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/drm_file.h>
   6 #include <drm/drm_ioctl.h>
   7 #include <drm/drm_gem.h>
   8
   9 struct drm_mode_create_dumb;
  10
  11 /**
  12  * struct drm_gem_cma_object - GEM object backed by CMA memory allocations
  13  * @base: base GEM object
  14  * @paddr: physical address of the backing memory
  15  * @sgt: scatter/gather table for imported PRIME buffers. The table can have
  16  *       more than one entry but they are guaranteed to have contiguous
  17  *       DMA addresses.
  18  * @vaddr: kernel virtual address of the backing memory
  19  */
  20 struct drm_gem_cma_object {
  21         struct drm_gem_object base;
  22         dma_addr_t paddr;
  23         struct sg_table *sgt;
  24
  25         /* For objects with DMA memory allocated by GEM CMA */
  26         void *vaddr;
  27 };
  28
  29 #define to_drm_gem_cma_obj(gem_obj) \
  30         container_of(gem_obj, struct drm_gem_cma_object, base)
  31
  32 #ifndef CONFIG_MMU
  33 #define DRM_GEM_CMA_UNMAPPED_AREA_FOPS \
  34         .get_unmapped_area      = drm_gem_cma_get_unmapped_area,
  35 #else
  36 #define DRM_GEM_CMA_UNMAPPED_AREA_FOPS
  37 #endif
  38
  39 /**
  40  * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers
  41  * @name: name for the generated structure
  42  *
  43  * This macro autogenerates a suitable &struct file_operations for CMA based
  44  * drivers, which can be assigned to &drm_driver.fops. Note that this structure
  45  * cannot be shared between drivers, because it contains a reference to the
  46  * current module using THIS_MODULE.
  47  *
  48  * Note that the declaration is already marked as static - if you need a
  49  * non-static version of this you're probably doing it wrong and will break the
  50  * THIS_MODULE reference by accident.
  51  */
  52 #define DEFINE_DRM_GEM_CMA_FOPS(name) \
  53         static const struct file_operations name = {\
  54                 .owner          = THIS_MODULE,\
  55                 .open           = drm_open,\
  56                 .release        = drm_release,\
  57                 .unlocked_ioctl = drm_ioctl,\
  58                 .compat_ioctl   = drm_compat_ioctl,\
  59                 .poll           = drm_poll,\
  60                 .read           = drm_read,\
  61                 .llseek         = noop_llseek,\
  62                 .mmap           = drm_gem_cma_mmap,\
  63                 DRM_GEM_CMA_UNMAPPED_AREA_FOPS \
  64         }
  65
  66 /* free GEM object */
  67 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj);
  68
  69 /* create memory region for DRM framebuffer */
  70 int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
  71                                      struct drm_device *drm,
  72                                      struct drm_mode_create_dumb *args);
  73
  74 /* create memory region for DRM framebuffer */
  75 int drm_gem_cma_dumb_create(struct drm_file *file_priv,
  76                             struct drm_device *drm,
  77                             struct drm_mode_create_dumb *args);
  78
  79 /* set vm_flags and we can change the VM attribute to other one at here */
  80 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
  81
  82 /* allocate physical memory */
  83 struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
  84                                               size_t size);
  85
  86 extern const struct vm_operations_struct drm_gem_cma_vm_ops;
  87
  88 #ifndef CONFIG_MMU
  89 unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
  90                                             unsigned long addr,
  91                                             unsigned long len,
  92                                             unsigned long pgoff,
  93                                             unsigned long flags);
  94 #endif
  95
  96 void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent,
  97                             const struct drm_gem_object *obj);
  98
  99 struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
 100 struct drm_gem_object *
 101 drm_gem_cma_prime_import_sg_table(struct drm_device *dev,
 102                                   struct dma_buf_attachment *attach,
 103                                   struct sg_table *sgt);
 104 int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
 105                            struct vm_area_struct *vma);
 106 void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
 107 void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 108
 109 struct drm_gem_object *
 110 drm_cma_gem_create_object_default_funcs(struct drm_device *dev, size_t size);
 111
 112 /**
 113  * DRM_GEM_CMA_VMAP_DRIVER_OPS - CMA GEM driver operations ensuring a virtual
 114  *                               address on the buffer
 115  *
 116  * This macro provides a shortcut for setting the default GEM operations in the
 117  * &drm_driver structure for drivers that need the virtual address also on
 118  * imported buffers.
 119  */
 120 #define DRM_GEM_CMA_VMAP_DRIVER_OPS \
 121         .gem_create_object      = drm_cma_gem_create_object_default_funcs, \
 122         .dumb_create            = drm_gem_cma_dumb_create, \
 123         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd, \
 124         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle, \
 125         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap, \
 126         .gem_prime_mmap         = drm_gem_prime_mmap
 127
 128 struct drm_gem_object *
 129 drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *drm,
 130                                        struct dma_buf_attachment *attach,
 131                                        struct sg_table *sgt);
 132
 133 #endif /* __DRM_GEM_CMA_HELPER_H__ */