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ntb_tool: Add link status and files to debugfs

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In order to more successfully script with ntb_tool it's useful to
have a link file to check the link status so that the script
doesn't use the other files until the link is up.

This commit adds a 'link' file to the debugfs directory which reads
boolean (Y or N) depending on the link status. Writing to the file
change the link state using ntb_link_enable or ntb_link_disable.

A 'link_event' file is also provided so an application can block until
the link changes to the desired state. If the user writes a 1, it will
block until the link is up. If the user writes a 0, it will block until
the link is down.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2016-06-20 13:15:10 -06:00 committed by Jon Mason
parent 717146a2a8
commit bfcaa39652
1 changed files with 92 additions and 0 deletions
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92
drivers/ntb/test/ntb_tool.c
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@ -59,6 +59,12 @@
*
* Eg: check if clearing the doorbell mask generates an interrupt.
*
* # Check the link status
* root@self# cat $DBG_DIR/link
*
* # Block until the link is up
* root@self# echo Y > $DBG_DIR/link_event
*
* # Set the doorbell mask
* root@self# echo 's 1' > $DBG_DIR/mask
*
@ -131,6 +137,7 @@ struct tool_mw {
struct tool_ctx {
struct ntb_dev *ntb;
struct dentry *dbgfs;
wait_queue_head_t link_wq;
int mw_count;
struct tool_mw mws[MAX_MWS];
};
@ -159,6 +166,7 @@ static void tool_link_event(void *ctx)
dev_dbg(&tc->ntb->dev, "link is %s speed %d width %d\n",
up ? "up" : "down", speed, width);
wake_up(&tc->link_wq);
}
static void tool_db_event(void *ctx, int vec)
@ -473,6 +481,83 @@ static TOOL_FOPS_RDWR(tool_peer_spad_fops,
tool_peer_spad_read,
tool_peer_spad_write);
static ssize_t tool_link_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
char buf[3];
buf[0] = ntb_link_is_up(tc->ntb, NULL, NULL) ? 'Y' : 'N';
buf[1] = '\n';
buf[2] = '\0';
return simple_read_from_buffer(ubuf, size, offp, buf, 2);
}
static ssize_t tool_link_write(struct file *filep, const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
char buf[32];
size_t buf_size;
bool val;
int rc;
buf_size = min(size, (sizeof(buf) - 1));
if (copy_from_user(buf, ubuf, buf_size))
return -EFAULT;
buf[buf_size] = '\0';
rc = strtobool(buf, &val);
if (rc)
return rc;
if (val)
rc = ntb_link_enable(tc->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
else
rc = ntb_link_disable(tc->ntb);
if (rc)
return rc;
return size;
}
static TOOL_FOPS_RDWR(tool_link_fops,
tool_link_read,
tool_link_write);
static ssize_t tool_link_event_write(struct file *filep,
const char __user *ubuf,
size_t size, loff_t *offp)
{
struct tool_ctx *tc = filep->private_data;
char buf[32];
size_t buf_size;
bool val;
int rc;
buf_size = min(size, (sizeof(buf) - 1));
if (copy_from_user(buf, ubuf, buf_size))
return -EFAULT;
buf[buf_size] = '\0';
rc = strtobool(buf, &val);
if (rc)
return rc;
if (wait_event_interruptible(tc->link_wq,
ntb_link_is_up(tc->ntb, NULL, NULL) == val))
return -ERESTART;
return size;
}
static TOOL_FOPS_RDWR(tool_link_event_fops,
NULL,
tool_link_event_write);
static ssize_t tool_mw_read(struct file *filep, char __user *ubuf,
size_t size, loff_t *offp)
@ -803,6 +888,12 @@ static void tool_setup_dbgfs(struct tool_ctx *tc)
debugfs_create_file("peer_spad", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_peer_spad_fops);
debugfs_create_file("link", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_link_fops);
debugfs_create_file("link_event", S_IWUSR, tc->dbgfs,
tc, &tool_link_event_fops);
for (i = 0; i < tc->mw_count; i++) {
char buf[30];
@ -835,6 +926,7 @@ static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb)
}
tc->ntb = ntb;
init_waitqueue_head(&tc->link_wq);
tc->mw_count = min(ntb_mw_count(tc->ntb), MAX_MWS);
for (i = 0; i < tc->mw_count; i++) {