[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 "drm.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"
	31	#include "drm.h"
	32	#include "radeon.h"
	33
15d3332f CK	34
	35	int radeon_semaphore_create(struct radeon_device *rdev,
	36	struct radeon_semaphore **semaphore)
	37	{
c1341e52	38	int r;
15d3332f	39
a8c05940	40	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
c1341e52	41	if (*semaphore == NULL) {
c1341e52 JG	42	return -ENOMEM;
c1341e52 JG	43	}
c507f7ef	44	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
a8c05940 JG	45	&(*semaphore)->sa_bo, 8, 8, true);
	46	if (r) {
	47	kfree(*semaphore);
	48	*semaphore = NULL;
	49	return r;
	50	}
	51	(*semaphore)->waiters = 0;
	52	(semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((semaphore)->sa_bo);
	53	((uint64_t)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
15d3332f CK	54	return 0;
	55	}
	56
	57	void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
	58	struct radeon_semaphore *semaphore)
	59	{
a8c05940	60	--semaphore->waiters;
e32eb50d	61	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
15d3332f CK	62	}
	63
	64	void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
	65	struct radeon_semaphore *semaphore)
	66	{
a8c05940	67	++semaphore->waiters;
e32eb50d	68	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
15d3332f CK	69	}
15d3332f CK	70
220907d9	71	/* caller must hold ring lock */
8f676c4c CK	72	int radeon_semaphore_sync_rings(struct radeon_device *rdev,
8f676c4c CK	73	struct radeon_semaphore *semaphore,
220907d9	74	int signaler, int waiter)
8f676c4c	75	{
220907d9	76	int r;
8f676c4c	77
220907d9 CK	78	/* no need to signal and wait on the same ring */
	79	if (signaler == waiter) {
	80	return 0;
d6999bc7	81	}
8f676c4c	82
220907d9 CK	83	/* prevent GPU deadlocks */
	84	if (!rdev->ring[signaler].ready) {
	85	dev_err(rdev->dev, "Trying to sync to a disabled ring!");
	86	return -EINVAL;
	87	}
8f676c4c	88
220907d9 CK	89	r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
	90	if (r) {
	91	return r;
8f676c4c	92	}
220907d9 CK	93	radeon_semaphore_emit_signal(rdev, signaler, semaphore);
220907d9 CK	94	radeon_ring_commit(rdev, &rdev->ring[signaler]);
8f676c4c	95
220907d9 CK	96	/* we assume caller has already allocated space on waiters ring */
220907d9 CK	97	radeon_semaphore_emit_wait(rdev, waiter, semaphore);
d6999bc7	98
8f676c4c	99	return 0;
8f676c4c CK	100	}
8f676c4c CK	101
15d3332f	102	void radeon_semaphore_free(struct radeon_device *rdev,
220907d9	103	struct radeon_semaphore **semaphore,
a8c05940	104	struct radeon_fence *fence)
15d3332f	105	{
220907d9	106	if (semaphore == NULL \|\| *semaphore == NULL) {
a8c05940 JG	107	return;
a8c05940 JG	108	}
220907d9	109	if ((*semaphore)->waiters > 0) {
a8c05940	110	dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
220907d9	111	" hardware lockup imminent!\n", *semaphore);
15d3332f	112	}
220907d9 CK	113	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
	114	kfree(*semaphore);
	115	*semaphore = NULL;
15d3332f	116	}