diff options
| author | Thomas Hellstrom <thellstrom@vmware.com> | 2014-11-20 09:56:25 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2014-11-21 12:12:41 +1000 |
| commit | 355a70183848f21198e9f6296bd646df3478a26d (patch) | |
| tree | 24d8480a3dc04ac66ed2017e62d2e644758c389c /drivers/gpu/drm/nouveau | |
| parent | cc5ac1ca79b4976ed3a779d7ea157f078207b56b (diff) | |
| download | linux-355a70183848f21198e9f6296bd646df3478a26d.tar.bz2 | |
drm/gem: Warn on illegal use of the dumb buffer interface v2
It happens on occasion that developers of generic user-space applications
abuse the dumb buffer API to get hold of drm buffers that they can both
mmap() and use for GPU acceleration, using the assumptions that dumb buffers
and buffers available for GPU are
a) The same type and can be aribtrarily type-casted.
b) fully coherent.
This patch makes the most widely used drivers warn nicely when that happens,
the next step will be to fail.
v2: Move drmP.h changes to drm_gem.h. Fix Radeon dumb mmap breakage.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_display.c | 9 | ||||
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_gem.c | 3 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c index a88e6927f571..2640fcfa5c37 100644 --- a/drivers/gpu/drm/nouveau/nouveau_display.c +++ b/drivers/gpu/drm/nouveau/nouveau_display.c @@ -871,6 +871,7 @@ nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev, if (ret) return ret; + bo->gem.dumb = true; ret = drm_gem_handle_create(file_priv, &bo->gem, &args->handle); drm_gem_object_unreference_unlocked(&bo->gem); return ret; @@ -886,6 +887,14 @@ nouveau_display_dumb_map_offset(struct drm_file *file_priv, gem = drm_gem_object_lookup(dev, file_priv, handle); if (gem) { struct nouveau_bo *bo = nouveau_gem_object(gem); + + /* + * We don't allow dumb mmaps on objects created using another + * interface. + */ + WARN_ONCE(!(gem->dumb || gem->import_attach), + "Illegal dumb map of accelerated buffer.\n"); + *poffset = drm_vma_node_offset_addr(&bo->bo.vma_node); drm_gem_object_unreference_unlocked(gem); return 0; diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c index 36951ee4b157..ebba9deb0d04 100644 --- a/drivers/gpu/drm/nouveau/nouveau_gem.c +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c @@ -444,6 +444,9 @@ validate_list(struct nouveau_channel *chan, struct nouveau_cli *cli, list_for_each_entry(nvbo, list, entry) { struct drm_nouveau_gem_pushbuf_bo *b = &pbbo[nvbo->pbbo_index]; + WARN_ONCE(nvbo->gem.dumb, + "GPU use of dumb buffer is illegal.\n"); + ret = nouveau_gem_set_domain(&nvbo->gem, b->read_domains, b->write_domains, b->valid_domains); |