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 <drm/drmP.h> 31 #include "radeon.h" 32 33 34 int radeon_semaphore_create(struct radeon_device *rdev, 35 struct radeon_semaphore **semaphore) 36 { 37 int r; 38 39 *semaphore = kmalloc(sizeof(struct radeon_semaphore), M_DRM, 40 M_WAITOK); 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 57 void 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 64 void 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 71 /* caller must hold ring lock */ 72 int radeon_semaphore_sync_rings(struct radeon_device *rdev, 73 struct radeon_semaphore *semaphore, 74 int signaler, int waiter) 75 { 76 int r; 77 78 /* no need to signal and wait on the same ring */ 79 if (signaler == waiter) { 80 return 0; 81 } 82 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 } 88 89 r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8); 90 if (r) { 91 return r; 92 } 93 radeon_semaphore_emit_signal(rdev, signaler, semaphore); 94 radeon_ring_commit(rdev, &rdev->ring[signaler]); 95 96 /* we assume caller has already allocated space on waiters ring */ 97 radeon_semaphore_emit_wait(rdev, waiter, semaphore); 98 99 /* for debugging lockup only, used by sysfs debug files */ 100 rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr; 101 rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr; 102 103 return 0; 104 } 105 106 void radeon_semaphore_free(struct radeon_device *rdev, 107 struct radeon_semaphore **semaphore, 108 struct radeon_fence *fence) 109 { 110 if (semaphore == NULL || *semaphore == NULL) { 111 return; 112 } 113 if ((*semaphore)->waiters > 0) { 114 dev_err(rdev->dev, "semaphore %p has more waiters than signalers," 115 " hardware lockup imminent!\n", *semaphore); 116 } 117 radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence); 118 kfree(*semaphore); 119 *semaphore = NULL; 120 } 121