target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_debugfs.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include <linux/debugfs.h>
  15
  16 #include "ag71xx.h"
  17
  18 static struct dentry *ag71xx_debugfs_root;
  19
  20 static int ag71xx_debugfs_generic_open(struct inode *inode, struct file *file)
  21 {
  22         file->private_data = inode->i_private;
  23         return 0;
  24 }
  25
  26 void ag71xx_debugfs_update_int_stats(struct ag71xx *ag, u32 status)
  27 {
  28         if (status)
  29                 ag->debug.int_stats.total++;
  30         if (status & AG71XX_INT_TX_PS)
  31                 ag->debug.int_stats.tx_ps++;
  32         if (status & AG71XX_INT_TX_UR)
  33                 ag->debug.int_stats.tx_ur++;
  34         if (status & AG71XX_INT_TX_BE)
  35                 ag->debug.int_stats.tx_be++;
  36         if (status & AG71XX_INT_RX_PR)
  37                 ag->debug.int_stats.rx_pr++;
  38         if (status & AG71XX_INT_RX_OF)
  39                 ag->debug.int_stats.rx_of++;
  40         if (status & AG71XX_INT_RX_BE)
  41                 ag->debug.int_stats.rx_be++;
  42 }
  43
  44 static ssize_t read_file_int_stats(struct file *file, char __user *user_buf,
  45                                    size_t count, loff_t *ppos)
  46 {
  47 #define PR_INT_STAT(_label, _field)                                     \
  48         len += snprintf(buf + len, sizeof(buf) - len,                   \
  49                 "%20s: %10lu\n", _label, ag->debug.int_stats._field);
  50
  51         struct ag71xx *ag = file->private_data;
  52         char buf[256];
  53         unsigned int len = 0;
  54
  55         PR_INT_STAT("TX Packet Sent", tx_ps);
  56         PR_INT_STAT("TX Underrun", tx_ur);
  57         PR_INT_STAT("TX Bus Error", tx_be);
  58         PR_INT_STAT("RX Packet Received", rx_pr);
  59         PR_INT_STAT("RX Overflow", rx_of);
  60         PR_INT_STAT("RX Bus Error", rx_be);
  61         len += snprintf(buf + len, sizeof(buf) - len, "\n");
  62         PR_INT_STAT("Total", total);
  63
  64         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
  65 #undef PR_INT_STAT
  66 }
  67
  68 static const struct file_operations ag71xx_fops_int_stats = {
  69         .open   = ag71xx_debugfs_generic_open,
  70         .read   = read_file_int_stats,
  71         .owner  = THIS_MODULE
  72 };
  73
  74 void ag71xx_debugfs_update_napi_stats(struct ag71xx *ag, int rx, int tx)
  75 {
  76         struct ag71xx_napi_stats *stats = &ag->debug.napi_stats;
  77
  78         if (rx) {
  79                 stats->rx_count++;
  80                 stats->rx_packets += rx;
  81                 if (rx <= AG71XX_NAPI_WEIGHT)
  82                         stats->rx[rx]++;
  83                 if (rx > stats->rx_packets_max)
  84                         stats->rx_packets_max = rx;
  85         }
  86
  87         if (tx) {
  88                 stats->tx_count++;
  89                 stats->tx_packets += tx;
  90                 if (tx <= AG71XX_NAPI_WEIGHT)
  91                         stats->tx[tx]++;
  92                 if (tx > stats->tx_packets_max)
  93                         stats->tx_packets_max = tx;
  94         }
  95 }
  96
  97 static ssize_t read_file_napi_stats(struct file *file, char __user *user_buf,
  98                                     size_t count, loff_t *ppos)
  99 {
 100         struct ag71xx *ag = file->private_data;
 101         struct ag71xx_napi_stats *stats = &ag->debug.napi_stats;
 102         char *buf;
 103         unsigned int buflen;
 104         unsigned int len = 0;
 105         unsigned long rx_avg = 0;
 106         unsigned long tx_avg = 0;
 107         int ret;
 108         int i;
 109
 110         buflen = 2048;
 111         buf = kmalloc(buflen, GFP_KERNEL);
 112         if (!buf)
 113                 return -ENOMEM;
 114
 115         if (stats->rx_count)
 116                 rx_avg = stats->rx_packets / stats->rx_count;
 117
 118         if (stats->tx_count)
 119                 tx_avg = stats->tx_packets / stats->tx_count;
 120
 121         len += snprintf(buf + len, buflen - len, "%3s  %10s %10s\n",
 122                         "len", "rx", "tx");
 123
 124         for (i = 1; i <= AG71XX_NAPI_WEIGHT; i++)
 125                 len += snprintf(buf + len, buflen - len,
 126                                 "%3d: %10lu %10lu\n",
 127                                 i, stats->rx[i], stats->tx[i]);
 128
 129         len += snprintf(buf + len, buflen - len, "\n");
 130
 131         len += snprintf(buf + len, buflen - len, "%3s: %10lu %10lu\n",
 132                         "sum", stats->rx_count, stats->tx_count);
 133         len += snprintf(buf + len, buflen - len, "%3s: %10lu %10lu\n",
 134                         "avg", rx_avg, tx_avg);
 135         len += snprintf(buf + len, buflen - len, "%3s: %10lu %10lu\n",
 136                         "max", stats->rx_packets_max, stats->tx_packets_max);
 137         len += snprintf(buf + len, buflen - len, "%3s: %10lu %10lu\n",
 138                         "pkt", stats->rx_packets, stats->tx_packets);
 139
 140         ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
 141         kfree(buf);
 142
 143         return ret;
 144 }
 145
 146 static const struct file_operations ag71xx_fops_napi_stats = {
 147         .open   = ag71xx_debugfs_generic_open,
 148         .read   = read_file_napi_stats,
 149         .owner  = THIS_MODULE
 150 };
 151
 152 #define DESC_PRINT_LEN  64
 153
 154 static ssize_t read_file_ring(struct file *file, char __user *user_buf,
 155                               size_t count, loff_t *ppos,
 156                               struct ag71xx *ag,
 157                               struct ag71xx_ring *ring,
 158                               unsigned desc_reg)
 159 {
 160         int ring_size = BIT(ring->order);
 161         int ring_mask = ring_size - 1;
 162         char *buf;
 163         unsigned int buflen;
 164         unsigned int len = 0;
 165         unsigned long flags;
 166         ssize_t ret;
 167         int curr;
 168         int dirty;
 169         u32 desc_hw;
 170         int i;
 171
 172         buflen = (ring_size * DESC_PRINT_LEN);
 173         buf = kmalloc(buflen, GFP_KERNEL);
 174         if (!buf)
 175                 return -ENOMEM;
 176
 177         len += snprintf(buf + len, buflen - len,
 178                         "Idx ... %-8s %-8s %-8s %-8s . %-10s\n",
 179                         "desc", "next", "data", "ctrl", "timestamp");
 180
 181         spin_lock_irqsave(&ag->lock, flags);
 182
 183         curr = (ring->curr & ring_mask);
 184         dirty = (ring->dirty & ring_mask);
 185         desc_hw = ag71xx_rr(ag, desc_reg);
 186         for (i = 0; i < ring_size; i++) {
 187                 struct ag71xx_buf *ab = &ring->buf[i];
 188                 struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
 189                 u32 desc_dma = ((u32) ring->descs_dma) + i * AG71XX_DESC_SIZE;
 190
 191                 len += snprintf(buf + len, buflen - len,
 192                         "%3d %c%c%c %08x %08x %08x %08x %c %10lu\n",
 193                         i,
 194                         (i == curr) ? 'C' : ' ',
 195                         (i == dirty) ? 'D' : ' ',
 196                         (desc_hw == desc_dma) ? 'H' : ' ',
 197                         desc_dma,
 198                         desc->next,
 199                         desc->data,
 200                         desc->ctrl,
 201                         (desc->ctrl & DESC_EMPTY) ? 'E' : '*',
 202                         ab->timestamp);
 203         }
 204
 205         spin_unlock_irqrestore(&ag->lock, flags);
 206
 207         ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
 208         kfree(buf);
 209
 210         return ret;
 211 }
 212
 213 static ssize_t read_file_tx_ring(struct file *file, char __user *user_buf,
 214                                  size_t count, loff_t *ppos)
 215 {
 216         struct ag71xx *ag = file->private_data;
 217
 218         return read_file_ring(file, user_buf, count, ppos, ag, &ag->tx_ring,
 219                               AG71XX_REG_TX_DESC);
 220 }
 221
 222 static const struct file_operations ag71xx_fops_tx_ring = {
 223         .open   = ag71xx_debugfs_generic_open,
 224         .read   = read_file_tx_ring,
 225         .owner  = THIS_MODULE
 226 };
 227
 228 static ssize_t read_file_rx_ring(struct file *file, char __user *user_buf,
 229                                  size_t count, loff_t *ppos)
 230 {
 231         struct ag71xx *ag = file->private_data;
 232
 233         return read_file_ring(file, user_buf, count, ppos, ag, &ag->rx_ring,
 234                               AG71XX_REG_RX_DESC);
 235 }
 236
 237 static const struct file_operations ag71xx_fops_rx_ring = {
 238         .open   = ag71xx_debugfs_generic_open,
 239         .read   = read_file_rx_ring,
 240         .owner  = THIS_MODULE
 241 };
 242
 243 void ag71xx_debugfs_exit(struct ag71xx *ag)
 244 {
 245         debugfs_remove_recursive(ag->debug.debugfs_dir);
 246 }
 247
 248 int ag71xx_debugfs_init(struct ag71xx *ag)
 249 {
 250         struct device *dev = &ag->pdev->dev;
 251
 252         ag->debug.debugfs_dir = debugfs_create_dir(dev_name(dev),
 253                                                    ag71xx_debugfs_root);
 254         if (!ag->debug.debugfs_dir) {
 255                 dev_err(dev, "unable to create debugfs directory\n");
 256                 return -ENOENT;
 257         }
 258
 259         debugfs_create_file("int_stats", S_IRUGO, ag->debug.debugfs_dir,
 260                             ag, &ag71xx_fops_int_stats);
 261         debugfs_create_file("napi_stats", S_IRUGO, ag->debug.debugfs_dir,
 262                             ag, &ag71xx_fops_napi_stats);
 263         debugfs_create_file("tx_ring", S_IRUGO, ag->debug.debugfs_dir,
 264                             ag, &ag71xx_fops_tx_ring);
 265         debugfs_create_file("rx_ring", S_IRUGO, ag->debug.debugfs_dir,
 266                             ag, &ag71xx_fops_rx_ring);
 267
 268         return 0;
 269 }
 270
 271 int ag71xx_debugfs_root_init(void)
 272 {
 273         if (ag71xx_debugfs_root)
 274                 return -EBUSY;
 275
 276         ag71xx_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
 277         if (!ag71xx_debugfs_root)
 278                 return -ENOENT;
 279
 280         return 0;
 281 }
 282
 283 void ag71xx_debugfs_root_exit(void)
 284 {
 285         debugfs_remove(ag71xx_debugfs_root);
 286         ag71xx_debugfs_root = NULL;
 287 }