scm_drv.c

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/*
 * Device driver for s390 storage class memory.
 *
 * Copyright IBM Corp. 2012
 * Author(s): Sebastian Ott <[email protected]>
 */

#define KMSG_COMPONENT "scm_block"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <asm/eadm.h>
#include "scm_blk.h"

static void notify(struct scm_device *scmdev)
{
    pr_info("%lu: The capabilities of the SCM increment changed\n",
        (unsigned long) scmdev->address);
    SCM_LOG(2, "State changed");
    SCM_LOG_STATE(2, scmdev);
}

static int scm_probe(struct scm_device *scmdev)
{
    struct scm_blk_dev *bdev;
    int ret;

    SCM_LOG(2, "probe");
    SCM_LOG_STATE(2, scmdev);

    if (scmdev->attrs.oper_state != OP_STATE_GOOD)
        return -EINVAL;

    bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
    if (!bdev)
        return -ENOMEM;

    dev_set_drvdata(&scmdev->dev, bdev);
    ret = scm_blk_dev_setup(bdev, scmdev);
    if (ret) {
        dev_set_drvdata(&scmdev->dev, NULL);
        kfree(bdev);
        goto out;
    }

out:
    return ret;
}

static int scm_remove(struct scm_device *scmdev)
{
    struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);

    scm_blk_dev_cleanup(bdev);
    dev_set_drvdata(&scmdev->dev, NULL);
    kfree(bdev);

    return 0;
}

static struct scm_driver scm_drv = {
    .drv = {
        .name = "scm_block",
        .owner = THIS_MODULE,
    },
    .notify = notify,
    .probe = scm_probe,
    .remove = scm_remove,
    .handler = scm_blk_irq,
};

int __init scm_drv_init(void)
{
    return scm_driver_register(&scm_drv);
}

void scm_drv_cleanup(void)
{
    scm_driver_unregister(&scm_drv);
}