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
 31#include "radeon.h"
 32#include "radeon_trace.h"
 33
 34int radeon_semaphore_create(struct radeon_device *rdev,
 35			    struct radeon_semaphore **semaphore)
 36{
 37	int r;
 38
 39	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
 40	if (*semaphore == NULL) {
 41		return -ENOMEM;
 42	}
 43	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
 44			     &(*semaphore)->sa_bo, 8, 8);
 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
 53	*((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
 54
 55	return 0;
 56}
 57
 58bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
 59				  struct radeon_semaphore *semaphore)
 60{
 61	struct radeon_ring *ring = &rdev->ring[ridx];
 62
 63	trace_radeon_semaphore_signale(ridx, semaphore);
 64
 65	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
 66		--semaphore->waiters;
 67
 68		/* for debugging lockup only, used by sysfs debug files */
 69		ring->last_semaphore_signal_addr = semaphore->gpu_addr;
 70		return true;
 71	}
 72	return false;
 73}
 74
 75bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
 76				struct radeon_semaphore *semaphore)
 77{
 78	struct radeon_ring *ring = &rdev->ring[ridx];
 79
 80	trace_radeon_semaphore_wait(ridx, semaphore);
 81
 82	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
 83		++semaphore->waiters;
 84
 85		/* for debugging lockup only, used by sysfs debug files */
 86		ring->last_semaphore_wait_addr = semaphore->gpu_addr;
 87		return true;
 88	}
 89	return false;
 90}
 91
 92void radeon_semaphore_free(struct radeon_device *rdev,
 93			   struct radeon_semaphore **semaphore,
 94			   struct radeon_fence *fence)
 95{
 96	if (semaphore == NULL || *semaphore == NULL) {
 97		return;
 98	}
 99	if ((*semaphore)->waiters > 0) {
100		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
101			" hardware lockup imminent!\n", *semaphore);
102	}
103	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
104	kfree(*semaphore);
105	*semaphore = NULL;
106}