diff options
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 37 |
1 files changed, 37 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 |