[deliverable/linux.git] / drivers / gpu / drm / radeon / radeon_semaphore.c

/*
 * Copyright 2011 Christian König.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors:
 *    Christian König <deathsimple@vodafone.de>
 */
#include "drmP.h"
#include "radeon.h"


int radeon_semaphore_create(struct radeon_device *rdev,
			    struct radeon_semaphore **semaphore)
{
	int r;

	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
	if (*semaphore == NULL) {
		return -ENOMEM;
	}
	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
			     &(*semaphore)->sa_bo, 8, 8, true);
	if (r) {
		kfree(*semaphore);
		*semaphore = NULL;
		return r;
	}
	(*semaphore)->waiters = 0;
	(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
	*((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
	return 0;
}

void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
			          struct radeon_semaphore *semaphore)
{
	--semaphore->waiters;
	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
}

void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
			        struct radeon_semaphore *semaphore)
{
	++semaphore->waiters;
	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
}

/* caller must hold ring lock */
int radeon_semaphore_sync_rings(struct radeon_device *rdev,
				struct radeon_semaphore *semaphore,
				int signaler, int waiter)
{
	int r;

	/* no need to signal and wait on the same ring */
	if (signaler == waiter) {
		return 0;
	}

	/* prevent GPU deadlocks */
	if (!rdev->ring[signaler].ready) {
		dev_err(rdev->dev, "Trying to sync to a disabled ring!");
		return -EINVAL;
	}

	r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
	if (r) {
		return r;
	}
	radeon_semaphore_emit_signal(rdev, signaler, semaphore);
	radeon_ring_commit(rdev, &rdev->ring[signaler]);

	/* we assume caller has already allocated space on waiters ring */
	radeon_semaphore_emit_wait(rdev, waiter, semaphore);

	return 0;
}

void radeon_semaphore_free(struct radeon_device *rdev,
			   struct radeon_semaphore **semaphore,
			   struct radeon_fence *fence)
{
	if (semaphore == NULL || *semaphore == NULL) {
		return;
	}
	if ((*semaphore)->waiters > 0) {
		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
			" hardware lockup imminent!\n", *semaphore);
	}
	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
	kfree(*semaphore);
	*semaphore = NULL;
}
Commit	Line	Data
15d3332f CK	1	/*
	2	* Copyright 2011 Christian König.
	3	* All Rights Reserved.
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the
	7	* "Software"), to deal in the Software without restriction, including
	8	* without limitation the rights to use, copy, modify, merge, publish,
	9	* distribute, sub license, and/or sell copies of the Software, and to
	10	* permit persons to whom the Software is furnished to do so, subject to
	11	* the following conditions:
	12	*
	13	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	14	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	15	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	16	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	17	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	18	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	19	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	20	*
	21	* The above copyright notice and this permission notice (including the
	22	* next paragraph) shall be included in all copies or substantial portions
	23	* of the Software.
	24	*
	25	*/
	26	/*
	27	* Authors:
	28	* Christian König <deathsimple@vodafone.de>
	29	*/
	30	#include "drmP.h"
15d3332f CK	31	#include "radeon.h"
15d3332f CK	32
15d3332f CK	33
	34	int radeon_semaphore_create(struct radeon_device *rdev,
	35	struct radeon_semaphore **semaphore)
	36	{
c1341e52	37	int r;
15d3332f	38
a8c05940	39	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
c1341e52	40	if (*semaphore == NULL) {
c1341e52 JG	41	return -ENOMEM;
c1341e52 JG	42	}
c507f7ef	43	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
a8c05940 JG	44	&(*semaphore)->sa_bo, 8, 8, true);
	45	if (r) {
	46	kfree(*semaphore);
	47	*semaphore = NULL;
	48	return r;
	49	}
	50	(*semaphore)->waiters = 0;
	51	(semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((semaphore)->sa_bo);
	52	((uint64_t)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
15d3332f CK	53	return 0;
	54	}
	55
	56	void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
	57	struct radeon_semaphore *semaphore)
	58	{
a8c05940	59	--semaphore->waiters;
e32eb50d	60	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
15d3332f CK	61	}
	62
	63	void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
	64	struct radeon_semaphore *semaphore)
	65	{
a8c05940	66	++semaphore->waiters;
e32eb50d	67	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
15d3332f CK	68	}
15d3332f CK	69
220907d9	70	/* caller must hold ring lock */
8f676c4c CK	71	int radeon_semaphore_sync_rings(struct radeon_device *rdev,
8f676c4c CK	72	struct radeon_semaphore *semaphore,
220907d9	73	int signaler, int waiter)
8f676c4c	74	{
220907d9	75	int r;
8f676c4c	76
220907d9 CK	77	/* no need to signal and wait on the same ring */
	78	if (signaler == waiter) {
	79	return 0;
d6999bc7	80	}
8f676c4c	81
220907d9 CK	82	/* prevent GPU deadlocks */
	83	if (!rdev->ring[signaler].ready) {
	84	dev_err(rdev->dev, "Trying to sync to a disabled ring!");
	85	return -EINVAL;
	86	}
8f676c4c	87
220907d9 CK	88	r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
	89	if (r) {
	90	return r;
8f676c4c	91	}
220907d9 CK	92	radeon_semaphore_emit_signal(rdev, signaler, semaphore);
220907d9 CK	93	radeon_ring_commit(rdev, &rdev->ring[signaler]);
8f676c4c	94
220907d9 CK	95	/* we assume caller has already allocated space on waiters ring */
220907d9 CK	96	radeon_semaphore_emit_wait(rdev, waiter, semaphore);
d6999bc7	97
8f676c4c	98	return 0;
8f676c4c CK	99	}
8f676c4c CK	100
15d3332f	101	void radeon_semaphore_free(struct radeon_device *rdev,
220907d9	102	struct radeon_semaphore **semaphore,
a8c05940	103	struct radeon_fence *fence)
15d3332f	104	{
220907d9	105	if (semaphore == NULL \|\| *semaphore == NULL) {
a8c05940 JG	106	return;
a8c05940 JG	107	}
220907d9	108	if ((*semaphore)->waiters > 0) {
a8c05940	109	dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
220907d9	110	" hardware lockup imminent!\n", *semaphore);
15d3332f	111	}
220907d9 CK	112	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
	113	kfree(*semaphore);
	114	*semaphore = NULL;
15d3332f	115	}