drivers/s390/char/zcore.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-1.0+
 /*
  * zcore module to export memory content and register sets for creating system
  * dumps on SCSI/NVMe disks (zfcp/nvme dump).
  *
  * For more information please refer to Documentation/arch/s390/zfcpdump.rst
  *
  * Copyright IBM Corp. 2003, 2008
  * Author(s): Michael Holzheu
  */

 #define KMSG_COMPONENT "zdump"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/debugfs.h>
 #include <linux/panic_notifier.h>
 #include <linux/reboot.h>
 #include <linux/uio.h>

 #include <asm/asm-offsets.h>
 #include <asm/ipl.h>
 #include <asm/sclp.h>
 #include <asm/setup.h>
 #include <linux/uaccess.h>
 #include <asm/debug.h>
 #include <asm/processor.h>
 #include <asm/irqflags.h>
 #include <asm/checksum.h>
 #include <asm/os_info.h>
 #include <asm/switch_to.h>
 #include <asm/maccess.h>
 #include "sclp.h"

 #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)

 enum arch_id {
 	ARCH_S390	= 0,
 	ARCH_S390X	= 1,
 };

 struct ipib_info {
 	unsigned long	ipib;
 	u32		checksum;
 }  __attribute__((packed));

 static struct debug_info *zcore_dbf;
 static int hsa_available;
 static struct dentry *zcore_dir;
 static struct dentry *zcore_reipl_file;
 static struct dentry *zcore_hsa_file;
 static struct ipl_parameter_block *zcore_ipl_block;
 static unsigned long os_info_flags;

 static DEFINE_MUTEX(hsa_buf_mutex);
 static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE);

 /*
  * Copy memory from HSA to iterator (not reentrant):
  *
  * @iter:  Iterator where memory should be copied to
  * @src:   Start address within HSA where data should be copied
  * @count: Size of buffer, which should be copied
  */
 size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count)
 {
 	size_t bytes, copied, res = 0;
 	unsigned long offset;

 	if (!hsa_available)
 		return 0;

 	mutex_lock(&hsa_buf_mutex);
 	while (count) {
 		if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
 			TRACE("sclp_sdias_copy() failed\n");
 			break;
 		}
 		offset = src % PAGE_SIZE;
 		bytes = min(PAGE_SIZE - offset, count);
 		copied = copy_to_iter(hsa_buf + offset, bytes, iter);
 		count -= copied;
 		src += copied;
 		res += copied;
 		if (copied < bytes)
 			break;
 	}
 	mutex_unlock(&hsa_buf_mutex);
 	return res;
 }

 /*
  * Copy memory from HSA to kernel memory (not reentrant):
  *
  * @dest:  Kernel or user buffer where memory should be copied to
  * @src:   Start address within HSA where data should be copied
  * @count: Size of buffer, which should be copied
  */
 static inline int memcpy_hsa_kernel(void *dst, unsigned long src, size_t count)
 {
 	struct iov_iter iter;
 	struct kvec kvec;

 	kvec.iov_base = dst;
 	kvec.iov_len = count;
 	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
 	if (memcpy_hsa_iter(&iter, src, count) < count)
 		return -EIO;
 	return 0;
 }

 static int __init init_cpu_info(void)
 {
 	struct save_area *sa;

 	/* get info for boot cpu from lowcore, stored in the HSA */
 	sa = save_area_boot_cpu();
 	if (!sa)
 		return -ENOMEM;
 	if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) {
 		TRACE("could not copy from HSA\n");
 		return -EIO;
 	}
 	save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */
 	return 0;
 }

 /*
  * Release the HSA
  */
 static void release_hsa(void)
 {
 	diag308(DIAG308_REL_HSA, NULL);
 	hsa_available = 0;
 }

 static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
 				 size_t count, loff_t *ppos)
 {
 	if (zcore_ipl_block) {
 		diag308(DIAG308_SET, zcore_ipl_block);
 		if (os_info_flags & OS_INFO_FLAG_REIPL_CLEAR)
 			diag308(DIAG308_LOAD_CLEAR, NULL);
 		/* Use special diag308 subcode for CCW normal ipl */
 		if (zcore_ipl_block->pb0_hdr.pbt == IPL_PBT_CCW)
 			diag308(DIAG308_LOAD_NORMAL_DUMP, NULL);
 		else
 			diag308(DIAG308_LOAD_NORMAL, NULL);
 	}
 	return count;
 }

 static int zcore_reipl_open(struct inode *inode, struct file *filp)
 {
 	return stream_open(inode, filp);
 }

 static int zcore_reipl_release(struct inode *inode, struct file *filp)
 {
 	return 0;
 }

 static const struct file_operations zcore_reipl_fops = {
 	.owner		= THIS_MODULE,
 	.write		= zcore_reipl_write,
 	.open		= zcore_reipl_open,
 	.release	= zcore_reipl_release,
 	.llseek		= no_llseek,
 };

 static ssize_t zcore_hsa_read(struct file *filp, char __user *buf,
 			      size_t count, loff_t *ppos)
 {
 	static char str[18];

 	if (hsa_available)
 		snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size);
 	else
 		snprintf(str, sizeof(str), "0\n");
 	return simple_read_from_buffer(buf, count, ppos, str, strlen(str));
 }

 static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf,
 			       size_t count, loff_t *ppos)
 {
 	char value;

 	if (*ppos != 0)
 		return -EPIPE;
 	if (copy_from_user(&value, buf, 1))
 		return -EFAULT;
 	if (value != '0')
 		return -EINVAL;
 	release_hsa();
 	return count;
 }

 static const struct file_operations zcore_hsa_fops = {
 	.owner		= THIS_MODULE,
 	.write		= zcore_hsa_write,
 	.read		= zcore_hsa_read,
 	.open		= nonseekable_open,
 	.llseek		= no_llseek,
 };

 static int __init check_sdias(void)
 {
 	if (!sclp.hsa_size) {
 		TRACE("Could not determine HSA size\n");
 		return -ENODEV;
 	}
 	return 0;
 }

 /*
  * Provide IPL parameter information block from either HSA or memory
  * for future reipl
  */
 static int __init zcore_reipl_init(void)
 {
 	struct os_info_entry *entry;
 	struct ipib_info ipib_info;
 	unsigned long os_info_addr;
 	struct os_info *os_info;
 	int rc;

 	rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
 	if (rc)
 		return rc;
 	if (ipib_info.ipib == 0)
 		return 0;
 	zcore_ipl_block = (void *) __get_free_page(GFP_KERNEL);
 	if (!zcore_ipl_block)
 		return -ENOMEM;
 	if (ipib_info.ipib < sclp.hsa_size)
 		rc = memcpy_hsa_kernel(zcore_ipl_block, ipib_info.ipib,
 				       PAGE_SIZE);
 	else
 		rc = memcpy_real(zcore_ipl_block, ipib_info.ipib, PAGE_SIZE);
 	if (rc || (__force u32)csum_partial(zcore_ipl_block, zcore_ipl_block->hdr.len, 0) !=
 	    ipib_info.checksum) {
 		TRACE("Checksum does not match\n");
 		free_page((unsigned long) zcore_ipl_block);
 		zcore_ipl_block = NULL;
 	}
 	/*
 	 * Read the bit-flags field from os_info flags entry.
 	 * Return zero even for os_info read or entry checksum errors in order
 	 * to continue dump processing, considering that os_info could be
 	 * corrupted on the panicked system.
 	 */
 	os_info = (void *)__get_free_page(GFP_KERNEL);
 	if (!os_info)
 		return -ENOMEM;
 	rc = memcpy_hsa_kernel(&os_info_addr, __LC_OS_INFO, sizeof(os_info_addr));
 	if (rc)
 		goto out;
 	if (os_info_addr < sclp.hsa_size)
 		rc = memcpy_hsa_kernel(os_info, os_info_addr, PAGE_SIZE);
 	else
 		rc = memcpy_real(os_info, os_info_addr, PAGE_SIZE);
 	if (rc || os_info_csum(os_info) != os_info->csum)
 		goto out;
 	entry = &os_info->entry[OS_INFO_FLAGS_ENTRY];
 	if (entry->addr && entry->size) {
 		if (entry->addr < sclp.hsa_size)
 			rc = memcpy_hsa_kernel(&os_info_flags, entry->addr, sizeof(os_info_flags));
 		else
 			rc = memcpy_real(&os_info_flags, entry->addr, sizeof(os_info_flags));
 		if (rc || (__force u32)csum_partial(&os_info_flags, entry->size, 0) != entry->csum)
 			os_info_flags = 0;
 	}
 out:
 	free_page((unsigned long)os_info);
 	return 0;
 }

 static int zcore_reboot_and_on_panic_handler(struct notifier_block *self,
 					     unsigned long	   event,
 					     void		   *data)
 {
 	if (hsa_available)
 		release_hsa();

 	return NOTIFY_OK;
 }

 static struct notifier_block zcore_reboot_notifier = {
 	.notifier_call	= zcore_reboot_and_on_panic_handler,
 	/* we need to be notified before reipl and kdump */
 	.priority	= INT_MAX,
 };

 static struct notifier_block zcore_on_panic_notifier = {
 	.notifier_call	= zcore_reboot_and_on_panic_handler,
 	/* we need to be notified before reipl and kdump */
 	.priority	= INT_MAX,
 };

 static int __init zcore_init(void)
 {
 	unsigned char arch;
 	int rc;

 	if (!is_ipl_type_dump())
 		return -ENODATA;
 	if (oldmem_data.start)
 		return -ENODATA;

 	zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
 	debug_register_view(zcore_dbf, &debug_sprintf_view);
 	debug_set_level(zcore_dbf, 6);

 	if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
 		TRACE("type:   fcp\n");
 		TRACE("devno:  %x\n", ipl_info.data.fcp.dev_id.devno);
 		TRACE("wwpn:   %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
 		TRACE("lun:    %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
 	} else if (ipl_info.type == IPL_TYPE_NVME_DUMP) {
 		TRACE("type:   nvme\n");
 		TRACE("fid:    %x\n", ipl_info.data.nvme.fid);
 		TRACE("nsid:   %x\n", ipl_info.data.nvme.nsid);
 	} else if (ipl_info.type == IPL_TYPE_ECKD_DUMP) {
 		TRACE("type:   eckd\n");
 		TRACE("devno:  %x\n", ipl_info.data.eckd.dev_id.devno);
 		TRACE("ssid:   %x\n", ipl_info.data.eckd.dev_id.ssid);
 	}

 	rc = sclp_sdias_init();
 	if (rc)
 		goto fail;

 	rc = check_sdias();
 	if (rc)
 		goto fail;
 	hsa_available = 1;

 	rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
 	if (rc)
 		goto fail;

 	if (arch == ARCH_S390) {
 		pr_alert("The 64-bit dump tool cannot be used for a "
 			 "32-bit system\n");
 		rc = -EINVAL;
 		goto fail;
 	}

 	pr_alert("The dump process started for a 64-bit operating system\n");
 	rc = init_cpu_info();
 	if (rc)
 		goto fail;

 	rc = zcore_reipl_init();
 	if (rc)
 		goto fail;

 	zcore_dir = debugfs_create_dir("zcore" , NULL);
 	zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
 						NULL, &zcore_reipl_fops);
 	zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir,
 					     NULL, &zcore_hsa_fops);

 	register_reboot_notifier(&zcore_reboot_notifier);
 	atomic_notifier_chain_register(&panic_notifier_list, &zcore_on_panic_notifier);

 	return 0;
 fail:
 	diag308(DIAG308_REL_HSA, NULL);
 	return rc;
 }
 subsys_initcall(zcore_init);
	// SPDX-License-Identifier: GPL-1.0+
	/*
	* zcore module to export memory content and register sets for creating system
	* dumps on SCSI/NVMe disks (zfcp/nvme dump).
	*
	* For more information please refer to Documentation/arch/s390/zfcpdump.rst
	*
	* Copyright IBM Corp. 2003, 2008
	* Author(s): Michael Holzheu
	*/

	#define KMSG_COMPONENT "zdump"
	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/debugfs.h>
	#include <linux/panic_notifier.h>
	#include <linux/reboot.h>
	#include <linux/uio.h>

	#include <asm/asm-offsets.h>
	#include <asm/ipl.h>
	#include <asm/sclp.h>
	#include <asm/setup.h>
	#include <linux/uaccess.h>
	#include <asm/debug.h>
	#include <asm/processor.h>
	#include <asm/irqflags.h>
	#include <asm/checksum.h>
	#include <asm/os_info.h>
	#include <asm/switch_to.h>
	#include <asm/maccess.h>
	#include "sclp.h"

	#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)

	enum arch_id {
	ARCH_S390 = 0,
	ARCH_S390X = 1,
	};

	struct ipib_info {
	unsigned long ipib;
	u32 checksum;
	} __attribute__((packed));

	static struct debug_info *zcore_dbf;
	static int hsa_available;
	static struct dentry *zcore_dir;
	static struct dentry *zcore_reipl_file;
	static struct dentry *zcore_hsa_file;
	static struct ipl_parameter_block *zcore_ipl_block;
	static unsigned long os_info_flags;

	static DEFINE_MUTEX(hsa_buf_mutex);
	static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE);

	/*
	* Copy memory from HSA to iterator (not reentrant):
	*
	* @iter: Iterator where memory should be copied to
	* @src: Start address within HSA where data should be copied
	* @count: Size of buffer, which should be copied
	*/
	size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count)
	{
	size_t bytes, copied, res = 0;
	unsigned long offset;

	if (!hsa_available)
	return 0;

	mutex_lock(&hsa_buf_mutex);
	while (count) {
	if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) {
	TRACE("sclp_sdias_copy() failed\n");
	break;
	}
	offset = src % PAGE_SIZE;
	bytes = min(PAGE_SIZE - offset, count);
	copied = copy_to_iter(hsa_buf + offset, bytes, iter);
	count -= copied;
	src += copied;
	res += copied;
	if (copied < bytes)
	break;
	}
	mutex_unlock(&hsa_buf_mutex);
	return res;
	}

	/*
	* Copy memory from HSA to kernel memory (not reentrant):
	*
	* @dest: Kernel or user buffer where memory should be copied to
	* @src: Start address within HSA where data should be copied
	* @count: Size of buffer, which should be copied
	*/
	static inline int memcpy_hsa_kernel(void *dst, unsigned long src, size_t count)
	{
	struct iov_iter iter;
	struct kvec kvec;

	kvec.iov_base = dst;
	kvec.iov_len = count;
	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
	if (memcpy_hsa_iter(&iter, src, count) < count)
	return -EIO;
	return 0;
	}

	static int __init init_cpu_info(void)
	{
	struct save_area *sa;

	/* get info for boot cpu from lowcore, stored in the HSA */
	sa = save_area_boot_cpu();
	if (!sa)
	return -ENOMEM;
	if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) {
	TRACE("could not copy from HSA\n");
	return -EIO;
	}
	save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */
	return 0;
	}

	/*
	* Release the HSA
	*/
	static void release_hsa(void)
	{
	diag308(DIAG308_REL_HSA, NULL);
	hsa_available = 0;
	}

	static ssize_t zcore_reipl_write(struct file filp, const char __user buf,
	size_t count, loff_t *ppos)
	{
	if (zcore_ipl_block) {
	diag308(DIAG308_SET, zcore_ipl_block);
	if (os_info_flags & OS_INFO_FLAG_REIPL_CLEAR)
	diag308(DIAG308_LOAD_CLEAR, NULL);
	/* Use special diag308 subcode for CCW normal ipl */
	if (zcore_ipl_block->pb0_hdr.pbt == IPL_PBT_CCW)
	diag308(DIAG308_LOAD_NORMAL_DUMP, NULL);
	else
	diag308(DIAG308_LOAD_NORMAL, NULL);
	}
	return count;
	}

	static int zcore_reipl_open(struct inode inode, struct file filp)
	{
	return stream_open(inode, filp);
	}

	static int zcore_reipl_release(struct inode inode, struct file filp)
	{
	return 0;
	}

	static const struct file_operations zcore_reipl_fops = {
	.owner = THIS_MODULE,
	.write = zcore_reipl_write,
	.open = zcore_reipl_open,
	.release = zcore_reipl_release,
	.llseek = no_llseek,
	};

	static ssize_t zcore_hsa_read(struct file filp, char __user buf,
	size_t count, loff_t *ppos)
	{
	static char str[18];

	if (hsa_available)
	snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size);
	else
	snprintf(str, sizeof(str), "0\n");
	return simple_read_from_buffer(buf, count, ppos, str, strlen(str));
	}

	static ssize_t zcore_hsa_write(struct file filp, const char __user buf,
	size_t count, loff_t *ppos)
	{
	char value;

	if (*ppos != 0)
	return -EPIPE;
	if (copy_from_user(&value, buf, 1))
	return -EFAULT;
	if (value != '0')
	return -EINVAL;
	release_hsa();
	return count;
	}

	static const struct file_operations zcore_hsa_fops = {
	.owner = THIS_MODULE,
	.write = zcore_hsa_write,
	.read = zcore_hsa_read,
	.open = nonseekable_open,
	.llseek = no_llseek,
	};

	static int __init check_sdias(void)
	{
	if (!sclp.hsa_size) {
	TRACE("Could not determine HSA size\n");
	return -ENODEV;
	}
	return 0;
	}

	/*
	* Provide IPL parameter information block from either HSA or memory
	* for future reipl
	*/
	static int __init zcore_reipl_init(void)
	{
	struct os_info_entry *entry;
	struct ipib_info ipib_info;
	unsigned long os_info_addr;
	struct os_info *os_info;
	int rc;

	rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
	if (rc)
	return rc;
	if (ipib_info.ipib == 0)
	return 0;
	zcore_ipl_block = (void *) __get_free_page(GFP_KERNEL);
	if (!zcore_ipl_block)
	return -ENOMEM;
	if (ipib_info.ipib < sclp.hsa_size)
	rc = memcpy_hsa_kernel(zcore_ipl_block, ipib_info.ipib,
	PAGE_SIZE);
	else
	rc = memcpy_real(zcore_ipl_block, ipib_info.ipib, PAGE_SIZE);
	if (rc \|\| (__force u32)csum_partial(zcore_ipl_block, zcore_ipl_block->hdr.len, 0) !=
	ipib_info.checksum) {
	TRACE("Checksum does not match\n");
	free_page((unsigned long) zcore_ipl_block);
	zcore_ipl_block = NULL;
	}
	/*
	* Read the bit-flags field from os_info flags entry.
	* Return zero even for os_info read or entry checksum errors in order
	* to continue dump processing, considering that os_info could be
	* corrupted on the panicked system.
	*/
	os_info = (void *)__get_free_page(GFP_KERNEL);
	if (!os_info)
	return -ENOMEM;
	rc = memcpy_hsa_kernel(&os_info_addr, __LC_OS_INFO, sizeof(os_info_addr));
	if (rc)
	goto out;
	if (os_info_addr < sclp.hsa_size)
	rc = memcpy_hsa_kernel(os_info, os_info_addr, PAGE_SIZE);
	else
	rc = memcpy_real(os_info, os_info_addr, PAGE_SIZE);
	if (rc \|\| os_info_csum(os_info) != os_info->csum)
	goto out;
	entry = &os_info->entry[OS_INFO_FLAGS_ENTRY];
	if (entry->addr && entry->size) {
	if (entry->addr < sclp.hsa_size)
	rc = memcpy_hsa_kernel(&os_info_flags, entry->addr, sizeof(os_info_flags));
	else
	rc = memcpy_real(&os_info_flags, entry->addr, sizeof(os_info_flags));
	if (rc \|\| (__force u32)csum_partial(&os_info_flags, entry->size, 0) != entry->csum)
	os_info_flags = 0;
	}
	out:
	free_page((unsigned long)os_info);
	return 0;
	}

	static int zcore_reboot_and_on_panic_handler(struct notifier_block *self,
	unsigned long event,
	void *data)
	{
	if (hsa_available)
	release_hsa();

	return NOTIFY_OK;
	}

	static struct notifier_block zcore_reboot_notifier = {
	.notifier_call = zcore_reboot_and_on_panic_handler,
	/* we need to be notified before reipl and kdump */
	.priority = INT_MAX,
	};

	static struct notifier_block zcore_on_panic_notifier = {
	.notifier_call = zcore_reboot_and_on_panic_handler,
	/* we need to be notified before reipl and kdump */
	.priority = INT_MAX,
	};

	static int __init zcore_init(void)
	{
	unsigned char arch;
	int rc;

	if (!is_ipl_type_dump())
	return -ENODATA;
	if (oldmem_data.start)
	return -ENODATA;

	zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
	debug_register_view(zcore_dbf, &debug_sprintf_view);
	debug_set_level(zcore_dbf, 6);

	if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
	TRACE("type: fcp\n");
	TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
	TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
	TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
	} else if (ipl_info.type == IPL_TYPE_NVME_DUMP) {
	TRACE("type: nvme\n");
	TRACE("fid: %x\n", ipl_info.data.nvme.fid);
	TRACE("nsid: %x\n", ipl_info.data.nvme.nsid);
	} else if (ipl_info.type == IPL_TYPE_ECKD_DUMP) {
	TRACE("type: eckd\n");
	TRACE("devno: %x\n", ipl_info.data.eckd.dev_id.devno);
	TRACE("ssid: %x\n", ipl_info.data.eckd.dev_id.ssid);
	}

	rc = sclp_sdias_init();
	if (rc)
	goto fail;

	rc = check_sdias();
	if (rc)
	goto fail;
	hsa_available = 1;

	rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
	if (rc)
	goto fail;

	if (arch == ARCH_S390) {
	pr_alert("The 64-bit dump tool cannot be used for a "
	"32-bit system\n");
	rc = -EINVAL;
	goto fail;
	}

	pr_alert("The dump process started for a 64-bit operating system\n");
	rc = init_cpu_info();
	if (rc)
	goto fail;

	rc = zcore_reipl_init();
	if (rc)
	goto fail;

	zcore_dir = debugfs_create_dir("zcore" , NULL);
	zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
	NULL, &zcore_reipl_fops);
	zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR\|S_IWUSR, zcore_dir,
	NULL, &zcore_hsa_fops);

	register_reboot_notifier(&zcore_reboot_notifier);
	atomic_notifier_chain_register(&panic_notifier_list, &zcore_on_panic_notifier);

	return 0;
	fail:
	diag308(DIAG308_REL_HSA, NULL);
	return rc;
	}
	subsys_initcall(zcore_init);