129 /* Fetch and adjust GPU GET pointer
132  *  value >= 0, the adjusted GET pointer
133  *  -EINVAL if GET pointer currently outside main push buffer
145 	/* reset counter as long as GET is still advancing, this is  in READ_GET()
200 		uint32_t get = nvchan_rd32(chan, 0x88);  in nv50_dma_push_wait()  local
201 		if (get != prev_get) {  in nv50_dma_push_wait()
202 			prev_get = get;  in nv50_dma_push_wait()
212 		chan->dma.ib_free = get - chan->dma.ib_put;  in nv50_dma_push_wait()
231 		int get = READ_GET(chan, &prev_get, &cnt);  in nv50_dma_wait()  local
232 		if (unlikely(get < 0)) {  in nv50_dma_wait()
233 			if (get == -EINVAL)  in nv50_dma_wait()
236 			return get;  in nv50_dma_wait()
239 		if (get <= chan->dma.cur) {  in nv50_dma_wait()
246 				get = READ_GET(chan, &prev_get, &cnt);  in nv50_dma_wait()
247 				if (unlikely(get < 0)) {  in nv50_dma_wait()
248 					if (get == -EINVAL)  in nv50_dma_wait()
250 					return get;  in nv50_dma_wait()
252 			} while (get == 0);  in nv50_dma_wait()
257 		chan->dma.free = get - chan->dma.cur - 1;  in nv50_dma_wait()
267 	int cnt = 0, get;  in nouveau_dma_wait()  local
273 		get = READ_GET(chan, &prev_get, &cnt);  in nouveau_dma_wait()
274 		if (unlikely(get == -EBUSY))  in nouveau_dma_wait()
277 		/* loop until we have a usable GET pointer.  the value  in nouveau_dma_wait()
282 		 * the other case we discard GET is while the GPU is fetching  in nouveau_dma_wait()
286 		if (unlikely(get == -EINVAL) || get < NOUVEAU_DMA_SKIPS)  in nouveau_dma_wait()
289 		if (get <= chan->dma.cur) {  in nouveau_dma_wait()
291 			 * idle (GET == PUT) so we have free space up until  in nouveau_dma_wait()
300 			 * GET==PUT, in which case the below conditional will  in nouveau_dma_wait()
313 			/* wait for GET to depart from the skips area.  in nouveau_dma_wait()
314 			 * prevents writing GET==PUT and causing a race  in nouveau_dma_wait()
319 				get = READ_GET(chan, &prev_get, &cnt);  in nouveau_dma_wait()
320 				if (unlikely(get == -EBUSY))  in nouveau_dma_wait()
322 				if (unlikely(get == -EINVAL))  in nouveau_dma_wait()
324 			} while (get <= NOUVEAU_DMA_SKIPS);  in nouveau_dma_wait()
335 		 * current GET pointer.  the "- 1" is to ensure there's  in nouveau_dma_wait()
337 		 * push buffer if we require it.  we can never get GET == PUT  in nouveau_dma_wait()
340 		chan->dma.free = get - chan->dma.cur - 1;  in nouveau_dma_wait()