[PATCH 1/3] Revert "drm/prime: Unexport helpers for fd/handle conversion"
Thomas Zimmermann
tzimmermann at suse.de
Mon Nov 20 11:54:40 UTC 2023
Hi
Am 17.11.23 um 22:44 schrieb Felix Kuehling:
> This reverts commit 71a7974ac7019afeec105a54447ae1dc7216cbb3.
>
> These helper functions are needed for KFD to export and import DMABufs
> the right way without duplicating the tracking of DMABufs associated with
> GEM objects while ensuring that move notifier callbacks are working as
> intended.
I'm unhappy to see these functions making a comeback. They are the
boiler-plate logic that all drivers should use. Historically, drivers
did a lot one things in their GEM code that was only semi-correct.
Unifying most of that made the memory management more readable. Not
giving back drivers to option of tinkering with this might be
preferable. The rsp hooks in struct drm_driver, prime_fd_to_handle and
prime_handle_to_fd, are only there for vmwgfx.
If you want to hook into prime import and export, there are
drm_driver.gem_prime_import and drm_gem_object_funcs.export. Isn't it
possible to move the additional code behind these pointers?
Best regards
Thomas
>
> CC: Christian König <christian.koenig at amd.com>
> CC: Thomas Zimmermann <tzimmermann at suse.de>
> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
> ---
> drivers/gpu/drm/drm_prime.c | 33 ++++++++++++++++++---------------
> include/drm/drm_prime.h | 7 +++++++
> 2 files changed, 25 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 63b709a67471..834a5e28abbe 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -278,7 +278,7 @@ void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
> }
> EXPORT_SYMBOL(drm_gem_dmabuf_release);
>
> -/*
> +/**
> * drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers
> * @dev: drm_device to import into
> * @file_priv: drm file-private structure
> @@ -292,9 +292,9 @@ EXPORT_SYMBOL(drm_gem_dmabuf_release);
> *
> * Returns 0 on success or a negative error code on failure.
> */
> -static int drm_gem_prime_fd_to_handle(struct drm_device *dev,
> - struct drm_file *file_priv, int prime_fd,
> - uint32_t *handle)
> +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 *dma_buf;
> struct drm_gem_object *obj;
> @@ -360,6 +360,7 @@ static int drm_gem_prime_fd_to_handle(struct drm_device *dev,
> dma_buf_put(dma_buf);
> return ret;
> }
> +EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
>
> int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv)
> @@ -408,7 +409,7 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
> return dmabuf;
> }
>
> -/*
> +/**
> * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers
> * @dev: dev to export the buffer from
> * @file_priv: drm file-private structure
> @@ -421,10 +422,10 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
> * The actual exporting from GEM object to a dma-buf is done through the
> * &drm_gem_object_funcs.export callback.
> */
> -static 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_handle_to_fd(struct drm_device *dev,
> + struct drm_file *file_priv, uint32_t handle,
> + uint32_t flags,
> + int *prime_fd)
> {
> struct drm_gem_object *obj;
> int ret = 0;
> @@ -506,6 +507,7 @@ static int drm_gem_prime_handle_to_fd(struct drm_device *dev,
>
> return ret;
> }
> +EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
>
> int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file_priv)
> @@ -864,9 +866,9 @@ EXPORT_SYMBOL(drm_prime_get_contiguous_size);
> * @obj: GEM object to export
> * @flags: flags like DRM_CLOEXEC and DRM_RDWR
> *
> - * This is the implementation of the &drm_gem_object_funcs.export functions
> - * for GEM drivers using the PRIME helpers. It is used as the default for
> - * drivers that do not set their own.
> + * This is the implementation of the &drm_gem_object_funcs.export functions for GEM drivers
> + * using the PRIME helpers. It is used as the default in
> + * drm_gem_prime_handle_to_fd().
> */
> struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
> int flags)
> @@ -962,9 +964,10 @@ EXPORT_SYMBOL(drm_gem_prime_import_dev);
> * @dev: drm_device to import into
> * @dma_buf: dma-buf object to import
> *
> - * This is the implementation of the gem_prime_import functions for GEM
> - * drivers using the PRIME helpers. It is the default for drivers that do
> - * not set their own &drm_driver.gem_prime_import.
> + * This is the implementation of the gem_prime_import functions for GEM drivers
> + * using the PRIME helpers. Drivers can use this as their
> + * &drm_driver.gem_prime_import implementation. It is used as the default
> + * implementation in drm_gem_prime_fd_to_handle().
> *
> * Drivers must arrange to call drm_prime_gem_destroy() from their
> * &drm_gem_object_funcs.free hook when using this function.
> diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
> index a7abf9f3e697..2a1d01e5b56b 100644
> --- a/include/drm/drm_prime.h
> +++ b/include/drm/drm_prime.h
> @@ -60,12 +60,19 @@ enum dma_data_direction;
>
> struct drm_device;
> struct drm_gem_object;
> +struct drm_file;
>
> /* core prime functions */
> struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
> struct dma_buf_export_info *exp_info);
> void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
>
> +int drm_gem_prime_fd_to_handle(struct drm_device *dev,
> + struct drm_file *file_priv, int prime_fd, uint32_t *handle);
> +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);
> +
> /* helper functions for exporting */
> int drm_gem_map_attach(struct dma_buf *dma_buf,
> struct dma_buf_attachment *attach);
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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