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Diffstat (limited to '')
| -rw-r--r-- | include/drm/drm_gem_cma_helper.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h new file mode 100644 index 000000000..2bfa25026 --- /dev/null +++ b/include/drm/drm_gem_cma_helper.h @@ -0,0 +1,195 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __DRM_GEM_CMA_HELPER_H__ +#define __DRM_GEM_CMA_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_cma_object - GEM object backed by CMA memory allocations + * @base: base GEM object + * @paddr: physical 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 + */ +struct drm_gem_cma_object { + struct drm_gem_object base; + dma_addr_t paddr; + struct sg_table *sgt; + + /* For objects with DMA memory allocated by GEM CMA */ + void *vaddr; +}; + +#define to_drm_gem_cma_obj(gem_obj) \ + container_of(gem_obj, struct drm_gem_cma_object, base) + +#ifndef CONFIG_MMU +#define DRM_GEM_CMA_UNMAPPED_AREA_FOPS \ + .get_unmapped_area = drm_gem_cma_get_unmapped_area, +#else +#define DRM_GEM_CMA_UNMAPPED_AREA_FOPS +#endif + +/** + * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers + * @name: name for the generated structure + * + * This macro autogenerates a suitable &struct file_operations for CMA 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_CMA_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_cma_mmap,\ + DRM_GEM_CMA_UNMAPPED_AREA_FOPS \ + } + +/* free GEM object */ +void drm_gem_cma_free_object(struct drm_gem_object *gem_obj); + +/* create memory region for DRM framebuffer */ +int drm_gem_cma_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_cma_dumb_create(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args); + +/* set vm_flags and we can change the VM attribute to other one at here */ +int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma); + +/* allocate physical memory */ +struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, + size_t size); + +extern const struct vm_operations_struct drm_gem_cma_vm_ops; + +#ifndef CONFIG_MMU +unsigned long drm_gem_cma_get_unmapped_area(struct file *filp, + unsigned long addr, + unsigned long len, + unsigned long pgoff, + unsigned long flags); +#endif + +void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent, + const struct drm_gem_object *obj); + +struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj); +struct drm_gem_object * +drm_gem_cma_prime_import_sg_table(struct drm_device *dev, + struct dma_buf_attachment *attach, + struct sg_table *sgt); +int drm_gem_cma_prime_mmap(struct drm_gem_object *obj, + struct vm_area_struct *vma); +void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj); +void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr); + +struct drm_gem_object * +drm_gem_cma_create_object_default_funcs(struct drm_device *dev, size_t size); + +/** + * DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE - CMA 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_CMA_DRIVER_OPS for drivers that + * override the default implementation of &struct rm_driver.dumb_create. Use + * DRM_GEM_CMA_DRIVER_OPS if possible. Drivers that require a virtual address + * on imported buffers should use + * DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead. + */ +#define DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(dumb_create_func) \ + .gem_create_object = drm_gem_cma_create_object_default_funcs, \ + .dumb_create = (dumb_create_func), \ + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \ + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \ + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, \ + .gem_prime_mmap = drm_gem_cma_prime_mmap + +/** + * DRM_GEM_CMA_DRIVER_OPS - CMA 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_CMA_DRIVER_OPS_WITH_DUMB_CREATE() instead. Use + * DRM_GEM_CMA_DRIVER_OPS if possible. Drivers that require a virtual address + * on imported buffers should use DRM_GEM_CMA_DRIVER_OPS_VMAP instead. + */ +#define DRM_GEM_CMA_DRIVER_OPS \ + DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_gem_cma_dumb_create) + +/** + * DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE - CMA 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_CMA_DRIVER_OPS_VMAP for drivers that + * override the default implementation of &struct drm_driver.dumb_create. Use + * DRM_GEM_CMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a + * virtual address on imported buffers should use + * DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE() instead. + */ +#define DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(dumb_create_func) \ + .gem_create_object = drm_gem_cma_create_object_default_funcs, \ + .dumb_create = dumb_create_func, \ + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \ + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \ + .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap, \ + .gem_prime_mmap = drm_gem_prime_mmap + +/** + * DRM_GEM_CMA_DRIVER_OPS_VMAP - CMA 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_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead. Use + * DRM_GEM_CMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a + * virtual address on imported buffers should use DRM_GEM_CMA_DRIVER_OPS + * instead. + */ +#define DRM_GEM_CMA_DRIVER_OPS_VMAP \ + DRM_GEM_CMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(drm_gem_cma_dumb_create) + +struct drm_gem_object * +drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *drm, + struct dma_buf_attachment *attach, + struct sg_table *sgt); + +#endif /* __DRM_GEM_CMA_HELPER_H__ */ |