summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/gpu/drm/nouveau/nouveau_sysfs.c
blob: 1ec8f38ae69a030952c88cc685ca7335b5e4275d (plain)
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
190
191
192
193
194
195
196
197
198
/*
 * Copyright 2013 Red Hat Inc.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 Skeggs <bskeggs@redhat.com>
 */

#include <nvif/os.h>
#include <nvif/class.h>
#include <nvif/ioctl.h>

#include "nouveau_sysfs.h"

MODULE_PARM_DESC(pstate, "enable sysfs pstate file, which will be moved in the future");
int nouveau_pstate;
module_param_named(pstate, nouveau_pstate, int, 0400);

static inline struct drm_device *
drm_device(struct device *d)
{
	return dev_get_drvdata(d);
}

#define snappendf(p,r,f,a...) do {                                             \
	snprintf(p, r, f, ##a);                                                \
	r -= strlen(p);                                                        \
	p += strlen(p);                                                        \
} while(0)

static ssize_t
nouveau_sysfs_pstate_get(struct device *d, struct device_attribute *a, char *b)
{
	struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d));
	struct nvif_control_pstate_info_v0 info = {};
	size_t cnt = PAGE_SIZE;
	char *buf = b;
	int ret, i;

	ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_INFO,
			&info, sizeof(info));
	if (ret)
		return ret;

	for (i = 0; i < info.count + 1; i++) {
		const s32 state = i < info.count ? i :
			NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT;
		struct nvif_control_pstate_attr_v0 attr = {
			.state = state,
			.index = 0,
		};

		ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_ATTR,
				&attr, sizeof(attr));
		if (ret)
			return ret;

		if (i < info.count)
			snappendf(buf, cnt, "%02x:", attr.state);
		else
			snappendf(buf, cnt, "%s:", info.pwrsrc == 0 ? "DC" :
						   info.pwrsrc == 1 ? "AC" :
						   "--");

		attr.index = 0;
		do {
			attr.state = state;
			ret = nvif_mthd(&sysfs->ctrl,
					NVIF_CONTROL_PSTATE_ATTR,
					&attr, sizeof(attr));
			if (ret)
				return ret;

			snappendf(buf, cnt, " %s %d", attr.name, attr.min);
			if (attr.min != attr.max)
				snappendf(buf, cnt, "-%d", attr.max);
			snappendf(buf, cnt, " %s", attr.unit);
		} while (attr.index);

		if (state >= 0) {
			if (info.ustate_ac == state)
				snappendf(buf, cnt, " AC");
			if (info.ustate_dc == state)
				snappendf(buf, cnt, " DC");
			if (info.pstate == state)
				snappendf(buf, cnt, " *");
		} else {
			if (info.ustate_ac < -1)
				snappendf(buf, cnt, " AC");
			if (info.ustate_dc < -1)
				snappendf(buf, cnt, " DC");
		}

		snappendf(buf, cnt, "\n");
	}

	return strlen(b);
}

static ssize_t
nouveau_sysfs_pstate_set(struct device *d, struct device_attribute *a,
			 const char *buf, size_t count)
{
	struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d));
	struct nvif_control_pstate_user_v0 args = { .pwrsrc = -EINVAL };
	long value, ret;
	char *tmp;

	if ((tmp = strchr(buf, '\n')))
		*tmp = '\0';

	if (!strncasecmp(buf, "dc:", 3)) {
		args.pwrsrc = 0;
		buf += 3;
	} else
	if (!strncasecmp(buf, "ac:", 3)) {
		args.pwrsrc = 1;
		buf += 3;
	}

	if (!strcasecmp(buf, "none"))
		args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_UNKNOWN;
	else
	if (!strcasecmp(buf, "auto"))
		args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_PERFMON;
	else {
		ret = kstrtol(buf, 16, &value);
		if (ret)
			return ret;
		args.ustate = value;
	}

	ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_USER,
			&args, sizeof(args));
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR(pstate, S_IRUGO | S_IWUSR,
		   nouveau_sysfs_pstate_get, nouveau_sysfs_pstate_set);

void
nouveau_sysfs_fini(struct drm_device *dev)
{
	struct nouveau_sysfs *sysfs = nouveau_sysfs(dev);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_device *device = &drm->device;

	if (sysfs && sysfs->ctrl.priv) {
		device_remove_file(nv_device_base(nvxx_device(device)), &dev_attr_pstate);
		nvif_object_fini(&sysfs->ctrl);
	}

	drm->sysfs = NULL;
	kfree(sysfs);
}

int
nouveau_sysfs_init(struct drm_device *dev)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_device *device = &drm->device;
	struct nouveau_sysfs *sysfs;
	int ret;

	if (!nouveau_pstate)
		return 0;

	sysfs = drm->sysfs = kzalloc(sizeof(*sysfs), GFP_KERNEL);
	if (!sysfs)
		return -ENOMEM;

	ret = nvif_object_init(nvif_object(device), NULL, NVDRM_CONTROL,
			       NVIF_IOCTL_NEW_V0_CONTROL, NULL, 0,
			      &sysfs->ctrl);
	if (ret == 0)
		device_create_file(nv_device_base(nvxx_device(device)), &dev_attr_pstate);

	return 0;
}