[ANNOUNCE 1/7] Diskdump 1.0 Release

Takao Indoh
2004-11-29T10:41:40Z

This is a patch for diskdump common layer.

diff -Nur linux-2.6.9.org/arch/i386/kernel/nmi.c linux-2.6.9/arch/i386/kernel/nmi.c
--- linux-2.6.9.org/arch/i386/kernel/nmi.c 2004-10-19 06:54:31.000000000 +0900
+++ linux-2.6.9/arch/i386/kernel/nmi.c 2004-11-26 20:13:17.770808053 +0900
@@ -564,3 +564,4 @@
EXPORT_SYMBOL(release_lapic_nmi);
EXPORT_SYMBOL(disable_timer_nmi_watchdog);
EXPORT_SYMBOL(enable_timer_nmi_watchdog);
+EXPORT_SYMBOL_GPL(touch_nmi_watchdog);
diff -Nur linux-2.6.9.org/arch/i386/kernel/reboot.c linux-2.6.9/arch/i386/kernel/reboot.c
--- linux-2.6.9.org/arch/i386/kernel/reboot.c 2004-10-19 06:53:45.000000000 +0900
+++ linux-2.6.9/arch/i386/kernel/reboot.c 2004-11-26 20:13:17.770808053 +0900
@@ -330,7 +330,8 @@
* Stop all CPUs and turn off local APICs and the IO-APIC, so
* other OSs see a clean IRQ state.
*/
- smp_send_stop();
+ if (!crashdump_mode())
+ smp_send_stop();
#elif defined(CONFIG_X86_LOCAL_APIC)
if (cpu_has_apic) {
local_irq_disable();
diff -Nur linux-2.6.9.org/arch/i386/kernel/smp.c linux-2.6.9/arch/i386/kernel/smp.c
--- linux-2.6.9.org/arch/i386/kernel/smp.c 2004-10-19 06:53:12.000000000 +0900
+++ linux-2.6.9/arch/i386/kernel/smp.c 2004-11-26 20:14:15.497369846 +0900
@@ -520,7 +520,7 @@
return 0;

/* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
+ WARN_ON(irqs_disabled() && !crashdump_mode());

data.func = func;
data.info = info;
diff -Nur linux-2.6.9.org/arch/i386/kernel/traps.c linux-2.6.9/arch/i386/kernel/traps.c
--- linux-2.6.9.org/arch/i386/kernel/traps.c 2004-10-19 06:53:23.000000000 +0900
+++ linux-2.6.9/arch/i386/kernel/traps.c 2004-11-26 20:13:17.771784616 +0900
@@ -349,6 +349,7 @@
printk("\n");
notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
show_registers(regs);
+ try_crashdump(regs);
} else
printk(KERN_ERR "Recursive die() failure, output suppressed\n");

diff -Nur linux-2.6.9.org/arch/i386/mm/init.c linux-2.6.9/arch/i386/mm/init.c
--- linux-2.6.9.org/arch/i386/mm/init.c 2004-10-19 06:54:54.000000000 +0900
+++ linux-2.6.9/arch/i386/mm/init.c 2004-11-26 20:13:17.771784616 +0900
@@ -187,6 +187,53 @@

extern int is_available_memory(efi_memory_desc_t *);

+unsigned long next_ram_page(unsigned long pagenr)
+{
+ int i;
+ unsigned long addr, end;
+ unsigned long min_pageno = ULONG_MAX;
+
+ pagenr++;
+
+ if (efi_enabled) {
+ efi_memory_desc_t *md;
+
+ for (i = 0; i < memmap.nr_map; i++) {
+ md = &memmap.map[i];
+ if (!is_available_memory(md))
+ continue;
+ addr = (md->phys_addr+PAGE_SIZE-1) >> PAGE_SHIFT;
+ end = (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >> PAGE_SHIFT;
+
+ if ((pagenr >= addr) && (pagenr < end))
+ return pagenr;
+ if ((pagenr < addr) && (addr < min_pageno))
+ min_pageno = addr;
+ }
+ return min_pageno;
+ }
+
+ for (i = 0; i < e820.nr_map; i++) {
+
+ if (e820.map[i].type != E820_RAM) /* not usable memory */
+ continue;
+ /*
+ * !!!FIXME!!! Some BIOSen report areas as RAM that
+ * are not. Notably the 640->1Mb area. We need a sanity
+ * check here.
+ */
+ addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
+ end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
+ if ((pagenr >= addr) && (pagenr < end))
+ return pagenr;
+ if ((pagenr < addr) && (addr < min_pageno))
+ min_pageno = addr;
+ }
+ return min_pageno;
+}
+
+EXPORT_SYMBOL_GPL(next_ram_page);
+
static inline int page_is_ram(unsigned long pagenr)
{
int i;
@@ -225,6 +272,8 @@
return 0;
}

+EXPORT_SYMBOL_GPL(page_is_ram);
+
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;
diff -Nur linux-2.6.9.org/arch/ia64/kernel/process.c linux-2.6.9/arch/ia64/kernel/process.c
--- linux-2.6.9.org/arch/ia64/kernel/process.c 2004-10-19 06:54:08.000000000 +0900
+++ linux-2.6.9/arch/ia64/kernel/process.c 2004-11-26 20:13:17.772761178 +0900
@@ -38,6 +38,7 @@
#include <asm/uaccess.h>
#include <asm/unwind.h>
#include <asm/user.h>
+#include <asm/diskdump.h>

#ifdef CONFIG_PERFMON
# include <asm/perfmon.h>
@@ -555,11 +556,13 @@
}

void
-do_copy_regs (struct unw_frame_info *info, void *arg)
+ia64_do_copy_regs (struct unw_frame_info *info, void *arg)
{
do_copy_task_regs(current, info, arg);
}

+EXPORT_SYMBOL_GPL(ia64_do_copy_regs);
+
void
do_dump_fpu (struct unw_frame_info *info, void *arg)
{
@@ -572,7 +575,7 @@
struct unw_frame_info tcore_info;

if (current == task) {
- unw_init_running(do_copy_regs, regs);
+ unw_init_running(ia64_do_copy_regs, regs);
} else {
memset(&tcore_info, 0, sizeof(tcore_info));
unw_init_from_blocked_task(&tcore_info, task);
@@ -584,7 +587,7 @@
void
ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
{
- unw_init_running(do_copy_regs, dst);
+ unw_init_running(ia64_do_copy_regs, dst);
}

int
@@ -775,3 +778,22 @@
}

EXPORT_SYMBOL(machine_power_off);
+
+void
+ia64_freeze_cpu (struct unw_frame_info *info, void *arg)
+{
+ current->thread.ksp = (__u64)(info->sw) - 16;
+ for (;;) local_irq_disable();
+}
+
+EXPORT_SYMBOL_GPL(ia64_freeze_cpu);
+
+void
+ia64_start_dump (struct unw_frame_info *info, void *arg)
+{
+ struct dump_call_param *param = arg;
+
+ param->func(param->regs, info);
+}
+
+EXPORT_SYMBOL_GPL(ia64_start_dump);
diff -Nur linux-2.6.9.org/arch/ia64/kernel/smp.c linux-2.6.9/arch/ia64/kernel/smp.c
--- linux-2.6.9.org/arch/ia64/kernel/smp.c 2004-10-19 06:55:29.000000000 +0900
+++ linux-2.6.9/arch/ia64/kernel/smp.c 2004-11-26 20:14:45.477838229 +0900
@@ -332,7 +332,7 @@
return 0;

/* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
+ WARN_ON(irqs_disabled() && !crashdump_mode());

data.func = func;
data.info = info;
diff -Nur linux-2.6.9.org/arch/ia64/kernel/traps.c linux-2.6.9/arch/ia64/kernel/traps.c
--- linux-2.6.9.org/arch/ia64/kernel/traps.c 2004-10-19 06:55:28.000000000 +0900
+++ linux-2.6.9/arch/ia64/kernel/traps.c 2004-11-26 20:13:17.773737741 +0900
@@ -92,6 +92,7 @@
} else
printk(KERN_ERR "Recursive die() failure, output suppressed\n");

+ try_crashdump(regs);
bust_spinlocks(0);
die.lock_owner = -1;
spin_unlock_irq(&die.lock);
diff -Nur linux-2.6.9.org/arch/ia64/mm/init.c linux-2.6.9/arch/ia64/mm/init.c
--- linux-2.6.9.org/arch/ia64/mm/init.c 2004-10-19 06:53:51.000000000 +0900
+++ linux-2.6.9/arch/ia64/mm/init.c 2004-11-26 20:13:17.773737741 +0900
@@ -254,6 +254,94 @@
return page;
}

+struct curr_mem_request {
+ unsigned long requested;
+ unsigned long min_physaddr;
+ int found;
+};
+
+/*
++ * Check whether a physical address fits within the memory descriptor
++ * block sent from efi_mmap_walk(). If it fits, set found.
++ */
+static int
+verify_physaddr (unsigned long start, unsigned long end, void *arg)
+{
+ struct curr_mem_request *cr = arg;
+
+ start = __pa(start);
+ end = __pa(end);
+
+ if ((cr->requested >= start) && (cr->requested + PAGE_SIZE) <= end) {
+ cr->found = 1;
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * If physical page 'nr' is valid RAM then return 1. Otherwise return 0.
+ */
+int
+page_is_ram (unsigned long pagenr)
+{
+ struct curr_mem_request cr;
+
+ if (!pfn_valid(pagenr))
+ return 0;
+
+ cr.requested = pagenr << PAGE_SHIFT;
+ cr.found = 0;
+
+ efi_memmap_walk(verify_physaddr, &cr);
+
+ return cr.found;
+}
+EXPORT_SYMBOL_GPL(page_is_ram);
+
+static int
+find_next (unsigned long start, unsigned long end, void *arg)
+{
+ struct curr_mem_request *cr = (struct curr_mem_request *)arg;
+
+ start = __pa(start);
+ end = __pa(end);
+
+ if ((cr->requested >= start) && (cr->requested + PAGE_SIZE) <= end) {
+ cr->min_physaddr = cr->requested;
+ cr->found = 1;
+ return -1;
+ }
+ if ((cr->requested < start) && (start + PAGE_SIZE) <= end)
+ if (start < cr->min_physaddr) {
+ cr->min_physaddr = start;
+ cr->found = 1;
+ }
+
+ return 0;
+}
+
+unsigned long
+next_ram_page (unsigned long pagenr)
+{
+ struct curr_mem_request cr;
+
+ pagenr++;
+
+ cr.requested = pagenr << PAGE_SHIFT;
+ cr.found = 0;
+ cr.min_physaddr = ULONG_MAX;
+
+ efi_memmap_walk(find_next, &cr);
+
+ if (cr.found)
+ return cr.min_physaddr >> PAGE_SHIFT;
+ else
+ return ULONG_MAX;
+}
+EXPORT_SYMBOL_GPL(next_ram_page);
+
static void
setup_gate (void)
{
diff -Nur linux-2.6.9.org/arch/ppc64/kernel/smp.c linux-2.6.9/arch/ppc64/kernel/smp.c
--- linux-2.6.9.org/arch/ppc64/kernel/smp.c 2004-10-19 06:54:40.000000000 +0900
+++ linux-2.6.9/arch/ppc64/kernel/smp.c 2004-11-26 20:17:51.303031265 +0900
@@ -684,7 +684,7 @@
unsigned long timeout;

/* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
+ WARN_ON(irqs_disabled() && !crashdump_mode());

data.func = func;
data.info = info;
diff -Nur linux-2.6.9.org/arch/ppc64/kernel/traps.c linux-2.6.9/arch/ppc64/kernel/traps.c
--- linux-2.6.9.org/arch/ppc64/kernel/traps.c 2004-10-19 06:54:19.000000000 +0900
+++ linux-2.6.9/arch/ppc64/kernel/traps.c 2004-11-26 20:13:17.774714303 +0900
@@ -116,6 +116,7 @@
if (nl)
printk("\n");
show_regs(regs);
+ try_crashdump(regs);
bust_spinlocks(0);
spin_unlock_irq(&die_lock);

diff -Nur linux-2.6.9.org/arch/ppc64/mm/init.c linux-2.6.9/arch/ppc64/mm/init.c
--- linux-2.6.9.org/arch/ppc64/mm/init.c 2004-10-19 06:54:32.000000000 +0900
+++ linux-2.6.9/arch/ppc64/mm/init.c 2004-11-26 20:13:17.774714303 +0900
@@ -593,6 +593,34 @@
}
EXPORT_SYMBOL(page_is_ram);

+unsigned long next_ram_page(unsigned long pfn)
+{
+ int i;
+ unsigned long paddr, base;
+ unsigned long best_base = (ULONG_MAX << PAGE_SHIFT);
+
+ pfn++;
+ paddr = (pfn << PAGE_SHIFT);
+
+ for (i=0; i < lmb.memory.cnt; i++) {
+#ifdef CONFIG_MSCHUNKS
+ base = lmb.memory.region[i].physbase;
+#else
+ base = lmb.memory.region[i].base;
+#endif
+ if ((paddr >= base)
+ && (paddr < (base + lmb.memory.region[i].size)))
+ return (paddr >> PAGE_SHIFT);
+ if ((paddr < base) && (base < best_base))
+ best_base = base;
+ }
+ if (best_base < (ULONG_MAX << PAGE_SHIFT))
+ return (best_base >> PAGE_SHIFT);
+ else
+ return ULONG_MAX;
+}
+EXPORT_SYMBOL_GPL(next_ram_page);
+
/*
* Initialize the bootmem system and give it all the memory we
* have available.
diff -Nur linux-2.6.9.org/arch/x86_64/kernel/reboot.c linux-2.6.9/arch/x86_64/kernel/reboot.c
--- linux-2.6.9.org/arch/x86_64/kernel/reboot.c 2004-10-19 06:54:55.000000000 +0900
+++ linux-2.6.9/arch/x86_64/kernel/reboot.c 2004-11-26 20:13:17.774714303 +0900
@@ -130,7 +130,8 @@
int i;

#ifdef CONFIG_SMP
- smp_halt();
+ if (!crashdump_mode())
+ smp_halt();
#endif

local_irq_disable();
@@ -141,7 +142,8 @@

disable_IO_APIC();

- local_irq_enable();
+ if (!crashdump_mode())
+ local_irq_enable();

/* Tell the BIOS if we want cold or warm reboot */
*((unsigned short *)__va(0x472)) = reboot_mode;
diff -Nur linux-2.6.9.org/arch/x86_64/kernel/traps.c linux-2.6.9/arch/x86_64/kernel/traps.c
--- linux-2.6.9.org/arch/x86_64/kernel/traps.c 2004-10-19 06:53:06.000000000 +0900
+++ linux-2.6.9/arch/x86_64/kernel/traps.c 2004-11-26 20:13:17.775690866 +0900
@@ -367,6 +367,7 @@
oops_begin();
handle_BUG(regs);
__die(str, regs, err);
+ try_crashdump(regs);
oops_end();
do_exit(SIGSEGV);
}
diff -Nur linux-2.6.9.org/arch/x86_64/mm/fault.c linux-2.6.9/arch/x86_64/mm/fault.c
--- linux-2.6.9.org/arch/x86_64/mm/fault.c 2004-10-19 06:53:06.000000000 +0900
+++ linux-2.6.9/arch/x86_64/mm/fault.c 2004-11-26 20:13:17.775690866 +0900
@@ -484,6 +484,7 @@
__die("Oops", regs, error_code);
/* Executive summary in case the body of the oops scrolled away */
printk(KERN_EMERG "CR2: %016lx\n", address);
+ try_crashdump(regs);
oops_end();
do_exit(SIGKILL);

diff -Nur linux-2.6.9.org/arch/x86_64/mm/init.c linux-2.6.9/arch/x86_64/mm/init.c
--- linux-2.6.9.org/arch/x86_64/mm/init.c 2004-10-19 06:53:43.000000000 +0900
+++ linux-2.6.9/arch/x86_64/mm/init.c 2004-11-26 20:13:17.776667428 +0900
@@ -22,6 +22,7 @@
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
+#include <linux/module.h>

#include <asm/processor.h>
#include <asm/system.h>
@@ -378,6 +379,35 @@
__flush_tlb_all();
}

+unsigned long next_ram_page (unsigned long pagenr)
+{
+ int i;
+ unsigned long min_pageno = ULONG_MAX;
+
+ pagenr++;
+
+ for (i = 0; i < e820.nr_map; i++) {
+ unsigned long addr, end;
+
+ if (e820.map[i].type != E820_RAM) /* not usable memory */
+ continue;
+ /*
+ * !!!FIXME!!! Some BIOSen report areas as RAM that
+ * are not. Notably the 640->1Mb area. We need a sanity
+ * check here.
+ */
+ addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
+ end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
+ if ((pagenr >= addr) && (pagenr < end))
+ return pagenr;
+ if ((pagenr < addr) && (addr < min_pageno))
+ min_pageno = addr;
+ }
+ return min_pageno;
+}
+
+EXPORT_SYMBOL_GPL(next_ram_page);
+
static inline int page_is_ram (unsigned long pagenr)
{
int i;
@@ -400,6 +430,8 @@
return 0;
}

+EXPORT_SYMBOL_GPL(page_is_ram);
+
extern int swiotlb_force;

static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
@@ -557,6 +589,7 @@
return 0;
return pfn_valid(pte_pfn(*pte));
}
+EXPORT_SYMBOL_GPL(kern_addr_valid);

#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
diff -Nur linux-2.6.9.org/drivers/block/Kconfig linux-2.6.9/drivers/block/Kconfig
--- linux-2.6.9.org/drivers/block/Kconfig 2004-10-19 06:53:43.000000000 +0900
+++ linux-2.6.9/drivers/block/Kconfig 2004-11-26 20:13:17.776667428 +0900
@@ -356,6 +356,12 @@
your machine, or if you want to have a raid or loopback device
bigger than 2TB. Otherwise say N.

+config DISKDUMP
+ tristate "Disk dump support"
+ depends on MODULES && m
+ ---help---
+ Disk dump support.
+
source "drivers/s390/block/Kconfig"

endmenu
diff -Nur linux-2.6.9.org/drivers/block/Makefile linux-2.6.9/drivers/block/Makefile
--- linux-2.6.9.org/drivers/block/Makefile 2004-10-19 06:54:55.000000000 +0900
+++ linux-2.6.9/drivers/block/Makefile 2004-11-26 20:13:17.777643991 +0900
@@ -44,3 +44,4 @@
obj-$(CONFIG_BLK_DEV_SX8) += sx8.o
obj-$(CONFIG_BLK_DEV_UB) += ub.o

+obj-$(CONFIG_DISKDUMP) += diskdump.o
diff -Nur linux-2.6.9.org/drivers/block/diskdump.c linux-2.6.9/drivers/block/diskdump.c
--- linux-2.6.9.org/drivers/block/diskdump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/drivers/block/diskdump.c 2004-11-26 20:13:17.780573678 +0900
@@ -0,0 +1,1123 @@
+/*
+ * linux/drivers/block/diskdump.c
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Copyright (C) 2002 Red Hat, Inc.
+ * Written by Nobuhiro Tachino (ntachino@jp.fujitsu.com)
+ *
+ * Some codes were derived from netdump and copyright belongs to
+ * Red Hat, Inc.
+ */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/highmem.h>
+#include <linux/smp_lock.h>
+#include <linux/nmi.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/diskdump.h>
+#include <asm/diskdump.h>
+
+#define Dbg(x, ...) pr_debug("disk_dump: " x "\n", ## __VA_ARGS__)
+#define Err(x, ...) pr_err ("disk_dump: " x "\n", ## __VA_ARGS__)
+#define Warn(x, ...) pr_warn ("disk_dump: " x "\n", ## __VA_ARGS__)
+#define Info(x, ...) pr_info ("disk_dump: " x "\n", ## __VA_ARGS__)
+
+#define ROUNDUP(x, y) (((x) + ((y)-1))/(y))
+
+/* 512byte sectors to blocks */
+#define SECTOR_BLOCK(s) ((s) >> (DUMP_BLOCK_SHIFT - 9))
+
+/* The number of block which is used for saving format information */
+#define USER_PARAM_BLOCK 2
+
+static int fallback_on_err = 1;
+static int allow_risky_dumps = 1;
+static unsigned int block_order = 2;
+static int sample_rate = 8;
+module_param_named(fallback_on_err, fallback_on_err, bool, S_IRUGO|S_IWUSR);
+module_param_named(allow_risky_dumps, allow_risky_dumps, bool, S_IRUGO|S_IWUSR);
+module_param_named(block_order, block_order, uint, S_IRUGO|S_IWUSR);
+module_param_named(sample_rate, sample_rate, int, S_IRUGO|S_IWUSR);
+
+static unsigned long timestamp_1sec;
+static uint32_t module_crc;
+static char *scratch;
+static struct disk_dump_header dump_header;
+static struct disk_dump_sub_header dump_sub_header;
+
+/* Registered dump devices */
+static LIST_HEAD(disk_dump_devices);
+
+/* Registered dump types, e.g. SCSI, ... */
+static LIST_HEAD(disk_dump_types);
+
+static DECLARE_MUTEX(disk_dump_mutex);
+
+static unsigned int header_blocks; /* The size of all headers */
+static unsigned int bitmap_blocks; /* The size of bitmap header */
+static unsigned int total_ram_blocks; /* The size of memory */
+static unsigned int total_blocks; /* The sum of above */
+/*
+ * This is not a parameter actually, but used to pass the number of
+ * required blocks to userland tools
+ */
+module_param_named(total_blocks, total_blocks, uint, S_IRUGO);
+
+struct notifier_block *disk_dump_notifier_list;
+EXPORT_SYMBOL_GPL(disk_dump_notifier_list);
+
+unsigned long volatile diskdump_base_jiffies;
+void *diskdump_stack;
+enum disk_dump_states disk_dump_state = DISK_DUMP_INITIAL;
+
+extern int panic_timeout;
+extern unsigned long max_pfn;
+
+static asmlinkage void disk_dump(struct pt_regs *, void *);
+
+
+#if CONFIG_SMP
+static void freeze_cpu(void *dummy)
+{
+ unsigned int cpu = smp_processor_id();
+
+ dump_header.tasks[cpu] = current;
+
+ platform_freeze_cpu();
+}
+#endif
+
+static int lapse = 0; /* 200msec unit */
+
+static inline unsigned long eta(unsigned long nr, unsigned long maxnr)
+{
+ unsigned long long eta;
+
+ if (nr == 0)
+ nr = 1;
+
+ eta = ((maxnr << 8) / nr) * (unsigned long long)lapse;
+
+ return (unsigned long)(eta >> 8) - lapse;
+}
+
+static inline void print_status(unsigned int nr, unsigned int maxnr)
+{
+ static char *spinner = "/|\\-";
+ static unsigned long long prev_timestamp = 0;
+ unsigned long long timestamp;
+
+ if (nr == 0)
+ nr++;
+
+ platform_timestamp(timestamp);
+
+ if (timestamp - prev_timestamp > (timestamp_1sec/5)) {
+ prev_timestamp = timestamp;
+ lapse++;
+ printk("%u/%u %lu ETA %c \r",
+ nr, maxnr, eta(nr, maxnr) / 5, spinner[lapse & 3]);
+ }
+}
+
+static inline void clear_status(int nr, int maxnr)
+{
+ printk(" \r");
+ lapse = 0;
+}
+
+/*
+ * Checking the signature on a block. The format is as follows.
+ *
+ * 1st word = 'disk'
+ * 2nd word = 'dump'
+ * 3rd word = block number
+ * 4th word = ((block number + 7) * 11) & 0xffffffff
+ * 5th word = ((4th word + 7)* 11) & 0xffffffff
+ * ..
+ *
+ * Return 1 if the signature is correct, else return 0
+ */
+static int check_block_signature(void *buf, unsigned int block_nr)
+{
+ int word_nr = PAGE_SIZE / sizeof(int);
+ int *words = buf;
+ unsigned int val;
+ int i;
+
+ /*
+ * Block 2 is used for the area which formatter saves options like
+ * the sampling rate or the number of blocks. the Kernel part does not
+ * check this block.
+ */
+ if (block_nr == USER_PARAM_BLOCK)
+ return 1;
+
+ if (memcmp(buf, DUMP_PARTITION_SIGNATURE, sizeof(*words)))
+ return 0;
+
+ val = block_nr;
+ for (i = 2; i < word_nr; i++) {
+ if (words[i] != val)
+ return 0;
+ val = (val + 7) * 11;
+ }
+
+ return 1;
+}
+
+/*
+ * Read one block into the dump partition
+ */
+static int read_blocks(struct disk_dump_partition *dump_part, unsigned int nr,
+ char *buf, int len)
+{
+ struct disk_dump_device *device = dump_part->device;
+ int ret;
+
+ local_irq_disable();
+ touch_nmi_watchdog();
+ ret = device->ops.rw_block(dump_part, READ, nr, buf, len);
+ if (ret < 0) {
+ Err("read error on block %u", nr);
+ return ret;
+ }
+ return 0;
+}
+
+static int write_blocks(struct disk_dump_partition *dump_part, unsigned int offs, char *buf, int len)
+{
+ struct disk_dump_device *device = dump_part->device;
+ int ret;
+
+ local_irq_disable();
+ touch_nmi_watchdog();
+ ret = device->ops.rw_block(dump_part, WRITE, offs, buf, len);
+ if (ret < 0) {
+ Err("write error on block %u", offs);
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Initialize the common header
+ */
+
+/*
+ * Write the common header
+ */
+static int write_header(struct disk_dump_partition *dump_part)
+{
+ memset(scratch, 0, PAGE_SIZE);
+ memcpy(scratch, &dump_header, sizeof(dump_header));
+
+ return write_blocks(dump_part, 1, scratch, 1);
+}
+
+/*
+ * Check the signaures in all blocks of the dump partition
+ * Return 1 if the signature is correct, else return 0
+ */
+static int check_dump_partition(struct disk_dump_partition *dump_part,
+ unsigned int partition_size)
+{
+ unsigned int blk;
+ int ret;
+ unsigned int chunk_blks, skips;
+ int i;
+
+ if (sample_rate < 0) /* No check */
+ return 1;
+
+ /*
+ * If the device has limitations of transfer size, use it.
+ */
+ chunk_blks = 1 << block_order;
+ if (dump_part->device->max_blocks)
+ chunk_blks = min(chunk_blks, dump_part->device->max_blocks);
+ skips = chunk_blks << sample_rate;
+
+ lapse = 0;
+ for (blk = 0; blk < partition_size; blk += skips) {
+ unsigned int len;
+redo:
+ len = min(chunk_blks, partition_size - blk);
+ if ((ret = read_blocks(dump_part, blk, scratch, len)) < 0)
+ return 0;
+ print_status(blk + 1, partition_size);
+ for (i = 0; i < len; i++)
+ if (!check_block_signature(scratch + i * DUMP_BLOCK_SIZE, blk + i)) {
+ Err("bad signature in block %u", blk + i);
+ return 0;
+ }
+ }
+ /* Check the end of the dump partition */
+ if (blk - skips + chunk_blks < partition_size) {
+ blk = partition_size - chunk_blks;
+ goto redo;
+ }
+ clear_status(blk, partition_size);
+ return 1;
+}
+
+/*
+ * Write memory bitmap after location of dump headers.
+ */
+#define PAGE_PER_BLOCK (PAGE_SIZE * 8)
+#define idx_to_pfn(nr, byte, bit) (((nr) * PAGE_SIZE + (byte)) * 8 + (bit))
+
+static int write_bitmap(struct disk_dump_partition *dump_part,
+ unsigned int bitmap_offset, unsigned int bitmap_blocks)
+{
+ unsigned int nr;
+ unsigned long pfn, next_ram_pfn;
+ int bit, byte;
+ int ret = 0;
+ unsigned char val;
+
+ for (nr = 0; nr < bitmap_blocks; nr++) {
+ pfn = idx_to_pfn(nr, 0, 0);
+ next_ram_pfn = next_ram_page(pfn - 1);
+
+ if (pfn + PAGE_PER_BLOCK <= next_ram_pfn)
+ memset(scratch, 0, PAGE_SIZE);
+ else
+ for (byte = 0; byte < PAGE_SIZE; byte++) {
+ val = 0;
+ for (bit = 0; bit < 8; bit++)
+ if (page_is_ram(idx_to_pfn(nr, byte,
+ bit)))
+ val |= (1 << bit);
+ scratch[byte] = (char)val;
+ }
+ if ((ret = write_blocks(dump_part, bitmap_offset + nr,
+ scratch, 1)) < 0) {
+ Err("I/O error %d on block %u", ret, bitmap_offset + nr);
+ break;
+ }
+ }
+ return ret;
+}
+
+/*
+ * Write whole memory to dump partition.
+ * Return value is the number of writen blocks.
+ */
+static int write_memory(struct disk_dump_partition *dump_part, int offset,
+ unsigned int max_blocks_written,
+ unsigned int *blocks_written)
+{
+ char *kaddr;
+ unsigned int blocks = 0;
+ struct page *page;
+ unsigned long nr;
+ int ret = 0;
+ int blk_in_chunk = 0;
+
+ for (nr = next_ram_page(ULONG_MAX); nr < max_pfn; nr = next_ram_page(nr)) {
+ print_status(blocks, max_blocks_written);
+
+
+ if (blocks >= max_blocks_written) {
+ Warn("dump device is too small. %lu pages were not saved", max_pfn - blocks);
+ goto out;
+ }
+
+ page = pfn_to_page(nr);
+ if (nr != page_to_pfn(page)) {
+ /* page_to_pfn() is called from kmap_atomic().
+ * If page->flag is broken, it specified a wrong
+ * zone and it causes kmap_atomic() fail.
+ */
+ Err("Bad page. PFN %lu flags %lx\n",
+ nr, (unsigned long)page->flags);
+ memset(scratch + blk_in_chunk * PAGE_SIZE, 0,
+ PAGE_SIZE);
+ sprintf(scratch + blk_in_chunk * PAGE_SIZE,
+ "Bad page. PFN %lu flags %lx\n",
+ nr, (unsigned long)page->flags);
+ goto write;
+ }
+
+ if (!kern_addr_valid((unsigned long)pfn_to_kaddr(nr))) {
+ memset(scratch + blk_in_chunk * PAGE_SIZE, 0,
+ PAGE_SIZE);
+ sprintf(scratch + blk_in_chunk * PAGE_SIZE,
+ "Unmapped page. PFN %lu\n", nr);
+ goto write;
+ }
+
+ kaddr = kmap_atomic(page, KM_CRASHDUMP);
+ /*
+ * need to copy because adapter drivers use
+ * virt_to_bus()
+ */
+ memcpy(scratch + blk_in_chunk * PAGE_SIZE, kaddr, PAGE_SIZE);
+ kunmap_atomic(kaddr, KM_CRASHDUMP);
+
+write:
+ blk_in_chunk++;
+ blocks++;
+
+ if (blk_in_chunk >= (1 << block_order)) {
+ ret = write_blocks(dump_part, offset, scratch,
+ blk_in_chunk);
+ if (ret < 0) {
+ Err("I/O error %d on block %u", ret, offset);
+ break;
+ }
+ offset += blk_in_chunk;
+ blk_in_chunk = 0;
+ }
+ }
+ if (ret >= 0 && blk_in_chunk > 0) {
+ ret = write_blocks(dump_part, offset, scratch, blk_in_chunk);
+ if (ret < 0)
+ Err("I/O error %d on block %u", ret, offset);
+ }
+
+out:
+ clear_status(nr, max_blocks_written);
+
+ *blocks_written = blocks;
+ return ret;
+}
+
+/*
+ * Select most suitable dump device. sanity_check() returns the state
+ * of each dump device. 0 means OK, negative value means NG, and
+ * positive value means it maybe work. select_dump_partition() first
+ * try to select a sane device and if it has no sane device and
+ * allow_risky_dumps is set, it select one from maybe OK devices.
+ *
+ * XXX We cannot handle multiple partitions yet.
+ */
+static struct disk_dump_partition *select_dump_partition(void)
+{
+ struct disk_dump_device *dump_device;
+ struct disk_dump_partition *dump_part;
+ int sanity;
+ int strict_check = 1;
+
+redo:
+ /*
+ * Select a sane polling driver.
+ */
+ list_for_each_entry(dump_device, &disk_dump_devices, list) {
+ sanity = 0;
+ if (dump_device->ops.sanity_check)
+ sanity = dump_device->ops.sanity_check(dump_device);
+ if (sanity < 0 || (sanity > 0 && strict_check))
+ continue;
+ list_for_each_entry(dump_part, &dump_device->partitions, list)
+ return dump_part;
+ }
+ if (allow_risky_dumps && strict_check) {
+ strict_check = 0;
+ goto redo;
+ }
+ return NULL;
+}
+
+static int dump_err = 0; /* Indicate Error state which occured in
+ * disk_dump(). We need to make it global
+ * because disk_dump() can't pass
+ * error state as return value.
+ */
+
+static void freeze_other_cpus(void)
+{
+#if CONFIG_SMP
+ int i;
+
+ smp_call_function(freeze_cpu, NULL, 1, 0);
+ diskdump_mdelay(3000);
+ printk("CPU frozen: ");
+ for (i = 0; i < NR_CPUS; i++) {
+ if (dump_header.tasks[i] != NULL)
+ printk("#%d", i);
+
+ }
+ printk("\n");
+ printk("CPU#%d is executing diskdump.\n", smp_processor_id());
+#else
+ diskdump_mdelay(1000);
+#endif
+ dump_header.tasks[smp_processor_id()] = current;
+}
+
+static void start_disk_dump(struct pt_regs *regs)
+{
+ unsigned long flags;
+
+ /* Inhibit interrupt and stop other CPUs */
+ local_irq_save(flags);
+ preempt_disable();
+
+ /*
+ * Check the checksum of myself
+ */
+ if (down_trylock(&disk_dump_mutex)) {
+ Err("down_trylock(disk_dump_mutex) failed.");
+ goto done;
+ }
+
+ if (!check_crc_module()) {
+ Err("checksum error. diskdump common module may be compromised.");
+ goto done;
+ }
+
+ disk_dump_state = DISK_DUMP_RUNNING;
+
+ diskdump_mode = 1;
+
+ Dbg("notify dump start.");
+ notifier_call_chain(&disk_dump_notifier_list, 0, NULL);
+
+ touch_nmi_watchdog();
+ freeze_other_cpus();
+
+ /*
+ * Some platforms may want to execute netdump on its own stack.
+ */
+ platform_start_crashdump(diskdump_stack, disk_dump, regs);
+
+done:
+ /*
+ * If diskdump failed and fallback_on_err is set,
+ * We just return and leave panic to netdump.
+ */
+ if (dump_err) {
+ Info("dump failed with error");
+ disk_dump_state = DISK_DUMP_FAILURE;
+ if (fallback_on_err && dump_err)
+ return;
+ } else {
+ Info("dump succeeded");
+ disk_dump_state = DISK_DUMP_SUCCESS;
+ }
+
+ Dbg("notify panic.");
+ notifier_call_chain(&panic_notifier_list, 0, NULL);
+
+ if (panic_timeout > 0) {
+ int i;
+ /*
+ * Delay timeout seconds before rebooting the machine.
+ * We can't use the "normal" timers since we just panicked..
+ */
+ printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
+ for (i = 0; i < panic_timeout; i++) {
+ touch_nmi_watchdog();
+ diskdump_mdelay(1000);
+ }
+
+ /*
+ * Should we run the reboot notifier. For the moment Im
+ * choosing not too. It might crash, be corrupt or do
+ * more harm than good for other reasons.
+ */
+ machine_restart(NULL);
+ }
+ printk(KERN_EMERG "halt\n");
+ for (;;) {
+ touch_nmi_watchdog();
+ machine_halt();
+ diskdump_mdelay(1000);
+ }
+}
+
+static asmlinkage void disk_dump(struct pt_regs *regs, void *platform_arg)
+{
+ struct pt_regs myregs;
+ unsigned int max_written_blocks, written_blocks;
+ struct disk_dump_device *dump_device = NULL;
+ struct disk_dump_partition *dump_part = NULL;
+ int ret;
+
+ dump_err = -EIO;
+
+ /*
+ * Setup timer/tasklet
+ */
+ dump_clear_timers();
+ dump_clear_tasklet();
+ dump_clear_workqueue();
+
+ /* Save original jiffies value */
+ diskdump_base_jiffies = jiffies;
+
+ diskdump_setup_timestamp();
+
+ platform_fix_regs();
+
+ if (list_empty(&disk_dump_devices)) {
+ Err("adapter driver is not registered.");
+ goto done;
+ }
+
+ printk("start dumping\n");
+
+ if (!(dump_part = select_dump_partition())) {
+ Err("No sane dump device found");
+ goto done;
+ }
+ dump_device = dump_part->device;
+
+ /*
+ * Stop ongoing I/O with polling driver and make the shift to I/O mode
+ * for dump
+ */
+ Dbg("do quiesce");
+ if (dump_device->ops.quiesce)
+ if ((ret = dump_device->ops.quiesce(dump_device)) < 0) {
+ Err("quiesce failed. error %d", ret);
+ goto done;
+ }
+
+ if (SECTOR_BLOCK(dump_part->nr_sects) < header_blocks + bitmap_blocks) {
+ Warn("dump partition is too small. Aborted");
+ goto done;
+ }
+
+ /* Check dump partition */
+ printk("check dump partition...\n");
+ if (!check_dump_partition(dump_part, total_blocks)) {
+ Err("check partition failed.");
+ goto done;
+ }
+
+ /*
+ * Write the common header
+ */
+ memcpy(dump_header.signature, DISK_DUMP_SIGNATURE,
+ sizeof(dump_header.signature));
+ dump_header.utsname = system_utsname;
+ dump_header.timestamp = xtime;
+ dump_header.status = DUMP_HEADER_INCOMPLETED;
+ dump_header.block_size = PAGE_SIZE;
+ dump_header.sub_hdr_size = size_of_sub_header();
+ dump_header.bitmap_blocks = bitmap_blocks;
+ dump_header.max_mapnr = max_pfn;
+ dump_header.total_ram_blocks = total_ram_blocks;
+ dump_header.device_blocks = SECTOR_BLOCK(dump_part->nr_sects);
+ dump_header.current_cpu = smp_processor_id();
+ dump_header.nr_cpus = num_online_cpus();
+ dump_header.written_blocks = 2;
+
+ write_header(dump_part);
+
+ /*
+ * Write the architecture dependent header
+ */
+ Dbg("write sub header");
+ if ((ret = write_sub_header()) < 0) {
+ Err("writing sub header failed. error %d", ret);
+ goto done;
+ }
+
+ Dbg("writing memory bitmaps..");
+ if ((ret = write_bitmap(dump_part, header_blocks, bitmap_blocks)) < 0)
+ goto done;
+
+ max_written_blocks = total_ram_blocks;
+ if (dump_header.device_blocks < total_blocks) {
+ Warn("dump partition is too small. actual blocks %u. expected blocks %u. whole memory will not be saved",
+ dump_header.device_blocks, total_blocks);
+ max_written_blocks -= (total_blocks - dump_header.device_blocks);
+ }
+
+ dump_header.written_blocks += dump_header.sub_hdr_size;
+ dump_header.written_blocks += dump_header.bitmap_blocks;
+ write_header(dump_part);
+
+ printk("dumping memory..\n");
+ if ((ret = write_memory(dump_part, header_blocks + bitmap_blocks,
+ max_written_blocks, &written_blocks)) < 0)
+ goto done;
+
+ /*
+ * Set the number of block that is written into and write it
+ * into partition again.
+ */
+ dump_header.written_blocks += written_blocks;
+ dump_header.status = DUMP_HEADER_COMPLETED;
+ write_header(dump_part);
+
+ dump_err = 0;
+
+done:
+ Dbg("do adapter shutdown.");
+ if (dump_device && dump_device->ops.shutdown)
+ if (dump_device->ops.shutdown(dump_device))
+ Err("adapter shutdown failed.");
+}
+
+static struct disk_dump_partition *find_dump_partition(struct block_device *bdev)
+{
+ struct disk_dump_device *dump_device;
+ struct disk_dump_partition *dump_part;
+
+ list_for_each_entry(dump_device, &disk_dump_devices, list)
+ list_for_each_entry(dump_part, &dump_device->partitions, list)
+ if (dump_part->bdev == bdev)
+ return dump_part;
+ return NULL;
+}
+
+static struct disk_dump_device *find_dump_device(struct disk_dump_device *device)
+{
+ struct disk_dump_device *dump_device;
+
+ list_for_each_entry(dump_device, &disk_dump_devices, list)
+ if (device->device == dump_device->device)
+ return dump_device;
+ return NULL;
+}
+
+static void *find_real_device(struct device *dev,
+ struct disk_dump_type **_dump_type)
+{
+ void *real_device;
+ struct disk_dump_type *dump_type;
+
+ list_for_each_entry(dump_type, &disk_dump_types, list)
+ if ((real_device = dump_type->probe(dev)) != NULL) {
+ *_dump_type = dump_type;
+ return real_device;
+ }
+ return NULL;
+}
+
+/*
+ * Add dump partition structure corresponding to file to the dump device
+ * structure.
+ */
+static int add_dump_partition(struct disk_dump_device *dump_device,
+ struct block_device *bdev)
+{
+ struct disk_dump_partition *dump_part;
+ char buffer[BDEVNAME_SIZE];
+
+ if (!(dump_part = kmalloc(sizeof(*dump_part), GFP_KERNEL)))
+ return -ENOMEM;
+
+ dump_part->device = dump_device;
+ dump_part->bdev = bdev;
+
+ if (!bdev || !bdev->bd_part)
+ return -EINVAL;
+ dump_part->nr_sects = bdev->bd_part->nr_sects;
+ dump_part->start_sect = bdev->bd_part->start_sect;
+
+ if (SECTOR_BLOCK(dump_part->nr_sects) < total_blocks)
+ Warn("%s is too small to save whole system memory\n",
+ bdevname(bdev, buffer));
+
+ list_add(&dump_part->list, &dump_device->partitions);
+
+ return 0;
+}
+
+/*
+ * Add dump device and partition.
+ * Must be called with disk_dump_mutex held.
+ */
+static int add_dump(struct device *dev, struct block_device *bdev)
+{
+ struct disk_dump_type *dump_type = NULL;
+ struct disk_dump_device *dump_device;
+ void *real_device;
+ int ret;
+
+ if ((ret = blkdev_get(bdev, FMODE_READ, 0)) < 0)
+ return ret;
+
+ /* Check whether this block device is already registered */
+ if (find_dump_partition(bdev)) {
+ blkdev_put(bdev);
+ return -EEXIST;
+ }
+
+ /* find dump_type and real device for this inode */
+ if (!(real_device = find_real_device(dev, &dump_type))) {
+ blkdev_put(bdev);
+ return -ENXIO;
+ }
+
+ /* Check whether this device is already registered */
+ dump_device = find_dump_device(real_device);
+ if (dump_device == NULL) {
+ /* real_device is not registered. create new dump_device */
+ if (!(dump_device = kmalloc(sizeof(*dump_device), GFP_KERNEL))) {
+ blkdev_put(bdev);
+ return -ENOMEM;
+ }
+
+ memset(dump_device, 0, sizeof(*dump_device));
+ INIT_LIST_HEAD(&dump_device->partitions);
+
+ dump_device->dump_type = dump_type;
+ dump_device->device = real_device;
+ if ((ret = dump_type->add_device(dump_device)) < 0) {
+ kfree(dump_device);
+ blkdev_put(bdev);
+ return ret;
+ }
+ if (!try_module_get(dump_type->owner))
+ return -EINVAL;
+ list_add(&dump_device->list, &disk_dump_devices);
+ }
+
+ ret = add_dump_partition(dump_device, bdev);
+ if (ret < 0 && list_empty(&dump_device->list)) {
+ dump_type->remove_device(dump_device);
+ module_put(dump_type->owner);
+ list_del(&dump_device->list);
+ kfree(dump_device);
+ }
+ if (ret < 0)
+ blkdev_put(bdev);
+
+ return ret;
+}
+
+/*
+ * Remove dump partition corresponding to bdev.
+ * Must be called with disk_dump_mutex held.
+ */
+static int remove_dump(struct block_device *bdev)
+{
+ struct disk_dump_device *dump_device;
+ struct disk_dump_partition *dump_part;
+ struct disk_dump_type *dump_type;
+
+ if (!(dump_part = find_dump_partition(bdev))) {
+ bdput(bdev);
+ return -ENOENT;
+ }
+
+ blkdev_put(bdev);
+ dump_device = dump_part->device;
+ list_del(&dump_part->list);
+ kfree(dump_part);
+
+ if (list_empty(&dump_device->partitions)) {
+ dump_type = dump_device->dump_type;
+ dump_type->remove_device(dump_device);
+ module_put(dump_type->owner);
+ list_del(&dump_device->list);
+ kfree(dump_device);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+static struct disk_dump_partition *dump_part_by_pos(struct seq_file *seq,
+ loff_t pos)
+{
+ struct disk_dump_device *dump_device;
+ struct disk_dump_partition *dump_part;
+
+ list_for_each_entry(dump_device, &disk_dump_devices, list) {
+ seq->private = dump_device;
+ list_for_each_entry(dump_part, &dump_device->partitions, list)
+ if (!pos--)
+ return dump_part;
+ }
+ return NULL;
+}
+
+static void *disk_dump_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ loff_t n = *pos;
+
+ down(&disk_dump_mutex);
+
+ if (!n--)
+ return (void *)1; /* header */
+
+ return dump_part_by_pos(seq, n);
+}
+
+static void *disk_dump_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct list_head *partition = v;
+ struct list_head *device = seq->private;
+ struct disk_dump_device *dump_device;
+
+ (*pos)++;
+ if (v == (void *)1)
+ return dump_part_by_pos(seq, 0);
+
+ dump_device = list_entry(device, struct disk_dump_device, list);
+
+ partition = partition->next;
+ if (partition != &dump_device->partitions)
+ return partition;
+
+ device = device->next;
+ seq->private = device;
+ if (device == &disk_dump_devices)
+ return NULL;
+
+ dump_device = list_entry(device, struct disk_dump_device, list);
+
+ return dump_device->partitions.next;
+}
+
+static void disk_dump_seq_stop(struct seq_file *seq, void *v)
+{
+ up(&disk_dump_mutex);
+}
+
+static int disk_dump_seq_show(struct seq_file *seq, void *v)
+{
+ struct disk_dump_partition *dump_part = v;
+ char buf[BDEVNAME_SIZE];
+
+ if (v == (void *)1) { /* header */
+ seq_printf(seq, "# sample_rate: %u\n", sample_rate);
+ seq_printf(seq, "# block_order: %u\n", block_order);
+ seq_printf(seq, "# fallback_on_err: %u\n", fallback_on_err);
+ seq_printf(seq, "# allow_risky_dumps: %u\n", allow_risky_dumps);
+ seq_printf(seq, "# total_blocks: %u\n", total_blocks);
+ seq_printf(seq, "#\n");
+
+ return 0;
+ }
+
+ seq_printf(seq, "%s %lu %lu\n", bdevname(dump_part->bdev, buf),
+ dump_part->start_sect, dump_part->nr_sects);
+ return 0;
+}
+
+static struct seq_operations disk_dump_seq_ops = {
+ .start = disk_dump_seq_start,
+ .next = disk_dump_seq_next,
+ .stop = disk_dump_seq_stop,
+ .show = disk_dump_seq_show,
+};
+
+static int disk_dump_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &disk_dump_seq_ops);
+}
+
+static struct file_operations disk_dump_fops = {
+ .owner = THIS_MODULE,
+ .open = disk_dump_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+#endif
+
+int register_disk_dump_device(struct device *dev, struct block_device *bdev)
+{
+ int ret;
+
+ down(&disk_dump_mutex);
+ ret = add_dump(dev, bdev);
+ set_crc_modules();
+ up(&disk_dump_mutex);
+
+ return ret;
+}
+
+int unregister_disk_dump_device(struct block_device *bdev)
+{
+ int ret;
+
+ down(&disk_dump_mutex);
+ ret = remove_dump(bdev);
+ set_crc_modules();
+ up(&disk_dump_mutex);
+
+ return ret;
+}
+
+int find_disk_dump_device(struct block_device *bdev)
+{
+ int ret;
+
+ down(&disk_dump_mutex);
+ ret = (find_dump_partition(bdev) != NULL);
+ up(&disk_dump_mutex);
+
+ return ret;
+}
+
+int register_disk_dump_type(struct disk_dump_type *dump_type)
+{
+ down(&disk_dump_mutex);
+ list_add(&dump_type->list, &disk_dump_types);
+ set_crc_modules();
+ up(&disk_dump_mutex);
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(register_disk_dump_type);
+
+int unregister_disk_dump_type(struct disk_dump_type *dump_type)
+{
+ down(&disk_dump_mutex);
+ list_del(&dump_type->list);
+ set_crc_modules();
+ up(&disk_dump_mutex);
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(unregister_disk_dump_type);
+
+static void compute_total_blocks(void)
+{
+ unsigned long nr;
+
+ /*
+ * the number of block of the common header and the header
+ * that is depend on the architecture
+ *
+ * block 0: dump partition header
+ * block 1: dump header
+ * block 2: dump subheader
+ * block 3..n: memory bitmap
+ * block (n + 1)...: saved memory
+ *
+ * We never overwrite block 0
+ */
+ header_blocks = 2 + size_of_sub_header();
+
+ total_ram_blocks = 0;
+ for (nr = next_ram_page(ULONG_MAX); nr < max_pfn; nr = next_ram_page(nr))
+ total_ram_blocks++;
+
+ bitmap_blocks = ROUNDUP(max_pfn, 8 * PAGE_SIZE);
+
+ /*
+ * The necessary size of area for dump is:
+ * 1 block for common header
+ * m blocks for architecture dependent header
+ * n blocks for memory bitmap
+ * and whole memory
+ */
+ total_blocks = header_blocks + bitmap_blocks + total_ram_blocks;
+
+ Info("total blocks required: %u (header %u + bitmap %u + memory %u)",
+ total_blocks, header_blocks, bitmap_blocks, total_ram_blocks);
+}
+
+struct disk_dump_ops dump_ops = {
+ .add_dump = register_disk_dump_device,
+ .remove_dump = unregister_disk_dump_device,
+ .find_dump = find_disk_dump_device,
+};
+
+static int init_diskdump(void)
+{
+ unsigned long long t0;
+ unsigned long long t1;
+ struct page *page;
+
+ if (!platform_supports_diskdump) {
+ Err("platform does not support diskdump.");
+ return -1;
+ }
+
+ /* Allocate one block that is used temporally */
+ do {
+ page = alloc_pages(GFP_KERNEL, block_order);
+ if (page != NULL)
+ break;
+ } while (--block_order >= 0);
+ if (!page) {
+ Err("alloc_pages failed.");
+ return -1;
+ }
+ scratch = page_address(page);
+ Info("Maximum block size: %lu", PAGE_SIZE << block_order);
+
+ if (diskdump_register_hook(start_disk_dump)) {
+ Err("failed to register hooks.");
+ return -1;
+ }
+
+ if (diskdump_register_ops(&dump_ops)) {
+ Err("failed to register ops.");
+ return -1;
+ }
+
+ compute_total_blocks();
+
+ platform_timestamp(t0);
+ diskdump_mdelay(1);
+ platform_timestamp(t1);
+ timestamp_1sec = (unsigned long)(t1 - t0) * 1000;
+
+ /*
+ * Allocate a separate stack for diskdump.
+ */
+ platform_init_stack(&diskdump_stack);
+
+ down(&disk_dump_mutex);
+ set_crc_modules();
+ up(&disk_dump_mutex);
+
+#ifdef CONFIG_PROC_FS
+ {
+ struct proc_dir_entry *p;
+
+ p = create_proc_entry("diskdump", S_IRUGO|S_IWUSR, NULL);
+ if (p)
+ p->proc_fops = &disk_dump_fops;
+ }
+#endif
+
+ return 0;
+}
+
+static void cleanup_diskdump(void)
+{
+ Info("shut down.");
+ diskdump_unregister_hook();
+ diskdump_unregister_ops();
+ platform_cleanup_stack(diskdump_stack);
+ free_pages((unsigned long)scratch, block_order);
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("diskdump", NULL);
+#endif
+}
+
+module_init(init_diskdump);
+module_exit(cleanup_diskdump);
+
+MODULE_LICENSE("GPL");
diff -Nur linux-2.6.9.org/drivers/char/sysrq.c linux-2.6.9/drivers/char/sysrq.c
--- linux-2.6.9.org/drivers/char/sysrq.c 2004-10-19 06:55:06.000000000 +0900
+++ linux-2.6.9/drivers/char/sysrq.c 2004-11-26 20:13:17.780573678 +0900
@@ -107,6 +107,17 @@
.action_msg = "Resetting",
};

+/* crash sysrq handler */
+static void sysrq_handle_crash(int key, struct pt_regs *pt_regs,
+ struct tty_struct *tty) {
+ *( (char *) 0) = 0;
+}
+static struct sysrq_key_op sysrq_crash_op = {
+ .handler = sysrq_handle_crash,
+ .help_msg = "Crash",
+ .action_msg = "Crashing the kernel by request",
+};
+
static void sysrq_handle_sync(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
@@ -235,7 +246,7 @@
it is handled specially on the sparc
and will never arrive */
/* b */ &sysrq_reboot_op,
-/* c */ NULL,
+/* c */ &sysrq_crash_op,
/* d */ NULL,
/* e */ &sysrq_term_op,
/* f */ NULL,
diff -Nur linux-2.6.9.org/include/asm-generic/crashdump.h linux-2.6.9/include/asm-generic/crashdump.h
--- linux-2.6.9.org/include/asm-generic/crashdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-generic/crashdump.h 2004-11-26 20:13:17.780573678 +0900
@@ -0,0 +1,47 @@
+#ifndef _ASM_GENERIC_CRASHDUMP_H_
+#define _ASM_GENERIC_CRASHDUMP_H_
+
+/*
+ * linux/include/asm-generic/crashdump.h
+ *
+ * Copyright (c) 2003, 2004 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifdef __KERNEL__
+
+#define platform_timestamp(x) do { (x) = 0; } while (0)
+
+#define platform_fix_regs() do { } while (0)
+#define platform_init_stack(stackptr) do { } while (0)
+#define platform_cleanup_stack(stackptr) do { } while (0)
+#define platform_start_crashdump(stackptr,dumpfunc,regs) (0)
+
+#undef ELF_CORE_COPY_REGS
+#define ELF_CORE_COPY_REGS(x, y) do { struct pt_regs *z; z = (y); } while (0)
+
+#define show_mem() do {} while (0)
+
+#define show_state() do {} while (0)
+
+#define show_regs(x) do { struct pt_regs *z; z = (x); } while (0)
+
+#undef KM_CRASHDUMP
+#define KM_CRASHDUMP 0
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_GENERIC_CRASHDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-generic/diskdump.h linux-2.6.9/include/asm-generic/diskdump.h
--- linux-2.6.9.org/include/asm-generic/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-generic/diskdump.h 2004-11-26 20:13:17.781550241 +0900
@@ -0,0 +1,13 @@
+#ifndef _ASM_GENERIC_DISKDUMP_H_
+#define _ASM_GENERIC_DISKDUMP_H_
+
+#include <asm-generic/crashdump.h>
+
+const static int platform_supports_diskdump = 0;
+
+struct disk_dump_sub_header {};
+
+#define size_of_sub_header() 1
+#define write_sub_header() 1
+
+#endif /* _ASM_GENERIC_DISKDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-i386/crashdump.h linux-2.6.9/include/asm-i386/crashdump.h
--- linux-2.6.9.org/include/asm-i386/crashdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-i386/crashdump.h 2004-11-26 20:13:17.781550241 +0900
@@ -0,0 +1,113 @@
+#ifndef _ASM_I386_CRASHDUMP_H
+#define _ASM_I386_CRASHDUMP_H
+
+/*
+ * linux/include/asm-i386/crashdump.h
+ *
+ * Copyright (c) 2003, 2004 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <asm/irq.h>
+
+extern int page_is_ram (unsigned long);
+extern unsigned long next_ram_page (unsigned long);
+
+#define platform_timestamp(x) rdtscll(x)
+
+#define platform_fix_regs() \
+{ \
+ unsigned long esp; \
+ unsigned short ss; \
+ esp = (unsigned long) ((char *)regs + sizeof (struct pt_regs)); \
+ ss = __KERNEL_DS; \
+ if (regs->xcs & 3) { \
+ esp = regs->esp; \
+ ss = regs->xss & 0xffff; \
+ } \
+ myregs = *regs; \
+ myregs.esp = esp; \
+ myregs.xss = (myregs.xss & 0xffff0000) | ss; \
+};
+
+static inline void platform_init_stack(void **stackptr)
+{
+#ifdef CONFIG_4KSTACKS
+ *stackptr = (void *)kmalloc(sizeof(union irq_ctx), GFP_KERNEL);
+ if (*stackptr)
+ memset(*stackptr, 0, sizeof(union irq_ctx));
+ else
+ printk(KERN_WARNING
+ "crashdump: unable to allocate separate stack\n");
+#endif
+}
+
+typedef asmlinkage void (*crashdump_func_t)(struct pt_regs *, void *);
+
+static inline void platform_start_crashdump(void *stackptr,
+ crashdump_func_t dumpfunc,
+ struct pt_regs *regs)
+{
+#ifdef CONFIG_4KSTACKS
+ u32 *dsp;
+ union irq_ctx * curctx;
+ union irq_ctx * dumpctx;
+
+ if (!stackptr)
+ dumpfunc(regs, NULL);
+ else {
+ curctx = (union irq_ctx *) current_thread_info();
+ dumpctx = (union irq_ctx *) stackptr;
+
+ /* build the stack frame on the IRQ stack */
+ dsp = (u32*) ((char*)dumpctx + sizeof(*dumpctx));
+ dumpctx->tinfo.task = curctx->tinfo.task;
+ dumpctx->tinfo.previous_esp = current_stack_pointer();
+
+ *--dsp = (u32) NULL;
+ *--dsp = (u32) regs;
+
+ asm volatile(
+ " xchgl %%ebx,%%esp \n"
+ " call *%%eax \n"
+ " xchgl %%ebx,%%esp \n"
+ : : "a"(dumpfunc), "b"(dsp)
+ : "memory", "cc", "edx", "ecx"
+ );
+ }
+#else
+ dumpfunc(regs, NULL);
+#endif
+}
+
+#define platform_cleanup_stack(stackptr) \
+do { \
+ if (stackptr) \
+ kfree(stackptr); \
+} while (0)
+
+#define platform_freeze_cpu() \
+{ \
+ for (;;) local_irq_disable(); \
+}
+
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_I386_CRASHDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-i386/diskdump.h linux-2.6.9/include/asm-i386/diskdump.h
--- linux-2.6.9.org/include/asm-i386/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-i386/diskdump.h 2004-11-26 20:13:17.781550241 +0900
@@ -0,0 +1,55 @@
+#ifndef _ASM_I386_DISKDUMP_H
+#define _ASM_I386_DISKDUMP_H
+
+/*
+ * linux/include/asm-i386/diskdump.h
+ *
+ * Copyright (c) 2004 FUJITSU LIMITED
+ * Copyright (c) 2003 Red Hat, Inc. All rights reserved.
+ */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+#include <asm/crashdump.h>
+
+const static int platform_supports_diskdump = 1;
+
+struct disk_dump_sub_header {
+ elf_gregset_t elf_regs;
+};
+
+#define size_of_sub_header() ((sizeof(struct disk_dump_sub_header) + PAGE_SIZE - 1) / DUMP_BLOCK_SIZE)
+
+#define write_sub_header() \
+({ \
+ int ret; \
+ \
+ ELF_CORE_COPY_REGS(dump_sub_header.elf_regs, (&myregs)); \
+ clear_page(scratch); \
+ memcpy(scratch, &dump_sub_header, sizeof(dump_sub_header)); \
+ \
+ if ((ret = write_blocks(dump_part, 2, scratch, 1)) >= 0) \
+ ret = 1; /* size of sub header in page */; \
+ ret; \
+})
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_I386_DISKDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-i386/kmap_types.h linux-2.6.9/include/asm-i386/kmap_types.h
--- linux-2.6.9.org/include/asm-i386/kmap_types.h 2004-10-19 06:54:40.000000000 +0900
+++ linux-2.6.9/include/asm-i386/kmap_types.h 2004-11-26 20:13:17.782526803 +0900
@@ -23,7 +23,8 @@
D(10) KM_IRQ1,
D(11) KM_SOFTIRQ0,
D(12) KM_SOFTIRQ1,
-D(13) KM_TYPE_NR
+D(13) KM_CRASHDUMP,
+D(14) KM_TYPE_NR
};

#undef D
diff -Nur linux-2.6.9.org/include/asm-ia64/crashdump.h linux-2.6.9/include/asm-ia64/crashdump.h
--- linux-2.6.9.org/include/asm-ia64/crashdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-ia64/crashdump.h 2004-11-26 20:13:17.782526803 +0900
@@ -0,0 +1,76 @@
+#ifndef _ASM_IA64_CRASHDUMP_H
+#define _ASM_IA64_CRASHDUMP_H
+
+/*
+ * linux/include/asm-ia64/crashdump.h
+ *
+ * Copyright (c) 2004 FUJITSU LIMITED
+ * Copyright (c) 2003 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+#include <asm/unwind.h>
+#include <asm/ptrace.h>
+
+extern void ia64_freeze_cpu(struct unw_frame_info *, void *arg);
+extern void ia64_start_dump(struct unw_frame_info *, void *arg);
+extern int page_is_ram(unsigned long);
+extern unsigned long next_ram_page(unsigned long);
+
+#define platform_timestamp(x) ({ x = ia64_get_itc(); })
+
+#define platform_fix_regs() \
+{ \
+ struct unw_frame_info *info = platform_arg; \
+ \
+ current->thread.ksp = (__u64)info->sw - 16; \
+ myregs = *regs; \
+}
+
+#define platform_freeze_cpu() \
+{ \
+ unw_init_running(ia64_freeze_cpu, NULL); \
+}
+
+#define platform_init_stack(stackptr) do { } while (0)
+#define platform_cleanup_stack(stackptr) do { } while (0)
+
+typedef asmlinkage void (*crashdump_func_t)(struct pt_regs *, void *);
+
+/* Container to hold dump hander information */
+struct dump_call_param {
+ crashdump_func_t func;
+ struct pt_regs *regs;
+};
+
+static inline void platform_start_crashdump(void *stackptr,
+ crashdump_func_t dumpfunc,
+ struct pt_regs *regs)
+{
+ struct dump_call_param param;
+
+ param.func = dumpfunc;
+ param.regs = regs;
+ unw_init_running(ia64_start_dump, &param);
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_CRASHDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-ia64/diskdump.h linux-2.6.9/include/asm-ia64/diskdump.h
--- linux-2.6.9.org/include/asm-ia64/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-ia64/diskdump.h 2004-11-26 20:13:17.782526803 +0900
@@ -0,0 +1,58 @@
+#ifndef _ASM_IA64_DISKDUMP_H
+#define _ASM_IA64_DISKDUMP_H
+
+/*
+ * linux/include/asm-ia64/diskdump.h
+ *
+ * Copyright (c) 2004 FUJITSU LIMITED
+ * Copyright (c) 2003 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+#include <asm/crashdump.h>
+#include <asm/unwind.h>
+
+extern void ia64_do_copy_regs(struct unw_frame_info *, void *arg);
+
+const static int platform_supports_diskdump = 1;
+
+struct disk_dump_sub_header {
+ elf_gregset_t elf_regs;
+};
+
+#define size_of_sub_header() ((sizeof(struct disk_dump_sub_header) + PAGE_SIZE - 1) / DUMP_BLOCK_SIZE)
+
+#define write_sub_header() \
+({ \
+ int ret; \
+ struct unw_frame_info *info = platform_arg; \
+ \
+ ia64_do_copy_regs(info, &dump_sub_header.elf_regs); \
+ clear_page(scratch); \
+ memcpy(scratch, &dump_sub_header, sizeof(dump_sub_header)); \
+ \
+ if ((ret = write_blocks(dump_part, 2, scratch, 1)) >= 0) \
+ ret = 1; /* size of sub header in page */; \
+ ret; \
+})
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_DISKDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-ppc/diskdump.h linux-2.6.9/include/asm-ppc/diskdump.h
--- linux-2.6.9.org/include/asm-ppc/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-ppc/diskdump.h 2004-11-26 20:13:17.783503366 +0900
@@ -0,0 +1,6 @@
+#ifndef _ASM_PPC_DISKDUMP_H_
+#define _ASM_PPC_DISKDUMP_H_
+
+#include <asm-generic/diskdump.h>
+
+#endif /* _ASM_PPC_DISKDUMP_H_ */
diff -Nur linux-2.6.9.org/include/asm-ppc64/crashdump.h linux-2.6.9/include/asm-ppc64/crashdump.h
--- linux-2.6.9.org/include/asm-ppc64/crashdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-ppc64/crashdump.h 2004-11-26 20:13:17.783503366 +0900
@@ -0,0 +1,61 @@
+#ifndef _ASM_PPC64_CRASHDUMP_H
+#define _ASM_PPC64_CRASHDUMP_H
+
+/*
+ * linux/include/asm-ppc64/crashdump.h
+ *
+ * Copyright (c) 2003, 2004 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <asm/time.h>
+
+extern int page_is_ram (unsigned long);
+extern unsigned long next_ram_page (unsigned long);
+
+#define platform_timestamp(x) (x = get_tb())
+
+#define platform_fix_regs() \
+{ \
+ memcpy(&myregs, regs, sizeof(struct pt_regs)); \
+};
+
+#define platform_init_stack(stackptr) do { } while (0)
+#define platform_cleanup_stack(stackptr) do { } while (0)
+
+typedef asmlinkage void (*crashdump_func_t)(struct pt_regs *, void *);
+
+static inline void platform_start_crashdump(void *stackptr,
+ crashdump_func_t dumpfunc,
+ struct pt_regs *regs)
+{
+ dumpfunc(regs, NULL);
+}
+
+#define platform_freeze_cpu() \
+{ \
+ current->thread.ksp = __get_SP(); \
+ for (;;) local_irq_disable(); \
+}
+
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_PPC64_CRASHDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-ppc64/diskdump.h linux-2.6.9/include/asm-ppc64/diskdump.h
--- linux-2.6.9.org/include/asm-ppc64/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-ppc64/diskdump.h 2004-11-26 20:13:17.783503366 +0900
@@ -0,0 +1,55 @@
+#ifndef _ASM_PPC64_DISKDUMP_H_
+#define _ASM_PPC64_DISKDUMP_H_
+
+/*
+ * linux/include/asm-ppc64/diskdump.h
+ *
+ * Copyright (c) 2004 FUJITSU LIMITED
+ * Copyright (c) 2003 Red Hat, Inc. All rights reserved.
+ */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+#include <asm/crashdump.h>
+
+const static int platform_supports_diskdump = 1;
+
+struct disk_dump_sub_header {
+ elf_gregset_t elf_regs;
+};
+
+#define size_of_sub_header() ((sizeof(struct disk_dump_sub_header) + PAGE_SIZE - 1) / DUMP_BLOCK_SIZE)
+
+#define write_sub_header() \
+({ \
+ int ret; \
+ struct disk_dump_sub_header *header; \
+ \
+ header = (struct disk_dump_sub_header *)scratch; \
+ ELF_CORE_COPY_REGS(header->elf_regs, (&myregs)); \
+ clear_page(scratch); \
+ if ((ret = write_blocks(dump_part, 2, scratch, 1)) >= 0)\
+ ret = 1; /* size of sub header in page */; \
+ ret; \
+})
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_PPC64_DISKDUMP_H_ */
diff -Nur linux-2.6.9.org/include/asm-s390/diskdump.h linux-2.6.9/include/asm-s390/diskdump.h
--- linux-2.6.9.org/include/asm-s390/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-s390/diskdump.h 2004-11-26 20:13:17.784479928 +0900
@@ -0,0 +1,6 @@
+#ifndef _ASM_S390_DISKDUMP_H_
+#define _ASM_S390_DISKDUMP_H_
+
+#include <asm-generic/diskdump.h>
+
+#endif /* _ASM_S390_DISKDUMP_H_ */
diff -Nur linux-2.6.9.org/include/asm-x86_64/crashdump.h linux-2.6.9/include/asm-x86_64/crashdump.h
--- linux-2.6.9.org/include/asm-x86_64/crashdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-x86_64/crashdump.h 2004-11-26 20:13:17.784479928 +0900
@@ -0,0 +1,86 @@
+/*
+ * include/asm-x86_64/crashdump.h
+ *
+ * Copyright (C) Hitachi, Ltd. 2004
+ * Written by Satoshi Oshima (oshima@sdl.hitachi.co.jp)
+ *
+ * Derived from include/asm-i386/diskdump.h
+ * Copyright (c) 2004 FUJITSU LIMITED
+ * Copyright (c) 2003 Red Hat, Inc. All rights reserved.
+ *
+ */
+
+#ifndef _ASM_X86_64_CRASHDUMP_H
+#define _ASM_X86_64_CRASHDUMP_H
+
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+
+extern int page_is_ram(unsigned long);
+extern unsigned long next_ram_page(unsigned long);
+
+#define platform_fix_regs() \
+{ \
+ unsigned long rsp; \
+ unsigned short ss; \
+ rsp = (unsigned long) ((char *)regs + sizeof (struct pt_regs)); \
+ ss = __KERNEL_DS; \
+ if (regs->cs & 3) { \
+ rsp = regs->rsp; \
+ ss = regs->ss & 0xffff; \
+ } \
+ myregs = *regs; \
+ myregs.rsp = rsp; \
+ myregs.ss = (myregs.ss & (~0xffff)) | ss; \
+}
+
+#define platform_timestamp(x) rdtscll(x)
+
+#define platform_freeze_cpu() \
+{ \
+ for (;;) local_irq_disable(); \
+}
+
+static inline void platform_init_stack(void **stackptr)
+{
+ struct page *page;
+
+ if ((page = alloc_page(GFP_KERNEL)))
+ *stackptr = (void *)page_address(page);
+
+ if (*stackptr)
+ memset(*stackptr, 0, PAGE_SIZE);
+ else
+ printk(KERN_WARNING
+ "crashdump: unable to allocate separate stack\n");
+}
+
+#define platform_cleanup_stack(stackptr) \
+do { \
+ if (stackptr) \
+ free_page((unsigned long)stackptr); \
+} while (0)
+
+typedef asmlinkage void (*crashdump_func_t)(struct pt_regs *, void *);
+
+static inline void platform_start_crashdump(void *stackptr,
+ crashdump_func_t dumpfunc,
+ struct pt_regs *regs)
+{
+ static unsigned long old_rsp;
+ unsigned long new_rsp;
+
+ if (stackptr) {
+ asm volatile("movq %%rsp,%0" : "=r" (old_rsp));
+ new_rsp = (unsigned long)stackptr + PAGE_SIZE;
+ asm volatile("movq %0,%%rsp" :: "r" (new_rsp));
+ dumpfunc(regs, NULL);
+ asm volatile("movq %0,%%rsp" :: "r" (old_rsp));
+ } else
+ dumpfunc(regs, NULL);
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_X86_64_CRASHDUMP_H */
diff -Nur linux-2.6.9.org/include/asm-x86_64/diskdump.h linux-2.6.9/include/asm-x86_64/diskdump.h
--- linux-2.6.9.org/include/asm-x86_64/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/asm-x86_64/diskdump.h 2004-11-26 20:13:17.784479928 +0900
@@ -0,0 +1,44 @@
+/*
+ * include/asm-x86_64/diskdump.h
+ *
+ * Copyright (C) Hitachi, Ltd. 2004
+ * Written by Satoshi Oshima (oshima@sdl.hitachi.co.jp)
+ *
+ * Derived from include/asm-i386/diskdump.h
+ * Copyright (c) 2004 FUJITSU LIMITED
+ * Copyright (c) 2003 Red Hat, Inc. All rights reserved.
+ *
+ */
+
+#ifndef _ASM_X86_64_DISKDUMP_H
+#define _ASM_X86_64_DISKDUMP_H
+
+#ifdef __KERNEL__
+
+#include <linux/elf.h>
+#include <asm/crashdump.h>
+
+const static int platform_supports_diskdump = 1;
+
+struct disk_dump_sub_header {
+ elf_gregset_t elf_regs;
+};
+
+#define size_of_sub_header() ((sizeof(struct disk_dump_sub_header) + PAGE_SIZE - 1) / DUMP_BLOCK_SIZE)
+
+#define write_sub_header() \
+({ \
+ int ret; \
+ \
+ ELF_CORE_COPY_REGS(dump_sub_header.elf_regs, (&myregs)); \
+ clear_page(scratch); \
+ memcpy(scratch, &dump_sub_header, sizeof(dump_sub_header)); \
+ \
+ if ((ret = write_blocks(dump_part, 2, scratch, 1)) >= 0) \
+ ret = 1; /* size of sub header in page */; \
+ ret; \
+})
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_X86_64_DISKDUMP_H */
diff -Nur linux-2.6.9.org/include/linux/diskdump.h linux-2.6.9/include/linux/diskdump.h
--- linux-2.6.9.org/include/linux/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/include/linux/diskdump.h 2004-11-26 20:13:17.795222116 +0900
@@ -0,0 +1,192 @@
+#ifndef _LINUX_DISKDUMP_H
+#define _LINUX_DISKDUMP_H
+
+/*
+ * linux/include/linux/diskdump.h
+ *
+ * Copyright (c) 2004 FUJITSU LIMITED
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/list.h>
+#include <linux/blkdev.h>
+#include <linux/utsname.h>
+#include <linux/device.h>
+#include <linux/nmi.h>
+
+/* The minimum Dump I/O unit. Must be the same of PAGE_SIZE */
+#define DUMP_BLOCK_SIZE PAGE_SIZE
+#define DUMP_BLOCK_SHIFT PAGE_SHIFT
+
+int diskdump_register_hook(void (*dump_func)(struct pt_regs *));
+void diskdump_unregister_hook(void);
+
+/*
+ * The handler of diskdump module
+ */
+struct disk_dump_ops {
+ int (*add_dump)(struct device *, struct block_device *);
+ int (*remove_dump)(struct block_device *);
+ int (*find_dump)(struct block_device *);
+};
+
+int diskdump_register_ops(struct disk_dump_ops* op);
+void diskdump_unregister_ops(void);
+
+
+/*
+ * The handler that adapter driver provides for the common module of
+ * dump
+ */
+struct disk_dump_partition;
+struct disk_dump_device;
+
+struct disk_dump_type {
+ void *(*probe)(struct device *);
+ int (*add_device)(struct disk_dump_device *);
+ void (*remove_device)(struct disk_dump_device *);
+ struct module *owner;
+ struct list_head list;
+};
+
+struct disk_dump_device_ops {
+ int (*sanity_check)(struct disk_dump_device *);
+ int (*quiesce)(struct disk_dump_device *);
+ int (*shutdown)(struct disk_dump_device *);
+ int (*rw_block)(struct disk_dump_partition *, int rw, unsigned long block_nr, void *buf, int len);
+};
+
+/* The data structure for a dump device */
+struct disk_dump_device {
+ struct list_head list;
+ struct disk_dump_device_ops ops;
+ struct disk_dump_type *dump_type;
+ void *device;
+ unsigned int max_blocks;
+ struct list_head partitions;
+};
+
+/* The data structure for a dump partition */
+struct disk_dump_partition {
+ struct list_head list;
+ struct disk_dump_device *device;
+ struct block_device *bdev;
+ unsigned long start_sect;
+ unsigned long nr_sects;
+};
+
+int register_disk_dump_type(struct disk_dump_type *);
+int unregister_disk_dump_type(struct disk_dump_type *);
+
+
+/*
+ * sysfs interface
+ */
+ssize_t diskdump_sysfs_store(struct device *dev, const char *buf, size_t count);
+ssize_t diskdump_sysfs_show(struct device *dev, char *buf);
+
+
+void diskdump_update(void);
+void diskdump_setup_timestamp(void);
+
+#define diskdump_mdelay(n) \
+({ \
+ unsigned long __ms=(n); \
+ while (__ms--) { \
+ udelay(1000); \
+ touch_nmi_watchdog(); \
+ } \
+})
+
+
+/*
+ * Architecture-independent dump header
+ */
+
+/* The signature which is written in each block in the dump partition */
+#define DISK_DUMP_SIGNATURE "DISKDUMP"
+#define DISK_DUMP_HEADER_VERSION 1
+
+#define DUMP_PARTITION_SIGNATURE "diskdump"
+
+#define DUMP_HEADER_COMPLETED 0
+#define DUMP_HEADER_INCOMPLETED 1
+
+struct disk_dump_header {
+ char signature[8]; /* = "DISKDUMP" */
+ int header_version; /* Dump header version */
+ struct new_utsname utsname; /* copy of system_utsname */
+ struct timespec timestamp; /* Time stamp */
+ unsigned int status; /* Above flags */
+ int block_size; /* Size of a block in byte */
+ int sub_hdr_size; /* Size of arch dependent
+ header in blocks */
+ unsigned int bitmap_blocks; /* Size of Memory bitmap in
+ block */
+ unsigned int max_mapnr; /* = max_mapnr */
+ unsigned int total_ram_blocks;/* Size of Memory in block */
+ unsigned int device_blocks; /* Number of total blocks in
+ * the dump device */
+ unsigned int written_blocks; /* Number of written blocks */
+ unsigned int current_cpu; /* CPU# which handles dump */
+ int nr_cpus; /* Number of CPUs */
+ struct task_struct *tasks[NR_CPUS];
+};
+
+/* Diskdump state */
+extern enum disk_dump_states {
+ DISK_DUMP_INITIAL,
+ DISK_DUMP_RUNNING,
+ DISK_DUMP_SUCCESS,
+ DISK_DUMP_FAILURE,
+} disk_dump_state;
+
+/*
+ * Calculate the check sum of the whole module
+ */
+#define get_crc_module() \
+({ \
+ struct module *module = &__this_module; \
+ crc32_le(0, (char *)(module->module_core), \
+ ((unsigned long)module - (unsigned long)(module->module_core))); \
+})
+
+/* Calculate the checksum of the whole module */
+#define set_crc_modules() \
+({ \
+ module_crc = 0; \
+ module_crc = get_crc_module(); \
+})
+
+/*
+ * Compare the checksum value that is stored in module_crc to the check
+ * sum of current whole module. Must be called with holding disk_dump_lock.
+ * Return TRUE if they are the same, else return FALSE
+ *
+ */
+#define check_crc_module() \
+({ \
+ uint32_t orig_crc, cur_crc; \
+ \
+ orig_crc = module_crc; module_crc = 0; \
+ cur_crc = get_crc_module(); \
+ module_crc = orig_crc; \
+ orig_crc == cur_crc; \
+})
+
+
+#endif /* _LINUX_DISKDUMP_H */
diff -Nur linux-2.6.9.org/include/linux/interrupt.h linux-2.6.9/include/linux/interrupt.h
--- linux-2.6.9.org/include/linux/interrupt.h 2004-10-19 06:54:30.000000000 +0900
+++ linux-2.6.9/include/linux/interrupt.h 2004-11-26 20:13:17.796198678 +0900
@@ -247,4 +247,8 @@
extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */

+
+extern void dump_clear_tasklet(void);
+extern void dump_run_tasklet(void);
+
#endif
diff -Nur linux-2.6.9.org/include/linux/kernel.h linux-2.6.9/include/linux/kernel.h
--- linux-2.6.9.org/include/linux/kernel.h 2004-10-19 06:53:05.000000000 +0900
+++ linux-2.6.9/include/linux/kernel.h 2004-11-26 20:13:17.796198678 +0900
@@ -137,6 +137,15 @@
extern int tainted;
extern const char *print_tainted(void);

+#define crashdump_mode() unlikely(diskdump_mode)
+
+struct pt_regs;
+extern void try_crashdump(struct pt_regs *);
+extern void (*diskdump_func) (struct pt_regs *regs);
+extern int diskdump_mode;
+
+#define crashdump_func() unlikely(diskdump_func)
+
/* Values used for system_state */
extern enum system_states {
SYSTEM_BOOTING,
@@ -144,6 +153,7 @@
SYSTEM_HALT,
SYSTEM_POWER_OFF,
SYSTEM_RESTART,
+ SYSTEM_DUMPING,
} system_state;

#define TAINT_PROPRIETARY_MODULE (1<<0)
@@ -164,6 +174,12 @@
#define pr_info(fmt,arg...) \
printk(KERN_INFO fmt,##arg)

+#define pr_err(fmt,arg...) \
+ printk(KERN_ERR fmt,##arg)
+
+#define pr_warn(fmt,arg...) \
+ printk(KERN_WARNING fmt,##arg)
+
/*
* Display an IP address in readable format.
*/
diff -Nur linux-2.6.9.org/include/linux/timer.h linux-2.6.9/include/linux/timer.h
--- linux-2.6.9.org/include/linux/timer.h 2004-10-19 06:54:40.000000000 +0900
+++ linux-2.6.9/include/linux/timer.h 2004-11-26 20:13:17.796198678 +0900
@@ -99,4 +99,7 @@
extern void run_local_timers(void);
extern void it_real_fn(unsigned long);

+extern void dump_clear_timers(void);
+extern void dump_run_timers(void);
+
#endif
diff -Nur linux-2.6.9.org/include/linux/workqueue.h linux-2.6.9/include/linux/workqueue.h
--- linux-2.6.9.org/include/linux/workqueue.h 2004-10-19 06:54:54.000000000 +0900
+++ linux-2.6.9/include/linux/workqueue.h 2004-11-26 20:13:17.796198678 +0900
@@ -86,4 +86,7 @@
return ret;
}

+extern void dump_clear_workqueue(void);
+extern void dump_run_workqueue(void);
+
#endif
diff -Nur linux-2.6.9.org/kernel/Makefile linux-2.6.9/kernel/Makefile
--- linux-2.6.9.org/kernel/Makefile 2004-10-19 06:53:43.000000000 +0900
+++ linux-2.6.9/kernel/Makefile 2004-11-26 20:13:17.797175241 +0900
@@ -7,7 +7,7 @@
sysctl.o capability.o ptrace.o timer.o user.o \
signal.o sys.o kmod.o workqueue.o pid.o \
rcupdate.o intermodule.o extable.o params.o posix-timers.o \
- kthread.o
+ kthread.o dump.o

obj-$(CONFIG_FUTEX) += futex.o
obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
diff -Nur linux-2.6.9.org/kernel/dump.c linux-2.6.9/kernel/dump.c
--- linux-2.6.9.org/kernel/dump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.9/kernel/dump.c 2004-11-26 20:13:17.797175241 +0900
@@ -0,0 +1,241 @@
+/*
+ * linux/kernel/dump.c
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Written by Nobuhiro Tachino (ntachino@jp.fujitsu.com)
+ *
+ */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/nmi.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/genhd.h>
+#include <linux/diskdump.h>
+#include <asm/diskdump.h>
+
+static DECLARE_MUTEX(dump_ops_mutex);
+struct disk_dump_ops* dump_ops = NULL;
+
+int diskdump_mode = 0;
+EXPORT_SYMBOL_GPL(diskdump_mode);
+
+void (*diskdump_func) (struct pt_regs *regs) = NULL;
+EXPORT_SYMBOL_GPL(diskdump_func);
+
+static unsigned long long timestamp_base;
+static unsigned long timestamp_hz;
+
+
+/*
+ * register/unregister diskdump operations
+ */
+int diskdump_register_ops(struct disk_dump_ops* op)
+{
+ down(&dump_ops_mutex);
+ if (dump_ops) {
+ up(&dump_ops_mutex);
+ return -EEXIST;
+ }
+ dump_ops = op;
+ up(&dump_ops_mutex);
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(diskdump_register_ops);
+
+void diskdump_unregister_ops(void)
+{
+ down(&dump_ops_mutex);
+ dump_ops = NULL;
+ up(&dump_ops_mutex);
+}
+
+EXPORT_SYMBOL_GPL(diskdump_unregister_ops);
+
+
+/*
+ * sysfs interface
+ */
+static struct gendisk *device_to_gendisk(struct device *dev)
+{
+ struct dentry *d;
+ struct qstr qstr;
+
+ /* trace symlink to "block" */
+ qstr.name = "block";
+ qstr.len = strlen(qstr.name);
+ qstr.hash = full_name_hash(qstr.name, qstr.len);
+ d = d_lookup(dev->kobj.dentry, &qstr);
+ if (!d || !d->d_fsdata)
+ return NULL;
+ else
+ return container_of(d->d_fsdata, struct gendisk, kobj);
+}
+
+ssize_t diskdump_sysfs_store(struct device *dev, const char *buf, size_t count)
+{
+ struct gendisk *disk;
+ struct block_device *bdev;
+ int part, remove = 0;
+
+ if (!dump_ops || !dump_ops->add_dump || !dump_ops->remove_dump)
+ return count;
+
+ /* get partition number */
+ sscanf (buf, "%d\n", &part);
+ if (part < 0) {
+ part = -part;
+ remove = 1;
+ }
+
+ /* get block device */
+ if (!(disk = device_to_gendisk(dev)) ||
+ !(bdev = bdget_disk(disk, part)))
+ return count;
+
+ /* add/remove device */
+ down(&dump_ops_mutex);
+ if (!remove)
+ dump_ops->add_dump(dev, bdev);
+ else
+ dump_ops->remove_dump(bdev);
+ up(&dump_ops_mutex);
+
+ return count;
+}
+
+EXPORT_SYMBOL_GPL(diskdump_sysfs_store);
+
+ssize_t diskdump_sysfs_show(struct device *dev, char *buf)
+{
+ struct gendisk *disk;
+ struct block_device *bdev;
+ int part, tmp, len = 0, maxlen = 1024;
+ char* p = buf;
+ char name[BDEVNAME_SIZE];
+
+ if (!dump_ops || !dump_ops->find_dump)
+ return 0;
+
+ /* get gendisk */
+ disk = device_to_gendisk(dev);
+ if (!disk || !disk->part)
+ return 0;
+
+ /* print device */
+ down(&dump_ops_mutex);
+ for (part = 0; part < disk->minors - 1; part++) {
+ bdev = bdget_disk(disk, part);
+ if (dump_ops->find_dump(bdev)) {
+ tmp = sprintf(p, "%s\n", bdevname(bdev, name));
+ len += tmp;
+ p += tmp;
+ }
+ bdput(bdev);
+ if(len >= maxlen)
+ break;
+ }
+ up(&dump_ops_mutex);
+
+ return len;
+}
+
+EXPORT_SYMBOL_GPL(diskdump_sysfs_show);
+
+/*
+ * run timer/tasklet/workqueue during dump
+ */
+void diskdump_setup_timestamp(void)
+{
+ unsigned long long t;
+
+ platform_timestamp(timestamp_base);
+ udelay(1000000/HZ);
+ platform_timestamp(t);
+ timestamp_hz = (unsigned long)(t - timestamp_base);
+ diskdump_update();
+}
+
+EXPORT_SYMBOL_GPL(diskdump_setup_timestamp);
+
+void diskdump_update(void)
+{
+ unsigned long long t;
+
+ touch_nmi_watchdog();
+
+ /* update jiffies */
+ platform_timestamp(t);
+ while (t > timestamp_base + timestamp_hz) {
+ timestamp_base += timestamp_hz;
+ jiffies++;
+ platform_timestamp(t);
+ }
+
+ dump_run_timers();
+ dump_run_tasklet();
+ dump_run_workqueue();
+}
+
+EXPORT_SYMBOL_GPL(diskdump_update);
+
+
+/*
+ * register/unregister hook
+ */
+int diskdump_register_hook(void (*dump_func) (struct pt_regs *))
+{
+ if (diskdump_func)
+ return -EEXIST;
+
+ diskdump_func = dump_func;
+
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(diskdump_register_hook);
+
+void diskdump_unregister_hook(void)
+{
+ diskdump_func = NULL;
+}
+
+EXPORT_SYMBOL_GPL(diskdump_unregister_hook);
+
+/*
+ * Try crashdump. Diskdump is first, netdump is second.
+ * We clear diskdump_func before call of diskdump_func, so
+ * If double panic would occur in diskdump, netdump can handle
+ * it.
+ */
+void try_crashdump(struct pt_regs *regs)
+{
+ void (*func)(struct pt_regs *);
+
+ if (diskdump_func) {
+ system_state = SYSTEM_DUMPING;
+ func = diskdump_func;
+ diskdump_func = NULL;
+ func(regs);
+ }
+}
diff -Nur linux-2.6.9.org/kernel/panic.c linux-2.6.9/kernel/panic.c
--- linux-2.6.9.org/kernel/panic.c 2004-10-19 06:55:28.000000000 +0900
+++ linux-2.6.9/kernel/panic.c 2004-11-26 20:13:17.798151803 +0900
@@ -60,6 +60,8 @@
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
+ if (crashdump_func())
+ BUG();
bust_spinlocks(0);

#ifdef CONFIG_SMP
diff -Nur linux-2.6.9.org/kernel/softirq.c linux-2.6.9/kernel/softirq.c
--- linux-2.6.9.org/kernel/softirq.c 2004-10-19 06:53:43.000000000 +0900
+++ linux-2.6.9/kernel/softirq.c 2004-11-26 20:13:17.798151803 +0900
@@ -319,6 +319,38 @@

EXPORT_SYMBOL(tasklet_kill);

+struct tasklet_head saved_tasklet;
+
+void dump_clear_tasklet(void)
+{
+ saved_tasklet.list = __get_cpu_var(tasklet_vec).list;
+ __get_cpu_var(tasklet_vec).list = NULL;
+}
+
+EXPORT_SYMBOL_GPL(dump_clear_tasklet);
+
+void dump_run_tasklet(void)
+{
+ struct tasklet_struct *list;
+
+ list = __get_cpu_var(tasklet_vec).list;
+ __get_cpu_var(tasklet_vec).list = NULL;
+
+ while (list) {
+ struct tasklet_struct *t = list;
+ list = list->next;
+
+ if (!atomic_read(&t->count) &&
+ (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)))
+ t->func(t->data);
+
+ t->next = __get_cpu_var(tasklet_vec).list;
+ __get_cpu_var(tasklet_vec).list = t;
+ }
+}
+
+EXPORT_SYMBOL_GPL(dump_run_tasklet);
+
void __init softirq_init(void)
{
open_softirq(TASKLET_SOFTIRQ, tasklet_action, NULL);
diff -Nur linux-2.6.9.org/kernel/timer.c linux-2.6.9/kernel/timer.c
--- linux-2.6.9.org/kernel/timer.c 2004-10-19 06:54:55.000000000 +0900
+++ linux-2.6.9/kernel/timer.c 2004-11-26 20:13:17.799128365 +0900
@@ -31,6 +31,8 @@
#include <linux/time.h>
#include <linux/jiffies.h>
#include <linux/cpu.h>
+#include <linux/delay.h>
+#include <linux/diskdump.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -432,8 +434,9 @@
static inline void __run_timers(tvec_base_t *base)
{
struct timer_list *timer;
+ unsigned long flags;

- spin_lock_irq(&base->lock);
+ spin_lock_irqsave(&base->lock, flags);
while (time_after_eq(jiffies, base->timer_jiffies)) {
struct list_head work_list = LIST_HEAD_INIT(work_list);
struct list_head *head = &work_list;
@@ -462,14 +465,14 @@
set_running_timer(base, timer);
smp_wmb();
timer->base = NULL;
- spin_unlock_irq(&base->lock);
+ spin_unlock_irqrestore(&base->lock, flags);
fn(data);
spin_lock_irq(&base->lock);
goto repeat;
}
}
set_running_timer(base, NULL);
- spin_unlock_irq(&base->lock);
+ spin_unlock_irqrestore(&base->lock, flags);
}

#ifdef CONFIG_NO_IDLE_HZ
@@ -1118,6 +1121,12 @@
struct timer_list timer;
unsigned long expire;

+ if (crashdump_mode()) {
+ diskdump_mdelay(timeout);
+ set_current_state(TASK_RUNNING);
+ return timeout;
+ }
+
switch (timeout)
{
case MAX_SCHEDULE_TIMEOUT:
@@ -1320,7 +1329,7 @@
return 0;
}

-static void __devinit init_timers_cpu(int cpu)
+static void /* __devinit */ init_timers_cpu(int cpu)
{
int j;
tvec_base_t *base;
@@ -1339,6 +1348,27 @@
base->timer_jiffies = jiffies;
}

+static tvec_base_t saved_tvec_base;
+
+void dump_clear_timers(void)
+{
+ tvec_base_t *base = &per_cpu(tvec_bases, smp_processor_id());
+
+ memcpy(&saved_tvec_base, base, sizeof(saved_tvec_base));
+ init_timers_cpu(smp_processor_id());
+}
+
+EXPORT_SYMBOL_GPL(dump_clear_timers);
+
+void dump_run_timers(void)
+{
+ tvec_base_t *base = &__get_cpu_var(tvec_bases);
+
+ __run_timers(base);
+}
+
+EXPORT_SYMBOL_GPL(dump_run_timers);
+
#ifdef CONFIG_HOTPLUG_CPU
static int migrate_timer_list(tvec_base_t *new_base, struct list_head *head)
{
@@ -1611,6 +1641,11 @@
{
unsigned long timeout = msecs_to_jiffies(msecs);

+ if (crashdump_mode()) {
+ while (msecs--) udelay(1000);
+ return;
+ }
+
while (timeout) {
set_current_state(TASK_UNINTERRUPTIBLE);
timeout = schedule_timeout(timeout);
diff -Nur linux-2.6.9.org/kernel/workqueue.c linux-2.6.9/kernel/workqueue.c
--- linux-2.6.9.org/kernel/workqueue.c 2004-10-19 06:55:29.000000000 +0900
+++ linux-2.6.9/kernel/workqueue.c 2004-11-26 20:13:17.800104928 +0900
@@ -444,6 +444,37 @@

}

+static struct cpu_workqueue_struct saved_cwq;
+
+void dump_clear_workqueue(void)
+{
+ int cpu = smp_processor_id();
+ struct cpu_workqueue_struct *cwq = keventd_wq->cpu_wq + cpu;
+
+ memcpy(&saved_cwq, cwq, sizeof(saved_cwq));
+ spin_lock_init(&cwq->lock);
+ INIT_LIST_HEAD(&cwq->worklist);
+ init_waitqueue_head(&cwq->more_work);
+ init_waitqueue_head(&cwq->work_done);
+}
+
+void dump_run_workqueue(void)
+{
+ struct cpu_workqueue_struct *cwq;
+
+ cwq = keventd_wq->cpu_wq + smp_processor_id();
+ while (!list_empty(&cwq->worklist)) {
+ struct work_struct *work = list_entry(cwq->worklist.next,
+ struct work_struct, entry);
+ void (*f) (void *) = work->func;
+ void *data = work->data;
+
+ list_del_init(cwq->worklist.next);
+ clear_bit(0, &work->pending);
+ f(data);
+ }
+}
+
#ifdef CONFIG_HOTPLUG_CPU
/* Take the work from this (downed) CPU. */
static void take_over_work(struct workqueue_struct *wq, unsigned int cpu)
@@ -527,3 +558,6 @@
EXPORT_SYMBOL(schedule_delayed_work);
EXPORT_SYMBOL(schedule_delayed_work_on);
EXPORT_SYMBOL(flush_scheduled_work);
+
+EXPORT_SYMBOL_GPL(dump_clear_workqueue);
+EXPORT_SYMBOL_GPL(dump_run_workqueue);