[deliverable/linux.git] / drivers / s390 / char / sclp_config.c

/*
 *  drivers/s390/char/sclp_config.c
 *
 *    Copyright IBM Corp. 2007
 *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/cpu.h>
#include <linux/sysdev.h>
#include <linux/workqueue.h>
#include <asm/smp.h>
#include "sclp.h"

#define TAG	"sclp_config: "

struct conf_mgm_data {
	u8 reserved;
	u8 ev_qualifier;
} __attribute__((packed));

#define EV_QUAL_CPU_CHANGE	1
#define EV_QUAL_CAP_CHANGE	3

static struct work_struct sclp_cpu_capability_work;
static struct work_struct sclp_cpu_change_work;

static void sclp_cpu_capability_notify(struct work_struct *work)
{
	int cpu;
	struct sys_device *sysdev;

	printk(KERN_WARNING TAG "cpu capability changed.\n");
	get_online_cpus();
	for_each_online_cpu(cpu) {
		sysdev = get_cpu_sysdev(cpu);
		kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
	}
	put_online_cpus();
}

static void __ref sclp_cpu_change_notify(struct work_struct *work)
{
	smp_rescan_cpus();
}

static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
{
	struct conf_mgm_data *cdata;

	cdata = (struct conf_mgm_data *)(evbuf + 1);
	switch (cdata->ev_qualifier) {
	case EV_QUAL_CPU_CHANGE:
		schedule_work(&sclp_cpu_change_work);
		break;
	case EV_QUAL_CAP_CHANGE:
		schedule_work(&sclp_cpu_capability_work);
		break;
	}
}

static struct sclp_register sclp_conf_register =
{
	.receive_mask = EVTYP_CONFMGMDATA_MASK,
	.receiver_fn  = sclp_conf_receiver_fn,
};

static int __init sclp_conf_init(void)
{
	int rc;

	INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
	INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);

	rc = sclp_register(&sclp_conf_register);
	if (rc) {
		printk(KERN_ERR TAG "failed to register (%d).\n", rc);
		return rc;
	}

	if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
		printk(KERN_WARNING TAG "no configuration management.\n");
		sclp_unregister(&sclp_conf_register);
		rc = -ENOSYS;
	}
	return rc;
}

__initcall(sclp_conf_init);
Commit	Line	Data
2fc2d1e9 HC	1	/*
	2	* drivers/s390/char/sclp_config.c
	3	*
	4	* Copyright IBM Corp. 2007
	5	* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
	6	*/
	7
	8	#include <linux/init.h>
	9	#include <linux/errno.h>
	10	#include <linux/cpu.h>
	11	#include <linux/sysdev.h>
	12	#include <linux/workqueue.h>
1e489518	13	#include <asm/smp.h>
2fc2d1e9 HC	14	#include "sclp.h"
	15
	16	#define TAG "sclp_config: "
	17
	18	struct conf_mgm_data {
	19	u8 reserved;
	20	u8 ev_qualifier;
	21	} __attribute__((packed));
	22
1e489518	23	#define EV_QUAL_CPU_CHANGE 1
2fc2d1e9 HC	24	#define EV_QUAL_CAP_CHANGE 3
	25
	26	static struct work_struct sclp_cpu_capability_work;
1e489518	27	static struct work_struct sclp_cpu_change_work;
2fc2d1e9 HC	28
	29	static void sclp_cpu_capability_notify(struct work_struct *work)
	30	{
	31	int cpu;
	32	struct sys_device *sysdev;
	33
	34	printk(KERN_WARNING TAG "cpu capability changed.\n");
86ef5c9a	35	get_online_cpus();
2fc2d1e9 HC	36	for_each_online_cpu(cpu) {
	37	sysdev = get_cpu_sysdev(cpu);
	38	kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
	39	}
86ef5c9a	40	put_online_cpus();
2fc2d1e9 HC	41	}
2fc2d1e9 HC	42
67060d9c	43	static void __ref sclp_cpu_change_notify(struct work_struct *work)
1e489518 HC	44	{
	45	smp_rescan_cpus();
	46	}
	47
2fc2d1e9 HC	48	static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
	49	{
	50	struct conf_mgm_data *cdata;
	51
	52	cdata = (struct conf_mgm_data *)(evbuf + 1);
1e489518 HC	53	switch (cdata->ev_qualifier) {
	54	case EV_QUAL_CPU_CHANGE:
	55	schedule_work(&sclp_cpu_change_work);
	56	break;
	57	case EV_QUAL_CAP_CHANGE:
2fc2d1e9	58	schedule_work(&sclp_cpu_capability_work);
1e489518 HC	59	break;
1e489518 HC	60	}
2fc2d1e9 HC	61	}
	62
	63	static struct sclp_register sclp_conf_register =
	64	{
	65	.receive_mask = EVTYP_CONFMGMDATA_MASK,
	66	.receiver_fn = sclp_conf_receiver_fn,
	67	};
	68
	69	static int __init sclp_conf_init(void)
	70	{
	71	int rc;
	72
	73	INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
1e489518	74	INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
2fc2d1e9 HC	75
	76	rc = sclp_register(&sclp_conf_register);
	77	if (rc) {
	78	printk(KERN_ERR TAG "failed to register (%d).\n", rc);
	79	return rc;
	80	}
	81
d082d3ce	82	if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
2fc2d1e9 HC	83	printk(KERN_WARNING TAG "no configuration management.\n");
	84	sclp_unregister(&sclp_conf_register);
	85	rc = -ENOSYS;
	86	}
	87	return rc;
	88	}
	89
	90	__initcall(sclp_conf_init);