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
 34
 35int radeon_semaphore_create(struct radeon_device *rdev,
 36			    struct radeon_semaphore **semaphore)
 37{
 38	int r;
 39
 40	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
 41	if (*semaphore == NULL) {
 42		return -ENOMEM;
 43	}
 44	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
 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;
 54	return 0;
 55}
 56
 57void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
 58			          struct radeon_semaphore *semaphore)
 59{
 60	--semaphore->waiters;
 61	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
 62}
 63
 64void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
 65			        struct radeon_semaphore *semaphore)
 66{
 67	++semaphore->waiters;
 68	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
 69}
 70
 71int radeon_semaphore_sync_rings(struct radeon_device *rdev,
 72				struct radeon_semaphore *semaphore,
 73				bool sync_to[RADEON_NUM_RINGS],
 74				int dst_ring)
 75{
 76	int i = 0, r;
 77
 78	mutex_lock(&rdev->ring_lock);
 79	r = radeon_ring_alloc(rdev, &rdev->ring[dst_ring], RADEON_NUM_RINGS * 8);
 80	if (r) {
 81		goto error;
 82	}
 83
 84	for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 85		/* no need to sync to our own or unused rings */
 86		if (!sync_to[i] || i == dst_ring)
 87			continue;
 88
 89		/* prevent GPU deadlocks */
 90		if (!rdev->ring[i].ready) {
 91			dev_err(rdev->dev, "Trying to sync to a disabled ring!");
 92			r = -EINVAL;
 93			goto error;
 94		}
 95
 96		r = radeon_ring_alloc(rdev, &rdev->ring[i], 8);
 97		if (r) {
 98			goto error;
 99		}
100
101		radeon_semaphore_emit_signal(rdev, i, semaphore);
102		radeon_semaphore_emit_wait(rdev, dst_ring, semaphore);
103
104		radeon_ring_commit(rdev, &rdev->ring[i]);
105	}
106
107	radeon_ring_commit(rdev, &rdev->ring[dst_ring]);
108	mutex_unlock(&rdev->ring_lock);
109
110	return 0;
111
112error:
113	/* unlock all locks taken so far */
114	for (--i; i >= 0; --i) {
115		if (sync_to[i] || i == dst_ring) {
116			radeon_ring_undo(&rdev->ring[i]);
117		}
118	}
119	radeon_ring_undo(&rdev->ring[dst_ring]);
120	mutex_unlock(&rdev->ring_lock);
121	return r;
122}
123
124void radeon_semaphore_free(struct radeon_device *rdev,
125			   struct radeon_semaphore *semaphore,
126			   struct radeon_fence *fence)
127{
128	if (semaphore == NULL) {
129		return;
130	}
131	if (semaphore->waiters > 0) {
132		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
133			" hardware lockup imminent!\n", semaphore);
134	}
135	radeon_sa_bo_free(rdev, &semaphore->sa_bo, fence);
136	kfree(semaphore);
137}