diff options
Diffstat (limited to 'drivers/s390/char/zcore.c')
| -rw-r--r-- | drivers/s390/char/zcore.c | 88 |
1 files changed, 86 insertions, 2 deletions
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c index eefc6611412e..cfe782ee6473 100644 --- a/drivers/s390/char/zcore.c +++ b/drivers/s390/char/zcore.c @@ -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"); |