linux/drivers/s390/char/zcore.c
Arnd Bergmann 6038f373a3 llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time.  Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
//   but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
   *off = E
|
   *off += E
|
   func(..., off, ...)
|
   E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
  *off = E
|
  *off += E
|
  func(..., off, ...)
|
  E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
 ...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
 .llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
 .read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
 .write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
 .open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
...  .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
...  .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
...  .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+	.llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
 .write = write_f,
 .read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-10-15 15:53:27 +02:00

763 lines
17 KiB
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,
.llseek = no_llseek,
};
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,
.llseek = no_llseek,
};
#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);