Commit bfcaa396 authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Jon Mason
Browse files

ntb_tool: Add link status and files to debugfs 



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: default avatarLogan Gunthorpe <logang@deltatee.com>
Acked-by: default avatarAllen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: default avatarJon Mason <jdmason@kudzu.us>
parent 717146a2

drivers/ntb/test/ntb_tool.c

+92 −0
Original line number Diff line number Diff line
@@ -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++) {

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