From 7698799f9554deeb0f3abb22857c3deb41c10db8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= Date: Sat, 10 Nov 2018 15:56:44 +0100 Subject: [PATCH] drm/prime: Add drm_gem_prime_mmap() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a generic PRIME GEM mmap function. v2: Fix link in docs (Daniel Vetter) Suggested-by: Daniel Vetter Signed-off-by: Noralf Trønnes Reviewed-by: Daniel Vetter Acked-by: Christian König Link: https://patchwork.freedesktop.org/patch/msgid/20181110145647.17580-3-noralf@tronnes.org --- drivers/gpu/drm/drm_prime.c | 37 +++++++++++++++++++++++++++++++++++++ include/drm/drm_prime.h | 1 + 2 files changed, 38 insertions(+) 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 @@ -651,6 +651,43 @@ 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 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);