debugfs.c

linux内核源码

	fappend("\nUsed Baseband attenuation values:\n");
	for (i = 0; i < lo->bbatt_list.len; i++) {
		fappend("%u, ",
			lo->bbatt_list.list[i].att);
	}
	fappend("\n");

out:
	return err ? err : count;
}

#undef fappend

static int b43_debugfs_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf,
				size_t count, loff_t *ppos)
{
	struct b43_wldev *dev;
	struct b43_debugfs_fops *dfops;
	struct b43_dfs_file *dfile;
	ssize_t ret;
	char *buf;
	const size_t bufsize = 1024 * 128;
	const size_t buforder = get_order(bufsize);
	int err = 0;

	if (!count)
		return 0;
	dev = file->private_data;
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->wl->mutex);
	if (b43_status(dev) < B43_STAT_INITIALIZED) {
		err = -ENODEV;
		goto out_unlock;
	}

	dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
	if (!dfops->read) {
		err = -ENOSYS;
		goto out_unlock;
	}
	dfile = fops_to_dfs_file(dev, dfops);

	if (!dfile->buffer) {
		buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
		if (!buf) {
			err = -ENOMEM;
			goto out_unlock;
		}
		/* Sparse warns about the following memset, because it has a big
		 * size value. That warning is bogus, so I will ignore it. --mb */
		memset(buf, 0, bufsize);
		if (dfops->take_irqlock) {
			spin_lock_irq(&dev->wl->irq_lock);
			ret = dfops->read(dev, buf, bufsize);
			spin_unlock_irq(&dev->wl->irq_lock);
		} else
			ret = dfops->read(dev, buf, bufsize);
		if (ret <= 0) {
			free_pages((unsigned long)buf, buforder);
			err = ret;
			goto out_unlock;
		}
		dfile->data_len = ret;
		dfile->buffer = buf;
	}

	ret = simple_read_from_buffer(userbuf, count, ppos,
				      dfile->buffer,
				      dfile->data_len);
	if (*ppos >= dfile->data_len) {
		free_pages((unsigned long)dfile->buffer, buforder);
		dfile->buffer = NULL;
		dfile->data_len = 0;
	}
out_unlock:
	mutex_unlock(&dev->wl->mutex);

	return err ? err : ret;
}

static ssize_t b43_debugfs_write(struct file *file,
				 const char __user *userbuf,
				 size_t count, loff_t *ppos)
{
	struct b43_wldev *dev;
	struct b43_debugfs_fops *dfops;
	char *buf;
	int err = 0;

	if (!count)
		return 0;
	if (count > PAGE_SIZE)
		return -E2BIG;
	dev = file->private_data;
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->wl->mutex);
	if (b43_status(dev) < B43_STAT_INITIALIZED) {
		err = -ENODEV;
		goto out_unlock;
	}

	dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
	if (!dfops->write) {
		err = -ENOSYS;
		goto out_unlock;
	}

	buf = (char *)get_zeroed_page(GFP_KERNEL);
	if (!buf) {
		err = -ENOMEM;
		goto out_unlock;
	}
	if (copy_from_user(buf, userbuf, count)) {
		err = -EFAULT;
		goto out_freepage;
	}
	if (dfops->take_irqlock) {
		spin_lock_irq(&dev->wl->irq_lock);
		err = dfops->write(dev, buf, count);
		spin_unlock_irq(&dev->wl->irq_lock);
	} else
		err = dfops->write(dev, buf, count);
	if (err)
		goto out_freepage;

out_freepage:
	free_page((unsigned long)buf);
out_unlock:
	mutex_unlock(&dev->wl->mutex);

	return err ? err : count;
}


#define B43_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)	\
	static struct b43_debugfs_fops fops_##name = {		\
		.read	= _read,				\
		.write	= _write,				\
		.fops	= {					\
			.open	= b43_debugfs_open,		\
			.read	= b43_debugfs_read,		\
			.write	= b43_debugfs_write,		\
		},						\
		.file_struct_offset = offsetof(struct b43_dfsentry, \
					       file_##name),	\
		.take_irqlock	= _take_irqlock,		\
	}

B43_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
B43_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
B43_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
B43_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
B43_DEBUGFS_FOPS(txpower_g, txpower_g_read_file, txpower_g_write_file, 0);
B43_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
B43_DEBUGFS_FOPS(loctls, loctls_read_file, NULL, 0);


int b43_debug(struct b43_wldev *dev, enum b43_dyndbg feature)
{
	return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
}

static void b43_remove_dynamic_debug(struct b43_wldev *dev)
{
	struct b43_dfsentry *e = dev->dfsentry;
	int i;

	for (i = 0; i < __B43_NR_DYNDBG; i++)
		debugfs_remove(e->dyn_debug_dentries[i]);
}

static void b43_add_dynamic_debug(struct b43_wldev *dev)
{
	struct b43_dfsentry *e = dev->dfsentry;
	struct dentry *d;

#define add_dyn_dbg(name, id, initstate) do {		\
	e->dyn_debug[id] = (initstate);			\
	d = debugfs_create_bool(name, 0600, e->subdir,	\
				&(e->dyn_debug[id]));	\
	if (!IS_ERR(d))					\
		e->dyn_debug_dentries[id] = d;		\
				} while (0)

	add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, 0);
	add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, 0);
	add_dyn_dbg("debug_dmaverbose", B43_DBG_DMAVERBOSE, 0);
	add_dyn_dbg("debug_pwork_fast", B43_DBG_PWORK_FAST, 0);
	add_dyn_dbg("debug_pwork_stop", B43_DBG_PWORK_STOP, 0);

#undef add_dyn_dbg
}

void b43_debugfs_add_device(struct b43_wldev *dev)
{
	struct b43_dfsentry *e;
	struct b43_txstatus_log *log;
	char devdir[16];

	B43_WARN_ON(!dev);
	e = kzalloc(sizeof(*e), GFP_KERNEL);
	if (!e) {
		b43err(dev->wl, "debugfs: add device OOM\n");
		return;
	}
	e->dev = dev;
	log = &e->txstatlog;
	log->log = kcalloc(B43_NR_LOGGED_TXSTATUS,
			   sizeof(struct b43_txstatus), GFP_KERNEL);
	if (!log->log) {
		b43err(dev->wl, "debugfs: add device txstatus OOM\n");
		kfree(e);
		return;
	}
	log->end = -1;
	spin_lock_init(&log->lock);

	dev->dfsentry = e;

	snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
	e->subdir = debugfs_create_dir(devdir, rootdir);
	if (!e->subdir || IS_ERR(e->subdir)) {
		if (e->subdir == ERR_PTR(-ENODEV)) {
			b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
			       "enabled in kernel config\n");
		} else {
			b43err(dev->wl, "debugfs: cannot create %s directory\n",
			       devdir);
		}
		dev->dfsentry = NULL;
		kfree(log->log);
		kfree(e);
		return;
	}

#define ADD_FILE(name, mode)	\
	do {							\
		struct dentry *d;				\
		d = debugfs_create_file(__stringify(name),	\
					mode, e->subdir, dev,	\
					&fops_##name.fops);	\
		e->file_##name.dentry = NULL;			\
		if (!IS_ERR(d))					\
			e->file_##name.dentry = d;		\
	} while (0)


	ADD_FILE(tsf, 0600);
	ADD_FILE(ucode_regs, 0400);
	ADD_FILE(shm, 0400);
	ADD_FILE(txstat, 0400);
	ADD_FILE(txpower_g, 0600);
	ADD_FILE(restart, 0200);
	ADD_FILE(loctls, 0400);

#undef ADD_FILE

	b43_add_dynamic_debug(dev);
}

void b43_debugfs_remove_device(struct b43_wldev *dev)
{
	struct b43_dfsentry *e;

	if (!dev)
		return;
	e = dev->dfsentry;
	if (!e)
		return;
	b43_remove_dynamic_debug(dev);

	debugfs_remove(e->file_tsf.dentry);
	debugfs_remove(e->file_ucode_regs.dentry);
	debugfs_remove(e->file_shm.dentry);
	debugfs_remove(e->file_txstat.dentry);
	debugfs_remove(e->file_txpower_g.dentry);
	debugfs_remove(e->file_restart.dentry);
	debugfs_remove(e->file_loctls.dentry);

	debugfs_remove(e->subdir);
	kfree(e->txstatlog.log);
	kfree(e);
}

void b43_debugfs_log_txstat(struct b43_wldev *dev,
			    const struct b43_txstatus *status)
{
	struct b43_dfsentry *e = dev->dfsentry;
	struct b43_txstatus_log *log;
	struct b43_txstatus *cur;
	int i;

	if (!e)
		return;
	log = &e->txstatlog;
	B43_WARN_ON(!irqs_disabled());
	spin_lock(&log->lock);
	i = log->end + 1;
	if (i == B43_NR_LOGGED_TXSTATUS)
		i = 0;
	log->end = i;
	cur = &(log->log[i]);
	memcpy(cur, status, sizeof(*cur));
	spin_unlock(&log->lock);
}

void b43_debugfs_init(void)
{
	rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
	if (IS_ERR(rootdir))
		rootdir = NULL;
}

void b43_debugfs_exit(void)
{
	debugfs_remove(rootdir);
}