247 lines
6.5 KiB
C
247 lines
6.5 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2007 Ben Skeggs.
|
||
|
|
* All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
||
|
|
* a copy of this software and associated documentation files (the
|
||
|
|
* "Software"), to deal in the Software without restriction, including
|
||
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
||
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
||
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
||
|
|
* the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice (including the
|
||
|
|
* next paragraph) shall be included in all copies or substantial
|
||
|
|
* portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||
|
|
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
|
||
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
||
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "nouveau_drv.h"
|
||
|
|
#include "nouveau_dma.h"
|
||
|
|
#include "nouveau_vmm.h"
|
||
|
|
|
||
|
|
#include <nvif/user.h>
|
||
|
|
|
||
|
|
/* Fetch and adjust GPU GET pointer
|
||
|
|
*
|
||
|
|
* Returns:
|
||
|
|
* value >= 0, the adjusted GET pointer
|
||
|
|
* -EINVAL if GET pointer currently outside main push buffer
|
||
|
|
* -EBUSY if timeout exceeded
|
||
|
|
*/
|
||
|
|
static inline int
|
||
|
|
READ_GET(struct nouveau_channel *chan, uint64_t *prev_get, int *timeout)
|
||
|
|
{
|
||
|
|
uint64_t val;
|
||
|
|
|
||
|
|
val = nvif_rd32(chan->userd, chan->user_get);
|
||
|
|
if (chan->user_get_hi)
|
||
|
|
val |= (uint64_t)nvif_rd32(chan->userd, chan->user_get_hi) << 32;
|
||
|
|
|
||
|
|
/* reset counter as long as GET is still advancing, this is
|
||
|
|
* to avoid misdetecting a GPU lockup if the GPU happens to
|
||
|
|
* just be processing an operation that takes a long time
|
||
|
|
*/
|
||
|
|
if (val != *prev_get) {
|
||
|
|
*prev_get = val;
|
||
|
|
*timeout = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((++*timeout & 0xff) == 0) {
|
||
|
|
udelay(1);
|
||
|
|
if (*timeout > 100000)
|
||
|
|
return -EBUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (val < chan->push.addr ||
|
||
|
|
val > chan->push.addr + (chan->dma.max << 2))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return (val - chan->push.addr) >> 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
nv50_dma_push(struct nouveau_channel *chan, u64 offset, int length)
|
||
|
|
{
|
||
|
|
struct nvif_user *user = &chan->drm->client.device.user;
|
||
|
|
struct nouveau_bo *pb = chan->push.buffer;
|
||
|
|
int ip = (chan->dma.ib_put * 2) + chan->dma.ib_base;
|
||
|
|
|
||
|
|
BUG_ON(chan->dma.ib_free < 1);
|
||
|
|
|
||
|
|
nouveau_bo_wr32(pb, ip++, lower_32_bits(offset));
|
||
|
|
nouveau_bo_wr32(pb, ip++, upper_32_bits(offset) | length << 8);
|
||
|
|
|
||
|
|
chan->dma.ib_put = (chan->dma.ib_put + 1) & chan->dma.ib_max;
|
||
|
|
|
||
|
|
mb();
|
||
|
|
/* Flush writes. */
|
||
|
|
nouveau_bo_rd32(pb, 0);
|
||
|
|
|
||
|
|
nvif_wr32(chan->userd, 0x8c, chan->dma.ib_put);
|
||
|
|
if (user->func && user->func->doorbell)
|
||
|
|
user->func->doorbell(user, chan->token);
|
||
|
|
chan->dma.ib_free--;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
nv50_dma_push_wait(struct nouveau_channel *chan, int count)
|
||
|
|
{
|
||
|
|
uint32_t cnt = 0, prev_get = 0;
|
||
|
|
|
||
|
|
while (chan->dma.ib_free < count) {
|
||
|
|
uint32_t get = nvif_rd32(chan->userd, 0x88);
|
||
|
|
if (get != prev_get) {
|
||
|
|
prev_get = get;
|
||
|
|
cnt = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((++cnt & 0xff) == 0) {
|
||
|
|
udelay(1);
|
||
|
|
if (cnt > 100000)
|
||
|
|
return -EBUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
chan->dma.ib_free = get - chan->dma.ib_put;
|
||
|
|
if (chan->dma.ib_free <= 0)
|
||
|
|
chan->dma.ib_free += chan->dma.ib_max;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
nv50_dma_wait(struct nouveau_channel *chan, int slots, int count)
|
||
|
|
{
|
||
|
|
uint64_t prev_get = 0;
|
||
|
|
int ret, cnt = 0;
|
||
|
|
|
||
|
|
ret = nv50_dma_push_wait(chan, slots + 1);
|
||
|
|
if (unlikely(ret))
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
while (chan->dma.free < count) {
|
||
|
|
int get = READ_GET(chan, &prev_get, &cnt);
|
||
|
|
if (unlikely(get < 0)) {
|
||
|
|
if (get == -EINVAL)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
return get;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (get <= chan->dma.cur) {
|
||
|
|
chan->dma.free = chan->dma.max - chan->dma.cur;
|
||
|
|
if (chan->dma.free >= count)
|
||
|
|
break;
|
||
|
|
|
||
|
|
FIRE_RING(chan);
|
||
|
|
do {
|
||
|
|
get = READ_GET(chan, &prev_get, &cnt);
|
||
|
|
if (unlikely(get < 0)) {
|
||
|
|
if (get == -EINVAL)
|
||
|
|
continue;
|
||
|
|
return get;
|
||
|
|
}
|
||
|
|
} while (get == 0);
|
||
|
|
chan->dma.cur = 0;
|
||
|
|
chan->dma.put = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
chan->dma.free = get - chan->dma.cur - 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
nouveau_dma_wait(struct nouveau_channel *chan, int slots, int size)
|
||
|
|
{
|
||
|
|
uint64_t prev_get = 0;
|
||
|
|
int cnt = 0, get;
|
||
|
|
|
||
|
|
if (chan->dma.ib_max)
|
||
|
|
return nv50_dma_wait(chan, slots, size);
|
||
|
|
|
||
|
|
while (chan->dma.free < size) {
|
||
|
|
get = READ_GET(chan, &prev_get, &cnt);
|
||
|
|
if (unlikely(get == -EBUSY))
|
||
|
|
return -EBUSY;
|
||
|
|
|
||
|
|
/* loop until we have a usable GET pointer. the value
|
||
|
|
* we read from the GPU may be outside the main ring if
|
||
|
|
* PFIFO is processing a buffer called from the main ring,
|
||
|
|
* discard these values until something sensible is seen.
|
||
|
|
*
|
||
|
|
* the other case we discard GET is while the GPU is fetching
|
||
|
|
* from the SKIPS area, so the code below doesn't have to deal
|
||
|
|
* with some fun corner cases.
|
||
|
|
*/
|
||
|
|
if (unlikely(get == -EINVAL) || get < NOUVEAU_DMA_SKIPS)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (get <= chan->dma.cur) {
|
||
|
|
/* engine is fetching behind us, or is completely
|
||
|
|
* idle (GET == PUT) so we have free space up until
|
||
|
|
* the end of the push buffer
|
||
|
|
*
|
||
|
|
* we can only hit that path once per call due to
|
||
|
|
* looping back to the beginning of the push buffer,
|
||
|
|
* we'll hit the fetching-ahead-of-us path from that
|
||
|
|
* point on.
|
||
|
|
*
|
||
|
|
* the *one* exception to that rule is if we read
|
||
|
|
* GET==PUT, in which case the below conditional will
|
||
|
|
* always succeed and break us out of the wait loop.
|
||
|
|
*/
|
||
|
|
chan->dma.free = chan->dma.max - chan->dma.cur;
|
||
|
|
if (chan->dma.free >= size)
|
||
|
|
break;
|
||
|
|
|
||
|
|
/* not enough space left at the end of the push buffer,
|
||
|
|
* instruct the GPU to jump back to the start right
|
||
|
|
* after processing the currently pending commands.
|
||
|
|
*/
|
||
|
|
OUT_RING(chan, chan->push.addr | 0x20000000);
|
||
|
|
|
||
|
|
/* wait for GET to depart from the skips area.
|
||
|
|
* prevents writing GET==PUT and causing a race
|
||
|
|
* condition that causes us to think the GPU is
|
||
|
|
* idle when it's not.
|
||
|
|
*/
|
||
|
|
do {
|
||
|
|
get = READ_GET(chan, &prev_get, &cnt);
|
||
|
|
if (unlikely(get == -EBUSY))
|
||
|
|
return -EBUSY;
|
||
|
|
if (unlikely(get == -EINVAL))
|
||
|
|
continue;
|
||
|
|
} while (get <= NOUVEAU_DMA_SKIPS);
|
||
|
|
WRITE_PUT(NOUVEAU_DMA_SKIPS);
|
||
|
|
|
||
|
|
/* we're now submitting commands at the start of
|
||
|
|
* the push buffer.
|
||
|
|
*/
|
||
|
|
chan->dma.cur =
|
||
|
|
chan->dma.put = NOUVEAU_DMA_SKIPS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* engine fetching ahead of us, we have space up until the
|
||
|
|
* current GET pointer. the "- 1" is to ensure there's
|
||
|
|
* space left to emit a jump back to the beginning of the
|
||
|
|
* push buffer if we require it. we can never get GET == PUT
|
||
|
|
* here, so this is safe.
|
||
|
|
*/
|
||
|
|
chan->dma.free = get - chan->dma.cur - 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|