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

/*
 * zcore module to export memory content and register sets for creating system
 * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same
 * dump format as s390 standalone dumps.
 *
 * For more information please refer to Documentation/s390/zfcpdump.txt
 *
 * 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/miscdevice.h>
#include <linux/debugfs.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
#include <asm/sclp.h>
#include <asm/setup.h>
#include <asm/sigp.h>
#include <asm/uaccess.h>
#include <asm/debug.h>
#include <asm/processor.h>
#include <asm/irqflags.h>
#include <asm/checksum.h>
#include "sclp.h"

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

#define TO_USER		0
#define TO_KERNEL	1
#define CHUNK_INFO_SIZE	34 /* 2 16-byte char, each followed by blank */

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

/* dump system info */

struct sys_info {
	enum arch_id	 arch;
	unsigned long	 sa_base;
	u32		 sa_size;
	int		 cpu_map[NR_CPUS];
	unsigned long	 mem_size;
	struct save_area lc_mask;
};

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

static struct sys_info sys_info;
static struct debug_info *zcore_dbf;
static int hsa_available;
static struct dentry *zcore_dir;
static struct dentry *zcore_file;
static struct dentry *zcore_memmap_file;
static struct dentry *zcore_reipl_file;
static struct ipl_parameter_block *ipl_block;

/*
 * Copy memory from HSA to kernel or user 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
 * @mode:  Either TO_KERNEL or TO_USER
 */
static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
{
	int offs, blk_num;
	static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));

	if (count == 0)
		return 0;

	/* copy first block */
	offs = 0;
	if ((src % PAGE_SIZE) != 0) {
		blk_num = src / PAGE_SIZE + 2;
		if (sclp_sdias_copy(buf, blk_num, 1)) {
			TRACE("sclp_sdias_copy() failed\n");
			return -EIO;
		}
		offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
		if (mode == TO_USER) {
			if (copy_to_user((__force __user void*) dest,
					 buf + (src % PAGE_SIZE), offs))
				return -EFAULT;
		} else
			memcpy(dest, buf + (src % PAGE_SIZE), offs);
	}
	if (offs == count)
		goto out;

	/* copy middle */
	for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
		blk_num = (src + offs) / PAGE_SIZE + 2;
		if (sclp_sdias_copy(buf, blk_num, 1)) {
			TRACE("sclp_sdias_copy() failed\n");
			return -EIO;
		}
		if (mode == TO_USER) {
			if (copy_to_user((__force __user void*) dest + offs,
					 buf, PAGE_SIZE))
				return -EFAULT;
		} else
			memcpy(dest + offs, buf, PAGE_SIZE);
	}
	if (offs == count)
		goto out;

	/* copy last block */
	blk_num = (src + offs) / PAGE_SIZE + 2;
	if (sclp_sdias_copy(buf, blk_num, 1)) {
		TRACE("sclp_sdias_copy() failed\n");
		return -EIO;
	}
	if (mode == TO_USER) {
		if (copy_to_user((__force __user void*) dest + offs, buf,
				 PAGE_SIZE))
			return -EFAULT;
	} else
		memcpy(dest + offs, buf, count - offs);
out:
	return 0;
}

static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
{
	return memcpy_hsa((void __force *) dest, src, count, TO_USER);
}

static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
{
	return memcpy_hsa(dest, src, count, TO_KERNEL);
}

static int memcpy_real_user(void __user *dest, unsigned long src, size_t count)
{
	static char buf[4096];
	int offs = 0, size;

	while (offs < count) {
		size = min(sizeof(buf), count - offs);
		if (memcpy_real(buf, (void *) src + offs, size))
			return -EFAULT;
		if (copy_to_user(dest + offs, buf, size))
			return -EFAULT;
		offs += size;
	}
	return 0;
}

static int __init init_cpu_info(enum arch_id arch)
{
	struct save_area *sa;

	/* get info for boot cpu from lowcore, stored in the HSA */

	sa = kmalloc(sizeof(*sa), GFP_KERNEL);
	if (!sa)
		return -ENOMEM;
	if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
		TRACE("could not copy from HSA\n");
		kfree(sa);
		return -EIO;
	}
	zfcpdump_save_areas[0] = sa;
	return 0;
}

static DEFINE_MUTEX(zcore_mutex);

#define DUMP_VERSION	0x5
#define DUMP_MAGIC	0xa8190173618f23fdULL
#define DUMP_ARCH_S390X	2
#define DUMP_ARCH_S390	1
#define HEADER_SIZE	4096

/* dump header dumped according to s390 crash dump format */

struct zcore_header {
	u64 magic;
	u32 version;
	u32 header_size;
	u32 dump_level;
	u32 page_size;
	u64 mem_size;
	u64 mem_start;
	u64 mem_end;
	u32 num_pages;
	u32 pad1;
	u64 tod;
	struct cpuid cpu_id;
	u32 arch_id;
	u32 volnr;
	u32 build_arch;
	u64 rmem_size;
	u8 mvdump;
	u16 cpu_cnt;
	u16 real_cpu_cnt;
	u8 end_pad1[0x200-0x061];
	u64 mvdump_sign;
	u64 mvdump_zipl_time;
	u8 end_pad2[0x800-0x210];
	u32 lc_vec[512];
} __attribute__((packed,__aligned__(16)));

static struct zcore_header zcore_header = {
	.magic		= DUMP_MAGIC,
	.version	= DUMP_VERSION,
	.header_size	= 4096,
	.dump_level	= 0,
	.page_size	= PAGE_SIZE,
	.mem_start	= 0,
#ifdef CONFIG_64BIT
	.build_arch	= DUMP_ARCH_S390X,
#else
	.build_arch	= DUMP_ARCH_S390,
#endif
};

/*
 * Copy lowcore info to buffer. Use map in order to copy only register parts.
 *
 * @buf:    User buffer
 * @sa:     Pointer to save area
 * @sa_off: Offset in save area to copy
 * @len:    Number of bytes to copy
 */
static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
{
	int i;
	char *lc_mask = (char*)&sys_info.lc_mask;

	for (i = 0; i < len; i++) {
		if (!lc_mask[i + sa_off])
			continue;
		if (copy_to_user(buf + i, sa + sa_off + i, 1))
			return -EFAULT;
	}
	return 0;
}

/*
 * Copy lowcores info to memory, if necessary
 *
 * @buf:   User buffer
 * @addr:  Start address of buffer in dump memory
 * @count: Size of buffer
 */
static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
{
	unsigned long end;
	int i = 0;

	if (count == 0)
		return 0;

	end = start + count;
	while (zfcpdump_save_areas[i]) {
		unsigned long cp_start, cp_end; /* copy range */
		unsigned long sa_start, sa_end; /* save area range */
		unsigned long prefix;
		unsigned long sa_off, len, buf_off;

		prefix = zfcpdump_save_areas[i]->pref_reg;
		sa_start = prefix + sys_info.sa_base;
		sa_end = prefix + sys_info.sa_base + sys_info.sa_size;

		if ((end < sa_start) || (start > sa_end))
			goto next;
		cp_start = max(start, sa_start);
		cp_end = min(end, sa_end);

		buf_off = cp_start - start;
		sa_off = cp_start - sa_start;
		len = cp_end - cp_start;

		TRACE("copy_lc for: %lx\n", start);
		if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
			return -EFAULT;
next:
		i++;
	}
	return 0;
}

/*
 * Read routine for zcore character device
 * First 4K are dump header
 * Next 32MB are HSA Memory
 * Rest is read from absolute Memory
 */
static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
			  loff_t *ppos)
{
	unsigned long mem_start; /* Start address in memory */
	size_t mem_offs;	 /* Offset in dump memory */
	size_t hdr_count;	 /* Size of header part of output buffer */
	size_t size;
	int rc;

	mutex_lock(&zcore_mutex);

	if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
		rc = -EINVAL;
		goto fail;
	}

	count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));

	/* Copy dump header */
	if (*ppos < HEADER_SIZE) {
		size = min(count, (size_t) (HEADER_SIZE - *ppos));
		if (copy_to_user(buf, &zcore_header + *ppos, size)) {
			rc = -EFAULT;
			goto fail;
		}
		hdr_count = size;
		mem_start = 0;
	} else {
		hdr_count = 0;
		mem_start = *ppos - HEADER_SIZE;
	}

	mem_offs = 0;

	/* Copy from HSA data */
	if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
		size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
			   - mem_start));
		rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
		if (rc)
			goto fail;

		mem_offs += size;
	}

	/* Copy from real mem */
	size = count - mem_offs - hdr_count;
	rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
			      size);
	if (rc)
		goto fail;

	/*
	 * Since s390 dump analysis tools like lcrash or crash
	 * expect register sets in the prefix pages of the cpus,
	 * we copy them into the read buffer, if necessary.
	 * buf + hdr_count: Start of memory part of output buffer
	 * mem_start: Start memory address to copy from
	 * count - hdr_count: Size of memory area to copy
	 */
	if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
		rc = -EFAULT;
		goto fail;
	}
	*ppos += count;
fail:
	mutex_unlock(&zcore_mutex);
	return (rc < 0) ? rc : count;
}

static int zcore_open(struct inode *inode, struct file *filp)
{
	if (!hsa_available)
		return -ENODATA;
	else
		return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
}

static int zcore_release(struct inode *inode, struct file *filep)
{
	diag308(DIAG308_REL_HSA, NULL);
	hsa_available = 0;
	return 0;
}

static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
{
	loff_t rc;

	mutex_lock(&zcore_mutex);
	switch (orig) {
	case 0:
		file->f_pos = offset;
		rc = file->f_pos;
		break;
	case 1:
		file->f_pos += offset;
		rc = file->f_pos;
		break;
	default:
		rc = -EINVAL;
	}
	mutex_unlock(&zcore_mutex);
	return rc;
}

static const struct file_operations zcore_fops = {
	.owner		= THIS_MODULE,
	.llseek		= zcore_lseek,
	.read		= zcore_read,
	.open		= zcore_open,
	.release	= zcore_release,
};

static ssize_t zcore_memmap_read(struct file *filp, char __user *buf,
				 size_t count, loff_t *ppos)
{
	return simple_read_from_buffer(buf, count, ppos, filp->private_data,
				       MEMORY_CHUNKS * CHUNK_INFO_SIZE);
}

static int zcore_memmap_open(struct inode *inode, struct file *filp)
{
	int i;
	char *buf;
	struct mem_chunk *chunk_array;

	chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
			      GFP_KERNEL);
	if (!chunk_array)
		return -ENOMEM;
	detect_memory_layout(chunk_array);
	buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
	if (!buf) {
		kfree(chunk_array);
		return -ENOMEM;
	}
	for (i = 0; i < MEMORY_CHUNKS; i++) {
		sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
			(unsigned long long) chunk_array[i].addr,
			(unsigned long long) chunk_array[i].size);
		if (chunk_array[i].size == 0)
			break;
	}
	kfree(chunk_array);
	filp->private_data = buf;
	return nonseekable_open(inode, filp);
}

static int zcore_memmap_release(struct inode *inode, struct file *filp)
{
	kfree(filp->private_data);
	return 0;
}

static const struct file_operations zcore_memmap_fops = {
	.owner		= THIS_MODULE,
	.read		= zcore_memmap_read,
	.open		= zcore_memmap_open,
	.release	= zcore_memmap_release,
};

static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
				 size_t count, loff_t *ppos)
{
	if (ipl_block) {
		diag308(DIAG308_SET, ipl_block);
		diag308(DIAG308_IPL, NULL);
	}
	return count;
}

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

#ifdef CONFIG_32BIT

static void __init set_lc_mask(struct save_area *map)
{
	memset(&map->ext_save, 0xff, sizeof(map->ext_save));
	memset(&map->timer, 0xff, sizeof(map->timer));
	memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
	memset(&map->psw, 0xff, sizeof(map->psw));
	memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
	memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
	memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
	memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
	memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
}

#else /* CONFIG_32BIT */

static void __init set_lc_mask(struct save_area *map)
{
	memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
	memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
	memset(&map->psw, 0xff, sizeof(map->psw));
	memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
	memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg));
	memset(&map->tod_reg, 0xff, sizeof(map->tod_reg));
	memset(&map->timer, 0xff, sizeof(map->timer));
	memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
	memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
	memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
}

#endif /* CONFIG_32BIT */

/*
 * Initialize dump globals for a given architecture
 */
static int __init sys_info_init(enum arch_id arch)
{
	int rc;

	switch (arch) {
	case ARCH_S390X:
		pr_alert("DETECTED 'S390X (64 bit) OS'\n");
		break;
	case ARCH_S390:
		pr_alert("DETECTED 'S390 (32 bit) OS'\n");
		break;
	default:
		pr_alert("0x%x is an unknown architecture.\n",arch);
		return -EINVAL;
	}
	sys_info.sa_base = SAVE_AREA_BASE;
	sys_info.sa_size = sizeof(struct save_area);
	sys_info.arch = arch;
	set_lc_mask(&sys_info.lc_mask);
	rc = init_cpu_info(arch);
	if (rc)
		return rc;
	sys_info.mem_size = real_memory_size;

	return 0;
}

static int __init check_sdias(void)
{
	int rc, act_hsa_size;

	rc = sclp_sdias_blk_count();
	if (rc < 0) {
		TRACE("Could not determine HSA size\n");
		return rc;
	}
	act_hsa_size = (rc - 1) * PAGE_SIZE;
	if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
		TRACE("HSA size too small: %i\n", act_hsa_size);
		return -EINVAL;
	}
	return 0;
}

static int __init get_mem_size(unsigned long *mem)
{
	int i;
	struct mem_chunk *chunk_array;

	chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
			      GFP_KERNEL);
	if (!chunk_array)
		return -ENOMEM;
	detect_memory_layout(chunk_array);
	for (i = 0; i < MEMORY_CHUNKS; i++) {
		if (chunk_array[i].size == 0)
			break;
		*mem += chunk_array[i].size;
	}
	kfree(chunk_array);
	return 0;
}

static int __init zcore_header_init(int arch, struct zcore_header *hdr)
{
	int rc, i;
	unsigned long memory = 0;
	u32 prefix;

	if (arch == ARCH_S390X)
		hdr->arch_id = DUMP_ARCH_S390X;
	else
		hdr->arch_id = DUMP_ARCH_S390;
	rc = get_mem_size(&memory);
	if (rc)
		return rc;
	hdr->mem_size = memory;
	hdr->rmem_size = memory;
	hdr->mem_end = sys_info.mem_size;
	hdr->num_pages = memory / PAGE_SIZE;
	hdr->tod = get_clock();
	get_cpu_id(&hdr->cpu_id);
	for (i = 0; zfcpdump_save_areas[i]; i++) {
		prefix = zfcpdump_save_areas[i]->pref_reg;
		hdr->real_cpu_cnt++;
		if (!prefix)
			continue;
		hdr->lc_vec[hdr->cpu_cnt] = prefix;
		hdr->cpu_cnt++;
	}
	return 0;
}

/*
 * Provide IPL parameter information block from either HSA or memory
 * for future reipl
 */
static int __init zcore_reipl_init(void)
{
	struct ipib_info ipib_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;
	ipl_block = (void *) __get_free_page(GFP_KERNEL);
	if (!ipl_block)
		return -ENOMEM;
	if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE)
		rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
	else
		rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
	if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
	    ipib_info.checksum) {
		TRACE("Checksum does not match\n");
		free_page((unsigned long) ipl_block);
		ipl_block = NULL;
	}
	return 0;
}

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

	if (ipl_info.type != IPL_TYPE_FCP_DUMP)
		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);

	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);

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

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

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

#ifdef CONFIG_64BIT
	if (arch == ARCH_S390) {
		pr_alert("The 64-bit dump tool cannot be used for a "
			 "32-bit system\n");
		rc = -EINVAL;
		goto fail;
	}
#else /* CONFIG_64BIT */
	if (arch == ARCH_S390X) {
		pr_alert("The 32-bit dump tool cannot be used for a "
			 "64-bit system\n");
		rc = -EINVAL;
		goto fail;
	}
#endif /* CONFIG_64BIT */

	rc = sys_info_init(arch);
	if (rc)
		goto fail;

	rc = zcore_header_init(arch, &zcore_header);
	if (rc)
		goto fail;

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

	zcore_dir = debugfs_create_dir("zcore" , NULL);
	if (!zcore_dir) {
		rc = -ENOMEM;
		goto fail;
	}
	zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
					 &zcore_fops);
	if (!zcore_file) {
		rc = -ENOMEM;
		goto fail_dir;
	}
	zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
						NULL, &zcore_memmap_fops);
	if (!zcore_memmap_file) {
		rc = -ENOMEM;
		goto fail_file;
	}
	zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
						NULL, &zcore_reipl_fops);
	if (!zcore_reipl_file) {
		rc = -ENOMEM;
		goto fail_memmap_file;
	}
	hsa_available = 1;
	return 0;

fail_memmap_file:
	debugfs_remove(zcore_memmap_file);
fail_file:
	debugfs_remove(zcore_file);
fail_dir:
	debugfs_remove(zcore_dir);
fail:
	diag308(DIAG308_REL_HSA, NULL);
	return rc;
}

static void __exit zcore_exit(void)
{
	debug_unregister(zcore_dbf);
	sclp_sdias_exit();
	free_page((unsigned long) ipl_block);
	debugfs_remove(zcore_reipl_file);
	debugfs_remove(zcore_memmap_file);
	debugfs_remove(zcore_file);
	debugfs_remove(zcore_dir);
	diag308(DIAG308_REL_HSA, NULL);
}

MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
MODULE_DESCRIPTION("zcore module for zfcpdump support");
MODULE_LICENSE("GPL");

subsys_initcall(zcore_init);
module_exit(zcore_exit);
Commit	Line	Data
411ed322 MH	1	/*
	2	* zcore module to export memory content and register sets for creating system
	3	* dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same
	4	* dump format as s390 standalone dumps.
	5	*
	6	* For more information please refer to Documentation/s390/zfcpdump.txt
	7	*
099b7651	8	* Copyright IBM Corp. 2003,2008
411ed322 MH	9	* Author(s): Michael Holzheu
	10	*/
	11
17159dc6 MH	12	#define KMSG_COMPONENT "zdump"
	13	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	14
411ed322	15	#include <linux/init.h>
5a0e3ad6	16	#include <linux/slab.h>
411ed322	17	#include <linux/miscdevice.h>
411ed322	18	#include <linux/debugfs.h>
cbb870c8	19	#include <asm/asm-offsets.h>
411ed322 MH	20	#include <asm/ipl.h>
	21	#include <asm/sclp.h>
	22	#include <asm/setup.h>
	23	#include <asm/sigp.h>
	24	#include <asm/uaccess.h>
	25	#include <asm/debug.h>
	26	#include <asm/processor.h>
	27	#include <asm/irqflags.h>
159d1ff8	28	#include <asm/checksum.h>
763968e2	29	#include "sclp.h"
411ed322 MH	30
411ed322 MH	31	#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
411ed322 MH	32
	33	#define TO_USER 0
	34	#define TO_KERNEL 1
12e0c95e	35	#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */
411ed322 MH	36
	37	enum arch_id {
	38	ARCH_S390 = 0,
	39	ARCH_S390X = 1,
	40	};
	41
	42	/* dump system info */
	43
	44	struct sys_info {
f64ca217 HC	45	enum arch_id arch;
	46	unsigned long sa_base;
	47	u32 sa_size;
	48	int cpu_map[NR_CPUS];
	49	unsigned long mem_size;
	50	struct save_area lc_mask;
411ed322 MH	51	};
411ed322 MH	52
099b7651 FM	53	struct ipib_info {
	54	unsigned long ipib;
	55	u32 checksum;
	56	} __attribute__((packed));
	57
411ed322 MH	58	static struct sys_info sys_info;
	59	static struct debug_info *zcore_dbf;
	60	static int hsa_available;
	61	static struct dentry *zcore_dir;
	62	static struct dentry *zcore_file;
12e0c95e	63	static struct dentry *zcore_memmap_file;
099b7651 FM	64	static struct dentry *zcore_reipl_file;
099b7651 FM	65	static struct ipl_parameter_block *ipl_block;
411ed322 MH	66
	67	/*
	68	* Copy memory from HSA to kernel or user memory (not reentrant):
	69	*
	70	* @dest: Kernel or user buffer where memory should be copied to
	71	* @src: Start address within HSA where data should be copied
	72	* @count: Size of buffer, which should be copied
	73	* @mode: Either TO_KERNEL or TO_USER
	74	*/
	75	static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
	76	{
	77	int offs, blk_num;
	78	static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
	79
	80	if (count == 0)
	81	return 0;
	82
	83	/* copy first block */
	84	offs = 0;
	85	if ((src % PAGE_SIZE) != 0) {
	86	blk_num = src / PAGE_SIZE + 2;
	87	if (sclp_sdias_copy(buf, blk_num, 1)) {
	88	TRACE("sclp_sdias_copy() failed\n");
	89	return -EIO;
	90	}
	91	offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
	92	if (mode == TO_USER) {
	93	if (copy_to_user((__force __user void*) dest,
	94	buf + (src % PAGE_SIZE), offs))
	95	return -EFAULT;
	96	} else
	97	memcpy(dest, buf + (src % PAGE_SIZE), offs);
	98	}
	99	if (offs == count)
	100	goto out;
	101
	102	/* copy middle */
	103	for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
	104	blk_num = (src + offs) / PAGE_SIZE + 2;
	105	if (sclp_sdias_copy(buf, blk_num, 1)) {
	106	TRACE("sclp_sdias_copy() failed\n");
	107	return -EIO;
	108	}
	109	if (mode == TO_USER) {
	110	if (copy_to_user((__force __user void*) dest + offs,
	111	buf, PAGE_SIZE))
	112	return -EFAULT;
	113	} else
	114	memcpy(dest + offs, buf, PAGE_SIZE);
	115	}
	116	if (offs == count)
	117	goto out;
	118
	119	/* copy last block */
	120	blk_num = (src + offs) / PAGE_SIZE + 2;
	121	if (sclp_sdias_copy(buf, blk_num, 1)) {
	122	TRACE("sclp_sdias_copy() failed\n");
	123	return -EIO;
	124	}
	125	if (mode == TO_USER) {
	126	if (copy_to_user((__force __user void*) dest + offs, buf,
	127	PAGE_SIZE))
	128	return -EFAULT;
	129	} else
130	memcpy(dest + offs, buf, count - offs);
131	out:
132	return 0;
133	}
134
135	static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
136	{
137	return memcpy_hsa((void __force *) dest, src, count, TO_USER);
138	}
139
140	static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
141	{
142	return memcpy_hsa(dest, src, count, TO_KERNEL);
143	}
144
d9f774d4	145	static int memcpy_real_user(void __user *dest, unsigned long src, size_t count)
411ed322 MH	146	{
	147	static char buf[4096];
	148	int offs = 0, size;
	149
	150	while (offs < count) {
	151	size = min(sizeof(buf), count - offs);
92fe3132	152	if (memcpy_real(buf, (void *) src + offs, size))
411ed322 MH	153	return -EFAULT;
	154	if (copy_to_user(dest + offs, buf, size))
	155	return -EFAULT;
	156	offs += size;
	157	}
	158	return 0;
	159	}
	160
411ed322 MH	161	static int __init init_cpu_info(enum arch_id arch)
411ed322 MH	162	{
f64ca217	163	struct save_area *sa;
411ed322 MH	164
	165	/* get info for boot cpu from lowcore, stored in the HSA */
	166
	167	sa = kmalloc(sizeof(*sa), GFP_KERNEL);
2a062ab4	168	if (!sa)
411ed322	169	return -ENOMEM;
411ed322	170	if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
2a062ab4	171	TRACE("could not copy from HSA\n");
411ed322 MH	172	kfree(sa);
	173	return -EIO;
	174	}
	175	zfcpdump_save_areas[0] = sa;
411ed322 MH	176	return 0;
	177	}
	178
	179	static DEFINE_MUTEX(zcore_mutex);
	180
0cbde8ee	181	#define DUMP_VERSION 0x5
411ed322 MH	182	#define DUMP_MAGIC 0xa8190173618f23fdULL
	183	#define DUMP_ARCH_S390X 2
	184	#define DUMP_ARCH_S390 1
	185	#define HEADER_SIZE 4096
	186
	187	/* dump header dumped according to s390 crash dump format */
	188
	189	struct zcore_header {
	190	u64 magic;
	191	u32 version;
	192	u32 header_size;
	193	u32 dump_level;
	194	u32 page_size;
	195	u64 mem_size;
	196	u64 mem_start;
	197	u64 mem_end;
	198	u32 num_pages;
	199	u32 pad1;
	200	u64 tod;
e86a6ed6	201	struct cpuid cpu_id;
411ed322	202	u32 arch_id;
ce444823	203	u32 volnr;
411ed322	204	u32 build_arch;
ce444823	205	u64 rmem_size;
0cbde8ee MH	206	u8 mvdump;
	207	u16 cpu_cnt;
	208	u16 real_cpu_cnt;
	209	u8 end_pad1[0x200-0x061];
	210	u64 mvdump_sign;
	211	u64 mvdump_zipl_time;
	212	u8 end_pad2[0x800-0x210];
	213	u32 lc_vec[512];
411ed322 MH	214	} __attribute__((packed,__aligned__(16)));
	215
	216	static struct zcore_header zcore_header = {
	217	.magic = DUMP_MAGIC,
	218	.version = DUMP_VERSION,
	219	.header_size = 4096,
	220	.dump_level = 0,
	221	.page_size = PAGE_SIZE,
	222	.mem_start = 0,
f64ca217	223	#ifdef CONFIG_64BIT
411ed322 MH	224	.build_arch = DUMP_ARCH_S390X,
	225	#else
	226	.build_arch = DUMP_ARCH_S390,
	227	#endif
	228	};
	229
	230	/*
	231	* Copy lowcore info to buffer. Use map in order to copy only register parts.
	232	*
	233	* @buf: User buffer
	234	* @sa: Pointer to save area
	235	* @sa_off: Offset in save area to copy
	236	* @len: Number of bytes to copy
	237	*/
	238	static int copy_lc(void __user buf, void sa, int sa_off, int len)
	239	{
	240	int i;
	241	char lc_mask = (char)&sys_info.lc_mask;
	242
	243	for (i = 0; i < len; i++) {
	244	if (!lc_mask[i + sa_off])
	245	continue;
	246	if (copy_to_user(buf + i, sa + sa_off + i, 1))
	247	return -EFAULT;
	248	}
	249	return 0;
	250	}
	251
	252	/*
	253	* Copy lowcores info to memory, if necessary
	254	*
	255	* @buf: User buffer
	256	* @addr: Start address of buffer in dump memory
	257	* @count: Size of buffer
	258	*/
	259	static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
	260	{
	261	unsigned long end;
	262	int i = 0;
	263
	264	if (count == 0)
	265	return 0;
	266
	267	end = start + count;
	268	while (zfcpdump_save_areas[i]) {
	269	unsigned long cp_start, cp_end; /* copy range */
	270	unsigned long sa_start, sa_end; /* save area range */
	271	unsigned long prefix;
	272	unsigned long sa_off, len, buf_off;
	273
f64ca217	274	prefix = zfcpdump_save_areas[i]->pref_reg;
411ed322 MH	275	sa_start = prefix + sys_info.sa_base;
	276	sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
	277
	278	if ((end < sa_start) \|\| (start > sa_end))
	279	goto next;
	280	cp_start = max(start, sa_start);
	281	cp_end = min(end, sa_end);
	282
	283	buf_off = cp_start - start;
	284	sa_off = cp_start - sa_start;
	285	len = cp_end - cp_start;
	286
	287	TRACE("copy_lc for: %lx\n", start);
	288	if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
	289	return -EFAULT;
	290	next:
	291	i++;
	292	}
	293	return 0;
	294	}
	295
	296	/*
	297	* Read routine for zcore character device
	298	* First 4K are dump header
	299	* Next 32MB are HSA Memory
	300	* Rest is read from absolute Memory
	301	*/
	302	static ssize_t zcore_read(struct file file, char __user buf, size_t count,
	303	loff_t *ppos)
	304	{
	305	unsigned long mem_start; /* Start address in memory */
	306	size_t mem_offs; /* Offset in dump memory */
	307	size_t hdr_count; /* Size of header part of output buffer */
	308	size_t size;
	309	int rc;
	310
	311	mutex_lock(&zcore_mutex);
	312
	313	if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
	314	rc = -EINVAL;
	315	goto fail;
	316	}
	317
	318	count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
	319
	320	/* Copy dump header */
	321	if (*ppos < HEADER_SIZE) {
	322	size = min(count, (size_t) (HEADER_SIZE - *ppos));
	323	if (copy_to_user(buf, &zcore_header + *ppos, size)) {
	324	rc = -EFAULT;
	325	goto fail;
	326	}
	327	hdr_count = size;
	328	mem_start = 0;
	329	} else {
	330	hdr_count = 0;
	331	mem_start = *ppos - HEADER_SIZE;
	332	}
	333
	334	mem_offs = 0;
	335
	336	/* Copy from HSA data */
	337	if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
	338	size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
339	- mem_start));
340	rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
341	if (rc)
342	goto fail;
343
344	mem_offs += size;
345	}
346
347	/* Copy from real mem */
348	size = count - mem_offs - hdr_count;
349	rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
350	size);
351	if (rc)
352	goto fail;
353
354	/*
355	* Since s390 dump analysis tools like lcrash or crash
356	* expect register sets in the prefix pages of the cpus,
357	* we copy them into the read buffer, if necessary.
358	* buf + hdr_count: Start of memory part of output buffer
359	* mem_start: Start memory address to copy from
360	* count - hdr_count: Size of memory area to copy
361	*/
362	if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
363	rc = -EFAULT;
364	goto fail;
365	}
366	*ppos += count;
367	fail:
368	mutex_unlock(&zcore_mutex);
369	return (rc < 0) ? rc : count;
370	}
371
372	static int zcore_open(struct inode inode, struct file filp)
373	{
374	if (!hsa_available)
375	return -ENODATA;
376	else
377	return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
378	}
379
380	static int zcore_release(struct inode inode, struct file filep)
381	{
382	diag308(DIAG308_REL_HSA, NULL);
383	hsa_available = 0;
384	return 0;
385	}
386
387	static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
388	{
389	loff_t rc;
390
391	mutex_lock(&zcore_mutex);
392	switch (orig) {
393	case 0:
394	file->f_pos = offset;
395	rc = file->f_pos;
396	break;
397	case 1:
398	file->f_pos += offset;
399	rc = file->f_pos;
400	break;
401	default:
402	rc = -EINVAL;
403	}
404	mutex_unlock(&zcore_mutex);
405	return rc;
406	}
407
5c81cdbe	408	static const struct file_operations zcore_fops = {
411ed322 MH	409	.owner = THIS_MODULE,
	410	.llseek = zcore_lseek,
	411	.read = zcore_read,
	412	.open = zcore_open,
	413	.release = zcore_release,
	414	};
	415
12e0c95e FM	416	static ssize_t zcore_memmap_read(struct file filp, char __user buf,
	417	size_t count, loff_t *ppos)
	418	{
	419	return simple_read_from_buffer(buf, count, ppos, filp->private_data,
	420	MEMORY_CHUNKS * CHUNK_INFO_SIZE);
	421	}
	422
	423	static int zcore_memmap_open(struct inode inode, struct file filp)
	424	{
	425	int i;
	426	char *buf;
	427	struct mem_chunk *chunk_array;
	428
	429	chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
	430	GFP_KERNEL);
	431	if (!chunk_array)
	432	return -ENOMEM;
	433	detect_memory_layout(chunk_array);
	434	buf = kzalloc(MEMORY_CHUNKS * CHUNK_INFO_SIZE, GFP_KERNEL);
	435	if (!buf) {
	436	kfree(chunk_array);
	437	return -ENOMEM;
	438	}
	439	for (i = 0; i < MEMORY_CHUNKS; i++) {
	440	sprintf(buf + (i * CHUNK_INFO_SIZE), "%016llx %016llx ",
	441	(unsigned long long) chunk_array[i].addr,
	442	(unsigned long long) chunk_array[i].size);
	443	if (chunk_array[i].size == 0)
	444	break;
	445	}
	446	kfree(chunk_array);
	447	filp->private_data = buf;
58ea91c0	448	return nonseekable_open(inode, filp);
12e0c95e FM	449	}
	450
	451	static int zcore_memmap_release(struct inode inode, struct file filp)
	452	{
	453	kfree(filp->private_data);
	454	return 0;
	455	}
	456
	457	static const struct file_operations zcore_memmap_fops = {
	458	.owner = THIS_MODULE,
	459	.read = zcore_memmap_read,
	460	.open = zcore_memmap_open,
	461	.release = zcore_memmap_release,
	462	};
	463
099b7651 FM	464	static ssize_t zcore_reipl_write(struct file filp, const char __user buf,
	465	size_t count, loff_t *ppos)
	466	{
	467	if (ipl_block) {
	468	diag308(DIAG308_SET, ipl_block);
	469	diag308(DIAG308_IPL, NULL);
	470	}
	471	return count;
	472	}
	473
	474	static int zcore_reipl_open(struct inode inode, struct file filp)
	475	{
58ea91c0	476	return nonseekable_open(inode, filp);
099b7651 FM	477	}
	478
	479	static int zcore_reipl_release(struct inode inode, struct file filp)
	480	{
	481	return 0;
	482	}
	483
	484	static const struct file_operations zcore_reipl_fops = {
	485	.owner = THIS_MODULE,
	486	.write = zcore_reipl_write,
	487	.open = zcore_reipl_open,
	488	.release = zcore_reipl_release,
	489	};
	490
f64ca217	491	#ifdef CONFIG_32BIT
411ed322	492
f64ca217	493	static void __init set_lc_mask(struct save_area *map)
411ed322	494	{
f64ca217 HC	495	memset(&map->ext_save, 0xff, sizeof(map->ext_save));
	496	memset(&map->timer, 0xff, sizeof(map->timer));
	497	memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
	498	memset(&map->psw, 0xff, sizeof(map->psw));
	499	memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
	500	memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
	501	memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
	502	memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
	503	memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
411ed322 MH	504	}
411ed322 MH	505
f64ca217 HC	506	#else /* CONFIG_32BIT */
	507
	508	static void __init set_lc_mask(struct save_area *map)
411ed322	509	{
f64ca217 HC	510	memset(&map->fp_regs, 0xff, sizeof(map->fp_regs));
	511	memset(&map->gp_regs, 0xff, sizeof(map->gp_regs));
	512	memset(&map->psw, 0xff, sizeof(map->psw));
	513	memset(&map->pref_reg, 0xff, sizeof(map->pref_reg));
	514	memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg));
	515	memset(&map->tod_reg, 0xff, sizeof(map->tod_reg));
	516	memset(&map->timer, 0xff, sizeof(map->timer));
	517	memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp));
	518	memset(&map->acc_regs, 0xff, sizeof(map->acc_regs));
	519	memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs));
411ed322 MH	520	}
411ed322 MH	521
f64ca217 HC	522	#endif /* CONFIG_32BIT */
f64ca217 HC	523
411ed322 MH	524	/*
	525	* Initialize dump globals for a given architecture
	526	*/
	527	static int __init sys_info_init(enum arch_id arch)
	528	{
2a062ab4 MH	529	int rc;
2a062ab4 MH	530
411ed322 MH	531	switch (arch) {
411ed322 MH	532	case ARCH_S390X:
17159dc6	533	pr_alert("DETECTED 'S390X (64 bit) OS'\n");
411ed322 MH	534	break;
411ed322 MH	535	case ARCH_S390:
17159dc6	536	pr_alert("DETECTED 'S390 (32 bit) OS'\n");
411ed322 MH	537	break;
411ed322 MH	538	default:
17159dc6	539	pr_alert("0x%x is an unknown architecture.\n",arch);
411ed322 MH	540	return -EINVAL;
411ed322 MH	541	}
f64ca217 HC	542	sys_info.sa_base = SAVE_AREA_BASE;
f64ca217 HC	543	sys_info.sa_size = sizeof(struct save_area);
411ed322	544	sys_info.arch = arch;
f64ca217	545	set_lc_mask(&sys_info.lc_mask);
2a062ab4 MH	546	rc = init_cpu_info(arch);
	547	if (rc)
	548	return rc;
411ed322 MH	549	sys_info.mem_size = real_memory_size;
	550
	551	return 0;
	552	}
	553
	554	static int __init check_sdias(void)
	555	{
	556	int rc, act_hsa_size;
	557
	558	rc = sclp_sdias_blk_count();
	559	if (rc < 0) {
2a062ab4	560	TRACE("Could not determine HSA size\n");
411ed322 MH	561	return rc;
	562	}
	563	act_hsa_size = (rc - 1) * PAGE_SIZE;
	564	if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
2a062ab4	565	TRACE("HSA size too small: %i\n", act_hsa_size);
411ed322 MH	566	return -EINVAL;
	567	}
	568	return 0;
	569	}
	570
12e0c95e FM	571	static int __init get_mem_size(unsigned long *mem)
	572	{
	573	int i;
	574	struct mem_chunk *chunk_array;
	575
	576	chunk_array = kzalloc(MEMORY_CHUNKS * sizeof(struct mem_chunk),
	577	GFP_KERNEL);
	578	if (!chunk_array)
	579	return -ENOMEM;
	580	detect_memory_layout(chunk_array);
	581	for (i = 0; i < MEMORY_CHUNKS; i++) {
	582	if (chunk_array[i].size == 0)
	583	break;
	584	*mem += chunk_array[i].size;
	585	}
	586	kfree(chunk_array);
	587	return 0;
	588	}
	589
	590	static int __init zcore_header_init(int arch, struct zcore_header *hdr)
411ed322	591	{
0cbde8ee	592	int rc, i;
12e0c95e	593	unsigned long memory = 0;
0cbde8ee	594	u32 prefix;
12e0c95e	595
411ed322 MH	596	if (arch == ARCH_S390X)
	597	hdr->arch_id = DUMP_ARCH_S390X;
	598	else
	599	hdr->arch_id = DUMP_ARCH_S390;
12e0c95e FM	600	rc = get_mem_size(&memory);
	601	if (rc)
	602	return rc;
	603	hdr->mem_size = memory;
	604	hdr->rmem_size = memory;
411ed322	605	hdr->mem_end = sys_info.mem_size;
12e0c95e	606	hdr->num_pages = memory / PAGE_SIZE;
411ed322 MH	607	hdr->tod = get_clock();
411ed322 MH	608	get_cpu_id(&hdr->cpu_id);
0cbde8ee MH	609	for (i = 0; zfcpdump_save_areas[i]; i++) {
	610	prefix = zfcpdump_save_areas[i]->pref_reg;
	611	hdr->real_cpu_cnt++;
	612	if (!prefix)
	613	continue;
	614	hdr->lc_vec[hdr->cpu_cnt] = prefix;
	615	hdr->cpu_cnt++;
	616	}
12e0c95e	617	return 0;
411ed322 MH	618	}
411ed322 MH	619
099b7651 FM	620	/*
	621	* Provide IPL parameter information block from either HSA or memory
	622	* for future reipl
	623	*/
	624	static int __init zcore_reipl_init(void)
	625	{
	626	struct ipib_info ipib_info;
	627	int rc;
	628
	629	rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info));
	630	if (rc)
	631	return rc;
	632	if (ipib_info.ipib == 0)
	633	return 0;
	634	ipl_block = (void *) __get_free_page(GFP_KERNEL);
	635	if (!ipl_block)
	636	return -ENOMEM;
	637	if (ipib_info.ipib < ZFCPDUMP_HSA_SIZE)
	638	rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE);
	639	else
92fe3132	640	rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE);
76ef964c	641	if (rc \|\| csum_partial(ipl_block, ipl_block->hdr.len, 0) !=
159d1ff8	642	ipib_info.checksum) {
099b7651 FM	643	TRACE("Checksum does not match\n");
	644	free_page((unsigned long) ipl_block);
	645	ipl_block = NULL;
	646	}
	647	return 0;
	648	}
	649
411ed322 MH	650	static int __init zcore_init(void)
	651	{
	652	unsigned char arch;
	653	int rc;
	654
	655	if (ipl_info.type != IPL_TYPE_FCP_DUMP)
	656	return -ENODATA;
	657
	658	zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
	659	debug_register_view(zcore_dbf, &debug_sprintf_view);
	660	debug_set_level(zcore_dbf, 6);
	661
	662	TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
	663	TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
	664	TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
	665
763968e2	666	rc = sclp_sdias_init();
411ed322 MH	667	if (rc)
	668	goto fail;
	669
	670	rc = check_sdias();
2a062ab4	671	if (rc)
411ed322	672	goto fail;
411ed322 MH	673
411ed322 MH	674	rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
2a062ab4	675	if (rc)
411ed322	676	goto fail;
411ed322	677
f64ca217 HC	678	#ifdef CONFIG_64BIT
	679	if (arch == ARCH_S390) {
	680	pr_alert("The 64-bit dump tool cannot be used for a "
	681	"32-bit system\n");
	682	rc = -EINVAL;
	683	goto fail;
	684	}
	685	#else /* CONFIG_64BIT */
411ed322	686	if (arch == ARCH_S390X) {
17159dc6 MH	687	pr_alert("The 32-bit dump tool cannot be used for a "
17159dc6 MH	688	"64-bit system\n");
411ed322 MH	689	rc = -EINVAL;
	690	goto fail;
	691	}
f64ca217	692	#endif /* CONFIG_64BIT */
411ed322 MH	693
411ed322 MH	694	rc = sys_info_init(arch);
2a062ab4	695	if (rc)
411ed322	696	goto fail;
411ed322	697
12e0c95e FM	698	rc = zcore_header_init(arch, &zcore_header);
	699	if (rc)
	700	goto fail;
411ed322	701
099b7651 FM	702	rc = zcore_reipl_init();
	703	if (rc)
	704	goto fail;
	705
411ed322 MH	706	zcore_dir = debugfs_create_dir("zcore" , NULL);
	707	if (!zcore_dir) {
	708	rc = -ENOMEM;
	709	goto fail;
	710	}
	711	zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
	712	&zcore_fops);
	713	if (!zcore_file) {
411ed322	714	rc = -ENOMEM;
12e0c95e FM	715	goto fail_dir;
	716	}
	717	zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir,
	718	NULL, &zcore_memmap_fops);
	719	if (!zcore_memmap_file) {
	720	rc = -ENOMEM;
	721	goto fail_file;
411ed322	722	}
099b7651 FM	723	zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir,
	724	NULL, &zcore_reipl_fops);
	725	if (!zcore_reipl_file) {
	726	rc = -ENOMEM;
	727	goto fail_memmap_file;
	728	}
411ed322 MH	729	hsa_available = 1;
	730	return 0;
	731
099b7651 FM	732	fail_memmap_file:
099b7651 FM	733	debugfs_remove(zcore_memmap_file);
12e0c95e FM	734	fail_file:
	735	debugfs_remove(zcore_file);
	736	fail_dir:
	737	debugfs_remove(zcore_dir);
411ed322 MH	738	fail:
	739	diag308(DIAG308_REL_HSA, NULL);
	740	return rc;
	741	}
	742
411ed322 MH	743	static void __exit zcore_exit(void)
	744	{
	745	debug_unregister(zcore_dbf);
763968e2	746	sclp_sdias_exit();
099b7651 FM	747	free_page((unsigned long) ipl_block);
	748	debugfs_remove(zcore_reipl_file);
	749	debugfs_remove(zcore_memmap_file);
	750	debugfs_remove(zcore_file);
	751	debugfs_remove(zcore_dir);
411ed322 MH	752	diag308(DIAG308_REL_HSA, NULL);
	753	}
	754
099b7651	755	MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
411ed322 MH	756	MODULE_DESCRIPTION("zcore module for zfcpdump support");
	757	MODULE_LICENSE("GPL");
	758
	759	subsys_initcall(zcore_init);
	760	module_exit(zcore_exit);