1 /*
2  * Copyright (C) 2009 Red Hat <bskeggs@redhat.com>
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining
5  * a copy of this software and associated documentation files (the
6  * "Software"), to deal in the Software without restriction, including
7  * without limitation the rights to use, copy, modify, merge, publish,
8  * distribute, sublicense, and/or sell copies of the Software, and to
9  * permit persons to whom the Software is furnished to do so, subject to
10  * the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the
13  * next paragraph) shall be included in all copies or substantial
14  * portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23  *
24  */
25 
26 /*
27  * Authors:
28  *  Ben Skeggs <bskeggs@redhat.com>
29  */
30 
31 #include <linux/debugfs.h>
32 #include <nvif/class.h>
33 #include <nvif/if0001.h>
34 #include "nouveau_debugfs.h"
35 #include "nouveau_drv.h"
36 
37 static int
38 nouveau_debugfs_vbios_image(struct seq_file *m, void *data)
39 {
40 	struct drm_info_node *node = (struct drm_info_node *) m->private;
41 	struct nouveau_drm *drm = nouveau_drm(node->minor->dev);
42 	int i;
43 
44 	for (i = 0; i < drm->vbios.length; i++)
45 		seq_printf(m, "%c", drm->vbios.data[i]);
46 	return 0;
47 }
48 
49 static int
50 nouveau_debugfs_strap_peek(struct seq_file *m, void *data)
51 {
52 	struct drm_info_node *node = m->private;
53 	struct nouveau_drm *drm = nouveau_drm(node->minor->dev);
54 	int ret;
55 
56 	ret = pm_runtime_get_sync(drm->dev->dev);
57 	if (ret < 0 && ret != -EACCES) {
58 		pm_runtime_put_autosuspend(drm->dev->dev);
59 		return ret;
60 	}
61 
62 	seq_printf(m, "0x%08x\n",
63 		   nvif_rd32(&drm->client.device.object, 0x101000));
64 
65 	pm_runtime_mark_last_busy(drm->dev->dev);
66 	pm_runtime_put_autosuspend(drm->dev->dev);
67 
68 	return 0;
69 }
70 
71 static int
72 nouveau_debugfs_pstate_get(struct seq_file *m, void *data)
73 {
74 	struct drm_device *drm = m->private;
75 	struct nouveau_debugfs *debugfs = nouveau_debugfs(drm);
76 	struct nvif_object *ctrl = &debugfs->ctrl;
77 	struct nvif_control_pstate_info_v0 info = {};
78 	int ret, i;
79 
80 	if (!debugfs)
81 		return -ENODEV;
82 
83 	ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_INFO, &info, sizeof(info));
84 	if (ret)
85 		return ret;
86 
87 	for (i = 0; i < info.count + 1; i++) {
88 		const s32 state = i < info.count ? i :
89 			NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT;
90 		struct nvif_control_pstate_attr_v0 attr = {
91 			.state = state,
92 			.index = 0,
93 		};
94 
95 		ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_ATTR,
96 				&attr, sizeof(attr));
97 		if (ret)
98 			return ret;
99 
100 		if (i < info.count)
101 			seq_printf(m, "%02x:", attr.state);
102 		else
103 			seq_printf(m, "%s:", info.pwrsrc == 0 ? "DC" :
104 					     info.pwrsrc == 1 ? "AC" : "--");
105 
106 		attr.index = 0;
107 		do {
108 			attr.state = state;
109 			ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_ATTR,
110 					&attr, sizeof(attr));
111 			if (ret)
112 				return ret;
113 
114 			seq_printf(m, " %s %d", attr.name, attr.min);
115 			if (attr.min != attr.max)
116 				seq_printf(m, "-%d", attr.max);
117 			seq_printf(m, " %s", attr.unit);
118 		} while (attr.index);
119 
120 		if (state >= 0) {
121 			if (info.ustate_ac == state)
122 				seq_printf(m, " AC");
123 			if (info.ustate_dc == state)
124 				seq_printf(m, " DC");
125 			if (info.pstate == state)
126 				seq_printf(m, " *");
127 		} else {
128 			if (info.ustate_ac < -1)
129 				seq_printf(m, " AC");
130 			if (info.ustate_dc < -1)
131 				seq_printf(m, " DC");
132 		}
133 
134 		seq_printf(m, "\n");
135 	}
136 
137 	return 0;
138 }
139 
140 static ssize_t
141 nouveau_debugfs_pstate_set(struct file *file, const char __user *ubuf,
142 			   size_t len, loff_t *offp)
143 {
144 	struct seq_file *m = file->private_data;
145 	struct drm_device *drm = m->private;
146 	struct nouveau_debugfs *debugfs = nouveau_debugfs(drm);
147 	struct nvif_object *ctrl = &debugfs->ctrl;
148 	struct nvif_control_pstate_user_v0 args = { .pwrsrc = -EINVAL };
149 	char buf[32] = {}, *tmp, *cur = buf;
150 	long value, ret;
151 
152 	if (!debugfs)
153 		return -ENODEV;
154 
155 	if (len >= sizeof(buf))
156 		return -EINVAL;
157 
158 	if (copy_from_user(buf, ubuf, len))
159 		return -EFAULT;
160 
161 	if ((tmp = strchr(buf, '\n')))
162 		*tmp = '\0';
163 
164 	if (!strncasecmp(cur, "dc:", 3)) {
165 		args.pwrsrc = 0;
166 		cur += 3;
167 	} else
168 	if (!strncasecmp(cur, "ac:", 3)) {
169 		args.pwrsrc = 1;
170 		cur += 3;
171 	}
172 
173 	if (!strcasecmp(cur, "none"))
174 		args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_UNKNOWN;
175 	else
176 	if (!strcasecmp(cur, "auto"))
177 		args.ustate = NVIF_CONTROL_PSTATE_USER_V0_STATE_PERFMON;
178 	else {
179 		ret = kstrtol(cur, 16, &value);
180 		if (ret)
181 			return ret;
182 		args.ustate = value;
183 	}
184 
185 	ret = pm_runtime_get_sync(drm->dev);
186 	if (ret < 0 && ret != -EACCES) {
187 		pm_runtime_put_autosuspend(drm->dev);
188 		return ret;
189 	}
190 
191 	ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_USER, &args, sizeof(args));
192 	pm_runtime_put_autosuspend(drm->dev);
193 	if (ret < 0)
194 		return ret;
195 
196 	return len;
197 }
198 
199 static int
200 nouveau_debugfs_pstate_open(struct inode *inode, struct file *file)
201 {
202 	return single_open(file, nouveau_debugfs_pstate_get, inode->i_private);
203 }
204 
205 static const struct file_operations nouveau_pstate_fops = {
206 	.owner = THIS_MODULE,
207 	.open = nouveau_debugfs_pstate_open,
208 	.read = seq_read,
209 	.write = nouveau_debugfs_pstate_set,
210 	.release = single_release,
211 };
212 
213 static struct drm_info_list nouveau_debugfs_list[] = {
214 	{ "vbios.rom",  nouveau_debugfs_vbios_image, 0, NULL },
215 	{ "strap_peek", nouveau_debugfs_strap_peek, 0, NULL },
216 };
217 #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)
218 
219 static const struct nouveau_debugfs_files {
220 	const char *name;
221 	const struct file_operations *fops;
222 } nouveau_debugfs_files[] = {
223 	{"pstate", &nouveau_pstate_fops},
224 };
225 
226 void
227 nouveau_drm_debugfs_init(struct drm_minor *minor)
228 {
229 	struct nouveau_drm *drm = nouveau_drm(minor->dev);
230 	struct dentry *dentry;
231 	int i;
232 
233 	for (i = 0; i < ARRAY_SIZE(nouveau_debugfs_files); i++) {
234 		debugfs_create_file(nouveau_debugfs_files[i].name,
235 				    S_IRUGO | S_IWUSR,
236 				    minor->debugfs_root, minor->dev,
237 				    nouveau_debugfs_files[i].fops);
238 	}
239 
240 	drm_debugfs_create_files(nouveau_debugfs_list,
241 				 NOUVEAU_DEBUGFS_ENTRIES,
242 				 minor->debugfs_root, minor);
243 
244 	/* Set the size of the vbios since we know it, and it's confusing to
245 	 * userspace if it wants to seek() but the file has a length of 0
246 	 */
247 	dentry = debugfs_lookup("vbios.rom", minor->debugfs_root);
248 	if (!dentry)
249 		return;
250 
251 	d_inode(dentry)->i_size = drm->vbios.length;
252 	dput(dentry);
253 }
254 
255 int
256 nouveau_debugfs_init(struct nouveau_drm *drm)
257 {
258 	drm->debugfs = kzalloc(sizeof(*drm->debugfs), GFP_KERNEL);
259 	if (!drm->debugfs)
260 		return -ENOMEM;
261 
262 	return nvif_object_ctor(&drm->client.device.object, "debugfsCtrl", 0,
263 				NVIF_CLASS_CONTROL, NULL, 0,
264 				&drm->debugfs->ctrl);
265 }
266 
267 void
268 nouveau_debugfs_fini(struct nouveau_drm *drm)
269 {
270 	if (drm->debugfs && drm->debugfs->ctrl.priv)
271 		nvif_object_dtor(&drm->debugfs->ctrl);
272 
273 	kfree(drm->debugfs);
274 	drm->debugfs = NULL;
275 }
276