Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
/*
 * Ultra Wide Band
 * Debug support
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * FIXME: doc
 */

#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/seq_file.h>

#include <linux/uwb/debug-cmd.h>

#include "uwb-internal.h"

/*
 * Debug interface
 *
 * Per radio controller debugfs files (in uwb/uwbN/):
 *
 * command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
 *
 * reservations: information on reservations.
 *
 * accept: Set to true (Y or 1) to accept reservation requests from
 * peers.
 *
 * drp_avail: DRP availability information.
 */

struct uwb_dbg {
	struct uwb_pal pal;

	u32 accept;
	struct list_head rsvs;

	struct dentry *root_d;
	struct dentry *command_f;
	struct dentry *reservations_f;
	struct dentry *accept_f;
	struct dentry *drp_avail_f;
	spinlock_t list_lock;
};

static struct dentry *root_dir;

static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
{
	struct uwb_dbg *dbg = rsv->pal_priv;

	uwb_rsv_dump("debug", rsv);

	if (rsv->state == UWB_RSV_STATE_NONE) {
		spin_lock(&dbg->list_lock);
		list_del(&rsv->pal_node);
		spin_unlock(&dbg->list_lock);
		uwb_rsv_destroy(rsv);
	}
}

static int cmd_rsv_establish(struct uwb_rc *rc,
			     struct uwb_dbg_cmd_rsv_establish *cmd)
{
	struct uwb_mac_addr macaddr;
	struct uwb_rsv *rsv;
	struct uwb_dev *target;
	int ret;

	memcpy(&macaddr, cmd->target, sizeof(macaddr));
	target = uwb_dev_get_by_macaddr(rc, &macaddr);
	if (target == NULL)
		return -ENODEV;

	rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
	if (rsv == NULL) {
		uwb_dev_put(target);
		return -ENOMEM;
	}

	rsv->target.type  = UWB_RSV_TARGET_DEV;
	rsv->target.dev   = target;
	rsv->type         = cmd->type;
	rsv->max_mas      = cmd->max_mas;
	rsv->min_mas      = cmd->min_mas;
	rsv->max_interval = cmd->max_interval;

	ret = uwb_rsv_establish(rsv);
	if (ret)
		uwb_rsv_destroy(rsv);
	else {
		spin_lock(&(rc->dbg)->list_lock);
		list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
		spin_unlock(&(rc->dbg)->list_lock);
	}
	return ret;
}

static int cmd_rsv_terminate(struct uwb_rc *rc,
			     struct uwb_dbg_cmd_rsv_terminate *cmd)
{
	struct uwb_rsv *rsv, *found = NULL;
	int i = 0;

	spin_lock(&(rc->dbg)->list_lock);

	list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
		if (i == cmd->index) {
			found = rsv;
			uwb_rsv_get(found);
			break;
		}
		i++;
	}

	spin_unlock(&(rc->dbg)->list_lock);

	if (!found)
		return -EINVAL;

	uwb_rsv_terminate(found);
	uwb_rsv_put(found);

	return 0;
}

static int cmd_ie_add(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_add)
{
	return uwb_rc_ie_add(rc,
			     (const struct uwb_ie_hdr *) ie_to_add->data,
			     ie_to_add->len);
}

static int cmd_ie_rm(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_rm)
{
	return uwb_rc_ie_rm(rc, ie_to_rm->data[0]);
}

static int command_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;

	return 0;
}

static ssize_t command_write(struct file *file, const char __user *buf,
			 size_t len, loff_t *off)
{
	struct uwb_rc *rc = file->private_data;
	struct uwb_dbg_cmd cmd;
	int ret = 0;
	
	if (len != sizeof(struct uwb_dbg_cmd))
		return -EINVAL;

	if (copy_from_user(&cmd, buf, len) != 0)
		return -EFAULT;

	switch (cmd.type) {
	case UWB_DBG_CMD_RSV_ESTABLISH:
		ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
		break;
	case UWB_DBG_CMD_RSV_TERMINATE:
		ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
		break;
	case UWB_DBG_CMD_IE_ADD:
		ret = cmd_ie_add(rc, &cmd.ie_add);
		break;
	case UWB_DBG_CMD_IE_RM:
		ret = cmd_ie_rm(rc, &cmd.ie_rm);
		break;
	case UWB_DBG_CMD_RADIO_START:
		ret = uwb_radio_start(&rc->dbg->pal);
		break;
	case UWB_DBG_CMD_RADIO_STOP:
		uwb_radio_stop(&rc->dbg->pal);
		break;
	default:
		return -EINVAL;
	}

	return ret < 0 ? ret : len;
}

static const struct file_operations command_fops = {
	.open   = command_open,
	.write  = command_write,
	.read   = NULL,
	.llseek = no_llseek,
	.owner  = THIS_MODULE,
};

static int reservations_print(struct seq_file *s, void *p)
{
	struct uwb_rc *rc = s->private;
	struct uwb_rsv *rsv;

	mutex_lock(&rc->rsvs_mutex);

	list_for_each_entry(rsv, &rc->reservations, rc_node) {
		struct uwb_dev_addr devaddr;
		char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
		bool is_owner;
		char buf[72];

		uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
		if (rsv->target.type == UWB_RSV_TARGET_DEV) {
			devaddr = rsv->target.dev->dev_addr;
			is_owner = &rc->uwb_dev == rsv->owner;
		} else {
			devaddr = rsv->target.devaddr;
			is_owner = true;
		}
		uwb_dev_addr_print(target, sizeof(target), &devaddr);

		seq_printf(s, "%c %s -> %s: %s\n",
			   is_owner ? 'O' : 'T',
			   owner, target, uwb_rsv_state_str(rsv->state));
		seq_printf(s, "  stream: %d  type: %s\n",
			   rsv->stream, uwb_rsv_type_str(rsv->type));
		bitmap_scnprintf(buf, sizeof(buf), rsv->mas.bm, UWB_NUM_MAS);
		seq_printf(s, "  %s\n", buf);
	}

	mutex_unlock(&rc->rsvs_mutex);

	return 0;
}

static int reservations_open(struct inode *inode, struct file *file)
{
	return single_open(file, reservations_print, inode->i_private);
}

static const struct file_operations reservations_fops = {
	.open    = reservations_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = single_release,
	.owner   = THIS_MODULE,
};

static int drp_avail_print(struct seq_file *s, void *p)
{
	struct uwb_rc *rc = s->private;
	char buf[72];

	bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.global, UWB_NUM_MAS);
	seq_printf(s, "global:  %s\n", buf);
	bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.local, UWB_NUM_MAS);
	seq_printf(s, "local:   %s\n", buf);
	bitmap_scnprintf(buf, sizeof(buf), rc->drp_avail.pending, UWB_NUM_MAS);
	seq_printf(s, "pending: %s\n", buf);

	return 0;
}

static int drp_avail_open(struct inode *inode, struct file *file)
{
	return single_open(file, drp_avail_print, inode->i_private);
}

static const struct file_operations drp_avail_fops = {
	.open    = drp_avail_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = single_release,
	.owner   = THIS_MODULE,
};

static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
{
	struct device *dev = &pal->rc->uwb_dev.dev;

	if (channel > 0)
		dev_info(dev, "debug: channel %d started\n", channel);
	else
		dev_info(dev, "debug: channel stopped\n");
}

static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
{
	struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);

	if (dbg->accept) {
		spin_lock(&dbg->list_lock);
		list_add_tail(&rsv->pal_node, &dbg->rsvs);
		spin_unlock(&dbg->list_lock);
		uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
	}
}

/**
 * uwb_dbg_add_rc - add a debug interface for a radio controller
 * @rc: the radio controller
 */
void uwb_dbg_add_rc(struct uwb_rc *rc)
{
	rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
	if (rc->dbg == NULL)
		return;

	INIT_LIST_HEAD(&rc->dbg->rsvs);
	spin_lock_init(&(rc->dbg)->list_lock);

	uwb_pal_init(&rc->dbg->pal);
	rc->dbg->pal.rc = rc;
	rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
	rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
	uwb_pal_register(&rc->dbg->pal);

	if (root_dir) {
		rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
						     root_dir);
		rc->dbg->command_f = debugfs_create_file("command", 0200,
							 rc->dbg->root_d, rc,
							 &command_fops);
		rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
							      rc->dbg->root_d, rc,
							      &reservations_fops);
		rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
							rc->dbg->root_d,
							&rc->dbg->accept);
		rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
							   rc->dbg->root_d, rc,
							   &drp_avail_fops);
	}
}

/**
 * uwb_dbg_del_rc - remove a radio controller's debug interface
 * @rc: the radio controller
 */
void uwb_dbg_del_rc(struct uwb_rc *rc)
{
	struct uwb_rsv *rsv, *t;

	if (rc->dbg == NULL)
		return;

	list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
		uwb_rsv_terminate(rsv);
	}

	uwb_pal_unregister(&rc->dbg->pal);

	if (root_dir) {
		debugfs_remove(rc->dbg->drp_avail_f);
		debugfs_remove(rc->dbg->accept_f);
		debugfs_remove(rc->dbg->reservations_f);
		debugfs_remove(rc->dbg->command_f);
		debugfs_remove(rc->dbg->root_d);
	}
}

/**
 * uwb_dbg_exit - initialize the debug interface sub-module
 */
void uwb_dbg_init(void)
{
	root_dir = debugfs_create_dir("uwb", NULL);
}

/**
 * uwb_dbg_exit - clean-up the debug interface sub-module
 */
void uwb_dbg_exit(void)
{
	debugfs_remove(root_dir);
}

/**
 * uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
 * @pal: The PAL.
 */
struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal)
{
	struct uwb_rc *rc = pal->rc;

	if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
		return debugfs_create_dir(pal->name, rc->dbg->root_d);
	return NULL;
}