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/*
* 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 "drmP.h"
#include "drm.h"
#include "nouveau_drv.h"
#include "nouveau_dma.h"
int
nouveau_dma_init(struct nouveau_channel *chan)
{
struct drm_device *dev = chan->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpuobj *m2mf = NULL;
int ret, i;
/* Create NV_MEMORY_TO_MEMORY_FORMAT for buffer moves */
ret = nouveau_gpuobj_gr_new(chan, dev_priv->card_type < NV_50 ?
0x0039 : 0x5039, &m2mf);
if (ret)
return ret;
ret = nouveau_gpuobj_ref_add(dev, chan, NvM2MF, m2mf, NULL);
if (ret)
return ret;
/* NV_MEMORY_TO_MEMORY_FORMAT requires a notifier object */
ret = nouveau_notifier_alloc(chan, NvNotify0, 32, &chan->m2mf_ntfy);
if (ret)
return ret;
/* Map push buffer */
ret = nouveau_bo_map(chan->pushbuf_bo);
if (ret)
return ret;
/* Map M2MF notifier object - fbcon. */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
ret = nouveau_bo_map(chan->notifier_bo);
if (ret)
return ret;
}
/* Initialise DMA vars */
chan->dma.max = (chan->pushbuf_bo->bo.mem.size >> 2) - 2;
chan->dma.put = 0;
chan->dma.cur = chan->dma.put;
chan->dma.free = chan->dma.max - chan->dma.cur;
/* Insert NOPS for NOUVEAU_DMA_SKIPS */
ret = RING_SPACE(chan, NOUVEAU_DMA_SKIPS);
if (ret)
return ret;
for (i = 0; i < NOUVEAU_DMA_SKIPS; i++)
OUT_RING(chan, 0);
/* Initialise NV_MEMORY_TO_MEMORY_FORMAT */
ret = RING_SPACE(chan, 4);
if (ret)
return ret;
BEGIN_RING(chan, NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_NAME, 1);
OUT_RING(chan, NvM2MF);
BEGIN_RING(chan, NvSubM2MF, NV_MEMORY_TO_MEMORY_FORMAT_DMA_NOTIFY, 1);
OUT_RING(chan, NvNotify0);
/* Sit back and pray the channel works.. */
FIRE_RING(chan);
return 0;
}
void
OUT_RINGp(struct nouveau_channel *chan, const void *data, unsigned nr_dwords)
{
bool is_iomem;
u32 *mem = ttm_kmap_obj_virtual(&chan->pushbuf_bo->kmap, &is_iomem);
mem = &mem[chan->dma.cur];
if (is_iomem)
memcpy_toio((void __force __iomem *)mem, data, nr_dwords * 4);
else
memcpy(mem, data, nr_dwords * 4);
chan->dma.cur += nr_dwords;
}
static inline bool
READ_GET(struct nouveau_channel *chan, uint32_t *get)
{
uint32_t val;
val = nvchan_rd32(chan, chan->user_get);
if (val < chan->pushbuf_base ||
val >= chan->pushbuf_base + chan->pushbuf_bo->bo.mem.size) {
/* meaningless to dma_wait() except to know whether the
* GPU has stalled or not
*/
*get = val;
return false;
}
*get = (val - chan->pushbuf_base) >> 2;
return true;
}
int
nouveau_dma_wait(struct nouveau_channel *chan, int size)
{
uint32_t get, prev_get = 0, cnt = 0;
bool get_valid;
while (chan->dma.free < size) {
/* 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
*/
get_valid = READ_GET(chan, &get);
if (get != prev_get) {
prev_get = get;
cnt = 0;
}
if ((++cnt & 0xff) == 0) {
DRM_UDELAY(1);
if (cnt > 100000)
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 (!get_valid || 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->pushbuf_base | 0x20000000);
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;
}
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