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