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drm/nouveau: remove cpu_writers lock

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No other driver uses this, and userspace should be responsible for handling
locking between them if they share BOs.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-10-11 11:48:45 +10:00
parent b12120a58e
commit 21e86c1c8a
3 changed files with 4 additions and 62 deletions
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1
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -96,7 +96,6 @@ struct nouveau_bo {
struct nouveau_tile_reg *tile;
struct drm_gem_object *gem;
struct drm_file *cpu_filp;
int pin_refcnt;
};

64
drivers/gpu/drm/nouveau/nouveau_gem.c
View File

@ -48,9 +48,6 @@ nouveau_gem_object_del(struct drm_gem_object *gem)
return;
nvbo->gem = NULL;
if (unlikely(nvbo->cpu_filp))
ttm_bo_synccpu_write_release(bo);
if (unlikely(nvbo->pin_refcnt)) {
nvbo->pin_refcnt = 1;
nouveau_bo_unpin(nvbo);
@ -334,23 +331,6 @@ retry:
validate_fini(op, NULL);
return -EINVAL;
}
if (unlikely(atomic_read(&nvbo->bo.cpu_writers) > 0)) {
validate_fini(op, NULL);
if (nvbo->cpu_filp == file_priv) {
NV_ERROR(dev, "bo %p mapped by process trying "
"to validate it!\n", nvbo);
return -EINVAL;
}
ret = ttm_bo_wait_cpu(&nvbo->bo, false);
if (ret) {
NV_ERROR(dev, "fail wait_cpu\n");
return ret;
}
goto retry;
}
}
return 0;
@ -791,26 +771,9 @@ nouveau_gem_ioctl_cpu_prep(struct drm_device *dev, void *data,
return -ENOENT;
nvbo = nouveau_gem_object(gem);
if (nvbo->cpu_filp) {
if (nvbo->cpu_filp == file_priv)
goto out;
ret = ttm_bo_wait_cpu(&nvbo->bo, no_wait);
if (ret)
goto out;
}
if (req->flags & NOUVEAU_GEM_CPU_PREP_NOBLOCK) {
spin_lock(&nvbo->bo.bdev->fence_lock);
ret = ttm_bo_wait(&nvbo->bo, false, false, no_wait);
spin_unlock(&nvbo->bo.bdev->fence_lock);
} else {
ret = ttm_bo_synccpu_write_grab(&nvbo->bo, no_wait);
if (ret == 0)
nvbo->cpu_filp = file_priv;
}
out:
spin_lock(&nvbo->bo.bdev->fence_lock);
ret = ttm_bo_wait(&nvbo->bo, true, true, no_wait);
spin_unlock(&nvbo->bo.bdev->fence_lock);
drm_gem_object_unreference_unlocked(gem);
return ret;
}
@ -819,26 +782,7 @@ int
nouveau_gem_ioctl_cpu_fini(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_nouveau_gem_cpu_prep *req = data;
struct drm_gem_object *gem;
struct nouveau_bo *nvbo;
int ret = -EINVAL;
gem = drm_gem_object_lookup(dev, file_priv, req->handle);
if (!gem)
return -ENOENT;
nvbo = nouveau_gem_object(gem);
if (nvbo->cpu_filp != file_priv)
goto out;
nvbo->cpu_filp = NULL;
ttm_bo_synccpu_write_release(&nvbo->bo);
ret = 0;
out:
drm_gem_object_unreference_unlocked(gem);
return ret;
return 0;
}
int

1
include/drm/nouveau_drm.h
View File

@ -171,7 +171,6 @@ struct drm_nouveau_gem_pushbuf {
};
#define NOUVEAU_GEM_CPU_PREP_NOWAIT 0x00000001
#define NOUVEAU_GEM_CPU_PREP_NOBLOCK 0x00000002
#define NOUVEAU_GEM_CPU_PREP_WRITE 0x00000004
struct drm_nouveau_gem_cpu_prep {
uint32_t handle;