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
38static struct hash_table *fd_tab = NULL;
39static mtx_t lima_screen_mutex = _MTX_INITIALIZER_NP;
40
41static void
42lima_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
67struct pipe_screen *
68lima_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
98unlock:
99   mtx_unlock(&lima_screen_mutex);
100   return pscreen;
101}
102
103struct pipe_screen *
104lima_drm_screen_create_renderonly(struct renderonly *ro)
105{
106   return lima_screen_create(os_dupfd_cloexec(ro->gpu_fd), ro);
107}
108