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/u_hash_table.h"
30#include "util/u_memory.h"
31
32#include "etnaviv/etnaviv_screen.h"
33#include "etnaviv/hw/common.xml.h"
34#include "etnaviv_drm_public.h"
35
36#include <stdio.h>
37
38static struct pipe_screen *
39screen_create(struct renderonly *ro)
40{
41   struct etna_device *dev;
42   struct etna_gpu *gpu;
43   uint64_t val;
44   int i;
45
46   dev = etna_device_new_dup(ro->gpu_fd);
47   if (!dev) {
48      fprintf(stderr, "Error creating device\n");
49      return NULL;
50   }
51
52   for (i = 0;; i++) {
53      gpu = etna_gpu_new(dev, i);
54      if (!gpu) {
55         fprintf(stderr, "Error creating gpu\n");
56         return NULL;
57      }
58
59      /* Look for a 3D capable GPU */
60      int ret = etna_gpu_get_param(gpu, ETNA_GPU_FEATURES_0, &val);
61      if (ret == 0 && (val & chipFeatures_PIPE_3D))
62         break;
63
64      etna_gpu_del(gpu);
65   }
66
67   return etna_screen_create(dev, gpu, ro);
68}
69
70static struct util_hash_table *etna_tab = NULL;
71
72static mtx_t etna_screen_mutex = _MTX_INITIALIZER_NP;
73
74static void
75etna_drm_screen_destroy(struct pipe_screen *pscreen)
76{
77   struct etna_screen *screen = etna_screen(pscreen);
78   boolean destroy;
79
80   mtx_lock(&etna_screen_mutex);
81   destroy = --screen->refcnt == 0;
82   if (destroy) {
83      int fd = etna_device_fd(screen->dev);
84      util_hash_table_remove(etna_tab, intptr_to_pointer(fd));
85   }
86   mtx_unlock(&etna_screen_mutex);
87
88   if (destroy) {
89      pscreen->destroy = screen->winsys_priv;
90      pscreen->destroy(pscreen);
91   }
92}
93
94static unsigned hash_fd(void *key)
95{
96   int fd = pointer_to_intptr(key);
97   struct stat stat;
98
99   fstat(fd, &stat);
100
101   return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
102}
103
104static int compare_fd(void *key1, void *key2)
105{
106   int fd1 = pointer_to_intptr(key1);
107   int fd2 = pointer_to_intptr(key2);
108   struct stat stat1, stat2;
109
110   fstat(fd1, &stat1);
111   fstat(fd2, &stat2);
112
113   return stat1.st_dev != stat2.st_dev ||
114          stat1.st_ino != stat2.st_ino ||
115          stat1.st_rdev != stat2.st_rdev;
116}
117
118struct pipe_screen *
119etna_drm_screen_create_renderonly(struct renderonly *ro)
120{
121   struct pipe_screen *pscreen = NULL;
122
123   mtx_lock(&etna_screen_mutex);
124   if (!etna_tab) {
125      etna_tab = util_hash_table_create(hash_fd, compare_fd);
126      if (!etna_tab)
127         goto unlock;
128   }
129
130   pscreen = util_hash_table_get(etna_tab, intptr_to_pointer(ro->gpu_fd));
131   if (pscreen) {
132      etna_screen(pscreen)->refcnt++;
133   } else {
134      pscreen = screen_create(ro);
135      if (pscreen) {
136         int fd = etna_device_fd(etna_screen(pscreen)->dev);
137         util_hash_table_set(etna_tab, intptr_to_pointer(fd), pscreen);
138
139         /* Bit of a hack, to avoid circular linkage dependency,
140         * ie. pipe driver having to call in to winsys, we
141         * override the pipe drivers screen->destroy() */
142         etna_screen(pscreen)->winsys_priv = pscreen->destroy;
143      pscreen->destroy = etna_drm_screen_destroy;
144      }
145   }
146
147unlock:
148   mtx_unlock(&etna_screen_mutex);
149   return pscreen;
150}
151
152struct pipe_screen *
153etna_drm_screen_create(int fd)
154{
155   struct renderonly ro = {
156      .create_for_resource = renderonly_create_gpu_import_for_resource,
157      .kms_fd = -1,
158      .gpu_fd = fd
159   };
160
161   return etna_drm_screen_create_renderonly(&ro);
162}
163