Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6] / drivers / scsi / qla2xxx / qla_dfs.c
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 }