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[S390] Automatic IPL after dump

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Provide new shutdown action "dump_reipl" for automatic ipl after dump.

Signed-off-by: Frank Munzert <munzert@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Frank Munzert
2009-03-26 15:23:43 +01:00
committed by Martin Schwidefsky
parent d7fd5f1e3b
commit 099b765139
6 changed files with 172 additions and 26 deletions
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88
drivers/s390/char/zcore.c
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@ -5,7 +5,7 @@
*
* For more information please refer to Documentation/s390/zfcpdump.txt
*
* Copyright IBM Corp. 2003,2007
* Copyright IBM Corp. 2003,2008
* Author(s): Michael Holzheu
*/
@ -48,12 +48,19 @@ struct sys_info {
union 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):
@ -527,6 +534,33 @@ static const struct file_operations zcore_memmap_fops = {
.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 0;
}
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,
};
static void __init set_s390_lc_mask(union save_area *map)
{
@ -645,6 +679,39 @@ static int __init zcore_header_init(int arch, struct zcore_header *hdr)
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, ipib_info.ipib, PAGE_SIZE);
if (rc) {
free_page((unsigned long) ipl_block);
return rc;
}
if (cksm(ipl_block, ipl_block->hdr.len) != 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;
@ -690,6 +757,10 @@ static int __init zcore_init(void)
if (rc)
goto fail;
rc = zcore_reipl_init();
if (rc)
goto fail;
zcore_dir = debugfs_create_dir("zcore" , NULL);
if (!zcore_dir) {
rc = -ENOMEM;
@ -707,9 +778,17 @@ static int __init zcore_init(void)
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:
@ -723,10 +802,15 @@ 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. 2003,2007");
MODULE_AUTHOR("Copyright IBM Corp. 2003,2008");
MODULE_DESCRIPTION("zcore module for zfcpdump support");
MODULE_LICENSE("GPL");