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-rw-r--r--arch/s390/include/asm/lowcore.h24
-rw-r--r--arch/s390/include/asm/system.h16
-rw-r--r--arch/s390/kernel/ipl.c56
-rw-r--r--arch/s390/kernel/setup.c5
-rw-r--r--arch/s390/kernel/smp.c9
-rw-r--r--drivers/s390/char/zcore.c88
6 files changed, 172 insertions, 26 deletions
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index f3720defdd16..ee4b10ff9387 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -111,7 +111,7 @@
#define __LC_PASTE 0xE40
-#define __LC_PANIC_MAGIC 0xE00
+#define __LC_DUMP_REIPL 0xE00
#ifndef __s390x__
#define __LC_PFAULT_INTPARM 0x080
#define __LC_CPU_TIMER_SAVE_AREA 0x0D8
@@ -286,12 +286,14 @@ struct _lowcore
__u64 int_clock; /* 0xc98 */
__u8 pad11[0xe00-0xca0]; /* 0xca0 */
- /* 0xe00 is used as indicator for dump tools */
- /* whether the kernel died with panic() or not */
- __u32 panic_magic; /* 0xe00 */
+ /* 0xe00 contains the address of the IPL Parameter */
+ /* Information block. Dump tools need IPIB for IPL */
+ /* after dump. */
+ __u32 ipib; /* 0xe00 */
+ __u32 ipib_checksum; /* 0xe04 */
/* Align to the top 1k of prefix area */
- __u8 pad12[0x1000-0xe04]; /* 0xe04 */
+ __u8 pad12[0x1000-0xe08]; /* 0xe08 */
#else /* !__s390x__ */
/* prefix area: defined by architecture */
__u32 ccw1[2]; /* 0x000 */
@@ -379,12 +381,14 @@ struct _lowcore
__u64 int_clock; /* 0xde8 */
__u8 pad12[0xe00-0xdf0]; /* 0xdf0 */
- /* 0xe00 is used as indicator for dump tools */
- /* whether the kernel died with panic() or not */
- __u32 panic_magic; /* 0xe00 */
+ /* 0xe00 contains the address of the IPL Parameter */
+ /* Information block. Dump tools need IPIB for IPL */
+ /* after dump. */
+ __u64 ipib; /* 0xe00 */
+ __u32 ipib_checksum; /* 0xe08 */
/* Per cpu primary space access list */
- __u8 pad_0xe04[0xe38-0xe04]; /* 0xe04 */
+ __u8 pad_0xe0c[0xe38-0xe0c]; /* 0xe0c */
__u64 vdso_per_cpu_data; /* 0xe38 */
__u32 paste[16]; /* 0xe40 */
@@ -433,8 +437,6 @@ static inline __u32 store_prefix(void)
return address;
}
-#define __PANIC_MAGIC 0xDEADC0DE
-
#endif
#endif
diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h
index 3a8b26eb1f2e..3f2ccb82b863 100644
--- a/arch/s390/include/asm/system.h
+++ b/arch/s390/include/asm/system.h
@@ -458,6 +458,22 @@ static inline unsigned short stap(void)
return cpu_address;
}
+static inline u32 cksm(void *addr, unsigned long len)
+{
+ register unsigned long _addr asm("0") = (unsigned long) addr;
+ register unsigned long _len asm("1") = len;
+ unsigned long accu = 0;
+
+ asm volatile(
+ "0:\n"
+ " cksm %0,%1\n"
+ " jnz 0b\n"
+ : "+d" (accu), "+d" (_addr), "+d" (_len)
+ :
+ : "cc", "memory");
+ return accu;
+}
+
extern void (*_machine_restart)(char *command);
extern void (*_machine_halt)(void);
extern void (*_machine_power_off)(void);
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 2dcf590faba6..5663c1f8e46a 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -56,13 +56,14 @@ struct shutdown_trigger {
};
/*
- * Five shutdown action types are supported:
+ * The following shutdown action types are supported:
*/
#define SHUTDOWN_ACTION_IPL_STR "ipl"
#define SHUTDOWN_ACTION_REIPL_STR "reipl"
#define SHUTDOWN_ACTION_DUMP_STR "dump"
#define SHUTDOWN_ACTION_VMCMD_STR "vmcmd"
#define SHUTDOWN_ACTION_STOP_STR "stop"
+#define SHUTDOWN_ACTION_DUMP_REIPL_STR "dump_reipl"
struct shutdown_action {
char *name;
@@ -146,6 +147,7 @@ static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
static struct ipl_parameter_block *reipl_block_fcp;
static struct ipl_parameter_block *reipl_block_ccw;
static struct ipl_parameter_block *reipl_block_nss;
+static struct ipl_parameter_block *reipl_block_actual;
static int dump_capabilities = DUMP_TYPE_NONE;
static enum dump_type dump_type = DUMP_TYPE_NONE;
@@ -835,6 +837,7 @@ static int reipl_set_type(enum ipl_type type)
reipl_method = REIPL_METHOD_CCW_VM;
else
reipl_method = REIPL_METHOD_CCW_CIO;
+ reipl_block_actual = reipl_block_ccw;
break;
case IPL_TYPE_FCP:
if (diag308_set_works)
@@ -843,6 +846,7 @@ static int reipl_set_type(enum ipl_type type)
reipl_method = REIPL_METHOD_FCP_RO_VM;
else
reipl_method = REIPL_METHOD_FCP_RO_DIAG;
+ reipl_block_actual = reipl_block_fcp;
break;
case IPL_TYPE_FCP_DUMP:
reipl_method = REIPL_METHOD_FCP_DUMP;
@@ -852,6 +856,7 @@ static int reipl_set_type(enum ipl_type type)
reipl_method = REIPL_METHOD_NSS_DIAG;
else
reipl_method = REIPL_METHOD_NSS;
+ reipl_block_actual = reipl_block_nss;
break;
case IPL_TYPE_UNKNOWN:
reipl_method = REIPL_METHOD_DEFAULT;
@@ -1332,6 +1337,48 @@ static struct shutdown_action __refdata dump_action = {
.init = dump_init,
};
+static void dump_reipl_run(struct shutdown_trigger *trigger)
+{
+ preempt_disable();
+ /*
+ * Bypass dynamic address translation (DAT) when storing IPL parameter
+ * information block address and checksum into the prefix area
+ * (corresponding to absolute addresses 0-8191).
+ * When enhanced DAT applies and the STE format control in one,
+ * the absolute address is formed without prefixing. In this case a
+ * normal store (stg/st) into the prefix area would no more match to
+ * absolute addresses 0-8191.
+ */
+#ifdef CONFIG_64BIT
+ asm volatile("sturg %0,%1"
+ :: "a" ((unsigned long) reipl_block_actual),
+ "a" (&lowcore_ptr[smp_processor_id()]->ipib));
+#else
+ asm volatile("stura %0,%1"
+ :: "a" ((unsigned long) reipl_block_actual),
+ "a" (&lowcore_ptr[smp_processor_id()]->ipib));
+#endif
+ asm volatile("stura %0,%1"
+ :: "a" (cksm(reipl_block_actual, reipl_block_actual->hdr.len)),
+ "a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));
+ preempt_enable();
+ dump_run(trigger);
+}
+
+static int __init dump_reipl_init(void)
+{
+ if (!diag308_set_works)
+ return -EOPNOTSUPP;
+ else
+ return 0;
+}
+
+static struct shutdown_action __refdata dump_reipl_action = {
+ .name = SHUTDOWN_ACTION_DUMP_REIPL_STR,
+ .fn = dump_reipl_run,
+ .init = dump_reipl_init,
+};
+
/*
* vmcmd shutdown action: Trigger vm command on shutdown.
*/
@@ -1421,7 +1468,8 @@ static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
/* action list */
static struct shutdown_action *shutdown_actions_list[] = {
- &ipl_action, &reipl_action, &dump_action, &vmcmd_action, &stop_action};
+ &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
+ &vmcmd_action, &stop_action};
#define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
/*
@@ -1434,11 +1482,11 @@ static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
size_t len)
{
int i;
+
for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
if (!shutdown_actions_list[i])
continue;
- if (strncmp(buf, shutdown_actions_list[i]->name,
- strlen(shutdown_actions_list[i]->name)) == 0) {
+ if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
trigger->action = shutdown_actions_list[i];
return len;
}
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index c5cfb6185eac..8fdf08379ce9 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -86,6 +86,10 @@ volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
int __initdata memory_end_set;
unsigned long __initdata memory_end;
+/* An array with a pointer to the lowcore of every CPU. */
+struct _lowcore *lowcore_ptr[NR_CPUS];
+EXPORT_SYMBOL(lowcore_ptr);
+
/*
* This is set up by the setup-routine at boot-time
* for S390 need to find out, what we have to setup
@@ -434,6 +438,7 @@ setup_lowcore(void)
lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
#endif
set_prefix((u32)(unsigned long) lc);
+ lowcore_ptr[0] = lc;
}
static void __init
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 2d337cbb9329..e279d0fbbbe8 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -50,12 +50,6 @@
#include <asm/vdso.h>
#include "entry.h"
-/*
- * An array with a pointer the lowcore of every CPU.
- */
-struct _lowcore *lowcore_ptr[NR_CPUS];
-EXPORT_SYMBOL(lowcore_ptr);
-
static struct task_struct *current_set[NR_CPUS];
static u8 smp_cpu_type;
@@ -82,9 +76,6 @@ void smp_send_stop(void)
/* Disable all interrupts/machine checks */
__load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
- /* write magic number to zero page (absolute 0) */
- lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
-
/* stop all processors */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
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");
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