1 /*
2  * Copyright © 2018 Broadcom
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  */
23 
24 #include <c11/threads.h>
25 
26 #include "util/macros.h"
27 #include "util/hash_table.h"
28 #include "util/vma.h"
29 
30 #include <xf86drm.h>
31 
32 #ifdef __linux__
33 #define DRM_MAJOR 226
34 #endif
35 
36 typedef int (*ioctl_fn_t)(int fd, unsigned long request, void *arg);
37 
38 struct shim_bo;
39 
40 struct shim_device {
41    /* Mapping from int fd to struct shim_fd *. */
42    struct hash_table *fd_map;
43 
44    mtx_t mem_lock;
45    /* Heap from which shim_bo are allocated */
46    struct util_vma_heap mem_heap;
47 
48    int mem_fd;
49 
50    int (**driver_ioctls)(int fd, unsigned long request, void *arg);
51    int driver_ioctl_count;
52 
53    void (*driver_bo_free)(struct shim_bo *bo);
54 
55    /* Returned by drmGetVersion(). */
56    const char *driver_name;
57    int version_major, version_minor, version_patchlevel;
58    int bus_type;
59 };
60 
61 extern struct shim_device shim_device;
62 
63 struct shim_fd {
64    int fd;
65    mtx_t handle_lock;
66    /* mapping from int gem handle to struct shim_bo *. */
67    struct hash_table *handles;
68 };
69 
70 struct shim_bo {
71    uint64_t mem_addr;
72    void *map;
73    int refcount;
74    uint32_t size;
75 };
76 
77 /* Core support. */
78 extern int render_node_minor;
79 void drm_shim_device_init(void);
80 void drm_shim_override_file(const char *contents,
81                             const char *path_format, ...) PRINTFLIKE(2, 3);
82 void drm_shim_fd_register(int fd, struct shim_fd *shim_fd);
83 struct shim_fd *drm_shim_fd_lookup(int fd);
84 int drm_shim_ioctl(int fd, unsigned long request, void *arg);
85 void *drm_shim_mmap(struct shim_fd *shim_fd, size_t length, int prot, int flags,
86                     int fd, off_t offset);
87 
88 void drm_shim_bo_init(struct shim_bo *bo, size_t size);
89 void drm_shim_bo_get(struct shim_bo *bo);
90 void drm_shim_bo_put(struct shim_bo *bo);
91 struct shim_bo *drm_shim_bo_lookup(struct shim_fd *shim_fd, int handle);
92 int drm_shim_bo_get_handle(struct shim_fd *shim_fd, struct shim_bo *bo);
93 uint64_t drm_shim_bo_get_mmap_offset(struct shim_fd *shim_fd,
94                                      struct shim_bo *bo);
95 
96 /* driver-specific hooks. */
97 void drm_shim_driver_init(void);
98 extern bool drm_shim_driver_prefers_new_render_node;
99