Diff line
@@ -1007,7 +1007,6 @@ int intel_execlists_submission(struct i915_execbuffer_params *params, 
	trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);



	i915_gem_execbuffer_move_to_active(vmas, params->request);

	i915_gem_execbuffer_retire_commands(params);



	return 0;

}
@@ -2700,13 +2699,12 @@ int intel_lr_context_deferred_alloc(struct intel_context *ctx, 
		}



		ret = engine->init_context(req);

		i915_add_request_no_flush(req);

		if (ret) {

			DRM_ERROR("ring init context: %d\n",

				ret);

			i915_gem_request_cancel(req);

			goto error_ringbuf;

		}

		i915_add_request_no_flush(req);

	}

	return 0;

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