1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#include "igt.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/utsname.h>
#include <time.h>
/**
* TEST: gem reg read
* Category: Core
* Mega feature: General Core features
* Sub-category: uapi
* Functionality: ioctl
* Feature: gem_core
*
* SUBTEST: bad-register
*
* SUBTEST: timestamp-monotonic
*
* SUBTEST: timestamp-moving
*/
static bool is_x86_64;
static bool has_proper_timestamp;
struct local_drm_i915_reg_read {
__u64 offset;
__u64 val; /* Return value */
};
#define REG_READ_IOCTL DRM_IOWR(DRM_COMMAND_BASE + 0x31, struct local_drm_i915_reg_read)
#define RENDER_RING_TIMESTAMP 0x2358
static int read_register(int fd, uint64_t offset, uint64_t * val)
{
int ret = 0;
struct local_drm_i915_reg_read reg_read;
reg_read.offset = offset;
if (drmIoctl(fd, REG_READ_IOCTL, ®_read))
ret = -errno;
*val = reg_read.val;
return ret;
}
static bool check_kernel_x86_64(void)
{
int ret;
struct utsname uts;
ret = uname(&uts);
igt_assert_eq(ret, 0);
if (!strcmp(uts.machine, "x86_64"))
return true;
return false;
}
static bool check_timestamp(int fd)
{
int ret;
uint64_t val;
ret = read_register(fd, RENDER_RING_TIMESTAMP | 1, &val);
return ret == 0;
}
static int timer_query(int fd, uint64_t * val)
{
uint64_t offset;
int ret;
offset = RENDER_RING_TIMESTAMP;
if (has_proper_timestamp)
offset |= 1;
ret = read_register(fd, offset, val);
/*
* When reading the timestamp register with single 64b read, we are observing
* invalid values on x86_64:
*
* [f = valid counter value | X = garbage]
*
* i386: 0x0000000fffffffff
* x86_64: 0xffffffffXXXXXXXX
*
* In the absence of a corrected register read ioctl, attempt
* to fix up the return value to be vaguely useful.
*/
if (is_x86_64 && !has_proper_timestamp)
*val >>= 32;
return ret;
}
static void test_timestamp_moving(int fd)
{
uint64_t first_val, second_val;
igt_fail_on(timer_query(fd, &first_val) != 0);
sleep(1);
igt_fail_on(timer_query(fd, &second_val) != 0);
igt_assert(second_val != first_val);
}
static void test_timestamp_monotonic(int fd)
{
uint64_t first_val, second_val;
time_t start;
bool retry = true;
igt_fail_on(timer_query(fd, &first_val) != 0);
time(&start);
do {
retry:
igt_fail_on(timer_query(fd, &second_val) != 0);
if (second_val < first_val && retry) {
/* We may hit timestamp overflow once */
retry = false;
first_val = second_val;
goto retry;
}
igt_assert(second_val >= first_val);
} while(difftime(time(NULL), start) < 5);
}
igt_main
{
uint64_t val = 0;
int fd = -1;
igt_fixture {
fd = drm_open_driver(DRIVER_INTEL);
is_x86_64 = check_kernel_x86_64();
has_proper_timestamp = check_timestamp(fd);
}
igt_subtest("bad-register")
igt_assert_eq(read_register(fd, 0x12345678, &val), -EINVAL);
igt_subtest("timestamp-moving") {
igt_skip_on(timer_query(fd, &val) != 0);
test_timestamp_moving(fd);
}
igt_subtest("timestamp-monotonic") {
igt_skip_on(timer_query(fd, &val) != 0);
test_timestamp_monotonic(fd);
}
igt_fixture {
drm_close_driver(fd);
}
}
|
