LXR linux/include/drm/drm_gem_cma

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __DRM_GEM_CMA_HELPER_H__
   3#define __DRM_GEM_CMA_HELPER_H__
   4
   5#include <drm/drmP.h>
   6#include <drm/drm_gem.h>
   7
   8/**
   9 * struct drm_gem_cma_object - GEM object backed by CMA memory allocations
  10 * @base: base GEM object
  11 * @paddr: physical address of the backing memory
  12 * @sgt: scatter/gather table for imported PRIME buffers. The table can have
  13 *       more than one entry but they are guaranteed to have contiguous
  14 *       DMA addresses.
  15 * @vaddr: kernel virtual address of the backing memory
  16 */
  17struct drm_gem_cma_object {
  18        struct drm_gem_object base;
  19        dma_addr_t paddr;
  20        struct sg_table *sgt;
  21
  22        /* For objects with DMA memory allocated by GEM CMA */
  23        void *vaddr;
  24};
  25
  26#define to_drm_gem_cma_obj(gem_obj) \
  27        container_of(gem_obj, struct drm_gem_cma_object, base)
  28
  29#ifndef CONFIG_MMU
  30#define DRM_GEM_CMA_UNMAPPED_AREA_FOPS \
  31        .get_unmapped_area      = drm_gem_cma_get_unmapped_area,
  32#else
  33#define DRM_GEM_CMA_UNMAPPED_AREA_FOPS
  34#endif
  35
  36/**
  37 * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers
  38 * @name: name for the generated structure
  39 *
  40 * This macro autogenerates a suitable &struct file_operations for CMA based
  41 * drivers, which can be assigned to &drm_driver.fops. Note that this structure
  42 * cannot be shared between drivers, because it contains a reference to the
  43 * current module using THIS_MODULE.
  44 *
  45 * Note that the declaration is already marked as static - if you need a
  46 * non-static version of this you're probably doing it wrong and will break the
  47 * THIS_MODULE reference by accident.
  48 */
  49#define DEFINE_DRM_GEM_CMA_FOPS(name) \
  50        static const struct file_operations name = {\
  51                .owner          = THIS_MODULE,\
  52                .open           = drm_open,\
  53                .release        = drm_release,\
  54                .unlocked_ioctl = drm_ioctl,\
  55                .compat_ioctl   = drm_compat_ioctl,\
  56                .poll           = drm_poll,\
  57                .read           = drm_read,\
  58                .llseek         = noop_llseek,\
  59                .mmap           = drm_gem_cma_mmap,\
  60                DRM_GEM_CMA_UNMAPPED_AREA_FOPS \
  61        }
  62
  63/* free GEM object */
  64void drm_gem_cma_free_object(struct drm_gem_object *gem_obj);
  65
  66/* create memory region for DRM framebuffer */
  67int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
  68                                     struct drm_device *drm,
  69                                     struct drm_mode_create_dumb *args);
  70
  71/* create memory region for DRM framebuffer */
  72int drm_gem_cma_dumb_create(struct drm_file *file_priv,
  73                            struct drm_device *drm,
  74                            struct drm_mode_create_dumb *args);
  75
  76/* set vm_flags and we can change the VM attribute to other one at here */
  77int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
  78
  79/* allocate physical memory */
  80struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
  81                                              size_t size);
  82
  83extern const struct vm_operations_struct drm_gem_cma_vm_ops;
  84
  85#ifndef CONFIG_MMU
  86unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
  87                                            unsigned long addr,
  88                                            unsigned long len,
  89                                            unsigned long pgoff,
  90                                            unsigned long flags);
  91#endif
  92
  93void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent,
  94                            const struct drm_gem_object *obj);
  95
  96struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
  97struct drm_gem_object *
  98drm_gem_cma_prime_import_sg_table(struct drm_device *dev,
  99                                  struct dma_buf_attachment *attach,
 100                                  struct sg_table *sgt);
 101int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
 102                           struct vm_area_struct *vma);
 103void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
 104void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 105
 106#endif /* __DRM_GEM_CMA_HELPER_H__ */
 107