33 /* Fetch and adjust GPU GET pointer
36  *  value >= 0, the adjusted GET pointer
37  *  -EINVAL if GET pointer currently outside main push buffer
49 	/* reset counter as long as GET is still advancing, this is  in READ_GET()
101 		uint32_t get = nvif_rd32(&chan->user, 0x88);  in nv50_dma_push_wait()  local
102 		if (get != prev_get) {  in nv50_dma_push_wait()
103 			prev_get = get;  in nv50_dma_push_wait()
113 		chan->dma.ib_free = get - chan->dma.ib_put;  in nv50_dma_push_wait()
132 		int get = READ_GET(chan, &prev_get, &cnt);  in nv50_dma_wait()  local
133 		if (unlikely(get < 0)) {  in nv50_dma_wait()
134 			if (get == -EINVAL)  in nv50_dma_wait()
137 			return get;  in nv50_dma_wait()
140 		if (get <= chan->dma.cur) {  in nv50_dma_wait()
147 				get = READ_GET(chan, &prev_get, &cnt);  in nv50_dma_wait()
148 				if (unlikely(get < 0)) {  in nv50_dma_wait()
149 					if (get == -EINVAL)  in nv50_dma_wait()
151 					return get;  in nv50_dma_wait()
153 			} while (get == 0);  in nv50_dma_wait()
158 		chan->dma.free = get - chan->dma.cur - 1;  in nv50_dma_wait()
168 	int cnt = 0, get;  in nouveau_dma_wait()  local
174 		get = READ_GET(chan, &prev_get, &cnt);  in nouveau_dma_wait()
175 		if (unlikely(get == -EBUSY))  in nouveau_dma_wait()
178 		/* loop until we have a usable GET pointer.  the value  in nouveau_dma_wait()
183 		 * the other case we discard GET is while the GPU is fetching  in nouveau_dma_wait()
187 		if (unlikely(get == -EINVAL) || get < NOUVEAU_DMA_SKIPS)  in nouveau_dma_wait()
190 		if (get <= chan->dma.cur) {  in nouveau_dma_wait()
192 			 * idle (GET == PUT) so we have free space up until  in nouveau_dma_wait()
201 			 * GET==PUT, in which case the below conditional will  in nouveau_dma_wait()
214 			/* wait for GET to depart from the skips area.  in nouveau_dma_wait()
215 			 * prevents writing GET==PUT and causing a race  in nouveau_dma_wait()
220 				get = READ_GET(chan, &prev_get, &cnt);  in nouveau_dma_wait()
221 				if (unlikely(get == -EBUSY))  in nouveau_dma_wait()
223 				if (unlikely(get == -EINVAL))  in nouveau_dma_wait()
225 			} while (get <= NOUVEAU_DMA_SKIPS);  in nouveau_dma_wait()
236 		 * current GET pointer.  the "- 1" is to ensure there's  in nouveau_dma_wait()
238 		 * push buffer if we require it.  we can never get GET == PUT  in nouveau_dma_wait()
241 		chan->dma.free = get - chan->dma.cur - 1;  in nouveau_dma_wait()