io/fpc/fpc.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


#include <sys/types.h>
#include <sys/sunddi.h>
#include <sys/sunndi.h>
#include <sys/conf.h>
#include <sys/modctl.h>
#include <sys/stat.h>
#include <fpc.h>

static int fpc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int fpc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);

static struct dev_ops fpc_ops = {
    DEVO_REV,
    0,
    nulldev,
    nulldev,
    nulldev,
    fpc_attach,
    fpc_detach,
    nodev,
    NULL,
    NULL,
    nodev,
    ddi_quiesce_not_needed,     /* quiesce */
};

extern struct mod_ops mod_driverops;

static struct modldrv md = {
    &mod_driverops,
    "IO Chip Perf Counter",
    &fpc_ops,
};

static struct modlinkage ml = {
    MODREV_1,
    (void *)&md,
    NULL
};

int
_init(void)
{
    if (fpc_init_platform_check() != SUCCESS)
        return (ENODEV);
    return (mod_install(&ml));
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&ml, modinfop));
}

int
_fini(void)
{
    return (mod_remove(&ml));
}

static int
fpc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
    switch (cmd) {
    /*
     * Since the driver saves no state between calls, we can fully detach
     * on suspend and fully attach on resume.
     *
     * An RFE might be to save event register states for restore.
     * The result of not doing this is that the kstat reader (busstat)
     * may quit upon resume, seeing that the events have changed out from
     * underneath it (since the registers were powered off upon suspend).
     */
    case DDI_RESUME:
    case DDI_ATTACH:
        if (fpc_kstat_init(dip) != DDI_SUCCESS) {
            (void) fpc_detach(dip, DDI_DETACH);
            return (DDI_FAILURE);
        }
        return (DDI_SUCCESS);
    default:
        return (DDI_FAILURE);
    }
}

static int
fpc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_SUSPEND:
    case DDI_DETACH:
        fpc_kstat_fini(dip);
        return (DDI_SUCCESS);
    default:
        return (DDI_FAILURE);
    }
}