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#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30/*
31 * Authors:
32 *    Christian König <deathsimple@vodafone.de>
33 */
34#include <dev/drm2/drmP.h>
35#include "radeon.h"
36
37
38int radeon_semaphore_create(struct radeon_device *rdev,
39			    struct radeon_semaphore **semaphore)
40{
41	int r;
42
43	*semaphore = malloc(sizeof(struct radeon_semaphore),
44	    DRM_MEM_DRIVER, M_NOWAIT);
45	if (*semaphore == NULL) {
46		return -ENOMEM;
47	}
48	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
49			     &(*semaphore)->sa_bo, 8, 8, true);
50	if (r) {
51		free(*semaphore, DRM_MEM_DRIVER);
52		*semaphore = NULL;
53		return r;
54	}
55	(*semaphore)->waiters = 0;
56	(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
57	*((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
58	return 0;
59}
60
61void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
62			          struct radeon_semaphore *semaphore)
63{
64	--semaphore->waiters;
65	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
66}
67
68void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
69			        struct radeon_semaphore *semaphore)
70{
71	++semaphore->waiters;
72	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
73}
74
75/* caller must hold ring lock */
76int radeon_semaphore_sync_rings(struct radeon_device *rdev,
77				struct radeon_semaphore *semaphore,
78				int signaler, int waiter)
79{
80	int r;
81
82	/* no need to signal and wait on the same ring */
83	if (signaler == waiter) {
84		return 0;
85	}
86
87	/* prevent GPU deadlocks */
88	if (!rdev->ring[signaler].ready) {
89		dev_err(rdev->dev, "Trying to sync to a disabled ring!");
90		return -EINVAL;
91	}
92
93	r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
94	if (r) {
95		return r;
96	}
97	radeon_semaphore_emit_signal(rdev, signaler, semaphore);
98	radeon_ring_commit(rdev, &rdev->ring[signaler]);
99
100	/* we assume caller has already allocated space on waiters ring */
101	radeon_semaphore_emit_wait(rdev, waiter, semaphore);
102
103	/* for debugging lockup only, used by sysfs debug files */
104	rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr;
105	rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr;
106
107	return 0;
108}
109
110void radeon_semaphore_free(struct radeon_device *rdev,
111			   struct radeon_semaphore **semaphore,
112			   struct radeon_fence *fence)
113{
114	if (semaphore == NULL || *semaphore == NULL) {
115		return;
116	}
117	if ((*semaphore)->waiters > 0) {
118		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
119			" hardware lockup imminent!\n", *semaphore);
120	}
121	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
122	free(*semaphore, DRM_MEM_DRIVER);
123	*semaphore = NULL;
124}
125