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;
77 	struct nvif_control_pstate_info_v0 info = {};
78 	int ret, i;
79 
80 	if (!debugfs)
81 		return -ENODEV;
82 
83 	ctrl = &debugfs->ctrl;
84 	ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_INFO, &info, sizeof(info));
85 	if (ret)
86 		return ret;
87 
88 	for (i = 0; i < info.count + 1; i++) {
89 		const s32 state = i < info.count ? i :
90 			NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT;
91 		struct nvif_control_pstate_attr_v0 attr = {
92 			.state = state,
93 			.index = 0,
94 		};
95 
96 		ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_ATTR,
97 				&attr, sizeof(attr));
98 		if (ret)
99 			return ret;
100 
101 		if (i < info.count)
102 			seq_printf(m, "%02x:", attr.state);
103 		else
104 			seq_printf(m, "%s:", info.pwrsrc == 0 ? "DC" :
105 					     info.pwrsrc == 1 ? "AC" : "--");
106 
107 		attr.index = 0;
108 		do {
109 			attr.state = state;
110 			ret = nvif_mthd(ctrl, NVIF_CONTROL_PSTATE_ATTR,
111 					&attr, sizeof(attr));
112 			if (ret)
113 				return ret;
114 
115 			seq_printf(m, " %s %d", attr.name, attr.min);
116 			if (attr.min != attr.max)
117 				seq_printf(m, "-%d", attr.max);
118 			seq_printf(m, " %s", attr.unit);
119 		} while (attr.index);
120 
121 		if (state >= 0) {
122 			if (info.ustate_ac == state)
123 				seq_puts(m, " AC");
124 			if (info.ustate_dc == state)
125 				seq_puts(m, " DC");
126 			if (info.pstate == state)
127 				seq_puts(m, " *");
128 		} else {
129 			if (info.ustate_ac < -1)
130 				seq_puts(m, " AC");
131 			if (info.ustate_dc < -1)
132 				seq_puts(m, " DC");
133 		}
134 
135 		seq_putc(m, '\n');
136 	}
137 
138 	return 0;
139 }
140 
141 static ssize_t
142 nouveau_debugfs_pstate_set(struct file *file, const char __user *ubuf,
143 			   size_t len, loff_t *offp)
144 {
145 	struct seq_file *m = file->private_data;
146 	struct drm_device *drm = m->private;
147 	struct nouveau_debugfs *debugfs = nouveau_debugfs(drm);
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(&debugfs->ctrl, NVIF_CONTROL_PSTATE_USER,
192 			&args, sizeof(args));
193 	pm_runtime_put_autosuspend(drm->dev);
194 	if (ret < 0)
195 		return ret;
196 
197 	return len;
198 }
199 
200 static int
201 nouveau_debugfs_pstate_open(struct inode *inode, struct file *file)
202 {
203 	return single_open(file, nouveau_debugfs_pstate_get, inode->i_private);
204 }
205 
206 static const struct file_operations nouveau_pstate_fops = {
207 	.owner = THIS_MODULE,
208 	.open = nouveau_debugfs_pstate_open,
209 	.read = seq_read,
210 	.write = nouveau_debugfs_pstate_set,
211 	.release = single_release,
212 };
213 
214 static struct drm_info_list nouveau_debugfs_list[] = {
215 	{ "vbios.rom",  nouveau_debugfs_vbios_image, 0, NULL },
216 	{ "strap_peek", nouveau_debugfs_strap_peek, 0, NULL },
217 };
218 #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)
219 
220 static const struct nouveau_debugfs_files {
221 	const char *name;
222 	const struct file_operations *fops;
223 } nouveau_debugfs_files[] = {
224 	{"pstate", &nouveau_pstate_fops},
225 };
226 
227 void
228 nouveau_drm_debugfs_init(struct drm_minor *minor)
229 {
230 	struct nouveau_drm *drm = nouveau_drm(minor->dev);
231 	struct dentry *dentry;
232 	int i;
233 
234 	for (i = 0; i < ARRAY_SIZE(nouveau_debugfs_files); i++) {
235 		debugfs_create_file(nouveau_debugfs_files[i].name,
236 				    S_IRUGO | S_IWUSR,
237 				    minor->debugfs_root, minor->dev,
238 				    nouveau_debugfs_files[i].fops);
239 	}
240 
241 	drm_debugfs_create_files(nouveau_debugfs_list,
242 				 NOUVEAU_DEBUGFS_ENTRIES,
243 				 minor->debugfs_root, minor);
244 
245 	/* Set the size of the vbios since we know it, and it's confusing to
246 	 * userspace if it wants to seek() but the file has a length of 0
247 	 */
248 	dentry = debugfs_lookup("vbios.rom", minor->debugfs_root);
249 	if (!dentry)
250 		return;
251 
252 	d_inode(dentry)->i_size = drm->vbios.length;
253 	dput(dentry);
254 }
255 
256 int
257 nouveau_debugfs_init(struct nouveau_drm *drm)
258 {
259 	drm->debugfs = kzalloc(sizeof(*drm->debugfs), GFP_KERNEL);
260 	if (!drm->debugfs)
261 		return -ENOMEM;
262 
263 	return nvif_object_ctor(&drm->client.device.object, "debugfsCtrl", 0,
264 				NVIF_CLASS_CONTROL, NULL, 0,
265 				&drm->debugfs->ctrl);
266 }
267 
268 void
269 nouveau_debugfs_fini(struct nouveau_drm *drm)
270 {
271 	if (drm->debugfs && drm->debugfs->ctrl.priv)
272 		nvif_object_dtor(&drm->debugfs->ctrl);
273 
274 	kfree(drm->debugfs);
275 	drm->debugfs = NULL;
276 }
277