1 /*
2 * Copyright © 2017 Lima Project
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 DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include <unistd.h>
25 #include <fcntl.h>
26 #include <sys/stat.h>
27
28 #include "c11/threads.h"
29 #include "util/os_file.h"
30 #include "util/u_hash_table.h"
31 #include "util/u_pointer.h"
32 #include "renderonly/renderonly.h"
33
34 #include "lima_drm_public.h"
35
36 #include "lima/lima_screen.h"
37
38 static struct hash_table *fd_tab = NULL;
39 static mtx_t lima_screen_mutex = _MTX_INITIALIZER_NP;
40
41 static void
lima_drm_screen_destroy(struct pipe_screen * pscreen)42 lima_drm_screen_destroy(struct pipe_screen *pscreen)
43 {
44 struct lima_screen *screen = lima_screen(pscreen);
45 boolean destroy;
46 int fd = screen->fd;
47
48 mtx_lock(&lima_screen_mutex);
49 destroy = --screen->refcnt == 0;
50 if (destroy) {
51 _mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(fd));
52
53 if (!fd_tab->entries) {
54 _mesa_hash_table_destroy(fd_tab, NULL);
55 fd_tab = NULL;
56 }
57 }
58 mtx_unlock(&lima_screen_mutex);
59
60 if (destroy) {
61 pscreen->destroy = screen->winsys_priv;
62 pscreen->destroy(pscreen);
63 close(fd);
64 }
65 }
66
67 struct pipe_screen *
lima_drm_screen_create(int fd)68 lima_drm_screen_create(int fd)
69 {
70 struct pipe_screen *pscreen = NULL;
71
72 mtx_lock(&lima_screen_mutex);
73 if (!fd_tab) {
74 fd_tab = util_hash_table_create_fd_keys();
75 if (!fd_tab)
76 goto unlock;
77 }
78
79 pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
80 if (pscreen) {
81 lima_screen(pscreen)->refcnt++;
82 } else {
83 int dup_fd = os_dupfd_cloexec(fd);
84
85 pscreen = lima_screen_create(dup_fd, NULL);
86 if (pscreen) {
87 _mesa_hash_table_insert(fd_tab, intptr_to_pointer(dup_fd), pscreen);
88
89 /* Bit of a hack, to avoid circular linkage dependency,
90 * ie. pipe driver having to call in to winsys, we
91 * override the pipe drivers screen->destroy():
92 */
93 lima_screen(pscreen)->winsys_priv = pscreen->destroy;
94 pscreen->destroy = lima_drm_screen_destroy;
95 }
96 }
97
98 unlock:
99 mtx_unlock(&lima_screen_mutex);
100 return pscreen;
101 }
102
103 struct pipe_screen *
lima_drm_screen_create_renderonly(struct renderonly * ro)104 lima_drm_screen_create_renderonly(struct renderonly *ro)
105 {
106 return lima_screen_create(os_dupfd_cloexec(ro->gpu_fd), ro);
107 }
108