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

/*
 * Copyright IBM Corp. 2007, 2009
 *
 * Author(s): Heiko Carstens <[email protected]>,
 *	      Peter Oberparleiter <[email protected]>
 */

#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.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++)
			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 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 <[email protected]>,
03997904 GS	5	* Peter Oberparleiter <[email protected]>
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);
cb9d7160	87	sccb->header.function_code = 0x80;
08d07968 HC	88	sccb->header.control_mask[2] = 0x80;
	89	rc = sclp_cmd_sync_early(commands[i], sccb);
	90	} while (rc == -EBUSY);
	91
	92	if (rc)
	93	break;
	94	if (sccb->header.response_code == 0x10) {
	95	early_read_info_sccb_valid = 1;
	96	break;
	97	}
	98	if (sccb->header.response_code != 0x1f0)
	99	break;
	100	}
	101	}
	102
	103	void __init sclp_facilities_detect(void)
	104	{
08d07968 HC	105	struct read_info_sccb *sccb;
08d07968 HC	106
23d17421	107	sclp_read_info_early();
08d07968	108	if (!early_read_info_sccb_valid)
23d17421 HC	109	return;
23d17421 HC	110
08d07968	111	sccb = &early_read_info_sccb;
23d17421 HC	112	sclp_facilities = sccb->facilities;
23d17421 HC	113	sclp_fac84 = sccb->fac84;
e0bc2495 HC	114	rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
	115	rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
	116	rzm <<= 20;
23d17421 HC	117	}
	118
	119	unsigned long long sclp_get_rnmax(void)
	120	{
	121	return rnmax;
	122	}
	123
	124	unsigned long long sclp_get_rzm(void)
	125	{
	126	return rzm;
08d07968 HC	127	}
	128
	129	/*
23d17421 HC	130	* This function will be called after sclp_facilities_detect(), which gets
23d17421 HC	131	* called from early.c code. Therefore the sccb should have valid contents.
08d07968 HC	132	*/
	133	void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
	134	{
	135	struct read_info_sccb *sccb;
	136
	137	if (!early_read_info_sccb_valid)
	138	return;
	139	sccb = &early_read_info_sccb;
	140	info->is_valid = 1;
	141	if (sccb->flags & 0x2)
	142	info->has_dump = 1;
	143	memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
	144	}
	145
	146	static void sclp_sync_callback(struct sclp_req req, void data)
	147	{
	148	struct completion *completion = data;
	149
	150	complete(completion);
	151	}
	152
	153	static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
	154	{
	155	struct completion completion;
	156	struct sclp_req *request;
	157	int rc;
	158
	159	request = kzalloc(sizeof(*request), GFP_KERNEL);
	160	if (!request)
	161	return -ENOMEM;
	162	request->command = cmd;
	163	request->sccb = sccb;
	164	request->status = SCLP_REQ_FILLED;
	165	request->callback = sclp_sync_callback;
	166	request->callback_data = &completion;
	167	init_completion(&completion);
	168
	169	/* Perform sclp request. */
	170	rc = sclp_add_request(request);
	171	if (rc)
	172	goto out;
	173	wait_for_completion(&completion);
	174
	175	/* Check response. */
	176	if (request->status != SCLP_REQ_DONE) {
b3ff088b MS	177	pr_warning("sync request failed (cmd=0x%08x, "
b3ff088b MS	178	"status=0x%02x)\n", cmd, request->status);
08d07968 HC	179	rc = -EIO;
	180	}
	181	out:
	182	kfree(request);
	183	return rc;
	184	}
	185
	186	/*
	187	* CPU configuration related functions.
	188	*/
	189
	190	#define SCLP_CMDW_READ_CPU_INFO 0x00010001
	191	#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
	192	#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
	193
	194	struct read_cpu_info_sccb {
	195	struct sccb_header header;
	196	u16 nr_configured;
	197	u16 offset_configured;
	198	u16 nr_standby;
	199	u16 offset_standby;
	200	u8 reserved[4096 - 16];
	201	} __attribute__((packed, aligned(PAGE_SIZE)));
	202
08d07968 HC	203	static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
	204	struct read_cpu_info_sccb *sccb)
	205	{
	206	char page = (char ) sccb;
	207
	208	memset(info, 0, sizeof(*info));
	209	info->configured = sccb->nr_configured;
	210	info->standby = sccb->nr_standby;
	211	info->combined = sccb->nr_configured + sccb->nr_standby;
	212	info->has_cpu_type = sclp_fac84 & 0x1;
	213	memcpy(&info->cpu, page + sccb->offset_configured,
	214	info->combined * sizeof(struct sclp_cpu_entry));
	215	}
	216
48483b32	217	int sclp_get_cpu_info(struct sclp_cpu_info *info)
08d07968 HC	218	{
	219	int rc;
	220	struct read_cpu_info_sccb *sccb;
	221
	222	if (!SCLP_HAS_CPU_INFO)
	223	return -EOPNOTSUPP;
48483b32	224	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
08d07968 HC	225	if (!sccb)
08d07968 HC	226	return -ENOMEM;
08d07968 HC	227	sccb->header.length = sizeof(*sccb);
	228	rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
	229	if (rc)
	230	goto out;
	231	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	232	pr_warning("readcpuinfo failed (response=0x%04x)\n",
b3ff088b MS	233	sccb->header.response_code);
08d07968 HC	234	rc = -EIO;
	235	goto out;
	236	}
	237	sclp_fill_cpu_info(info, sccb);
	238	out:
	239	free_page((unsigned long) sccb);
	240	return rc;
	241	}
	242
08d07968 HC	243	struct cpu_configure_sccb {
	244	struct sccb_header header;
	245	} __attribute__((packed, aligned(8)));
	246
	247	static int do_cpu_configure(sclp_cmdw_t cmd)
	248	{
	249	struct cpu_configure_sccb *sccb;
	250	int rc;
	251
	252	if (!SCLP_HAS_CPU_RECONFIG)
	253	return -EOPNOTSUPP;
	254	/*
	255	* This is not going to cross a page boundary since we force
	256	* kmalloc to have a minimum alignment of 8 bytes on s390.
	257	*/
	258	sccb = kzalloc(sizeof(*sccb), GFP_KERNEL \| GFP_DMA);
	259	if (!sccb)
	260	return -ENOMEM;
	261	sccb->header.length = sizeof(*sccb);
	262	rc = do_sync_request(cmd, sccb);
	263	if (rc)
	264	goto out;
	265	switch (sccb->header.response_code) {
	266	case 0x0020:
	267	case 0x0120:
	268	break;
	269	default:
b3ff088b MS	270	pr_warning("configure cpu failed (cmd=0x%08x, "
	271	"response=0x%04x)\n", cmd,
	272	sccb->header.response_code);
08d07968 HC	273	rc = -EIO;
	274	break;
	275	}
	276	out:
	277	kfree(sccb);
	278	return rc;
	279	}
	280
	281	int sclp_cpu_configure(u8 cpu)
	282	{
	283	return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU \| cpu << 8);
	284	}
	285
	286	int sclp_cpu_deconfigure(u8 cpu)
	287	{
	288	return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU \| cpu << 8);
	289	}
4b28a8fe	290
e0bc2495 HC	291	#ifdef CONFIG_MEMORY_HOTPLUG
	292
	293	static DEFINE_MUTEX(sclp_mem_mutex);
	294	static LIST_HEAD(sclp_mem_list);
	295	static u8 sclp_max_storage_id;
	296	static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
03997904	297	static int sclp_mem_state_changed;
e0bc2495 HC	298
	299	struct memory_increment {
	300	struct list_head list;
	301	u16 rn;
	302	int standby;
	303	int usecount;
	304	};
	305
	306	struct assign_storage_sccb {
	307	struct sccb_header header;
	308	u16 rn;
	309	} __packed;
	310
9c95258c HC	311	int arch_get_memory_phys_device(unsigned long start_pfn)
	312	{
	313	if (!rzm)
	314	return 0;
	315	return PFN_PHYS(start_pfn) >> ilog2(rzm);
	316	}
	317
e0bc2495 HC	318	static unsigned long long rn2addr(u16 rn)
	319	{
	320	return (unsigned long long) (rn - 1) * rzm;
	321	}
	322
	323	static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
	324	{
	325	struct assign_storage_sccb *sccb;
	326	int rc;
	327
	328	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	329	if (!sccb)
	330	return -ENOMEM;
	331	sccb->header.length = PAGE_SIZE;
	332	sccb->rn = rn;
	333	rc = do_sync_request(cmd, sccb);
	334	if (rc)
	335	goto out;
	336	switch (sccb->header.response_code) {
	337	case 0x0020:
	338	case 0x0120:
	339	break;
	340	default:
675be97a HC	341	pr_warning("assign storage failed (cmd=0x%08x, "
	342	"response=0x%04x, rn=0x%04x)\n", cmd,
	343	sccb->header.response_code, rn);
e0bc2495 HC	344	rc = -EIO;
	345	break;
	346	}
	347	out:
	348	free_page((unsigned long) sccb);
	349	return rc;
	350	}
	351
	352	static int sclp_assign_storage(u16 rn)
	353	{
	354	return do_assign_storage(0x000d0001, rn);
	355	}
	356
	357	static int sclp_unassign_storage(u16 rn)
	358	{
	359	return do_assign_storage(0x000c0001, rn);
	360	}
	361
	362	struct attach_storage_sccb {
	363	struct sccb_header header;
	364	u16 :16;
	365	u16 assigned;
	366	u32 :32;
	367	u32 entries[0];
	368	} __packed;
	369
	370	static int sclp_attach_storage(u8 id)
	371	{
	372	struct attach_storage_sccb *sccb;
	373	int rc;
	374	int i;
	375
	376	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	377	if (!sccb)
	378	return -ENOMEM;
	379	sccb->header.length = PAGE_SIZE;
	380	rc = do_sync_request(0x00080001 \| id << 8, sccb);
	381	if (rc)
	382	goto out;
	383	switch (sccb->header.response_code) {
	384	case 0x0020:
	385	set_bit(id, sclp_storage_ids);
	386	for (i = 0; i < sccb->assigned; i++)
	387	sclp_unassign_storage(sccb->entries[i] >> 16);
	388	break;
	389	default:
	390	rc = -EIO;
	391	break;
	392	}
	393	out:
	394	free_page((unsigned long) sccb);
	395	return rc;
	396	}
	397
	398	static int sclp_mem_change_state(unsigned long start, unsigned long size,
	399	int online)
	400	{
	401	struct memory_increment *incr;
	402	unsigned long long istart;
	403	int rc = 0;
	404
	405	list_for_each_entry(incr, &sclp_mem_list, list) {
	406	istart = rn2addr(incr->rn);
	407	if (start + size - 1 < istart)
408	break;
409	if (start > istart + rzm - 1)
410	continue;
411	if (online) {
412	if (incr->usecount++)
413	continue;
414	/*
415	* Don't break the loop if one assign fails. Loop may
416	* be walked again on CANCEL and we can't save
417	* information if state changed before or not.
418	* So continue and increase usecount for all increments.
419	*/
420	rc \|= sclp_assign_storage(incr->rn);
421	} else {
422	if (--incr->usecount)
423	continue;
424	sclp_unassign_storage(incr->rn);
425	}
426	}
427	return rc ? -EIO : 0;
428	}
429
430	static int sclp_mem_notifier(struct notifier_block *nb,
431	unsigned long action, void *data)
432	{
433	unsigned long start, size;
434	struct memory_notify *arg;
435	unsigned char id;
436	int rc = 0;
437
438	arg = data;
439	start = arg->start_pfn << PAGE_SHIFT;
440	size = arg->nr_pages << PAGE_SHIFT;
441	mutex_lock(&sclp_mem_mutex);
442	for (id = 0; id <= sclp_max_storage_id; id++)
443	if (!test_bit(id, sclp_storage_ids))
444	sclp_attach_storage(id);
445	switch (action) {
446	case MEM_ONLINE:
7e9238fb GS	447	case MEM_GOING_OFFLINE:
7e9238fb GS	448	case MEM_CANCEL_OFFLINE:
e0bc2495 HC	449	break;
	450	case MEM_GOING_ONLINE:
	451	rc = sclp_mem_change_state(start, size, 1);
	452	break;
	453	case MEM_CANCEL_ONLINE:
	454	sclp_mem_change_state(start, size, 0);
	455	break;
7e9238fb GS	456	case MEM_OFFLINE:
	457	sclp_mem_change_state(start, size, 0);
	458	break;
e0bc2495 HC	459	default:
	460	rc = -EINVAL;
	461	break;
	462	}
03997904 GS	463	if (!rc)
03997904 GS	464	sclp_mem_state_changed = 1;
e0bc2495 HC	465	mutex_unlock(&sclp_mem_mutex);
	466	return rc ? NOTIFY_BAD : NOTIFY_OK;
	467	}
	468
	469	static struct notifier_block sclp_mem_nb = {
	470	.notifier_call = sclp_mem_notifier,
	471	};
	472
	473	static void __init add_memory_merged(u16 rn)
	474	{
	475	static u16 first_rn, num;
	476	unsigned long long start, size;
	477
	478	if (rn && first_rn && (first_rn + num == rn)) {
	479	num++;
	480	return;
	481	}
	482	if (!first_rn)
	483	goto skip_add;
	484	start = rn2addr(first_rn);
	485	size = (unsigned long long ) num * rzm;
	486	if (start >= VMEM_MAX_PHYS)
	487	goto skip_add;
	488	if (start + size > VMEM_MAX_PHYS)
	489	size = VMEM_MAX_PHYS - start;
23d75d9c HC	490	if (memory_end_set && (start >= memory_end))
	491	goto skip_add;
	492	if (memory_end_set && (start + size > memory_end))
	493	size = memory_end - start;
e0bc2495 HC	494	add_memory(0, start, size);
	495	skip_add:
	496	first_rn = rn;
	497	num = 1;
	498	}
	499
	500	static void __init sclp_add_standby_memory(void)
	501	{
	502	struct memory_increment *incr;
	503
	504	list_for_each_entry(incr, &sclp_mem_list, list)
	505	if (incr->standby)
	506	add_memory_merged(incr->rn);
	507	add_memory_merged(0);
	508	}
	509
	510	static void __init insert_increment(u16 rn, int standby, int assigned)
	511	{
	512	struct memory_increment incr, new_incr;
	513	struct list_head *prev;
	514	u16 last_rn;
	515
	516	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	517	if (!new_incr)
	518	return;
	519	new_incr->rn = rn;
	520	new_incr->standby = standby;
	521	last_rn = 0;
	522	prev = &sclp_mem_list;
	523	list_for_each_entry(incr, &sclp_mem_list, list) {
	524	if (assigned && incr->rn > rn)
	525	break;
	526	if (!assigned && incr->rn - last_rn > 1)
	527	break;
	528	last_rn = incr->rn;
	529	prev = &incr->list;
	530	}
	531	if (!assigned)
	532	new_incr->rn = last_rn + 1;
	533	if (new_incr->rn > rnmax) {
	534	kfree(new_incr);
	535	return;
	536	}
	537	list_add(&new_incr->list, prev);
	538	}
	539
03997904 GS	540	static int sclp_mem_freeze(struct device *dev)
	541	{
	542	if (!sclp_mem_state_changed)
	543	return 0;
	544	pr_err("Memory hotplug state changed, suspend refused.\n");
	545	return -EPERM;
	546	}
	547
e0bc2495 HC	548	struct read_storage_sccb {
	549	struct sccb_header header;
	550	u16 max_id;
	551	u16 assigned;
	552	u16 standby;
	553	u16 :16;
	554	u32 entries[0];
	555	} __packed;
	556
47145210	557	static const struct dev_pm_ops sclp_mem_pm_ops = {
03997904 GS	558	.freeze = sclp_mem_freeze,
	559	};
	560
	561	static struct platform_driver sclp_mem_pdrv = {
	562	.driver = {
	563	.name = "sclp_mem",
	564	.pm = &sclp_mem_pm_ops,
	565	},
	566	};
	567
e0bc2495 HC	568	static int __init sclp_detect_standby_memory(void)
e0bc2495 HC	569	{
03997904	570	struct platform_device *sclp_pdev;
e0bc2495 HC	571	struct read_storage_sccb *sccb;
	572	int i, id, assigned, rc;
	573
	574	if (!early_read_info_sccb_valid)
	575	return 0;
	576	if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
	577	return 0;
	578	rc = -ENOMEM;
	579	sccb = (void *) __get_free_page(GFP_KERNEL \| GFP_DMA);
	580	if (!sccb)
	581	goto out;
	582	assigned = 0;
	583	for (id = 0; id <= sclp_max_storage_id; id++) {
	584	memset(sccb, 0, PAGE_SIZE);
	585	sccb->header.length = PAGE_SIZE;
	586	rc = do_sync_request(0x00040001 \| id << 8, sccb);
	587	if (rc)
	588	goto out;
	589	switch (sccb->header.response_code) {
	590	case 0x0010:
	591	set_bit(id, sclp_storage_ids);
	592	for (i = 0; i < sccb->assigned; i++) {
	593	if (!sccb->entries[i])
	594	continue;
	595	assigned++;
	596	insert_increment(sccb->entries[i] >> 16, 0, 1);
	597	}
	598	break;
	599	case 0x0310:
	600	break;
	601	case 0x0410:
	602	for (i = 0; i < sccb->assigned; i++) {
	603	if (!sccb->entries[i])
	604	continue;
	605	assigned++;
	606	insert_increment(sccb->entries[i] >> 16, 1, 1);
	607	}
	608	break;
	609	default:
	610	rc = -EIO;
	611	break;
	612	}
	613	if (!rc)
	614	sclp_max_storage_id = sccb->max_id;
	615	}
	616	if (rc \|\| list_empty(&sclp_mem_list))
	617	goto out;
	618	for (i = 1; i <= rnmax - assigned; i++)
	619	insert_increment(0, 1, 0);
	620	rc = register_memory_notifier(&sclp_mem_nb);
	621	if (rc)
	622	goto out;
03997904 GS	623	rc = platform_driver_register(&sclp_mem_pdrv);
	624	if (rc)
	625	goto out;
	626	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
	627	rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
	628	if (rc)
	629	goto out_driver;
e0bc2495	630	sclp_add_standby_memory();
03997904 GS	631	goto out;
	632	out_driver:
	633	platform_driver_unregister(&sclp_mem_pdrv);
e0bc2495 HC	634	out:
	635	free_page((unsigned long) sccb);
	636	return rc;
	637	}
	638	__initcall(sclp_detect_standby_memory);
	639
	640	#endif /* CONFIG_MEMORY_HOTPLUG */
	641
4b28a8fe HC	642	/*
	643	* Channel path configuration related functions.
	644	*/
	645
	646	#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
	647	#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
	648	#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
	649
	650	struct chp_cfg_sccb {
	651	struct sccb_header header;
	652	u8 ccm;
	653	u8 reserved[6];
	654	u8 cssid;
	655	} __attribute__((packed));
	656
	657	static int do_chp_configure(sclp_cmdw_t cmd)
	658	{
	659	struct chp_cfg_sccb *sccb;
	660	int rc;
	661
	662	if (!SCLP_HAS_CHP_RECONFIG)
	663	return -EOPNOTSUPP;
	664	/* Prepare sccb. */
	665	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	666	if (!sccb)
	667	return -ENOMEM;
	668	sccb->header.length = sizeof(*sccb);
	669	rc = do_sync_request(cmd, sccb);
	670	if (rc)
	671	goto out;
	672	switch (sccb->header.response_code) {
	673	case 0x0020:
	674	case 0x0120:
	675	case 0x0440:
	676	case 0x0450:
	677	break;
	678	default:
b3ff088b MS	679	pr_warning("configure channel-path failed "
	680	"(cmd=0x%08x, response=0x%04x)\n", cmd,
	681	sccb->header.response_code);
4b28a8fe HC	682	rc = -EIO;
	683	break;
	684	}
	685	out:
	686	free_page((unsigned long) sccb);
	687	return rc;
	688	}
	689
	690	/**
	691	* sclp_chp_configure - perform configure channel-path sclp command
	692	* @chpid: channel-path ID
	693	*
	694	* Perform configure channel-path command sclp command for specified chpid.
	695	* Return 0 after command successfully finished, non-zero otherwise.
	696	*/
	697	int sclp_chp_configure(struct chp_id chpid)
	698	{
	699	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH \| chpid.id << 8);
	700	}
	701
	702	/**
	703	* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
	704	* @chpid: channel-path ID
	705	*
	706	* Perform deconfigure channel-path command sclp command for specified chpid
	707	* and wait for completion. On success return 0. Return non-zero otherwise.
	708	*/
	709	int sclp_chp_deconfigure(struct chp_id chpid)
	710	{
	711	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH \| chpid.id << 8);
	712	}
	713
	714	struct chp_info_sccb {
	715	struct sccb_header header;
	716	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
	717	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
	718	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
	719	u8 ccm;
	720	u8 reserved[6];
	721	u8 cssid;
	722	} __attribute__((packed));
	723
	724	/**
	725	* sclp_chp_read_info - perform read channel-path information sclp command
	726	* @info: resulting channel-path information data
	727	*
	728	* Perform read channel-path information sclp command and wait for completion.
	729	* On success, store channel-path information in @info and return 0. Return
	730	* non-zero otherwise.
	731	*/
	732	int sclp_chp_read_info(struct sclp_chp_info *info)
	733	{
	734	struct chp_info_sccb *sccb;
	735	int rc;
	736
	737	if (!SCLP_HAS_CHP_INFO)
	738	return -EOPNOTSUPP;
	739	/* Prepare sccb. */
	740	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	741	if (!sccb)
	742	return -ENOMEM;
	743	sccb->header.length = sizeof(*sccb);
	744	rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
	745	if (rc)
746	goto out;
747	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	748	pr_warning("read channel-path info failed "
b3ff088b MS	749	"(response=0x%04x)\n", sccb->header.response_code);
4b28a8fe HC	750	rc = -EIO;
	751	goto out;
	752	}
	753	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
	754	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
	755	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
	756	out:
	757	free_page((unsigned long) sccb);
	758	return rc;
	759	}