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/* SPDX-License-Identifier: MIT
*
* Copyright (c) 2025, NVIDIA CORPORATION. All rights reserved.
*/
#include <nvif/chan.h>
static void
nvif_chan_gpfifo_push_kick(struct nvif_push *push)
{
struct nvif_chan *chan = container_of(push, typeof(*chan), push);
u32 put = push->bgn - (u32 *)chan->push.mem.object.map.ptr;
u32 cnt;
if (chan->func->gpfifo.post) {
if (push->end - push->cur < chan->func->gpfifo.post_size)
push->end = push->cur + chan->func->gpfifo.post_size;
WARN_ON(nvif_chan_gpfifo_post(chan));
}
cnt = push->cur - push->bgn;
chan->func->gpfifo.push(chan, true, chan->push.addr + (put << 2), cnt << 2, false);
chan->func->gpfifo.kick(chan);
}
static int
nvif_chan_gpfifo_push_wait(struct nvif_push *push, u32 push_nr)
{
struct nvif_chan *chan = container_of(push, typeof(*chan), push);
return nvif_chan_gpfifo_wait(chan, 1, push_nr);
}
int
nvif_chan_gpfifo_post(struct nvif_chan *chan)
{
const u32 *map = chan->push.mem.object.map.ptr;
const u32 pbptr = (chan->push.cur - map) + chan->func->gpfifo.post_size;
const u32 gpptr = (chan->gpfifo.cur + 1) & chan->gpfifo.max;
if (!chan->func->gpfifo.post)
return 0;
return chan->func->gpfifo.post(chan, gpptr, pbptr);
}
void
nvif_chan_gpfifo_push(struct nvif_chan *chan, u64 addr, u32 size, bool no_prefetch)
{
chan->func->gpfifo.push(chan, false, addr, size, no_prefetch);
}
int
nvif_chan_gpfifo_wait(struct nvif_chan *chan, u32 gpfifo_nr, u32 push_nr)
{
struct nvif_push *push = &chan->push;
int ret = 0, time = 1000000;
if (gpfifo_nr) {
/* Account for pushbuf space needed by nvif_chan_gpfifo_post(),
* if used after pushing userspace GPFIFO entries.
*/
if (chan->func->gpfifo.post)
push_nr += chan->func->gpfifo.post_size;
}
/* Account for the GPFIFO entry needed to submit pushbuf. */
if (push_nr)
gpfifo_nr++;
/* Wait for space in main push buffer. */
if (push->cur + push_nr > push->end) {
ret = nvif_chan_dma_wait(chan, push_nr);
if (ret)
return ret;
}
/* Wait for GPFIFO space. */
while (chan->gpfifo.free < gpfifo_nr) {
chan->gpfifo.free = chan->func->gpfifo.read_get(chan) - chan->gpfifo.cur - 1;
if (chan->gpfifo.free < 0)
chan->gpfifo.free += chan->gpfifo.max + 1;
if (chan->gpfifo.free < gpfifo_nr) {
if (!time--)
return -ETIMEDOUT;
udelay(1);
}
}
return 0;
}
void
nvif_chan_gpfifo_ctor(const struct nvif_chan_func *func, void *userd, void *gpfifo, u32 gpfifo_size,
void *push, u64 push_addr, u32 push_size, struct nvif_chan *chan)
{
chan->func = func;
chan->userd.map.ptr = userd;
chan->gpfifo.map.ptr = gpfifo;
chan->gpfifo.max = (gpfifo_size >> 3) - 1;
chan->gpfifo.free = chan->gpfifo.max;
chan->push.mem.object.map.ptr = push;
chan->push.wait = nvif_chan_gpfifo_push_wait;
chan->push.kick = nvif_chan_gpfifo_push_kick;
chan->push.addr = push_addr;
chan->push.hw.max = push_size >> 2;
chan->push.bgn = chan->push.cur = chan->push.end = push;
}
int
nvif_chan_dma_wait(struct nvif_chan *chan, u32 nr)
{
struct nvif_push *push = &chan->push;
u32 cur = push->cur - (u32 *)push->mem.object.map.ptr;
u32 free, time = 1000000;
nr += chan->func->gpfifo.post_size;
do {
u32 get = chan->func->push.read_get(chan);
if (get <= cur) {
free = push->hw.max - cur;
if (free >= nr)
break;
PUSH_KICK(push);
while (get == 0) {
get = chan->func->push.read_get(chan);
if (get == 0) {
if (!time--)
return -ETIMEDOUT;
udelay(1);
}
}
cur = 0;
}
free = get - cur - 1;
if (free < nr) {
if (!time--)
return -ETIMEDOUT;
udelay(1);
}
} while (free < nr);
push->bgn = (u32 *)push->mem.object.map.ptr + cur;
push->cur = push->bgn;
push->end = push->bgn + free - chan->func->gpfifo.post_size;
return 0;
}
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