Commit 0853695c authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm: Add reference counting to drm_atomic_state 



drm_atomic_state has a complicated single owner model that tracks the
single reference from allocation through to destruction on another
thread - or perhaps on a local error path. We can simplify this tracking
by using reference counting (at a cost of a few more atomics). This is
even more beneficial when the lifetime of the state becomes more
convoluted than being passed to a single worker thread for the commit.

v2: Double check !intel atomic_commit functions for missing gets
v3: Update kerneldocs

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: default avatarEric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: default avatarSean Paul <seanpaul@chromium.org>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161014121833.439-27-chris@chris-wilson.co.uk
parent 1dfdb0ed

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

+2 −1
Original line number Diff line number Diff line
@@ -464,7 +464,7 @@ atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit *commit) 


	drm_atomic_helper_cleanup_planes(dev, old_state);



	drm_atomic_state_free(old_state);

	drm_atomic_state_put(old_state);



	/* Complete the commit, wake up any waiter. */

	spin_lock(&dc->commit.wait.lock);
@@ -521,6 +521,7 @@ static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev, 
	/* Swap the state, this is the point of no return. */

	drm_atomic_helper_swap_state(state, true);



	drm_atomic_state_get(state);

	if (async)

		queue_work(dc->wq, &commit->work);

	else

drivers/gpu/drm/drm_atomic.c

+10 −15
Original line number Diff line number Diff line
@@ -74,6 +74,8 @@ EXPORT_SYMBOL(drm_atomic_state_default_release); 
int

drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)

{

	kref_init(&state->ref);



	/* TODO legacy paths should maybe do a better job about

	 * setting this appropriately?

	 */
@@ -215,22 +217,16 @@ void drm_atomic_state_clear(struct drm_atomic_state *state) 
EXPORT_SYMBOL(drm_atomic_state_clear);



/**

 * drm_atomic_state_free - free all memory for an atomic state

 * @state: atomic state to deallocate

 * __drm_atomic_state_free - free all memory for an atomic state

 * @ref: This atomic state to deallocate

 *

 * This frees all memory associated with an atomic state, including all the

 * per-object state for planes, crtcs and connectors.

 */

void drm_atomic_state_free(struct drm_atomic_state *state)

void __drm_atomic_state_free(struct kref *ref)

{

	struct drm_device *dev;

	struct drm_mode_config *config;



	if (!state)

		return;



	dev = state->dev;

	config = &dev->mode_config;

	struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);

	struct drm_mode_config *config = &state->dev->mode_config;



	drm_atomic_state_clear(state);
@@ -243,7 +239,7 @@ void drm_atomic_state_free(struct drm_atomic_state *state) 
		kfree(state);

	}

}

EXPORT_SYMBOL(drm_atomic_state_free);

EXPORT_SYMBOL(__drm_atomic_state_free);



/**

 * drm_atomic_get_crtc_state - get crtc state
@@ -1742,7 +1738,7 @@ retry: 
	if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {

		/*

		 * Unlike commit, check_only does not clean up state.

		 * Below we call drm_atomic_state_free for it.

		 * Below we call drm_atomic_state_put for it.

		 */

		ret = drm_atomic_check_only(state);

	} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
@@ -1775,8 +1771,7 @@ out: 
		goto retry;

	}



	if (ret || arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)

		drm_atomic_state_free(state);

	drm_atomic_state_put(state);



	drm_modeset_drop_locks(&ctx);

	drm_modeset_acquire_fini(&ctx);

drivers/gpu/drm/drm_atomic_helper.c

+24 −74
Original line number Diff line number Diff line
@@ -1208,7 +1208,7 @@ static void commit_tail(struct drm_atomic_state *state) 


	drm_atomic_helper_commit_cleanup_done(state);



	drm_atomic_state_free(state);

	drm_atomic_state_put(state);

}



static void commit_work(struct work_struct *work)
@@ -1290,6 +1290,7 @@ int drm_atomic_helper_commit(struct drm_device *dev, 
	 * make sure work items don't artifically stall on each another.

	 */



	drm_atomic_state_get(state);

	if (nonblock)

		queue_work(system_unbound_wq, &state->commit_work);

	else
@@ -1591,7 +1592,7 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done); 
 *

 * This signals completion of the atomic update @state, including any cleanup

 * work. If used, it must be called right before calling

 * drm_atomic_state_free().

 * drm_atomic_state_put().

 *

 * This is part of the atomic helper support for nonblocking commits, see

 * drm_atomic_helper_setup_commit() for an overview.
@@ -2114,18 +2115,13 @@ retry: 
		state->legacy_cursor_update = true;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2187,18 +2183,13 @@ retry: 
		goto fail;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2327,18 +2318,13 @@ retry: 
		goto fail;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2480,11 +2466,8 @@ int drm_atomic_helper_disable_all(struct drm_device *dev, 
	}



	err = drm_atomic_commit(state);



free:

	if (err < 0)

		drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return err;

}

EXPORT_SYMBOL(drm_atomic_helper_disable_all);
@@ -2535,7 +2518,7 @@ retry: 


	err = drm_atomic_helper_disable_all(dev, &ctx);

	if (err < 0) {

		drm_atomic_state_free(state);

		drm_atomic_state_put(state);

		state = ERR_PTR(err);

		goto unlock;

	}
@@ -2624,18 +2607,13 @@ retry: 
		goto fail;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2684,18 +2662,13 @@ retry: 
		goto fail;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2744,18 +2717,13 @@ retry: 
		goto fail;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2828,18 +2796,13 @@ retry: 
	}



	ret = drm_atomic_nonblocking_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -2915,19 +2878,14 @@ retry: 
	crtc_state->active = active;



	ret = drm_atomic_commit(state);

	if (ret != 0)

		goto fail;



	/* Driver takes ownership of state on successful commit. */

	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	connector->dpms = old_mode;

	drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);
@@ -3334,7 +3292,7 @@ drm_atomic_helper_duplicate_state(struct drm_device *dev, 


free:

	if (err < 0) {

		drm_atomic_state_free(state);

		drm_atomic_state_put(state);

		state = ERR_PTR(err);

	}
@@ -3449,22 +3407,14 @@ retry: 
		goto fail;



	ret = drm_atomic_commit(state);

	if (ret)

		goto fail;



	/* Driver takes ownership of state on successful commit. */



	drm_property_unreference_blob(blob);



	return 0;

fail:

	if (ret == -EDEADLK)

		goto backoff;



	drm_atomic_state_free(state);

	drm_atomic_state_put(state);

	drm_property_unreference_blob(blob);



	return ret;



backoff:

	drm_atomic_state_clear(state);

	drm_atomic_legacy_backoff(state);

drivers/gpu/drm/drm_fb_helper.c

+2 −7
Original line number Diff line number Diff line
@@ -367,9 +367,7 @@ fail: 
	if (ret == -EDEADLK)

		goto backoff;



	if (ret != 0)

		drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:
@@ -1361,16 +1359,13 @@ retry: 
	info->var.xoffset = var->xoffset;

	info->var.yoffset = var->yoffset;





fail:

	drm_atomic_clean_old_fb(dev, plane_mask, ret);



	if (ret == -EDEADLK)

		goto backoff;



	if (ret != 0)

		drm_atomic_state_free(state);



	drm_atomic_state_put(state);

	return ret;



backoff:

drivers/gpu/drm/exynos/exynos_drm_drv.c

+2 −1
Original line number Diff line number Diff line
@@ -69,7 +69,7 @@ static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit) 


	drm_atomic_helper_cleanup_planes(dev, state);



	drm_atomic_state_free(state);

	drm_atomic_state_put(state);



	spin_lock(&priv->lock);

	priv->pending &= ~commit->crtcs;
@@ -254,6 +254,7 @@ int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, 


	drm_atomic_helper_swap_state(state, true);



	drm_atomic_state_get(state);

	if (nonblock)

		schedule_work(&commit->work);

	else

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