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 /** 14 * ixgbe_dbg_reg_ops_read - read for reg_ops datum 15 * @filp: the opened file 16 * @buffer: where to write the data for the user to read 17 * @count: the size of the user's buffer 18 * @ppos: file position offset 19 **/ 20 static ssize_t ixgbe_dbg_reg_ops_read(struct file *filp, char __user *buffer, 21 size_t count, loff_t *ppos) 22 { 23 struct ixgbe_adapter *adapter = filp->private_data; 24 char *buf; 25 int len; 26 27 /* don't allow partial reads */ 28 if (*ppos != 0) 29 return 0; 30 31 buf = kasprintf(GFP_KERNEL, "%s: %s\n", 32 adapter->netdev->name, 33 ixgbe_dbg_reg_ops_buf); 34 if (!buf) 35 return -ENOMEM; 36 37 if (count < strlen(buf)) { 38 kfree(buf); 39 return -ENOSPC; 40 } 41 42 len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 43 44 kfree(buf); 45 return len; 46 } 47 48 /** 49 * ixgbe_dbg_reg_ops_write - write into reg_ops datum 50 * @filp: the opened file 51 * @buffer: where to find the user's data 52 * @count: the length of the user's data 53 * @ppos: file position offset 54 **/ 55 static ssize_t ixgbe_dbg_reg_ops_write(struct file *filp, 56 const char __user *buffer, 57 size_t count, loff_t *ppos) 58 { 59 struct ixgbe_adapter *adapter = filp->private_data; 60 int len; 61 62 /* don't allow partial writes */ 63 if (*ppos != 0) 64 return 0; 65 if (count >= sizeof(ixgbe_dbg_reg_ops_buf)) 66 return -ENOSPC; 67 68 len = simple_write_to_buffer(ixgbe_dbg_reg_ops_buf, 69 sizeof(ixgbe_dbg_reg_ops_buf)-1, 70 ppos, 71 buffer, 72 count); 73 if (len < 0) 74 return len; 75 76 ixgbe_dbg_reg_ops_buf[len] = '\0'; 77 78 if (strncmp(ixgbe_dbg_reg_ops_buf, "write", 5) == 0) { 79 u32 reg, value; 80 int cnt; 81 cnt = sscanf(&ixgbe_dbg_reg_ops_buf[5], "%x %x", ®, &value); 82 if (cnt == 2) { 83 IXGBE_WRITE_REG(&adapter->hw, reg, value); 84 value = IXGBE_READ_REG(&adapter->hw, reg); 85 e_dev_info("write: 0x%08x = 0x%08x\n", reg, value); 86 } else { 87 e_dev_info("write <reg> <value>\n"); 88 } 89 } else if (strncmp(ixgbe_dbg_reg_ops_buf, "read", 4) == 0) { 90 u32 reg, value; 91 int cnt; 92 cnt = sscanf(&ixgbe_dbg_reg_ops_buf[4], "%x", ®); 93 if (cnt == 1) { 94 value = IXGBE_READ_REG(&adapter->hw, reg); 95 e_dev_info("read 0x%08x = 0x%08x\n", reg, value); 96 } else { 97 e_dev_info("read <reg>\n"); 98 } 99 } else { 100 e_dev_info("Unknown command %s\n", ixgbe_dbg_reg_ops_buf); 101 e_dev_info("Available commands:\n"); 102 e_dev_info(" read <reg>\n"); 103 e_dev_info(" write <reg> <value>\n"); 104 } 105 return count; 106 } 107 108 static const struct file_operations ixgbe_dbg_reg_ops_fops = { 109 .owner = THIS_MODULE, 110 .open = simple_open, 111 .read = ixgbe_dbg_reg_ops_read, 112 .write = ixgbe_dbg_reg_ops_write, 113 }; 114 115 static char ixgbe_dbg_netdev_ops_buf[256] = ""; 116 117 /** 118 * ixgbe_dbg_netdev_ops_read - read for netdev_ops datum 119 * @filp: the opened file 120 * @buffer: where to write the data for the user to read 121 * @count: the size of the user's buffer 122 * @ppos: file position offset 123 **/ 124 static ssize_t ixgbe_dbg_netdev_ops_read(struct file *filp, 125 char __user *buffer, 126 size_t count, loff_t *ppos) 127 { 128 struct ixgbe_adapter *adapter = filp->private_data; 129 char *buf; 130 int len; 131 132 /* don't allow partial reads */ 133 if (*ppos != 0) 134 return 0; 135 136 buf = kasprintf(GFP_KERNEL, "%s: %s\n", 137 adapter->netdev->name, 138 ixgbe_dbg_netdev_ops_buf); 139 if (!buf) 140 return -ENOMEM; 141 142 if (count < strlen(buf)) { 143 kfree(buf); 144 return -ENOSPC; 145 } 146 147 len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf)); 148 149 kfree(buf); 150 return len; 151 } 152 153 /** 154 * ixgbe_dbg_netdev_ops_write - write into netdev_ops datum 155 * @filp: the opened file 156 * @buffer: where to find the user's data 157 * @count: the length of the user's data 158 * @ppos: file position offset 159 **/ 160 static ssize_t ixgbe_dbg_netdev_ops_write(struct file *filp, 161 const char __user *buffer, 162 size_t count, loff_t *ppos) 163 { 164 struct ixgbe_adapter *adapter = filp->private_data; 165 int len; 166 167 /* don't allow partial writes */ 168 if (*ppos != 0) 169 return 0; 170 if (count >= sizeof(ixgbe_dbg_netdev_ops_buf)) 171 return -ENOSPC; 172 173 len = simple_write_to_buffer(ixgbe_dbg_netdev_ops_buf, 174 sizeof(ixgbe_dbg_netdev_ops_buf)-1, 175 ppos, 176 buffer, 177 count); 178 if (len < 0) 179 return len; 180 181 ixgbe_dbg_netdev_ops_buf[len] = '\0'; 182 183 if (strncmp(ixgbe_dbg_netdev_ops_buf, "tx_timeout", 10) == 0) { 184 adapter->netdev->netdev_ops->ndo_tx_timeout(adapter->netdev); 185 e_dev_info("tx_timeout called\n"); 186 } else { 187 e_dev_info("Unknown command: %s\n", ixgbe_dbg_netdev_ops_buf); 188 e_dev_info("Available commands:\n"); 189 e_dev_info(" tx_timeout\n"); 190 } 191 return count; 192 } 193 194 static const struct file_operations ixgbe_dbg_netdev_ops_fops = { 195 .owner = THIS_MODULE, 196 .open = simple_open, 197 .read = ixgbe_dbg_netdev_ops_read, 198 .write = ixgbe_dbg_netdev_ops_write, 199 }; 200 201 /** 202 * ixgbe_dbg_adapter_init - setup the debugfs directory for the adapter 203 * @adapter: the adapter that is starting up 204 **/ 205 void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter) 206 { 207 const char *name = pci_name(adapter->pdev); 208 struct dentry *pfile; 209 adapter->ixgbe_dbg_adapter = debugfs_create_dir(name, ixgbe_dbg_root); 210 if (adapter->ixgbe_dbg_adapter) { 211 pfile = debugfs_create_file("reg_ops", 0600, 212 adapter->ixgbe_dbg_adapter, adapter, 213 &ixgbe_dbg_reg_ops_fops); 214 if (!pfile) 215 e_dev_err("debugfs reg_ops for %s failed\n", name); 216 pfile = debugfs_create_file("netdev_ops", 0600, 217 adapter->ixgbe_dbg_adapter, adapter, 218 &ixgbe_dbg_netdev_ops_fops); 219 if (!pfile) 220 e_dev_err("debugfs netdev_ops for %s failed\n", name); 221 } else { 222 e_dev_err("debugfs entry for %s failed\n", name); 223 } 224 } 225 226 /** 227 * ixgbe_dbg_adapter_exit - clear out the adapter's debugfs entries 228 * @adapter: the adapter that is exiting 229 **/ 230 void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter) 231 { 232 debugfs_remove_recursive(adapter->ixgbe_dbg_adapter); 233 adapter->ixgbe_dbg_adapter = NULL; 234 } 235 236 /** 237 * ixgbe_dbg_init - start up debugfs for the driver 238 **/ 239 void ixgbe_dbg_init(void) 240 { 241 ixgbe_dbg_root = debugfs_create_dir(ixgbe_driver_name, NULL); 242 if (ixgbe_dbg_root == NULL) 243 pr_err("init of debugfs failed\n"); 244 } 245 246 /** 247 * ixgbe_dbg_exit - clean out the driver's debugfs entries 248 **/ 249 void ixgbe_dbg_exit(void) 250 { 251 debugfs_remove_recursive(ixgbe_dbg_root); 252 } 253