1 /*
2 * QLogic Fibre Channel HBA Driver
3 * Copyright (c) 2003-2005 QLogic Corporation
4 *
5 * See LICENSE.qla2xxx for copyright and licensing details.
6 */
7 #include "qla_def.h"
8
9 #include <linux/debugfs.h>
10 #include <linux/seq_file.h>
11
12 static struct dentry *qla2x00_dfs_root;
13 static atomic_t qla2x00_dfs_root_count;
14
15 static int
16 qla2x00_dfs_fce_show(struct seq_file *s, void *unused)
17 {
18 scsi_qla_host_t *ha = s->private;
19 uint32_t cnt;
20 uint32_t *fce;
21 uint64_t fce_start;
22
23 mutex_lock(&ha->fce_mutex);
24
25 seq_printf(s, "FCE Trace Buffer\n");
26 seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
27 seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
28 seq_printf(s, "FCE Enable Registers\n");
29 seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
30 ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
31 ha->fce_mb[5], ha->fce_mb[6]);
32
33 fce = (uint32_t *) ha->fce;
34 fce_start = (unsigned long long) ha->fce_dma;
35 for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
36 if (cnt % 8 == 0)
37 seq_printf(s, "\n%llx: ",
38 (unsigned long long)((cnt * 4) + fce_start));
39 else
40 seq_printf(s, " ");
41 seq_printf(s, "%08x", *fce++);
42 }
43
44 seq_printf(s, "\nEnd\n");
45
46 mutex_unlock(&ha->fce_mutex);
47
48 return 0;
49 }
50
51 static int
52 qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
53 {
54 scsi_qla_host_t *ha = inode->i_private;
55 int rval;
56
57 if (!ha->flags.fce_enabled)
58 goto out;
59
60 mutex_lock(&ha->fce_mutex);
61
62 /* Pause tracing to flush FCE buffers. */
63 rval = qla2x00_disable_fce_trace(ha, &ha->fce_wr, &ha->fce_rd);
64 if (rval)
65 qla_printk(KERN_WARNING, ha,
66 "DebugFS: Unable to disable FCE (%d).\n", rval);
67
68 ha->flags.fce_enabled = 0;
69
70 mutex_unlock(&ha->fce_mutex);
71 out:
72 return single_open(file, qla2x00_dfs_fce_show, ha);
73 }
74
75 static int
76 qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
77 {
78 scsi_qla_host_t *ha = inode->i_private;
79 int rval;
80
81 if (ha->flags.fce_enabled)
82 goto out;
83
84 mutex_lock(&ha->fce_mutex);
85
86 /* Re-enable FCE tracing. */
87 ha->flags.fce_enabled = 1;
88 memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
89 rval = qla2x00_enable_fce_trace(ha, ha->fce_dma, ha->fce_bufs,
90 ha->fce_mb, &ha->fce_bufs);
91 if (rval) {
92 qla_printk(KERN_WARNING, ha,
93 "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
94 ha->flags.fce_enabled = 0;
95 }
96
97 mutex_unlock(&ha->fce_mutex);
98 out:
99 return single_release(inode, file);
100 }
101
102 static const struct file_operations dfs_fce_ops = {
103 .open = qla2x00_dfs_fce_open,
104 .read = seq_read,
105 .llseek = seq_lseek,
106 .release = qla2x00_dfs_fce_release,
107 };
108
109 int
110 qla2x00_dfs_setup(scsi_qla_host_t *ha)
111 {
112 if (!IS_QLA25XX(ha))
113 goto out;
114 if (!ha->fce)
115 goto out;
116
117 if (qla2x00_dfs_root)
118 goto create_dir;
119
120 atomic_set(&qla2x00_dfs_root_count, 0);
121 qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
122 if (!qla2x00_dfs_root) {
123 qla_printk(KERN_NOTICE, ha,
124 "DebugFS: Unable to create root directory.\n");
125 goto out;
126 }
127
128 create_dir:
129 if (ha->dfs_dir)
130 goto create_nodes;
131
132 mutex_init(&ha->fce_mutex);
133 ha->dfs_dir = debugfs_create_dir(ha->host_str, qla2x00_dfs_root);
134 if (!ha->dfs_dir) {
135 qla_printk(KERN_NOTICE, ha,
136 "DebugFS: Unable to create ha directory.\n");
137 goto out;
138 }
139
140 atomic_inc(&qla2x00_dfs_root_count);
141
142 create_nodes:
143 ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, ha,
144 &dfs_fce_ops);
145 if (!ha->dfs_fce) {
146 qla_printk(KERN_NOTICE, ha,
147 "DebugFS: Unable to fce node.\n");
148 goto out;
149 }
150 out:
151 return 0;
152 }
153
154 int
155 qla2x00_dfs_remove(scsi_qla_host_t *ha)
156 {
157 if (ha->dfs_fce) {
158 debugfs_remove(ha->dfs_fce);
159 ha->dfs_fce = NULL;
160 }
161
162 if (ha->dfs_dir) {
163 debugfs_remove(ha->dfs_dir);
164 ha->dfs_dir = NULL;
165 atomic_dec(&qla2x00_dfs_root_count);
166 }
167
168 if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
169 qla2x00_dfs_root) {
170 debugfs_remove(qla2x00_dfs_root);
171 qla2x00_dfs_root = NULL;
172 }
173
174 return 0;
175 }
176
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