ARM: tegra: dvfs: Add interface to set fmax at vmin
[linux-3.10.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 #include <linux/export.h>
17
18 #include <net/mac80211.h>
19 #include "rate.h"
20
21 #include "rc80211_pid.h"
22
23 static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
24                                    enum rc_pid_event_type type,
25                                    union rc_pid_event_data *data)
26 {
27         struct rc_pid_event *ev;
28         unsigned long status;
29
30         spin_lock_irqsave(&buf->lock, status);
31         ev = &(buf->ring[buf->next_entry]);
32         buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
33
34         ev->timestamp = jiffies;
35         ev->id = buf->ev_count++;
36         ev->type = type;
37         ev->data = *data;
38
39         spin_unlock_irqrestore(&buf->lock, status);
40
41         wake_up_all(&buf->waitqueue);
42 }
43
44 void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
45                                       struct ieee80211_tx_info *stat)
46 {
47         union rc_pid_event_data evd;
48
49         evd.flags = stat->flags;
50         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
51         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
52 }
53
54 void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
55                                                int index, int rate)
56 {
57         union rc_pid_event_data evd;
58
59         evd.index = index;
60         evd.rate = rate;
61         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
62 }
63
64 void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
65                                            int index, int rate)
66 {
67         union rc_pid_event_data evd;
68
69         evd.index = index;
70         evd.rate = rate;
71         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
72 }
73
74 void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
75                                              s32 pf_sample, s32 prop_err,
76                                              s32 int_err, s32 der_err)
77 {
78         union rc_pid_event_data evd;
79
80         evd.pf_sample = pf_sample;
81         evd.prop_err = prop_err;
82         evd.int_err = int_err;
83         evd.der_err = der_err;
84         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
85 }
86
87 static int rate_control_pid_events_open(struct inode *inode, struct file *file)
88 {
89         struct rc_pid_sta_info *sinfo = inode->i_private;
90         struct rc_pid_event_buffer *events = &sinfo->events;
91         struct rc_pid_events_file_info *file_info;
92         unsigned long status;
93
94         /* Allocate a state struct */
95         file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
96         if (file_info == NULL)
97                 return -ENOMEM;
98
99         spin_lock_irqsave(&events->lock, status);
100
101         file_info->next_entry = events->next_entry;
102         file_info->events = events;
103
104         spin_unlock_irqrestore(&events->lock, status);
105
106         file->private_data = file_info;
107
108         return 0;
109 }
110
111 static int rate_control_pid_events_release(struct inode *inode,
112                                            struct file *file)
113 {
114         struct rc_pid_events_file_info *file_info = file->private_data;
115
116         kfree(file_info);
117
118         return 0;
119 }
120
121 static unsigned int rate_control_pid_events_poll(struct file *file,
122                                                  poll_table *wait)
123 {
124         struct rc_pid_events_file_info *file_info = file->private_data;
125
126         poll_wait(file, &file_info->events->waitqueue, wait);
127
128         return POLLIN | POLLRDNORM;
129 }
130
131 #define RC_PID_PRINT_BUF_SIZE 64
132
133 static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
134                                             size_t length, loff_t *offset)
135 {
136         struct rc_pid_events_file_info *file_info = file->private_data;
137         struct rc_pid_event_buffer *events = file_info->events;
138         struct rc_pid_event *ev;
139         char pb[RC_PID_PRINT_BUF_SIZE];
140         int ret;
141         int p;
142         unsigned long status;
143
144         /* Check if there is something to read. */
145         if (events->next_entry == file_info->next_entry) {
146                 if (file->f_flags & O_NONBLOCK)
147                         return -EAGAIN;
148
149                 /* Wait */
150                 ret = wait_event_interruptible(events->waitqueue,
151                                 events->next_entry != file_info->next_entry);
152
153                 if (ret)
154                         return ret;
155         }
156
157         /* Write out one event per call. I don't care whether it's a little
158          * inefficient, this is debugging code anyway. */
159         spin_lock_irqsave(&events->lock, status);
160
161         /* Get an event */
162         ev = &(events->ring[file_info->next_entry]);
163         file_info->next_entry = (file_info->next_entry + 1) %
164                                 RC_PID_EVENT_RING_SIZE;
165
166         /* Print information about the event. Note that userspace needs to
167          * provide large enough buffers. */
168         length = length < RC_PID_PRINT_BUF_SIZE ?
169                  length : RC_PID_PRINT_BUF_SIZE;
170         p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
171         switch (ev->type) {
172         case RC_PID_EVENT_TYPE_TX_STATUS:
173                 p += snprintf(pb + p, length - p, "tx_status %u %u",
174                               !(ev->data.flags & IEEE80211_TX_STAT_ACK),
175                               ev->data.tx_status.status.rates[0].idx);
176                 break;
177         case RC_PID_EVENT_TYPE_RATE_CHANGE:
178                 p += snprintf(pb + p, length - p, "rate_change %d %d",
179                               ev->data.index, ev->data.rate);
180                 break;
181         case RC_PID_EVENT_TYPE_TX_RATE:
182                 p += snprintf(pb + p, length - p, "tx_rate %d %d",
183                               ev->data.index, ev->data.rate);
184                 break;
185         case RC_PID_EVENT_TYPE_PF_SAMPLE:
186                 p += snprintf(pb + p, length - p,
187                               "pf_sample %d %d %d %d",
188                               ev->data.pf_sample, ev->data.prop_err,
189                               ev->data.int_err, ev->data.der_err);
190                 break;
191         }
192         p += snprintf(pb + p, length - p, "\n");
193
194         spin_unlock_irqrestore(&events->lock, status);
195
196         if (copy_to_user(buf, pb, p))
197                 return -EFAULT;
198
199         return p;
200 }
201
202 #undef RC_PID_PRINT_BUF_SIZE
203
204 static const struct file_operations rc_pid_fop_events = {
205         .owner = THIS_MODULE,
206         .read = rate_control_pid_events_read,
207         .poll = rate_control_pid_events_poll,
208         .open = rate_control_pid_events_open,
209         .release = rate_control_pid_events_release,
210         .llseek = noop_llseek,
211 };
212
213 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
214                                              struct dentry *dir)
215 {
216         struct rc_pid_sta_info *spinfo = priv_sta;
217
218         spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
219                                                    dir, spinfo,
220                                                    &rc_pid_fop_events);
221 }
222
223 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
224 {
225         struct rc_pid_sta_info *spinfo = priv_sta;
226
227         debugfs_remove(spinfo->events_entry);
228 }