V4L/DVB: media/IR/imon: testing the wrong variable
[wandboard.git] / drivers / gpu / drm / nouveau / nouveau_fence.c
blobfaddf53ff9ed79f0804735c151a28c3fb2d9a7ec
1 /*
2 * Copyright (C) 2007 Ben Skeggs.
3 * All Rights Reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a 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, sublicense, 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:
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 #include "drmP.h"
28 #include "drm.h"
30 #include "nouveau_drv.h"
31 #include "nouveau_dma.h"
33 #define USE_REFCNT (dev_priv->card_type >= NV_10)
35 struct nouveau_fence {
36 struct nouveau_channel *channel;
37 struct kref refcount;
38 struct list_head entry;
40 uint32_t sequence;
41 bool signalled;
44 static inline struct nouveau_fence *
45 nouveau_fence(void *sync_obj)
47 return (struct nouveau_fence *)sync_obj;
50 static void
51 nouveau_fence_del(struct kref *ref)
53 struct nouveau_fence *fence =
54 container_of(ref, struct nouveau_fence, refcount);
56 kfree(fence);
59 void
60 nouveau_fence_update(struct nouveau_channel *chan)
62 struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
63 struct list_head *entry, *tmp;
64 struct nouveau_fence *fence;
65 uint32_t sequence;
67 if (USE_REFCNT)
68 sequence = nvchan_rd32(chan, 0x48);
69 else
70 sequence = chan->fence.last_sequence_irq;
72 if (chan->fence.sequence_ack == sequence)
73 return;
74 chan->fence.sequence_ack = sequence;
76 list_for_each_safe(entry, tmp, &chan->fence.pending) {
77 fence = list_entry(entry, struct nouveau_fence, entry);
79 sequence = fence->sequence;
80 fence->signalled = true;
81 list_del(&fence->entry);
82 kref_put(&fence->refcount, nouveau_fence_del);
84 if (sequence == chan->fence.sequence_ack)
85 break;
89 int
90 nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
91 bool emit)
93 struct nouveau_fence *fence;
94 int ret = 0;
96 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
97 if (!fence)
98 return -ENOMEM;
99 kref_init(&fence->refcount);
100 fence->channel = chan;
102 if (emit)
103 ret = nouveau_fence_emit(fence);
105 if (ret)
106 nouveau_fence_unref((void *)&fence);
107 *pfence = fence;
108 return ret;
111 struct nouveau_channel *
112 nouveau_fence_channel(struct nouveau_fence *fence)
114 return fence ? fence->channel : NULL;
118 nouveau_fence_emit(struct nouveau_fence *fence)
120 struct drm_nouveau_private *dev_priv = fence->channel->dev->dev_private;
121 struct nouveau_channel *chan = fence->channel;
122 unsigned long flags;
123 int ret;
125 ret = RING_SPACE(chan, 2);
126 if (ret)
127 return ret;
129 if (unlikely(chan->fence.sequence == chan->fence.sequence_ack - 1)) {
130 spin_lock_irqsave(&chan->fence.lock, flags);
131 nouveau_fence_update(chan);
132 spin_unlock_irqrestore(&chan->fence.lock, flags);
134 BUG_ON(chan->fence.sequence ==
135 chan->fence.sequence_ack - 1);
138 fence->sequence = ++chan->fence.sequence;
140 kref_get(&fence->refcount);
141 spin_lock_irqsave(&chan->fence.lock, flags);
142 list_add_tail(&fence->entry, &chan->fence.pending);
143 spin_unlock_irqrestore(&chan->fence.lock, flags);
145 BEGIN_RING(chan, NvSubSw, USE_REFCNT ? 0x0050 : 0x0150, 1);
146 OUT_RING(chan, fence->sequence);
147 FIRE_RING(chan);
149 return 0;
152 void
153 nouveau_fence_unref(void **sync_obj)
155 struct nouveau_fence *fence = nouveau_fence(*sync_obj);
157 if (fence)
158 kref_put(&fence->refcount, nouveau_fence_del);
159 *sync_obj = NULL;
162 void *
163 nouveau_fence_ref(void *sync_obj)
165 struct nouveau_fence *fence = nouveau_fence(sync_obj);
167 kref_get(&fence->refcount);
168 return sync_obj;
171 bool
172 nouveau_fence_signalled(void *sync_obj, void *sync_arg)
174 struct nouveau_fence *fence = nouveau_fence(sync_obj);
175 struct nouveau_channel *chan = fence->channel;
176 unsigned long flags;
178 if (fence->signalled)
179 return true;
181 spin_lock_irqsave(&chan->fence.lock, flags);
182 nouveau_fence_update(chan);
183 spin_unlock_irqrestore(&chan->fence.lock, flags);
184 return fence->signalled;
188 nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
190 unsigned long timeout = jiffies + (3 * DRM_HZ);
191 int ret = 0;
193 __set_current_state(intr ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
195 while (1) {
196 if (nouveau_fence_signalled(sync_obj, sync_arg))
197 break;
199 if (time_after_eq(jiffies, timeout)) {
200 ret = -EBUSY;
201 break;
204 if (lazy)
205 schedule_timeout(1);
207 if (intr && signal_pending(current)) {
208 ret = -ERESTARTSYS;
209 break;
213 __set_current_state(TASK_RUNNING);
215 return ret;
219 nouveau_fence_flush(void *sync_obj, void *sync_arg)
221 return 0;
224 void
225 nouveau_fence_handler(struct drm_device *dev, int channel)
227 struct drm_nouveau_private *dev_priv = dev->dev_private;
228 struct nouveau_channel *chan = NULL;
230 if (channel >= 0 && channel < dev_priv->engine.fifo.channels)
231 chan = dev_priv->fifos[channel];
233 if (chan) {
234 spin_lock_irq(&chan->fence.lock);
235 nouveau_fence_update(chan);
236 spin_unlock_irq(&chan->fence.lock);
241 nouveau_fence_init(struct nouveau_channel *chan)
243 INIT_LIST_HEAD(&chan->fence.pending);
244 spin_lock_init(&chan->fence.lock);
245 return 0;
248 void
249 nouveau_fence_fini(struct nouveau_channel *chan)
251 struct list_head *entry, *tmp;
252 struct nouveau_fence *fence;
254 list_for_each_safe(entry, tmp, &chan->fence.pending) {
255 fence = list_entry(entry, struct nouveau_fence, entry);
257 fence->signalled = true;
258 list_del(&fence->entry);
259 kref_put(&fence->refcount, nouveau_fence_del);