mac80211: quiesce vif before suspending
[linux-2.6.git] / net / mac80211 / rc80211_pid_debugfs.c
1 /*
2  * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8
9 #include <linux/sched.h>
10 #include <linux/spinlock.h>
11 #include <linux/poll.h>
12 #include <linux/netdevice.h>
13 #include <linux/types.h>
14 #include <linux/skbuff.h>
15 #include <linux/slab.h>
16
17 #include <net/mac80211.h>
18 #include "rate.h"
19
20 #include "rc80211_pid.h"
21
22 static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
23                                    enum rc_pid_event_type type,
24                                    union rc_pid_event_data *data)
25 {
26         struct rc_pid_event *ev;
27         unsigned long status;
28
29         spin_lock_irqsave(&buf->lock, status);
30         ev = &(buf->ring[buf->next_entry]);
31         buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
32
33         ev->timestamp = jiffies;
34         ev->id = buf->ev_count++;
35         ev->type = type;
36         ev->data = *data;
37
38         spin_unlock_irqrestore(&buf->lock, status);
39
40         wake_up_all(&buf->waitqueue);
41 }
42
43 void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
44                                       struct ieee80211_tx_info *stat)
45 {
46         union rc_pid_event_data evd;
47
48         evd.flags = stat->flags;
49         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
50         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
51 }
52
53 void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
54                                                int index, int rate)
55 {
56         union rc_pid_event_data evd;
57
58         evd.index = index;
59         evd.rate = rate;
60         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
61 }
62
63 void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
64                                            int index, int rate)
65 {
66         union rc_pid_event_data evd;
67
68         evd.index = index;
69         evd.rate = rate;
70         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
71 }
72
73 void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
74                                              s32 pf_sample, s32 prop_err,
75                                              s32 int_err, s32 der_err)
76 {
77         union rc_pid_event_data evd;
78
79         evd.pf_sample = pf_sample;
80         evd.prop_err = prop_err;
81         evd.int_err = int_err;
82         evd.der_err = der_err;
83         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
84 }
85
86 static int rate_control_pid_events_open(struct inode *inode, struct file *file)
87 {
88         struct rc_pid_sta_info *sinfo = inode->i_private;
89         struct rc_pid_event_buffer *events = &sinfo->events;
90         struct rc_pid_events_file_info *file_info;
91         unsigned long status;
92
93         /* Allocate a state struct */
94         file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
95         if (file_info == NULL)
96                 return -ENOMEM;
97
98         spin_lock_irqsave(&events->lock, status);
99
100         file_info->next_entry = events->next_entry;
101         file_info->events = events;
102
103         spin_unlock_irqrestore(&events->lock, status);
104
105         file->private_data = file_info;
106
107         return 0;
108 }
109
110 static int rate_control_pid_events_release(struct inode *inode,
111                                            struct file *file)
112 {
113         struct rc_pid_events_file_info *file_info = file->private_data;
114
115         kfree(file_info);
116
117         return 0;
118 }
119
120 static unsigned int rate_control_pid_events_poll(struct file *file,
121                                                  poll_table *wait)
122 {
123         struct rc_pid_events_file_info *file_info = file->private_data;
124
125         poll_wait(file, &file_info->events->waitqueue, wait);
126
127         return POLLIN | POLLRDNORM;
128 }
129
130 #define RC_PID_PRINT_BUF_SIZE 64
131
132 static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
133                                             size_t length, loff_t *offset)
134 {
135         struct rc_pid_events_file_info *file_info = file->private_data;
136         struct rc_pid_event_buffer *events = file_info->events;
137         struct rc_pid_event *ev;
138         char pb[RC_PID_PRINT_BUF_SIZE];
139         int ret;
140         int p;
141         unsigned long status;
142
143         /* Check if there is something to read. */
144         if (events->next_entry == file_info->next_entry) {
145                 if (file->f_flags & O_NONBLOCK)
146                         return -EAGAIN;
147
148                 /* Wait */
149                 ret = wait_event_interruptible(events->waitqueue,
150                                 events->next_entry != file_info->next_entry);
151
152                 if (ret)
153                         return ret;
154         }
155
156         /* Write out one event per call. I don't care whether it's a little
157          * inefficient, this is debugging code anyway. */
158         spin_lock_irqsave(&events->lock, status);
159
160         /* Get an event */
161         ev = &(events->ring[file_info->next_entry]);
162         file_info->next_entry = (file_info->next_entry + 1) %
163                                 RC_PID_EVENT_RING_SIZE;
164
165         /* Print information about the event. Note that userspace needs to
166          * provide large enough buffers. */
167         length = length < RC_PID_PRINT_BUF_SIZE ?
168                  length : RC_PID_PRINT_BUF_SIZE;
169         p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
170         switch (ev->type) {
171         case RC_PID_EVENT_TYPE_TX_STATUS:
172                 p += snprintf(pb + p, length - p, "tx_status %u %u",
173                               !(ev->data.flags & IEEE80211_TX_STAT_ACK),
174                               ev->data.tx_status.status.rates[0].idx);
175                 break;
176         case RC_PID_EVENT_TYPE_RATE_CHANGE:
177                 p += snprintf(pb + p, length - p, "rate_change %d %d",
178                               ev->data.index, ev->data.rate);
179                 break;
180         case RC_PID_EVENT_TYPE_TX_RATE:
181                 p += snprintf(pb + p, length - p, "tx_rate %d %d",
182                               ev->data.index, ev->data.rate);
183                 break;
184         case RC_PID_EVENT_TYPE_PF_SAMPLE:
185                 p += snprintf(pb + p, length - p,
186                               "pf_sample %d %d %d %d",
187                               ev->data.pf_sample, ev->data.prop_err,
188                               ev->data.int_err, ev->data.der_err);
189                 break;
190         }
191         p += snprintf(pb + p, length - p, "\n");
192
193         spin_unlock_irqrestore(&events->lock, status);
194
195         if (copy_to_user(buf, pb, p))
196                 return -EFAULT;
197
198         return p;
199 }
200
201 #undef RC_PID_PRINT_BUF_SIZE
202
203 static const struct file_operations rc_pid_fop_events = {
204         .owner = THIS_MODULE,
205         .read = rate_control_pid_events_read,
206         .poll = rate_control_pid_events_poll,
207         .open = rate_control_pid_events_open,
208         .release = rate_control_pid_events_release,
209         .llseek = noop_llseek,
210 };
211
212 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
213                                              struct dentry *dir)
214 {
215         struct rc_pid_sta_info *spinfo = priv_sta;
216
217         spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
218                                                    dir, spinfo,
219                                                    &rc_pid_fop_events);
220 }
221
222 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
223 {
224         struct rc_pid_sta_info *spinfo = priv_sta;
225
226         debugfs_remove(spinfo->events_entry);
227 }