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authorLogan Gunthorpe <logang@deltatee.com>2016-06-20 22:15:10 +0300
committerJon Mason <jdmason@kudzu.us>2016-08-05 17:21:07 +0300
commitbfcaa39652bf64294261415e5fa18ef0445a4d74 (patch)
tree7bfc6fd71823bdf697dc64d3ed51e76c3eae7fea
parent717146a2a8cbf6dbcb8fdf4ae7cddd2d6074161c (diff)
downloadlinux-bfcaa39652bf64294261415e5fa18ef0445a4d74.tar.xz
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: Logan Gunthorpe <logang@deltatee.com> Acked-by: Allen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
-rw-r--r--drivers/ntb/test/ntb_tool.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index 1509b4c1f204..61bf2ef87e0e 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -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++) {