1/*
2 * Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
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 FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 *    Rob Clark <robclark@freedesktop.org>
25 */
26
27#include <sys/stat.h>
28
29#include "pipe/p_context.h"
30#include "pipe/p_state.h"
31#include "util/format/u_format.h"
32#include "util/u_memory.h"
33#include "util/u_inlines.h"
34#include "util/u_hash_table.h"
35#include "util/u_pointer.h"
36#include "os/os_thread.h"
37
38#include "freedreno_drm_public.h"
39
40#include "freedreno/freedreno_screen.h"
41
42static struct hash_table *fd_tab = NULL;
43
44static mtx_t fd_screen_mutex = _MTX_INITIALIZER_NP;
45
46static void
47fd_drm_screen_destroy(struct pipe_screen *pscreen)
48{
49	struct fd_screen *screen = fd_screen(pscreen);
50	boolean destroy;
51
52	mtx_lock(&fd_screen_mutex);
53	destroy = --screen->refcnt == 0;
54	if (destroy) {
55		int fd = fd_device_fd(screen->dev);
56		_mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(fd));
57
58		if (!fd_tab->entries) {
59			_mesa_hash_table_destroy(fd_tab, NULL);
60			fd_tab = NULL;
61		}
62	}
63	mtx_unlock(&fd_screen_mutex);
64
65	if (destroy) {
66		pscreen->destroy = screen->winsys_priv;
67		pscreen->destroy(pscreen);
68	}
69}
70
71struct pipe_screen *
72fd_drm_screen_create(int fd, struct renderonly *ro,
73		const struct pipe_screen_config *config)
74{
75	struct pipe_screen *pscreen = NULL;
76
77	mtx_lock(&fd_screen_mutex);
78	if (!fd_tab) {
79		fd_tab = util_hash_table_create_fd_keys();
80		if (!fd_tab)
81			goto unlock;
82	}
83
84	pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
85	if (pscreen) {
86		fd_screen(pscreen)->refcnt++;
87	} else {
88		struct fd_device *dev = fd_device_new_dup(fd);
89		if (!dev)
90			goto unlock;
91
92		pscreen = fd_screen_create(dev, ro, config);
93		if (pscreen) {
94			int fd = fd_device_fd(dev);
95
96			_mesa_hash_table_insert(fd_tab, intptr_to_pointer(fd), pscreen);
97
98			/* Bit of a hack, to avoid circular linkage dependency,
99			 * ie. pipe driver having to call in to winsys, we
100			 * override the pipe drivers screen->destroy():
101			 */
102			fd_screen(pscreen)->winsys_priv = pscreen->destroy;
103			pscreen->destroy = fd_drm_screen_destroy;
104		}
105	}
106
107unlock:
108	mtx_unlock(&fd_screen_mutex);
109	return pscreen;
110}
111