include/drm/drm_gem_cma_helper.h

   1 #ifndef __DRM_GEM_CMA_HELPER_H__
   2 #define __DRM_GEM_CMA_HELPER_H__
   3
   4 #include <drm/drmP.h>
   5 #include <drm/drm_gem.h>
   6
   7 /**
   8  * struct drm_gem_cma_object - GEM object backed by CMA memory allocations
   9  * @base: base GEM object
  10  * @paddr: physical address of the backing memory
  11  * @sgt: scatter/gather table for imported PRIME buffers
  12  * @vaddr: kernel virtual address of the backing memory
  13  */
  14 struct drm_gem_cma_object {
  15         struct drm_gem_object base;
  16         dma_addr_t paddr;
  17         struct sg_table *sgt;
  18
  19         /* For objects with DMA memory allocated by GEM CMA */
  20         void *vaddr;
  21 };
  22
  23 static inline struct drm_gem_cma_object *
  24 to_drm_gem_cma_obj(struct drm_gem_object *gem_obj)
  25 {
  26         return container_of(gem_obj, struct drm_gem_cma_object, base);
  27 }
  28
  29 /**
  30  * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers
  31  * @name: name for the generated structure
  32  *
  33  * This macro autogenerates a suitable &struct file_operations for CMA based
  34  * drivers, which can be assigned to &drm_driver.fops. Note that this structure
  35  * cannot be shared between drivers, because it contains a reference to the
  36  * current module using THIS_MODULE.
  37  *
  38  * Note that the declaration is already marked as static - if you need a
  39  * non-static version of this you're probably doing it wrong and will break the
  40  * THIS_MODULE reference by accident.
  41  */
  42 #define DEFINE_DRM_GEM_CMA_FOPS(name) \
  43         static const struct file_operations name = {\
  44                 .owner          = THIS_MODULE,\
  45                 .open           = drm_open,\
  46                 .release        = drm_release,\
  47                 .unlocked_ioctl = drm_ioctl,\
  48                 .compat_ioctl   = drm_compat_ioctl,\
  49                 .poll           = drm_poll,\
  50                 .read           = drm_read,\
  51                 .llseek         = noop_llseek,\
  52                 .mmap           = drm_gem_cma_mmap,\
  53                 .get_unmapped_area      = drm_gem_cma_get_unmapped_area,\
  54         }
  55
  56 /* free GEM object */
  57 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj);
  58
  59 /* create memory region for DRM framebuffer */
  60 int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
  61                                      struct drm_device *drm,
  62                                      struct drm_mode_create_dumb *args);
  63
  64 /* create memory region for DRM framebuffer */
  65 int drm_gem_cma_dumb_create(struct drm_file *file_priv,
  66                             struct drm_device *drm,
  67                             struct drm_mode_create_dumb *args);
  68
  69 /* map memory region for DRM framebuffer to user space */
  70 int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
  71                                 struct drm_device *drm, u32 handle,
  72                                 u64 *offset);
  73
  74 /* set vm_flags and we can change the VM attribute to other one at here */
  75 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
  76
  77 /* allocate physical memory */
  78 struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
  79                                               size_t size);
  80
  81 extern const struct vm_operations_struct drm_gem_cma_vm_ops;
  82
  83 #ifndef CONFIG_MMU
  84 unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
  85                                             unsigned long addr,
  86                                             unsigned long len,
  87                                             unsigned long pgoff,
  88                                             unsigned long flags);
  89 #else
  90 static inline unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
  91                                                           unsigned long addr,
  92                                                           unsigned long len,
  93                                                           unsigned long pgoff,
  94                                                           unsigned long flags)
  95 {
  96         return -EINVAL;
  97 }
  98 #endif
  99
 100 #ifdef CONFIG_DEBUG_FS
 101 void drm_gem_cma_describe(struct drm_gem_cma_object *obj, struct seq_file *m);
 102 #endif
 103
 104 struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
 105 struct drm_gem_object *
 106 drm_gem_cma_prime_import_sg_table(struct drm_device *dev,
 107                                   struct dma_buf_attachment *attach,
 108                                   struct sg_table *sgt);
 109 int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
 110                            struct vm_area_struct *vma);
 111 void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
 112 void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 113
 114 #endif /* __DRM_GEM_CMA_HELPER_H__ */