linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  CCW device PGID and path verification I/O handling.

 *

 *    Copyright IBM Corp. 2002, 2009

 *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>

 *       Martin Schwidefsky <schwidefsky@de.ibm.com>

 *       Peter Oberparleiter <peter.oberparleiter@de.ibm.com>

 */

​

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/bitops.h>

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include <asm/ccwdev.h>

#include <asm/cio.h>

​

#include "cio.h"

#include "cio_debug.h"

#include "device.h"

#include "io_sch.h"

​

#define PGID_RETRIES    256

#define PGID_TIMEOUT    (10 * HZ)

​

static void verify_start(struct ccw_device *cdev);

​

/*

 * Process path verification data and report result.

 */

static void verify_done(struct ccw_device *cdev, int rc)

{

    struct subchannel *sch = to_subchannel(cdev->dev.parent);

    struct ccw_dev_id *id = &cdev->private->dev_id;

    int mpath = cdev->private->flags.mpath;

    int pgroup = cdev->private->flags.pgroup;

​

    if (rc)

        goto out;

    /* Ensure consistent multipathing state at device and channel. */

    if (sch->config.mp != mpath) {

        sch->config.mp = mpath;

        rc = cio_commit_config(sch);

    }

out:

    CIO_MSG_EVENT(2, "vrfy: device 0.%x.%04x: rc=%d pgroup=%d mpath=%d "

             "vpm=%02x\n", id->ssid, id->devno, rc, pgroup, mpath,

             sch->vpm);

    ccw_device_verify_done(cdev, rc);

}

​

/*

 * Create channel program to perform a NOOP.

 */

static void nop_build_cp(struct ccw_device *cdev)

{

    struct ccw_request *req = &cdev->private->req;

    struct ccw1 *cp = cdev->private->iccws;

​

    cp->cmd_code    = CCW_CMD_NOOP;

    cp->cda     = 0;