ath/ath9k/dfs_debug.c

0001 /*
0002  * Copyright (c) 2008-2011 Atheros Communications Inc.
0003  * Copyright (c) 2011 Neratec Solutions AG
0004  *
0005  * Permission to use, copy, modify, and/or distribute this software for any
0006  * purpose with or without fee is hereby granted, provided that the above
0007  * copyright notice and this permission notice appear in all copies.
0008  *
0009  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
0010  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
0011  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
0012  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
0013  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
0014  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
0015  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0016  */
0017
0018 #include <linux/debugfs.h>
0019 #include <linux/export.h>
0020
0021 #include "ath9k.h"
0022 #include "dfs_debug.h"
0023 #include "../dfs_pattern_detector.h"
0024
0025 static struct ath_dfs_pool_stats dfs_pool_stats = { 0 };
0026
0027 #define ATH9K_DFS_STAT(s, p) \
0028     len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
0029              sc->debug.stats.dfs_stats.p)
0030 #define ATH9K_DFS_POOL_STAT(s, p) \
0031     len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
0032              dfs_pool_stats.p);
0033
0034 static ssize_t read_file_dfs(struct file *file, char __user *user_buf,
0035                  size_t count, loff_t *ppos)
0036 {
0037     struct ath_softc *sc = file->private_data;
0038     struct ath9k_hw_version *hw_ver = &sc->sc_ah->hw_version;
0039     char *buf;
0040     unsigned int len = 0, size = 8000;
0041     ssize_t retval = 0;
0042
0043     buf = kzalloc(size, GFP_KERNEL);
0044     if (buf == NULL)
0045         return -ENOMEM;
0046
0047     len += scnprintf(buf + len, size - len, "DFS support for "
0048              "macVersion = 0x%x, macRev = 0x%x: %s\n",
0049              hw_ver->macVersion, hw_ver->macRev,
0050              (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_DFS) ?
0051                     "enabled" : "disabled");
0052
0053     if (!sc->dfs_detector) {
0054         len += scnprintf(buf + len, size - len,
0055                  "DFS detector not enabled\n");
0056         goto exit;
0057     }
0058
0059     dfs_pool_stats = sc->dfs_detector->get_stats(sc->dfs_detector);
0060
0061     len += scnprintf(buf + len, size - len, "Pulse detector statistics:\n");
0062     ATH9K_DFS_STAT("pulse events reported   ", pulses_total);
0063     ATH9K_DFS_STAT("invalid pulse events    ", pulses_no_dfs);
0064     ATH9K_DFS_STAT("DFS pulses detected     ", pulses_detected);
0065     ATH9K_DFS_STAT("Datalen discards        ", datalen_discards);
0066     ATH9K_DFS_STAT("RSSI discards           ", rssi_discards);
0067     ATH9K_DFS_STAT("BW info discards        ", bwinfo_discards);
0068     ATH9K_DFS_STAT("Primary channel pulses  ", pri_phy_errors);
0069     ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
0070     ATH9K_DFS_STAT("Dual channel pulses     ", dc_phy_errors);
0071     len += scnprintf(buf + len, size - len, "Radar detector statistics "
0072              "(current DFS region: %d)\n",
0073              sc->dfs_detector->region);
0074     ATH9K_DFS_STAT("Pulse events processed  ", pulses_processed);
0075     ATH9K_DFS_STAT("Radars detected         ", radar_detected);
0076     len += scnprintf(buf + len, size - len, "Global Pool statistics:\n");
0077     ATH9K_DFS_POOL_STAT("Pool references         ", pool_reference);
0078     ATH9K_DFS_POOL_STAT("Pulses allocated        ", pulse_allocated);
0079     ATH9K_DFS_POOL_STAT("Pulses alloc error      ", pulse_alloc_error);
0080     ATH9K_DFS_POOL_STAT("Pulses in use           ", pulse_used);
0081     ATH9K_DFS_POOL_STAT("Seqs. allocated         ", pseq_allocated);
0082     ATH9K_DFS_POOL_STAT("Seqs. alloc error       ", pseq_alloc_error);
0083     ATH9K_DFS_POOL_STAT("Seqs. in use            ", pseq_used);
0084
0085 exit:
0086     if (len > size)
0087         len = size;
0088
0089     retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
0090     kfree(buf);
0091
0092     return retval;
0093 }
0094
0095 /* magic number to prevent accidental reset of DFS statistics */
0096 #define DFS_STATS_RESET_MAGIC   0x80000000
0097 static ssize_t write_file_dfs(struct file *file, const char __user *user_buf,
0098                   size_t count, loff_t *ppos)
0099 {
0100     struct ath_softc *sc = file->private_data;
0101     unsigned long val;
0102     char buf[32];
0103     ssize_t len;
0104
0105     len = min(count, sizeof(buf) - 1);
0106     if (copy_from_user(buf, user_buf, len))
0107         return -EFAULT;
0108
0109     buf[len] = '\0';
0110     if (kstrtoul(buf, 0, &val))
0111         return -EINVAL;
0112
0113     if (val == DFS_STATS_RESET_MAGIC)
0114         memset(&sc->debug.stats.dfs_stats, 0,
0115                sizeof(sc->debug.stats.dfs_stats));
0116     return count;
0117 }
0118
0119 static ssize_t write_file_simulate_radar(struct file *file,
0120                      const char __user *user_buf,
0121                      size_t count, loff_t *ppos)
0122 {
0123     struct ath_softc *sc = file->private_data;
0124
0125     ieee80211_radar_detected(sc->hw);
0126
0127     return count;
0128 }
0129
0130 static const struct file_operations fops_simulate_radar = {
0131     .write = write_file_simulate_radar,
0132     .open = simple_open,
0133     .owner = THIS_MODULE,
0134     .llseek = default_llseek,
0135 };
0136
0137 static const struct file_operations fops_dfs_stats = {
0138     .read = read_file_dfs,
0139     .write = write_file_dfs,
0140     .open = simple_open,
0141     .owner = THIS_MODULE,
0142     .llseek = default_llseek,
0143 };
0144
0145 void ath9k_dfs_init_debug(struct ath_softc *sc)
0146 {
0147     debugfs_create_file("dfs_stats", 0400,
0148                 sc->debug.debugfs_phy, sc, &fops_dfs_stats);
0149     debugfs_create_file("dfs_simulate_radar", 0200,
0150                 sc->debug.debugfs_phy, sc, &fops_simulate_radar);
0151 }