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drm/nv50: avoid unloading pgraph context when ctxprog is running 

- We need to disable pgraph fifo access before checking the current channel,
  otherwise we could still hit a running ctxprog.
- The writes to 0x400500 are already handled by pgraph->fifo_access and are
  therefore redundant, moreover pgraph fifo access should not be reenabled
  before current context is set as invalid. So remove them altogether.

Signed-off-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Maarten Maathuis 2010-02-01 18:32:09 +01:00 committed by Ben Skeggs
parent eb1dba0eba
commit a51a3bf50d
2 changed files with 10 additions and 7 deletions
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7
drivers/gpu/drm/nouveau/nouveau_channel.c
View File

@ -278,12 +278,11 @@ nouveau_channel_free(struct nouveau_channel *chan)
/* Ensure the channel is no longer active on the GPU */
pfifo->reassign(dev, false);
if (pgraph->channel(dev) == chan) {
pgraph->fifo_access(dev, false);
pgraph->fifo_access(dev, false);
if (pgraph->channel(dev) == chan)
pgraph->unload_context(dev);
pgraph->fifo_access(dev, true);
}
pgraph->destroy_context(chan);
pgraph->fifo_access(dev, true);
if (pfifo->channel_id(dev) == chan->id) {
pfifo->disable(dev);

10
drivers/gpu/drm/nouveau/nv50_graph.c
View File

@ -165,6 +165,12 @@ nv50_graph_channel(struct drm_device *dev)
uint32_t inst;
int i;
/* Be sure we're not in the middle of a context switch or bad things
* will happen, such as unloading the wrong pgraph context.
*/
if (!nv_wait(0x400300, 0x00000001, 0x00000000))
NV_ERROR(dev, "Ctxprog is still running\n");
inst = nv_rd32(dev, NV50_PGRAPH_CTXCTL_CUR);
if (!(inst & NV50_PGRAPH_CTXCTL_CUR_LOADED))
return NULL;
@ -275,7 +281,7 @@ nv50_graph_load_context(struct nouveau_channel *chan)
int
nv50_graph_unload_context(struct drm_device *dev)
{
uint32_t inst, fifo = nv_rd32(dev, 0x400500);
uint32_t inst;
inst = nv_rd32(dev, NV50_PGRAPH_CTXCTL_CUR);
if (!(inst & NV50_PGRAPH_CTXCTL_CUR_LOADED))
@ -283,12 +289,10 @@ nv50_graph_unload_context(struct drm_device *dev)
inst &= NV50_PGRAPH_CTXCTL_CUR_INSTANCE;
nouveau_wait_for_idle(dev);
nv_wr32(dev, 0x400500, fifo & ~1);
nv_wr32(dev, 0x400784, inst);
nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) | 0x20);
nv_wr32(dev, 0x400304, nv_rd32(dev, 0x400304) | 0x01);
nouveau_wait_for_idle(dev);
nv_wr32(dev, 0x400500, fifo);
nv_wr32(dev, NV50_PGRAPH_CTXCTL_CUR, inst);
return 0;