[PATCH 1/4][Diskdump]Update patches

Takao Indoh
2004-07-07T08:32:30Z

This is a patch for diskdump common layer.

diff -Nur linux-2.6.7.org/arch/i386/kernel/nmi.c linux-2.6.7/arch/i386/kernel/nmi.c
--- linux-2.6.7.org/arch/i386/kernel/nmi.c 2004-06-22 10:27:16.000000000 +0900
+++ linux-2.6.7/arch/i386/kernel/nmi.c 2004-07-07 14:16:22.000000000 +0900
@@ -524,3 +524,4 @@
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-2.6.7.org/arch/i386/kernel/reboot.c linux-2.6.7/arch/i386/kernel/reboot.c
--- linux-2.6.7.org/arch/i386/kernel/reboot.c 2004-06-22 10:27:16.000000000 +0900
+++ linux-2.6.7/arch/i386/kernel/reboot.c 2004-07-07 14:16:22.000000000 +0900
@@ -252,7 +252,8 @@
* 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-2.6.7.org/arch/i386/kernel/smp.c linux-2.6.7/arch/i386/kernel/smp.c
--- linux-2.6.7.org/arch/i386/kernel/smp.c 2004-06-22 10:27:16.000000000 +0900
+++ linux-2.6.7/arch/i386/kernel/smp.c 2004-07-07 14:16:22.000000000 +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-2.6.7.org/arch/i386/kernel/traps.c linux-2.6.7/arch/i386/kernel/traps.c
--- linux-2.6.7.org/arch/i386/kernel/traps.c 2004-06-22 10:27:16.000000000 +0900
+++ linux-2.6.7/arch/i386/kernel/traps.c 2004-07-07 14:16:22.000000000 +0900
@@ -294,6 +294,7 @@
}

spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;

void die(const char * str, struct pt_regs * regs, long err)
{
@@ -301,7 +302,13 @@
int nl = 0;

console_verbose();
- spin_lock_irq(&die_lock);
+ local_irq_disable();
+ if (!spin_trylock(&die_lock)) {
+ if (smp_processor_id() != die_owner)
+ spin_lock(&die_lock);
+ /* allow recursive die to fall through */
+ }
+ die_owner = smp_processor_id();
bust_spinlocks(1);
handle_BUG(regs);
printk(KERN_ALERT "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
@@ -320,7 +327,9 @@
if (nl)
printk("\n");
show_registers(regs);
+ try_crashdump(regs);
bust_spinlocks(0);
+ die_owner = -1;
spin_unlock_irq(&die_lock);
if (in_interrupt())
panic("Fatal exception in interrupt");
diff -Nur linux-2.6.7.org/arch/i386/mm/init.c linux-2.6.7/arch/i386/mm/init.c
--- linux-2.6.7.org/arch/i386/mm/init.c 2004-06-22 10:27:17.000000000 +0900
+++ linux-2.6.7/arch/i386/mm/init.c 2004-07-07 14:16:22.000000000 +0900
@@ -168,7 +168,7 @@

extern int is_available_memory(efi_memory_desc_t *);

-static inline int page_is_ram(unsigned long pagenr)
+int page_is_ram(unsigned long pagenr)
{
int i;
unsigned long addr, end;
@@ -205,6 +205,7 @@
}
return 0;
}
+EXPORT_SYMBOL(page_is_ram);

#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
diff -Nur linux-2.6.7.org/drivers/block/Kconfig linux-2.6.7/drivers/block/Kconfig
--- linux-2.6.7.org/drivers/block/Kconfig 2004-06-22 10:27:42.000000000 +0900
+++ linux-2.6.7/drivers/block/Kconfig 2004-07-07 14:16:22.000000000 +0900
@@ -347,6 +347,11 @@
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"
+ ---help---
+ Disk dump support.
+
source "drivers/s390/block/Kconfig"

endmenu
diff -Nur linux-2.6.7.org/drivers/block/Makefile linux-2.6.7/drivers/block/Makefile
--- linux-2.6.7.org/drivers/block/Makefile 2004-06-22 10:27:43.000000000 +0900
+++ linux-2.6.7/drivers/block/Makefile 2004-07-07 14:16:22.000000000 +0900
@@ -43,3 +43,4 @@
obj-$(CONFIG_VIODASD) += viodasd.o
obj-$(CONFIG_BLK_DEV_CARMEL) += carmel.o

+obj-$(CONFIG_DISKDUMP) += diskdump.o
diff -Nur linux-2.6.7.org/drivers/block/diskdump.c linux-2.6.7/drivers/block/diskdump.c
--- linux-2.6.7.org/drivers/block/diskdump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.7/drivers/block/diskdump.c 2004-07-07 14:16:22.000000000 +0900
@@ -0,0 +1,851 @@
+/*
+ * 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/file.h>
+#include <linux/reboot.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/highmem.h>
+#include <linux/utsname.h>
+#include <linux/console.h>
+#include <linux/smp_lock.h>
+#include <linux/nmi.h>
+#include <linux/genhd.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <linux/blkdev.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))
+
+static unsigned int fallback_on_err = 1;
+static unsigned int allow_risky_dumps = 1;
+static unsigned int block_order = 2;
+static int sample_rate = 8;
+module_param(fallback_on_err, uint, 0);
+module_param(allow_risky_dumps, uint, 0);
+module_param(block_order, uint, 0);
+module_param(sample_rate, int, 0);
+
+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);
+
+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 */
+
+struct notifier_block *disk_dump_notifier_list;
+EXPORT_SYMBOL(disk_dump_notifier_list);
+
+unsigned long volatile diskdump_base_jiffies;
+
+extern int panic_timeout;
+extern unsigned long max_pfn;
+
+#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;
+
+ 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;
+
+ 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;
+
+ 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 IDX2PAGENR(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;
+ int bit, byte;
+ int ret = 0;
+ unsigned char val;
+
+ for (nr = 0; nr < bitmap_blocks; nr++) {
+ for (byte = 0; byte < PAGE_SIZE; byte++) {
+ val = 0;
+ for (bit = 0; bit < 8; bit++)
+ if (page_is_ram(IDX2PAGENR(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 int nr;
+ int ret = 0;
+ int blk_in_chunk = 0;
+
+ for (nr = 0; nr < max_pfn; nr++) {
+ print_status(blocks, max_blocks_written);
+
+ if (!page_is_ram(nr))
+ continue;
+
+ 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);
+ kaddr = (char *)kmap_atomic(page, KM_DISKDUMP);
+ /*
+ * need to copy because adapter drivers use virt_to_bus()
+ */
+ memcpy(scratch + blk_in_chunk * PAGE_SIZE, kaddr, PAGE_SIZE);
+ blk_in_chunk++;
+ blocks++;
+ kunmap_atomic(kaddr, KM_DISKDUMP);
+
+ 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 void disk_dump(struct pt_regs *regs, void *platform_arg)
+{
+ unsigned long flags;
+ int ret = -EIO;
+ struct pt_regs myregs;
+ unsigned int max_written_blocks, written_blocks;
+ int i;
+ struct disk_dump_device *dump_device = NULL;
+ struct disk_dump_partition *dump_part = NULL;
+
+ /* 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;
+ }
+
+ diskdump_mode = 1;
+
+ Dbg("notify dump start.");
+ notifier_call_chain(&disk_dump_notifier_list, 0, NULL);
+
+ dump_header.tasks[smp_processor_id()] = current;
+#if CONFIG_SMP
+ smp_call_function(freeze_cpu, NULL, 1, 0);
+ 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
+ mdelay(1000);
+#endif
+
+ /*
+ * 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);
+
+ ret = 0;
+
+done:
+ Dbg("do adapter shutdown.");
+ if (dump_device && dump_device->ops.shutdown)
+ if (dump_device->ops.shutdown(dump_device))
+ Err("adapter shutdown failed.");
+
+ /*
+ * If diskdump failed and fallback_on_err is set,
+ * We just return and leave panic to netdump.
+ */
+ if (fallback_on_err && ret != 0)
+ return;
+
+ Dbg("notify panic.");
+ notifier_call_chain(&panic_notifier_list, 0, NULL);
+
+ /* Resotre original jiffies. */
+ jiffies = diskdump_base_jiffies;
+
+ if (panic_timeout > 0) {
+ int i;
+
+ printk(KERN_EMERG "Rebooting in %d second%s..",
+ panic_timeout, "s" + (panic_timeout == 1));
+ for (i = 0; i < panic_timeout; i++) {
+ touch_nmi_watchdog();
+ mdelay(1000);
+ }
+ printk("\n");
+ machine_restart(NULL);
+ }
+ printk(KERN_EMERG "halt\n");
+ for (;;) {
+ touch_nmi_watchdog();
+ machine_halt();
+ mdelay(1000);
+ }
+}
+
+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;
+}
+
+/*
+ * 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 disk_dump_device *device, struct block_device *bdev)
+{
+ int ret;
+ struct disk_dump_device *dump_device;
+
+ if ((ret = blkdev_get(bdev, FMODE_READ, 0)) < 0) {
+ kfree(device);
+ return ret;
+ }
+
+ /* Check whether this block device is already registered */
+ if (find_dump_partition(bdev)) {
+ kfree(device);
+ blkdev_put(bdev);
+ return -EEXIST;
+ }
+
+ /* Check whether this device is already registered */
+ dump_device = find_dump_device(device);
+ if (dump_device == NULL) {
+ dump_device = device;
+ list_add(&dump_device->list, &disk_dump_devices);
+ }
+ else
+ kfree(device);
+
+ ret = add_dump_partition(dump_device, bdev);
+ if (ret < 0 && list_empty(&dump_device->list)) {
+ list_del(&dump_device->list);
+ kfree(dump_device);
+ 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;
+
+ 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)) {
+ list_del(&dump_device->list);
+ kfree(dump_device);
+ }
+
+ return 0;
+}
+
+int register_disk_dump_device(struct disk_dump_device *device, struct block_device *bdev)
+{
+ int ret;
+
+ down(&disk_dump_mutex);
+ ret = add_dump(device, bdev);
+ set_crc_modules();
+ up(&disk_dump_mutex);
+
+ return ret;
+}
+
+EXPORT_SYMBOL(register_disk_dump_device);
+
+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;
+}
+
+EXPORT_SYMBOL(unregister_disk_dump_device);
+
+static inline 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 print_disk_dump_device(struct device *dev, char *buf)
+{
+ int part, result, tmp;
+ struct gendisk *disk;
+ struct block_device *bdev;
+ int len = 0, maxlen = 1024;
+ char* p = buf;
+ char name[BDEVNAME_SIZE];
+
+ disk = device_to_gendisk(dev);
+ if (!disk || !disk->part)
+ return snprintf(buf, 20, "Error\n");
+
+ for (part = 0; part < disk->minors - 1; part++) {
+ bdev = bdget_disk(disk, part);
+ result = find_disk_dump_device(bdev);
+ if (result) {
+ tmp = sprintf(p, "%s\n", bdevname(bdev, name));
+ len += tmp;
+ p += tmp;
+ }
+ bdput(bdev);
+ if(len >= maxlen)
+ break;
+ }
+
+ return len;
+}
+
+EXPORT_SYMBOL_GPL(print_disk_dump_device);
+
+static void compute_total_blocks(void)
+{
+ unsigned int 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 = 0; nr < max_pfn; nr++) {
+ if (page_is_ram(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);
+}
+
+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(disk_dump)) {
+ Err("failed to register hooks.");
+ return -1;
+ }
+
+ compute_total_blocks();
+
+ platform_timestamp(t0);
+ mdelay(1);
+ platform_timestamp(t1);
+ timestamp_1sec = (unsigned long)(t1 - t0) * 1000;
+
+ return 0;
+}
+
+static void cleanup_diskdump(void)
+{
+ Info("shut down.");
+ diskdump_unregister_hook();
+ free_pages((unsigned long)scratch, block_order);
+}
+
+module_init(init_diskdump);
+module_exit(cleanup_diskdump);
+
+MODULE_LICENSE("GPL");
+
diff -Nur linux-2.6.7.org/drivers/char/sysrq.c linux-2.6.7/drivers/char/sysrq.c
--- linux-2.6.7.org/drivers/char/sysrq.c 2004-06-22 10:27:55.000000000 +0900
+++ linux-2.6.7/drivers/char/sysrq.c 2004-07-07 14:16:22.000000000 +0900
@@ -107,6 +107,19 @@
.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 +248,7 @@
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-2.6.7.org/include/asm-i386/diskdump.h linux-2.6.7/include/asm-i386/diskdump.h
--- linux-2.6.7.org/include/asm-i386/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.7/include/asm-i386/diskdump.h 2004-07-07 14:16:22.000000000 +0900
@@ -0,0 +1,82 @@
+#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>
+
+extern int page_is_ram(unsigned long);
+const static int platform_supports_diskdump = 1;
+
+#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; \
+}
+
+struct disk_dump_sub_header {
+ elf_gregset_t elf_regs;
+};
+
+#define platform_timestamp(x) rdtscll(x)
+
+#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; \
+})
+
+#define platform_freeze_cpu() \
+{ \
+ for (;;) local_irq_disable(); \
+}
+
+#define platform_start_diskdump(func, regs) \
+{ \
+ func(regs, NULL); \
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_I386_DISKDUMP_H */
diff -Nur linux-2.6.7.org/include/asm-i386/kmap_types.h linux-2.6.7/include/asm-i386/kmap_types.h
--- linux-2.6.7.org/include/asm-i386/kmap_types.h 2004-06-22 10:27:28.000000000 +0900
+++ linux-2.6.7/include/asm-i386/kmap_types.h 2004-07-07 14:16:22.000000000 +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_DISKDUMP,
+D(14) KM_TYPE_NR
};

#undef D
diff -Nur linux-2.6.7.org/include/linux/diskdump.h linux-2.6.7/include/linux/diskdump.h
--- linux-2.6.7.org/include/linux/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.7/include/linux/diskdump.h 2004-07-07 14:16:22.000000000 +0900
@@ -0,0 +1,165 @@
+#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/mount.h>
+#include <linux/dcache.h>
+#include <linux/blkdev.h>
+#include <linux/utsname.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
+
+/* Dump ioctls */
+#define BLKADDDUMPDEVICE 0xdf00 /* Add a dump device */
+#define BLKREMOVEDUMPDEVICE 0xdf01 /* Delete a dump device */
+
+int diskdump_register_hook(void (*dump_func)(struct pt_regs *, void *));
+void diskdump_unregister_hook(void);
+
+/*
+ * The handler that adapter driver provides for the common module of
+ * dump
+ */
+struct disk_dump_partition;
+struct disk_dump_device;
+
+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;
+ 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_device(struct disk_dump_device *, struct block_device *);
+int unregister_disk_dump_device(struct block_device *);
+int print_disk_dump_device(struct device *dev, char *buf);
+
+void diskdump_update(void);
+void diskdump_setup_timestamp(void);
+
+#define device_to_gendisk(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); \
+ (!d || !d->d_fsdata) ? \
+ NULL : \
+ container_of(d->d_fsdata, struct gendisk, kobj); \
+})
+
+
+/*
+ * 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];
+};
+
+/*
+ * 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-2.6.7.org/include/linux/interrupt.h linux-2.6.7/include/linux/interrupt.h
--- linux-2.6.7.org/include/linux/interrupt.h 2004-06-22 10:27:34.000000000 +0900
+++ linux-2.6.7/include/linux/interrupt.h 2004-07-07 14:16:22.000000000 +0900
@@ -246,4 +246,8 @@
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-2.6.7.org/include/linux/kernel.h linux-2.6.7/include/linux/kernel.h
--- linux-2.6.7.org/include/linux/kernel.h 2004-06-22 10:27:34.000000000 +0900
+++ linux-2.6.7/include/linux/kernel.h 2004-07-07 14:16:22.000000000 +0900
@@ -111,6 +111,11 @@
extern int panic_on_oops;
extern int tainted;
extern const char *print_tainted(void);
+struct pt_regs;
+extern void try_crashdump(struct pt_regs *);
+extern void (*diskdump_func) (struct pt_regs *regs, void *platform_arg);
+extern int diskdump_mode;
+#define crashdump_mode() unlikely(diskdump_mode)

/* Values used for system_state */
extern enum system_states {
@@ -139,6 +144,12 @@
#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-2.6.7.org/include/linux/timer.h linux-2.6.7/include/linux/timer.h
--- linux-2.6.7.org/include/linux/timer.h 2004-06-22 10:27:31.000000000 +0900
+++ linux-2.6.7/include/linux/timer.h 2004-07-07 14:16:22.000000000 +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-2.6.7.org/include/linux/workqueue.h linux-2.6.7/include/linux/workqueue.h
--- linux-2.6.7.org/include/linux/workqueue.h 2004-06-22 10:27:35.000000000 +0900
+++ linux-2.6.7/include/linux/workqueue.h 2004-07-07 14:16:22.000000000 +0900
@@ -84,4 +84,7 @@
return ret;
}

+extern void dump_clear_workqueue(void);
+extern void dump_run_workqueue(void);
+
#endif
diff -Nur linux-2.6.7.org/kernel/dump.c linux-2.6.7/kernel/dump.c
--- linux-2.6.7.org/kernel/dump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.7/kernel/dump.c 2004-07-07 14:16:22.000000000 +0900
@@ -0,0 +1,121 @@
+/*
+ * 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>
+
+int diskdump_mode = 0;
+EXPORT_SYMBOL_GPL(diskdump_mode);
+
+void (*diskdump_func) (struct pt_regs *regs, void *platform_arg) = NULL;
+EXPORT_SYMBOL_GPL(diskdump_func);
+
+static unsigned long long timestamp_base;
+static unsigned long timestamp_hz;
+
+/*
+ * 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 *, void *))
+{
+ 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 *, void *);
+
+ if (diskdump_func) {
+ func = diskdump_func;
+ diskdump_func = NULL;
+ platform_start_diskdump(func, regs);
+ }
+ if (panic_on_oops)
+ panic("Fatal exception");
+}
+
diff -Nur linux-2.6.7.org/kernel/panic.c linux-2.6.7/kernel/panic.c
--- linux-2.6.7.org/kernel/panic.c 2004-06-22 10:27:25.000000000 +0900
+++ linux-2.6.7/kernel/panic.c 2004-07-07 14:16:22.000000000 +0900
@@ -60,6 +60,8 @@
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
printk(KERN_EMERG "Kernel panic: %s\n",buf);
+ if (diskdump_func)
+ BUG();
if (in_interrupt())
printk(KERN_EMERG "In interrupt handler - not syncing\n");
else if (!current->pid)
diff -Nur linux-2.6.7.org/kernel/softirq.c linux-2.6.7/kernel/softirq.c
--- linux-2.6.7.org/kernel/softirq.c 2004-06-22 10:27:25.000000000 +0900
+++ linux-2.6.7/kernel/softirq.c 2004-07-07 14:16:22.000000000 +0900
@@ -314,6 +314,38 @@

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(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(dump_run_tasklet);
+
void __init softirq_init(void)
{
open_softirq(TASKLET_SOFTIRQ, tasklet_action, NULL);
diff -Nur linux-2.6.7.org/kernel/timer.c linux-2.6.7/kernel/timer.c
--- linux-2.6.7.org/kernel/timer.c 2004-06-22 10:27:25.000000000 +0900
+++ linux-2.6.7/kernel/timer.c 2004-07-07 14:16:22.000000000 +0900
@@ -31,6 +31,7 @@
#include <linux/time.h>
#include <linux/jiffies.h>
#include <linux/cpu.h>
+#include <linux/delay.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -423,8 +424,9 @@
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;
@@ -453,14 +455,14 @@
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
@@ -1105,6 +1107,12 @@
struct timer_list timer;
unsigned long expire;

+ if (crashdump_mode()) {
+ mdelay(timeout);
+ set_current_state(TASK_RUNNING);
+ return timeout;
+ }
+
switch (timeout)
{
case MAX_SCHEDULE_TIMEOUT:
@@ -1308,7 +1316,7 @@
return 0;
}

-static void __devinit init_timers_cpu(int cpu)
+static void /* __devinit */ init_timers_cpu(int cpu)
{
int j;
tvec_base_t *base;
@@ -1327,6 +1335,27 @@
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(dump_clear_timers);
+
+void dump_run_timers(void)
+{
+ tvec_base_t *base = &__get_cpu_var(tvec_bases);
+
+ __run_timers(base);
+}
+
+EXPORT_SYMBOL(dump_run_timers);
+
#ifdef CONFIG_HOTPLUG_CPU
static int migrate_timer_list(tvec_base_t *new_base, struct list_head *head)
{
diff -Nur linux-2.6.7.org/kernel/workqueue.c linux-2.6.7/kernel/workqueue.c
--- linux-2.6.7.org/kernel/workqueue.c 2004-06-22 10:27:25.000000000 +0900
+++ linux-2.6.7/kernel/workqueue.c 2004-07-07 14:16:22.000000000 +0900
@@ -424,6 +424,37 @@

}

+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)
@@ -507,3 +538,6 @@
EXPORT_SYMBOL(schedule_delayed_work);
EXPORT_SYMBOL(flush_scheduled_work);

+EXPORT_SYMBOL(dump_clear_workqueue);
+EXPORT_SYMBOL(dump_run_workqueue);
+
diff -Nur linux-2.6.7.org/mm/bootmem.c linux-2.6.7/mm/bootmem.c
--- linux-2.6.7.org/mm/bootmem.c 2004-06-22 10:28:05.000000000 +0900
+++ linux-2.6.7/mm/bootmem.c 2004-07-07 14:16:22.000000000 +0900
@@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
+#include <linux/module.h>
#include <asm/dma.h>
#include <asm/io.h>

@@ -26,6 +27,7 @@
unsigned long max_low_pfn;
unsigned long min_low_pfn;
unsigned long max_pfn;
+EXPORT_SYMBOL(max_pfn);

/* return the number of _pages_ that will be allocated for the boot bitmap */
unsigned long __init bootmem_bootmap_pages (unsigned long pages)