[deliverable/linux.git] / drivers / s390 / block / scm_drv.c

/*
 * Device driver for s390 storage class memory.
 *
 * Copyright IBM Corp. 2012
 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
 */

#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 scm_notify(struct scm_device *scmdev, enum scm_event event)
{
	struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);

	switch (event) {
	case SCM_CHANGE:
		pr_info("%lx: The capabilities of the SCM increment changed\n",
			(unsigned long) scmdev->address);
		SCM_LOG(2, "State changed");
		SCM_LOG_STATE(2, scmdev);
		break;
	case SCM_AVAIL:
		SCM_LOG(2, "Increment available");
		SCM_LOG_STATE(2, scmdev);
		scm_blk_set_available(bdev);
		break;
	}
}

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 = scm_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);
}
Commit	Line	Data
f30664e2 SO	1	/*
	2	* Device driver for s390 storage class memory.
	3	*
	4	* Copyright IBM Corp. 2012
	5	* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
	6	*/
	7
	8	#define KMSG_COMPONENT "scm_block"
	9	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	10
	11	#include <linux/module.h>
f30664e2 SO	12	#include <linux/slab.h>
	13	#include <asm/eadm.h>
	14	#include "scm_blk.h"
	15
93481c90	16	static void scm_notify(struct scm_device *scmdev, enum scm_event event)
f30664e2	17	{
aebfa669 SO	18	struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
aebfa669 SO	19
93481c90 SO	20	switch (event) {
93481c90 SO	21	case SCM_CHANGE:
3bff6038	22	pr_info("%lx: The capabilities of the SCM increment changed\n",
93481c90 SO	23	(unsigned long) scmdev->address);
	24	SCM_LOG(2, "State changed");
	25	SCM_LOG_STATE(2, scmdev);
	26	break;
aebfa669 SO	27	case SCM_AVAIL:
	28	SCM_LOG(2, "Increment available");
	29	SCM_LOG_STATE(2, scmdev);
	30	scm_blk_set_available(bdev);
	31	break;
93481c90	32	}
f30664e2 SO	33	}
	34
	35	static int scm_probe(struct scm_device *scmdev)
	36	{
	37	struct scm_blk_dev *bdev;
	38	int ret;
	39
	40	SCM_LOG(2, "probe");
	41	SCM_LOG_STATE(2, scmdev);
	42
	43	if (scmdev->attrs.oper_state != OP_STATE_GOOD)
	44	return -EINVAL;
	45
	46	bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
	47	if (!bdev)
	48	return -ENOMEM;
	49
f30664e2	50	dev_set_drvdata(&scmdev->dev, bdev);
f30664e2 SO	51	ret = scm_blk_dev_setup(bdev, scmdev);
f30664e2 SO	52	if (ret) {
f30664e2	53	dev_set_drvdata(&scmdev->dev, NULL);
f30664e2 SO	54	kfree(bdev);
	55	goto out;
	56	}
	57
	58	out:
	59	return ret;
	60	}
	61
	62	static int scm_remove(struct scm_device *scmdev)
	63	{
c3e6d407	64	struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
f30664e2	65
f30664e2	66	scm_blk_dev_cleanup(bdev);
24996edc	67	dev_set_drvdata(&scmdev->dev, NULL);
f30664e2 SO	68	kfree(bdev);
	69
	70	return 0;
	71	}
	72
	73	static struct scm_driver scm_drv = {
	74	.drv = {
	75	.name = "scm_block",
	76	.owner = THIS_MODULE,
	77	},
93481c90	78	.notify = scm_notify,
f30664e2 SO	79	.probe = scm_probe,
	80	.remove = scm_remove,
	81	.handler = scm_blk_irq,
	82	};
	83
	84	int __init scm_drv_init(void)
	85	{
	86	return scm_driver_register(&scm_drv);
	87	}
	88
	89	void scm_drv_cleanup(void)
	90	{
	91	scm_driver_unregister(&scm_drv);
	92	}