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", ®, &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", ®); 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 } 228