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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 "nouveau_sysfs.h" | |
26 | ||
27 | #include <core/object.h> | |
28 | #include <core/class.h> | |
29 | ||
30 | static inline struct drm_device * | |
31 | drm_device(struct device *d) | |
32 | { | |
420b9469 | 33 | return dev_get_drvdata(d); |
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34 | } |
35 | ||
36 | #define snappendf(p,r,f,a...) do { \ | |
37 | snprintf(p, r, f, ##a); \ | |
38 | r -= strlen(p); \ | |
39 | p += strlen(p); \ | |
40 | } while(0) | |
41 | ||
42 | static ssize_t | |
43 | nouveau_sysfs_pstate_get(struct device *d, struct device_attribute *a, char *b) | |
44 | { | |
45 | struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d)); | |
46 | struct nv_control_pstate_info info; | |
47 | size_t cnt = PAGE_SIZE; | |
48 | char *buf = b; | |
49 | int ret, i; | |
50 | ||
51 | ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_INFO, &info, sizeof(info)); | |
52 | if (ret) | |
53 | return ret; | |
54 | ||
55 | for (i = 0; i < info.count + 1; i++) { | |
56 | const s32 state = i < info.count ? i : | |
57 | NV_CONTROL_PSTATE_ATTR_STATE_CURRENT; | |
58 | struct nv_control_pstate_attr attr = { | |
59 | .state = state, | |
60 | .index = 0, | |
61 | }; | |
62 | ||
63 | ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_ATTR, | |
64 | &attr, sizeof(attr)); | |
65 | if (ret) | |
66 | return ret; | |
67 | ||
68 | if (i < info.count) | |
69 | snappendf(buf, cnt, "%02x:", attr.state); | |
70 | else | |
71 | snappendf(buf, cnt, "--:"); | |
72 | ||
73 | attr.index = 0; | |
74 | do { | |
75 | attr.state = state; | |
76 | ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_ATTR, | |
77 | &attr, sizeof(attr)); | |
78 | if (ret) | |
79 | return ret; | |
80 | ||
81 | snappendf(buf, cnt, " %s %d", attr.name, attr.min); | |
82 | if (attr.min != attr.max) | |
83 | snappendf(buf, cnt, "-%d", attr.max); | |
84 | snappendf(buf, cnt, " %s", attr.unit); | |
85 | } while (attr.index); | |
86 | ||
87 | if ((state >= 0 && info.pstate == state) || | |
88 | (state < 0 && info.ustate < 0)) | |
89 | snappendf(buf, cnt, " *"); | |
90 | snappendf(buf, cnt, "\n"); | |
91 | } | |
92 | ||
93 | return strlen(b); | |
94 | } | |
95 | ||
96 | static ssize_t | |
97 | nouveau_sysfs_pstate_set(struct device *d, struct device_attribute *a, | |
98 | const char *buf, size_t count) | |
99 | { | |
100 | struct nouveau_sysfs *sysfs = nouveau_sysfs(drm_device(d)); | |
101 | struct nv_control_pstate_user args; | |
102 | long value, ret; | |
103 | char *tmp; | |
104 | ||
105 | if ((tmp = strchr(buf, '\n'))) | |
106 | *tmp = '\0'; | |
107 | ||
108 | if (!strcasecmp(buf, "none")) | |
109 | args.state = NV_CONTROL_PSTATE_USER_STATE_UNKNOWN; | |
110 | else | |
111 | if (!strcasecmp(buf, "auto")) | |
112 | args.state = NV_CONTROL_PSTATE_USER_STATE_PERFMON; | |
113 | else { | |
114 | ret = kstrtol(buf, 16, &value); | |
115 | if (ret) | |
116 | return ret; | |
117 | args.state = value; | |
118 | } | |
119 | ||
120 | ret = nv_exec(sysfs->ctrl, NV_CONTROL_PSTATE_USER, &args, sizeof(args)); | |
121 | if (ret < 0) | |
122 | return ret; | |
123 | ||
124 | return count; | |
125 | } | |
126 | ||
127 | static DEVICE_ATTR(pstate, S_IRUGO | S_IWUSR, | |
128 | nouveau_sysfs_pstate_get, nouveau_sysfs_pstate_set); | |
129 | ||
130 | void | |
131 | nouveau_sysfs_fini(struct drm_device *dev) | |
132 | { | |
133 | struct nouveau_sysfs *sysfs = nouveau_sysfs(dev); | |
134 | struct nouveau_drm *drm = nouveau_drm(dev); | |
420b9469 | 135 | struct nouveau_device *device = nv_device(drm->device); |
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136 | |
137 | if (sysfs->ctrl) { | |
420b9469 | 138 | device_remove_file(nv_device_base(device), &dev_attr_pstate); |
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139 | nouveau_object_del(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL); |
140 | } | |
141 | ||
142 | drm->sysfs = NULL; | |
143 | kfree(sysfs); | |
144 | } | |
145 | ||
146 | int | |
147 | nouveau_sysfs_init(struct drm_device *dev) | |
148 | { | |
149 | struct nouveau_drm *drm = nouveau_drm(dev); | |
420b9469 | 150 | struct nouveau_device *device = nv_device(drm->device); |
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151 | struct nouveau_sysfs *sysfs; |
152 | int ret; | |
153 | ||
154 | sysfs = drm->sysfs = kzalloc(sizeof(*sysfs), GFP_KERNEL); | |
155 | if (!sysfs) | |
156 | return -ENOMEM; | |
157 | ||
158 | ret = nouveau_object_new(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL, | |
159 | NV_CONTROL_CLASS, NULL, 0, &sysfs->ctrl); | |
160 | if (ret == 0) | |
420b9469 | 161 | device_create_file(nv_device_base(device), &dev_attr_pstate); |
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162 | |
163 | return 0; | |
164 | } |