diff options
| author | Noralf Trønnes <noralf@tronnes.org> | 2018-11-10 15:56:44 +0100 |
|---|---|---|
| committer | Noralf Trønnes <noralf@tronnes.org> | 2018-11-20 14:54:53 +0100 |
| commit | 7698799f9554deeb0f3abb22857c3deb41c10db8 (patch) | |
| tree | e2c6d1d4e3342694a61d1d47651b4d69c72d8976 | |
| parent | f001488112c43fea6b7558e15f71d64ee7495286 (diff) | |
drm/prime: Add drm_gem_prime_mmap()
Add a generic PRIME GEM mmap function.
v2: Fix link in docs (Daniel Vetter)
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181110145647.17580-3-noralf@tronnes.org
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 37 | ||||
| -rw-r--r-- | include/drm/drm_prime.h | 1 |
2 files changed, 38 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index ba6c7e02a2ae..6a4fe0216e27 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -652,6 +652,43 @@ out_unlock: EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); /** + * drm_gem_prime_mmap - PRIME mmap function for GEM drivers + * @obj: GEM object + * @vma: Virtual address range + * + * This function sets up a userspace mapping for PRIME exported buffers using + * the same codepath that is used for regular GEM buffer mapping on the DRM fd. + * The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is + * called to set up the mapping. + * + * Drivers can use this as their &drm_driver.gem_prime_mmap callback. + */ +int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) +{ + /* Used by drm_gem_mmap() to lookup the GEM object */ + struct drm_file priv = { + .minor = obj->dev->primary, + }; + struct file fil = { + .private_data = &priv, + }; + int ret; + + ret = drm_vma_node_allow(&obj->vma_node, &priv); + if (ret) + return ret; + + vma->vm_pgoff += drm_vma_node_start(&obj->vma_node); + + ret = obj->dev->driver->fops->mmap(&fil, vma); + + drm_vma_node_revoke(&obj->vma_node, &priv); + + return ret; +} +EXPORT_SYMBOL(drm_gem_prime_mmap); + +/** * drm_gem_prime_import_dev - core implementation of the import callback * @dev: drm_device to import into * @dma_buf: dma-buf object to import diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h index e2032fbc0f08..b03731a3f079 100644 --- a/include/drm/drm_prime.h +++ b/include/drm/drm_prime.h @@ -70,6 +70,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev, int drm_gem_prime_handle_to_fd(struct drm_device *dev, struct drm_file *file_priv, uint32_t handle, uint32_t flags, int *prime_fd); +int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf); |