1/*
2 * QLogic Fibre Channel HBA Driver
3 * Copyright (c)  2003-2014 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
12static struct dentry *qla2x00_dfs_root;
13static atomic_t qla2x00_dfs_root_count;
14
15static int
16qla2x00_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
52static int
53qla2x00_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		ql_dbg(ql_dbg_user, vha, 0x705c,
68		    "DebugFS: Unable to disable FCE (%d).\n", rval);
69
70	ha->flags.fce_enabled = 0;
71
72	mutex_unlock(&ha->fce_mutex);
73out:
74	return single_open(file, qla2x00_dfs_fce_show, vha);
75}
76
77static int
78qla2x00_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		ql_dbg(ql_dbg_user, vha, 0x700d,
96		    "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
97		ha->flags.fce_enabled = 0;
98	}
99
100	mutex_unlock(&ha->fce_mutex);
101out:
102	return single_release(inode, file);
103}
104
105static 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
112int
113qla2x00_dfs_setup(scsi_qla_host_t *vha)
114{
115	struct qla_hw_data *ha = vha->hw;
116
117	if (!IS_QLA25XX(ha) && !IS_QLA81XX(ha) && !IS_QLA83XX(ha) &&
118	    !IS_QLA27XX(ha))
119		goto out;
120	if (!ha->fce)
121		goto out;
122
123	if (qla2x00_dfs_root)
124		goto create_dir;
125
126	atomic_set(&qla2x00_dfs_root_count, 0);
127	qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
128	if (!qla2x00_dfs_root) {
129		ql_log(ql_log_warn, vha, 0x00f7,
130		    "Unable to create debugfs root directory.\n");
131		goto out;
132	}
133
134create_dir:
135	if (ha->dfs_dir)
136		goto create_nodes;
137
138	mutex_init(&ha->fce_mutex);
139	ha->dfs_dir = debugfs_create_dir(vha->host_str, qla2x00_dfs_root);
140	if (!ha->dfs_dir) {
141		ql_log(ql_log_warn, vha, 0x00f8,
142		    "Unable to create debugfs ha directory.\n");
143		goto out;
144	}
145
146	atomic_inc(&qla2x00_dfs_root_count);
147
148create_nodes:
149	ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, vha,
150	    &dfs_fce_ops);
151	if (!ha->dfs_fce) {
152		ql_log(ql_log_warn, vha, 0x00f9,
153		    "Unable to create debugfs fce node.\n");
154		goto out;
155	}
156out:
157	return 0;
158}
159
160int
161qla2x00_dfs_remove(scsi_qla_host_t *vha)
162{
163	struct qla_hw_data *ha = vha->hw;
164	if (ha->dfs_fce) {
165		debugfs_remove(ha->dfs_fce);
166		ha->dfs_fce = NULL;
167	}
168
169	if (ha->dfs_dir) {
170		debugfs_remove(ha->dfs_dir);
171		ha->dfs_dir = NULL;
172		atomic_dec(&qla2x00_dfs_root_count);
173	}
174
175	if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
176	    qla2x00_dfs_root) {
177		debugfs_remove(qla2x00_dfs_root);
178		qla2x00_dfs_root = NULL;
179	}
180
181	return 0;
182}
183