From: Ben Skeggs <[email protected]>
The below is mainly an educated guess at what's going on, docs would
sure be handy... NVIDIA? :P
It appears it's possible for a ctxprog to run even while a GPU exception
is pending. The GF8 and up ctxprogs appear to have a small snippet of
code which detects this, and stalls the ctxprog until it's been handled,
which essentially looks like:
if (r2 & 0x00008000) {
r0 |= 0x80000000;
while (r0 & 0x80000000) {}
}
I don't know of any way that flag would get cleared unless the driver
intervenes (and indeed, in the cases I've seen the hang, nothing steps
in to automagically clear it for us). This patch causes the driver to
clear the flag during the PGRAPH IRQ handler.
Signed-off-by: Ben Skeggs <[email protected]>
drivers/gpu/drm/nouveau/nouveau_irq.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
---
http://git.linuxtv.org/v4l-dvb.git?a=commitdiff;h=7978b9cfa59133a34aaad420e447c2a29d5c6152
diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c
b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 370c72c..919a619 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -635,6 +635,7 @@ nv50_pgraph_irq_handler(struct drm_device *dev)
if ((nv_rd32(dev, 0x400500) & isb) != isb)
nv_wr32(dev, 0x400500, nv_rd32(dev, 0x400500) | isb);
+ nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) & ~(1 << 31));
}
nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PGRAPH_PENDING);
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