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ath6kl: add blocking debugfs file for retrieving firmware logs

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When debugging firmware issues it's not always enough to get
the latest firmware logs, sometimes we need to get logs from a longer
period. To make this possible, add a debugfs file named fwlog_block. When
reading from this file ath6kl will send firmware logs whenever available
and otherwise it will block and wait for new logs.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Kalle Valo 2012-02-06 08:23:40 +02:00
parent 9b9a4f2aca
commit c807b30d25
2 changed files with 106 additions and 1 deletions
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3
drivers/net/wireless/ath/ath6kl/core.h
View File

@ -653,6 +653,9 @@ struct ath6kl {
#ifdef CONFIG_ATH6KL_DEBUG
struct {
struct sk_buff_head fwlog_queue;
struct completion fwlog_completion;
bool fwlog_open;
u32 fwlog_mask;
unsigned int dbgfs_diag_reg;

104
drivers/net/wireless/ath/ath6kl/debug.c
View File

@ -290,6 +290,7 @@ void ath6kl_debug_fwlog_event(struct ath6kl *ar, const void *buf, size_t len)
spin_lock(&ar->debug.fwlog_queue.lock);
__skb_queue_tail(&ar->debug.fwlog_queue, skb);
complete(&ar->debug.fwlog_completion);
/* drop oldest entries */
while (skb_queue_len(&ar->debug.fwlog_queue) >
@ -303,6 +304,28 @@ void ath6kl_debug_fwlog_event(struct ath6kl *ar, const void *buf, size_t len)
return;
}
static int ath6kl_fwlog_open(struct inode *inode, struct file *file)
{
struct ath6kl *ar = inode->i_private;
if (ar->debug.fwlog_open)
return -EBUSY;
ar->debug.fwlog_open = true;
file->private_data = inode->i_private;
return 0;
}
static int ath6kl_fwlog_release(struct inode *inode, struct file *file)
{
struct ath6kl *ar = inode->i_private;
ar->debug.fwlog_open = false;
return 0;
}
static ssize_t ath6kl_fwlog_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
@ -347,12 +370,87 @@ static ssize_t ath6kl_fwlog_read(struct file *file, char __user *user_buf,
}
static const struct file_operations fops_fwlog = {
.open = ath6kl_debugfs_open,
.open = ath6kl_fwlog_open,
.release = ath6kl_fwlog_release,
.read = ath6kl_fwlog_read,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
static ssize_t ath6kl_fwlog_block_read(struct file *file,
char __user *user_buf,
size_t count,
loff_t *ppos)
{
struct ath6kl *ar = file->private_data;
struct sk_buff *skb;
ssize_t ret_cnt;
size_t len = 0, not_copied;
char *buf;
int ret;
buf = vmalloc(count);
if (!buf)
return -ENOMEM;
spin_lock(&ar->debug.fwlog_queue.lock);
if (skb_queue_len(&ar->debug.fwlog_queue) == 0) {
/* we must init under queue lock */
init_completion(&ar->debug.fwlog_completion);
spin_unlock(&ar->debug.fwlog_queue.lock);
ret = wait_for_completion_interruptible(
&ar->debug.fwlog_completion);
if (ret == -ERESTARTSYS)
return ret;
spin_lock(&ar->debug.fwlog_queue.lock);
}
while ((skb = __skb_dequeue(&ar->debug.fwlog_queue))) {
if (skb->len > count - len) {
/* not enough space, put skb back and leave */
__skb_queue_head(&ar->debug.fwlog_queue, skb);
break;
}
memcpy(buf + len, skb->data, skb->len);
len += skb->len;
kfree_skb(skb);
}
spin_unlock(&ar->debug.fwlog_queue.lock);
/* FIXME: what to do if len == 0? */
not_copied = copy_to_user(user_buf, buf, len);
if (not_copied != 0) {
ret_cnt = -EFAULT;
goto out;
}
*ppos = *ppos + len;
ret_cnt = len;
out:
vfree(buf);
return ret_cnt;
}
static const struct file_operations fops_fwlog_block = {
.open = ath6kl_fwlog_open,
.release = ath6kl_fwlog_release,
.read = ath6kl_fwlog_block_read,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
static ssize_t ath6kl_fwlog_mask_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
@ -1623,6 +1721,7 @@ static const struct file_operations fops_power_params = {
int ath6kl_debug_init(struct ath6kl *ar)
{
skb_queue_head_init(&ar->debug.fwlog_queue);
init_completion(&ar->debug.fwlog_completion);
/*
* Actually we are lying here but don't know how to read the mask
@ -1647,6 +1746,9 @@ int ath6kl_debug_init(struct ath6kl *ar)
debugfs_create_file("fwlog", S_IRUSR, ar->debugfs_phy, ar,
&fops_fwlog);
debugfs_create_file("fwlog_block", S_IRUSR, ar->debugfs_phy, ar,
&fops_fwlog_block);
debugfs_create_file("fwlog_mask", S_IRUSR | S_IWUSR, ar->debugfs_phy,
ar, &fops_fwlog_mask);