452 lines
10 KiB
C
452 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Broadcom B43legacy wireless driver
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debugfs driver debugging code
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Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
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*/
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/pci.h>
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#include <linux/mutex.h>
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#include "b43legacy.h"
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#include "main.h"
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#include "debugfs.h"
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#include "dma.h"
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#include "pio.h"
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#include "xmit.h"
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/* The root directory. */
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static struct dentry *rootdir;
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struct b43legacy_debugfs_fops {
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ssize_t (*read)(struct b43legacy_wldev *dev, char *buf, size_t bufsize);
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int (*write)(struct b43legacy_wldev *dev, const char *buf, size_t count);
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struct file_operations fops;
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/* Offset of struct b43legacy_dfs_file in struct b43legacy_dfsentry */
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size_t file_struct_offset;
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/* Take wl->irq_lock before calling read/write? */
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bool take_irqlock;
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};
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static inline
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struct b43legacy_dfs_file * fops_to_dfs_file(struct b43legacy_wldev *dev,
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const struct b43legacy_debugfs_fops *dfops)
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{
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void *p;
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p = dev->dfsentry;
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p += dfops->file_struct_offset;
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return p;
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}
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#define fappend(fmt, x...) \
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do { \
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if (bufsize - count) \
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count += scnprintf(buf + count, \
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bufsize - count, \
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fmt , ##x); \
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else \
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printk(KERN_ERR "b43legacy: fappend overflow\n"); \
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} while (0)
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/* wl->irq_lock is locked */
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static ssize_t tsf_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
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{
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ssize_t count = 0;
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u64 tsf;
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b43legacy_tsf_read(dev, &tsf);
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fappend("0x%08x%08x\n",
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(unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32),
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(unsigned int)(tsf & 0xFFFFFFFFULL));
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return count;
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}
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/* wl->irq_lock is locked */
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static int tsf_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count)
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{
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u64 tsf;
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if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1)
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return -EINVAL;
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b43legacy_tsf_write(dev, tsf);
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return 0;
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}
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/* wl->irq_lock is locked */
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static ssize_t ucode_regs_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
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{
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ssize_t count = 0;
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int i;
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for (i = 0; i < 64; i++) {
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fappend("r%d = 0x%04x\n", i,
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b43legacy_shm_read16(dev, B43legacy_SHM_WIRELESS, i));
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}
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return count;
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}
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/* wl->irq_lock is locked */
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static ssize_t shm_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
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{
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ssize_t count = 0;
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int i;
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u16 tmp;
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__le16 *le16buf = (__le16 *)buf;
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for (i = 0; i < 0x1000; i++) {
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if (bufsize < sizeof(tmp))
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break;
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tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED, 2 * i);
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le16buf[i] = cpu_to_le16(tmp);
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count += sizeof(tmp);
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bufsize -= sizeof(tmp);
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}
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return count;
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}
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static ssize_t txstat_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
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{
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struct b43legacy_txstatus_log *log = &dev->dfsentry->txstatlog;
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ssize_t count = 0;
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unsigned long flags;
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int i, idx;
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struct b43legacy_txstatus *stat;
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spin_lock_irqsave(&log->lock, flags);
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if (log->end < 0) {
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fappend("Nothing transmitted, yet\n");
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goto out_unlock;
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}
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fappend("b43legacy TX status reports:\n\n"
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"index | cookie | seq | phy_stat | frame_count | "
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"rts_count | supp_reason | pm_indicated | "
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"intermediate | for_ampdu | acked\n" "---\n");
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i = log->end + 1;
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idx = 0;
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while (1) {
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if (i == B43legacy_NR_LOGGED_TXSTATUS)
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i = 0;
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stat = &(log->log[i]);
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if (stat->cookie) {
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fappend("%03d | "
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"0x%04X | 0x%04X | 0x%02X | "
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"0x%X | 0x%X | "
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"%u | %u | "
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"%u | %u | %u\n",
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idx,
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stat->cookie, stat->seq, stat->phy_stat,
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stat->frame_count, stat->rts_count,
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stat->supp_reason, stat->pm_indicated,
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stat->intermediate, stat->for_ampdu,
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stat->acked);
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idx++;
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}
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if (i == log->end)
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break;
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i++;
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}
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out_unlock:
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spin_unlock_irqrestore(&log->lock, flags);
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return count;
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}
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/* wl->irq_lock is locked */
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static int restart_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count)
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{
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int err = 0;
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if (count > 0 && buf[0] == '1') {
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b43legacy_controller_restart(dev, "manually restarted");
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} else
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err = -EINVAL;
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return err;
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}
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#undef fappend
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static ssize_t b43legacy_debugfs_read(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct b43legacy_wldev *dev;
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struct b43legacy_debugfs_fops *dfops;
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struct b43legacy_dfs_file *dfile;
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ssize_t ret;
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char *buf;
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const size_t bufsize = 1024 * 16; /* 16 KiB buffer */
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const size_t buforder = get_order(bufsize);
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int err = 0;
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if (!count)
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return 0;
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dev = file->private_data;
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->wl->mutex);
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if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
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err = -ENODEV;
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goto out_unlock;
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}
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dfops = container_of(debugfs_real_fops(file),
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struct b43legacy_debugfs_fops, fops);
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if (!dfops->read) {
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err = -ENOSYS;
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goto out_unlock;
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}
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dfile = fops_to_dfs_file(dev, dfops);
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if (!dfile->buffer) {
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buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
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if (!buf) {
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err = -ENOMEM;
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goto out_unlock;
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}
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memset(buf, 0, bufsize);
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if (dfops->take_irqlock) {
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spin_lock_irq(&dev->wl->irq_lock);
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ret = dfops->read(dev, buf, bufsize);
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spin_unlock_irq(&dev->wl->irq_lock);
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} else
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ret = dfops->read(dev, buf, bufsize);
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if (ret <= 0) {
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free_pages((unsigned long)buf, buforder);
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err = ret;
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goto out_unlock;
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}
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dfile->data_len = ret;
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dfile->buffer = buf;
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}
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ret = simple_read_from_buffer(userbuf, count, ppos,
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dfile->buffer,
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dfile->data_len);
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if (*ppos >= dfile->data_len) {
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free_pages((unsigned long)dfile->buffer, buforder);
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dfile->buffer = NULL;
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dfile->data_len = 0;
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}
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out_unlock:
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mutex_unlock(&dev->wl->mutex);
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return err ? err : ret;
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}
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static ssize_t b43legacy_debugfs_write(struct file *file,
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const char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct b43legacy_wldev *dev;
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struct b43legacy_debugfs_fops *dfops;
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char *buf;
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int err = 0;
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if (!count)
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return 0;
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if (count > PAGE_SIZE)
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return -E2BIG;
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dev = file->private_data;
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->wl->mutex);
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if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
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err = -ENODEV;
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goto out_unlock;
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}
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dfops = container_of(debugfs_real_fops(file),
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struct b43legacy_debugfs_fops, fops);
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if (!dfops->write) {
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err = -ENOSYS;
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goto out_unlock;
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}
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buf = (char *)get_zeroed_page(GFP_KERNEL);
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if (!buf) {
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err = -ENOMEM;
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goto out_unlock;
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}
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if (copy_from_user(buf, userbuf, count)) {
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err = -EFAULT;
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goto out_freepage;
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}
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if (dfops->take_irqlock) {
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spin_lock_irq(&dev->wl->irq_lock);
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err = dfops->write(dev, buf, count);
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spin_unlock_irq(&dev->wl->irq_lock);
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} else
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err = dfops->write(dev, buf, count);
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if (err)
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goto out_freepage;
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out_freepage:
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free_page((unsigned long)buf);
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out_unlock:
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mutex_unlock(&dev->wl->mutex);
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return err ? err : count;
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}
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#define B43legacy_DEBUGFS_FOPS(name, _read, _write, _take_irqlock) \
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static struct b43legacy_debugfs_fops fops_##name = { \
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.read = _read, \
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.write = _write, \
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.fops = { \
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.open = simple_open, \
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.read = b43legacy_debugfs_read, \
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.write = b43legacy_debugfs_write, \
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.llseek = generic_file_llseek, \
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}, \
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.file_struct_offset = offsetof(struct b43legacy_dfsentry, \
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file_##name), \
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.take_irqlock = _take_irqlock, \
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}
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B43legacy_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
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B43legacy_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
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B43legacy_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
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B43legacy_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
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B43legacy_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
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int b43legacy_debug(struct b43legacy_wldev *dev, enum b43legacy_dyndbg feature)
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{
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return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
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}
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static void b43legacy_add_dynamic_debug(struct b43legacy_wldev *dev)
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{
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struct b43legacy_dfsentry *e = dev->dfsentry;
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#define add_dyn_dbg(name, id, initstate) do { \
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e->dyn_debug[id] = (initstate); \
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debugfs_create_bool(name, 0600, e->subdir, \
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&(e->dyn_debug[id])); \
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} while (0)
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add_dyn_dbg("debug_xmitpower", B43legacy_DBG_XMITPOWER, false);
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add_dyn_dbg("debug_dmaoverflow", B43legacy_DBG_DMAOVERFLOW, false);
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add_dyn_dbg("debug_dmaverbose", B43legacy_DBG_DMAVERBOSE, false);
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add_dyn_dbg("debug_pwork_fast", B43legacy_DBG_PWORK_FAST, false);
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add_dyn_dbg("debug_pwork_stop", B43legacy_DBG_PWORK_STOP, false);
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#undef add_dyn_dbg
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}
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void b43legacy_debugfs_add_device(struct b43legacy_wldev *dev)
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{
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struct b43legacy_dfsentry *e;
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struct b43legacy_txstatus_log *log;
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char devdir[16];
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B43legacy_WARN_ON(!dev);
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e = kzalloc(sizeof(*e), GFP_KERNEL);
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if (!e) {
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b43legacyerr(dev->wl, "debugfs: add device OOM\n");
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return;
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}
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e->dev = dev;
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log = &e->txstatlog;
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log->log = kcalloc(B43legacy_NR_LOGGED_TXSTATUS,
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sizeof(struct b43legacy_txstatus), GFP_KERNEL);
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if (!log->log) {
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b43legacyerr(dev->wl, "debugfs: add device txstatus OOM\n");
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kfree(e);
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return;
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}
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log->end = -1;
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spin_lock_init(&log->lock);
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dev->dfsentry = e;
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snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
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e->subdir = debugfs_create_dir(devdir, rootdir);
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#define ADD_FILE(name, mode) \
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do { \
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debugfs_create_file(__stringify(name), mode, \
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e->subdir, dev, \
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&fops_##name.fops); \
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} while (0)
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ADD_FILE(tsf, 0600);
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ADD_FILE(ucode_regs, 0400);
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ADD_FILE(shm, 0400);
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ADD_FILE(txstat, 0400);
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ADD_FILE(restart, 0200);
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#undef ADD_FILE
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b43legacy_add_dynamic_debug(dev);
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}
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void b43legacy_debugfs_remove_device(struct b43legacy_wldev *dev)
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{
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struct b43legacy_dfsentry *e;
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if (!dev)
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return;
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e = dev->dfsentry;
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if (!e)
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return;
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debugfs_remove(e->subdir);
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kfree(e->txstatlog.log);
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kfree(e);
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}
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void b43legacy_debugfs_log_txstat(struct b43legacy_wldev *dev,
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const struct b43legacy_txstatus *status)
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{
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struct b43legacy_dfsentry *e = dev->dfsentry;
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struct b43legacy_txstatus_log *log;
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struct b43legacy_txstatus *cur;
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int i;
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if (!e)
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return;
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log = &e->txstatlog;
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B43legacy_WARN_ON(!irqs_disabled());
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spin_lock(&log->lock);
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i = log->end + 1;
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if (i == B43legacy_NR_LOGGED_TXSTATUS)
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i = 0;
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log->end = i;
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cur = &(log->log[i]);
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memcpy(cur, status, sizeof(*cur));
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spin_unlock(&log->lock);
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}
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void b43legacy_debugfs_init(void)
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{
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rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
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}
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void b43legacy_debugfs_exit(void)
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{
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debugfs_remove(rootdir);
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}
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