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Message-ID: <20120509230950.31910.6032.stgit@localhost6.localdomain6>
Date: Wed, 09 May 2012 16:09:50 -0700
From: Catherine Sullivan <catherine.sullivan@...el.com>
To: netdev@...r.kernel.org
Subject: [NET_NEXT RFC PATCH 3/3] ixgbe: added reg_ops file to debugfs
Added the reg_ops file to debugfs with commands to read and write
a register to give users the ability to read and write individual
registers on the fly.
Signed-off-by: Catherine Sullivan <catherine.sullivan@...el.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c | 112 ++++++++++++++++++++++
1 files changed, 112 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
index dfe68a9..2558014 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
@@ -34,6 +34,115 @@
static struct dentry *ixgbe_dbg_root;
+static char ixgbe_dbg_reg_ops_buf[256] = "";
+
+/**
+ * ixgbe_dbg_reg_ops_open - prep the debugfs pokee data item when opened
+ * @inode: inode that was opened
+ * @filp: file info
+ *
+ * Stash the adapter pointer hiding in the inode into the file pointer where
+ * we can find it later in the read and write calls
+ **/
+static int ixgbe_dbg_reg_ops_open(struct inode *inode, struct file *filp)
+{
+ filp->private_data = inode->i_private;
+ return 0;
+}
+
+/**
+ * ixgbe_dbg_reg_ops_read - read for reg_ops datum
+ * @filp: the opened file
+ * @buffer: where to write the data for the user to read
+ * @count: the size of the user's buffer
+ * @ppos: file position offset
+ **/
+static ssize_t ixgbe_dbg_reg_ops_read(struct file *filp, char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct ixgbe_adapter *adapter = filp->private_data;
+ char buf[256];
+ int bytes_not_copied;
+ int len;
+
+ /* don't allow partial reads */
+ if (*ppos != 0)
+ return 0;
+
+ len = snprintf(buf, sizeof(buf), "%s: %s\n",
+ adapter->netdev->name, ixgbe_dbg_reg_ops_buf);
+ if (count < len)
+ return -ENOSPC;
+ bytes_not_copied = copy_to_user(buffer, buf, len);
+ if (bytes_not_copied < 0)
+ return bytes_not_copied;
+
+ *ppos = len;
+ return len;
+}
+
+/**
+ * ixgbe_dbg_reg_ops_write - write into reg_ops datum
+ * @filp: the opened file
+ * @buffer: where to find the user's data
+ * @count: the length of the user's data
+ * @ppos: file position offset
+ **/
+static ssize_t ixgbe_dbg_reg_ops_write(struct file *filp,
+ const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct ixgbe_adapter *adapter = filp->private_data;
+ int bytes_not_copied;
+
+ /* don't allow partial writes */
+ if (*ppos != 0)
+ return 0;
+ if (count >= sizeof(ixgbe_dbg_reg_ops_buf))
+ return -ENOSPC;
+
+ bytes_not_copied = copy_from_user(ixgbe_dbg_reg_ops_buf, buffer, count);
+ if (bytes_not_copied < 0)
+ return bytes_not_copied;
+ ixgbe_dbg_reg_ops_buf[count] = '\0';
+
+ if (strncmp(ixgbe_dbg_reg_ops_buf, "write", 5) == 0) {
+ u32 reg, value;
+ int cnt;
+ cnt = sscanf(&ixgbe_dbg_reg_ops_buf[5], "%x %x", ®, &value);
+ if (cnt == 2) {
+ IXGBE_WRITE_REG(&adapter->hw, reg, value);
+ value = IXGBE_READ_REG(&adapter->hw, reg);
+ e_dev_info("write: 0x%08x = 0x%08x\n", reg, value);
+ } else {
+ e_dev_info("write reg value\n");
+ }
+ } else if (strncmp(ixgbe_dbg_reg_ops_buf, "read", 4) == 0) {
+ u32 reg, value;
+ int cnt;
+ cnt = sscanf(&ixgbe_dbg_reg_ops_buf[4], "%x", ®);
+ if (cnt == 1) {
+ value = IXGBE_READ_REG(&adapter->hw, reg);
+ e_dev_info("read 0x%08x = 0x%08x\n", reg, value);
+ } else {
+ e_dev_info("read reg\n");
+ }
+ } else {
+ e_dev_info("Unknown command %s\n", ixgbe_dbg_reg_ops_buf);
+ e_dev_info("Available commands:\n");
+ e_dev_info(" read reg\n");
+ e_dev_info(" write reg value\n");
+ }
+ return count;
+}
+
+static const struct file_operations ixgbe_dbg_reg_ops_fops = {
+ .owner = THIS_MODULE,
+ .open = ixgbe_dbg_reg_ops_open,
+ .read = ixgbe_dbg_reg_ops_read,
+ .write = ixgbe_dbg_reg_ops_write,
+};
+
static char ixgbe_dbg_netdev_ops_buf[256] = "";
/**
@@ -141,6 +250,9 @@ void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter)
struct dentry *pfile;
adapter->ixgbe_dbg_adapter = debugfs_create_dir(name, ixgbe_dbg_root);
if (adapter->ixgbe_dbg_adapter) {
+ pfile = debugfs_create_file("reg_ops", 0600,
+ adapter->ixgbe_dbg_adapter, adapter,
+ &ixgbe_dbg_reg_ops_fops);
pfile = debugfs_create_file("netdev_ops", 0600,
adapter->ixgbe_dbg_adapter, adapter,
&ixgbe_dbg_netdev_ops_fops);
--
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