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@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 118 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
index 2dd169ee5e68..8d3a21889099 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
@@ -34,6 +34,119 @@
 
 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;
+        else if (bytes_not_copied < count)
+                count -= bytes_not_copied;
+        else
+                return -ENOSPC;
+        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", &reg, &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", &reg);
+                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] = "";
 
 /**
@@ -140,6 +253,11 @@ 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);
+                if (!pfile)
+                        e_dev_err("debugfs reg_ops for %s failed\n", name);
                 pfile = debugfs_create_file("netdev_ops", 0600,
                                             adapter->ixgbe_dbg_adapter, adapter,
                                             &ixgbe_dbg_netdev_ops_fops);