1 /*
2 * Copyright © 2013 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 DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25 #include <sys/stat.h>
26 #include <unistd.h>
27 #include <fcntl.h>
28 #include <errno.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <ctype.h>
33
34 #include "igt_perf.h"
35
36 #include "gem-interrupts.h"
37 #include "debugfs.h"
38
debugfs_read(void)39 static long long debugfs_read(void)
40 {
41 char buf[8192], *b;
42 int fd, len;
43
44 sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
45 fd = open(buf, 0);
46 if (fd < 0)
47 return -1;
48
49 len = read(fd, buf, sizeof(buf)-1);
50 close(fd);
51
52 if (len < 0)
53 return -1;
54
55 buf[len] = '\0';
56
57 b = strstr(buf, "Interrupts received:");
58 if (b == NULL)
59 return -1;
60
61 return strtoull(b + sizeof("Interrupts received:"), 0, 0);
62 }
63
procfs_read(void)64 static long long procfs_read(void)
65 {
66 char buf[8192], *b;
67 int fd, len;
68 unsigned long long val;
69
70 /* 44: 51 42446 0 0 PCI-MSI-edge i915*/
71 fd = open("/proc/interrupts", 0);
72 if (fd < 0)
73 return -1;
74
75 len = read(fd, buf, sizeof(buf)-1);
76 close(fd);
77
78 if (len < 0)
79 return -1;
80
81 buf[len] = '\0';
82
83 b = strstr(buf, "i915");
84 if (b == NULL)
85 return -1;
86 while (*--b != ':')
87 ;
88
89 val = 0;
90 do {
91 while (isspace(*++b))
92 ;
93 if (!isdigit(*b))
94 break;
95
96 val += strtoull(b, &b, 0);
97 } while(1);
98
99 return val;
100 }
101
interrupts_read(void)102 static long long interrupts_read(void)
103 {
104 long long val;
105
106 val = debugfs_read();
107 if (val < 0)
108 val = procfs_read();
109 return val;
110 }
111
gem_interrupts_init(struct gem_interrupts * irqs)112 int gem_interrupts_init(struct gem_interrupts *irqs)
113 {
114 memset(irqs, 0, sizeof(*irqs));
115
116 irqs->fd = perf_i915_open(I915_PMU_INTERRUPTS);
117 if (irqs->fd < 0 && interrupts_read() < 0)
118 irqs->error = ENODEV;
119
120 return irqs->error;
121 }
122
gem_interrupts_update(struct gem_interrupts * irqs)123 int gem_interrupts_update(struct gem_interrupts *irqs)
124 {
125 uint64_t val;
126 int update;
127
128 if (irqs->error)
129 return irqs->error;
130
131 if (irqs->fd < 0) {
132 long long ret;
133 ret = interrupts_read();
134 if (ret < 0)
135 return irqs->error = ENODEV;
136 else
137 val = ret;
138 } else {
139 uint64_t data[2];
140
141 if (read(irqs->fd, data, sizeof(data)) < 0)
142 return irqs->error = errno;
143
144 val = data[0];
145 }
146
147 update = irqs->last_count == 0;
148 irqs->last_count = irqs->count;
149 irqs->count = val;
150 irqs->delta = irqs->count - irqs->last_count;
151 return update ? EAGAIN : 0;
152 }
153