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path: root/drivers/s390/char/zcore.c
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Diffstat (limited to 'drivers/s390/char/zcore.c')
-rw-r--r--drivers/s390/char/zcore.c90
1 files changed, 88 insertions, 2 deletions
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index eefc6611412..1bbae433fbd 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
*/
@@ -24,6 +24,7 @@
#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)
@@ -48,12 +49,19 @@ 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 +535,33 @@ 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 +680,40 @@ 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 (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;
@@ -690,6 +759,10 @@ 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 +780,17 @@ 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 +804,15 @@ 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");