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 <unistd.h>
26 #include <fcntl.h>
27 #include <errno.h>
28 #include <string.h>
29 #include <stdio.h>
30
31 #include "igt_perf.h"
32
33 #include "gpu-freq.h"
34 #include "debugfs.h"
35
perf_open(void)36 static int perf_open(void)
37 {
38 int fd;
39
40 fd = perf_i915_open_group(I915_PMU_ACTUAL_FREQUENCY, -1);
41 if (perf_i915_open_group(I915_PMU_REQUESTED_FREQUENCY, fd) < 0) {
42 close(fd);
43 fd = -1;
44 }
45
46 return fd;
47 }
48
gpu_freq_init(struct gpu_freq * gf)49 int gpu_freq_init(struct gpu_freq *gf)
50 {
51 char buf[4096], *s;
52 int fd, len = -1;
53
54 memset(gf, 0, sizeof(*gf));
55
56 gf->fd = perf_open();
57
58 sprintf(buf, "%s/i915_frequency_info", debugfs_dri_path);
59 fd = open(buf, 0);
60 if (fd < 0) {
61 sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
62 fd = open(buf, 0);
63 }
64 if (fd < 0)
65 return gf->error = errno;
66
67 len = read(fd, buf, sizeof(buf)-1);
68 close(fd);
69 if (len < 0)
70 goto err;
71
72 buf[len] = '\0';
73
74 if (strstr(buf, "PUNIT_REG_GPU_FREQ_STS")) {
75 /* Baytrail is special, ofc. */
76 gf->is_byt = 1;
77
78 s = strstr(buf, "max");
79 if (s != NULL)
80 sscanf(s, "max GPU freq: %d MHz", &gf->max);
81
82 s = strstr(buf, "min");
83 if (s != NULL)
84 sscanf(s, "min GPU freq: %d MHz", &gf->min);
85
86 gf->rp0 = gf->rp1 = gf->max;
87 gf->rpn = gf->min;
88 } else {
89 s = strstr(buf, "(RPN)");
90 if (s == NULL)
91 goto err;
92 sscanf(s, "(RPN) frequency: %dMHz", &gf->rpn);
93
94 s = strstr(s, "(RP1)");
95 if (s == NULL)
96 goto err;
97 sscanf(s, "(RP1) frequency: %dMHz", &gf->rp1);
98
99 s = strstr(s, "(RP0)");
100 if (s == NULL)
101 goto err;
102 sscanf(s, "(RP0) frequency: %dMHz", &gf->rp0);
103
104 s = strstr(s, "Max");
105 if (s == NULL)
106 goto err;
107 sscanf(s, "Max overclocked frequency: %dMHz", &gf->max);
108 gf->min = gf->rpn;
109 }
110
111 return 0;
112
113 err:
114 return gf->error = EIO;
115 }
116
gpu_freq_update(struct gpu_freq * gf)117 int gpu_freq_update(struct gpu_freq *gf)
118 {
119 if (gf->error)
120 return gf->error;
121
122 if (gf->fd < 0) {
123 char buf[4096], *s;
124 int fd, len = -1;
125
126 sprintf(buf, "%s/i915_frequency_info", debugfs_dri_path);
127 fd = open(buf, 0);
128 if (fd < 0) {
129 sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
130 fd = open(buf, 0);
131 }
132 if (fd < 0)
133 return gf->error = errno;
134
135 len = read(fd, buf, sizeof(buf)-1);
136 close(fd);
137 if (len < 0)
138 return gf->error = EIO;
139
140 buf[len] = '\0';
141
142 if (gf->is_byt) {
143 s = strstr(buf, "current");
144 if (s)
145 sscanf(s, "current GPU freq: %d MHz", &gf->current);
146 gf->request = gf->current;
147 } else {
148 s = strstr(buf, "RPNSWREQ:");
149 if (s)
150 sscanf(s, "RPNSWREQ: %dMHz", &gf->request);
151
152 s = strstr(buf, "CAGF:");
153 if (s)
154 sscanf(s, "CAGF: %dMHz", &gf->current);
155 }
156 } else {
157 struct gpu_freq_stat *s = &gf->stat[gf->count++&1];
158 struct gpu_freq_stat *d = &gf->stat[gf->count&1];
159 uint64_t data[4], d_time;
160 int len;
161
162 len = read(gf->fd, data, sizeof(data));
163 if (len < 0)
164 return gf->error = errno;
165
166 s->timestamp = data[1];
167 s->act = data[2];
168 s->req = data[3];
169
170 if (gf->count == 1)
171 return EAGAIN;
172
173 d_time = s->timestamp - d->timestamp;
174 if (d_time == 0) {
175 gf->count--;
176 return EAGAIN;
177 }
178
179 gf->current = (s->act - d->act) * 1e9 / d_time;
180 gf->request = (s->req - d->req) * 1e9 / d_time;
181 }
182
183 return 0;
184 }
185