1 /* 2 * Copyright (C) 2013-2016 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <linux/dma-fence.h> 19 20 #include "msm_drv.h" 21 #include "msm_fence.h" 22 23 24 struct msm_fence_context * 25 msm_fence_context_alloc(struct drm_device *dev, const char *name) 26 { 27 struct msm_fence_context *fctx; 28 29 fctx = kzalloc(sizeof(*fctx), GFP_KERNEL); 30 if (!fctx) 31 return ERR_PTR(-ENOMEM); 32 33 fctx->dev = dev; 34 fctx->name = name; 35 fctx->context = dma_fence_context_alloc(1); 36 init_waitqueue_head(&fctx->event); 37 spin_lock_init(&fctx->spinlock); 38 39 return fctx; 40 } 41 42 void msm_fence_context_free(struct msm_fence_context *fctx) 43 { 44 kfree(fctx); 45 } 46 47 static inline bool fence_completed(struct msm_fence_context *fctx, uint32_t fence) 48 { 49 return (int32_t)(fctx->completed_fence - fence) >= 0; 50 } 51 52 /* legacy path for WAIT_FENCE ioctl: */ 53 int msm_wait_fence(struct msm_fence_context *fctx, uint32_t fence, 54 ktime_t *timeout, bool interruptible) 55 { 56 int ret; 57 58 if (fence > fctx->last_fence) { 59 DRM_ERROR("%s: waiting on invalid fence: %u (of %u)\n", 60 fctx->name, fence, fctx->last_fence); 61 return -EINVAL; 62 } 63 64 if (!timeout) { 65 /* no-wait: */ 66 ret = fence_completed(fctx, fence) ? 0 : -EBUSY; 67 } else { 68 unsigned long remaining_jiffies = timeout_to_jiffies(timeout); 69 70 if (interruptible) 71 ret = wait_event_interruptible_timeout(fctx->event, 72 fence_completed(fctx, fence), 73 remaining_jiffies); 74 else 75 ret = wait_event_timeout(fctx->event, 76 fence_completed(fctx, fence), 77 remaining_jiffies); 78 79 if (ret == 0) { 80 DBG("timeout waiting for fence: %u (completed: %u)", 81 fence, fctx->completed_fence); 82 ret = -ETIMEDOUT; 83 } else if (ret != -ERESTARTSYS) { 84 ret = 0; 85 } 86 } 87 88 return ret; 89 } 90 91 /* called from workqueue */ 92 void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence) 93 { 94 spin_lock(&fctx->spinlock); 95 fctx->completed_fence = max(fence, fctx->completed_fence); 96 spin_unlock(&fctx->spinlock); 97 98 wake_up_all(&fctx->event); 99 } 100 101 struct msm_fence { 102 struct msm_fence_context *fctx; 103 struct dma_fence base; 104 }; 105 106 static inline struct msm_fence *to_msm_fence(struct dma_fence *fence) 107 { 108 return container_of(fence, struct msm_fence, base); 109 } 110 111 static const char *msm_fence_get_driver_name(struct dma_fence *fence) 112 { 113 return "msm"; 114 } 115 116 static const char *msm_fence_get_timeline_name(struct dma_fence *fence) 117 { 118 struct msm_fence *f = to_msm_fence(fence); 119 return f->fctx->name; 120 } 121 122 static bool msm_fence_enable_signaling(struct dma_fence *fence) 123 { 124 return true; 125 } 126 127 static bool msm_fence_signaled(struct dma_fence *fence) 128 { 129 struct msm_fence *f = to_msm_fence(fence); 130 return fence_completed(f->fctx, f->base.seqno); 131 } 132 133 static void msm_fence_release(struct dma_fence *fence) 134 { 135 struct msm_fence *f = to_msm_fence(fence); 136 kfree_rcu(f, base.rcu); 137 } 138 139 static const struct dma_fence_ops msm_fence_ops = { 140 .get_driver_name = msm_fence_get_driver_name, 141 .get_timeline_name = msm_fence_get_timeline_name, 142 .enable_signaling = msm_fence_enable_signaling, 143 .signaled = msm_fence_signaled, 144 .wait = dma_fence_default_wait, 145 .release = msm_fence_release, 146 }; 147 148 struct dma_fence * 149 msm_fence_alloc(struct msm_fence_context *fctx) 150 { 151 struct msm_fence *f; 152 153 f = kzalloc(sizeof(*f), GFP_KERNEL); 154 if (!f) 155 return ERR_PTR(-ENOMEM); 156 157 f->fctx = fctx; 158 159 dma_fence_init(&f->base, &msm_fence_ops, &fctx->spinlock, 160 fctx->context, ++fctx->last_fence); 161 162 return &f->base; 163 } 164