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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __DRM_GEM_DMA_HELPER_H__
#define __DRM_GEM_DMA_HELPER_H__
#include <drm/drm_file.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_gem.h>
struct drm_mode_create_dumb;
/**
* struct drm_gem_dma_object - GEM object backed by DMA memory allocations
* @base: base GEM object
* @dma_addr: DMA address of the backing memory
* @sgt: scatter/gather table for imported PRIME buffers. The table can have
* more than one entry but they are guaranteed to have contiguous
* DMA addresses.
* @vaddr: kernel virtual address of the backing memory
* @map_noncoherent: if true, the GEM object is backed by non-coherent memory
*/
struct drm_gem_dma_object {
struct drm_gem_object base;
dma_addr_t dma_addr;
struct sg_table *sgt;
/* For objects with DMA memory allocated by GEM DMA */
void *vaddr;
bool map_noncoherent;
};
#define to_drm_gem_dma_obj(gem_obj) \
container_of(gem_obj, struct drm_gem_dma_object, base)
struct drm_gem_dma_object *drm_gem_dma_create(struct drm_device *drm,
size_t size);
void drm_gem_dma_free(struct drm_gem_dma_object *dma_obj);
void drm_gem_dma_print_info(const struct drm_gem_dma_object *dma_obj,
struct drm_printer *p, unsigned int indent);
struct sg_table *drm_gem_dma_get_sg_table(struct drm_gem_dma_object *dma_obj);
int drm_gem_dma_vmap(struct drm_gem_dma_object *dma_obj,
struct iosys_map *map);
int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *vma);
extern const struct vm_operations_struct drm_gem_dma_vm_ops;
/*
* GEM object functions
*/
/**
* drm_gem_dma_object_free - GEM object function for drm_gem_dma_free()
* @obj: GEM object to free
*
* This function wraps drm_gem_dma_free_object(). Drivers that employ the DMA helpers
* should use it as their &drm_gem_object_funcs.free handler.
*/
static inline void drm_gem_dma_object_free(struct drm_gem_object *obj)
{
struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
drm_gem_dma_free(dma_obj);
}
/**
* drm_gem_dma_object_print_info() - Print &drm_gem_dma_object info for debugfs
* @p: DRM printer
* @indent: Tab indentation level
* @obj: GEM object
*
* This function wraps drm_gem_dma_print_info(). Drivers that employ the DMA helpers
* should use this function as their &drm_gem_object_funcs.print_info handler.
*/
static inline void drm_gem_dma_object_print_info(struct drm_printer *p, unsigned int indent,
const struct drm_gem_object *obj)
{
const struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
drm_gem_dma_print_info(dma_obj, p, indent);
}
/**
* drm_gem_dma_object_get_sg_table - GEM object function for drm_gem_dma_get_sg_table()
* @obj: GEM object
*
* This function wraps drm_gem_dma_get_sg_table(). Drivers that employ the DMA helpers should
* use it as their &drm_gem_object_funcs.get_sg_table handler.
*
* Returns:
* A pointer to the scatter/gather table of pinned pages or NULL on failure.
*/
static inline struct sg_table *drm_gem_dma_object_get_sg_table(struct drm_gem_object *obj)
{
struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
return drm_gem_dma_get_sg_table(dma_obj);
}
/*
* drm_gem_dma_object_vmap - GEM object function for drm_gem_dma_vmap()
* @obj: GEM object
* @map: Returns the kernel virtual address of the DMA GEM object's backing store.
*
* This function wraps drm_gem_dma_vmap(). Drivers that employ the DMA helpers should
* use it as their &drm_gem_object_funcs.vmap handler.
*
* Returns:
* 0 on success or a negative error code on failure.
*/
static inline int drm_gem_dma_object_vmap(struct drm_gem_object *obj,
struct iosys_map *map)
{
struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
return drm_gem_dma_vmap(dma_obj, map);
}
/**
* drm_gem_dma_object_mmap - GEM object function for drm_gem_dma_mmap()
* @obj: GEM object
* @vma: VMA for the area to be mapped
*
* This function wraps drm_gem_dma_mmap(). Drivers that employ the dma helpers should
* use it as their &drm_gem_object_funcs.mmap handler.
*
* Returns:
* 0 on success or a negative error code on failure.
*/
static inline int drm_gem_dma_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
return drm_gem_dma_mmap(dma_obj, vma);
}
/*
* Driver ops
*/
/* create memory region for DRM framebuffer */
int drm_gem_dma_dumb_create_internal(struct drm_file *file_priv,
struct drm_device *drm,
struct drm_mode_create_dumb *args);
/* create memory region for DRM framebuffer */
int drm_gem_dma_dumb_create(struct drm_file *file_priv,
struct drm_device *drm,
struct drm_mode_create_dumb *args);
struct drm_gem_object *
drm_gem_dma_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt);
/**
* DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE - DMA GEM driver operations
* @dumb_create_func: callback function for .dumb_create
*
* This macro provides a shortcut for setting the default GEM operations in the
* &drm_driver structure.
*
* This macro is a variant of DRM_GEM_DMA_DRIVER_OPS for drivers that
* override the default implementation of &struct rm_driver.dumb_create. Use
* DRM_GEM_DMA_DRIVER_OPS if possible. Drivers that require a virtual address
* on imported buffers should use
* DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead.
*/
#define DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(dumb_create_func) \
.dumb_create = (dumb_create_func), \
.gem_prime_import_sg_table = drm_gem_dma_prime_import_sg_table
/**
* DRM_GEM_DMA_DRIVER_OPS - DMA GEM driver operations
*
* This macro provides a shortcut for setting the default GEM operations in the
* &drm_driver structure.
*
* Drivers that come with their own implementation of
* &struct drm_driver.dumb_create should use
* DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() instead. Use
* DRM_GEM_DMA_DRIVER_OPS if possible. Drivers that require a virtual address
* on imported buffers should use DRM_GEM_DMA_DRIVER_OPS_VMAP instead.
*/
#define DRM_GEM_DMA_DRIVER_OPS \
DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_gem_dma_dumb_create)
/**
* DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE - DMA GEM driver operations
* ensuring a virtual address
* on the buffer
* @dumb_create_func: callback function for .dumb_create
*
* This macro provides a shortcut for setting the default GEM operations in the
* &drm_driver structure for drivers that need the virtual address also on
* imported buffers.
*
* This macro is a variant of DRM_GEM_DMA_DRIVER_OPS_VMAP for drivers that
* override the default implementation of &struct drm_driver.dumb_create. Use
* DRM_GEM_DMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a
* virtual address on imported buffers should use
* DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() instead.
*/
#define DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(dumb_create_func) \
.dumb_create = (dumb_create_func), \
.gem_prime_import_sg_table = drm_gem_dma_prime_import_sg_table_vmap
/**
* DRM_GEM_DMA_DRIVER_OPS_VMAP - DMA GEM driver operations ensuring a virtual
* address on the buffer
*
* This macro provides a shortcut for setting the default GEM operations in the
* &drm_driver structure for drivers that need the virtual address also on
* imported buffers.
*
* Drivers that come with their own implementation of
* &struct drm_driver.dumb_create should use
* DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead. Use
* DRM_GEM_DMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a
* virtual address on imported buffers should use DRM_GEM_DMA_DRIVER_OPS
* instead.
*/
#define DRM_GEM_DMA_DRIVER_OPS_VMAP \
DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(drm_gem_dma_dumb_create)
struct drm_gem_object *
drm_gem_dma_prime_import_sg_table_vmap(struct drm_device *drm,
struct dma_buf_attachment *attach,
struct sg_table *sgt);
/*
* File ops
*/
#ifndef CONFIG_MMU
unsigned long drm_gem_dma_get_unmapped_area(struct file *filp,
unsigned long addr,
unsigned long len,
unsigned long pgoff,
unsigned long flags);
#define DRM_GEM_DMA_UNMAPPED_AREA_FOPS \
.get_unmapped_area = drm_gem_dma_get_unmapped_area,
#else
#define DRM_GEM_DMA_UNMAPPED_AREA_FOPS
#endif
/**
* DEFINE_DRM_GEM_DMA_FOPS() - macro to generate file operations for DMA drivers
* @name: name for the generated structure
*
* This macro autogenerates a suitable &struct file_operations for DMA based
* drivers, which can be assigned to &drm_driver.fops. Note that this structure
* cannot be shared between drivers, because it contains a reference to the
* current module using THIS_MODULE.
*
* Note that the declaration is already marked as static - if you need a
* non-static version of this you're probably doing it wrong and will break the
* THIS_MODULE reference by accident.
*/
#define DEFINE_DRM_GEM_DMA_FOPS(name) \
static const struct file_operations name = {\
.owner = THIS_MODULE,\
.open = drm_open,\
.release = drm_release,\
.unlocked_ioctl = drm_ioctl,\
.compat_ioctl = drm_compat_ioctl,\
.poll = drm_poll,\
.read = drm_read,\
.llseek = noop_llseek,\
.mmap = drm_gem_mmap,\
DRM_GEM_DMA_UNMAPPED_AREA_FOPS \
}
#endif /* __DRM_GEM_DMA_HELPER_H__ */