1 /*
2 * Copyright 2013 Red Hat Inc.
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 shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs <bskeggs@redhat.com>
23 */
24
25 #include <nvif/os.h>
26 #include <nvif/class.h>
27 #include <nvif/ioctl.h>
28
29 #include "nouveau_sysfs.h"
30
31 MODULE_PARM_DESC(pstate, "enable sysfs pstate file, which will be moved in the future");
32 int nouveau_pstate;
33 module_param_named(pstate, nouveau_pstate, int, 0400);
34
35 static inline struct drm_device *
drm_device(struct device * d)36 drm_device(struct device *d)
37 {
38 return dev_get_drvdata(d);
39 }
40
41 #define snappendf(p,r,f,a...) do { \
42 snprintf(p, r, f, ##a); \
43 r -= strlen(p); \
44 p += strlen(p); \
45 } while(0)
46
47 static ssize_t
nouveau_sysfs_pstate_get(struct device * d,struct device_attribute * a,char * b)48 nouveau_sysfs_pstate_get(struct device *d, struct device_attribute *a, char *b)
49 {
50 struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d));
51 struct nvif_control_pstate_info_v0 info = {};
52 size_t cnt = PAGE_SIZE;
53 char *buf = b;
54 int ret, i;
55
56 ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_INFO,
57 &info, sizeof(info));
58 if (ret)
59 return ret;
60
61 for (i = 0; i < info.count + 1; i++) {
62 const s32 state = i < info.count ? i :
63 NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT;
64 struct nvif_control_pstate_attr_v0 attr = {
65 .state = state,
66 .index = 0,
67 };
68
69 ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_ATTR,
70 &attr, sizeof(attr));
71 if (ret)
72 return ret;
73
74 if (i < info.count)
75 snappendf(buf, cnt, "%02x:", attr.state);
76 else
77 snappendf(buf, cnt, "%s:", info.pwrsrc == 0 ? "DC" :
78 info.pwrsrc == 1 ? "AC" :
79 "--");
80
81 attr.index = 0;
82 do {
83 attr.state = state;
84 ret = nvif_mthd(&sysfs->ctrl,
85 NVIF_CONTROL_PSTATE_ATTR,
86 &attr, sizeof(attr));
87 if (ret)
88 return ret;
89
90 snappendf(buf, cnt, " %s %d", attr.name, attr.min);
91 if (attr.min != attr.max)
92 snappendf(buf, cnt, "-%d", attr.max);
93 snappendf(buf, cnt, " %s", attr.unit);
94 } while (attr.index);
95
96 if (state >= 0) {
97 if (info.ustate_ac == state)
98 snappendf(buf, cnt, " AC");
99 if (info.ustate_dc == state)
100 snappendf(buf, cnt, " DC");
101 if (info.pstate == state)
102 snappendf(buf, cnt, " *");
103 } else {
104 if (info.ustate_ac < -1)
105 snappendf(buf, cnt, " AC");
106 if (info.ustate_dc < -1)
107 snappendf(buf, cnt, " DC");
108 }
109
110 snappendf(buf, cnt, "\n");
111 }
112
113 return strlen(b);
114 }
115
116 static ssize_t
nouveau_sysfs_pstate_set(struct device * d,struct device_attribute * a,const char * buf,size_t count)117 nouveau_sysfs_pstate_set(struct device *d, struct device_attribute *a,
118 const char *buf, size_t count)
119 {
120 struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d));
121 struct nvif_control_pstate_user_v0 args = { .pwrsrc = -EINVAL };
122 long value, ret;
123 char *tmp;
124
125 if ((tmp = strchr(buf, '\n')))
126 *tmp = '\0';
127
128 if (!strncasecmp(buf, "dc:", 3)) {
129 args.pwrsrc = 0;
130 buf += 3;
131 } else
132 if (!strncasecmp(buf, "ac:", 3)) {
133 args.pwrsrc = 1;
134 buf += 3;
135 }
136
137 if (!strcasecmp(buf, "none"))
138 args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_UNKNOWN;
139 else
140 if (!strcasecmp(buf, "auto"))
141 args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_PERFMON;
142 else {
143 ret = kstrtol(buf, 16, &value);
144 if (ret)
145 return ret;
146 args.ustate = value;
147 }
148
149 ret = nvif_mthd(&sysfs->ctrl, NVIF_CONTROL_PSTATE_USER,
150 &args, sizeof(args));
151 if (ret < 0)
152 return ret;
153
154 return count;
155 }
156
157 static DEVICE_ATTR(pstate, S_IRUGO | S_IWUSR,
158 nouveau_sysfs_pstate_get, nouveau_sysfs_pstate_set);
159
160 void
nouveau_sysfs_fini(struct drm_device * dev)161 nouveau_sysfs_fini(struct drm_device *dev)
162 {
163 struct nouveau_sysfs *sysfs = nouveau_sysfs(dev);
164 struct nouveau_drm *drm = nouveau_drm(dev);
165 struct nvif_device *device = &drm->device;
166
167 if (sysfs && sysfs->ctrl.priv) {
168 device_remove_file(nvxx_device(device)->dev, &dev_attr_pstate);
169 nvif_object_fini(&sysfs->ctrl);
170 }
171
172 drm->sysfs = NULL;
173 kfree(sysfs);
174 }
175
176 int
nouveau_sysfs_init(struct drm_device * dev)177 nouveau_sysfs_init(struct drm_device *dev)
178 {
179 struct nouveau_drm *drm = nouveau_drm(dev);
180 struct nvif_device *device = &drm->device;
181 struct nouveau_sysfs *sysfs;
182 int ret;
183
184 if (!nouveau_pstate)
185 return 0;
186
187 sysfs = drm->sysfs = kzalloc(sizeof(*sysfs), GFP_KERNEL);
188 if (!sysfs)
189 return -ENOMEM;
190
191 ret = nvif_object_init(&device->object, 0, NVIF_IOCTL_NEW_V0_CONTROL,
192 NULL, 0, &sysfs->ctrl);
193 if (ret == 0)
194 device_create_file(nvxx_device(device)->dev, &dev_attr_pstate);
195
196 return 0;
197 }
198