Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2012-2016, Intel Corporation. All rights reserved
4 * Intel Management Engine Interface (Intel MEI) Linux driver
5 */
6
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <linux/device.h>
10#include <linux/debugfs.h>
11
12#include <linux/mei.h>
13
14#include "mei_dev.h"
15#include "client.h"
16#include "hw.h"
17
18static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
19 size_t cnt, loff_t *ppos)
20{
21 struct mei_device *dev = fp->private_data;
22 struct mei_me_client *me_cl;
23 size_t bufsz = 1;
24 char *buf;
25 int i = 0;
26 int pos = 0;
27 int ret;
28
29#define HDR \
30" |id|fix| UUID |con|msg len|sb|refc|\n"
31
32 down_read(&dev->me_clients_rwsem);
33 list_for_each_entry(me_cl, &dev->me_clients, list)
34 bufsz++;
35
36 bufsz *= sizeof(HDR) + 1;
37 buf = kzalloc(bufsz, GFP_KERNEL);
38 if (!buf) {
39 up_read(&dev->me_clients_rwsem);
40 return -ENOMEM;
41 }
42
43 pos += scnprintf(buf + pos, bufsz - pos, HDR);
44#undef HDR
45
46 /* if the driver is not enabled the list won't be consistent */
47 if (dev->dev_state != MEI_DEV_ENABLED)
48 goto out;
49
50 list_for_each_entry(me_cl, &dev->me_clients, list) {
51
52 if (mei_me_cl_get(me_cl)) {
53 pos += scnprintf(buf + pos, bufsz - pos,
54 "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
55 i++, me_cl->client_id,
56 me_cl->props.fixed_address,
57 &me_cl->props.protocol_name,
58 me_cl->props.max_number_of_connections,
59 me_cl->props.max_msg_length,
60 me_cl->props.single_recv_buf,
61 kref_read(&me_cl->refcnt));
62
63 mei_me_cl_put(me_cl);
64 }
65 }
66
67out:
68 up_read(&dev->me_clients_rwsem);
69 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
70 kfree(buf);
71 return ret;
72}
73
74static const struct file_operations mei_dbgfs_fops_meclients = {
75 .open = simple_open,
76 .read = mei_dbgfs_read_meclients,
77 .llseek = generic_file_llseek,
78};
79
80static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
81 size_t cnt, loff_t *ppos)
82{
83 struct mei_device *dev = fp->private_data;
84 struct mei_cl *cl;
85 size_t bufsz = 1;
86 char *buf;
87 int i = 0;
88 int pos = 0;
89 int ret;
90
91#define HDR " |me|host|state|rd|wr|wrq\n"
92
93 if (!dev)
94 return -ENODEV;
95
96 mutex_lock(&dev->device_lock);
97
98 /*
99 * if the driver is not enabled the list won't be consistent,
100 * we output empty table
101 */
102 if (dev->dev_state == MEI_DEV_ENABLED)
103 list_for_each_entry(cl, &dev->file_list, link)
104 bufsz++;
105
106 bufsz *= sizeof(HDR) + 1;
107
108 buf = kzalloc(bufsz, GFP_KERNEL);
109 if (!buf) {
110 mutex_unlock(&dev->device_lock);
111 return -ENOMEM;
112 }
113
114 pos += scnprintf(buf + pos, bufsz - pos, HDR);
115#undef HDR
116
117 /* if the driver is not enabled the list won't be consistent */
118 if (dev->dev_state != MEI_DEV_ENABLED)
119 goto out;
120
121 list_for_each_entry(cl, &dev->file_list, link) {
122
123 pos += scnprintf(buf + pos, bufsz - pos,
124 "%3d|%2d|%4d|%5d|%2d|%2d|%3u\n",
125 i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
126 !list_empty(&cl->rd_completed), cl->writing_state,
127 cl->tx_cb_queued);
128 i++;
129 }
130out:
131 mutex_unlock(&dev->device_lock);
132 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
133 kfree(buf);
134 return ret;
135}
136
137static const struct file_operations mei_dbgfs_fops_active = {
138 .open = simple_open,
139 .read = mei_dbgfs_read_active,
140 .llseek = generic_file_llseek,
141};
142
143static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
144 size_t cnt, loff_t *ppos)
145{
146 struct mei_device *dev = fp->private_data;
147 const size_t bufsz = 1024;
148 char *buf = kzalloc(bufsz, GFP_KERNEL);
149 int pos = 0;
150 int ret;
151
152 if (!buf)
153 return -ENOMEM;
154
155 pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n",
156 mei_dev_state_str(dev->dev_state));
157 pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n",
158 mei_hbm_state_str(dev->hbm_state));
159
160 if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS &&
161 dev->hbm_state <= MEI_HBM_STARTED) {
162 pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n");
163 pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n",
164 dev->hbm_f_pg_supported);
165 pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n",
166 dev->hbm_f_dc_supported);
167 pos += scnprintf(buf + pos, bufsz - pos, "\tIE: %01d\n",
168 dev->hbm_f_ie_supported);
169 pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n",
170 dev->hbm_f_dot_supported);
171 pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n",
172 dev->hbm_f_ev_supported);
173 pos += scnprintf(buf + pos, bufsz - pos, "\tFA: %01d\n",
174 dev->hbm_f_fa_supported);
175 pos += scnprintf(buf + pos, bufsz - pos, "\tOS: %01d\n",
176 dev->hbm_f_os_supported);
177 pos += scnprintf(buf + pos, bufsz - pos, "\tDR: %01d\n",
178 dev->hbm_f_dr_supported);
179 }
180
181 pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n",
182 mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
183 mei_pg_state_str(mei_pg_state(dev)));
184 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
185 kfree(buf);
186 return ret;
187}
188static const struct file_operations mei_dbgfs_fops_devstate = {
189 .open = simple_open,
190 .read = mei_dbgfs_read_devstate,
191 .llseek = generic_file_llseek,
192};
193
194static ssize_t mei_dbgfs_write_allow_fa(struct file *file,
195 const char __user *user_buf,
196 size_t count, loff_t *ppos)
197{
198 struct mei_device *dev;
199 int ret;
200
201 dev = container_of(file->private_data,
202 struct mei_device, allow_fixed_address);
203
204 ret = debugfs_write_file_bool(file, user_buf, count, ppos);
205 if (ret < 0)
206 return ret;
207 dev->override_fixed_address = true;
208 return ret;
209}
210
211static const struct file_operations mei_dbgfs_fops_allow_fa = {
212 .open = simple_open,
213 .read = debugfs_read_file_bool,
214 .write = mei_dbgfs_write_allow_fa,
215 .llseek = generic_file_llseek,
216};
217
218/**
219 * mei_dbgfs_deregister - Remove the debugfs files and directories
220 *
221 * @dev: the mei device structure
222 */
223void mei_dbgfs_deregister(struct mei_device *dev)
224{
225 if (!dev->dbgfs_dir)
226 return;
227 debugfs_remove_recursive(dev->dbgfs_dir);
228 dev->dbgfs_dir = NULL;
229}
230
231/**
232 * mei_dbgfs_register - Add the debugfs files
233 *
234 * @dev: the mei device structure
235 * @name: the mei device name
236 *
237 * Return: 0 on success, <0 on failure.
238 */
239int mei_dbgfs_register(struct mei_device *dev, const char *name)
240{
241 struct dentry *dir, *f;
242
243 dir = debugfs_create_dir(name, NULL);
244 if (!dir)
245 return -ENOMEM;
246
247 dev->dbgfs_dir = dir;
248
249 f = debugfs_create_file("meclients", S_IRUSR, dir,
250 dev, &mei_dbgfs_fops_meclients);
251 if (!f) {
252 dev_err(dev->dev, "meclients: registration failed\n");
253 goto err;
254 }
255 f = debugfs_create_file("active", S_IRUSR, dir,
256 dev, &mei_dbgfs_fops_active);
257 if (!f) {
258 dev_err(dev->dev, "active: registration failed\n");
259 goto err;
260 }
261 f = debugfs_create_file("devstate", S_IRUSR, dir,
262 dev, &mei_dbgfs_fops_devstate);
263 if (!f) {
264 dev_err(dev->dev, "devstate: registration failed\n");
265 goto err;
266 }
267 f = debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
268 &dev->allow_fixed_address,
269 &mei_dbgfs_fops_allow_fa);
270 if (!f) {
271 dev_err(dev->dev, "allow_fixed_address: registration failed\n");
272 goto err;
273 }
274 return 0;
275err:
276 mei_dbgfs_deregister(dev);
277 return -ENODEV;
278}
279