1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013-2016 Red Hat 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include <linux/dma-fence.h> 8 9 #include "msm_drv.h" 10 #include "msm_fence.h" 11 12 13 struct msm_fence_context * 14 msm_fence_context_alloc(struct drm_device *dev, const char *name) 15 { 16 struct msm_fence_context *fctx; 17 18 fctx = kzalloc(sizeof(*fctx), GFP_KERNEL); 19 if (!fctx) 20 return ERR_PTR(-ENOMEM); 21 22 fctx->dev = dev; 23 strncpy(fctx->name, name, sizeof(fctx->name)); 24 fctx->context = dma_fence_context_alloc(1); 25 init_waitqueue_head(&fctx->event); 26 spin_lock_init(&fctx->spinlock); 27 28 return fctx; 29 } 30 31 void msm_fence_context_free(struct msm_fence_context *fctx) 32 { 33 kfree(fctx); 34 } 35 36 static inline bool fence_completed(struct msm_fence_context *fctx, uint32_t fence) 37 { 38 return (int32_t)(fctx->completed_fence - fence) >= 0; 39 } 40 41 /* legacy path for WAIT_FENCE ioctl: */ 42 int msm_wait_fence(struct msm_fence_context *fctx, uint32_t fence, 43 ktime_t *timeout, bool interruptible) 44 { 45 int ret; 46 47 if (fence > fctx->last_fence) { 48 DRM_ERROR("%s: waiting on invalid fence: %u (of %u)\n", 49 fctx->name, fence, fctx->last_fence); 50 return -EINVAL; 51 } 52 53 if (!timeout) { 54 /* no-wait: */ 55 ret = fence_completed(fctx, fence) ? 0 : -EBUSY; 56 } else { 57 unsigned long remaining_jiffies = timeout_to_jiffies(timeout); 58 59 if (interruptible) 60 ret = wait_event_interruptible_timeout(fctx->event, 61 fence_completed(fctx, fence), 62 remaining_jiffies); 63 else 64 ret = wait_event_timeout(fctx->event, 65 fence_completed(fctx, fence), 66 remaining_jiffies); 67 68 if (ret == 0) { 69 DBG("timeout waiting for fence: %u (completed: %u)", 70 fence, fctx->completed_fence); 71 ret = -ETIMEDOUT; 72 } else if (ret != -ERESTARTSYS) { 73 ret = 0; 74 } 75 } 76 77 return ret; 78 } 79 80 /* called from workqueue */ 81 void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence) 82 { 83 spin_lock(&fctx->spinlock); 84 fctx->completed_fence = max(fence, fctx->completed_fence); 85 spin_unlock(&fctx->spinlock); 86 87 wake_up_all(&fctx->event); 88 } 89 90 struct msm_fence { 91 struct dma_fence base; 92 struct msm_fence_context *fctx; 93 }; 94 95 static inline struct msm_fence *to_msm_fence(struct dma_fence *fence) 96 { 97 return container_of(fence, struct msm_fence, base); 98 } 99 100 static const char *msm_fence_get_driver_name(struct dma_fence *fence) 101 { 102 return "msm"; 103 } 104 105 static const char *msm_fence_get_timeline_name(struct dma_fence *fence) 106 { 107 struct msm_fence *f = to_msm_fence(fence); 108 return f->fctx->name; 109 } 110 111 static bool msm_fence_signaled(struct dma_fence *fence) 112 { 113 struct msm_fence *f = to_msm_fence(fence); 114 return fence_completed(f->fctx, f->base.seqno); 115 } 116 117 static const struct dma_fence_ops msm_fence_ops = { 118 .get_driver_name = msm_fence_get_driver_name, 119 .get_timeline_name = msm_fence_get_timeline_name, 120 .signaled = msm_fence_signaled, 121 }; 122 123 struct dma_fence * 124 msm_fence_alloc(struct msm_fence_context *fctx) 125 { 126 struct msm_fence *f; 127 128 f = kzalloc(sizeof(*f), GFP_KERNEL); 129 if (!f) 130 return ERR_PTR(-ENOMEM); 131 132 f->fctx = fctx; 133 134 dma_fence_init(&f->base, &msm_fence_ops, &fctx->spinlock, 135 fctx->context, ++fctx->last_fence); 136 137 return &f->base; 138 } 139