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", &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
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		/* 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
181static 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 **/
192void 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 **/
207void 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 **/
216void 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 **/
224void ixgbe_dbg_exit(void)
225{
226	debugfs_remove_recursive(ixgbe_dbg_root);
227}
228