2 * Copyright (C) 2007 Ben Skeggs.
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 "nouveau_drv.h"
28 #include "nouveau_dma.h"
29 #include "nouveau_vmm.h"
31 #include <nvif/user.h>
34 OUT_RINGp(struct nouveau_channel *chan, const void *data, unsigned nr_dwords)
37 u32 *mem = ttm_kmap_obj_virtual(&chan->push.buffer->kmap, &is_iomem);
38 mem = &mem[chan->dma.cur];
40 memcpy_toio((void __force __iomem *)mem, data, nr_dwords * 4);
42 memcpy(mem, data, nr_dwords * 4);
43 chan->dma.cur += nr_dwords;
46 /* Fetch and adjust GPU GET pointer
49 * value >= 0, the adjusted GET pointer
50 * -EINVAL if GET pointer currently outside main push buffer
51 * -EBUSY if timeout exceeded
54 READ_GET(struct nouveau_channel *chan, uint64_t *prev_get, int *timeout)
58 val = nvif_rd32(&chan->user, chan->user_get);
59 if (chan->user_get_hi)
60 val |= (uint64_t)nvif_rd32(&chan->user, chan->user_get_hi) << 32;
62 /* reset counter as long as GET is still advancing, this is
63 * to avoid misdetecting a GPU lockup if the GPU happens to
64 * just be processing an operation that takes a long time
66 if (val != *prev_get) {
71 if ((++*timeout & 0xff) == 0) {
73 if (*timeout > 100000)
77 if (val < chan->push.addr ||
78 val > chan->push.addr + (chan->dma.max << 2))
81 return (val - chan->push.addr) >> 2;
85 nv50_dma_push(struct nouveau_channel *chan, u64 offset, int length)
87 struct nvif_user *user = &chan->drm->client.device.user;
88 struct nouveau_bo *pb = chan->push.buffer;
89 int ip = (chan->dma.ib_put * 2) + chan->dma.ib_base;
91 BUG_ON(chan->dma.ib_free < 1);
93 nouveau_bo_wr32(pb, ip++, lower_32_bits(offset));
94 nouveau_bo_wr32(pb, ip++, upper_32_bits(offset) | length << 8);
96 chan->dma.ib_put = (chan->dma.ib_put + 1) & chan->dma.ib_max;
100 nouveau_bo_rd32(pb, 0);
102 nvif_wr32(&chan->user, 0x8c, chan->dma.ib_put);
103 if (user->func && user->func->doorbell)
104 user->func->doorbell(user, chan->token);
109 nv50_dma_push_wait(struct nouveau_channel *chan, int count)
111 uint32_t cnt = 0, prev_get = 0;
113 while (chan->dma.ib_free < count) {
114 uint32_t get = nvif_rd32(&chan->user, 0x88);
115 if (get != prev_get) {
120 if ((++cnt & 0xff) == 0) {
126 chan->dma.ib_free = get - chan->dma.ib_put;
127 if (chan->dma.ib_free <= 0)
128 chan->dma.ib_free += chan->dma.ib_max;
135 nv50_dma_wait(struct nouveau_channel *chan, int slots, int count)
137 uint64_t prev_get = 0;
140 ret = nv50_dma_push_wait(chan, slots + 1);
144 while (chan->dma.free < count) {
145 int get = READ_GET(chan, &prev_get, &cnt);
146 if (unlikely(get < 0)) {
153 if (get <= chan->dma.cur) {
154 chan->dma.free = chan->dma.max - chan->dma.cur;
155 if (chan->dma.free >= count)
160 get = READ_GET(chan, &prev_get, &cnt);
161 if (unlikely(get < 0)) {
171 chan->dma.free = get - chan->dma.cur - 1;
178 nouveau_dma_wait(struct nouveau_channel *chan, int slots, int size)
180 uint64_t prev_get = 0;
183 if (chan->dma.ib_max)
184 return nv50_dma_wait(chan, slots, size);
186 while (chan->dma.free < size) {
187 get = READ_GET(chan, &prev_get, &cnt);
188 if (unlikely(get == -EBUSY))
191 /* loop until we have a usable GET pointer. the value
192 * we read from the GPU may be outside the main ring if
193 * PFIFO is processing a buffer called from the main ring,
194 * discard these values until something sensible is seen.
196 * the other case we discard GET is while the GPU is fetching
197 * from the SKIPS area, so the code below doesn't have to deal
198 * with some fun corner cases.
200 if (unlikely(get == -EINVAL) || get < NOUVEAU_DMA_SKIPS)
203 if (get <= chan->dma.cur) {
204 /* engine is fetching behind us, or is completely
205 * idle (GET == PUT) so we have free space up until
206 * the end of the push buffer
208 * we can only hit that path once per call due to
209 * looping back to the beginning of the push buffer,
210 * we'll hit the fetching-ahead-of-us path from that
213 * the *one* exception to that rule is if we read
214 * GET==PUT, in which case the below conditional will
215 * always succeed and break us out of the wait loop.
217 chan->dma.free = chan->dma.max - chan->dma.cur;
218 if (chan->dma.free >= size)
221 /* not enough space left at the end of the push buffer,
222 * instruct the GPU to jump back to the start right
223 * after processing the currently pending commands.
225 OUT_RING(chan, chan->push.addr | 0x20000000);
227 /* wait for GET to depart from the skips area.
228 * prevents writing GET==PUT and causing a race
229 * condition that causes us to think the GPU is
230 * idle when it's not.
233 get = READ_GET(chan, &prev_get, &cnt);
234 if (unlikely(get == -EBUSY))
236 if (unlikely(get == -EINVAL))
238 } while (get <= NOUVEAU_DMA_SKIPS);
239 WRITE_PUT(NOUVEAU_DMA_SKIPS);
241 /* we're now submitting commands at the start of
245 chan->dma.put = NOUVEAU_DMA_SKIPS;
248 /* engine fetching ahead of us, we have space up until the
249 * current GET pointer. the "- 1" is to ensure there's
250 * space left to emit a jump back to the beginning of the
251 * push buffer if we require it. we can never get GET == PUT
252 * here, so this is safe.
254 chan->dma.free = get - chan->dma.cur - 1;