Root/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
18static struct dentry *ag71xx_debugfs_root;
19
20static int ag71xx_debugfs_generic_open(struct inode *inode, struct file *file)
21{
22    file->private_data = inode->i_private;
23    return 0;
24}
25
26void 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
44static 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
68static 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
74void 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
97static 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
146static 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
154static 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    char *buf;
161    unsigned int buflen;
162    unsigned int len = 0;
163    unsigned long flags;
164    ssize_t ret;
165    int curr;
166    int dirty;
167    u32 desc_hw;
168    int i;
169
170    buflen = (ring->size * DESC_PRINT_LEN);
171    buf = kmalloc(buflen, GFP_KERNEL);
172    if (!buf)
173        return -ENOMEM;
174
175    len += snprintf(buf + len, buflen - len,
176            "Idx ... %-8s %-8s %-8s %-8s . %-10s\n",
177            "desc", "next", "data", "ctrl", "timestamp");
178
179    spin_lock_irqsave(&ag->lock, flags);
180
181    curr = (ring->curr % ring->size);
182    dirty = (ring->dirty % ring->size);
183    desc_hw = ag71xx_rr(ag, desc_reg);
184    for (i = 0; i < ring->size; i++) {
185        struct ag71xx_buf *ab = &ring->buf[i];
186        u32 desc_dma = ((u32) ring->descs_dma) + i * ring->desc_size;
187
188        len += snprintf(buf + len, buflen - len,
189            "%3d %c%c%c %08x %08x %08x %08x %c %10lu\n",
190            i,
191            (i == curr) ? 'C' : ' ',
192            (i == dirty) ? 'D' : ' ',
193            (desc_hw == desc_dma) ? 'H' : ' ',
194            desc_dma,
195            ab->desc->next,
196            ab->desc->data,
197            ab->desc->ctrl,
198            (ab->desc->ctrl & DESC_EMPTY) ? 'E' : '*',
199            ab->timestamp);
200    }
201
202    spin_unlock_irqrestore(&ag->lock, flags);
203
204    ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
205    kfree(buf);
206
207    return ret;
208}
209
210static ssize_t read_file_tx_ring(struct file *file, char __user *user_buf,
211                 size_t count, loff_t *ppos)
212{
213    struct ag71xx *ag = file->private_data;
214
215    return read_file_ring(file, user_buf, count, ppos, ag, &ag->tx_ring,
216                  AG71XX_REG_TX_DESC);
217}
218
219static const struct file_operations ag71xx_fops_tx_ring = {
220    .open = ag71xx_debugfs_generic_open,
221    .read = read_file_tx_ring,
222    .owner = THIS_MODULE
223};
224
225static ssize_t read_file_rx_ring(struct file *file, char __user *user_buf,
226                 size_t count, loff_t *ppos)
227{
228    struct ag71xx *ag = file->private_data;
229
230    return read_file_ring(file, user_buf, count, ppos, ag, &ag->rx_ring,
231                  AG71XX_REG_RX_DESC);
232}
233
234static const struct file_operations ag71xx_fops_rx_ring = {
235    .open = ag71xx_debugfs_generic_open,
236    .read = read_file_rx_ring,
237    .owner = THIS_MODULE
238};
239
240void ag71xx_debugfs_exit(struct ag71xx *ag)
241{
242    debugfs_remove_recursive(ag->debug.debugfs_dir);
243}
244
245int ag71xx_debugfs_init(struct ag71xx *ag)
246{
247    ag->debug.debugfs_dir = debugfs_create_dir(ag->dev->name,
248                           ag71xx_debugfs_root);
249    if (!ag->debug.debugfs_dir)
250        return -ENOMEM;
251
252    debugfs_create_file("int_stats", S_IRUGO, ag->debug.debugfs_dir,
253                ag, &ag71xx_fops_int_stats);
254    debugfs_create_file("napi_stats", S_IRUGO, ag->debug.debugfs_dir,
255                ag, &ag71xx_fops_napi_stats);
256    debugfs_create_file("tx_ring", S_IRUGO, ag->debug.debugfs_dir,
257                ag, &ag71xx_fops_tx_ring);
258    debugfs_create_file("rx_ring", S_IRUGO, ag->debug.debugfs_dir,
259                ag, &ag71xx_fops_rx_ring);
260
261    return 0;
262}
263
264int ag71xx_debugfs_root_init(void)
265{
266    if (ag71xx_debugfs_root)
267        return -EBUSY;
268
269    ag71xx_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
270    if (!ag71xx_debugfs_root)
271        return -ENOENT;
272
273    return 0;
274}
275
276void ag71xx_debugfs_root_exit(void)
277{
278    debugfs_remove(ag71xx_debugfs_root);
279    ag71xx_debugfs_root = NULL;
280}
281

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