drm/nouveau/nouveau_dma.c

41 READ_GET(struct nouveau_channel *chan, uint64_t *prev_get, int *timeout)
45 	val = nvif_rd32(chan->userd, chan->user_get);
46         if (chan->user_get_hi)
47 		val |= (uint64_t)nvif_rd32(chan->userd, chan->user_get_hi) << 32;
64 	if (val < chan->push.addr ||
65 	    val > chan->push.addr + (chan->dma.max << 2))
68 	return (val - chan->push.addr) >> 2;
72 nv50_dma_push(struct nouveau_channel *chan, u64 offset, u32 length,
75 	struct nvif_user *user = &chan->drm->client.device.user;
76 	struct nouveau_bo *pb = chan->push.buffer;
77 	int ip = (chan->dma.ib_put * 2) + chan->dma.ib_base;
79 	BUG_ON(chan->dma.ib_free < 1);
86 	chan->dma.ib_put = (chan->dma.ib_put + 1) & chan->dma.ib_max;
92 	nvif_wr32(chan->userd, 0x8c, chan->dma.ib_put);
94 		user->func->doorbell(user, chan->token);
95 	chan->dma.ib_free--;
99 nv50_dma_push_wait(struct nouveau_channel *chan, int count)
103 	while (chan->dma.ib_free < count) {
104 		uint32_t get = nvif_rd32(chan->userd, 0x88);
116 		chan->dma.ib_free = get - chan->dma.ib_put;
117 		if (chan->dma.ib_free <= 0)
118 			chan->dma.ib_free += chan->dma.ib_max;
125 nv50_dma_wait(struct nouveau_channel *chan, int slots, int count)
130 	ret = nv50_dma_push_wait(chan, slots + 1);
134 	while (chan->dma.free < count) {
135 		int get = READ_GET(chan, &prev_get, &cnt);
143 		if (get <= chan->dma.cur) {
144 			chan->dma.free = chan->dma.max - chan->dma.cur;
145 			if (chan->dma.free >= count)
148 			FIRE_RING(chan);
150 				get = READ_GET(chan, &prev_get, &cnt);
157 			chan->dma.cur = 0;
158 			chan->dma.put = 0;
161 		chan->dma.free = get - chan->dma.cur - 1;
168 nouveau_dma_wait(struct nouveau_channel *chan, int slots, int size)
173 	if (chan->dma.ib_max)
174 		return nv50_dma_wait(chan, slots, size);
176 	while (chan->dma.free < size) {
177 		get = READ_GET(chan, &prev_get, &cnt);
193 		if (get <= chan->dma.cur) {
207 			chan->dma.free = chan->dma.max - chan->dma.cur;
208 			if (chan->dma.free >= size)
215 			OUT_RING(chan, chan->push.addr | 0x20000000);
223 				get = READ_GET(chan, &prev_get, &cnt);
234 			chan->dma.cur  =
235 			chan->dma.put  = NOUVEAU_DMA_SKIPS;
244 		chan->dma.free = get - chan->dma.cur - 1;