tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
9static struct dentry *ixgbe_dbg_root;
10
11static char ixgbe_dbg_reg_ops_buf[256] = "";
12
13static 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 **/
48static 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 **/
62static 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
115static 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
122static 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 **/
131static 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 **/
145static 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 adapter->netdev->netdev_ops->ndo_tx_timeout(adapter->netdev);
170 e_dev_info("tx_timeout called\n");
171 } else {
172 e_dev_info("Unknown command: %s\n", ixgbe_dbg_netdev_ops_buf);
173 e_dev_info("Available commands:\n");
174 e_dev_info(" tx_timeout\n");
175 }
176 return count;
177}
178
179static const struct file_operations ixgbe_dbg_netdev_ops_fops = {
180 .owner = THIS_MODULE,
181 .open = simple_open,
182 .read = ixgbe_dbg_netdev_ops_read,
183 .write = ixgbe_dbg_netdev_ops_write,
184};
185
186/**
187 * ixgbe_dbg_adapter_init - setup the debugfs directory for the adapter
188 * @adapter: the adapter that is starting up
189 **/
190void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter)
191{
192 const char *name = pci_name(adapter->pdev);
193 struct dentry *pfile;
194 adapter->ixgbe_dbg_adapter = debugfs_create_dir(name, ixgbe_dbg_root);
195 if (adapter->ixgbe_dbg_adapter) {
196 pfile = debugfs_create_file("reg_ops", 0600,
197 adapter->ixgbe_dbg_adapter, adapter,
198 &ixgbe_dbg_reg_ops_fops);
199 if (!pfile)
200 e_dev_err("debugfs reg_ops for %s failed\n", name);
201 pfile = debugfs_create_file("netdev_ops", 0600,
202 adapter->ixgbe_dbg_adapter, adapter,
203 &ixgbe_dbg_netdev_ops_fops);
204 if (!pfile)
205 e_dev_err("debugfs netdev_ops for %s failed\n", name);
206 } else {
207 e_dev_err("debugfs entry for %s failed\n", name);
208 }
209}
210
211/**
212 * ixgbe_dbg_adapter_exit - clear out the adapter's debugfs entries
213 * @adapter: the adapter that is exiting
214 **/
215void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter)
216{
217 debugfs_remove_recursive(adapter->ixgbe_dbg_adapter);
218 adapter->ixgbe_dbg_adapter = NULL;
219}
220
221/**
222 * ixgbe_dbg_init - start up debugfs for the driver
223 **/
224void ixgbe_dbg_init(void)
225{
226 ixgbe_dbg_root = debugfs_create_dir(ixgbe_driver_name, NULL);
227 if (ixgbe_dbg_root == NULL)
228 pr_err("init of debugfs failed\n");
229}
230
231/**
232 * ixgbe_dbg_exit - clean out the driver's debugfs entries
233 **/
234void ixgbe_dbg_exit(void)
235{
236 debugfs_remove_recursive(ixgbe_dbg_root);
237}