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 * $FreeBSD: head/sys/dev/drm2/radeon/radeon_semaphore.c 254885 2013-08-25 19:37:15Z dumbbell $ 26 */ 27 28 /* 29 * Authors: 30 * Christian König <deathsimple@vodafone.de> 31 */ 32 #include <drm/drmP.h> 33 #include "radeon.h" 34 35 36 int radeon_semaphore_create(struct radeon_device *rdev, 37 struct radeon_semaphore **semaphore) 38 { 39 int r; 40 41 *semaphore = kmalloc(sizeof(struct radeon_semaphore), DRM_MEM_DRIVER, 42 M_WAITOK); 43 if (*semaphore == NULL) { 44 return -ENOMEM; 45 } 46 r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, 47 &(*semaphore)->sa_bo, 8, 8, true); 48 if (r) { 49 drm_free(*semaphore, DRM_MEM_DRIVER); 50 *semaphore = NULL; 51 return r; 52 } 53 (*semaphore)->waiters = 0; 54 (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo); 55 *((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0; 56 return 0; 57 } 58 59 void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring, 60 struct radeon_semaphore *semaphore) 61 { 62 --semaphore->waiters; 63 radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false); 64 } 65 66 void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring, 67 struct radeon_semaphore *semaphore) 68 { 69 ++semaphore->waiters; 70 radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true); 71 } 72 73 /* caller must hold ring lock */ 74 int radeon_semaphore_sync_rings(struct radeon_device *rdev, 75 struct radeon_semaphore *semaphore, 76 int signaler, int waiter) 77 { 78 int r; 79 80 /* no need to signal and wait on the same ring */ 81 if (signaler == waiter) { 82 return 0; 83 } 84 85 /* prevent GPU deadlocks */ 86 if (!rdev->ring[signaler].ready) { 87 dev_err(rdev->dev, "Trying to sync to a disabled ring!"); 88 return -EINVAL; 89 } 90 91 r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8); 92 if (r) { 93 return r; 94 } 95 radeon_semaphore_emit_signal(rdev, signaler, semaphore); 96 radeon_ring_commit(rdev, &rdev->ring[signaler]); 97 98 /* we assume caller has already allocated space on waiters ring */ 99 radeon_semaphore_emit_wait(rdev, waiter, semaphore); 100 101 /* for debugging lockup only, used by sysfs debug files */ 102 rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr; 103 rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr; 104 105 return 0; 106 } 107 108 void radeon_semaphore_free(struct radeon_device *rdev, 109 struct radeon_semaphore **semaphore, 110 struct radeon_fence *fence) 111 { 112 if (semaphore == NULL || *semaphore == NULL) { 113 return; 114 } 115 if ((*semaphore)->waiters > 0) { 116 dev_err(rdev->dev, "semaphore %p has more waiters than signalers," 117 " hardware lockup imminent!\n", *semaphore); 118 } 119 radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence); 120 drm_free(*semaphore, DRM_MEM_DRIVER); 121 *semaphore = NULL; 122 } 123