diff options
author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-10-05 12:21:44 (GMT) |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-10-05 13:30:32 (GMT) |
commit | a4fce9cb782ad340ee5576a38e934e5e75832dc6 (patch) | |
tree | 528aa09d8be2f3fcbe72e3a8b972fc6e6711a68d | |
parent | 56a76c0123d6cb034975901c80fce2627338ef9e (diff) | |
download | linux-a4fce9cb782ad340ee5576a38e934e5e75832dc6.tar.xz |
drm/prime: Take a ref on the drm_dev when exporting a dma_buf
dma_buf may live a long time, longer than the last direct user of the
driver. We already hold a reference to the owner module (that prevents
the object code from disappearing), but there is no reference to the
drm_dev - so the pointers to the driver backend themselves may vanish.
v2: Resist temptation to fix the bug in armada_gem.c not setting the
correct flags on the exported dma-buf (it should pass the flags through
and not be arbitrarily setting O_RDWR).
Use a common wrapper for exporting the dmabuf and acquiring the
reference to the drm_device.
Testcase: igt/vgem_basic/unload
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Tested-by: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161005122145.1507-2-chris@chris-wilson.co.uk
-rw-r--r-- | drivers/gpu/drm/armada/armada_gem.c | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/drm_prime.c | 30 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/i915_gem_dmabuf.c | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/tegra/gem.c | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/udl/udl_dmabuf.c | 2 | ||||
-rw-r--r-- | include/drm/drmP.h | 4 |
6 files changed, 37 insertions, 5 deletions
diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c index cb8f034..a5e428d 100644 --- a/drivers/gpu/drm/armada/armada_gem.c +++ b/drivers/gpu/drm/armada/armada_gem.c @@ -547,7 +547,7 @@ armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, exp_info.flags = O_RDWR; exp_info.priv = obj; - return dma_buf_export(&exp_info); + return drm_gem_dmabuf_export(dev, &exp_info); } struct drm_gem_object * diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 80907b3..875df8d 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -284,18 +284,46 @@ static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, } /** + * drm_gem_dmabuf_export - dma_buf export implementation for GEM + * @dma_buf: buffer to be exported + * + * This wraps dma_buf_export() for use by generic GEM drivers that are using + * drm_gem_dmabuf_release(). In addition to calling dma_buf_export(), we take + * a reference to the drm_device which is released by drm_gem_dmabuf_release(). + * + * Returns the new dmabuf. + */ +struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev, + struct dma_buf_export_info *exp_info) +{ + struct dma_buf *dma_buf; + + dma_buf = dma_buf_export(exp_info); + if (!IS_ERR(dma_buf)) + drm_dev_ref(dev); + + return dma_buf; +} +EXPORT_SYMBOL(drm_gem_dmabuf_export); + +/** * drm_gem_dmabuf_release - dma_buf release implementation for GEM * @dma_buf: buffer to be released * * Generic release function for dma_bufs exported as PRIME buffers. GEM drivers * must use this in their dma_buf ops structure as the release callback. + * drm_gem_dmabuf_release() should be used in conjunction with + * drm_gem_dmabuf_export(). */ void drm_gem_dmabuf_release(struct dma_buf *dma_buf) { struct drm_gem_object *obj = dma_buf->priv; + struct drm_device *dev = obj->dev; /* drop the reference on the export fd holds */ drm_gem_object_unreference_unlocked(obj); + + drm_dev_unref(dev); } EXPORT_SYMBOL(drm_gem_dmabuf_release); @@ -412,7 +440,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev, if (dev->driver->gem_prime_res_obj) exp_info.resv = dev->driver->gem_prime_res_obj(obj); - return dma_buf_export(&exp_info); + return drm_gem_dmabuf_export(dev, &exp_info); } EXPORT_SYMBOL(drm_gem_prime_export); diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 10265bb..97c9d68 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -283,7 +283,7 @@ struct dma_buf *i915_gem_prime_export(struct drm_device *dev, return ERR_PTR(ret); } - dma_buf = dma_buf_export(&exp_info); + dma_buf = drm_gem_dmabuf_export(dev, &exp_info); if (IS_ERR(dma_buf)) return dma_buf; diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index aa60d99..95e622e 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -613,7 +613,7 @@ struct dma_buf *tegra_gem_prime_export(struct drm_device *drm, exp_info.flags = flags; exp_info.priv = gem; - return dma_buf_export(&exp_info); + return drm_gem_dmabuf_export(drm, &exp_info); } struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, diff --git a/drivers/gpu/drm/udl/udl_dmabuf.c b/drivers/gpu/drm/udl/udl_dmabuf.c index e2243ed..ac90ffd 100644 --- a/drivers/gpu/drm/udl/udl_dmabuf.c +++ b/drivers/gpu/drm/udl/udl_dmabuf.c @@ -209,7 +209,7 @@ struct dma_buf *udl_gem_prime_export(struct drm_device *dev, exp_info.flags = flags; exp_info.priv = obj; - return dma_buf_export(&exp_info); + return drm_gem_dmabuf_export(dev, &exp_info); } static int udl_prime_create(struct drm_device *dev, diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 81fcd55..6726440 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1011,6 +1011,8 @@ static inline int drm_debugfs_remove_files(const struct drm_info_list *files, } #endif +struct dma_buf_export_info; + extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags); @@ -1021,6 +1023,8 @@ extern struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf); extern int drm_gem_prime_fd_to_handle(struct drm_device *dev, struct drm_file *file_priv, int prime_fd, uint32_t *handle); +struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev, + struct dma_buf_export_info *exp_info); extern void drm_gem_dmabuf_release(struct dma_buf *dma_buf); extern int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, |