[PATCH 20/20] drm: Remove obsolete GEM and PRIME callbacks from struct drm_driver
Sam Ravnborg
sam at ravnborg.org
Thu Aug 13 10:16:59 UTC 2020
Hi Thomas.
On Thu, Aug 13, 2020 at 10:36:44AM +0200, Thomas Zimmermann wrote:
> Several GEM and PRIME callbacks have been deprecated in favor of
> per-instance GEM object functions. Remove the callbacks as they are
> now unused. The only exception is .gem_prime_mmap, which is still
> in use by several drivers.
>
> What is also gone is gem_vm_ops in struct drm_driver. All drivers now
> use struct drm_gem_object_funcs.vm_ops instead.
>
> While at it, the patch also improves error handling around calls
> to .free and .get_sg_table callbacks.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
After this following entry in todo.rst is done?
"
struct drm_gem_object_funcs
---------------------------
GEM objects can now have a function table instead of having the callbacks on the
DRM driver struct. This is now the preferred way and drivers can be moved over.
We also need a 2nd version of the CMA define that doesn't require the
vmapping to be present (different hook for prime importing). Plus this needs to
be rolled out to all drivers using their own implementations, too.
"
If yes, then delete it too.
Sam
> ---
> drivers/gpu/drm/drm_gem.c | 35 +++---------
> drivers/gpu/drm/drm_gem_cma_helper.c | 6 +-
> drivers/gpu/drm/drm_prime.c | 17 +++---
> include/drm/drm_drv.h | 85 ++--------------------------
> 4 files changed, 23 insertions(+), 120 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index 19d73868490e..96945bed8291 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -247,12 +247,9 @@ drm_gem_object_release_handle(int id, void *ptr, void *data)
> {
> struct drm_file *file_priv = data;
> struct drm_gem_object *obj = ptr;
> - struct drm_device *dev = obj->dev;
>
> if (obj->funcs && obj->funcs->close)
> obj->funcs->close(obj, file_priv);
> - else if (dev->driver->gem_close_object)
> - dev->driver->gem_close_object(obj, file_priv);
>
> drm_gem_remove_prime_handles(obj, file_priv);
> drm_vma_node_revoke(&obj->vma_node, file_priv);
> @@ -407,10 +404,6 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
> ret = obj->funcs->open(obj, file_priv);
> if (ret)
> goto err_revoke;
> - } else if (dev->driver->gem_open_object) {
> - ret = dev->driver->gem_open_object(obj, file_priv);
> - if (ret)
> - goto err_revoke;
> }
>
> *handlep = handle;
> @@ -982,12 +975,11 @@ drm_gem_object_free(struct kref *kref)
> {
> struct drm_gem_object *obj =
> container_of(kref, struct drm_gem_object, refcount);
> - struct drm_device *dev = obj->dev;
>
> - if (obj->funcs)
> - obj->funcs->free(obj);
> - else if (dev->driver->gem_free_object_unlocked)
> - dev->driver->gem_free_object_unlocked(obj);
> + if (drm_WARN_ON_ONCE(obj->dev, !obj->funcs || !obj->funcs->free))
> + return;
> +
> + obj->funcs->free(obj);
> }
> EXPORT_SYMBOL(drm_gem_object_free);
>
> @@ -1049,9 +1041,9 @@ EXPORT_SYMBOL(drm_gem_vm_close);
> * @obj_size: the object size to be mapped, in bytes
> * @vma: VMA for the area to be mapped
> *
> - * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops
> - * provided by the driver. Depending on their requirements, drivers can either
> - * provide a fault handler in their gem_vm_ops (in which case any accesses to
> + * Set up the VMA to prepare mapping of the GEM object using the GEM object's
> + * vm_ops. Depending on their requirements, GEM objects can either
> + * provide a fault handler in their vm_ops (in which case any accesses to
> * the object will be trapped, to perform migration, GTT binding, surface
> * register allocation, or performance monitoring), or mmap the buffer memory
> * synchronously after calling drm_gem_mmap_obj.
> @@ -1065,12 +1057,11 @@ EXPORT_SYMBOL(drm_gem_vm_close);
> * callers must verify access restrictions before calling this helper.
> *
> * Return 0 or success or -EINVAL if the object size is smaller than the VMA
> - * size, or if no gem_vm_ops are provided.
> + * size, or if no vm_ops are provided.
> */
> int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
> struct vm_area_struct *vma)
> {
> - struct drm_device *dev = obj->dev;
> int ret;
>
> /* Check for valid size. */
> @@ -1095,8 +1086,6 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
> } else {
> if (obj->funcs && obj->funcs->vm_ops)
> vma->vm_ops = obj->funcs->vm_ops;
> - else if (dev->driver->gem_vm_ops)
> - vma->vm_ops = dev->driver->gem_vm_ops;
> else {
> drm_gem_object_put(obj);
> return -EINVAL;
> @@ -1206,8 +1195,6 @@ int drm_gem_pin(struct drm_gem_object *obj)
> {
> if (obj->funcs && obj->funcs->pin)
> return obj->funcs->pin(obj);
> - else if (obj->dev->driver->gem_prime_pin)
> - return obj->dev->driver->gem_prime_pin(obj);
> else
> return 0;
> }
> @@ -1216,8 +1203,6 @@ void drm_gem_unpin(struct drm_gem_object *obj)
> {
> if (obj->funcs && obj->funcs->unpin)
> obj->funcs->unpin(obj);
> - else if (obj->dev->driver->gem_prime_unpin)
> - obj->dev->driver->gem_prime_unpin(obj);
> }
>
> void *drm_gem_vmap(struct drm_gem_object *obj)
> @@ -1226,8 +1211,6 @@ void *drm_gem_vmap(struct drm_gem_object *obj)
>
> if (obj->funcs && obj->funcs->vmap)
> vaddr = obj->funcs->vmap(obj);
> - else if (obj->dev->driver->gem_prime_vmap)
> - vaddr = obj->dev->driver->gem_prime_vmap(obj);
> else
> vaddr = ERR_PTR(-EOPNOTSUPP);
>
> @@ -1244,8 +1227,6 @@ void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr)
>
> if (obj->funcs && obj->funcs->vunmap)
> obj->funcs->vunmap(obj, vaddr);
> - else if (obj->dev->driver->gem_prime_vunmap)
> - obj->dev->driver->gem_prime_vunmap(obj, vaddr);
> }
>
> /**
> diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
> index 822edeadbab3..209202257cc2 100644
> --- a/drivers/gpu/drm/drm_gem_cma_helper.c
> +++ b/drivers/gpu/drm/drm_gem_cma_helper.c
> @@ -419,7 +419,7 @@ EXPORT_SYMBOL(drm_gem_cma_print_info);
> *
> * This function exports a scatter/gather table suitable for PRIME usage by
> * calling the standard DMA mapping API. Drivers using the CMA helpers should
> - * set this as their &drm_driver.gem_prime_get_sg_table callback.
> + * set this as their &drm_gem_object_funcs.get_sg_table callback.
> *
> * Returns:
> * A pointer to the scatter/gather table of pinned pages or NULL on failure.
> @@ -542,7 +542,7 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
> * virtual address space. Since the CMA buffers are already mapped into the
> * kernel virtual address space this simply returns the cached virtual
> * address. Drivers using the CMA helpers should set this as their DRM
> - * driver's &drm_driver.gem_prime_vmap callback.
> + * driver's &drm_gem_object_funcs.vmap callback.
> *
> * Returns:
> * The kernel virtual address of the CMA GEM object's backing store.
> @@ -564,7 +564,7 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
> * This function removes a buffer exported via DRM PRIME from the kernel's
> * virtual address space. This is a no-op because CMA buffers cannot be
> * unmapped from kernel space. Drivers using the CMA helpers should set this
> - * as their &drm_driver.gem_prime_vunmap callback.
> + * as their &drm_gem_object_funcs.vunmap callback.
> */
> void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
> {
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 1693aa7c14b5..9a87639e7008 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -386,10 +386,6 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
>
> if (obj->funcs && obj->funcs->export)
> dmabuf = obj->funcs->export(obj, flags);
> - else if (dev->driver->gem_prime_export)
> - dmabuf = dev->driver->gem_prime_export(obj, flags);
> - else
> - dmabuf = drm_gem_prime_export(obj, flags);
> if (IS_ERR(dmabuf)) {
> /* normally the created dma-buf takes ownership of the ref,
> * but if that fails then drop the ref
> @@ -419,7 +415,7 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
> * This is the PRIME export function which must be used mandatorily by GEM
> * drivers to ensure correct lifetime management of the underlying GEM object.
> * The actual exporting from GEM object to a dma-buf is done through the
> - * &drm_driver.gem_prime_export driver callback.
> + * &drm_gem_object_funcs.export callback.
> */
> int drm_gem_prime_handle_to_fd(struct drm_device *dev,
> struct drm_file *file_priv, uint32_t handle,
> @@ -616,15 +612,18 @@ struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
> enum dma_data_direction dir)
> {
> struct drm_gem_object *obj = attach->dmabuf->priv;
> - struct sg_table *sgt;
> + struct sg_table *sgt = NULL;
>
> if (WARN_ON(dir == DMA_NONE))
> return ERR_PTR(-EINVAL);
>
> - if (obj->funcs)
> + if (obj->funcs && obj->funcs->get_sg_table)
> sgt = obj->funcs->get_sg_table(obj);
> - else
> - sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
> +
> + if (!sgt)
> + return ERR_PTR(-EINVAL);
> + else if (IS_ERR(sgt))
> + return sgt;
>
> if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
> DMA_ATTR_SKIP_CPU_SYNC)) {
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index 7116abc1a04e..8b325bf6cef4 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -36,10 +36,12 @@ struct drm_file;
> struct drm_gem_object;
> struct drm_master;
> struct drm_minor;
> +struct dma_buf;
> struct dma_buf_attachment;
> struct drm_display_mode;
> struct drm_mode_create_dumb;
> struct drm_printer;
> +struct sg_table;
>
> /**
> * enum drm_driver_feature - feature flags
> @@ -327,32 +329,6 @@ struct drm_driver {
> */
> void (*debugfs_init)(struct drm_minor *minor);
>
> - /**
> - * @gem_free_object_unlocked: deconstructor for drm_gem_objects
> - *
> - * This is deprecated and should not be used by new drivers. Use
> - * &drm_gem_object_funcs.free instead.
> - */
> - void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
> -
> - /**
> - * @gem_open_object:
> - *
> - * This callback is deprecated in favour of &drm_gem_object_funcs.open.
> - *
> - * Driver hook called upon gem handle creation
> - */
> - int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
> -
> - /**
> - * @gem_close_object:
> - *
> - * This callback is deprecated in favour of &drm_gem_object_funcs.close.
> - *
> - * Driver hook called upon gem handle release
> - */
> - void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
> -
> /**
> * @gem_create_object: constructor for gem objects
> *
> @@ -361,6 +337,7 @@ struct drm_driver {
> */
> struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
> size_t size);
> +
> /**
> * @prime_handle_to_fd:
> *
> @@ -383,14 +360,7 @@ struct drm_driver {
> */
> int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
> int prime_fd, uint32_t *handle);
> - /**
> - * @gem_prime_export:
> - *
> - * Export hook for GEM drivers. Deprecated in favour of
> - * &drm_gem_object_funcs.export.
> - */
> - struct dma_buf * (*gem_prime_export)(struct drm_gem_object *obj,
> - int flags);
> +
> /**
> * @gem_prime_import:
> *
> @@ -400,29 +370,6 @@ struct drm_driver {
> */
> struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
> struct dma_buf *dma_buf);
> -
> - /**
> - * @gem_prime_pin:
> - *
> - * Deprecated hook in favour of &drm_gem_object_funcs.pin.
> - */
> - int (*gem_prime_pin)(struct drm_gem_object *obj);
> -
> - /**
> - * @gem_prime_unpin:
> - *
> - * Deprecated hook in favour of &drm_gem_object_funcs.unpin.
> - */
> - void (*gem_prime_unpin)(struct drm_gem_object *obj);
> -
> -
> - /**
> - * @gem_prime_get_sg_table:
> - *
> - * Deprecated hook in favour of &drm_gem_object_funcs.get_sg_table.
> - */
> - struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
> -
> /**
> * @gem_prime_import_sg_table:
> *
> @@ -433,22 +380,6 @@ struct drm_driver {
> struct drm_device *dev,
> struct dma_buf_attachment *attach,
> struct sg_table *sgt);
> - /**
> - * @gem_prime_vmap:
> - *
> - * Deprecated vmap hook for GEM drivers. Please use
> - * &drm_gem_object_funcs.vmap instead.
> - */
> - void *(*gem_prime_vmap)(struct drm_gem_object *obj);
> -
> - /**
> - * @gem_prime_vunmap:
> - *
> - * Deprecated vunmap hook for GEM drivers. Please use
> - * &drm_gem_object_funcs.vunmap instead.
> - */
> - void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
> -
> /**
> * @gem_prime_mmap:
> *
> @@ -523,14 +454,6 @@ struct drm_driver {
> struct drm_device *dev,
> uint32_t handle);
>
> - /**
> - * @gem_vm_ops: Driver private ops for this object
> - *
> - * For GEM drivers this is deprecated in favour of
> - * &drm_gem_object_funcs.vm_ops.
> - */
> - const struct vm_operations_struct *gem_vm_ops;
> -
> /** @major: driver major number */
> int major;
> /** @minor: driver minor number */
> --
> 2.28.0
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