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drm/nouveau: handle fifo pusher errors better

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The most important part of this change is that we now instruct PFIFO to
drop all pending fetches, rather than attempting to skip a single dword
and hope that things would magically sort themselves out - they usually
don't, and we end up with PFIFO being completely hung.

This commit also adds somewhat more useful logging when these exceptions
occur.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-09-08 15:40:30 +10:00
parent e1429b4c3c
commit e071f8cd71
1 changed files with 37 additions and 8 deletions
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45
drivers/gpu/drm/nouveau/nouveau_irq.c
View file

@ -202,16 +202,45 @@ nouveau_fifo_irq_handler(struct drm_device *dev)
}
if (status & NV_PFIFO_INTR_DMA_PUSHER) {
NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d\n", chid);
u32 get = nv_rd32(dev, 0x003244);
u32 put = nv_rd32(dev, 0x003240);
u32 push = nv_rd32(dev, 0x003220);
u32 state = nv_rd32(dev, 0x003228);
if (dev_priv->card_type == NV_50) {
u32 ho_get = nv_rd32(dev, 0x003328);
u32 ho_put = nv_rd32(dev, 0x003320);
u32 ib_get = nv_rd32(dev, 0x003334);
u32 ib_put = nv_rd32(dev, 0x003330);
NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d Get 0x%02x%08x "
"Put 0x%02x%08x IbGet 0x%08x IbPut 0x%08x "
"State 0x%08x Push 0x%08x\n",
chid, ho_get, get, ho_put, put, ib_get, ib_put,
state, push);
/* METHOD_COUNT, in DMA_STATE on earlier chipsets */
nv_wr32(dev, 0x003364, 0x00000000);
if (get != put || ho_get != ho_put) {
nv_wr32(dev, 0x003244, put);
nv_wr32(dev, 0x003328, ho_put);
} else
if (ib_get != ib_put) {
nv_wr32(dev, 0x003334, ib_put);
}
} else {
NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d Get 0x%08x "
"Put 0x%08x State 0x%08x Push 0x%08x\n",
chid, get, put, state, push);
if (get != put)
nv_wr32(dev, 0x003244, put);
}
nv_wr32(dev, 0x003228, 0x00000000);
nv_wr32(dev, 0x003220, 0x00000001);
nv_wr32(dev, 0x002100, NV_PFIFO_INTR_DMA_PUSHER);
status &= ~NV_PFIFO_INTR_DMA_PUSHER;
nv_wr32(dev, NV03_PFIFO_INTR_0,
NV_PFIFO_INTR_DMA_PUSHER);
nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_STATE, 0x00000000);
if (nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUT) != get)
nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_GET,
get + 4);
}
if (status & NV_PFIFO_INTR_SEMAPHORE) {