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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__ */