1/*
2 * Copyright (c) 2015 Etnaviv 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, sub license,
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
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the 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 NON-INFRINGEMENT. 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 * Authors:
24 *    Christian Gmeiner <christian.gmeiner@gmail.com>
25 */
26
27#include <sys/stat.h>
28
29#include "util/os_file.h"
30#include "util/u_hash_table.h"
31#include "util/u_pointer.h"
32
33#include "etnaviv/etnaviv_screen.h"
34#include "etnaviv/hw/common.xml.h"
35#include "etnaviv_drm_public.h"
36
37#include <stdio.h>
38
39static uint32_t hash_file_description(const void *key)
40{
41   int fd = pointer_to_intptr(key);
42   struct stat stat;
43
44   // File descriptions can't be hashed, but it should be safe to assume
45   // that the same file description will always refer to he same file
46   if(fstat(fd, &stat) == -1)
47      return ~0; // Make sure fstat failing won't result in a random hash
48
49   return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
50}
51
52
53static bool equal_file_description(const void *key1, const void *key2)
54{
55   int ret;
56   int fd1 = pointer_to_intptr(key1);
57   int fd2 = pointer_to_intptr(key2);
58   struct stat stat1, stat2;
59
60   // If the file descriptors are the same, the file description will be too
61   // This will also catch sentinels, such as -1
62   if (fd1 == fd2)
63      return true;
64
65   ret = os_same_file_description(fd1, fd2);
66   if (ret >= 0)
67      return (ret == 0);
68
69   {
70      static bool has_warned;
71      if (!has_warned)
72         fprintf(stderr, "os_same_file_description couldn't determine if "
73                 "two DRM fds reference the same file description. (%s)\n"
74                 "Let's just assume that file descriptors for the same file probably"
75                 "share the file description instead. This may cause problems when"
76                 "that isn't the case.\n", strerror(errno));
77      has_warned = true;
78   }
79
80   // Let's at least check that it's the same file, different files can't
81   // have the same file descriptions
82   fstat(fd1, &stat1);
83   fstat(fd2, &stat2);
84
85   return stat1.st_dev == stat2.st_dev &&
86          stat1.st_ino == stat2.st_ino &&
87          stat1.st_rdev == stat2.st_rdev;
88}
89
90
91static struct hash_table *
92hash_table_create_file_description_keys(void)
93{
94   return _mesa_hash_table_create(NULL, hash_file_description, equal_file_description);
95}
96
97static struct pipe_screen *
98screen_create(int gpu_fd, struct renderonly *ro)
99{
100   struct etna_device *dev;
101   struct etna_gpu *gpu;
102   uint64_t val;
103   int i;
104
105   dev = etna_device_new_dup(gpu_fd);
106   if (!dev) {
107      fprintf(stderr, "Error creating device\n");
108      return NULL;
109   }
110
111   for (i = 0;; i++) {
112      gpu = etna_gpu_new(dev, i);
113      if (!gpu) {
114         fprintf(stderr, "Error creating gpu\n");
115         return NULL;
116      }
117
118      /* Look for a 3D capable GPU */
119      int ret = etna_gpu_get_param(gpu, ETNA_GPU_FEATURES_0, &val);
120      if (ret == 0 && (val & chipFeatures_PIPE_3D))
121         break;
122
123      etna_gpu_del(gpu);
124   }
125
126   return etna_screen_create(dev, gpu, ro);
127}
128
129static struct hash_table *fd_tab = NULL;
130
131static mtx_t etna_screen_mutex = _MTX_INITIALIZER_NP;
132
133static void
134etna_drm_screen_destroy(struct pipe_screen *pscreen)
135{
136   struct etna_screen *screen = etna_screen(pscreen);
137   boolean destroy;
138
139   mtx_lock(&etna_screen_mutex);
140   destroy = --screen->refcnt == 0;
141   if (destroy) {
142      int fd = etna_device_fd(screen->dev);
143      _mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(fd));
144
145      if (!fd_tab->entries) {
146         _mesa_hash_table_destroy(fd_tab, NULL);
147         fd_tab = NULL;
148      }
149   }
150   mtx_unlock(&etna_screen_mutex);
151
152   if (destroy) {
153      pscreen->destroy = screen->winsys_priv;
154      pscreen->destroy(pscreen);
155   }
156}
157
158static struct pipe_screen *
159etna_lookup_or_create_screen(int gpu_fd, struct renderonly *ro)
160{
161   struct pipe_screen *pscreen = NULL;
162
163   mtx_lock(&etna_screen_mutex);
164   if (!fd_tab) {
165      fd_tab = hash_table_create_file_description_keys();
166      if (!fd_tab)
167         goto unlock;
168   }
169
170   pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(gpu_fd));
171   if (pscreen) {
172      etna_screen(pscreen)->refcnt++;
173   } else {
174      pscreen = screen_create(gpu_fd, ro);
175      if (pscreen) {
176         int fd = etna_device_fd(etna_screen(pscreen)->dev);
177         _mesa_hash_table_insert(fd_tab, intptr_to_pointer(fd), pscreen);
178
179         /* Bit of a hack, to avoid circular linkage dependency,
180         * ie. pipe driver having to call in to winsys, we
181         * override the pipe drivers screen->destroy() */
182         etna_screen(pscreen)->winsys_priv = pscreen->destroy;
183         pscreen->destroy = etna_drm_screen_destroy;
184      }
185   }
186
187unlock:
188   mtx_unlock(&etna_screen_mutex);
189   return pscreen;
190}
191
192struct pipe_screen *
193etna_drm_screen_create_renderonly(struct renderonly *ro)
194{
195   return etna_lookup_or_create_screen(ro->gpu_fd, ro);
196}
197
198struct pipe_screen *
199etna_drm_screen_create(int fd)
200{
201   return etna_lookup_or_create_screen(fd, NULL);
202}
203