qla_dfs.c
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/*
* QLogic Fibre Channel HBA Driver
* Copyright (c) 2003-2014 QLogic Corporation
*
* See LICENSE.qla2xxx for copyright and licensing details.
*/
#include "qla_def.h"
#include <linux/debugfs.h>
#include <linux/seq_file.h>
static struct dentry *qla2x00_dfs_root;
static atomic_t qla2x00_dfs_root_count;
static int
qla2x00_dfs_fce_show(struct seq_file *s, void *unused)
{
scsi_qla_host_t *vha = s->private;
uint32_t cnt;
uint32_t *fce;
uint64_t fce_start;
struct qla_hw_data *ha = vha->hw;
mutex_lock(&ha->fce_mutex);
seq_puts(s, "FCE Trace Buffer\n");
seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
seq_puts(s, "FCE Enable Registers\n");
seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
ha->fce_mb[5], ha->fce_mb[6]);
fce = (uint32_t *) ha->fce;
fce_start = (unsigned long long) ha->fce_dma;
for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
if (cnt % 8 == 0)
seq_printf(s, "\n%llx: ",
(unsigned long long)((cnt * 4) + fce_start));
else
seq_putc(s, ' ');
seq_printf(s, "%08x", *fce++);
}
seq_puts(s, "\nEnd\n");
mutex_unlock(&ha->fce_mutex);
return 0;
}
static int
qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
{
scsi_qla_host_t *vha = inode->i_private;
struct qla_hw_data *ha = vha->hw;
int rval;
if (!ha->flags.fce_enabled)
goto out;
mutex_lock(&ha->fce_mutex);
/* Pause tracing to flush FCE buffers. */
rval = qla2x00_disable_fce_trace(vha, &ha->fce_wr, &ha->fce_rd);
if (rval)
ql_dbg(ql_dbg_user, vha, 0x705c,
"DebugFS: Unable to disable FCE (%d).\n", rval);
ha->flags.fce_enabled = 0;
mutex_unlock(&ha->fce_mutex);
out:
return single_open(file, qla2x00_dfs_fce_show, vha);
}
static int
qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
{
scsi_qla_host_t *vha = inode->i_private;
struct qla_hw_data *ha = vha->hw;
int rval;
if (ha->flags.fce_enabled)
goto out;
mutex_lock(&ha->fce_mutex);
/* Re-enable FCE tracing. */
ha->flags.fce_enabled = 1;
memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
rval = qla2x00_enable_fce_trace(vha, ha->fce_dma, ha->fce_bufs,
ha->fce_mb, &ha->fce_bufs);
if (rval) {
ql_dbg(ql_dbg_user, vha, 0x700d,
"DebugFS: Unable to reinitialize FCE (%d).\n", rval);
ha->flags.fce_enabled = 0;
}
mutex_unlock(&ha->fce_mutex);
out:
return single_release(inode, file);
}
static const struct file_operations dfs_fce_ops = {
.open = qla2x00_dfs_fce_open,
.read = seq_read,
.llseek = seq_lseek,
.release = qla2x00_dfs_fce_release,
};
int
qla2x00_dfs_setup(scsi_qla_host_t *vha)
{
struct qla_hw_data *ha = vha->hw;
if (!IS_QLA25XX(ha) && !IS_QLA81XX(ha) && !IS_QLA83XX(ha) &&
!IS_QLA27XX(ha))
goto out;
if (!ha->fce)
goto out;
if (qla2x00_dfs_root)
goto create_dir;
atomic_set(&qla2x00_dfs_root_count, 0);
qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
if (!qla2x00_dfs_root) {
ql_log(ql_log_warn, vha, 0x00f7,
"Unable to create debugfs root directory.\n");
goto out;
}
create_dir:
if (ha->dfs_dir)
goto create_nodes;
mutex_init(&ha->fce_mutex);
ha->dfs_dir = debugfs_create_dir(vha->host_str, qla2x00_dfs_root);
if (!ha->dfs_dir) {
ql_log(ql_log_warn, vha, 0x00f8,
"Unable to create debugfs ha directory.\n");
goto out;
}
atomic_inc(&qla2x00_dfs_root_count);
create_nodes:
ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, vha,
&dfs_fce_ops);
if (!ha->dfs_fce) {
ql_log(ql_log_warn, vha, 0x00f9,
"Unable to create debugfs fce node.\n");
goto out;
}
out:
return 0;
}
int
qla2x00_dfs_remove(scsi_qla_host_t *vha)
{
struct qla_hw_data *ha = vha->hw;
if (ha->dfs_fce) {
debugfs_remove(ha->dfs_fce);
ha->dfs_fce = NULL;
}
if (ha->dfs_dir) {
debugfs_remove(ha->dfs_dir);
ha->dfs_dir = NULL;
atomic_dec(&qla2x00_dfs_root_count);
}
if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
qla2x00_dfs_root) {
debugfs_remove(qla2x00_dfs_root);
qla2x00_dfs_root = NULL;
}
return 0;
}