[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 <asm/ctl_reg.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_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
			PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
	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.function_code = 0x80;
			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;

int arch_get_memory_phys_device(unsigned long start_pfn)
{
	if (!rzm)
		return 0;
	return PFN_PHYS(start_pfn) >> ilog2(rzm);
}

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++) {
			if (sccb->entries[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_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
		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;
	if (!standby)
		new_incr->usecount = 1;
	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 const 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>
a0616cde	24	#include <asm/ctl_reg.h>
08d07968	25
b3ff088b	26	#include "sclp.h"
08d07968 HC	27
	28	#define SCLP_CMDW_READ_SCP_INFO 0x00020001
	29	#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
	30
	31	struct read_info_sccb {
	32	struct sccb_header header; /* 0-7 */
	33	u16 rnmax; /* 8-9 */
	34	u8 rnsize; /* 10 */
	35	u8 _reserved0[24 - 11]; /* 11-15 */
	36	u8 loadparm[8]; /* 24-31 */
	37	u8 _reserved1[48 - 32]; /* 32-47 */
	38	u64 facilities; /* 48-55 */
	39	u8 _reserved2[84 - 56]; /* 56-83 */
	40	u8 fac84; /* 84 */
	41	u8 _reserved3[91 - 85]; /* 85-90 */
	42	u8 flags; /* 91 */
	43	u8 _reserved4[100 - 92]; /* 92-99 */
	44	u32 rnsize2; /* 100-103 */
	45	u64 rnmax2; /* 104-111 */
	46	u8 _reserved5[4096 - 112]; /* 112-4095 */
	47	} __attribute__((packed, aligned(PAGE_SIZE)));
	48
	49	static struct read_info_sccb __initdata early_read_info_sccb;
	50	static int __initdata early_read_info_sccb_valid;
	51
	52	u64 sclp_facilities;
	53	static u8 sclp_fac84;
e0bc2495 HC	54	static unsigned long long rzm;
e0bc2495 HC	55	static unsigned long long rnmax;
08d07968 HC	56
	57	static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
	58	{
	59	int rc;
	60
	61	__ctl_set_bit(0, 9);
	62	rc = sclp_service_call(cmd, sccb);
	63	if (rc)
	64	goto out;
b50511e4 MS	65	__load_psw_mask(PSW_DEFAULT_KEY \| PSW_MASK_BASE \| PSW_MASK_EA \|
b50511e4 MS	66	PSW_MASK_BA \| PSW_MASK_EXT \| PSW_MASK_WAIT);
08d07968 HC	67	local_irq_disable();
	68	out:
	69	/* Contents of the sccb might have changed. */
	70	barrier();
	71	__ctl_clear_bit(0, 9);
	72	return rc;
	73	}
	74
23d17421	75	static void __init sclp_read_info_early(void)
08d07968 HC	76	{
	77	int rc;
	78	int i;
	79	struct read_info_sccb *sccb;
	80	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
	81	SCLP_CMDW_READ_SCP_INFO};
	82
	83	sccb = &early_read_info_sccb;
	84	for (i = 0; i < ARRAY_SIZE(commands); i++) {
	85	do {
	86	memset(sccb, 0, sizeof(*sccb));
	87	sccb->header.length = sizeof(*sccb);
cb9d7160	88	sccb->header.function_code = 0x80;
08d07968 HC	89	sccb->header.control_mask[2] = 0x80;
	90	rc = sclp_cmd_sync_early(commands[i], sccb);
	91	} while (rc == -EBUSY);
	92
	93	if (rc)
	94	break;
	95	if (sccb->header.response_code == 0x10) {
	96	early_read_info_sccb_valid = 1;
	97	break;
	98	}
	99	if (sccb->header.response_code != 0x1f0)
	100	break;
	101	}
	102	}
	103
	104	void __init sclp_facilities_detect(void)
	105	{
08d07968 HC	106	struct read_info_sccb *sccb;
08d07968 HC	107
23d17421	108	sclp_read_info_early();
08d07968	109	if (!early_read_info_sccb_valid)
23d17421 HC	110	return;
23d17421 HC	111
08d07968	112	sccb = &early_read_info_sccb;
23d17421 HC	113	sclp_facilities = sccb->facilities;
23d17421 HC	114	sclp_fac84 = sccb->fac84;
e0bc2495 HC	115	rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	116	rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	117	rzm <<= 20;
23d17421 HC	118	}
	119
	120	unsigned long long sclp_get_rnmax(void)
	121	{
	122	return rnmax;
	123	}
	124
	125	unsigned long long sclp_get_rzm(void)
	126	{
	127	return rzm;
08d07968 HC	128	}
	129
	130	/*
23d17421 HC	131	* This function will be called after sclp_facilities_detect(), which gets
23d17421 HC	132	* called from early.c code. Therefore the sccb should have valid contents.
08d07968 HC	133	*/
	134	void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
	135	{
	136	struct read_info_sccb *sccb;
	137
	138	if (!early_read_info_sccb_valid)
	139	return;
	140	sccb = &early_read_info_sccb;
	141	info->is_valid = 1;
	142	if (sccb->flags & 0x2)
	143	info->has_dump = 1;
	144	memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
	145	}
	146
	147	static void sclp_sync_callback(struct sclp_req req, void data)
	148	{
	149	struct completion *completion = data;
	150
	151	complete(completion);
	152	}
	153
	154	static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
	155	{
	156	struct completion completion;
	157	struct sclp_req *request;
	158	int rc;
	159
	160	request = kzalloc(sizeof(*request), GFP_KERNEL);
	161	if (!request)
	162	return -ENOMEM;
	163	request->command = cmd;
	164	request->sccb = sccb;
	165	request->status = SCLP_REQ_FILLED;
	166	request->callback = sclp_sync_callback;
	167	request->callback_data = &completion;
	168	init_completion(&completion);
	169
	170	/* Perform sclp request. */
	171	rc = sclp_add_request(request);
	172	if (rc)
	173	goto out;
	174	wait_for_completion(&completion);
	175
	176	/* Check response. */
	177	if (request->status != SCLP_REQ_DONE) {
b3ff088b MS	178	pr_warning("sync request failed (cmd=0x%08x, "
b3ff088b MS	179	"status=0x%02x)\n", cmd, request->status);
08d07968 HC	180	rc = -EIO;
	181	}
	182	out:
	183	kfree(request);
	184	return rc;
	185	}
	186
	187	/*
	188	* CPU configuration related functions.
	189	*/
	190
	191	#define SCLP_CMDW_READ_CPU_INFO 0x00010001
	192	#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
	193	#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
	194
	195	struct read_cpu_info_sccb {
	196	struct sccb_header header;
	197	u16 nr_configured;
	198	u16 offset_configured;
	199	u16 nr_standby;
	200	u16 offset_standby;
	201	u8 reserved[4096 - 16];
	202	} __attribute__((packed, aligned(PAGE_SIZE)));
	203
08d07968 HC	204	static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
	205	struct read_cpu_info_sccb *sccb)
	206	{
	207	char page = (char ) sccb;
	208
	209	memset(info, 0, sizeof(*info));
	210	info->configured = sccb->nr_configured;
	211	info->standby = sccb->nr_standby;
	212	info->combined = sccb->nr_configured + sccb->nr_standby;
	213	info->has_cpu_type = sclp_fac84 & 0x1;
	214	memcpy(&info->cpu, page + sccb->offset_configured,
	215	info->combined * sizeof(struct sclp_cpu_entry));
	216	}
	217
48483b32	218	int sclp_get_cpu_info(struct sclp_cpu_info *info)
08d07968 HC	219	{
	220	int rc;
	221	struct read_cpu_info_sccb *sccb;
	222
	223	if (!SCLP_HAS_CPU_INFO)
	224	return -EOPNOTSUPP;
48483b32	225	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
08d07968 HC	226	if (!sccb)
08d07968 HC	227	return -ENOMEM;
08d07968 HC	228	sccb->header.length = sizeof(*sccb);
	229	rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
	230	if (rc)
	231	goto out;
	232	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	233	pr_warning("readcpuinfo failed (response=0x%04x)\n",
b3ff088b MS	234	sccb->header.response_code);
08d07968 HC	235	rc = -EIO;
	236	goto out;
	237	}
	238	sclp_fill_cpu_info(info, sccb);
	239	out:
	240	free_page((unsigned long) sccb);
	241	return rc;
	242	}
	243
08d07968 HC	244	struct cpu_configure_sccb {
	245	struct sccb_header header;
	246	} __attribute__((packed, aligned(8)));
	247
	248	static int do_cpu_configure(sclp_cmdw_t cmd)
	249	{
	250	struct cpu_configure_sccb *sccb;
	251	int rc;
	252
	253	if (!SCLP_HAS_CPU_RECONFIG)
	254	return -EOPNOTSUPP;
	255	/*
	256	* This is not going to cross a page boundary since we force
	257	* kmalloc to have a minimum alignment of 8 bytes on s390.
	258	*/
	259	sccb = kzalloc(sizeof(*sccb), GFP_KERNEL \| GFP_DMA);
	260	if (!sccb)
	261	return -ENOMEM;
	262	sccb->header.length = sizeof(*sccb);
	263	rc = do_sync_request(cmd, sccb);
	264	if (rc)
	265	goto out;
	266	switch (sccb->header.response_code) {
	267	case 0x0020:
	268	case 0x0120:
	269	break;
	270	default:
b3ff088b MS	271	pr_warning("configure cpu failed (cmd=0x%08x, "
	272	"response=0x%04x)\n", cmd,
	273	sccb->header.response_code);
08d07968 HC	274	rc = -EIO;
	275	break;
	276	}
	277	out:
	278	kfree(sccb);
	279	return rc;
	280	}
	281
	282	int sclp_cpu_configure(u8 cpu)
	283	{
	284	return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU \| cpu << 8);
	285	}
	286
	287	int sclp_cpu_deconfigure(u8 cpu)
	288	{
	289	return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU \| cpu << 8);
	290	}
4b28a8fe	291
e0bc2495 HC	292	#ifdef CONFIG_MEMORY_HOTPLUG
	293
	294	static DEFINE_MUTEX(sclp_mem_mutex);
	295	static LIST_HEAD(sclp_mem_list);
	296	static u8 sclp_max_storage_id;
	297	static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
03997904	298	static int sclp_mem_state_changed;
e0bc2495 HC	299
	300	struct memory_increment {
	301	struct list_head list;
	302	u16 rn;
	303	int standby;
	304	int usecount;
	305	};
	306
	307	struct assign_storage_sccb {
	308	struct sccb_header header;
	309	u16 rn;
	310	} __packed;
	311
9c95258c HC	312	int arch_get_memory_phys_device(unsigned long start_pfn)
	313	{
	314	if (!rzm)
	315	return 0;
	316	return PFN_PHYS(start_pfn) >> ilog2(rzm);
	317	}
	318
e0bc2495 HC	319	static unsigned long long rn2addr(u16 rn)
	320	{
	321	return (unsigned long long) (rn - 1) * rzm;
	322	}
	323
	324	static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
	325	{
	326	struct assign_storage_sccb *sccb;
	327	int rc;
	328
	329	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	330	if (!sccb)
	331	return -ENOMEM;
	332	sccb->header.length = PAGE_SIZE;
	333	sccb->rn = rn;
	334	rc = do_sync_request(cmd, sccb);
	335	if (rc)
	336	goto out;
	337	switch (sccb->header.response_code) {
	338	case 0x0020:
	339	case 0x0120:
	340	break;
	341	default:
675be97a HC	342	pr_warning("assign storage failed (cmd=0x%08x, "
	343	"response=0x%04x, rn=0x%04x)\n", cmd,
	344	sccb->header.response_code, rn);
e0bc2495 HC	345	rc = -EIO;
	346	break;
	347	}
	348	out:
	349	free_page((unsigned long) sccb);
	350	return rc;
	351	}
	352
	353	static int sclp_assign_storage(u16 rn)
	354	{
	355	return do_assign_storage(0x000d0001, rn);
	356	}
	357
	358	static int sclp_unassign_storage(u16 rn)
	359	{
	360	return do_assign_storage(0x000c0001, rn);
	361	}
	362
	363	struct attach_storage_sccb {
	364	struct sccb_header header;
	365	u16 :16;
	366	u16 assigned;
	367	u32 :32;
	368	u32 entries[0];
	369	} __packed;
	370
	371	static int sclp_attach_storage(u8 id)
	372	{
	373	struct attach_storage_sccb *sccb;
	374	int rc;
	375	int i;
	376
	377	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	378	if (!sccb)
	379	return -ENOMEM;
	380	sccb->header.length = PAGE_SIZE;
	381	rc = do_sync_request(0x00080001 \| id << 8, sccb);
	382	if (rc)
	383	goto out;
	384	switch (sccb->header.response_code) {
	385	case 0x0020:
	386	set_bit(id, sclp_storage_ids);
8adb4ca3 HC	387	for (i = 0; i < sccb->assigned; i++) {
	388	if (sccb->entries[i])
	389	sclp_unassign_storage(sccb->entries[i] >> 16);
	390	}
e0bc2495 HC	391	break;
	392	default:
	393	rc = -EIO;
	394	break;
	395	}
	396	out:
	397	free_page((unsigned long) sccb);
	398	return rc;
	399	}
	400
	401	static int sclp_mem_change_state(unsigned long start, unsigned long size,
	402	int online)
	403	{
	404	struct memory_increment *incr;
	405	unsigned long long istart;
	406	int rc = 0;
	407
	408	list_for_each_entry(incr, &sclp_mem_list, list) {
	409	istart = rn2addr(incr->rn);
	410	if (start + size - 1 < istart)
	411	break;
	412	if (start > istart + rzm - 1)
	413	continue;
	414	if (online) {
	415	if (incr->usecount++)
	416	continue;
	417	/*
	418	* Don't break the loop if one assign fails. Loop may
	419	* be walked again on CANCEL and we can't save
	420	* information if state changed before or not.
	421	* So continue and increase usecount for all increments.
	422	*/
	423	rc \|= sclp_assign_storage(incr->rn);
	424	} else {
	425	if (--incr->usecount)
	426	continue;
	427	sclp_unassign_storage(incr->rn);
	428	}
	429	}
	430	return rc ? -EIO : 0;
	431	}
	432
	433	static int sclp_mem_notifier(struct notifier_block *nb,
	434	unsigned long action, void *data)
	435	{
	436	unsigned long start, size;
	437	struct memory_notify *arg;
	438	unsigned char id;
	439	int rc = 0;
	440
	441	arg = data;
	442	start = arg->start_pfn << PAGE_SHIFT;
	443	size = arg->nr_pages << PAGE_SHIFT;
	444	mutex_lock(&sclp_mem_mutex);
fc89db4b AM	445	for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
fc89db4b AM	446	sclp_attach_storage(id);
e0bc2495 HC	447	switch (action) {
e0bc2495 HC	448	case MEM_ONLINE:
7e9238fb GS	449	case MEM_GOING_OFFLINE:
7e9238fb GS	450	case MEM_CANCEL_OFFLINE:
e0bc2495 HC	451	break;
	452	case MEM_GOING_ONLINE:
	453	rc = sclp_mem_change_state(start, size, 1);
	454	break;
	455	case MEM_CANCEL_ONLINE:
	456	sclp_mem_change_state(start, size, 0);
	457	break;
7e9238fb GS	458	case MEM_OFFLINE:
	459	sclp_mem_change_state(start, size, 0);
	460	break;
e0bc2495 HC	461	default:
	462	rc = -EINVAL;
	463	break;
	464	}
03997904 GS	465	if (!rc)
03997904 GS	466	sclp_mem_state_changed = 1;
e0bc2495 HC	467	mutex_unlock(&sclp_mem_mutex);
	468	return rc ? NOTIFY_BAD : NOTIFY_OK;
	469	}
	470
	471	static struct notifier_block sclp_mem_nb = {
	472	.notifier_call = sclp_mem_notifier,
	473	};
	474
	475	static void __init add_memory_merged(u16 rn)
	476	{
	477	static u16 first_rn, num;
	478	unsigned long long start, size;
	479
	480	if (rn && first_rn && (first_rn + num == rn)) {
	481	num++;
	482	return;
	483	}
	484	if (!first_rn)
	485	goto skip_add;
	486	start = rn2addr(first_rn);
	487	size = (unsigned long long ) num * rzm;
	488	if (start >= VMEM_MAX_PHYS)
	489	goto skip_add;
	490	if (start + size > VMEM_MAX_PHYS)
	491	size = VMEM_MAX_PHYS - start;
23d75d9c HC	492	if (memory_end_set && (start >= memory_end))
	493	goto skip_add;
	494	if (memory_end_set && (start + size > memory_end))
	495	size = memory_end - start;
e0bc2495 HC	496	add_memory(0, start, size);
	497	skip_add:
	498	first_rn = rn;
	499	num = 1;
	500	}
	501
	502	static void __init sclp_add_standby_memory(void)
	503	{
	504	struct memory_increment *incr;
	505
	506	list_for_each_entry(incr, &sclp_mem_list, list)
	507	if (incr->standby)
	508	add_memory_merged(incr->rn);
	509	add_memory_merged(0);
	510	}
	511
	512	static void __init insert_increment(u16 rn, int standby, int assigned)
	513	{
	514	struct memory_increment incr, new_incr;
	515	struct list_head *prev;
	516	u16 last_rn;
	517
	518	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	519	if (!new_incr)
	520	return;
	521	new_incr->rn = rn;
	522	new_incr->standby = standby;
fdb1bb15 HC	523	if (!standby)
fdb1bb15 HC	524	new_incr->usecount = 1;
e0bc2495 HC	525	last_rn = 0;
	526	prev = &sclp_mem_list;
	527	list_for_each_entry(incr, &sclp_mem_list, list) {
	528	if (assigned && incr->rn > rn)
	529	break;
	530	if (!assigned && incr->rn - last_rn > 1)
	531	break;
	532	last_rn = incr->rn;
	533	prev = &incr->list;
	534	}
	535	if (!assigned)
	536	new_incr->rn = last_rn + 1;
	537	if (new_incr->rn > rnmax) {
	538	kfree(new_incr);
	539	return;
	540	}
	541	list_add(&new_incr->list, prev);
	542	}
	543
03997904 GS	544	static int sclp_mem_freeze(struct device *dev)
	545	{
	546	if (!sclp_mem_state_changed)
	547	return 0;
	548	pr_err("Memory hotplug state changed, suspend refused.\n");
	549	return -EPERM;
	550	}
	551
e0bc2495 HC	552	struct read_storage_sccb {
	553	struct sccb_header header;
	554	u16 max_id;
	555	u16 assigned;
	556	u16 standby;
	557	u16 :16;
	558	u32 entries[0];
	559	} __packed;
	560
47145210	561	static const struct dev_pm_ops sclp_mem_pm_ops = {
03997904 GS	562	.freeze = sclp_mem_freeze,
	563	};
	564
	565	static struct platform_driver sclp_mem_pdrv = {
	566	.driver = {
	567	.name = "sclp_mem",
	568	.pm = &sclp_mem_pm_ops,
	569	},
	570	};
	571
e0bc2495 HC	572	static int __init sclp_detect_standby_memory(void)
e0bc2495 HC	573	{
03997904	574	struct platform_device *sclp_pdev;
e0bc2495 HC	575	struct read_storage_sccb *sccb;
	576	int i, id, assigned, rc;
	577
	578	if (!early_read_info_sccb_valid)
	579	return 0;
	580	if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
	581	return 0;
	582	rc = -ENOMEM;
	583	sccb = (void *) __get_free_page(GFP_KERNEL \| GFP_DMA);
	584	if (!sccb)
	585	goto out;
	586	assigned = 0;
	587	for (id = 0; id <= sclp_max_storage_id; id++) {
	588	memset(sccb, 0, PAGE_SIZE);
	589	sccb->header.length = PAGE_SIZE;
	590	rc = do_sync_request(0x00040001 \| id << 8, sccb);
	591	if (rc)
	592	goto out;
	593	switch (sccb->header.response_code) {
	594	case 0x0010:
	595	set_bit(id, sclp_storage_ids);
	596	for (i = 0; i < sccb->assigned; i++) {
	597	if (!sccb->entries[i])
	598	continue;
	599	assigned++;
	600	insert_increment(sccb->entries[i] >> 16, 0, 1);
	601	}
	602	break;
	603	case 0x0310:
	604	break;
	605	case 0x0410:
	606	for (i = 0; i < sccb->assigned; i++) {
	607	if (!sccb->entries[i])
	608	continue;
	609	assigned++;
	610	insert_increment(sccb->entries[i] >> 16, 1, 1);
	611	}
	612	break;
	613	default:
	614	rc = -EIO;
	615	break;
	616	}
	617	if (!rc)
	618	sclp_max_storage_id = sccb->max_id;
	619	}
	620	if (rc \|\| list_empty(&sclp_mem_list))
	621	goto out;
	622	for (i = 1; i <= rnmax - assigned; i++)
	623	insert_increment(0, 1, 0);
	624	rc = register_memory_notifier(&sclp_mem_nb);
	625	if (rc)
	626	goto out;
03997904 GS	627	rc = platform_driver_register(&sclp_mem_pdrv);
	628	if (rc)
	629	goto out;
	630	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
	631	rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
	632	if (rc)
	633	goto out_driver;
e0bc2495	634	sclp_add_standby_memory();
03997904 GS	635	goto out;
	636	out_driver:
	637	platform_driver_unregister(&sclp_mem_pdrv);
e0bc2495 HC	638	out:
	639	free_page((unsigned long) sccb);
	640	return rc;
	641	}
	642	__initcall(sclp_detect_standby_memory);
	643
	644	#endif /* CONFIG_MEMORY_HOTPLUG */
	645
4b28a8fe HC	646	/*
	647	* Channel path configuration related functions.
	648	*/
	649
	650	#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
	651	#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
	652	#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
	653
	654	struct chp_cfg_sccb {
	655	struct sccb_header header;
	656	u8 ccm;
	657	u8 reserved[6];
	658	u8 cssid;
	659	} __attribute__((packed));
	660
	661	static int do_chp_configure(sclp_cmdw_t cmd)
	662	{
	663	struct chp_cfg_sccb *sccb;
	664	int rc;
	665
	666	if (!SCLP_HAS_CHP_RECONFIG)
	667	return -EOPNOTSUPP;
	668	/* Prepare sccb. */
	669	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	670	if (!sccb)
	671	return -ENOMEM;
	672	sccb->header.length = sizeof(*sccb);
	673	rc = do_sync_request(cmd, sccb);
	674	if (rc)
	675	goto out;
	676	switch (sccb->header.response_code) {
	677	case 0x0020:
	678	case 0x0120:
	679	case 0x0440:
	680	case 0x0450:
	681	break;
	682	default:
b3ff088b MS	683	pr_warning("configure channel-path failed "
	684	"(cmd=0x%08x, response=0x%04x)\n", cmd,
	685	sccb->header.response_code);
4b28a8fe HC	686	rc = -EIO;
	687	break;
	688	}
	689	out:
	690	free_page((unsigned long) sccb);
	691	return rc;
	692	}
	693
	694	/**
	695	* sclp_chp_configure - perform configure channel-path sclp command
	696	* @chpid: channel-path ID
	697	*
	698	* Perform configure channel-path command sclp command for specified chpid.
	699	* Return 0 after command successfully finished, non-zero otherwise.
	700	*/
	701	int sclp_chp_configure(struct chp_id chpid)
	702	{
	703	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH \| chpid.id << 8);
	704	}
	705
	706	/**
	707	* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
	708	* @chpid: channel-path ID
	709	*
	710	* Perform deconfigure channel-path command sclp command for specified chpid
	711	* and wait for completion. On success return 0. Return non-zero otherwise.
	712	*/
	713	int sclp_chp_deconfigure(struct chp_id chpid)
	714	{
	715	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH \| chpid.id << 8);
	716	}
	717
	718	struct chp_info_sccb {
	719	struct sccb_header header;
	720	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
	721	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
	722	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
	723	u8 ccm;
	724	u8 reserved[6];
	725	u8 cssid;
	726	} __attribute__((packed));
	727
	728	/**
	729	* sclp_chp_read_info - perform read channel-path information sclp command
	730	* @info: resulting channel-path information data
	731	*
	732	* Perform read channel-path information sclp command and wait for completion.
	733	* On success, store channel-path information in @info and return 0. Return
	734	* non-zero otherwise.
	735	*/
	736	int sclp_chp_read_info(struct sclp_chp_info *info)
	737	{
	738	struct chp_info_sccb *sccb;
	739	int rc;
	740
	741	if (!SCLP_HAS_CHP_INFO)
	742	return -EOPNOTSUPP;
	743	/* Prepare sccb. */
	744	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	745	if (!sccb)
	746	return -ENOMEM;
	747	sccb->header.length = sizeof(*sccb);
	748	rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
	749	if (rc)
750	goto out;
751	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	752	pr_warning("read channel-path info failed "
b3ff088b MS	753	"(response=0x%04x)\n", sccb->header.response_code);
4b28a8fe HC	754	rc = -EIO;
	755	goto out;
	756	}
	757	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
	758	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
	759	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
	760	out:
	761	free_page((unsigned long) sccb);
	762	return rc;
	763	}