drivers/net/wireless/ath/ath9k/dfs_debug.c

   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
  24
  25 struct ath_dfs_pool_stats global_dfs_pool_stats = { 0 };
  26
  27 #define ATH9K_DFS_STAT(s, p) \
  28         len += snprintf(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 += snprintf(buf + len, size - len, "%28s : %10u\n", s, \
  32                         global_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 += snprintf(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         len += snprintf(buf + len, size - len, "Pulse detector statistics:\n");
  53         ATH9K_DFS_STAT("pulse events reported   ", pulses_total);
  54         ATH9K_DFS_STAT("invalid pulse events    ", pulses_no_dfs);
  55         ATH9K_DFS_STAT("DFS pulses detected     ", pulses_detected);
  56         ATH9K_DFS_STAT("Datalen discards        ", datalen_discards);
  57         ATH9K_DFS_STAT("RSSI discards           ", rssi_discards);
  58         ATH9K_DFS_STAT("BW info discards        ", bwinfo_discards);
  59         ATH9K_DFS_STAT("Primary channel pulses  ", pri_phy_errors);
  60         ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
  61         ATH9K_DFS_STAT("Dual channel pulses     ", dc_phy_errors);
  62         len += snprintf(buf + len, size - len, "Radar detector statistics "
  63                         "(current DFS region: %d)\n", sc->dfs_detector->region);
  64         ATH9K_DFS_STAT("Pulse events processed  ", pulses_processed);
  65         ATH9K_DFS_STAT("Radars detected         ", radar_detected);
  66         len += snprintf(buf + len, size - len, "Global Pool statistics:\n");
  67         ATH9K_DFS_POOL_STAT("Pool references         ", pool_reference);
  68         ATH9K_DFS_POOL_STAT("Pulses allocated        ", pulse_allocated);
  69         ATH9K_DFS_POOL_STAT("Pulses alloc error      ", pulse_alloc_error);
  70         ATH9K_DFS_POOL_STAT("Pulses in use           ", pulse_used);
  71         ATH9K_DFS_POOL_STAT("Seqs. allocated         ", pseq_allocated);
  72         ATH9K_DFS_POOL_STAT("Seqs. alloc error       ", pseq_alloc_error);
  73         ATH9K_DFS_POOL_STAT("Seqs. in use            ", pseq_used);
  74
  75         if (len > size)
  76                 len = size;
  77
  78         retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
  79         kfree(buf);
  80
  81         return retval;
  82 }
  83
  84 /* magic number to prevent accidental reset of DFS statistics */
  85 #define DFS_STATS_RESET_MAGIC   0x80000000
  86 static ssize_t write_file_dfs(struct file *file, const char __user *user_buf,
  87                               size_t count, loff_t *ppos)
  88 {
  89         struct ath_softc *sc = file->private_data;
  90         unsigned long val;
  91         char buf[32];
  92         ssize_t len;
  93
  94         len = min(count, sizeof(buf) - 1);
  95         if (copy_from_user(buf, user_buf, len))
  96                 return -EFAULT;
  97
  98         buf[len] = '\0';
  99         if (kstrtoul(buf, 0, &val))
 100                 return -EINVAL;
 101
 102         if (val == DFS_STATS_RESET_MAGIC)
 103                 memset(&sc->debug.stats.dfs_stats, 0,
 104                        sizeof(sc->debug.stats.dfs_stats));
 105         return count;
 106 }
 107
 108 static ssize_t write_file_simulate_radar(struct file *file,
 109                                          const char __user *user_buf,
 110                                          size_t count, loff_t *ppos)
 111 {
 112         struct ath_softc *sc = file->private_data;
 113
 114         ieee80211_radar_detected(sc->hw);
 115
 116         return count;
 117 }
 118
 119 static const struct file_operations fops_simulate_radar = {
 120         .write = write_file_simulate_radar,
 121         .open = simple_open,
 122         .owner = THIS_MODULE,
 123         .llseek = default_llseek,
 124 };
 125
 126 static const struct file_operations fops_dfs_stats = {
 127         .read = read_file_dfs,
 128         .write = write_file_dfs,
 129         .open = simple_open,
 130         .owner = THIS_MODULE,
 131         .llseek = default_llseek,
 132 };
 133
 134 void ath9k_dfs_init_debug(struct ath_softc *sc)
 135 {
 136         debugfs_create_file("dfs_stats", S_IRUSR,
 137                             sc->debug.debugfs_phy, sc, &fops_dfs_stats);
 138         debugfs_create_file("dfs_simulate_radar", S_IWUSR,
 139                             sc->debug.debugfs_phy, sc, &fops_simulate_radar);
 140 }