Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / drivers / scsi / qla2xxx / qla_dfs.c
1 /*
2  * QLogic Fibre Channel HBA Driver
3  * Copyright (c)  2003-2008 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 *vha = s->private;
19         uint32_t cnt;
20         uint32_t *fce;
21         uint64_t fce_start;
22         struct qla_hw_data *ha = vha->hw;
23
24         mutex_lock(&ha->fce_mutex);
25
26         seq_printf(s, "FCE Trace Buffer\n");
27         seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
28         seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
29         seq_printf(s, "FCE Enable Registers\n");
30         seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
31             ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
32             ha->fce_mb[5], ha->fce_mb[6]);
33
34         fce = (uint32_t *) ha->fce;
35         fce_start = (unsigned long long) ha->fce_dma;
36         for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
37                 if (cnt % 8 == 0)
38                         seq_printf(s, "\n%llx: ",
39                             (unsigned long long)((cnt * 4) + fce_start));
40                 else
41                         seq_printf(s, " ");
42                 seq_printf(s, "%08x", *fce++);
43         }
44
45         seq_printf(s, "\nEnd\n");
46
47         mutex_unlock(&ha->fce_mutex);
48
49         return 0;
50 }
51
52 static int
53 qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
54 {
55         scsi_qla_host_t *vha = inode->i_private;
56         struct qla_hw_data *ha = vha->hw;
57         int rval;
58
59         if (!ha->flags.fce_enabled)
60                 goto out;
61
62         mutex_lock(&ha->fce_mutex);
63
64         /* Pause tracing to flush FCE buffers. */
65         rval = qla2x00_disable_fce_trace(vha, &ha->fce_wr, &ha->fce_rd);
66         if (rval)
67                 qla_printk(KERN_WARNING, ha,
68                     "DebugFS: Unable to disable FCE (%d).\n", rval);
69
70         ha->flags.fce_enabled = 0;
71
72         mutex_unlock(&ha->fce_mutex);
73 out:
74         return single_open(file, qla2x00_dfs_fce_show, ha);
75 }
76
77 static int
78 qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
79 {
80         scsi_qla_host_t *vha = inode->i_private;
81         struct qla_hw_data *ha = vha->hw;
82         int rval;
83
84         if (ha->flags.fce_enabled)
85                 goto out;
86
87         mutex_lock(&ha->fce_mutex);
88
89         /* Re-enable FCE tracing. */
90         ha->flags.fce_enabled = 1;
91         memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
92         rval = qla2x00_enable_fce_trace(vha, ha->fce_dma, ha->fce_bufs,
93             ha->fce_mb, &ha->fce_bufs);
94         if (rval) {
95                 qla_printk(KERN_WARNING, ha,
96                     "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
97                 ha->flags.fce_enabled = 0;
98         }
99
100         mutex_unlock(&ha->fce_mutex);
101 out:
102         return single_release(inode, file);
103 }
104
105 static const struct file_operations dfs_fce_ops = {
106         .open           = qla2x00_dfs_fce_open,
107         .read           = seq_read,
108         .llseek         = seq_lseek,
109         .release        = qla2x00_dfs_fce_release,
110 };
111
112 int
113 qla2x00_dfs_setup(scsi_qla_host_t *vha)
114 {
115         struct qla_hw_data *ha = vha->hw;
116         if (!IS_QLA25XX(ha))
117                 goto out;
118         if (!ha->fce)
119                 goto out;
120
121         if (qla2x00_dfs_root)
122                 goto create_dir;
123
124         atomic_set(&qla2x00_dfs_root_count, 0);
125         qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
126         if (!qla2x00_dfs_root) {
127                 qla_printk(KERN_NOTICE, ha,
128                     "DebugFS: Unable to create root directory.\n");
129                 goto out;
130         }
131
132 create_dir:
133         if (ha->dfs_dir)
134                 goto create_nodes;
135
136         mutex_init(&ha->fce_mutex);
137         ha->dfs_dir = debugfs_create_dir(vha->host_str, qla2x00_dfs_root);
138         if (!ha->dfs_dir) {
139                 qla_printk(KERN_NOTICE, ha,
140                     "DebugFS: Unable to create ha directory.\n");
141                 goto out;
142         }
143
144         atomic_inc(&qla2x00_dfs_root_count);
145
146 create_nodes:
147         ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, ha,
148             &dfs_fce_ops);
149         if (!ha->dfs_fce) {
150                 qla_printk(KERN_NOTICE, ha,
151                     "DebugFS: Unable to fce node.\n");
152                 goto out;
153         }
154 out:
155         return 0;
156 }
157
158 int
159 qla2x00_dfs_remove(scsi_qla_host_t *vha)
160 {
161         struct qla_hw_data *ha = vha->hw;
162         if (ha->dfs_fce) {
163                 debugfs_remove(ha->dfs_fce);
164                 ha->dfs_fce = NULL;
165         }
166
167         if (ha->dfs_dir) {
168                 debugfs_remove(ha->dfs_dir);
169                 ha->dfs_dir = NULL;
170                 atomic_dec(&qla2x00_dfs_root_count);
171         }
172
173         if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
174             qla2x00_dfs_root) {
175                 debugfs_remove(qla2x00_dfs_root);
176                 qla2x00_dfs_root = NULL;
177         }
178
179         return 0;
180 }