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", &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  **/
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