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
ixgbe_dbg_common_ops_read(struct file * filp,char __user * buffer,size_t count,loff_t * ppos,char * dbg_buf)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 **/
ixgbe_dbg_reg_ops_read(struct file * filp,char __user * buffer,size_t count,loff_t * ppos)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 **/
ixgbe_dbg_reg_ops_write(struct file * filp,const char __user * buffer,size_t count,loff_t * ppos)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 **/
ixgbe_dbg_netdev_ops_read(struct file * filp,char __user * buffer,size_t count,loff_t * ppos)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 **/
ixgbe_dbg_netdev_ops_write(struct file * filp,const char __user * buffer,size_t count,loff_t * ppos)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 **/
ixgbe_dbg_adapter_init(struct ixgbe_adapter * adapter)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 **/
ixgbe_dbg_adapter_exit(struct ixgbe_adapter * adapter)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 **/
ixgbe_dbg_init(void)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 **/
ixgbe_dbg_exit(void)224 void ixgbe_dbg_exit(void)
225 {
226 debugfs_remove_recursive(ixgbe_dbg_root);
227 }
228