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drm/nouveau: fix race condition when under memory pressure

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When VRAM is running out it's possible that the client's push buffers get
evicted to main memory.  When they're validated back in, the GPU may
be used for the copy back to VRAM, but the existing synchronisation code
only deals with inter-channel sync, not sync between PFIFO and PGRAPH on
the same channel.  This leads to PFIFO fetching from command buffers that
haven't quite been copied by PGRAPH yet.

This patch marks push buffers as so, and forces any GPU-assisted buffer
moves to be done on a different channel, which triggers the correct
synchronisation to happen before we submit them.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-07-23 09:06:52 +10:00
parent 56dfc58ea0
commit 415e6186f1
3 changed files with 42 additions and 10 deletions
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15
drivers/gpu/drm/nouveau/nouveau_bo.c
View File

@ -36,6 +36,21 @@
#include <linux/log2.h>
#include <linux/slab.h>
int
nouveau_bo_sync_gpu(struct nouveau_bo *nvbo, struct nouveau_channel *chan)
{
struct nouveau_fence *prev_fence = nvbo->bo.sync_obj;
int ret;
if (!prev_fence || nouveau_fence_channel(prev_fence) == chan)
return 0;
spin_lock(&nvbo->bo.lock);
ret = ttm_bo_wait(&nvbo->bo, false, false, false);
spin_unlock(&nvbo->bo.lock);
return ret;
}
static void
nouveau_bo_del_ttm(struct ttm_buffer_object *bo)
{

1
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -1165,6 +1165,7 @@ extern u16 nouveau_bo_rd16(struct nouveau_bo *nvbo, unsigned index);
extern void nouveau_bo_wr16(struct nouveau_bo *nvbo, unsigned index, u16 val);
extern u32 nouveau_bo_rd32(struct nouveau_bo *nvbo, unsigned index);
extern void nouveau_bo_wr32(struct nouveau_bo *nvbo, unsigned index, u32 val);
extern int nouveau_bo_sync_gpu(struct nouveau_bo *, struct nouveau_channel *);
/* nouveau_fence.c */
struct nouveau_fence;

36
drivers/gpu/drm/nouveau/nouveau_gem.c
View File

@ -361,16 +361,11 @@ validate_list(struct nouveau_channel *chan, struct list_head *list,
list_for_each_entry(nvbo, list, entry) {
struct drm_nouveau_gem_pushbuf_bo *b = &pbbo[nvbo->pbbo_index];
struct nouveau_fence *prev_fence = nvbo->bo.sync_obj;
if (prev_fence && nouveau_fence_channel(prev_fence) != chan) {
spin_lock(&nvbo->bo.lock);
ret = ttm_bo_wait(&nvbo->bo, false, false, false);
spin_unlock(&nvbo->bo.lock);
if (unlikely(ret)) {
NV_ERROR(dev, "fail wait other chan\n");
return ret;
}
ret = nouveau_bo_sync_gpu(nvbo, chan);
if (unlikely(ret)) {
NV_ERROR(dev, "fail pre-validate sync\n");
return ret;
}
ret = nouveau_gem_set_domain(nvbo->gem, b->read_domains,
@ -381,7 +376,7 @@ validate_list(struct nouveau_channel *chan, struct list_head *list,
return ret;
}
nvbo->channel = chan;
nvbo->channel = (b->read_domains & (1 << 31)) ? NULL : chan;
ret = ttm_bo_validate(&nvbo->bo, &nvbo->placement,
false, false, false);
nvbo->channel = NULL;
@ -390,6 +385,12 @@ validate_list(struct nouveau_channel *chan, struct list_head *list,
return ret;
}
ret = nouveau_bo_sync_gpu(nvbo, chan);
if (unlikely(ret)) {
NV_ERROR(dev, "fail post-validate sync\n");
return ret;
}
if (nvbo->bo.offset == b->presumed.offset &&
((nvbo->bo.mem.mem_type == TTM_PL_VRAM &&
b->presumed.domain & NOUVEAU_GEM_DOMAIN_VRAM) ||
@ -615,6 +616,21 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
mutex_lock(&dev->struct_mutex);
/* Mark push buffers as being used on PFIFO, the validation code
* will then make sure that if the pushbuf bo moves, that they
* happen on the kernel channel, which will in turn cause a sync
* to happen before we try and submit the push buffer.
*/
for (i = 0; i < req->nr_push; i++) {
if (push[i].bo_index >= req->nr_buffers) {
NV_ERROR(dev, "push %d buffer not in list\n", i);
ret = -EINVAL;
goto out;
}
bo[push[i].bo_index].read_domains |= (1 << 31);
}
/* Validate buffer list */
ret = nouveau_gem_pushbuf_validate(chan, file_priv, bo, req->buffers,
req->nr_buffers, &op, &do_reloc);