1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __DRM_GEM_DMA_HELPER_H__
3 #define __DRM_GEM_DMA_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_dma_object - GEM object backed by DMA memory allocations
13 * @base: base GEM object
14 * @dma_addr: DMA 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 * @map_noncoherent: if true, the GEM object is backed by non-coherent memory
20 */
21 struct drm_gem_dma_object {
22 struct drm_gem_object base;
23 dma_addr_t dma_addr;
24 struct sg_table *sgt;
25
26 /* For objects with DMA memory allocated by GEM DMA */
27 void *vaddr;
28
29 bool map_noncoherent;
30 };
31
32 #define to_drm_gem_dma_obj(gem_obj) \
33 container_of(gem_obj, struct drm_gem_dma_object, base)
34
35 struct drm_gem_dma_object *drm_gem_dma_create(struct drm_device *drm,
36 size_t size);
37 void drm_gem_dma_free(struct drm_gem_dma_object *dma_obj);
38 void drm_gem_dma_print_info(const struct drm_gem_dma_object *dma_obj,
39 struct drm_printer *p, unsigned int indent);
40 struct sg_table *drm_gem_dma_get_sg_table(struct drm_gem_dma_object *dma_obj);
41 int drm_gem_dma_vmap(struct drm_gem_dma_object *dma_obj,
42 struct iosys_map *map);
43 int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *vma);
44
45 extern const struct vm_operations_struct drm_gem_dma_vm_ops;
46
47 /*
48 * GEM object functions
49 */
50
51 /**
52 * drm_gem_dma_object_free - GEM object function for drm_gem_dma_free()
53 * @obj: GEM object to free
54 *
55 * This function wraps drm_gem_dma_free_object(). Drivers that employ the DMA helpers
56 * should use it as their &drm_gem_object_funcs.free handler.
57 */
58 static inline void drm_gem_dma_object_free(struct drm_gem_object *obj)
59 {
60 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
61
62 drm_gem_dma_free(dma_obj);
63 }
64
65 /**
66 * drm_gem_dma_object_print_info() - Print &drm_gem_dma_object info for debugfs
67 * @p: DRM printer
68 * @indent: Tab indentation level
69 * @obj: GEM object
70 *
71 * This function wraps drm_gem_dma_print_info(). Drivers that employ the DMA helpers
72 * should use this function as their &drm_gem_object_funcs.print_info handler.
73 */
74 static inline void drm_gem_dma_object_print_info(struct drm_printer *p, unsigned int indent,
75 const struct drm_gem_object *obj)
76 {
77 const struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
78
79 drm_gem_dma_print_info(dma_obj, p, indent);
80 }
81
82 /**
83 * drm_gem_dma_object_get_sg_table - GEM object function for drm_gem_dma_get_sg_table()
84 * @obj: GEM object
85 *
86 * This function wraps drm_gem_dma_get_sg_table(). Drivers that employ the DMA helpers should
87 * use it as their &drm_gem_object_funcs.get_sg_table handler.
88 *
89 * Returns:
90 * A pointer to the scatter/gather table of pinned pages or NULL on failure.
91 */
92 static inline struct sg_table *drm_gem_dma_object_get_sg_table(struct drm_gem_object *obj)
93 {
94 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
95
96 return drm_gem_dma_get_sg_table(dma_obj);
97 }
98
99 /*
100 * drm_gem_dma_object_vmap - GEM object function for drm_gem_dma_vmap()
101 * @obj: GEM object
102 * @map: Returns the kernel virtual address of the DMA GEM object's backing store.
103 *
104 * This function wraps drm_gem_dma_vmap(). Drivers that employ the DMA helpers should
105 * use it as their &drm_gem_object_funcs.vmap handler.
106 *
107 * Returns:
108 * 0 on success or a negative error code on failure.
109 */
110 static inline int drm_gem_dma_object_vmap(struct drm_gem_object *obj,
111 struct iosys_map *map)
112 {
113 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
114
115 return drm_gem_dma_vmap(dma_obj, map);
116 }
117
118 /**
119 * drm_gem_dma_object_mmap - GEM object function for drm_gem_dma_mmap()
120 * @obj: GEM object
121 * @vma: VMA for the area to be mapped
122 *
123 * This function wraps drm_gem_dma_mmap(). Drivers that employ the dma helpers should
124 * use it as their &drm_gem_object_funcs.mmap handler.
125 *
126 * Returns:
127 * 0 on success or a negative error code on failure.
128 */
129 static inline int drm_gem_dma_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
130 {
131 struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
132
133 return drm_gem_dma_mmap(dma_obj, vma);
134 }
135
136 /*
137 * Driver ops
138 */
139
140 /* create memory region for DRM framebuffer */
141 int drm_gem_dma_dumb_create_internal(struct drm_file *file_priv,
142 struct drm_device *drm,
143 struct drm_mode_create_dumb *args);
144
145 /* create memory region for DRM framebuffer */
146 int drm_gem_dma_dumb_create(struct drm_file *file_priv,
147 struct drm_device *drm,
148 struct drm_mode_create_dumb *args);
149
150 struct drm_gem_object *
151 drm_gem_dma_prime_import_sg_table(struct drm_device *dev,
152 struct dma_buf_attachment *attach,
153 struct sg_table *sgt);
154
155 /**
156 * DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE - DMA GEM driver operations
157 * @dumb_create_func: callback function for .dumb_create
158 *
159 * This macro provides a shortcut for setting the default GEM operations in the
160 * &drm_driver structure.
161 *
162 * This macro is a variant of DRM_GEM_DMA_DRIVER_OPS for drivers that
163 * override the default implementation of &struct rm_driver.dumb_create. Use
164 * DRM_GEM_DMA_DRIVER_OPS if possible. Drivers that require a virtual address
165 * on imported buffers should use
166 * DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead.
167 */
168 #define DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(dumb_create_func) \
169 .dumb_create = (dumb_create_func), \
170 .gem_prime_import_sg_table = drm_gem_dma_prime_import_sg_table
171
172 /**
173 * DRM_GEM_DMA_DRIVER_OPS - DMA GEM driver operations
174 *
175 * This macro provides a shortcut for setting the default GEM operations in the
176 * &drm_driver structure.
177 *
178 * Drivers that come with their own implementation of
179 * &struct drm_driver.dumb_create should use
180 * DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() instead. Use
181 * DRM_GEM_DMA_DRIVER_OPS if possible. Drivers that require a virtual address
182 * on imported buffers should use DRM_GEM_DMA_DRIVER_OPS_VMAP instead.
183 */
184 #define DRM_GEM_DMA_DRIVER_OPS \
185 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_gem_dma_dumb_create)
186
187 /**
188 * DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE - DMA GEM driver operations
189 * ensuring a virtual address
190 * on the buffer
191 * @dumb_create_func: callback function for .dumb_create
192 *
193 * This macro provides a shortcut for setting the default GEM operations in the
194 * &drm_driver structure for drivers that need the virtual address also on
195 * imported buffers.
196 *
197 * This macro is a variant of DRM_GEM_DMA_DRIVER_OPS_VMAP for drivers that
198 * override the default implementation of &struct drm_driver.dumb_create. Use
199 * DRM_GEM_DMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a
200 * virtual address on imported buffers should use
201 * DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE() instead.
202 */
203 #define DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(dumb_create_func) \
204 .dumb_create = (dumb_create_func), \
205 .gem_prime_import_sg_table = drm_gem_dma_prime_import_sg_table_vmap
206
207 /**
208 * DRM_GEM_DMA_DRIVER_OPS_VMAP - DMA GEM driver operations ensuring a virtual
209 * address on the buffer
210 *
211 * This macro provides a shortcut for setting the default GEM operations in the
212 * &drm_driver structure for drivers that need the virtual address also on
213 * imported buffers.
214 *
215 * Drivers that come with their own implementation of
216 * &struct drm_driver.dumb_create should use
217 * DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE() instead. Use
218 * DRM_GEM_DMA_DRIVER_OPS_VMAP if possible. Drivers that do not require a
219 * virtual address on imported buffers should use DRM_GEM_DMA_DRIVER_OPS
220 * instead.
221 */
222 #define DRM_GEM_DMA_DRIVER_OPS_VMAP \
223 DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(drm_gem_dma_dumb_create)
224
225 struct drm_gem_object *
226 drm_gem_dma_prime_import_sg_table_vmap(struct drm_device *drm,
227 struct dma_buf_attachment *attach,
228 struct sg_table *sgt);
229
230 /*
231 * File ops
232 */
233
234 #ifndef CONFIG_MMU
235 unsigned long drm_gem_dma_get_unmapped_area(struct file *filp,
236 unsigned long addr,
237 unsigned long len,
238 unsigned long pgoff,
239 unsigned long flags);
240 #define DRM_GEM_DMA_UNMAPPED_AREA_FOPS \
241 .get_unmapped_area = drm_gem_dma_get_unmapped_area,
242 #else
243 #define DRM_GEM_DMA_UNMAPPED_AREA_FOPS
244 #endif
245
246 /**
247 * DEFINE_DRM_GEM_DMA_FOPS() - macro to generate file operations for DMA drivers
248 * @name: name for the generated structure
249 *
250 * This macro autogenerates a suitable &struct file_operations for DMA based
251 * drivers, which can be assigned to &drm_driver.fops. Note that this structure
252 * cannot be shared between drivers, because it contains a reference to the
253 * current module using THIS_MODULE.
254 *
255 * Note that the declaration is already marked as static - if you need a
256 * non-static version of this you're probably doing it wrong and will break the
257 * THIS_MODULE reference by accident.
258 */
259 #define DEFINE_DRM_GEM_DMA_FOPS(name) \
260 static const struct file_operations name = {\
261 .owner = THIS_MODULE,\
262 .open = drm_open,\
263 .release = drm_release,\
264 .unlocked_ioctl = drm_ioctl,\
265 .compat_ioctl = drm_compat_ioctl,\
266 .poll = drm_poll,\
267 .read = drm_read,\
268 .llseek = noop_llseek,\
269 .mmap = drm_gem_mmap,\
270 DRM_GEM_DMA_UNMAPPED_AREA_FOPS \
271 }
272
273 #endif /* __DRM_GEM_DMA_HELPER_H__ */
274
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