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
|
/*
* Copyright © 2017 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.
*/
#include <stdbool.h>
#include "igt_core.h"
#include "igt_sysfs.h"
#include "i915/gem_submission.h"
/**
* SECTION:gem_submission
* @short_description: Helpers for determining submission method
* @title: GEM Submission
*
* This helper library contains functions used for getting information on
* currently used hardware submission method. Different generations of hardware
* support different submission backends, currently we're distinguishing 3
* different methods: legacy ringbuffer submission, execlists, GuC submission.
* For legacy ringbuffer submission, there's also a variation where we're using
* semaphores for synchronization between engines.
*/
/**
* gem_submission_method:
* @fd: open i915 drm file descriptor
*
* Returns: Submission method bitmap.
*/
unsigned gem_submission_method(int fd)
{
unsigned flags = 0;
bool active;
int dir;
dir = igt_sysfs_open_parameters(fd);
if (dir < 0)
return 0;
active = igt_sysfs_get_boolean(dir, "enable_guc_submission");
if (active) {
flags |= GEM_SUBMISSION_GUC | GEM_SUBMISSION_EXECLISTS;
goto out;
}
active = igt_sysfs_get_boolean(dir, "enable_execlists");
if (active) {
flags |= GEM_SUBMISSION_EXECLISTS;
goto out;
}
active = igt_sysfs_get_boolean(dir, "semaphores");
if (active) {
flags |= GEM_SUBMISSION_SEMAPHORES;
}
out:
close(dir);
return flags;
}
/**
* gem_submission_print_method:
* @fd: open i915 drm file descriptor
*
* Helper for pretty-printing currently used submission method
*/
void gem_submission_print_method(int fd)
{
const unsigned flags = gem_submission_method(fd);
if (flags & GEM_SUBMISSION_GUC) {
igt_info("Using GuC submission\n");
return;
}
if (flags & GEM_SUBMISSION_EXECLISTS) {
igt_info("Using Execlists submission\n");
return;
}
igt_info("Using Legacy submission%s\n",
flags & GEM_SUBMISSION_SEMAPHORES ? ", with semaphores" : "");
}
/**
* gem_has_semaphores:
* @fd: open i915 drm file descriptor
*
* Feature test macro to query whether the driver is using semaphores for
* synchronization between engines.
*/
bool gem_has_semaphores(int fd)
{
return gem_submission_method(fd) & GEM_SUBMISSION_SEMAPHORES;
}
/**
* gem_has_execlists:
* @fd: open i915 drm file descriptor
*
* Feature test macro to query whether the driver is using execlists as a
* hardware submission method.
*/
bool gem_has_execlists(int fd)
{
return gem_submission_method(fd) & GEM_SUBMISSION_EXECLISTS;
}
|
