drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 1999 - 2018 Intel Corporation. */
   3
   4 #include <linux/debugfs.h>
   5 #include <linux/module.h>
   6
   7 #include "ixgbe.h"
   8
   9 static struct dentry *ixgbe_dbg_root;
  10
  11 static char ixgbe_dbg_reg_ops_buf[256] = "";
  12
  13 static ssize_t ixgbe_dbg_common_ops_read(struct file *filp, char __user *buffer,
  14                                          size_t count, loff_t *ppos,
  15                                          char *dbg_buf)
  16 {
  17         struct ixgbe_adapter *adapter = filp->private_data;
  18         char *buf;
  19         int len;
  20
  21         /* don't allow partial reads */
  22         if (*ppos != 0)
  23                 return 0;
  24
  25         buf = kasprintf(GFP_KERNEL, "%s: %s\n",
  26                         adapter->netdev->name, dbg_buf);
  27         if (!buf)
  28                 return -ENOMEM;
  29
  30         if (count < strlen(buf)) {
  31                 kfree(buf);
  32                 return -ENOSPC;
  33         }
  34
  35         len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
  36
  37         kfree(buf);
  38         return len;
  39 }
  40
  41 /**
  42  * ixgbe_dbg_reg_ops_read - read for reg_ops datum
  43  * @filp: the opened file
  44  * @buffer: where to write the data for the user to read
  45  * @count: the size of the user's buffer
  46  * @ppos: file position offset
  47  **/
  48 static ssize_t ixgbe_dbg_reg_ops_read(struct file *filp, char __user *buffer,
  49                                       size_t count, loff_t *ppos)
  50 {
  51         return ixgbe_dbg_common_ops_read(filp, buffer, count, ppos,
  52                                          ixgbe_dbg_reg_ops_buf);
  53 }
  54
  55 /**
  56  * ixgbe_dbg_reg_ops_write - write into reg_ops datum
  57  * @filp: the opened file
  58  * @buffer: where to find the user's data
  59  * @count: the length of the user's data
  60  * @ppos: file position offset
  61  **/
  62 static ssize_t ixgbe_dbg_reg_ops_write(struct file *filp,
  63                                      const char __user *buffer,
  64                                      size_t count, loff_t *ppos)
  65 {
  66         struct ixgbe_adapter *adapter = filp->private_data;
  67         int len;
  68
  69         /* don't allow partial writes */
  70         if (*ppos != 0)
  71                 return 0;
  72         if (count >= sizeof(ixgbe_dbg_reg_ops_buf))
  73                 return -ENOSPC;
  74
  75         len = simple_write_to_buffer(ixgbe_dbg_reg_ops_buf,
  76                                      sizeof(ixgbe_dbg_reg_ops_buf)-1,
  77                                      ppos,
  78                                      buffer,
  79                                      count);
  80         if (len < 0)
  81                 return len;
  82
  83         ixgbe_dbg_reg_ops_buf[len] = '\0';
  84
  85         if (strncmp(ixgbe_dbg_reg_ops_buf, "write", 5) == 0) {
  86                 u32 reg, value;
  87                 int cnt;
  88                 cnt = sscanf(&ixgbe_dbg_reg_ops_buf[5], "%x %x", &reg, &value);
  89                 if (cnt == 2) {
  90                         IXGBE_WRITE_REG(&adapter->hw, reg, value);
  91                         value = IXGBE_READ_REG(&adapter->hw, reg);
  92                         e_dev_info("write: 0x%08x = 0x%08x\n", reg, value);
  93                 } else {
  94                         e_dev_info("write <reg> <value>\n");
  95                 }
  96         } else if (strncmp(ixgbe_dbg_reg_ops_buf, "read", 4) == 0) {
  97                 u32 reg, value;
  98                 int cnt;
  99                 cnt = sscanf(&ixgbe_dbg_reg_ops_buf[4], "%x", &reg);
 100                 if (cnt == 1) {
 101                         value = IXGBE_READ_REG(&adapter->hw, reg);
 102                         e_dev_info("read 0x%08x = 0x%08x\n", reg, value);
 103                 } else {
 104                         e_dev_info("read <reg>\n");
 105                 }
 106         } else {
 107                 e_dev_info("Unknown command %s\n", ixgbe_dbg_reg_ops_buf);
 108                 e_dev_info("Available commands:\n");
 109                 e_dev_info("   read <reg>\n");
 110                 e_dev_info("   write <reg> <value>\n");
 111         }
 112         return count;
 113 }
 114
 115 static const struct file_operations ixgbe_dbg_reg_ops_fops = {
 116         .owner = THIS_MODULE,
 117         .open = simple_open,
 118         .read =  ixgbe_dbg_reg_ops_read,
 119         .write = ixgbe_dbg_reg_ops_write,
 120 };
 121
 122 static char ixgbe_dbg_netdev_ops_buf[256] = "";
 123
 124 /**
 125  * ixgbe_dbg_netdev_ops_read - read for netdev_ops datum
 126  * @filp: the opened file
 127  * @buffer: where to write the data for the user to read
 128  * @count: the size of the user's buffer
 129  * @ppos: file position offset
 130  **/
 131 static ssize_t ixgbe_dbg_netdev_ops_read(struct file *filp, char __user *buffer,
 132                                          size_t count, loff_t *ppos)
 133 {
 134         return ixgbe_dbg_common_ops_read(filp, buffer, count, ppos,
 135                                          ixgbe_dbg_netdev_ops_buf);
 136 }
 137
 138 /**
 139  * ixgbe_dbg_netdev_ops_write - write into netdev_ops datum
 140  * @filp: the opened file
 141  * @buffer: where to find the user's data
 142  * @count: the length of the user's data
 143  * @ppos: file position offset
 144  **/
 145 static ssize_t ixgbe_dbg_netdev_ops_write(struct file *filp,
 146                                           const char __user *buffer,
 147                                           size_t count, loff_t *ppos)
 148 {
 149         struct ixgbe_adapter *adapter = filp->private_data;
 150         int len;
 151
 152         /* don't allow partial writes */
 153         if (*ppos != 0)
 154                 return 0;
 155         if (count >= sizeof(ixgbe_dbg_netdev_ops_buf))
 156                 return -ENOSPC;
 157
 158         len = simple_write_to_buffer(ixgbe_dbg_netdev_ops_buf,
 159                                      sizeof(ixgbe_dbg_netdev_ops_buf)-1,
 160                                      ppos,
 161                                      buffer,
 162                                      count);
 163         if (len < 0)
 164                 return len;
 165
 166         ixgbe_dbg_netdev_ops_buf[len] = '\0';
 167
 168         if (strncmp(ixgbe_dbg_netdev_ops_buf, "tx_timeout", 10) == 0) {
 169                 /* TX Queue number below is wrong, but ixgbe does not use it */
 170                 adapter->netdev->netdev_ops->ndo_tx_timeout(adapter->netdev,
 171                                                             UINT_MAX);
 172                 e_dev_info("tx_timeout called\n");
 173         } else {
 174                 e_dev_info("Unknown command: %s\n", ixgbe_dbg_netdev_ops_buf);
 175                 e_dev_info("Available commands:\n");
 176                 e_dev_info("    tx_timeout\n");
 177         }
 178         return count;
 179 }
 180
 181 static const struct file_operations ixgbe_dbg_netdev_ops_fops = {
 182         .owner = THIS_MODULE,
 183         .open = simple_open,
 184         .read = ixgbe_dbg_netdev_ops_read,
 185         .write = ixgbe_dbg_netdev_ops_write,
 186 };
 187
 188 /**
 189  * ixgbe_dbg_adapter_init - setup the debugfs directory for the adapter
 190  * @adapter: the adapter that is starting up
 191  **/
 192 void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter)
 193 {
 194         const char *name = pci_name(adapter->pdev);
 195
 196         adapter->ixgbe_dbg_adapter = debugfs_create_dir(name, ixgbe_dbg_root);
 197         debugfs_create_file("reg_ops", 0600, adapter->ixgbe_dbg_adapter,
 198                             adapter, &ixgbe_dbg_reg_ops_fops);
 199         debugfs_create_file("netdev_ops", 0600, adapter->ixgbe_dbg_adapter,
 200                             adapter, &ixgbe_dbg_netdev_ops_fops);
 201 }
 202
 203 /**
 204  * ixgbe_dbg_adapter_exit - clear out the adapter's debugfs entries
 205  * @adapter: the adapter that is exiting
 206  **/
 207 void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter)
 208 {
 209         debugfs_remove_recursive(adapter->ixgbe_dbg_adapter);
 210         adapter->ixgbe_dbg_adapter = NULL;
 211 }
 212
 213 /**
 214  * ixgbe_dbg_init - start up debugfs for the driver
 215  **/
 216 void ixgbe_dbg_init(void)
 217 {
 218         ixgbe_dbg_root = debugfs_create_dir(ixgbe_driver_name, NULL);
 219 }
 220
 221 /**
 222  * ixgbe_dbg_exit - clean out the driver's debugfs entries
 223  **/
 224 void ixgbe_dbg_exit(void)
 225 {
 226         debugfs_remove_recursive(ixgbe_dbg_root);
 227 }