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

/*
 * Copyright IBM Corp. 2007, 2009
 *
 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
 *	      Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 */

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

#include <linux/completion.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/memory.h>
#include <linux/platform_device.h>
#include <asm/chpid.h>
#include <asm/sclp.h>
#include <asm/setup.h>

#include "sclp.h"

#define SCLP_CMDW_READ_SCP_INFO		0x00020001
#define SCLP_CMDW_READ_SCP_INFO_FORCED	0x00120001

struct read_info_sccb {
	struct	sccb_header header;	/* 0-7 */
	u16	rnmax;			/* 8-9 */
	u8	rnsize;			/* 10 */
	u8	_reserved0[24 - 11];	/* 11-15 */
	u8	loadparm[8];		/* 24-31 */
	u8	_reserved1[48 - 32];	/* 32-47 */
	u64	facilities;		/* 48-55 */
	u8	_reserved2[84 - 56];	/* 56-83 */
	u8	fac84;			/* 84 */
	u8	_reserved3[91 - 85];	/* 85-90 */
	u8	flags;			/* 91 */
	u8	_reserved4[100 - 92];	/* 92-99 */
	u32	rnsize2;		/* 100-103 */
	u64	rnmax2;			/* 104-111 */
	u8	_reserved5[4096 - 112];	/* 112-4095 */
} __attribute__((packed, aligned(PAGE_SIZE)));

static struct read_info_sccb __initdata early_read_info_sccb;
static int __initdata early_read_info_sccb_valid;

u64 sclp_facilities;
static u8 sclp_fac84;
static unsigned long long rzm;
static unsigned long long rnmax;

static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
{
	int rc;

	__ctl_set_bit(0, 9);
	rc = sclp_service_call(cmd, sccb);
	if (rc)
		goto out;
	__load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
			PSW_MASK_WAIT | PSW_DEFAULT_KEY);
	local_irq_disable();
out:
	/* Contents of the sccb might have changed. */
	barrier();
	__ctl_clear_bit(0, 9);
	return rc;
}

static void __init sclp_read_info_early(void)
{
	int rc;
	int i;
	struct read_info_sccb *sccb;
	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
				  SCLP_CMDW_READ_SCP_INFO};

	sccb = &early_read_info_sccb;
	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		do {
			memset(sccb, 0, sizeof(*sccb));
			sccb->header.length = sizeof(*sccb);
			sccb->header.control_mask[2] = 0x80;
			rc = sclp_cmd_sync_early(commands[i], sccb);
		} while (rc == -EBUSY);

		if (rc)
			break;
		if (sccb->header.response_code == 0x10) {
			early_read_info_sccb_valid = 1;
			break;
		}
		if (sccb->header.response_code != 0x1f0)
			break;
	}
}

void __init sclp_facilities_detect(void)
{
	struct read_info_sccb *sccb;

	sclp_read_info_early();
	if (!early_read_info_sccb_valid)
		return;

	sccb = &early_read_info_sccb;
	sclp_facilities = sccb->facilities;
	sclp_fac84 = sccb->fac84;
	rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	rzm <<= 20;
}

unsigned long long sclp_get_rnmax(void)
{
	return rnmax;
}

unsigned long long sclp_get_rzm(void)
{
	return rzm;
}

/*
 * This function will be called after sclp_facilities_detect(), which gets
 * called from early.c code. Therefore the sccb should have valid contents.
 */
void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
{
	struct read_info_sccb *sccb;

	if (!early_read_info_sccb_valid)
		return;
	sccb = &early_read_info_sccb;
	info->is_valid = 1;
	if (sccb->flags & 0x2)
		info->has_dump = 1;
	memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
}

static void sclp_sync_callback(struct sclp_req *req, void *data)
{
	struct completion *completion = data;

	complete(completion);
}

static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
{
	struct completion completion;
	struct sclp_req *request;
	int rc;

	request = kzalloc(sizeof(*request), GFP_KERNEL);
	if (!request)
		return -ENOMEM;
	request->command = cmd;
	request->sccb = sccb;
	request->status = SCLP_REQ_FILLED;
	request->callback = sclp_sync_callback;
	request->callback_data = &completion;
	init_completion(&completion);

	/* Perform sclp request. */
	rc = sclp_add_request(request);
	if (rc)
		goto out;
	wait_for_completion(&completion);

	/* Check response. */
	if (request->status != SCLP_REQ_DONE) {
		pr_warning("sync request failed (cmd=0x%08x, "
			   "status=0x%02x)\n", cmd, request->status);
		rc = -EIO;
	}
out:
	kfree(request);
	return rc;
}

/*
 * CPU configuration related functions.
 */

#define SCLP_CMDW_READ_CPU_INFO		0x00010001
#define SCLP_CMDW_CONFIGURE_CPU		0x00110001
#define SCLP_CMDW_DECONFIGURE_CPU	0x00100001

struct read_cpu_info_sccb {
	struct	sccb_header header;
	u16	nr_configured;
	u16	offset_configured;
	u16	nr_standby;
	u16	offset_standby;
	u8	reserved[4096 - 16];
} __attribute__((packed, aligned(PAGE_SIZE)));

static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
			       struct read_cpu_info_sccb *sccb)
{
	char *page = (char *) sccb;

	memset(info, 0, sizeof(*info));
	info->configured = sccb->nr_configured;
	info->standby = sccb->nr_standby;
	info->combined = sccb->nr_configured + sccb->nr_standby;
	info->has_cpu_type = sclp_fac84 & 0x1;
	memcpy(&info->cpu, page + sccb->offset_configured,
	       info->combined * sizeof(struct sclp_cpu_entry));
}

int sclp_get_cpu_info(struct sclp_cpu_info *info)
{
	int rc;
	struct read_cpu_info_sccb *sccb;

	if (!SCLP_HAS_CPU_INFO)
		return -EOPNOTSUPP;
	sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;
	sccb->header.length = sizeof(*sccb);
	rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
	if (rc)
		goto out;
	if (sccb->header.response_code != 0x0010) {
		pr_warning("readcpuinfo failed (response=0x%04x)\n",
			   sccb->header.response_code);
		rc = -EIO;
		goto out;
	}
	sclp_fill_cpu_info(info, sccb);
out:
	free_page((unsigned long) sccb);
	return rc;
}

struct cpu_configure_sccb {
	struct sccb_header header;
} __attribute__((packed, aligned(8)));

static int do_cpu_configure(sclp_cmdw_t cmd)
{
	struct cpu_configure_sccb *sccb;
	int rc;

	if (!SCLP_HAS_CPU_RECONFIG)
		return -EOPNOTSUPP;
	/*
	 * This is not going to cross a page boundary since we force
	 * kmalloc to have a minimum alignment of 8 bytes on s390.
	 */
	sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;
	sccb->header.length = sizeof(*sccb);
	rc = do_sync_request(cmd, sccb);
	if (rc)
		goto out;
	switch (sccb->header.response_code) {
	case 0x0020:
	case 0x0120:
		break;
	default:
		pr_warning("configure cpu failed (cmd=0x%08x, "
			   "response=0x%04x)\n", cmd,
			   sccb->header.response_code);
		rc = -EIO;
		break;
	}
out:
	kfree(sccb);
	return rc;
}

int sclp_cpu_configure(u8 cpu)
{
	return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
}

int sclp_cpu_deconfigure(u8 cpu)
{
	return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
}

#ifdef CONFIG_MEMORY_HOTPLUG

static DEFINE_MUTEX(sclp_mem_mutex);
static LIST_HEAD(sclp_mem_list);
static u8 sclp_max_storage_id;
static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
static int sclp_mem_state_changed;

struct memory_increment {
	struct list_head list;
	u16 rn;
	int standby;
	int usecount;
};

struct assign_storage_sccb {
	struct sccb_header header;
	u16 rn;
} __packed;

static unsigned long long rn2addr(u16 rn)
{
	return (unsigned long long) (rn - 1) * rzm;
}

static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
{
	struct assign_storage_sccb *sccb;
	int rc;

	sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;
	sccb->header.length = PAGE_SIZE;
	sccb->rn = rn;
	rc = do_sync_request(cmd, sccb);
	if (rc)
		goto out;
	switch (sccb->header.response_code) {
	case 0x0020:
	case 0x0120:
		break;
	default:
		pr_warning("assign storage failed (cmd=0x%08x, "
			   "response=0x%04x, rn=0x%04x)\n", cmd,
			   sccb->header.response_code, rn);
		rc = -EIO;
		break;
	}
out:
	free_page((unsigned long) sccb);
	return rc;
}

static int sclp_assign_storage(u16 rn)
{
	return do_assign_storage(0x000d0001, rn);
}

static int sclp_unassign_storage(u16 rn)
{
	return do_assign_storage(0x000c0001, rn);
}

struct attach_storage_sccb {
	struct sccb_header header;
	u16 :16;
	u16 assigned;
	u32 :32;
	u32 entries[0];
} __packed;

static int sclp_attach_storage(u8 id)
{
	struct attach_storage_sccb *sccb;
	int rc;
	int i;

	sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;
	sccb->header.length = PAGE_SIZE;
	rc = do_sync_request(0x00080001 | id << 8, sccb);
	if (rc)
		goto out;
	switch (sccb->header.response_code) {
	case 0x0020:
		set_bit(id, sclp_storage_ids);
		for (i = 0; i < sccb->assigned; i++)
			sclp_unassign_storage(sccb->entries[i] >> 16);
		break;
	default:
		rc = -EIO;
		break;
	}
out:
	free_page((unsigned long) sccb);
	return rc;
}

static int sclp_mem_change_state(unsigned long start, unsigned long size,
				 int online)
{
	struct memory_increment *incr;
	unsigned long long istart;
	int rc = 0;

	list_for_each_entry(incr, &sclp_mem_list, list) {
		istart = rn2addr(incr->rn);
		if (start + size - 1 < istart)
			break;
		if (start > istart + rzm - 1)
			continue;
		if (online) {
			if (incr->usecount++)
				continue;
			/*
			 * Don't break the loop if one assign fails. Loop may
			 * be walked again on CANCEL and we can't save
			 * information if state changed before or not.
			 * So continue and increase usecount for all increments.
			 */
			rc |= sclp_assign_storage(incr->rn);
		} else {
			if (--incr->usecount)
				continue;
			sclp_unassign_storage(incr->rn);
		}
	}
	return rc ? -EIO : 0;
}

static int sclp_mem_notifier(struct notifier_block *nb,
			     unsigned long action, void *data)
{
	unsigned long start, size;
	struct memory_notify *arg;
	unsigned char id;
	int rc = 0;

	arg = data;
	start = arg->start_pfn << PAGE_SHIFT;
	size = arg->nr_pages << PAGE_SHIFT;
	mutex_lock(&sclp_mem_mutex);
	for (id = 0; id <= sclp_max_storage_id; id++)
		if (!test_bit(id, sclp_storage_ids))
			sclp_attach_storage(id);
	switch (action) {
	case MEM_ONLINE:
	case MEM_GOING_OFFLINE:
	case MEM_CANCEL_OFFLINE:
		break;
	case MEM_GOING_ONLINE:
		rc = sclp_mem_change_state(start, size, 1);
		break;
	case MEM_CANCEL_ONLINE:
		sclp_mem_change_state(start, size, 0);
		break;
	case MEM_OFFLINE:
		sclp_mem_change_state(start, size, 0);
		break;
	default:
		rc = -EINVAL;
		break;
	}
	if (!rc)
		sclp_mem_state_changed = 1;
	mutex_unlock(&sclp_mem_mutex);
	return rc ? NOTIFY_BAD : NOTIFY_OK;
}

static struct notifier_block sclp_mem_nb = {
	.notifier_call = sclp_mem_notifier,
};

static void __init add_memory_merged(u16 rn)
{
	static u16 first_rn, num;
	unsigned long long start, size;

	if (rn && first_rn && (first_rn + num == rn)) {
		num++;
		return;
	}
	if (!first_rn)
		goto skip_add;
	start = rn2addr(first_rn);
	size = (unsigned long long ) num * rzm;
	if (start >= VMEM_MAX_PHYS)
		goto skip_add;
	if (start + size > VMEM_MAX_PHYS)
		size = VMEM_MAX_PHYS - start;
	if (memory_end_set && (start >= memory_end))
		goto skip_add;
	if (memory_end_set && (start + size > memory_end))
		size = memory_end - start;
	add_memory(0, start, size);
skip_add:
	first_rn = rn;
	num = 1;
}

static void __init sclp_add_standby_memory(void)
{
	struct memory_increment *incr;

	list_for_each_entry(incr, &sclp_mem_list, list)
		if (incr->standby)
			add_memory_merged(incr->rn);
	add_memory_merged(0);
}

static void __init insert_increment(u16 rn, int standby, int assigned)
{
	struct memory_increment *incr, *new_incr;
	struct list_head *prev;
	u16 last_rn;

	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	if (!new_incr)
		return;
	new_incr->rn = rn;
	new_incr->standby = standby;
	last_rn = 0;
	prev = &sclp_mem_list;
	list_for_each_entry(incr, &sclp_mem_list, list) {
		if (assigned && incr->rn > rn)
			break;
		if (!assigned && incr->rn - last_rn > 1)
			break;
		last_rn = incr->rn;
		prev = &incr->list;
	}
	if (!assigned)
		new_incr->rn = last_rn + 1;
	if (new_incr->rn > rnmax) {
		kfree(new_incr);
		return;
	}
	list_add(&new_incr->list, prev);
}

static int sclp_mem_freeze(struct device *dev)
{
	if (!sclp_mem_state_changed)
		return 0;
	pr_err("Memory hotplug state changed, suspend refused.\n");
	return -EPERM;
}

struct read_storage_sccb {
	struct sccb_header header;
	u16 max_id;
	u16 assigned;
	u16 standby;
	u16 :16;
	u32 entries[0];
} __packed;

static struct dev_pm_ops sclp_mem_pm_ops = {
	.freeze		= sclp_mem_freeze,
};

static struct platform_driver sclp_mem_pdrv = {
	.driver = {
		.name	= "sclp_mem",
		.pm	= &sclp_mem_pm_ops,
	},
};

static int __init sclp_detect_standby_memory(void)
{
	struct platform_device *sclp_pdev;
	struct read_storage_sccb *sccb;
	int i, id, assigned, rc;

	if (!early_read_info_sccb_valid)
		return 0;
	if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
		return 0;
	rc = -ENOMEM;
	sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		goto out;
	assigned = 0;
	for (id = 0; id <= sclp_max_storage_id; id++) {
		memset(sccb, 0, PAGE_SIZE);
		sccb->header.length = PAGE_SIZE;
		rc = do_sync_request(0x00040001 | id << 8, sccb);
		if (rc)
			goto out;
		switch (sccb->header.response_code) {
		case 0x0010:
			set_bit(id, sclp_storage_ids);
			for (i = 0; i < sccb->assigned; i++) {
				if (!sccb->entries[i])
					continue;
				assigned++;
				insert_increment(sccb->entries[i] >> 16, 0, 1);
			}
			break;
		case 0x0310:
			break;
		case 0x0410:
			for (i = 0; i < sccb->assigned; i++) {
				if (!sccb->entries[i])
					continue;
				assigned++;
				insert_increment(sccb->entries[i] >> 16, 1, 1);
			}
			break;
		default:
			rc = -EIO;
			break;
		}
		if (!rc)
			sclp_max_storage_id = sccb->max_id;
	}
	if (rc || list_empty(&sclp_mem_list))
		goto out;
	for (i = 1; i <= rnmax - assigned; i++)
		insert_increment(0, 1, 0);
	rc = register_memory_notifier(&sclp_mem_nb);
	if (rc)
		goto out;
	rc = platform_driver_register(&sclp_mem_pdrv);
	if (rc)
		goto out;
	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
	rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
	if (rc)
		goto out_driver;
	sclp_add_standby_memory();
	goto out;
out_driver:
	platform_driver_unregister(&sclp_mem_pdrv);
out:
	free_page((unsigned long) sccb);
	return rc;
}
__initcall(sclp_detect_standby_memory);

#endif /* CONFIG_MEMORY_HOTPLUG */

/*
 * Channel path configuration related functions.
 */

#define SCLP_CMDW_CONFIGURE_CHPATH		0x000f0001
#define SCLP_CMDW_DECONFIGURE_CHPATH		0x000e0001
#define SCLP_CMDW_READ_CHPATH_INFORMATION	0x00030001

struct chp_cfg_sccb {
	struct sccb_header header;
	u8 ccm;
	u8 reserved[6];
	u8 cssid;
} __attribute__((packed));

static int do_chp_configure(sclp_cmdw_t cmd)
{
	struct chp_cfg_sccb *sccb;
	int rc;

	if (!SCLP_HAS_CHP_RECONFIG)
		return -EOPNOTSUPP;
	/* Prepare sccb. */
	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;
	sccb->header.length = sizeof(*sccb);
	rc = do_sync_request(cmd, sccb);
	if (rc)
		goto out;
	switch (sccb->header.response_code) {
	case 0x0020:
	case 0x0120:
	case 0x0440:
	case 0x0450:
		break;
	default:
		pr_warning("configure channel-path failed "
			   "(cmd=0x%08x, response=0x%04x)\n", cmd,
			   sccb->header.response_code);
		rc = -EIO;
		break;
	}
out:
	free_page((unsigned long) sccb);
	return rc;
}

/**
 * sclp_chp_configure - perform configure channel-path sclp command
 * @chpid: channel-path ID
 *
 * Perform configure channel-path command sclp command for specified chpid.
 * Return 0 after command successfully finished, non-zero otherwise.
 */
int sclp_chp_configure(struct chp_id chpid)
{
	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
}

/**
 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
 * @chpid: channel-path ID
 *
 * Perform deconfigure channel-path command sclp command for specified chpid
 * and wait for completion. On success return 0. Return non-zero otherwise.
 */
int sclp_chp_deconfigure(struct chp_id chpid)
{
	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
}

struct chp_info_sccb {
	struct sccb_header header;
	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
	u8 ccm;
	u8 reserved[6];
	u8 cssid;
} __attribute__((packed));

/**
 * sclp_chp_read_info - perform read channel-path information sclp command
 * @info: resulting channel-path information data
 *
 * Perform read channel-path information sclp command and wait for completion.
 * On success, store channel-path information in @info and return 0. Return
 * non-zero otherwise.
 */
int sclp_chp_read_info(struct sclp_chp_info *info)
{
	struct chp_info_sccb *sccb;
	int rc;

	if (!SCLP_HAS_CHP_INFO)
		return -EOPNOTSUPP;
	/* Prepare sccb. */
	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;
	sccb->header.length = sizeof(*sccb);
	rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
	if (rc)
		goto out;
	if (sccb->header.response_code != 0x0010) {
		pr_warning("read channel-path info failed "
			   "(response=0x%04x)\n", sccb->header.response_code);
		rc = -EIO;
		goto out;
	}
	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
out:
	free_page((unsigned long) sccb);
	return rc;
}
Commit	Line	Data
08d07968	1	/*
03997904	2	* Copyright IBM Corp. 2007, 2009
08d07968	3	*
03997904 GS	4	* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
03997904 GS	5	* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
08d07968 HC	6	*/
08d07968 HC	7
b3ff088b MS	8	#define KMSG_COMPONENT "sclp_cmd"
	9	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	10
08d07968 HC	11	#include <linux/completion.h>
	12	#include <linux/init.h>
	13	#include <linux/errno.h>
03997904	14	#include <linux/err.h>
08d07968 HC	15	#include <linux/slab.h>
08d07968 HC	16	#include <linux/string.h>
e0bc2495 HC	17	#include <linux/mm.h>
	18	#include <linux/mmzone.h>
	19	#include <linux/memory.h>
03997904	20	#include <linux/platform_device.h>
4b28a8fe	21	#include <asm/chpid.h>
08d07968	22	#include <asm/sclp.h>
23d75d9c	23	#include <asm/setup.h>
08d07968	24
b3ff088b	25	#include "sclp.h"
08d07968 HC	26
	27	#define SCLP_CMDW_READ_SCP_INFO 0x00020001
	28	#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
	29
	30	struct read_info_sccb {
	31	struct sccb_header header; /* 0-7 */
	32	u16 rnmax; /* 8-9 */
	33	u8 rnsize; /* 10 */
	34	u8 _reserved0[24 - 11]; /* 11-15 */
	35	u8 loadparm[8]; /* 24-31 */
	36	u8 _reserved1[48 - 32]; /* 32-47 */
	37	u64 facilities; /* 48-55 */
	38	u8 _reserved2[84 - 56]; /* 56-83 */
	39	u8 fac84; /* 84 */
	40	u8 _reserved3[91 - 85]; /* 85-90 */
	41	u8 flags; /* 91 */
	42	u8 _reserved4[100 - 92]; /* 92-99 */
	43	u32 rnsize2; /* 100-103 */
	44	u64 rnmax2; /* 104-111 */
	45	u8 _reserved5[4096 - 112]; /* 112-4095 */
	46	} __attribute__((packed, aligned(PAGE_SIZE)));
	47
	48	static struct read_info_sccb __initdata early_read_info_sccb;
	49	static int __initdata early_read_info_sccb_valid;
	50
	51	u64 sclp_facilities;
	52	static u8 sclp_fac84;
e0bc2495 HC	53	static unsigned long long rzm;
e0bc2495 HC	54	static unsigned long long rnmax;
08d07968 HC	55
	56	static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
	57	{
	58	int rc;
	59
	60	__ctl_set_bit(0, 9);
	61	rc = sclp_service_call(cmd, sccb);
	62	if (rc)
	63	goto out;
	64	__load_psw_mask(PSW_BASE_BITS \| PSW_MASK_EXT \|
	65	PSW_MASK_WAIT \| PSW_DEFAULT_KEY);
	66	local_irq_disable();
	67	out:
	68	/* Contents of the sccb might have changed. */
	69	barrier();
	70	__ctl_clear_bit(0, 9);
	71	return rc;
	72	}
	73
23d17421	74	static void __init sclp_read_info_early(void)
08d07968 HC	75	{
	76	int rc;
	77	int i;
	78	struct read_info_sccb *sccb;
	79	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
	80	SCLP_CMDW_READ_SCP_INFO};
	81
	82	sccb = &early_read_info_sccb;
	83	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	84	do {
	85	memset(sccb, 0, sizeof(*sccb));
	86	sccb->header.length = sizeof(*sccb);
	87	sccb->header.control_mask[2] = 0x80;
	88	rc = sclp_cmd_sync_early(commands[i], sccb);
	89	} while (rc == -EBUSY);
	90
	91	if (rc)
	92	break;
	93	if (sccb->header.response_code == 0x10) {
	94	early_read_info_sccb_valid = 1;
	95	break;
	96	}
	97	if (sccb->header.response_code != 0x1f0)
	98	break;
	99	}
	100	}
	101
	102	void __init sclp_facilities_detect(void)
	103	{
08d07968 HC	104	struct read_info_sccb *sccb;
08d07968 HC	105
23d17421	106	sclp_read_info_early();
08d07968	107	if (!early_read_info_sccb_valid)
23d17421 HC	108	return;
23d17421 HC	109
08d07968	110	sccb = &early_read_info_sccb;
23d17421 HC	111	sclp_facilities = sccb->facilities;
23d17421 HC	112	sclp_fac84 = sccb->fac84;
e0bc2495 HC	113	rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	114	rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	115	rzm <<= 20;
23d17421 HC	116	}
	117
	118	unsigned long long sclp_get_rnmax(void)
	119	{
	120	return rnmax;
	121	}
	122
	123	unsigned long long sclp_get_rzm(void)
	124	{
	125	return rzm;
08d07968 HC	126	}
	127
	128	/*
23d17421 HC	129	* This function will be called after sclp_facilities_detect(), which gets
23d17421 HC	130	* called from early.c code. Therefore the sccb should have valid contents.
08d07968 HC	131	*/
	132	void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
	133	{
	134	struct read_info_sccb *sccb;
	135
	136	if (!early_read_info_sccb_valid)
	137	return;
	138	sccb = &early_read_info_sccb;
	139	info->is_valid = 1;
	140	if (sccb->flags & 0x2)
	141	info->has_dump = 1;
	142	memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
	143	}
	144
	145	static void sclp_sync_callback(struct sclp_req req, void data)
	146	{
	147	struct completion *completion = data;
	148
	149	complete(completion);
	150	}
	151
	152	static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
	153	{
	154	struct completion completion;
	155	struct sclp_req *request;
	156	int rc;
	157
	158	request = kzalloc(sizeof(*request), GFP_KERNEL);
	159	if (!request)
	160	return -ENOMEM;
	161	request->command = cmd;
	162	request->sccb = sccb;
	163	request->status = SCLP_REQ_FILLED;
	164	request->callback = sclp_sync_callback;
	165	request->callback_data = &completion;
	166	init_completion(&completion);
	167
	168	/* Perform sclp request. */
	169	rc = sclp_add_request(request);
	170	if (rc)
	171	goto out;
	172	wait_for_completion(&completion);
	173
	174	/* Check response. */
	175	if (request->status != SCLP_REQ_DONE) {
b3ff088b MS	176	pr_warning("sync request failed (cmd=0x%08x, "
b3ff088b MS	177	"status=0x%02x)\n", cmd, request->status);
08d07968 HC	178	rc = -EIO;
	179	}
	180	out:
	181	kfree(request);
	182	return rc;
	183	}
	184
	185	/*
	186	* CPU configuration related functions.
	187	*/
	188
	189	#define SCLP_CMDW_READ_CPU_INFO 0x00010001
	190	#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
	191	#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
	192
	193	struct read_cpu_info_sccb {
	194	struct sccb_header header;
	195	u16 nr_configured;
	196	u16 offset_configured;
	197	u16 nr_standby;
	198	u16 offset_standby;
	199	u8 reserved[4096 - 16];
	200	} __attribute__((packed, aligned(PAGE_SIZE)));
	201
08d07968 HC	202	static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
	203	struct read_cpu_info_sccb *sccb)
	204	{
	205	char page = (char ) sccb;
	206
	207	memset(info, 0, sizeof(*info));
	208	info->configured = sccb->nr_configured;
	209	info->standby = sccb->nr_standby;
	210	info->combined = sccb->nr_configured + sccb->nr_standby;
	211	info->has_cpu_type = sclp_fac84 & 0x1;
	212	memcpy(&info->cpu, page + sccb->offset_configured,
	213	info->combined * sizeof(struct sclp_cpu_entry));
	214	}
	215
48483b32	216	int sclp_get_cpu_info(struct sclp_cpu_info *info)
08d07968 HC	217	{
	218	int rc;
	219	struct read_cpu_info_sccb *sccb;
	220
	221	if (!SCLP_HAS_CPU_INFO)
	222	return -EOPNOTSUPP;
48483b32	223	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
08d07968 HC	224	if (!sccb)
08d07968 HC	225	return -ENOMEM;
08d07968 HC	226	sccb->header.length = sizeof(*sccb);
	227	rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
	228	if (rc)
	229	goto out;
	230	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	231	pr_warning("readcpuinfo failed (response=0x%04x)\n",
b3ff088b MS	232	sccb->header.response_code);
08d07968 HC	233	rc = -EIO;
	234	goto out;
	235	}
	236	sclp_fill_cpu_info(info, sccb);
	237	out:
	238	free_page((unsigned long) sccb);
	239	return rc;
	240	}
	241
08d07968 HC	242	struct cpu_configure_sccb {
	243	struct sccb_header header;
	244	} __attribute__((packed, aligned(8)));
	245
	246	static int do_cpu_configure(sclp_cmdw_t cmd)
	247	{
	248	struct cpu_configure_sccb *sccb;
	249	int rc;
	250
	251	if (!SCLP_HAS_CPU_RECONFIG)
	252	return -EOPNOTSUPP;
	253	/*
	254	* This is not going to cross a page boundary since we force
	255	* kmalloc to have a minimum alignment of 8 bytes on s390.
	256	*/
	257	sccb = kzalloc(sizeof(*sccb), GFP_KERNEL \| GFP_DMA);
	258	if (!sccb)
	259	return -ENOMEM;
	260	sccb->header.length = sizeof(*sccb);
	261	rc = do_sync_request(cmd, sccb);
	262	if (rc)
	263	goto out;
	264	switch (sccb->header.response_code) {
	265	case 0x0020:
	266	case 0x0120:
	267	break;
	268	default:
b3ff088b MS	269	pr_warning("configure cpu failed (cmd=0x%08x, "
	270	"response=0x%04x)\n", cmd,
	271	sccb->header.response_code);
08d07968 HC	272	rc = -EIO;
	273	break;
	274	}
	275	out:
	276	kfree(sccb);
	277	return rc;
	278	}
	279
	280	int sclp_cpu_configure(u8 cpu)
	281	{
	282	return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU \| cpu << 8);
	283	}
	284
	285	int sclp_cpu_deconfigure(u8 cpu)
	286	{
	287	return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU \| cpu << 8);
	288	}
4b28a8fe	289
e0bc2495 HC	290	#ifdef CONFIG_MEMORY_HOTPLUG
	291
	292	static DEFINE_MUTEX(sclp_mem_mutex);
	293	static LIST_HEAD(sclp_mem_list);
	294	static u8 sclp_max_storage_id;
	295	static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
03997904	296	static int sclp_mem_state_changed;
e0bc2495 HC	297
	298	struct memory_increment {
	299	struct list_head list;
	300	u16 rn;
	301	int standby;
	302	int usecount;
	303	};
	304
	305	struct assign_storage_sccb {
	306	struct sccb_header header;
	307	u16 rn;
	308	} __packed;
	309
	310	static unsigned long long rn2addr(u16 rn)
	311	{
	312	return (unsigned long long) (rn - 1) * rzm;
	313	}
	314
	315	static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
	316	{
	317	struct assign_storage_sccb *sccb;
	318	int rc;
	319
	320	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	321	if (!sccb)
	322	return -ENOMEM;
	323	sccb->header.length = PAGE_SIZE;
	324	sccb->rn = rn;
	325	rc = do_sync_request(cmd, sccb);
	326	if (rc)
	327	goto out;
	328	switch (sccb->header.response_code) {
	329	case 0x0020:
	330	case 0x0120:
	331	break;
	332	default:
675be97a HC	333	pr_warning("assign storage failed (cmd=0x%08x, "
	334	"response=0x%04x, rn=0x%04x)\n", cmd,
	335	sccb->header.response_code, rn);
e0bc2495 HC	336	rc = -EIO;
	337	break;
	338	}
	339	out:
	340	free_page((unsigned long) sccb);
	341	return rc;
	342	}
	343
	344	static int sclp_assign_storage(u16 rn)
	345	{
	346	return do_assign_storage(0x000d0001, rn);
	347	}
	348
	349	static int sclp_unassign_storage(u16 rn)
	350	{
	351	return do_assign_storage(0x000c0001, rn);
	352	}
	353
	354	struct attach_storage_sccb {
	355	struct sccb_header header;
	356	u16 :16;
	357	u16 assigned;
	358	u32 :32;
	359	u32 entries[0];
	360	} __packed;
	361
	362	static int sclp_attach_storage(u8 id)
	363	{
	364	struct attach_storage_sccb *sccb;
	365	int rc;
	366	int i;
	367
	368	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	369	if (!sccb)
	370	return -ENOMEM;
	371	sccb->header.length = PAGE_SIZE;
	372	rc = do_sync_request(0x00080001 \| id << 8, sccb);
	373	if (rc)
	374	goto out;
	375	switch (sccb->header.response_code) {
	376	case 0x0020:
	377	set_bit(id, sclp_storage_ids);
	378	for (i = 0; i < sccb->assigned; i++)
	379	sclp_unassign_storage(sccb->entries[i] >> 16);
	380	break;
	381	default:
	382	rc = -EIO;
	383	break;
	384	}
	385	out:
	386	free_page((unsigned long) sccb);
	387	return rc;
	388	}
	389
	390	static int sclp_mem_change_state(unsigned long start, unsigned long size,
	391	int online)
	392	{
	393	struct memory_increment *incr;
	394	unsigned long long istart;
	395	int rc = 0;
	396
	397	list_for_each_entry(incr, &sclp_mem_list, list) {
	398	istart = rn2addr(incr->rn);
	399	if (start + size - 1 < istart)
400	break;
401	if (start > istart + rzm - 1)
402	continue;
403	if (online) {
404	if (incr->usecount++)
405	continue;
406	/*
407	* Don't break the loop if one assign fails. Loop may
408	* be walked again on CANCEL and we can't save
409	* information if state changed before or not.
410	* So continue and increase usecount for all increments.
411	*/
412	rc \|= sclp_assign_storage(incr->rn);
413	} else {
414	if (--incr->usecount)
415	continue;
416	sclp_unassign_storage(incr->rn);
417	}
418	}
419	return rc ? -EIO : 0;
420	}
421
422	static int sclp_mem_notifier(struct notifier_block *nb,
423	unsigned long action, void *data)
424	{
425	unsigned long start, size;
426	struct memory_notify *arg;
427	unsigned char id;
428	int rc = 0;
429
430	arg = data;
431	start = arg->start_pfn << PAGE_SHIFT;
432	size = arg->nr_pages << PAGE_SHIFT;
433	mutex_lock(&sclp_mem_mutex);
434	for (id = 0; id <= sclp_max_storage_id; id++)
435	if (!test_bit(id, sclp_storage_ids))
436	sclp_attach_storage(id);
437	switch (action) {
438	case MEM_ONLINE:
7e9238fb GS	439	case MEM_GOING_OFFLINE:
7e9238fb GS	440	case MEM_CANCEL_OFFLINE:
e0bc2495 HC	441	break;
	442	case MEM_GOING_ONLINE:
	443	rc = sclp_mem_change_state(start, size, 1);
	444	break;
	445	case MEM_CANCEL_ONLINE:
	446	sclp_mem_change_state(start, size, 0);
	447	break;
7e9238fb GS	448	case MEM_OFFLINE:
	449	sclp_mem_change_state(start, size, 0);
	450	break;
e0bc2495 HC	451	default:
	452	rc = -EINVAL;
	453	break;
	454	}
03997904 GS	455	if (!rc)
03997904 GS	456	sclp_mem_state_changed = 1;
e0bc2495 HC	457	mutex_unlock(&sclp_mem_mutex);
	458	return rc ? NOTIFY_BAD : NOTIFY_OK;
	459	}
	460
	461	static struct notifier_block sclp_mem_nb = {
	462	.notifier_call = sclp_mem_notifier,
	463	};
	464
	465	static void __init add_memory_merged(u16 rn)
	466	{
	467	static u16 first_rn, num;
	468	unsigned long long start, size;
	469
	470	if (rn && first_rn && (first_rn + num == rn)) {
	471	num++;
	472	return;
	473	}
	474	if (!first_rn)
	475	goto skip_add;
	476	start = rn2addr(first_rn);
	477	size = (unsigned long long ) num * rzm;
	478	if (start >= VMEM_MAX_PHYS)
	479	goto skip_add;
	480	if (start + size > VMEM_MAX_PHYS)
	481	size = VMEM_MAX_PHYS - start;
23d75d9c HC	482	if (memory_end_set && (start >= memory_end))
	483	goto skip_add;
	484	if (memory_end_set && (start + size > memory_end))
	485	size = memory_end - start;
e0bc2495 HC	486	add_memory(0, start, size);
	487	skip_add:
	488	first_rn = rn;
	489	num = 1;
	490	}
	491
	492	static void __init sclp_add_standby_memory(void)
	493	{
	494	struct memory_increment *incr;
	495
	496	list_for_each_entry(incr, &sclp_mem_list, list)
	497	if (incr->standby)
	498	add_memory_merged(incr->rn);
	499	add_memory_merged(0);
	500	}
	501
	502	static void __init insert_increment(u16 rn, int standby, int assigned)
	503	{
	504	struct memory_increment incr, new_incr;
	505	struct list_head *prev;
	506	u16 last_rn;
	507
	508	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	509	if (!new_incr)
	510	return;
	511	new_incr->rn = rn;
	512	new_incr->standby = standby;
	513	last_rn = 0;
	514	prev = &sclp_mem_list;
	515	list_for_each_entry(incr, &sclp_mem_list, list) {
	516	if (assigned && incr->rn > rn)
	517	break;
	518	if (!assigned && incr->rn - last_rn > 1)
	519	break;
	520	last_rn = incr->rn;
	521	prev = &incr->list;
	522	}
	523	if (!assigned)
	524	new_incr->rn = last_rn + 1;
	525	if (new_incr->rn > rnmax) {
	526	kfree(new_incr);
	527	return;
	528	}
	529	list_add(&new_incr->list, prev);
	530	}
	531
03997904 GS	532	static int sclp_mem_freeze(struct device *dev)
	533	{
	534	if (!sclp_mem_state_changed)
	535	return 0;
	536	pr_err("Memory hotplug state changed, suspend refused.\n");
	537	return -EPERM;
	538	}
	539
e0bc2495 HC	540	struct read_storage_sccb {
	541	struct sccb_header header;
	542	u16 max_id;
	543	u16 assigned;
	544	u16 standby;
	545	u16 :16;
	546	u32 entries[0];
	547	} __packed;
	548
03997904 GS	549	static struct dev_pm_ops sclp_mem_pm_ops = {
	550	.freeze = sclp_mem_freeze,
	551	};
	552
	553	static struct platform_driver sclp_mem_pdrv = {
	554	.driver = {
	555	.name = "sclp_mem",
	556	.pm = &sclp_mem_pm_ops,
	557	},
	558	};
	559
e0bc2495 HC	560	static int __init sclp_detect_standby_memory(void)
e0bc2495 HC	561	{
03997904	562	struct platform_device *sclp_pdev;
e0bc2495 HC	563	struct read_storage_sccb *sccb;
	564	int i, id, assigned, rc;
	565
	566	if (!early_read_info_sccb_valid)
	567	return 0;
	568	if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
	569	return 0;
	570	rc = -ENOMEM;
	571	sccb = (void *) __get_free_page(GFP_KERNEL \| GFP_DMA);
	572	if (!sccb)
	573	goto out;
	574	assigned = 0;
	575	for (id = 0; id <= sclp_max_storage_id; id++) {
	576	memset(sccb, 0, PAGE_SIZE);
	577	sccb->header.length = PAGE_SIZE;
	578	rc = do_sync_request(0x00040001 \| id << 8, sccb);
	579	if (rc)
	580	goto out;
	581	switch (sccb->header.response_code) {
	582	case 0x0010:
	583	set_bit(id, sclp_storage_ids);
	584	for (i = 0; i < sccb->assigned; i++) {
	585	if (!sccb->entries[i])
	586	continue;
	587	assigned++;
	588	insert_increment(sccb->entries[i] >> 16, 0, 1);
	589	}
	590	break;
	591	case 0x0310:
	592	break;
	593	case 0x0410:
	594	for (i = 0; i < sccb->assigned; i++) {
	595	if (!sccb->entries[i])
	596	continue;
	597	assigned++;
	598	insert_increment(sccb->entries[i] >> 16, 1, 1);
	599	}
	600	break;
	601	default:
	602	rc = -EIO;
	603	break;
	604	}
	605	if (!rc)
	606	sclp_max_storage_id = sccb->max_id;
	607	}
	608	if (rc \|\| list_empty(&sclp_mem_list))
	609	goto out;
	610	for (i = 1; i <= rnmax - assigned; i++)
	611	insert_increment(0, 1, 0);
	612	rc = register_memory_notifier(&sclp_mem_nb);
	613	if (rc)
	614	goto out;
03997904 GS	615	rc = platform_driver_register(&sclp_mem_pdrv);
	616	if (rc)
	617	goto out;
	618	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
	619	rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
	620	if (rc)
	621	goto out_driver;
e0bc2495	622	sclp_add_standby_memory();
03997904 GS	623	goto out;
	624	out_driver:
	625	platform_driver_unregister(&sclp_mem_pdrv);
e0bc2495 HC	626	out:
	627	free_page((unsigned long) sccb);
	628	return rc;
	629	}
	630	__initcall(sclp_detect_standby_memory);
	631
	632	#endif /* CONFIG_MEMORY_HOTPLUG */
	633
4b28a8fe HC	634	/*
	635	* Channel path configuration related functions.
	636	*/
	637
	638	#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
	639	#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
	640	#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
	641
	642	struct chp_cfg_sccb {
	643	struct sccb_header header;
	644	u8 ccm;
	645	u8 reserved[6];
	646	u8 cssid;
	647	} __attribute__((packed));
	648
	649	static int do_chp_configure(sclp_cmdw_t cmd)
	650	{
	651	struct chp_cfg_sccb *sccb;
	652	int rc;
	653
	654	if (!SCLP_HAS_CHP_RECONFIG)
	655	return -EOPNOTSUPP;
	656	/* Prepare sccb. */
	657	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	658	if (!sccb)
	659	return -ENOMEM;
	660	sccb->header.length = sizeof(*sccb);
	661	rc = do_sync_request(cmd, sccb);
	662	if (rc)
	663	goto out;
	664	switch (sccb->header.response_code) {
	665	case 0x0020:
	666	case 0x0120:
	667	case 0x0440:
	668	case 0x0450:
	669	break;
	670	default:
b3ff088b MS	671	pr_warning("configure channel-path failed "
	672	"(cmd=0x%08x, response=0x%04x)\n", cmd,
	673	sccb->header.response_code);
4b28a8fe HC	674	rc = -EIO;
	675	break;
	676	}
	677	out:
	678	free_page((unsigned long) sccb);
	679	return rc;
	680	}
	681
	682	/**
	683	* sclp_chp_configure - perform configure channel-path sclp command
	684	* @chpid: channel-path ID
	685	*
	686	* Perform configure channel-path command sclp command for specified chpid.
	687	* Return 0 after command successfully finished, non-zero otherwise.
	688	*/
	689	int sclp_chp_configure(struct chp_id chpid)
	690	{
	691	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH \| chpid.id << 8);
	692	}
	693
	694	/**
	695	* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
	696	* @chpid: channel-path ID
	697	*
	698	* Perform deconfigure channel-path command sclp command for specified chpid
	699	* and wait for completion. On success return 0. Return non-zero otherwise.
	700	*/
	701	int sclp_chp_deconfigure(struct chp_id chpid)
	702	{
	703	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH \| chpid.id << 8);
	704	}
	705
	706	struct chp_info_sccb {
	707	struct sccb_header header;
	708	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
	709	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
	710	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
	711	u8 ccm;
	712	u8 reserved[6];
	713	u8 cssid;
	714	} __attribute__((packed));
	715
	716	/**
	717	* sclp_chp_read_info - perform read channel-path information sclp command
	718	* @info: resulting channel-path information data
	719	*
	720	* Perform read channel-path information sclp command and wait for completion.
	721	* On success, store channel-path information in @info and return 0. Return
	722	* non-zero otherwise.
	723	*/
	724	int sclp_chp_read_info(struct sclp_chp_info *info)
	725	{
	726	struct chp_info_sccb *sccb;
	727	int rc;
	728
	729	if (!SCLP_HAS_CHP_INFO)
	730	return -EOPNOTSUPP;
	731	/* Prepare sccb. */
	732	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	733	if (!sccb)
	734	return -ENOMEM;
	735	sccb->header.length = sizeof(*sccb);
	736	rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
	737	if (rc)
738	goto out;
739	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	740	pr_warning("read channel-path info failed "
b3ff088b MS	741	"(response=0x%04x)\n", sccb->header.response_code);
4b28a8fe HC	742	rc = -EIO;
	743	goto out;
	744	}
	745	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
	746	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
	747	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
	748	out:
	749	free_page((unsigned long) sccb);
	750	return rc;
	751	}