1 /*
2 * Copyright © 2011 Intel Corporation
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, sublicense,
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 next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * 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 NONINFRINGEMENT. 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 * Ben Widawsky <ben@bwidawsk.net>
25 *
26 */
27
28 #include <assert.h>
29 #include <err.h>
30 #include <string.h>
31 #include <stdarg.h>
32 #include <stdbool.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <syslog.h>
36 #include <unistd.h>
37 #include "intel_io.h"
38 #include "intel_chipset.h"
39 #include "drmtest.h"
40
41 bool daemonized;
42
43 #define INFO_PRINT(...) \
44 do { \
45 if (daemonized) \
46 syslog(LOG_INFO, ##__VA_ARGS__); \
47 else \
48 fprintf(stdout, ##__VA_ARGS__); \
49 } while(0)
50
51 static void
help(char * prog)52 help(char *prog) {
53 printf("%s Prevents the GT from sleeping.\n\n", prog);
54 printf("usage: %s [options] \n\n", prog);
55 printf("Options: \n");
56 printf(" -b Run in background/daemon mode\n");
57 }
58
59 static int
is_alive(void)60 is_alive(void) {
61 /* Read the timestamp, which should *almost* always be !0 */
62 return (intel_register_read(0x2358) != 0);
63 }
64
main(int argc,char * argv[])65 int main(int argc, char *argv[])
66 {
67 int ret;
68
69 if (argc > 2 || (argc == 2 && !strncmp(argv[1], "-h", 2))) {
70 help(argv[1]);
71 exit(0);
72 }
73
74 if (argc == 2 && (!strncmp(argv[1], "-b", 2)))
75 daemonized = true;
76
77 if (daemonized) {
78 assert(daemon(0, 0) == 0);
79 openlog(argv[0], LOG_CONS | LOG_PID, LOG_USER);
80 INFO_PRINT("started daemon");
81 }
82
83 ret = intel_register_access_init(intel_get_pci_device(), 1, -1);
84 if (ret) {
85 INFO_PRINT("Couldn't init register access\n");
86 exit(1);
87 } else {
88 INFO_PRINT("Forcewake locked\n");
89 }
90 while(1) {
91 if (!is_alive()) {
92 INFO_PRINT("gpu reset? restarting daemon\n");
93 intel_register_access_fini();
94 ret = intel_register_access_init(intel_get_pci_device(), 1, -1);
95 if (ret)
96 INFO_PRINT("Reg access init fail\n");
97 }
98 sleep(1);
99 }
100 intel_register_access_fini();
101 INFO_PRINT("Forcewake unlock\n");
102
103 if (daemonized) {
104 INFO_PRINT("finished\n");
105 closelog();
106 }
107
108 return 0;
109 }
110