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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: 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 13:15:11 -06:00 committed by Jon Mason
parent bfcaa39652
commit 20572ee1c5
1 changed files with 61 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/ntb/test/ntb_pingpong.c
View File

@ -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);