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

/*
 * Copyright IBM Corp. 2007,2012
 *
 * 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/export.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/memory.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <asm/ctl_reg.h>
#include <asm/chpid.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/sclp.h>

#include "sclp.h"

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

	complete(completion);
}

int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
{
	return sclp_sync_request_timeout(cmd, sccb, 0);
}

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

	request = kzalloc(sizeof(*request), GFP_KERNEL);
	if (!request)
		return -ENOMEM;
	if (timeout)
		request->queue_timeout = timeout;
	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.has_cpu_type;
	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 = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
				       SCLP_QUEUE_INTERVAL);
	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 = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
	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;
};

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

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

static unsigned long long rn2addr(u16 rn)
{
	return (unsigned long long) (rn - 1) * sclp.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 = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
	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)
{
	unsigned long long start;
	int rc;

	rc = do_assign_storage(0x000d0001, rn);
	if (rc)
		return rc;
	start = rn2addr(rn);
	storage_key_init_range(start, start + sclp.rzm);
	return 0;
}

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 = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
				       SCLP_QUEUE_INTERVAL);
	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 + sclp.rzm - 1)
			continue;
		if (online)
			rc |= sclp_assign_storage(incr->rn);
		else
			sclp_unassign_storage(incr->rn);
		if (rc == 0)
			incr->standby = online ? 0 : 1;
	}
	return rc ? -EIO : 0;
}

static bool contains_standby_increment(unsigned long start, unsigned long end)
{
	struct memory_increment *incr;
	unsigned long istart;

	list_for_each_entry(incr, &sclp_mem_list, list) {
		istart = rn2addr(incr->rn);
		if (end - 1 < istart)
			continue;
		if (start > istart + sclp.rzm - 1)
			continue;
		if (incr->standby)
			return true;
	}
	return false;
}

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_GOING_OFFLINE:
		/*
		 * We do not allow to set memory blocks offline that contain
		 * standby memory. This is done to simplify the "memory online"
		 * case.
		 */
		if (contains_standby_increment(start, start + size))
			rc = -EPERM;
		break;
	case MEM_ONLINE:
	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 align_to_block_size(unsigned long long *start,
				       unsigned long long *size)
{
	unsigned long long start_align, size_align, alignment;

	alignment = memory_block_size_bytes();
	start_align = roundup(*start, alignment);
	size_align = rounddown(*start + *size, alignment) - start_align;

	pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
		*start, size_align >> 20, *size >> 20);
	*start = start_align;
	*size = size_align;
}

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 * sclp.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;
	align_to_block_size(&start, &size);
	if (size)
		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 > sclp.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 (OLDMEM_BASE) /* No standby memory in kdump mode */
		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 = sclp_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 <= sclp.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 = PTR_ERR_OR_ZERO(sclp_pdev);
	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 */

/*
 * PCI I/O adapter configuration related functions.
 */
#define SCLP_CMDW_CONFIGURE_PCI			0x001a0001
#define SCLP_CMDW_DECONFIGURE_PCI		0x001b0001

#define SCLP_RECONFIG_PCI_ATPYE			2

struct pci_cfg_sccb {
	struct sccb_header header;
	u8 atype;		/* adapter type */
	u8 reserved1;
	u16 reserved2;
	u32 aid;		/* adapter identifier */
} __packed;

static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
{
	struct pci_cfg_sccb *sccb;
	int rc;

	if (!SCLP_HAS_PCI_RECONFIG)
		return -EOPNOTSUPP;

	sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sccb)
		return -ENOMEM;

	sccb->header.length = PAGE_SIZE;
	sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
	sccb->aid = fid;
	rc = sclp_sync_request(cmd, sccb);
	if (rc)
		goto out;
	switch (sccb->header.response_code) {
	case 0x0020:
	case 0x0120:
		break;
	default:
		pr_warn("configure PCI I/O adapter failed: cmd=0x%08x  response=0x%04x\n",
			cmd, sccb->header.response_code);
		rc = -EIO;
		break;
	}
out:
	free_page((unsigned long) sccb);
	return rc;
}

int sclp_pci_configure(u32 fid)
{
	return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
}
EXPORT_SYMBOL(sclp_pci_configure);

int sclp_pci_deconfigure(u32 fid)
{
	return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
}
EXPORT_SYMBOL(sclp_pci_deconfigure);

/*
 * 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 = sclp_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 = sclp_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	/*
7441b062	2	* Copyright IBM Corp. 2007,2012
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>
7441b062	15	#include <linux/export.h>
08d07968 HC	16	#include <linux/slab.h>
08d07968 HC	17	#include <linux/string.h>
e0bc2495 HC	18	#include <linux/mm.h>
	19	#include <linux/mmzone.h>
	20	#include <linux/memory.h>
1526bf9c	21	#include <linux/module.h>
03997904	22	#include <linux/platform_device.h>
6b70a920	23	#include <asm/ctl_reg.h>
4b28a8fe	24	#include <asm/chpid.h>
23d75d9c	25	#include <asm/setup.h>
6b70a920 HC	26	#include <asm/page.h>
6b70a920 HC	27	#include <asm/sclp.h>
08d07968	28
b3ff088b	29	#include "sclp.h"
08d07968	30
08d07968 HC	31	static void sclp_sync_callback(struct sclp_req req, void data)
	32	{
	33	struct completion *completion = data;
	34
	35	complete(completion);
	36	}
	37
d475f942	38	int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
9f0128f9 GS	39	{
	40	return sclp_sync_request_timeout(cmd, sccb, 0);
	41	}
	42
	43	int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
08d07968 HC	44	{
	45	struct completion completion;
	46	struct sclp_req *request;
	47	int rc;
	48
	49	request = kzalloc(sizeof(*request), GFP_KERNEL);
	50	if (!request)
	51	return -ENOMEM;
9f0128f9 GS	52	if (timeout)
9f0128f9 GS	53	request->queue_timeout = timeout;
08d07968 HC	54	request->command = cmd;
	55	request->sccb = sccb;
	56	request->status = SCLP_REQ_FILLED;
	57	request->callback = sclp_sync_callback;
	58	request->callback_data = &completion;
	59	init_completion(&completion);
	60
	61	/* Perform sclp request. */
	62	rc = sclp_add_request(request);
	63	if (rc)
	64	goto out;
	65	wait_for_completion(&completion);
	66
	67	/* Check response. */
	68	if (request->status != SCLP_REQ_DONE) {
b3ff088b MS	69	pr_warning("sync request failed (cmd=0x%08x, "
b3ff088b MS	70	"status=0x%02x)\n", cmd, request->status);
08d07968 HC	71	rc = -EIO;
	72	}
	73	out:
	74	kfree(request);
	75	return rc;
	76	}
	77
	78	/*
	79	* CPU configuration related functions.
	80	*/
	81
	82	#define SCLP_CMDW_READ_CPU_INFO 0x00010001
	83	#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
	84	#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
	85
	86	struct read_cpu_info_sccb {
	87	struct sccb_header header;
	88	u16 nr_configured;
	89	u16 offset_configured;
	90	u16 nr_standby;
	91	u16 offset_standby;
	92	u8 reserved[4096 - 16];
	93	} __attribute__((packed, aligned(PAGE_SIZE)));
	94
08d07968 HC	95	static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
	96	struct read_cpu_info_sccb *sccb)
	97	{
	98	char page = (char ) sccb;
	99
	100	memset(info, 0, sizeof(*info));
	101	info->configured = sccb->nr_configured;
	102	info->standby = sccb->nr_standby;
	103	info->combined = sccb->nr_configured + sccb->nr_standby;
37c5f6c8	104	info->has_cpu_type = sclp.has_cpu_type;
08d07968 HC	105	memcpy(&info->cpu, page + sccb->offset_configured,
	106	info->combined * sizeof(struct sclp_cpu_entry));
	107	}
	108
48483b32	109	int sclp_get_cpu_info(struct sclp_cpu_info *info)
08d07968 HC	110	{
	111	int rc;
	112	struct read_cpu_info_sccb *sccb;
	113
	114	if (!SCLP_HAS_CPU_INFO)
	115	return -EOPNOTSUPP;
48483b32	116	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
08d07968 HC	117	if (!sccb)
08d07968 HC	118	return -ENOMEM;
08d07968	119	sccb->header.length = sizeof(*sccb);
9f0128f9 GS	120	rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
9f0128f9 GS	121	SCLP_QUEUE_INTERVAL);
08d07968 HC	122	if (rc)
	123	goto out;
	124	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	125	pr_warning("readcpuinfo failed (response=0x%04x)\n",
b3ff088b MS	126	sccb->header.response_code);
08d07968 HC	127	rc = -EIO;
	128	goto out;
	129	}
	130	sclp_fill_cpu_info(info, sccb);
	131	out:
	132	free_page((unsigned long) sccb);
	133	return rc;
	134	}
	135
08d07968 HC	136	struct cpu_configure_sccb {
	137	struct sccb_header header;
	138	} __attribute__((packed, aligned(8)));
	139
	140	static int do_cpu_configure(sclp_cmdw_t cmd)
	141	{
	142	struct cpu_configure_sccb *sccb;
	143	int rc;
	144
	145	if (!SCLP_HAS_CPU_RECONFIG)
	146	return -EOPNOTSUPP;
	147	/*
	148	* This is not going to cross a page boundary since we force
	149	* kmalloc to have a minimum alignment of 8 bytes on s390.
	150	*/
	151	sccb = kzalloc(sizeof(*sccb), GFP_KERNEL \| GFP_DMA);
	152	if (!sccb)
	153	return -ENOMEM;
	154	sccb->header.length = sizeof(*sccb);
9f0128f9	155	rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
08d07968 HC	156	if (rc)
	157	goto out;
	158	switch (sccb->header.response_code) {
	159	case 0x0020:
	160	case 0x0120:
	161	break;
	162	default:
b3ff088b MS	163	pr_warning("configure cpu failed (cmd=0x%08x, "
	164	"response=0x%04x)\n", cmd,
	165	sccb->header.response_code);
08d07968 HC	166	rc = -EIO;
	167	break;
	168	}
	169	out:
	170	kfree(sccb);
	171	return rc;
	172	}
	173
	174	int sclp_cpu_configure(u8 cpu)
	175	{
	176	return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU \| cpu << 8);
	177	}
	178
	179	int sclp_cpu_deconfigure(u8 cpu)
	180	{
	181	return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU \| cpu << 8);
	182	}
4b28a8fe	183
e0bc2495 HC	184	#ifdef CONFIG_MEMORY_HOTPLUG
	185
	186	static DEFINE_MUTEX(sclp_mem_mutex);
	187	static LIST_HEAD(sclp_mem_list);
	188	static u8 sclp_max_storage_id;
	189	static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
03997904	190	static int sclp_mem_state_changed;
e0bc2495 HC	191
	192	struct memory_increment {
	193	struct list_head list;
	194	u16 rn;
	195	int standby;
e0bc2495 HC	196	};
	197
	198	struct assign_storage_sccb {
	199	struct sccb_header header;
	200	u16 rn;
	201	} __packed;
	202
9c95258c HC	203	int arch_get_memory_phys_device(unsigned long start_pfn)
9c95258c HC	204	{
37c5f6c8	205	if (!sclp.rzm)
9c95258c	206	return 0;
37c5f6c8	207	return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
9c95258c HC	208	}
9c95258c HC	209
e0bc2495 HC	210	static unsigned long long rn2addr(u16 rn)
e0bc2495 HC	211	{
37c5f6c8	212	return (unsigned long long) (rn - 1) * sclp.rzm;
e0bc2495 HC	213	}
	214
	215	static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
	216	{
	217	struct assign_storage_sccb *sccb;
	218	int rc;
	219
	220	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	221	if (!sccb)
	222	return -ENOMEM;
	223	sccb->header.length = PAGE_SIZE;
	224	sccb->rn = rn;
9f0128f9	225	rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
e0bc2495 HC	226	if (rc)
	227	goto out;
	228	switch (sccb->header.response_code) {
	229	case 0x0020:
	230	case 0x0120:
	231	break;
	232	default:
675be97a HC	233	pr_warning("assign storage failed (cmd=0x%08x, "
	234	"response=0x%04x, rn=0x%04x)\n", cmd,
	235	sccb->header.response_code, rn);
e0bc2495 HC	236	rc = -EIO;
	237	break;
	238	}
	239	out:
	240	free_page((unsigned long) sccb);
	241	return rc;
	242	}
	243
	244	static int sclp_assign_storage(u16 rn)
	245	{
6b70a920	246	unsigned long long start;
0cd2f620 HC	247	int rc;
	248
	249	rc = do_assign_storage(0x000d0001, rn);
	250	if (rc)
6b70a920 HC	251	return rc;
6b70a920 HC	252	start = rn2addr(rn);
37c5f6c8	253	storage_key_init_range(start, start + sclp.rzm);
6b70a920	254	return 0;
e0bc2495 HC	255	}
	256
	257	static int sclp_unassign_storage(u16 rn)
	258	{
	259	return do_assign_storage(0x000c0001, rn);
	260	}
	261
	262	struct attach_storage_sccb {
	263	struct sccb_header header;
	264	u16 :16;
	265	u16 assigned;
	266	u32 :32;
	267	u32 entries[0];
	268	} __packed;
	269
	270	static int sclp_attach_storage(u8 id)
	271	{
	272	struct attach_storage_sccb *sccb;
	273	int rc;
	274	int i;
	275
	276	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	277	if (!sccb)
	278	return -ENOMEM;
	279	sccb->header.length = PAGE_SIZE;
9f0128f9 GS	280	rc = sclp_sync_request_timeout(0x00080001 \| id << 8, sccb,
9f0128f9 GS	281	SCLP_QUEUE_INTERVAL);
e0bc2495 HC	282	if (rc)
	283	goto out;
	284	switch (sccb->header.response_code) {
	285	case 0x0020:
	286	set_bit(id, sclp_storage_ids);
8adb4ca3 HC	287	for (i = 0; i < sccb->assigned; i++) {
	288	if (sccb->entries[i])
	289	sclp_unassign_storage(sccb->entries[i] >> 16);
	290	}
e0bc2495 HC	291	break;
	292	default:
	293	rc = -EIO;
	294	break;
	295	}
	296	out:
	297	free_page((unsigned long) sccb);
	298	return rc;
	299	}
	300
	301	static int sclp_mem_change_state(unsigned long start, unsigned long size,
	302	int online)
	303	{
	304	struct memory_increment *incr;
	305	unsigned long long istart;
	306	int rc = 0;
	307
	308	list_for_each_entry(incr, &sclp_mem_list, list) {
	309	istart = rn2addr(incr->rn);
	310	if (start + size - 1 < istart)
	311	break;
37c5f6c8	312	if (start > istart + sclp.rzm - 1)
e0bc2495	313	continue;
15535560	314	if (online)
e0bc2495	315	rc \|= sclp_assign_storage(incr->rn);
15535560	316	else
e0bc2495	317	sclp_unassign_storage(incr->rn);
8741ce6d MH	318	if (rc == 0)
8741ce6d MH	319	incr->standby = online ? 0 : 1;
e0bc2495 HC	320	}
	321	return rc ? -EIO : 0;
	322	}
	323
8741ce6d MH	324	static bool contains_standby_increment(unsigned long start, unsigned long end)
	325	{
	326	struct memory_increment *incr;
	327	unsigned long istart;
	328
	329	list_for_each_entry(incr, &sclp_mem_list, list) {
	330	istart = rn2addr(incr->rn);
	331	if (end - 1 < istart)
	332	continue;
37c5f6c8	333	if (start > istart + sclp.rzm - 1)
8741ce6d MH	334	continue;
	335	if (incr->standby)
	336	return true;
	337	}
	338	return false;
	339	}
	340
e0bc2495 HC	341	static int sclp_mem_notifier(struct notifier_block *nb,
	342	unsigned long action, void *data)
	343	{
	344	unsigned long start, size;
	345	struct memory_notify *arg;
	346	unsigned char id;
	347	int rc = 0;
	348
	349	arg = data;
	350	start = arg->start_pfn << PAGE_SHIFT;
	351	size = arg->nr_pages << PAGE_SHIFT;
	352	mutex_lock(&sclp_mem_mutex);
fc89db4b AM	353	for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
fc89db4b AM	354	sclp_attach_storage(id);
e0bc2495	355	switch (action) {
7e9238fb	356	case MEM_GOING_OFFLINE:
8741ce6d MH	357	/*
	358	* We do not allow to set memory blocks offline that contain
	359	* standby memory. This is done to simplify the "memory online"
	360	* case.
	361	*/
	362	if (contains_standby_increment(start, start + size))
	363	rc = -EPERM;
	364	break;
	365	case MEM_ONLINE:
7e9238fb	366	case MEM_CANCEL_OFFLINE:
e0bc2495 HC	367	break;
	368	case MEM_GOING_ONLINE:
	369	rc = sclp_mem_change_state(start, size, 1);
	370	break;
	371	case MEM_CANCEL_ONLINE:
	372	sclp_mem_change_state(start, size, 0);
	373	break;
7e9238fb GS	374	case MEM_OFFLINE:
	375	sclp_mem_change_state(start, size, 0);
	376	break;
e0bc2495 HC	377	default:
	378	rc = -EINVAL;
	379	break;
	380	}
03997904 GS	381	if (!rc)
03997904 GS	382	sclp_mem_state_changed = 1;
e0bc2495 HC	383	mutex_unlock(&sclp_mem_mutex);
	384	return rc ? NOTIFY_BAD : NOTIFY_OK;
	385	}
	386
	387	static struct notifier_block sclp_mem_nb = {
	388	.notifier_call = sclp_mem_notifier,
	389	};
	390
8741ce6d MH	391	static void __init align_to_block_size(unsigned long long *start,
	392	unsigned long long *size)
	393	{
	394	unsigned long long start_align, size_align, alignment;
	395
	396	alignment = memory_block_size_bytes();
	397	start_align = roundup(*start, alignment);
	398	size_align = rounddown(start + size, alignment) - start_align;
	399
	400	pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
	401	start, size_align >> 20, size >> 20);
	402	*start = start_align;
	403	*size = size_align;
	404	}
	405
e0bc2495 HC	406	static void __init add_memory_merged(u16 rn)
	407	{
	408	static u16 first_rn, num;
	409	unsigned long long start, size;
	410
	411	if (rn && first_rn && (first_rn + num == rn)) {
	412	num++;
	413	return;
	414	}
	415	if (!first_rn)
	416	goto skip_add;
	417	start = rn2addr(first_rn);
37c5f6c8	418	size = (unsigned long long) num * sclp.rzm;
e0bc2495 HC	419	if (start >= VMEM_MAX_PHYS)
	420	goto skip_add;
	421	if (start + size > VMEM_MAX_PHYS)
	422	size = VMEM_MAX_PHYS - start;
23d75d9c HC	423	if (memory_end_set && (start >= memory_end))
	424	goto skip_add;
	425	if (memory_end_set && (start + size > memory_end))
	426	size = memory_end - start;
8741ce6d MH	427	align_to_block_size(&start, &size);
	428	if (size)
	429	add_memory(0, start, size);
e0bc2495 HC	430	skip_add:
	431	first_rn = rn;
	432	num = 1;
	433	}
	434
	435	static void __init sclp_add_standby_memory(void)
	436	{
	437	struct memory_increment *incr;
	438
	439	list_for_each_entry(incr, &sclp_mem_list, list)
	440	if (incr->standby)
	441	add_memory_merged(incr->rn);
	442	add_memory_merged(0);
	443	}
	444
	445	static void __init insert_increment(u16 rn, int standby, int assigned)
	446	{
	447	struct memory_increment incr, new_incr;
	448	struct list_head *prev;
	449	u16 last_rn;
	450
	451	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	452	if (!new_incr)
	453	return;
	454	new_incr->rn = rn;
	455	new_incr->standby = standby;
	456	last_rn = 0;
	457	prev = &sclp_mem_list;
	458	list_for_each_entry(incr, &sclp_mem_list, list) {
	459	if (assigned && incr->rn > rn)
	460	break;
	461	if (!assigned && incr->rn - last_rn > 1)
	462	break;
	463	last_rn = incr->rn;
	464	prev = &incr->list;
	465	}
	466	if (!assigned)
	467	new_incr->rn = last_rn + 1;
37c5f6c8	468	if (new_incr->rn > sclp.rnmax) {
e0bc2495 HC	469	kfree(new_incr);
	470	return;
	471	}
	472	list_add(&new_incr->list, prev);
	473	}
	474
03997904 GS	475	static int sclp_mem_freeze(struct device *dev)
	476	{
	477	if (!sclp_mem_state_changed)
	478	return 0;
	479	pr_err("Memory hotplug state changed, suspend refused.\n");
	480	return -EPERM;
	481	}
	482
e0bc2495 HC	483	struct read_storage_sccb {
	484	struct sccb_header header;
	485	u16 max_id;
	486	u16 assigned;
	487	u16 standby;
	488	u16 :16;
	489	u32 entries[0];
	490	} __packed;
	491
47145210	492	static const struct dev_pm_ops sclp_mem_pm_ops = {
03997904 GS	493	.freeze = sclp_mem_freeze,
	494	};
	495
	496	static struct platform_driver sclp_mem_pdrv = {
	497	.driver = {
	498	.name = "sclp_mem",
	499	.pm = &sclp_mem_pm_ops,
	500	},
	501	};
	502
e0bc2495 HC	503	static int __init sclp_detect_standby_memory(void)
e0bc2495 HC	504	{
03997904	505	struct platform_device *sclp_pdev;
e0bc2495 HC	506	struct read_storage_sccb *sccb;
	507	int i, id, assigned, rc;
	508
52319b45 MH	509	if (OLDMEM_BASE) /* No standby memory in kdump mode */
52319b45 MH	510	return 0;
e0bc2495 HC	511	if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
	512	return 0;
	513	rc = -ENOMEM;
	514	sccb = (void *) __get_free_page(GFP_KERNEL \| GFP_DMA);
	515	if (!sccb)
	516	goto out;
	517	assigned = 0;
	518	for (id = 0; id <= sclp_max_storage_id; id++) {
	519	memset(sccb, 0, PAGE_SIZE);
	520	sccb->header.length = PAGE_SIZE;
d475f942	521	rc = sclp_sync_request(0x00040001 \| id << 8, sccb);
e0bc2495 HC	522	if (rc)
	523	goto out;
	524	switch (sccb->header.response_code) {
	525	case 0x0010:
	526	set_bit(id, sclp_storage_ids);
	527	for (i = 0; i < sccb->assigned; i++) {
	528	if (!sccb->entries[i])
	529	continue;
	530	assigned++;
	531	insert_increment(sccb->entries[i] >> 16, 0, 1);
	532	}
	533	break;
	534	case 0x0310:
	535	break;
	536	case 0x0410:
	537	for (i = 0; i < sccb->assigned; i++) {
	538	if (!sccb->entries[i])
	539	continue;
	540	assigned++;
	541	insert_increment(sccb->entries[i] >> 16, 1, 1);
	542	}
	543	break;
	544	default:
	545	rc = -EIO;
	546	break;
	547	}
	548	if (!rc)
	549	sclp_max_storage_id = sccb->max_id;
	550	}
	551	if (rc \|\| list_empty(&sclp_mem_list))
	552	goto out;
37c5f6c8	553	for (i = 1; i <= sclp.rnmax - assigned; i++)
e0bc2495 HC	554	insert_increment(0, 1, 0);
	555	rc = register_memory_notifier(&sclp_mem_nb);
	556	if (rc)
	557	goto out;
03997904 GS	558	rc = platform_driver_register(&sclp_mem_pdrv);
	559	if (rc)
	560	goto out;
	561	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
5896f8fe	562	rc = PTR_ERR_OR_ZERO(sclp_pdev);
03997904 GS	563	if (rc)
03997904 GS	564	goto out_driver;
e0bc2495	565	sclp_add_standby_memory();
03997904 GS	566	goto out;
	567	out_driver:
	568	platform_driver_unregister(&sclp_mem_pdrv);
e0bc2495 HC	569	out:
	570	free_page((unsigned long) sccb);
	571	return rc;
	572	}
	573	__initcall(sclp_detect_standby_memory);
	574
	575	#endif /* CONFIG_MEMORY_HOTPLUG */
	576
7441b062 JG	577	/*
	578	* PCI I/O adapter configuration related functions.
	579	*/
	580	#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
	581	#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
	582
	583	#define SCLP_RECONFIG_PCI_ATPYE 2
	584
	585	struct pci_cfg_sccb {
	586	struct sccb_header header;
	587	u8 atype; /* adapter type */
	588	u8 reserved1;
	589	u16 reserved2;
	590	u32 aid; /* adapter identifier */
	591	} __packed;
	592
	593	static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
	594	{
	595	struct pci_cfg_sccb *sccb;
	596	int rc;
	597
	598	if (!SCLP_HAS_PCI_RECONFIG)
	599	return -EOPNOTSUPP;
	600
	601	sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	602	if (!sccb)
	603	return -ENOMEM;
	604
	605	sccb->header.length = PAGE_SIZE;
	606	sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
	607	sccb->aid = fid;
d475f942	608	rc = sclp_sync_request(cmd, sccb);
7441b062 JG	609	if (rc)
	610	goto out;
	611	switch (sccb->header.response_code) {
	612	case 0x0020:
	613	case 0x0120:
	614	break;
	615	default:
	616	pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
	617	cmd, sccb->header.response_code);
	618	rc = -EIO;
	619	break;
	620	}
	621	out:
	622	free_page((unsigned long) sccb);
	623	return rc;
	624	}
	625
	626	int sclp_pci_configure(u32 fid)
	627	{
	628	return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
	629	}
	630	EXPORT_SYMBOL(sclp_pci_configure);
	631
	632	int sclp_pci_deconfigure(u32 fid)
	633	{
	634	return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
	635	}
	636	EXPORT_SYMBOL(sclp_pci_deconfigure);
	637
4b28a8fe HC	638	/*
	639	* Channel path configuration related functions.
	640	*/
	641
	642	#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
	643	#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
	644	#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
	645
	646	struct chp_cfg_sccb {
	647	struct sccb_header header;
	648	u8 ccm;
	649	u8 reserved[6];
	650	u8 cssid;
	651	} __attribute__((packed));
	652
	653	static int do_chp_configure(sclp_cmdw_t cmd)
	654	{
	655	struct chp_cfg_sccb *sccb;
	656	int rc;
	657
	658	if (!SCLP_HAS_CHP_RECONFIG)
	659	return -EOPNOTSUPP;
	660	/* Prepare sccb. */
	661	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	662	if (!sccb)
	663	return -ENOMEM;
	664	sccb->header.length = sizeof(*sccb);
d475f942	665	rc = sclp_sync_request(cmd, sccb);
4b28a8fe HC	666	if (rc)
	667	goto out;
	668	switch (sccb->header.response_code) {
	669	case 0x0020:
	670	case 0x0120:
	671	case 0x0440:
	672	case 0x0450:
	673	break;
	674	default:
b3ff088b MS	675	pr_warning("configure channel-path failed "
	676	"(cmd=0x%08x, response=0x%04x)\n", cmd,
	677	sccb->header.response_code);
4b28a8fe HC	678	rc = -EIO;
	679	break;
	680	}
	681	out:
	682	free_page((unsigned long) sccb);
	683	return rc;
	684	}
	685
	686	/**
	687	* sclp_chp_configure - perform configure channel-path sclp command
	688	* @chpid: channel-path ID
	689	*
	690	* Perform configure channel-path command sclp command for specified chpid.
	691	* Return 0 after command successfully finished, non-zero otherwise.
	692	*/
	693	int sclp_chp_configure(struct chp_id chpid)
	694	{
	695	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH \| chpid.id << 8);
	696	}
	697
	698	/**
	699	* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
	700	* @chpid: channel-path ID
	701	*
	702	* Perform deconfigure channel-path command sclp command for specified chpid
	703	* and wait for completion. On success return 0. Return non-zero otherwise.
	704	*/
	705	int sclp_chp_deconfigure(struct chp_id chpid)
	706	{
	707	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH \| chpid.id << 8);
	708	}
	709
	710	struct chp_info_sccb {
	711	struct sccb_header header;
	712	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
	713	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
	714	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
	715	u8 ccm;
	716	u8 reserved[6];
	717	u8 cssid;
	718	} __attribute__((packed));
	719
	720	/**
	721	* sclp_chp_read_info - perform read channel-path information sclp command
	722	* @info: resulting channel-path information data
	723	*
	724	* Perform read channel-path information sclp command and wait for completion.
	725	* On success, store channel-path information in @info and return 0. Return
	726	* non-zero otherwise.
	727	*/
	728	int sclp_chp_read_info(struct sclp_chp_info *info)
	729	{
	730	struct chp_info_sccb *sccb;
	731	int rc;
	732
	733	if (!SCLP_HAS_CHP_INFO)
	734	return -EOPNOTSUPP;
	735	/* Prepare sccb. */
	736	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	737	if (!sccb)
	738	return -ENOMEM;
	739	sccb->header.length = sizeof(*sccb);
d475f942	740	rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
4b28a8fe HC	741	if (rc)
	742	goto out;
	743	if (sccb->header.response_code != 0x0010) {
b3ff088b MS	744	pr_warning("read channel-path info failed "
b3ff088b MS	745	"(response=0x%04x)\n", sccb->header.response_code);
4b28a8fe HC	746	rc = -EIO;
	747	goto out;
	748	}
	749	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
	750	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
	751	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
	752	out:
	753	free_page((unsigned long) sccb);
	754	return rc;
	755	}