qla_dfs.c

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/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2012 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_printf(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_printf(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_printf(s, " ");
        seq_printf(s, "%08x", *fce++);
    }

    seq_printf(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))
        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;
}