[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 <asm/numa.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_warn("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_core_info(struct sclp_core_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;
	memcpy(&info->core, page + sccb->offset_configured,
	       info->combined * sizeof(struct sclp_core_entry));
}

int sclp_get_core_info(struct sclp_core_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_warn("readcpuinfo failed (response=0x%04x)\n",
			sccb->header.response_code);
		rc = -EIO;
		goto out;
	}
	sclp_fill_core_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_core_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_warn("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_core_configure(u8 core)
{
	return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
}

int sclp_core_deconfigure(u8 core)
{
	return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
}

#ifdef CONFIG_MEMORY_HOTPLUG

static DEFINE_MUTEX(sclp_mem_mutex);
static LIST_HEAD(sclp_mem_list);
static u8 sclp_max_storage_id;
static DECLARE_BITMAP(sclp_storage_ids, 256);
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_warn("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 alignment)
{
	unsigned long long start_align, size_align;

	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)
{
	unsigned long long start, size, addr, block_size;
	static u16 first_rn, num;

	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;
	block_size = memory_block_size_bytes();
	align_to_block_size(&start, &size, block_size);
	if (!size)
		goto skip_add;
	for (addr = start; addr < start + size; addr += block_size)
		add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_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_warn("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_warn("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>
c29a7baf	28	#include <asm/numa.h>
08d07968	29
b3ff088b	30	#include "sclp.h"
08d07968	31
08d07968 HC	32	static void sclp_sync_callback(struct sclp_req req, void data)
	33	{
	34	struct completion *completion = data;
	35
	36	complete(completion);
	37	}
	38
d475f942	39	int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
9f0128f9 GS	40	{
	41	return sclp_sync_request_timeout(cmd, sccb, 0);
	42	}
	43
	44	int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
08d07968 HC	45	{
	46	struct completion completion;
	47	struct sclp_req *request;
	48	int rc;
	49
	50	request = kzalloc(sizeof(*request), GFP_KERNEL);
	51	if (!request)
	52	return -ENOMEM;
9f0128f9 GS	53	if (timeout)
9f0128f9 GS	54	request->queue_timeout = timeout;
08d07968 HC	55	request->command = cmd;
	56	request->sccb = sccb;
	57	request->status = SCLP_REQ_FILLED;
	58	request->callback = sclp_sync_callback;
	59	request->callback_data = &completion;
	60	init_completion(&completion);
	61
	62	/* Perform sclp request. */
	63	rc = sclp_add_request(request);
	64	if (rc)
	65	goto out;
	66	wait_for_completion(&completion);
	67
	68	/* Check response. */
	69	if (request->status != SCLP_REQ_DONE) {
baebc70a JP	70	pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
baebc70a JP	71	cmd, request->status);
08d07968 HC	72	rc = -EIO;
	73	}
	74	out:
	75	kfree(request);
	76	return rc;
	77	}
	78
	79	/*
	80	* CPU configuration related functions.
	81	*/
	82
	83	#define SCLP_CMDW_READ_CPU_INFO 0x00010001
	84	#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
	85	#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
	86
	87	struct read_cpu_info_sccb {
	88	struct sccb_header header;
	89	u16 nr_configured;
	90	u16 offset_configured;
	91	u16 nr_standby;
	92	u16 offset_standby;
	93	u8 reserved[4096 - 16];
	94	} __attribute__((packed, aligned(PAGE_SIZE)));
	95
d08d9430 MS	96	static void sclp_fill_core_info(struct sclp_core_info *info,
d08d9430 MS	97	struct read_cpu_info_sccb *sccb)
08d07968 HC	98	{
	99	char page = (char ) sccb;
	100
	101	memset(info, 0, sizeof(*info));
	102	info->configured = sccb->nr_configured;
	103	info->standby = sccb->nr_standby;
	104	info->combined = sccb->nr_configured + sccb->nr_standby;
d08d9430 MS	105	memcpy(&info->core, page + sccb->offset_configured,
d08d9430 MS	106	info->combined * sizeof(struct sclp_core_entry));
08d07968 HC	107	}
08d07968 HC	108
d08d9430	109	int sclp_get_core_info(struct sclp_core_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) {
baebc70a JP	125	pr_warn("readcpuinfo failed (response=0x%04x)\n",
baebc70a JP	126	sccb->header.response_code);
08d07968 HC	127	rc = -EIO;
	128	goto out;
	129	}
d08d9430	130	sclp_fill_core_info(info, sccb);
08d07968 HC	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
d08d9430	140	static int do_core_configure(sclp_cmdw_t cmd)
08d07968 HC	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:
baebc70a JP	163	pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
baebc70a JP	164	cmd, sccb->header.response_code);
08d07968 HC	165	rc = -EIO;
	166	break;
	167	}
	168	out:
	169	kfree(sccb);
	170	return rc;
	171	}
	172
d08d9430	173	int sclp_core_configure(u8 core)
08d07968	174	{
d08d9430	175	return do_core_configure(SCLP_CMDW_CONFIGURE_CPU \| core << 8);
08d07968 HC	176	}
08d07968 HC	177
d08d9430	178	int sclp_core_deconfigure(u8 core)
08d07968	179	{
d08d9430	180	return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU \| core << 8);
08d07968	181	}
4b28a8fe	182
e0bc2495 HC	183	#ifdef CONFIG_MEMORY_HOTPLUG
	184
	185	static DEFINE_MUTEX(sclp_mem_mutex);
	186	static LIST_HEAD(sclp_mem_list);
	187	static u8 sclp_max_storage_id;
b8a43b04	188	static DECLARE_BITMAP(sclp_storage_ids, 256);
03997904	189	static int sclp_mem_state_changed;
e0bc2495 HC	190
	191	struct memory_increment {
	192	struct list_head list;
	193	u16 rn;
	194	int standby;
e0bc2495 HC	195	};
	196
	197	struct assign_storage_sccb {
	198	struct sccb_header header;
	199	u16 rn;
	200	} __packed;
	201
9c95258c HC	202	int arch_get_memory_phys_device(unsigned long start_pfn)
9c95258c HC	203	{
37c5f6c8	204	if (!sclp.rzm)
9c95258c	205	return 0;
37c5f6c8	206	return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
9c95258c HC	207	}
9c95258c HC	208
e0bc2495 HC	209	static unsigned long long rn2addr(u16 rn)
e0bc2495 HC	210	{
37c5f6c8	211	return (unsigned long long) (rn - 1) * sclp.rzm;
e0bc2495 HC	212	}
	213
	214	static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
	215	{
	216	struct assign_storage_sccb *sccb;
	217	int rc;
	218
	219	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	220	if (!sccb)
	221	return -ENOMEM;
	222	sccb->header.length = PAGE_SIZE;
	223	sccb->rn = rn;
9f0128f9	224	rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
e0bc2495 HC	225	if (rc)
	226	goto out;
	227	switch (sccb->header.response_code) {
	228	case 0x0020:
	229	case 0x0120:
	230	break;
	231	default:
baebc70a JP	232	pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
baebc70a JP	233	cmd, sccb->header.response_code, rn);
e0bc2495 HC	234	rc = -EIO;
	235	break;
	236	}
	237	out:
	238	free_page((unsigned long) sccb);
	239	return rc;
	240	}
	241
	242	static int sclp_assign_storage(u16 rn)
	243	{
6b70a920	244	unsigned long long start;
0cd2f620 HC	245	int rc;
	246
	247	rc = do_assign_storage(0x000d0001, rn);
	248	if (rc)
6b70a920 HC	249	return rc;
6b70a920 HC	250	start = rn2addr(rn);
37c5f6c8	251	storage_key_init_range(start, start + sclp.rzm);
6b70a920	252	return 0;
e0bc2495 HC	253	}
	254
	255	static int sclp_unassign_storage(u16 rn)
	256	{
	257	return do_assign_storage(0x000c0001, rn);
	258	}
	259
	260	struct attach_storage_sccb {
	261	struct sccb_header header;
	262	u16 :16;
	263	u16 assigned;
	264	u32 :32;
	265	u32 entries[0];
	266	} __packed;
	267
	268	static int sclp_attach_storage(u8 id)
	269	{
	270	struct attach_storage_sccb *sccb;
	271	int rc;
	272	int i;
	273
	274	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	275	if (!sccb)
	276	return -ENOMEM;
	277	sccb->header.length = PAGE_SIZE;
9f0128f9 GS	278	rc = sclp_sync_request_timeout(0x00080001 \| id << 8, sccb,
9f0128f9 GS	279	SCLP_QUEUE_INTERVAL);
e0bc2495 HC	280	if (rc)
	281	goto out;
	282	switch (sccb->header.response_code) {
	283	case 0x0020:
	284	set_bit(id, sclp_storage_ids);
8adb4ca3 HC	285	for (i = 0; i < sccb->assigned; i++) {
	286	if (sccb->entries[i])
	287	sclp_unassign_storage(sccb->entries[i] >> 16);
	288	}
e0bc2495 HC	289	break;
	290	default:
	291	rc = -EIO;
	292	break;
	293	}
	294	out:
	295	free_page((unsigned long) sccb);
	296	return rc;
	297	}
	298
	299	static int sclp_mem_change_state(unsigned long start, unsigned long size,
	300	int online)
	301	{
	302	struct memory_increment *incr;
	303	unsigned long long istart;
	304	int rc = 0;
	305
	306	list_for_each_entry(incr, &sclp_mem_list, list) {
	307	istart = rn2addr(incr->rn);
	308	if (start + size - 1 < istart)
	309	break;
37c5f6c8	310	if (start > istart + sclp.rzm - 1)
e0bc2495	311	continue;
15535560	312	if (online)
e0bc2495	313	rc \|= sclp_assign_storage(incr->rn);
15535560	314	else
e0bc2495	315	sclp_unassign_storage(incr->rn);
8741ce6d MH	316	if (rc == 0)
8741ce6d MH	317	incr->standby = online ? 0 : 1;
e0bc2495 HC	318	}
	319	return rc ? -EIO : 0;
	320	}
	321
8741ce6d MH	322	static bool contains_standby_increment(unsigned long start, unsigned long end)
	323	{
	324	struct memory_increment *incr;
	325	unsigned long istart;
	326
	327	list_for_each_entry(incr, &sclp_mem_list, list) {
	328	istart = rn2addr(incr->rn);
	329	if (end - 1 < istart)
	330	continue;
37c5f6c8	331	if (start > istart + sclp.rzm - 1)
8741ce6d MH	332	continue;
	333	if (incr->standby)
	334	return true;
	335	}
	336	return false;
	337	}
	338
e0bc2495 HC	339	static int sclp_mem_notifier(struct notifier_block *nb,
	340	unsigned long action, void *data)
	341	{
	342	unsigned long start, size;
	343	struct memory_notify *arg;
	344	unsigned char id;
	345	int rc = 0;
	346
	347	arg = data;
	348	start = arg->start_pfn << PAGE_SHIFT;
	349	size = arg->nr_pages << PAGE_SHIFT;
	350	mutex_lock(&sclp_mem_mutex);
fc89db4b AM	351	for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
fc89db4b AM	352	sclp_attach_storage(id);
e0bc2495	353	switch (action) {
7e9238fb	354	case MEM_GOING_OFFLINE:
8741ce6d MH	355	/*
	356	* We do not allow to set memory blocks offline that contain
	357	* standby memory. This is done to simplify the "memory online"
	358	* case.
	359	*/
	360	if (contains_standby_increment(start, start + size))
	361	rc = -EPERM;
	362	break;
	363	case MEM_ONLINE:
7e9238fb	364	case MEM_CANCEL_OFFLINE:
e0bc2495 HC	365	break;
	366	case MEM_GOING_ONLINE:
	367	rc = sclp_mem_change_state(start, size, 1);
	368	break;
	369	case MEM_CANCEL_ONLINE:
	370	sclp_mem_change_state(start, size, 0);
	371	break;
7e9238fb GS	372	case MEM_OFFLINE:
	373	sclp_mem_change_state(start, size, 0);
	374	break;
e0bc2495 HC	375	default:
	376	rc = -EINVAL;
	377	break;
	378	}
03997904 GS	379	if (!rc)
03997904 GS	380	sclp_mem_state_changed = 1;
e0bc2495 HC	381	mutex_unlock(&sclp_mem_mutex);
	382	return rc ? NOTIFY_BAD : NOTIFY_OK;
	383	}
	384
	385	static struct notifier_block sclp_mem_nb = {
	386	.notifier_call = sclp_mem_notifier,
	387	};
	388
8741ce6d	389	static void __init align_to_block_size(unsigned long long *start,
c29a7baf MH	390	unsigned long long *size,
c29a7baf MH	391	unsigned long long alignment)
8741ce6d	392	{
c29a7baf	393	unsigned long long start_align, size_align;
8741ce6d	394
8741ce6d MH	395	start_align = roundup(*start, alignment);
	396	size_align = rounddown(start + size, alignment) - start_align;
	397
	398	pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
	399	start, size_align >> 20, size >> 20);
	400	*start = start_align;
	401	*size = size_align;
	402	}
	403
e0bc2495 HC	404	static void __init add_memory_merged(u16 rn)
e0bc2495 HC	405	{
c29a7baf	406	unsigned long long start, size, addr, block_size;
e0bc2495	407	static u16 first_rn, num;
e0bc2495 HC	408
	409	if (rn && first_rn && (first_rn + num == rn)) {
	410	num++;
	411	return;
	412	}
	413	if (!first_rn)
	414	goto skip_add;
	415	start = rn2addr(first_rn);
37c5f6c8	416	size = (unsigned long long) num * sclp.rzm;
e0bc2495 HC	417	if (start >= VMEM_MAX_PHYS)
	418	goto skip_add;
	419	if (start + size > VMEM_MAX_PHYS)
	420	size = VMEM_MAX_PHYS - start;
23d75d9c HC	421	if (memory_end_set && (start >= memory_end))
	422	goto skip_add;
	423	if (memory_end_set && (start + size > memory_end))
	424	size = memory_end - start;
c29a7baf MH	425	block_size = memory_block_size_bytes();
	426	align_to_block_size(&start, &size, block_size);
	427	if (!size)
	428	goto skip_add;
	429	for (addr = start; addr < start + size; addr += block_size)
	430	add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
e0bc2495 HC	431	skip_add:
	432	first_rn = rn;
	433	num = 1;
	434	}
	435
	436	static void __init sclp_add_standby_memory(void)
	437	{
	438	struct memory_increment *incr;
	439
	440	list_for_each_entry(incr, &sclp_mem_list, list)
	441	if (incr->standby)
	442	add_memory_merged(incr->rn);
	443	add_memory_merged(0);
	444	}
	445
	446	static void __init insert_increment(u16 rn, int standby, int assigned)
	447	{
	448	struct memory_increment incr, new_incr;
	449	struct list_head *prev;
	450	u16 last_rn;
	451
	452	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	453	if (!new_incr)
	454	return;
	455	new_incr->rn = rn;
	456	new_incr->standby = standby;
	457	last_rn = 0;
	458	prev = &sclp_mem_list;
	459	list_for_each_entry(incr, &sclp_mem_list, list) {
	460	if (assigned && incr->rn > rn)
	461	break;
	462	if (!assigned && incr->rn - last_rn > 1)
	463	break;
	464	last_rn = incr->rn;
	465	prev = &incr->list;
	466	}
	467	if (!assigned)
	468	new_incr->rn = last_rn + 1;
37c5f6c8	469	if (new_incr->rn > sclp.rnmax) {
e0bc2495 HC	470	kfree(new_incr);
	471	return;
	472	}
	473	list_add(&new_incr->list, prev);
	474	}
	475
03997904 GS	476	static int sclp_mem_freeze(struct device *dev)
	477	{
	478	if (!sclp_mem_state_changed)
	479	return 0;
	480	pr_err("Memory hotplug state changed, suspend refused.\n");
	481	return -EPERM;
	482	}
	483
e0bc2495 HC	484	struct read_storage_sccb {
	485	struct sccb_header header;
	486	u16 max_id;
	487	u16 assigned;
	488	u16 standby;
	489	u16 :16;
	490	u32 entries[0];
	491	} __packed;
	492
47145210	493	static const struct dev_pm_ops sclp_mem_pm_ops = {
03997904 GS	494	.freeze = sclp_mem_freeze,
	495	};
	496
	497	static struct platform_driver sclp_mem_pdrv = {
	498	.driver = {
	499	.name = "sclp_mem",
	500	.pm = &sclp_mem_pm_ops,
	501	},
	502	};
	503
e0bc2495 HC	504	static int __init sclp_detect_standby_memory(void)
e0bc2495 HC	505	{
03997904	506	struct platform_device *sclp_pdev;
e0bc2495 HC	507	struct read_storage_sccb *sccb;
	508	int i, id, assigned, rc;
	509
52319b45 MH	510	if (OLDMEM_BASE) /* No standby memory in kdump mode */
52319b45 MH	511	return 0;
78335a30	512	if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
e0bc2495 HC	513	return 0;
	514	rc = -ENOMEM;
	515	sccb = (void *) __get_free_page(GFP_KERNEL \| GFP_DMA);
	516	if (!sccb)
	517	goto out;
	518	assigned = 0;
	519	for (id = 0; id <= sclp_max_storage_id; id++) {
	520	memset(sccb, 0, PAGE_SIZE);
	521	sccb->header.length = PAGE_SIZE;
d475f942	522	rc = sclp_sync_request(0x00040001 \| id << 8, sccb);
e0bc2495 HC	523	if (rc)
	524	goto out;
	525	switch (sccb->header.response_code) {
	526	case 0x0010:
	527	set_bit(id, sclp_storage_ids);
	528	for (i = 0; i < sccb->assigned; i++) {
	529	if (!sccb->entries[i])
	530	continue;
	531	assigned++;
	532	insert_increment(sccb->entries[i] >> 16, 0, 1);
	533	}
	534	break;
	535	case 0x0310:
	536	break;
	537	case 0x0410:
	538	for (i = 0; i < sccb->assigned; i++) {
	539	if (!sccb->entries[i])
	540	continue;
	541	assigned++;
	542	insert_increment(sccb->entries[i] >> 16, 1, 1);
	543	}
	544	break;
	545	default:
	546	rc = -EIO;
	547	break;
	548	}
	549	if (!rc)
	550	sclp_max_storage_id = sccb->max_id;
	551	}
	552	if (rc \|\| list_empty(&sclp_mem_list))
	553	goto out;
37c5f6c8	554	for (i = 1; i <= sclp.rnmax - assigned; i++)
e0bc2495 HC	555	insert_increment(0, 1, 0);
	556	rc = register_memory_notifier(&sclp_mem_nb);
	557	if (rc)
	558	goto out;
03997904 GS	559	rc = platform_driver_register(&sclp_mem_pdrv);
	560	if (rc)
	561	goto out;
	562	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
5896f8fe	563	rc = PTR_ERR_OR_ZERO(sclp_pdev);
03997904 GS	564	if (rc)
03997904 GS	565	goto out_driver;
e0bc2495	566	sclp_add_standby_memory();
03997904 GS	567	goto out;
	568	out_driver:
	569	platform_driver_unregister(&sclp_mem_pdrv);
e0bc2495 HC	570	out:
	571	free_page((unsigned long) sccb);
	572	return rc;
	573	}
	574	__initcall(sclp_detect_standby_memory);
	575
	576	#endif /* CONFIG_MEMORY_HOTPLUG */
	577
7441b062 JG	578	/*
	579	* PCI I/O adapter configuration related functions.
	580	*/
	581	#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
	582	#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
	583
	584	#define SCLP_RECONFIG_PCI_ATPYE 2
	585
	586	struct pci_cfg_sccb {
	587	struct sccb_header header;
	588	u8 atype; /* adapter type */
	589	u8 reserved1;
	590	u16 reserved2;
	591	u32 aid; /* adapter identifier */
	592	} __packed;
	593
	594	static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
	595	{
	596	struct pci_cfg_sccb *sccb;
	597	int rc;
	598
	599	if (!SCLP_HAS_PCI_RECONFIG)
	600	return -EOPNOTSUPP;
	601
	602	sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	603	if (!sccb)
	604	return -ENOMEM;
	605
	606	sccb->header.length = PAGE_SIZE;
	607	sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
	608	sccb->aid = fid;
d475f942	609	rc = sclp_sync_request(cmd, sccb);
7441b062 JG	610	if (rc)
	611	goto out;
	612	switch (sccb->header.response_code) {
	613	case 0x0020:
	614	case 0x0120:
	615	break;
	616	default:
	617	pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
	618	cmd, sccb->header.response_code);
	619	rc = -EIO;
	620	break;
	621	}
	622	out:
	623	free_page((unsigned long) sccb);
	624	return rc;
	625	}
	626
	627	int sclp_pci_configure(u32 fid)
	628	{
	629	return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
	630	}
	631	EXPORT_SYMBOL(sclp_pci_configure);
	632
	633	int sclp_pci_deconfigure(u32 fid)
	634	{
	635	return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
	636	}
	637	EXPORT_SYMBOL(sclp_pci_deconfigure);
	638
4b28a8fe HC	639	/*
	640	* Channel path configuration related functions.
	641	*/
	642
	643	#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
	644	#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
	645	#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
	646
	647	struct chp_cfg_sccb {
	648	struct sccb_header header;
	649	u8 ccm;
	650	u8 reserved[6];
	651	u8 cssid;
	652	} __attribute__((packed));
	653
	654	static int do_chp_configure(sclp_cmdw_t cmd)
	655	{
	656	struct chp_cfg_sccb *sccb;
	657	int rc;
	658
	659	if (!SCLP_HAS_CHP_RECONFIG)
	660	return -EOPNOTSUPP;
	661	/* Prepare sccb. */
	662	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	663	if (!sccb)
	664	return -ENOMEM;
	665	sccb->header.length = sizeof(*sccb);
d475f942	666	rc = sclp_sync_request(cmd, sccb);
4b28a8fe HC	667	if (rc)
	668	goto out;
	669	switch (sccb->header.response_code) {
	670	case 0x0020:
	671	case 0x0120:
	672	case 0x0440:
	673	case 0x0450:
	674	break;
	675	default:
baebc70a JP	676	pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
baebc70a JP	677	cmd, 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) {
baebc70a JP	744	pr_warn("read channel-path info failed (response=0x%04x)\n",
baebc70a JP	745	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	}