1 /*
2  * Copyright (c) 2008-2011 Atheros Communications Inc.
3  * Copyright (c) 2011 Neratec Solutions AG
4  *
5  * Permission to use, copy, modify, and/or distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <linux/debugfs.h>
19 #include <linux/export.h>
20 
21 #include "ath9k.h"
22 #include "dfs_debug.h"
23 #include "../dfs_pattern_detector.h"
24 
25 static struct ath_dfs_pool_stats dfs_pool_stats = { 0 };
26 
27 #define ATH9K_DFS_STAT(s, p) \
28 	len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
29 			 sc->debug.stats.dfs_stats.p);
30 #define ATH9K_DFS_POOL_STAT(s, p) \
31 	len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
32 			 dfs_pool_stats.p);
33 
34 static ssize_t read_file_dfs(struct file *file, char __user *user_buf,
35 			     size_t count, loff_t *ppos)
36 {
37 	struct ath_softc *sc = file->private_data;
38 	struct ath9k_hw_version *hw_ver = &sc->sc_ah->hw_version;
39 	char *buf;
40 	unsigned int len = 0, size = 8000;
41 	ssize_t retval = 0;
42 
43 	buf = kzalloc(size, GFP_KERNEL);
44 	if (buf == NULL)
45 		return -ENOMEM;
46 
47 	len += scnprintf(buf + len, size - len, "DFS support for "
48 			 "macVersion = 0x%x, macRev = 0x%x: %s\n",
49 			 hw_ver->macVersion, hw_ver->macRev,
50 			 (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_DFS) ?
51 					"enabled" : "disabled");
52 
53 	if (!sc->dfs_detector) {
54 		len += scnprintf(buf + len, size - len,
55 				 "DFS detector not enabled\n");
56 		goto exit;
57 	}
58 
59 	dfs_pool_stats = sc->dfs_detector->get_stats(sc->dfs_detector);
60 
61 	len += scnprintf(buf + len, size - len, "Pulse detector statistics:\n");
62 	ATH9K_DFS_STAT("pulse events reported   ", pulses_total);
63 	ATH9K_DFS_STAT("invalid pulse events    ", pulses_no_dfs);
64 	ATH9K_DFS_STAT("DFS pulses detected     ", pulses_detected);
65 	ATH9K_DFS_STAT("Datalen discards        ", datalen_discards);
66 	ATH9K_DFS_STAT("RSSI discards           ", rssi_discards);
67 	ATH9K_DFS_STAT("BW info discards        ", bwinfo_discards);
68 	ATH9K_DFS_STAT("Primary channel pulses  ", pri_phy_errors);
69 	ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
70 	ATH9K_DFS_STAT("Dual channel pulses     ", dc_phy_errors);
71 	len += scnprintf(buf + len, size - len, "Radar detector statistics "
72 			 "(current DFS region: %d)\n",
73 			 sc->dfs_detector->region);
74 	ATH9K_DFS_STAT("Pulse events processed  ", pulses_processed);
75 	ATH9K_DFS_STAT("Radars detected         ", radar_detected);
76 	len += scnprintf(buf + len, size - len, "Global Pool statistics:\n");
77 	ATH9K_DFS_POOL_STAT("Pool references         ", pool_reference);
78 	ATH9K_DFS_POOL_STAT("Pulses allocated        ", pulse_allocated);
79 	ATH9K_DFS_POOL_STAT("Pulses alloc error      ", pulse_alloc_error);
80 	ATH9K_DFS_POOL_STAT("Pulses in use           ", pulse_used);
81 	ATH9K_DFS_POOL_STAT("Seqs. allocated         ", pseq_allocated);
82 	ATH9K_DFS_POOL_STAT("Seqs. alloc error       ", pseq_alloc_error);
83 	ATH9K_DFS_POOL_STAT("Seqs. in use            ", pseq_used);
84 
85 exit:
86 	if (len > size)
87 		len = size;
88 
89 	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
90 	kfree(buf);
91 
92 	return retval;
93 }
94 
95 /* magic number to prevent accidental reset of DFS statistics */
96 #define DFS_STATS_RESET_MAGIC	0x80000000
97 static ssize_t write_file_dfs(struct file *file, const char __user *user_buf,
98 			      size_t count, loff_t *ppos)
99 {
100 	struct ath_softc *sc = file->private_data;
101 	unsigned long val;
102 	char buf[32];
103 	ssize_t len;
104 
105 	len = min(count, sizeof(buf) - 1);
106 	if (copy_from_user(buf, user_buf, len))
107 		return -EFAULT;
108 
109 	buf[len] = '\0';
110 	if (kstrtoul(buf, 0, &val))
111 		return -EINVAL;
112 
113 	if (val == DFS_STATS_RESET_MAGIC)
114 		memset(&sc->debug.stats.dfs_stats, 0,
115 		       sizeof(sc->debug.stats.dfs_stats));
116 	return count;
117 }
118 
119 static ssize_t write_file_simulate_radar(struct file *file,
120 					 const char __user *user_buf,
121 					 size_t count, loff_t *ppos)
122 {
123 	struct ath_softc *sc = file->private_data;
124 
125 	ieee80211_radar_detected(sc->hw);
126 
127 	return count;
128 }
129 
130 static const struct file_operations fops_simulate_radar = {
131 	.write = write_file_simulate_radar,
132 	.open = simple_open,
133 	.owner = THIS_MODULE,
134 	.llseek = default_llseek,
135 };
136 
137 static const struct file_operations fops_dfs_stats = {
138 	.read = read_file_dfs,
139 	.write = write_file_dfs,
140 	.open = simple_open,
141 	.owner = THIS_MODULE,
142 	.llseek = default_llseek,
143 };
144 
145 void ath9k_dfs_init_debug(struct ath_softc *sc)
146 {
147 	debugfs_create_file("dfs_stats", S_IRUSR,
148 			    sc->debug.debugfs_phy, sc, &fops_dfs_stats);
149 	debugfs_create_file("dfs_simulate_radar", S_IWUSR,
150 			    sc->debug.debugfs_phy, sc, &fops_simulate_radar);
151 }
152