include/drm/drm_gem_cma_helper.h

   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  */
  17 struct 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 */
  64 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj);
  65
  66 /* create memory region for DRM framebuffer */
  67 int 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 */
  72 int 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 */
  77 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
  78
  79 /* allocate physical memory */
  80 struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
  81                                               size_t size);
  82
  83 extern const struct vm_operations_struct drm_gem_cma_vm_ops;
  84
  85 #ifndef CONFIG_MMU
  86 unsigned 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
  93 void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent,
  94                             const struct drm_gem_object *obj);
  95
  96 struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
  97 struct drm_gem_object *
  98 drm_gem_cma_prime_import_sg_table(struct drm_device *dev,
  99                                   struct dma_buf_attachment *attach,
 100                                   struct sg_table *sgt);
 101 int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
 102                            struct vm_area_struct *vma);
 103 void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
 104 void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 105
 106 #endif /* __DRM_GEM_CMA_HELPER_H__ */