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Commit 20572ee1 authored by Logan Gunthorpe's avatar Logan Gunthorpe Committed by Jon Mason
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ntb_pingpong: Add a debugfs file to get the ping count 



This commit adds a debugfs 'count' file to ntb_pingpong. This is so
testing with ntb_pingpong can be automated beyond just checking the
logs for pong messages.

The count file returns a number which increments every pong. The
counter can be cleared by writing a zero.

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 bfcaa396

drivers/ntb/test/ntb_pingpong.c

+61 −1
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ 
#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/debugfs.h>



#include <linux/ntb.h>
@@ -96,8 +97,13 @@ struct pp_ctx { 
	spinlock_t			db_lock;

	struct timer_list		db_timer;

	unsigned long			db_delay;

	struct dentry			*debugfs_node_dir;

	struct dentry			*debugfs_count;

	atomic_t			count;

};



static struct dentry *pp_debugfs_dir;



static void pp_ping(unsigned long ctx)

{

	struct pp_ctx *pp = (void *)ctx;
@@ -171,10 +177,32 @@ static void pp_db_event(void *ctx, int vec) 
		dev_dbg(&pp->ntb->dev,

			"Pong vec %d bits %#llx\n",

			vec, db_bits);

		atomic_inc(&pp->count);

	}

	spin_unlock_irqrestore(&pp->db_lock, irqflags);

}



static int pp_debugfs_setup(struct pp_ctx *pp)

{

	struct pci_dev *pdev = pp->ntb->pdev;



	if (!pp_debugfs_dir)

		return -ENODEV;



	pp->debugfs_node_dir = debugfs_create_dir(pci_name(pdev),

						  pp_debugfs_dir);

	if (!pp->debugfs_node_dir)

		return -ENODEV;



	pp->debugfs_count = debugfs_create_atomic_t("count", S_IRUSR | S_IWUSR,

						    pp->debugfs_node_dir,

						    &pp->count);

	if (!pp->debugfs_count)

		return -ENODEV;



	return 0;

}



static const struct ntb_ctx_ops pp_ops = {

	.link_event = pp_link_event,

	.db_event = pp_db_event,
@@ -210,6 +238,7 @@ static int pp_probe(struct ntb_client *client, 


	pp->ntb = ntb;

	pp->db_bits = 0;

	atomic_set(&pp->count, 0);

	spin_lock_init(&pp->db_lock);

	setup_timer(&pp->db_timer, pp_ping, (unsigned long)pp);

	pp->db_delay = msecs_to_jiffies(delay_ms);
@@ -218,6 +247,10 @@ static int pp_probe(struct ntb_client *client, 
	if (rc)

		goto err_ctx;



	rc = pp_debugfs_setup(pp);

	if (rc)

		goto err_ctx;



	ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);

	ntb_link_event(ntb);
@@ -234,6 +267,8 @@ static void pp_remove(struct ntb_client *client, 
{

	struct pp_ctx *pp = ntb->ctx;



	debugfs_remove_recursive(pp->debugfs_node_dir);



	ntb_clear_ctx(ntb);

	del_timer_sync(&pp->db_timer);

	ntb_link_disable(ntb);
@@ -247,4 +282,29 @@ static struct ntb_client pp_client = { 
		.remove = pp_remove,

	},

};

module_ntb_client(pp_client);
 


static int __init pp_init(void)

{

	int rc;



	if (debugfs_initialized())

		pp_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);



	rc = ntb_register_client(&pp_client);

	if (rc)

		goto err_client;



	return 0;



err_client:

	debugfs_remove_recursive(pp_debugfs_dir);

	return rc;

}

module_init(pp_init);



static void __exit pp_exit(void)

{

	ntb_unregister_client(&pp_client);

	debugfs_remove_recursive(pp_debugfs_dir);

}

module_exit(pp_exit);