[mirror_ubuntu-bionic-kernel.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_CONFIGURE_CPU		0x00110001
#define SCLP_CMDW_DECONFIGURE_CPU	0x00100001

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 */

/*
 * 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
08d07968 HC	83	#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
	84	#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
	85
af51160e	86	int _sclp_get_core_info(struct sclp_core_info *info)
08d07968 HC	87	{
	88	int rc;
	89	struct read_cpu_info_sccb *sccb;
	90
	91	if (!SCLP_HAS_CPU_INFO)
	92	return -EOPNOTSUPP;
48483b32	93	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
08d07968 HC	94	if (!sccb)
08d07968 HC	95	return -ENOMEM;
08d07968	96	sccb->header.length = sizeof(*sccb);
9f0128f9 GS	97	rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
9f0128f9 GS	98	SCLP_QUEUE_INTERVAL);
08d07968 HC	99	if (rc)
	100	goto out;
	101	if (sccb->header.response_code != 0x0010) {
baebc70a JP	102	pr_warn("readcpuinfo failed (response=0x%04x)\n",
baebc70a JP	103	sccb->header.response_code);
08d07968 HC	104	rc = -EIO;
	105	goto out;
	106	}
d08d9430	107	sclp_fill_core_info(info, sccb);
08d07968 HC	108	out:
	109	free_page((unsigned long) sccb);
	110	return rc;
	111	}
	112
08d07968 HC	113	struct cpu_configure_sccb {
	114	struct sccb_header header;
	115	} __attribute__((packed, aligned(8)));
	116
d08d9430	117	static int do_core_configure(sclp_cmdw_t cmd)
08d07968 HC	118	{
	119	struct cpu_configure_sccb *sccb;
	120	int rc;
	121
	122	if (!SCLP_HAS_CPU_RECONFIG)
	123	return -EOPNOTSUPP;
	124	/*
	125	* This is not going to cross a page boundary since we force
	126	* kmalloc to have a minimum alignment of 8 bytes on s390.
	127	*/
	128	sccb = kzalloc(sizeof(*sccb), GFP_KERNEL \| GFP_DMA);
	129	if (!sccb)
	130	return -ENOMEM;
	131	sccb->header.length = sizeof(*sccb);
9f0128f9	132	rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
08d07968 HC	133	if (rc)
	134	goto out;
	135	switch (sccb->header.response_code) {
	136	case 0x0020:
	137	case 0x0120:
	138	break;
	139	default:
baebc70a JP	140	pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
baebc70a JP	141	cmd, sccb->header.response_code);
08d07968 HC	142	rc = -EIO;
	143	break;
	144	}
	145	out:
	146	kfree(sccb);
	147	return rc;
	148	}
	149
d08d9430	150	int sclp_core_configure(u8 core)
08d07968	151	{
d08d9430	152	return do_core_configure(SCLP_CMDW_CONFIGURE_CPU \| core << 8);
08d07968 HC	153	}
08d07968 HC	154
d08d9430	155	int sclp_core_deconfigure(u8 core)
08d07968	156	{
d08d9430	157	return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU \| core << 8);
08d07968	158	}
4b28a8fe	159
e0bc2495 HC	160	#ifdef CONFIG_MEMORY_HOTPLUG
	161
	162	static DEFINE_MUTEX(sclp_mem_mutex);
	163	static LIST_HEAD(sclp_mem_list);
	164	static u8 sclp_max_storage_id;
b8a43b04	165	static DECLARE_BITMAP(sclp_storage_ids, 256);
03997904	166	static int sclp_mem_state_changed;
e0bc2495 HC	167
	168	struct memory_increment {
	169	struct list_head list;
	170	u16 rn;
	171	int standby;
e0bc2495 HC	172	};
	173
	174	struct assign_storage_sccb {
	175	struct sccb_header header;
	176	u16 rn;
	177	} __packed;
	178
9c95258c HC	179	int arch_get_memory_phys_device(unsigned long start_pfn)
9c95258c HC	180	{
37c5f6c8	181	if (!sclp.rzm)
9c95258c	182	return 0;
37c5f6c8	183	return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
9c95258c HC	184	}
9c95258c HC	185
e0bc2495 HC	186	static unsigned long long rn2addr(u16 rn)
e0bc2495 HC	187	{
37c5f6c8	188	return (unsigned long long) (rn - 1) * sclp.rzm;
e0bc2495 HC	189	}
	190
	191	static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
	192	{
	193	struct assign_storage_sccb *sccb;
	194	int rc;
	195
	196	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	197	if (!sccb)
	198	return -ENOMEM;
	199	sccb->header.length = PAGE_SIZE;
	200	sccb->rn = rn;
9f0128f9	201	rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
e0bc2495 HC	202	if (rc)
	203	goto out;
	204	switch (sccb->header.response_code) {
	205	case 0x0020:
	206	case 0x0120:
	207	break;
	208	default:
baebc70a JP	209	pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
baebc70a JP	210	cmd, sccb->header.response_code, rn);
e0bc2495 HC	211	rc = -EIO;
	212	break;
	213	}
	214	out:
	215	free_page((unsigned long) sccb);
	216	return rc;
	217	}
	218
	219	static int sclp_assign_storage(u16 rn)
	220	{
6b70a920	221	unsigned long long start;
0cd2f620 HC	222	int rc;
	223
	224	rc = do_assign_storage(0x000d0001, rn);
	225	if (rc)
6b70a920 HC	226	return rc;
6b70a920 HC	227	start = rn2addr(rn);
37c5f6c8	228	storage_key_init_range(start, start + sclp.rzm);
6b70a920	229	return 0;
e0bc2495 HC	230	}
	231
	232	static int sclp_unassign_storage(u16 rn)
	233	{
	234	return do_assign_storage(0x000c0001, rn);
	235	}
	236
	237	struct attach_storage_sccb {
	238	struct sccb_header header;
	239	u16 :16;
	240	u16 assigned;
	241	u32 :32;
	242	u32 entries[0];
	243	} __packed;
	244
	245	static int sclp_attach_storage(u8 id)
	246	{
	247	struct attach_storage_sccb *sccb;
	248	int rc;
	249	int i;
	250
	251	sccb = (void *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	252	if (!sccb)
	253	return -ENOMEM;
	254	sccb->header.length = PAGE_SIZE;
9f0128f9 GS	255	rc = sclp_sync_request_timeout(0x00080001 \| id << 8, sccb,
9f0128f9 GS	256	SCLP_QUEUE_INTERVAL);
e0bc2495 HC	257	if (rc)
	258	goto out;
	259	switch (sccb->header.response_code) {
	260	case 0x0020:
	261	set_bit(id, sclp_storage_ids);
8adb4ca3 HC	262	for (i = 0; i < sccb->assigned; i++) {
	263	if (sccb->entries[i])
	264	sclp_unassign_storage(sccb->entries[i] >> 16);
	265	}
e0bc2495 HC	266	break;
	267	default:
	268	rc = -EIO;
	269	break;
	270	}
	271	out:
	272	free_page((unsigned long) sccb);
	273	return rc;
	274	}
	275
	276	static int sclp_mem_change_state(unsigned long start, unsigned long size,
	277	int online)
	278	{
	279	struct memory_increment *incr;
	280	unsigned long long istart;
	281	int rc = 0;
	282
	283	list_for_each_entry(incr, &sclp_mem_list, list) {
	284	istart = rn2addr(incr->rn);
	285	if (start + size - 1 < istart)
	286	break;
37c5f6c8	287	if (start > istart + sclp.rzm - 1)
e0bc2495	288	continue;
15535560	289	if (online)
e0bc2495	290	rc \|= sclp_assign_storage(incr->rn);
15535560	291	else
e0bc2495	292	sclp_unassign_storage(incr->rn);
8741ce6d MH	293	if (rc == 0)
8741ce6d MH	294	incr->standby = online ? 0 : 1;
e0bc2495 HC	295	}
	296	return rc ? -EIO : 0;
	297	}
	298
8741ce6d MH	299	static bool contains_standby_increment(unsigned long start, unsigned long end)
	300	{
	301	struct memory_increment *incr;
	302	unsigned long istart;
	303
	304	list_for_each_entry(incr, &sclp_mem_list, list) {
	305	istart = rn2addr(incr->rn);
	306	if (end - 1 < istart)
	307	continue;
37c5f6c8	308	if (start > istart + sclp.rzm - 1)
8741ce6d MH	309	continue;
	310	if (incr->standby)
	311	return true;
	312	}
	313	return false;
	314	}
	315
e0bc2495 HC	316	static int sclp_mem_notifier(struct notifier_block *nb,
	317	unsigned long action, void *data)
	318	{
	319	unsigned long start, size;
	320	struct memory_notify *arg;
	321	unsigned char id;
	322	int rc = 0;
	323
	324	arg = data;
	325	start = arg->start_pfn << PAGE_SHIFT;
	326	size = arg->nr_pages << PAGE_SHIFT;
	327	mutex_lock(&sclp_mem_mutex);
fc89db4b AM	328	for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
fc89db4b AM	329	sclp_attach_storage(id);
e0bc2495	330	switch (action) {
7e9238fb	331	case MEM_GOING_OFFLINE:
8741ce6d MH	332	/*
	333	* We do not allow to set memory blocks offline that contain
	334	* standby memory. This is done to simplify the "memory online"
	335	* case.
	336	*/
	337	if (contains_standby_increment(start, start + size))
	338	rc = -EPERM;
	339	break;
	340	case MEM_ONLINE:
7e9238fb	341	case MEM_CANCEL_OFFLINE:
e0bc2495 HC	342	break;
	343	case MEM_GOING_ONLINE:
	344	rc = sclp_mem_change_state(start, size, 1);
	345	break;
	346	case MEM_CANCEL_ONLINE:
	347	sclp_mem_change_state(start, size, 0);
	348	break;
7e9238fb GS	349	case MEM_OFFLINE:
	350	sclp_mem_change_state(start, size, 0);
	351	break;
e0bc2495 HC	352	default:
	353	rc = -EINVAL;
	354	break;
	355	}
03997904 GS	356	if (!rc)
03997904 GS	357	sclp_mem_state_changed = 1;
e0bc2495 HC	358	mutex_unlock(&sclp_mem_mutex);
	359	return rc ? NOTIFY_BAD : NOTIFY_OK;
	360	}
	361
	362	static struct notifier_block sclp_mem_nb = {
	363	.notifier_call = sclp_mem_notifier,
	364	};
	365
8741ce6d	366	static void __init align_to_block_size(unsigned long long *start,
c29a7baf MH	367	unsigned long long *size,
c29a7baf MH	368	unsigned long long alignment)
8741ce6d	369	{
c29a7baf	370	unsigned long long start_align, size_align;
8741ce6d	371
8741ce6d MH	372	start_align = roundup(*start, alignment);
	373	size_align = rounddown(start + size, alignment) - start_align;
	374
	375	pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
	376	start, size_align >> 20, size >> 20);
	377	*start = start_align;
	378	*size = size_align;
	379	}
	380
e0bc2495 HC	381	static void __init add_memory_merged(u16 rn)
e0bc2495 HC	382	{
c29a7baf	383	unsigned long long start, size, addr, block_size;
e0bc2495	384	static u16 first_rn, num;
e0bc2495 HC	385
	386	if (rn && first_rn && (first_rn + num == rn)) {
	387	num++;
	388	return;
	389	}
	390	if (!first_rn)
	391	goto skip_add;
	392	start = rn2addr(first_rn);
37c5f6c8	393	size = (unsigned long long) num * sclp.rzm;
e0bc2495 HC	394	if (start >= VMEM_MAX_PHYS)
	395	goto skip_add;
	396	if (start + size > VMEM_MAX_PHYS)
	397	size = VMEM_MAX_PHYS - start;
23d75d9c HC	398	if (memory_end_set && (start >= memory_end))
	399	goto skip_add;
	400	if (memory_end_set && (start + size > memory_end))
	401	size = memory_end - start;
c29a7baf MH	402	block_size = memory_block_size_bytes();
	403	align_to_block_size(&start, &size, block_size);
	404	if (!size)
	405	goto skip_add;
	406	for (addr = start; addr < start + size; addr += block_size)
	407	add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
e0bc2495 HC	408	skip_add:
	409	first_rn = rn;
	410	num = 1;
	411	}
	412
	413	static void __init sclp_add_standby_memory(void)
	414	{
	415	struct memory_increment *incr;
	416
	417	list_for_each_entry(incr, &sclp_mem_list, list)
	418	if (incr->standby)
	419	add_memory_merged(incr->rn);
	420	add_memory_merged(0);
	421	}
	422
	423	static void __init insert_increment(u16 rn, int standby, int assigned)
	424	{
	425	struct memory_increment incr, new_incr;
	426	struct list_head *prev;
	427	u16 last_rn;
	428
	429	new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
	430	if (!new_incr)
	431	return;
	432	new_incr->rn = rn;
	433	new_incr->standby = standby;
	434	last_rn = 0;
	435	prev = &sclp_mem_list;
	436	list_for_each_entry(incr, &sclp_mem_list, list) {
	437	if (assigned && incr->rn > rn)
	438	break;
	439	if (!assigned && incr->rn - last_rn > 1)
	440	break;
	441	last_rn = incr->rn;
	442	prev = &incr->list;
	443	}
	444	if (!assigned)
	445	new_incr->rn = last_rn + 1;
37c5f6c8	446	if (new_incr->rn > sclp.rnmax) {
e0bc2495 HC	447	kfree(new_incr);
	448	return;
	449	}
	450	list_add(&new_incr->list, prev);
	451	}
	452
03997904 GS	453	static int sclp_mem_freeze(struct device *dev)
	454	{
	455	if (!sclp_mem_state_changed)
	456	return 0;
	457	pr_err("Memory hotplug state changed, suspend refused.\n");
	458	return -EPERM;
	459	}
	460
e0bc2495 HC	461	struct read_storage_sccb {
	462	struct sccb_header header;
	463	u16 max_id;
	464	u16 assigned;
	465	u16 standby;
	466	u16 :16;
	467	u32 entries[0];
	468	} __packed;
	469
47145210	470	static const struct dev_pm_ops sclp_mem_pm_ops = {
03997904 GS	471	.freeze = sclp_mem_freeze,
	472	};
	473
	474	static struct platform_driver sclp_mem_pdrv = {
	475	.driver = {
	476	.name = "sclp_mem",
	477	.pm = &sclp_mem_pm_ops,
	478	},
	479	};
	480
e0bc2495 HC	481	static int __init sclp_detect_standby_memory(void)
e0bc2495 HC	482	{
03997904	483	struct platform_device *sclp_pdev;
e0bc2495 HC	484	struct read_storage_sccb *sccb;
	485	int i, id, assigned, rc;
	486
52319b45 MH	487	if (OLDMEM_BASE) /* No standby memory in kdump mode */
52319b45 MH	488	return 0;
78335a30	489	if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
e0bc2495 HC	490	return 0;
	491	rc = -ENOMEM;
	492	sccb = (void *) __get_free_page(GFP_KERNEL \| GFP_DMA);
	493	if (!sccb)
	494	goto out;
	495	assigned = 0;
	496	for (id = 0; id <= sclp_max_storage_id; id++) {
	497	memset(sccb, 0, PAGE_SIZE);
	498	sccb->header.length = PAGE_SIZE;
d475f942	499	rc = sclp_sync_request(0x00040001 \| id << 8, sccb);
e0bc2495 HC	500	if (rc)
	501	goto out;
	502	switch (sccb->header.response_code) {
	503	case 0x0010:
	504	set_bit(id, sclp_storage_ids);
	505	for (i = 0; i < sccb->assigned; i++) {
	506	if (!sccb->entries[i])
	507	continue;
	508	assigned++;
	509	insert_increment(sccb->entries[i] >> 16, 0, 1);
	510	}
	511	break;
	512	case 0x0310:
	513	break;
	514	case 0x0410:
	515	for (i = 0; i < sccb->assigned; i++) {
	516	if (!sccb->entries[i])
	517	continue;
	518	assigned++;
	519	insert_increment(sccb->entries[i] >> 16, 1, 1);
	520	}
	521	break;
	522	default:
	523	rc = -EIO;
	524	break;
	525	}
	526	if (!rc)
	527	sclp_max_storage_id = sccb->max_id;
	528	}
	529	if (rc \|\| list_empty(&sclp_mem_list))
	530	goto out;
37c5f6c8	531	for (i = 1; i <= sclp.rnmax - assigned; i++)
e0bc2495 HC	532	insert_increment(0, 1, 0);
	533	rc = register_memory_notifier(&sclp_mem_nb);
	534	if (rc)
	535	goto out;
03997904 GS	536	rc = platform_driver_register(&sclp_mem_pdrv);
	537	if (rc)
	538	goto out;
	539	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
5896f8fe	540	rc = PTR_ERR_OR_ZERO(sclp_pdev);
03997904 GS	541	if (rc)
03997904 GS	542	goto out_driver;
e0bc2495	543	sclp_add_standby_memory();
03997904 GS	544	goto out;
	545	out_driver:
	546	platform_driver_unregister(&sclp_mem_pdrv);
e0bc2495 HC	547	out:
	548	free_page((unsigned long) sccb);
	549	return rc;
	550	}
	551	__initcall(sclp_detect_standby_memory);
	552
	553	#endif /* CONFIG_MEMORY_HOTPLUG */
	554
4b28a8fe HC	555	/*
	556	* Channel path configuration related functions.
	557	*/
	558
	559	#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
	560	#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
	561	#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
	562
	563	struct chp_cfg_sccb {
	564	struct sccb_header header;
	565	u8 ccm;
	566	u8 reserved[6];
	567	u8 cssid;
	568	} __attribute__((packed));
	569
	570	static int do_chp_configure(sclp_cmdw_t cmd)
	571	{
	572	struct chp_cfg_sccb *sccb;
	573	int rc;
	574
	575	if (!SCLP_HAS_CHP_RECONFIG)
	576	return -EOPNOTSUPP;
	577	/* Prepare sccb. */
	578	sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	579	if (!sccb)
	580	return -ENOMEM;
	581	sccb->header.length = sizeof(*sccb);
d475f942	582	rc = sclp_sync_request(cmd, sccb);
4b28a8fe HC	583	if (rc)
	584	goto out;
	585	switch (sccb->header.response_code) {
	586	case 0x0020:
	587	case 0x0120:
	588	case 0x0440:
	589	case 0x0450:
	590	break;
	591	default:
baebc70a JP	592	pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
baebc70a JP	593	cmd, sccb->header.response_code);
4b28a8fe HC	594	rc = -EIO;
	595	break;
	596	}
	597	out:
	598	free_page((unsigned long) sccb);
	599	return rc;
	600	}
	601
	602	/**
	603	* sclp_chp_configure - perform configure channel-path sclp command
	604	* @chpid: channel-path ID
	605	*
	606	* Perform configure channel-path command sclp command for specified chpid.
	607	* Return 0 after command successfully finished, non-zero otherwise.
	608	*/
	609	int sclp_chp_configure(struct chp_id chpid)
	610	{
	611	return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH \| chpid.id << 8);
	612	}
	613
	614	/**
	615	* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
	616	* @chpid: channel-path ID
	617	*
	618	* Perform deconfigure channel-path command sclp command for specified chpid
	619	* and wait for completion. On success return 0. Return non-zero otherwise.
	620	*/
	621	int sclp_chp_deconfigure(struct chp_id chpid)
	622	{
	623	return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH \| chpid.id << 8);
	624	}
	625
	626	struct chp_info_sccb {
	627	struct sccb_header header;
	628	u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
	629	u8 standby[SCLP_CHP_INFO_MASK_SIZE];
	630	u8 configured[SCLP_CHP_INFO_MASK_SIZE];
	631	u8 ccm;
	632	u8 reserved[6];
	633	u8 cssid;
	634	} __attribute__((packed));
	635
	636	/**
	637	* sclp_chp_read_info - perform read channel-path information sclp command
	638	* @info: resulting channel-path information data
	639	*
	640	* Perform read channel-path information sclp command and wait for completion.
	641	* On success, store channel-path information in @info and return 0. Return
	642	* non-zero otherwise.
	643	*/
	644	int sclp_chp_read_info(struct sclp_chp_info *info)
	645	{
	646	struct chp_info_sccb *sccb;
	647	int rc;
	648
	649	if (!SCLP_HAS_CHP_INFO)
	650	return -EOPNOTSUPP;
	651	/* Prepare sccb. */
	652	sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL \| GFP_DMA);
	653	if (!sccb)
	654	return -ENOMEM;
	655	sccb->header.length = sizeof(*sccb);
d475f942	656	rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
4b28a8fe HC	657	if (rc)
	658	goto out;
	659	if (sccb->header.response_code != 0x0010) {
baebc70a JP	660	pr_warn("read channel-path info failed (response=0x%04x)\n",
baebc70a JP	661	sccb->header.response_code);
4b28a8fe HC	662	rc = -EIO;
	663	goto out;
	664	}
	665	memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
	666	memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
	667	memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
	668	out:
	669	free_page((unsigned long) sccb);
	670	return rc;
	671	}