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Commit bc0dce3f authored by John Harrison's avatar John Harrison Committed by Daniel Vetter
Browse files

drm/i915: Make intel_logical_ring_begin() static 



The only usage of intel_logical_ring_begin() is within intel_lrc.c so it can be
made static. To avoid a forward declaration at the top of the file, it and bunch
of other functions have been shuffled upwards.

For: VIZ-5115
Signed-off-by: default avatarJohn Harrison <John.C.Harrison@Intel.com>
Reviewed-by: default avatarTomas Elf <tomas.elf@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent f3dc74c0

drivers/gpu/drm/i915/intel_lrc.c

+237 −237
Original line number Diff line number Diff line
@@ -611,6 +611,243 @@ static int execlists_move_to_gpu(struct intel_ringbuffer *ringbuf, 
	return logical_ring_invalidate_all_caches(ringbuf, ctx);

}



static int logical_ring_alloc_request(struct intel_engine_cs *ring,

				      struct intel_context *ctx)

{

	struct drm_i915_gem_request *request;

	struct drm_i915_private *dev_private = ring->dev->dev_private;

	int ret;



	if (ring->outstanding_lazy_request)

		return 0;



	request = kzalloc(sizeof(*request), GFP_KERNEL);

	if (request == NULL)

		return -ENOMEM;



	if (ctx != ring->default_context) {

		ret = intel_lr_context_pin(ring, ctx);

		if (ret) {

			kfree(request);

			return ret;

		}

	}



	kref_init(&request->ref);

	request->ring = ring;

	request->uniq = dev_private->request_uniq++;



	ret = i915_gem_get_seqno(ring->dev, &request->seqno);

	if (ret) {

		intel_lr_context_unpin(ring, ctx);

		kfree(request);

		return ret;

	}



	request->ctx = ctx;

	i915_gem_context_reference(request->ctx);

	request->ringbuf = ctx->engine[ring->id].ringbuf;



	ring->outstanding_lazy_request = request;

	return 0;

}



static int logical_ring_wait_request(struct intel_ringbuffer *ringbuf,

				     int bytes)

{

	struct intel_engine_cs *ring = ringbuf->ring;

	struct drm_i915_gem_request *request;

	int ret;



	if (intel_ring_space(ringbuf) >= bytes)

		return 0;



	list_for_each_entry(request, &ring->request_list, list) {

		/*

		 * The request queue is per-engine, so can contain requests

		 * from multiple ringbuffers. Here, we must ignore any that

		 * aren't from the ringbuffer we're considering.

		 */

		struct intel_context *ctx = request->ctx;

		if (ctx->engine[ring->id].ringbuf != ringbuf)

			continue;



		/* Would completion of this request free enough space? */

		if (__intel_ring_space(request->tail, ringbuf->tail,

				       ringbuf->size) >= bytes) {

			break;

		}

	}



	if (&request->list == &ring->request_list)

		return -ENOSPC;



	ret = i915_wait_request(request);

	if (ret)

		return ret;



	i915_gem_retire_requests_ring(ring);



	return intel_ring_space(ringbuf) >= bytes ? 0 : -ENOSPC;

}



/*

 * intel_logical_ring_advance_and_submit() - advance the tail and submit the workload

 * @ringbuf: Logical Ringbuffer to advance.

 *

 * The tail is updated in our logical ringbuffer struct, not in the actual context. What

 * really happens during submission is that the context and current tail will be placed

 * on a queue waiting for the ELSP to be ready to accept a new context submission. At that

 * point, the tail *inside* the context is updated and the ELSP written to.

 */

static void

intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf,

				      struct intel_context *ctx,

				      struct drm_i915_gem_request *request)

{

	struct intel_engine_cs *ring = ringbuf->ring;



	intel_logical_ring_advance(ringbuf);



	if (intel_ring_stopped(ring))

		return;



	execlists_context_queue(ring, ctx, ringbuf->tail, request);

}



static int logical_ring_wait_for_space(struct intel_ringbuffer *ringbuf,

				       struct intel_context *ctx,

				       int bytes)

{

	struct intel_engine_cs *ring = ringbuf->ring;

	struct drm_device *dev = ring->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	unsigned long end;

	int ret;



	ret = logical_ring_wait_request(ringbuf, bytes);

	if (ret != -ENOSPC)

		return ret;



	/* Force the context submission in case we have been skipping it */

	intel_logical_ring_advance_and_submit(ringbuf, ctx, NULL);



	/* With GEM the hangcheck timer should kick us out of the loop,

	 * leaving it early runs the risk of corrupting GEM state (due

	 * to running on almost untested codepaths). But on resume

	 * timers don't work yet, so prevent a complete hang in that

	 * case by choosing an insanely large timeout. */

	end = jiffies + 60 * HZ;



	ret = 0;

	do {

		if (intel_ring_space(ringbuf) >= bytes)

			break;



		msleep(1);



		if (dev_priv->mm.interruptible && signal_pending(current)) {

			ret = -ERESTARTSYS;

			break;

		}



		ret = i915_gem_check_wedge(&dev_priv->gpu_error,

					   dev_priv->mm.interruptible);

		if (ret)

			break;



		if (time_after(jiffies, end)) {

			ret = -EBUSY;

			break;

		}

	} while (1);



	return ret;

}



static int logical_ring_wrap_buffer(struct intel_ringbuffer *ringbuf,

				    struct intel_context *ctx)

{

	uint32_t __iomem *virt;

	int rem = ringbuf->size - ringbuf->tail;



	if (ringbuf->space < rem) {

		int ret = logical_ring_wait_for_space(ringbuf, ctx, rem);



		if (ret)

			return ret;

	}



	virt = ringbuf->virtual_start + ringbuf->tail;

	rem /= 4;

	while (rem--)

		iowrite32(MI_NOOP, virt++);



	ringbuf->tail = 0;

	intel_ring_update_space(ringbuf);



	return 0;

}



static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,

				struct intel_context *ctx, int bytes)

{

	int ret;



	if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) {

		ret = logical_ring_wrap_buffer(ringbuf, ctx);

		if (unlikely(ret))

			return ret;

	}



	if (unlikely(ringbuf->space < bytes)) {

		ret = logical_ring_wait_for_space(ringbuf, ctx, bytes);

		if (unlikely(ret))

			return ret;

	}



	return 0;

}



/**

 * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands

 *

 * @ringbuf: Logical ringbuffer.

 * @num_dwords: number of DWORDs that we plan to write to the ringbuffer.

 *

 * The ringbuffer might not be ready to accept the commands right away (maybe it needs to

 * be wrapped, or wait a bit for the tail to be updated). This function takes care of that

 * and also preallocates a request (every workload submission is still mediated through

 * requests, same as it did with legacy ringbuffer submission).

 *

 * Return: non-zero if the ringbuffer is not ready to be written to.

 */

static int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,

				    struct intel_context *ctx, int num_dwords)

{

	struct intel_engine_cs *ring = ringbuf->ring;

	struct drm_device *dev = ring->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	int ret;



	ret = i915_gem_check_wedge(&dev_priv->gpu_error,

				   dev_priv->mm.interruptible);

	if (ret)

		return ret;



	ret = logical_ring_prepare(ringbuf, ctx, num_dwords * sizeof(uint32_t));

	if (ret)

		return ret;



	/* Preallocate the olr before touching the ring */

	ret = logical_ring_alloc_request(ring, ctx);

	if (ret)

		return ret;



	ringbuf->space -= num_dwords * sizeof(uint32_t);

	return 0;

}



/**

 * execlists_submission() - submit a batchbuffer for execution, Execlists style

 * @dev: DRM device.
@@ -787,30 +1024,6 @@ int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf, 
	return 0;

}



/*

 * intel_logical_ring_advance_and_submit() - advance the tail and submit the workload

 * @ringbuf: Logical Ringbuffer to advance.

 *

 * The tail is updated in our logical ringbuffer struct, not in the actual context. What

 * really happens during submission is that the context and current tail will be placed

 * on a queue waiting for the ELSP to be ready to accept a new context submission. At that

 * point, the tail *inside* the context is updated and the ELSP written to.

 */

static void

intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf,

				      struct intel_context *ctx,

				      struct drm_i915_gem_request *request)

{

	struct intel_engine_cs *ring = ringbuf->ring;



	intel_logical_ring_advance(ringbuf);



	if (intel_ring_stopped(ring))

		return;



	execlists_context_queue(ring, ctx, ringbuf->tail, request);

}



static int intel_lr_context_pin(struct intel_engine_cs *ring,

		struct intel_context *ctx)

{
@@ -855,219 +1068,6 @@ void intel_lr_context_unpin(struct intel_engine_cs *ring, 
	}

}



static int logical_ring_alloc_request(struct intel_engine_cs *ring,

				      struct intel_context *ctx)

{

	struct drm_i915_gem_request *request;

	struct drm_i915_private *dev_private = ring->dev->dev_private;

	int ret;



	if (ring->outstanding_lazy_request)

		return 0;



	request = kzalloc(sizeof(*request), GFP_KERNEL);

	if (request == NULL)

		return -ENOMEM;



	if (ctx != ring->default_context) {

		ret = intel_lr_context_pin(ring, ctx);

		if (ret) {

			kfree(request);

			return ret;

		}

	}



	kref_init(&request->ref);

	request->ring = ring;

	request->uniq = dev_private->request_uniq++;



	ret = i915_gem_get_seqno(ring->dev, &request->seqno);

	if (ret) {

		intel_lr_context_unpin(ring, ctx);

		kfree(request);

		return ret;

	}



	request->ctx = ctx;

	i915_gem_context_reference(request->ctx);

	request->ringbuf = ctx->engine[ring->id].ringbuf;



	ring->outstanding_lazy_request = request;

	return 0;

}



static int logical_ring_wait_request(struct intel_ringbuffer *ringbuf,

				     int bytes)

{

	struct intel_engine_cs *ring = ringbuf->ring;

	struct drm_i915_gem_request *request;

	int ret;



	if (intel_ring_space(ringbuf) >= bytes)

		return 0;



	list_for_each_entry(request, &ring->request_list, list) {

		/*

		 * The request queue is per-engine, so can contain requests

		 * from multiple ringbuffers. Here, we must ignore any that

		 * aren't from the ringbuffer we're considering.

		 */

		struct intel_context *ctx = request->ctx;

		if (ctx->engine[ring->id].ringbuf != ringbuf)

			continue;



		/* Would completion of this request free enough space? */

		if (__intel_ring_space(request->tail, ringbuf->tail,

				       ringbuf->size) >= bytes) {

			break;

		}

	}



	if (&request->list == &ring->request_list)

		return -ENOSPC;



	ret = i915_wait_request(request);

	if (ret)

		return ret;



	i915_gem_retire_requests_ring(ring);



	return intel_ring_space(ringbuf) >= bytes ? 0 : -ENOSPC;

}



static int logical_ring_wait_for_space(struct intel_ringbuffer *ringbuf,

				       struct intel_context *ctx,

				       int bytes)

{

	struct intel_engine_cs *ring = ringbuf->ring;

	struct drm_device *dev = ring->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	unsigned long end;

	int ret;



	ret = logical_ring_wait_request(ringbuf, bytes);

	if (ret != -ENOSPC)

		return ret;



	/* Force the context submission in case we have been skipping it */

	intel_logical_ring_advance_and_submit(ringbuf, ctx, NULL);



	/* With GEM the hangcheck timer should kick us out of the loop,

	 * leaving it early runs the risk of corrupting GEM state (due

	 * to running on almost untested codepaths). But on resume

	 * timers don't work yet, so prevent a complete hang in that

	 * case by choosing an insanely large timeout. */

	end = jiffies + 60 * HZ;



	ret = 0;

	do {

		if (intel_ring_space(ringbuf) >= bytes)

			break;



		msleep(1);



		if (dev_priv->mm.interruptible && signal_pending(current)) {

			ret = -ERESTARTSYS;

			break;

		}



		ret = i915_gem_check_wedge(&dev_priv->gpu_error,

					   dev_priv->mm.interruptible);

		if (ret)

			break;



		if (time_after(jiffies, end)) {

			ret = -EBUSY;

			break;

		}

	} while (1);



	return ret;

}



static int logical_ring_wrap_buffer(struct intel_ringbuffer *ringbuf,

				    struct intel_context *ctx)

{

	uint32_t __iomem *virt;

	int rem = ringbuf->size - ringbuf->tail;



	if (ringbuf->space < rem) {

		int ret = logical_ring_wait_for_space(ringbuf, ctx, rem);



		if (ret)

			return ret;

	}



	virt = ringbuf->virtual_start + ringbuf->tail;

	rem /= 4;

	while (rem--)

		iowrite32(MI_NOOP, virt++);



	ringbuf->tail = 0;

	intel_ring_update_space(ringbuf);



	return 0;

}



static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,

				struct intel_context *ctx, int bytes)

{

	int ret;



	if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) {

		ret = logical_ring_wrap_buffer(ringbuf, ctx);

		if (unlikely(ret))

			return ret;

	}



	if (unlikely(ringbuf->space < bytes)) {

		ret = logical_ring_wait_for_space(ringbuf, ctx, bytes);

		if (unlikely(ret))

			return ret;

	}



	return 0;

}



/**

 * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands

 *

 * @ringbuf: Logical ringbuffer.

 * @num_dwords: number of DWORDs that we plan to write to the ringbuffer.

 *

 * The ringbuffer might not be ready to accept the commands right away (maybe it needs to

 * be wrapped, or wait a bit for the tail to be updated). This function takes care of that

 * and also preallocates a request (every workload submission is still mediated through

 * requests, same as it did with legacy ringbuffer submission).

 *

 * Return: non-zero if the ringbuffer is not ready to be written to.

 */

int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,

			     struct intel_context *ctx, int num_dwords)

{

	struct intel_engine_cs *ring = ringbuf->ring;

	struct drm_device *dev = ring->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	int ret;



	ret = i915_gem_check_wedge(&dev_priv->gpu_error,

				   dev_priv->mm.interruptible);

	if (ret)

		return ret;



	ret = logical_ring_prepare(ringbuf, ctx, num_dwords * sizeof(uint32_t));

	if (ret)

		return ret;



	/* Preallocate the olr before touching the ring */

	ret = logical_ring_alloc_request(ring, ctx);

	if (ret)

		return ret;



	ringbuf->space -= num_dwords * sizeof(uint32_t);

	return 0;

}



static int intel_logical_ring_workarounds_emit(struct intel_engine_cs *ring,

					       struct intel_context *ctx)

{

drivers/gpu/drm/i915/intel_lrc.h

+0 −3
Original line number Diff line number Diff line
@@ -63,9 +63,6 @@ static inline void intel_logical_ring_emit(struct intel_ringbuffer *ringbuf, 
	iowrite32(data, ringbuf->virtual_start + ringbuf->tail);

	ringbuf->tail += 4;

}

int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,

			     struct intel_context *ctx,

			     int num_dwords);



/* Logical Ring Contexts */

void intel_lr_context_free(struct intel_context *ctx);