* [PATCH 0/4][diskdump] x86-64 support
@ 2004-08-28 9:43 Takao Indoh
2004-08-28 9:44 ` [PATCH 1/4][diskdump] " Takao Indoh
` (3 more replies)
0 siblings, 4 replies; 10+ messages in thread
From: Takao Indoh @ 2004-08-28 9:43 UTC (permalink / raw)
To: linux-kernel
Hi all,
Here is the latest diskdump patch for kernel 2.6.8.1.
- Supports x86_64
- Fix bug of Fusion-MPT scsi driver patch
- Add new functions for finding ram area
Source code can be downloaded from
http://sourceforge.net/projects/lkdump
When I tested diskdump on x86-64 machine, I found that memory dump of
the following two areas failed.
1) 04000000 - 07ffffff
2) around last two page
Memory dump of the area 2) failed because page->flag was broken.
So I compare PFN to page_to_pfn(pfn_to_page(PFN)) and skip this PFN
if these value is different.
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;
}
Memory dump of the area 1) failed because this area was not mapped to
vaddr. Diskdump checks page using page_is_ram() and maps it using
kmap_atomic(). In the area 1), both page_is_ram() and kmap_atomic()
return true, but page is not attached to the page table.
I think this area is AGP Aperture. I found this message in the dmesg.
PCI-DMA: Disabling AGP.
PCI-DMA: aperture base @ 4000000 size 65536 KB
PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
To resolve this problem, I check page using kern_addr_valid() before
kmap_atomic().
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);
memcpy(scratch + blk_in_chunk * PAGE_SIZE, kaddr, PAGE_SIZE);
kunmap_atomic(kaddr, KM_CRASHDUMP);
write:
Now diskdump seems to work correctly. But I am not sure these method is
right. Please let me know if there are better methods.
Best Regards,
Takao Indoh
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH 1/4][diskdump] x86-64 support
2004-08-28 9:43 [PATCH 0/4][diskdump] x86-64 support Takao Indoh
@ 2004-08-28 9:44 ` Takao Indoh
2004-08-28 9:45 ` [PATCH 2/4][diskdump] " Takao Indoh
` (2 subsequent siblings)
3 siblings, 0 replies; 10+ messages in thread
From: Takao Indoh @ 2004-08-28 9:44 UTC (permalink / raw)
To: linux-kernel
This is a patch for diskdump common layer.
diff -Nur linux-2.6.8.1.org/arch/i386/kernel/nmi.c linux-2.6.8.1/arch/i386/kernel/nmi.c
--- linux-2.6.8.1.org/arch/i386/kernel/nmi.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/i386/kernel/nmi.c 2004-08-26 20:32:58.186207721 +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-2.6.8.1.org/arch/i386/kernel/reboot.c linux-2.6.8.1/arch/i386/kernel/reboot.c
--- linux-2.6.8.1.org/arch/i386/kernel/reboot.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/i386/kernel/reboot.c 2004-08-26 20:32:58.186207721 +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-2.6.8.1.org/arch/i386/kernel/smp.c linux-2.6.8.1/arch/i386/kernel/smp.c
--- linux-2.6.8.1.org/arch/i386/kernel/smp.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/i386/kernel/smp.c 2004-08-26 20:32:58.187184284 +0900
@@ -519,7 +519,7 @@
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-2.6.8.1.org/arch/i386/kernel/traps.c linux-2.6.8.1/arch/i386/kernel/traps.c
--- linux-2.6.8.1.org/arch/i386/kernel/traps.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/i386/kernel/traps.c 2004-08-26 20:32:58.187184284 +0900
@@ -293,6 +293,7 @@
}
spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;
void die(const char * str, struct pt_regs * regs, long err)
{
@@ -300,7 +301,13 @@
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);
@@ -319,7 +326,9 @@
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-2.6.8.1.org/arch/i386/mm/init.c linux-2.6.8.1/arch/i386/mm/init.c
--- linux-2.6.8.1.org/arch/i386/mm/init.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/i386/mm/init.c 2004-08-26 20:32:58.188160846 +0900
@@ -185,7 +185,54 @@
extern int is_available_memory(efi_memory_desc_t *);
-static inline int page_is_ram(unsigned long pagenr)
+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);
+
+int page_is_ram(unsigned long pagenr)
{
int i;
unsigned long addr, end;
@@ -223,6 +270,8 @@
return 0;
}
+EXPORT_SYMBOL_GPL(page_is_ram);
+
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;
diff -Nur linux-2.6.8.1.org/arch/ia64/kernel/process.c linux-2.6.8.1/arch/ia64/kernel/process.c
--- linux-2.6.8.1.org/arch/ia64/kernel/process.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/ia64/kernel/process.c 2004-08-26 20:32:58.189137409 +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>
@@ -547,11 +548,13 @@
}
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(ia64_do_copy_regs);
+
void
do_dump_fpu (struct unw_frame_info *info, void *arg)
{
@@ -564,7 +567,7 @@
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);
@@ -576,7 +579,7 @@
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
@@ -765,3 +768,22 @@
}
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(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(ia64_start_dump);
diff -Nur linux-2.6.8.1.org/arch/ia64/kernel/smp.c linux-2.6.8.1/arch/ia64/kernel/smp.c
--- linux-2.6.8.1.org/arch/ia64/kernel/smp.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/ia64/kernel/smp.c 2004-08-26 20:32:58.189137409 +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-2.6.8.1.org/arch/ia64/kernel/traps.c linux-2.6.8.1/arch/ia64/kernel/traps.c
--- linux-2.6.8.1.org/arch/ia64/kernel/traps.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/ia64/kernel/traps.c 2004-08-26 20:32:58.190113971 +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-2.6.8.1.org/arch/ia64/mm/init.c linux-2.6.8.1/arch/ia64/mm/init.c
--- linux-2.6.8.1.org/arch/ia64/mm/init.c 2004-08-25 15:55:49.000000000 +0900
+++ linux-2.6.8.1/arch/ia64/mm/init.c 2004-08-26 20:32:58.190113971 +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-2.6.8.1.org/arch/x86_64/kernel/reboot.c linux-2.6.8.1/arch/x86_64/kernel/reboot.c
--- linux-2.6.8.1.org/arch/x86_64/kernel/reboot.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/arch/x86_64/kernel/reboot.c 2004-08-26 20:32:58.191090534 +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-2.6.8.1.org/arch/x86_64/kernel/smp.c linux-2.6.8.1/arch/x86_64/kernel/smp.c
--- linux-2.6.8.1.org/arch/x86_64/kernel/smp.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/arch/x86_64/kernel/smp.c 2004-08-26 20:32:58.191090534 +0900
@@ -405,7 +405,7 @@
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-2.6.8.1.org/arch/x86_64/kernel/traps.c linux-2.6.8.1/arch/x86_64/kernel/traps.c
--- linux-2.6.8.1.org/arch/x86_64/kernel/traps.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/arch/x86_64/kernel/traps.c 2004-08-28 14:15:24.375774680 +0900
@@ -359,6 +359,7 @@
printk(KERN_ALERT "RIP ");
printk_address(regs->rip);
printk(" RSP <%016lx>\n", regs->rsp);
+ try_crashdump(regs);
}
void die(const char * str, struct pt_regs * regs, long err)
diff -Nur linux-2.6.8.1.org/arch/x86_64/mm/init.c linux-2.6.8.1/arch/x86_64/mm/init.c
--- linux-2.6.8.1.org/arch/x86_64/mm/init.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/arch/x86_64/mm/init.c 2004-08-26 20:32:58.193043659 +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>
@@ -374,7 +375,36 @@
__flush_tlb_all();
}
-static inline int page_is_ram (unsigned long pagenr)
+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);
+
+int page_is_ram (unsigned long pagenr)
{
int i;
@@ -396,6 +426,8 @@
return 0;
}
+EXPORT_SYMBOL_GPL(page_is_ram);
+
static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
kcore_vsyscall;
@@ -548,6 +580,7 @@
return 0;
return pfn_valid(pte_pfn(*pte));
}
+EXPORT_SYMBOL_GPL(kern_addr_valid);
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
diff -Nur linux-2.6.8.1.org/drivers/block/Kconfig linux-2.6.8.1/drivers/block/Kconfig
--- linux-2.6.8.1.org/drivers/block/Kconfig 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/block/Kconfig 2004-08-26 20:32:58.193043659 +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-2.6.8.1.org/drivers/block/Makefile linux-2.6.8.1/drivers/block/Makefile
--- linux-2.6.8.1.org/drivers/block/Makefile 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/block/Makefile 2004-08-26 20:32:58.193043659 +0900
@@ -43,3 +43,4 @@
obj-$(CONFIG_VIODASD) += viodasd.o
obj-$(CONFIG_BLK_DEV_SX8) += sx8.o
+obj-$(CONFIG_DISKDUMP) += diskdump.o
diff -Nur linux-2.6.8.1.org/drivers/block/diskdump.c linux-2.6.8.1/drivers/block/diskdump.c
--- linux-2.6.8.1.org/drivers/block/diskdump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/drivers/block/diskdump.c 2004-08-26 20:32:58.195973346 +0900
@@ -0,0 +1,992 @@
+/*
+ * 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/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(disk_dump_notifier_list);
+
+unsigned long volatile diskdump_base_jiffies;
+void *diskdump_stack;
+
+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 < ULONG_MAX; 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);
+ 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
+ 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;
+ }
+
+ diskdump_mode = 1;
+
+ Dbg("notify dump start.");
+ notifier_call_chain(&disk_dump_notifier_list, 0, NULL);
+
+ 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 (fallback_on_err && dump_err)
+ return;
+
+ 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();
+ 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();
+ 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;
+}
+
+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(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(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 < ULONG_MAX; 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);
+ mdelay(1);
+ platform_timestamp(t1);
+ timestamp_1sec = (unsigned long)(t1 - t0) * 1000;
+
+ /*
+ * Allocate a separate stack for diskdump.
+ */
+ platform_init_stack(&diskdump_stack);
+
+ 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);
+}
+
+module_init(init_diskdump);
+module_exit(cleanup_diskdump);
+
+MODULE_LICENSE("GPL");
diff -Nur linux-2.6.8.1.org/drivers/char/sysrq.c linux-2.6.8.1/drivers/char/sysrq.c
--- linux-2.6.8.1.org/drivers/char/sysrq.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/char/sysrq.c 2004-08-26 20:32:58.195973346 +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-2.6.8.1.org/include/asm-generic/diskdump.h linux-2.6.8.1/include/asm-generic/diskdump.h
--- linux-2.6.8.1.org/include/asm-generic/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/asm-generic/diskdump.h 2004-08-26 20:32:58.196949908 +0900
@@ -0,0 +1,49 @@
+#ifndef _ASM_GENERIC_DISKDUMP_H_
+#define _ASM_GENERIC_DISKDUMP_H_
+
+/*
+ * linux/include/asm-generic/diskdump.h
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * 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__
+
+static inline int page_is_ram(unsigned long x) { return 0; }
+static inline unsigned long next_ram_page(unsigned long x) { return ULONG_MAX; }
+
+#warning diskdump is not supported on this platform
+const static int platform_supports_diskdump = 0;
+
+#define platform_fix_regs() do { } while (0)
+#define platform_timestamp(x) do { (x) = 0; } while (0)
+#define platform_freeze_cpu() do { } while (0)
+
+struct disk_dump_sub_header {};
+#define size_of_sub_header() 1
+#define write_sub_header() 1
+
+#define platform_init_stack(stackptr) do { } while (0)
+#define platform_cleanup_stack(stackptr) do { } while (0)
+#define platform_start_crashdump(stackptr,dumpfunc,regs) (0)
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_GENERIC_DISKDUMP_H */
diff -Nur linux-2.6.8.1.org/include/asm-i386/diskdump.h linux-2.6.8.1/include/asm-i386/diskdump.h
--- linux-2.6.8.1.org/include/asm-i386/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/asm-i386/diskdump.h 2004-08-28 14:30:43.848419667 +0900
@@ -0,0 +1,91 @@
+#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/irq.h>
+
+extern int page_is_ram(unsigned long);
+extern unsigned long next_ram_page (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(); \
+}
+
+typedef asmlinkage void (*crashdump_func_t)(struct pt_regs *, void *);
+
+#define platform_init_stack(stackptr) do { } while (0)
+#define platform_cleanup_stack(stackptr) do { } while (0)
+
+static inline void platform_start_crashdump(void *stackptr,
+ crashdump_func_t dumpfunc,
+ struct pt_regs *regs)
+{
+ dumpfunc(regs, NULL);
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_I386_DISKDUMP_H */
diff -Nur linux-2.6.8.1.org/include/asm-i386/kmap_types.h linux-2.6.8.1/include/asm-i386/kmap_types.h
--- linux-2.6.8.1.org/include/asm-i386/kmap_types.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/asm-i386/kmap_types.h 2004-08-26 20:32:58.197926471 +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-2.6.8.1.org/include/asm-ia64/diskdump.h linux-2.6.8.1/include/asm-ia64/diskdump.h
--- linux-2.6.8.1.org/include/asm-ia64/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/asm-ia64/diskdump.h 2004-08-26 20:32:58.197926471 +0900
@@ -0,0 +1,100 @@
+#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/unwind.h>
+#include <asm/ptrace.h>
+
+extern void ia64_do_copy_regs(struct unw_frame_info *, void *arg);
+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);
+
+const static int platform_supports_diskdump = 1;
+
+
+#define platform_fix_regs() \
+{ \
+ struct unw_frame_info *info = platform_arg; \
+ \
+ current->thread.ksp = (__u64)info->sw - 16; \
+ myregs = *regs; \
+}
+
+#define platform_timestamp(x) ({ x = ia64_get_itc(); })
+
+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; \
+})
+
+#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, ¶m);
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_DISKDUMP_H */
diff -Nur linux-2.6.8.1.org/include/asm-ppc64/diskdump.h linux-2.6.8.1/include/asm-ppc64/diskdump.h
--- linux-2.6.8.1.org/include/asm-ppc64/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/asm-ppc64/diskdump.h 2004-08-26 20:32:58.198903033 +0900
@@ -0,0 +1,6 @@
+#ifndef _ASM_PPC64_DISKDUMP_H_
+#define _ASM_PPC64_DISKDUMP_H_
+
+#include <asm-generic/diskdump.h>
+
+#endif /* _ASM_PPC64_DISKDUMP_H_ */
diff -Nur linux-2.6.8.1.org/include/asm-s390/diskdump.h linux-2.6.8.1/include/asm-s390/diskdump.h
--- linux-2.6.8.1.org/include/asm-s390/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/asm-s390/diskdump.h 2004-08-26 20:32:58.198903033 +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-2.6.8.1.org/include/asm-x86_64/diskdump.h linux-2.6.8.1/include/asm-x86_64/diskdump.h
--- linux-2.6.8.1.org/include/asm-x86_64/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/asm-x86_64/diskdump.h 2004-08-28 14:18:43.281045681 +0900
@@ -0,0 +1,82 @@
+/*
+ * 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>
+
+extern int page_is_ram(unsigned long);
+extern unsigned long next_ram_page(unsigned long);
+const static int platform_supports_diskdump = 1;
+
+#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)
+
+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; \
+})
+
+#define platform_freeze_cpu() \
+{ \
+ for (;;) { \
+ local_irq_disable(); \
+ touch_nmi_watchdog(); \
+ } \
+}
+
+#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); \
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_X86_64_DISKDUMP_H */
diff -Nur linux-2.6.8.1.org/include/asm-x86_64/kmap_types.h linux-2.6.8.1/include/asm-x86_64/kmap_types.h
--- linux-2.6.8.1.org/include/asm-x86_64/kmap_types.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/asm-x86_64/kmap_types.h 2004-08-26 20:32:58.199879596 +0900
@@ -13,6 +13,7 @@
KM_IRQ1,
KM_SOFTIRQ0,
KM_SOFTIRQ1,
+ KM_CRASHDUMP,
KM_TYPE_NR
};
diff -Nur linux-2.6.8.1.org/include/linux/diskdump.h linux-2.6.8.1/include/linux/diskdump.h
--- linux-2.6.8.1.org/include/linux/diskdump.h 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/include/linux/diskdump.h 2004-08-26 20:32:58.199879596 +0900
@@ -0,0 +1,174 @@
+#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>
+
+/* 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);
+
+
+/*
+ * 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-2.6.8.1.org/include/linux/interrupt.h linux-2.6.8.1/include/linux/interrupt.h
--- linux-2.6.8.1.org/include/linux/interrupt.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/linux/interrupt.h 2004-08-26 20:32:58.200856158 +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-2.6.8.1.org/include/linux/kernel.h linux-2.6.8.1/include/linux/kernel.h
--- linux-2.6.8.1.org/include/linux/kernel.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/linux/kernel.h 2004-08-26 20:32:58.200856158 +0900
@@ -130,6 +130,12 @@
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);
+extern int diskdump_mode;
+#define crashdump_mode() unlikely(diskdump_mode)
+
/* Values used for system_state */
extern enum system_states {
@@ -138,6 +144,7 @@
SYSTEM_HALT,
SYSTEM_POWER_OFF,
SYSTEM_RESTART,
+ SYSTEM_DUMPING,
} system_state;
#define TAINT_PROPRIETARY_MODULE (1<<0)
@@ -158,6 +165,12 @@
#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-2.6.8.1.org/include/linux/timer.h linux-2.6.8.1/include/linux/timer.h
--- linux-2.6.8.1.org/include/linux/timer.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/linux/timer.h 2004-08-26 20:32:58.200856158 +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-2.6.8.1.org/include/linux/workqueue.h linux-2.6.8.1/include/linux/workqueue.h
--- linux-2.6.8.1.org/include/linux/workqueue.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/linux/workqueue.h 2004-08-26 20:32:58.201832721 +0900
@@ -84,4 +84,7 @@
return ret;
}
+extern void dump_clear_workqueue(void);
+extern void dump_run_workqueue(void);
+
#endif
diff -Nur linux-2.6.8.1.org/kernel/Makefile linux-2.6.8.1/kernel/Makefile
--- linux-2.6.8.1.org/kernel/Makefile 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/kernel/Makefile 2004-08-26 20:32:58.201832721 +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-2.6.8.1.org/kernel/dump.c linux-2.6.8.1/kernel/dump.c
--- linux-2.6.8.1.org/kernel/dump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/kernel/dump.c 2004-08-26 20:32:58.203785846 +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-2.6.8.1.org/kernel/panic.c linux-2.6.8.1/kernel/panic.c
--- linux-2.6.8.1.org/kernel/panic.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/kernel/panic.c 2004-08-26 20:32:58.204762408 +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-2.6.8.1.org/kernel/softirq.c linux-2.6.8.1/kernel/softirq.c
--- linux-2.6.8.1.org/kernel/softirq.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/kernel/softirq.c 2004-08-26 20:32:58.204762408 +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-2.6.8.1.org/kernel/timer.c linux-2.6.8.1/kernel/timer.c
--- linux-2.6.8.1.org/kernel/timer.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/kernel/timer.c 2004-08-26 20:32:58.205738971 +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-2.6.8.1.org/kernel/workqueue.c linux-2.6.8.1/kernel/workqueue.c
--- linux-2.6.8.1.org/kernel/workqueue.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/kernel/workqueue.c 2004-08-26 20:32:58.206715533 +0900
@@ -424,6 +424,37 @@
}
+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)
@@ -507,3 +538,6 @@
EXPORT_SYMBOL(schedule_delayed_work);
EXPORT_SYMBOL(flush_scheduled_work);
+EXPORT_SYMBOL(dump_clear_workqueue);
+EXPORT_SYMBOL(dump_run_workqueue);
+
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH 2/4][diskdump] x86-64 support
2004-08-28 9:43 [PATCH 0/4][diskdump] x86-64 support Takao Indoh
2004-08-28 9:44 ` [PATCH 1/4][diskdump] " Takao Indoh
@ 2004-08-28 9:45 ` Takao Indoh
2004-08-28 10:21 ` Christoph Hellwig
2004-08-28 9:47 ` [PATCH 3/4][diskdump] " Takao Indoh
2004-08-28 9:48 ` [PATCH 4/4][diskdump] " Takao Indoh
3 siblings, 1 reply; 10+ messages in thread
From: Takao Indoh @ 2004-08-28 9:45 UTC (permalink / raw)
To: linux-kernel
This is a patch for scsi common layer.
diff -Nur linux-2.6.8.1.org/drivers/scsi/Kconfig linux-2.6.8.1/drivers/scsi/Kconfig
--- linux-2.6.8.1.org/drivers/scsi/Kconfig 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/Kconfig 2004-08-26 13:56:42.153485508 +0900
@@ -55,6 +55,12 @@
In this case, do not compile the driver for your SCSI host adapter
(below) as a module either.
+config SCSI_DUMP
+ tristate "SCSI dump support"
+ depends on DISKDUMP && SCSI
+ help
+ SCSI dump support
+
config CHR_DEV_ST
tristate "SCSI tape support"
depends on SCSI
diff -Nur linux-2.6.8.1.org/drivers/scsi/Makefile linux-2.6.8.1/drivers/scsi/Makefile
--- linux-2.6.8.1.org/drivers/scsi/Makefile 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/Makefile 2004-08-26 13:56:42.154462071 +0900
@@ -137,6 +137,8 @@
obj-$(CONFIG_BLK_DEV_SR) += sr_mod.o
obj-$(CONFIG_CHR_DEV_SG) += sg.o
+obj-$(CONFIG_SCSI_DUMP) += scsi_dump.o
+
scsi_mod-y += scsi.o hosts.o scsi_ioctl.o constants.o \
scsicam.o scsi_error.o scsi_lib.o \
scsi_scan.o scsi_syms.o scsi_sysfs.o \
diff -Nur linux-2.6.8.1.org/drivers/scsi/scsi.c linux-2.6.8.1/drivers/scsi/scsi.c
--- linux-2.6.8.1.org/drivers/scsi/scsi.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/scsi.c 2004-08-26 13:56:42.155438633 +0900
@@ -714,6 +714,9 @@
{
unsigned long flags;
+ if (crashdump_mode())
+ return;
+
/*
* Set the serial numbers back to zero
*/
diff -Nur linux-2.6.8.1.org/drivers/scsi/scsi_dump.c linux-2.6.8.1/drivers/scsi/scsi_dump.c
--- linux-2.6.8.1.org/drivers/scsi/scsi_dump.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/scsi_dump.c 2004-08-26 13:57:19.085125681 +0900
@@ -0,0 +1,598 @@
+/*
+ * linux/drivers/scsi/scsi_dump.c
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Written by Nobuhiro Tachino (ntachino@jp.fujitsu.com)
+ *
+ * Some codes are derived from drivers/scsi/sd.c
+ */
+/*
+ * 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/module.h>
+
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+
+#include <linux/genhd.h>
+#include <linux/utsname.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/diskdump.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+
+#include "scsi_priv.h"
+
+/*
+ * Fixme: Legacy dma direction interfaces.
+ */
+#define SCSI_DATA_UNKNOWN (DMA_BIDIRECTIONAL)
+#define SCSI_DATA_WRITE (DMA_TO_DEVICE)
+#define SCSI_DATA_READ (DMA_FROM_DEVICE)
+#define SCSI_DATA_NONE (DMA_NONE)
+
+#define MAX_RETRIES 5
+#define SD_TIMEOUT (60 * HZ)
+
+#define Dbg(x, ...) pr_debug("scsi_dump: " x "\n", ## __VA_ARGS__)
+#define Err(x, ...) pr_err ("scsi_dump: " x "\n", ## __VA_ARGS__)
+#define Warn(x, ...) pr_warn ("scsi_dump: " x "\n", ## __VA_ARGS__)
+#define Info(x, ...) pr_info ("scsi_dump: " x "\n", ## __VA_ARGS__)
+
+/* blocks to 512byte sectors */
+#define BLOCK_SECTOR(s) ((s) << (DUMP_BLOCK_SHIFT - 9))
+
+static int quiesce_ok = 0;
+static struct scsi_cmnd scsi_dump_cmnd;
+static struct request scsi_dump_req;
+static uint32_t module_crc;
+
+static void rw_intr(struct scsi_cmnd * scmd)
+{
+ del_timer(&scmd->eh_timeout);
+ scmd->done = NULL;
+}
+
+static void eh_timeout(unsigned long data)
+{
+}
+
+/*
+ * Common code to make Scsi_Cmnd
+ */
+static void init_scsi_command(struct scsi_device *sdev, struct scsi_cmnd *scmd,
+ void *buf, int len, unsigned char direction,
+ int set_lun)
+{
+ scmd->request = &scsi_dump_req;
+ scmd->sc_magic = SCSI_CMND_MAGIC;
+ scmd->owner = SCSI_OWNER_MIDLEVEL;
+ scmd->device = sdev;
+ scmd->buffer = scmd->request_buffer = buf;
+ scmd->bufflen = scmd->request_bufflen = len;
+
+
+ scmd->sc_data_direction = direction;
+
+ memcpy(scmd->data_cmnd, scmd->cmnd, sizeof(scmd->cmnd));
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+ scmd->old_cmd_len = scmd->cmd_len;
+
+
+ if (set_lun)
+ scmd->cmnd[1] |= (sdev->scsi_level <= SCSI_2) ?
+ ((sdev->lun << 5) & 0xe0) : 0;
+
+ scmd->transfersize = sdev->sector_size;
+ if (direction == SCSI_DATA_WRITE)
+ scmd->underflow = len;
+
+ scmd->allowed = MAX_RETRIES;
+ scmd->timeout_per_command = SD_TIMEOUT;
+
+ /*
+ * This is the completion routine we use. This is matched in terms
+ * of capability to this function.
+ */
+ scmd->done = rw_intr;
+
+ /*
+ * Some low driver put eh_timeout into the timer list.
+ */
+ init_timer(&scmd->eh_timeout);
+ scmd->eh_timeout.data = (unsigned long)scmd;
+ scmd->eh_timeout.function = eh_timeout;
+}
+
+/* MODE SENSE */
+static void init_mode_sense_command(struct scsi_device *sdev,
+ struct scsi_cmnd *scmd, void *buf)
+{
+ memset(scmd, 0, sizeof(*scmd));
+ scmd->cmnd[0] = MODE_SENSE;
+ scmd->cmnd[1] = 0x00; /* DBD=0 */
+ scmd->cmnd[2] = 0x08; /* PCF=0 Page 8(Cache) */
+ scmd->cmnd[4] = 255;
+
+ init_scsi_command(sdev, scmd, buf, 256, SCSI_DATA_READ, 1);
+}
+
+/* MODE SELECT */
+static void init_mode_select_command(struct scsi_device *sdev,
+ struct scsi_cmnd *scmd, void *buf, int len)
+{
+ memset(scmd, 0, sizeof(*scmd));
+ scmd->cmnd[0] = MODE_SELECT;
+ scmd->cmnd[1] = 0x10; /* PF=1 SP=0 */
+ scmd->cmnd[4] = len;
+
+ init_scsi_command(sdev, scmd, buf, len, SCSI_DATA_WRITE, 1);
+}
+
+/* SYNCHRONIZE CACHE */
+static void init_sync_command(struct scsi_device *sdev, struct scsi_cmnd * scmd)
+{
+ memset(scmd, 0, sizeof(*scmd));
+ scmd->cmnd[0] = SYNCHRONIZE_CACHE;
+
+ init_scsi_command(sdev, scmd, NULL, 0, SCSI_DATA_NONE, 0);
+}
+
+/* REQUEST SENSE */
+static void init_sense_command(struct scsi_device *sdev, struct scsi_cmnd *scmd,
+ void *buf)
+{
+ memset(scmd, 0, sizeof(*scmd));
+ scmd->cmnd[0] = REQUEST_SENSE;
+ scmd->cmnd[4] = 255;
+
+ init_scsi_command(sdev, scmd, buf, 256, SCSI_DATA_READ, 1);
+}
+
+/* READ/WRITE */
+static int init_rw_command(struct disk_dump_partition *dump_part,
+ struct scsi_device *sdev, struct scsi_cmnd * scmd,
+ int rw, int block, void *buf, unsigned int len)
+{
+ int this_count = len >> 9;
+
+ memset(scmd, 0, sizeof(*scmd));
+
+ if (block + this_count > dump_part->nr_sects) {
+ Err("block number %d is larger than %lu",
+ block + this_count, dump_part->nr_sects);
+ return -EFBIG;
+ }
+
+ block += dump_part->start_sect;
+
+ /*
+ * If we have a 1K hardware sectorsize, prevent access to single
+ * 512 byte sectors. In theory we could handle this - in fact
+ * the scsi cdrom driver must be able to handle this because
+ * we typically use 1K blocksizes, and cdroms typically have
+ * 2K hardware sectorsizes. Of course, things are simpler
+ * with the cdrom, since it is read-only. For performance
+ * reasons, the filesystems should be able to handle this
+ * and not force the scsi disk driver to use bounce buffers
+ * for this.
+ */
+ if (sdev->sector_size == 1024) {
+ block = block >> 1;
+ this_count = this_count >> 1;
+ }
+ if (sdev->sector_size == 2048) {
+ block = block >> 2;
+ this_count = this_count >> 2;
+ }
+ if (sdev->sector_size == 4096) {
+ block = block >> 3;
+ this_count = this_count >> 3;
+ }
+ switch (rw) {
+ case WRITE:
+ if (!sdev->writeable) {
+ Err("writable media");
+ return 0;
+ }
+ scmd->cmnd[0] = WRITE_10;
+ break;
+ case READ:
+ scmd->cmnd[0] = READ_10;
+ break;
+ default:
+ Err("Unknown command %d", rw);
+ return -EINVAL;
+ }
+
+ if (this_count > 0xffff)
+ this_count = 0xffff;
+
+ scmd->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
+ scmd->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
+ scmd->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
+ scmd->cmnd[5] = (unsigned char) block & 0xff;
+ scmd->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
+ scmd->cmnd[8] = (unsigned char) this_count & 0xff;
+
+ init_scsi_command(sdev, scmd, buf, len,
+ (rw == WRITE ? SCSI_DATA_WRITE : SCSI_DATA_READ), 1);
+ return 0;
+}
+
+/*
+ * Check the status of scsi command and determine whether it is
+ * success, fail, or retriable.
+ *
+ * Return code
+ * > 0: should retry
+ * = 0: success
+ * < 0: fail
+ */
+static int cmd_result(struct scsi_cmnd *scmd)
+{
+ int status;
+
+ status = status_byte(scmd->result);
+
+ switch (scsi_decide_disposition(scmd)) {
+ case FAILED:
+ break;
+ case NEEDS_RETRY:
+ case ADD_TO_MLQUEUE:
+ return 1 /* retry */;
+ case SUCCESS:
+ if (host_byte(scmd->result) != DID_OK)
+ break;
+
+ if (status == GOOD || status == INTERMEDIATE_GOOD
+ || status == INTERMEDIATE_C_GOOD)
+ return 0;
+ if (status == CHECK_CONDITION &&
+ scmd->sense_buffer[2] == RECOVERED_ERROR)
+ return 0;
+ break;
+ default:
+ Err("bad disposition: %d", scmd->result);
+ return -EIO;
+ }
+
+ Err("command %x failed with 0x%x", scmd->cmnd[0], scmd->result);
+ return -EIO;
+}
+
+static int send_command(struct scsi_cmnd *scmd)
+{
+ struct Scsi_Host *host = scmd->device->host;
+ struct scsi_device *sdev = scmd->device;
+ int ret;
+
+ do {
+ if (!scsi_device_online(sdev)) {
+ Err("Scsi disk is not online");
+ return -EIO;
+ }
+ if (sdev->changed) {
+ Err("SCSI disk has been changed. Prohibiting further I/O");
+ return -EIO;
+ }
+
+ spin_lock(host->host_lock);
+ host->hostt->queuecommand(scmd, rw_intr);
+ spin_unlock(host->host_lock);
+
+ while (scmd->done != NULL) {
+ host->hostt->dump_poll(scmd->device);
+ udelay(100);
+ diskdump_update();
+ }
+ scmd->done = rw_intr;
+ } while ((ret = cmd_result(scmd)) > 0);
+
+ return ret;
+}
+
+/*
+ * If Write Cache Enable of disk device is not set, write I/O takes
+ * long long time. So enable WCE temporary and issue SYNCHRONIZE CACHE
+ * after all write I/Os are done, Following system reboot will reset
+ * WCE bit to original value.
+ */
+static void
+enable_write_cache(struct scsi_device *sdev)
+{
+ char buf[256];
+ int ret;
+ int data_len;
+
+ Dbg("enable write cache");
+ memset(buf, 0, 256);
+
+ init_mode_sense_command(sdev, &scsi_dump_cmnd, buf);
+ if ((ret = send_command(&scsi_dump_cmnd)) < 0) {
+ Warn("MODE SENSE failed");
+ return;
+ }
+
+ if (buf[14] & 0x04) /* WCE is already set */
+ return;
+
+ data_len = buf[0] + 1; /* Data length in mode parameter header */
+ buf[0] = 0;
+ buf[1] = 0;
+ buf[2] = 0;
+ buf[12] &= 0x7f; /* clear PS */
+ buf[14] |= 0x04; /* set WCE */
+
+ init_mode_select_command(sdev, &scsi_dump_cmnd, buf, data_len);
+ if ((ret = send_command(&scsi_dump_cmnd)) < 0) {
+ Warn("MODE SELECT failed");
+
+ init_sense_command(sdev, &scsi_dump_cmnd, buf);
+ if ((ret = send_command(&scsi_dump_cmnd)) < 0) {
+ Err("sense failed");
+ }
+ }
+}
+
+/*
+ * Check whether the dump device is sane enough to handle I/O.
+ *
+ * Return value:
+ * 0: the device is ok
+ * < 0: the device is not ok
+ * > 0: Cannot determine
+ */
+static int
+scsi_dump_sanity_check(struct disk_dump_device *dump_device)
+{
+ struct scsi_device *sdev = dump_device->device;
+ struct Scsi_Host *host = sdev->host;
+ int adapter_sanity = 0;
+ int sanity = 0;
+
+ if (!check_crc_module()) {
+ Err("checksum error. scsi dump module may be compromised.");
+ return -EINVAL;
+ }
+ /*
+ * If host's spinlock is already taken, assume it's part
+ * of crash and skip it.
+ */
+ if (!scsi_device_online(sdev)) {
+ Warn("device not online: host %d channel %d id %d lun %d",
+ host->host_no, sdev->channel, sdev->id, sdev->lun);
+ return -EIO;
+ }
+ if (sdev->changed) {
+ Err("SCSI disk has been changed. Prohibiting further I/O: host %d channel %d id %d lun %d",
+ host->host_no, sdev->channel, sdev->id, sdev->lun);
+ return -EIO;
+ }
+
+ if (host->hostt->dump_sanity_check) {
+ adapter_sanity = host->hostt->dump_sanity_check(sdev);
+ if (adapter_sanity < 0) {
+ Warn("adapter status is not sane");
+ return adapter_sanity;
+ }
+ }
+
+ if (!spin_is_locked(host->host_lock)) {
+ sanity = 0;
+ } else {
+ Warn("host_lock is held: host %d channel %d id %d lun %d",
+ host->host_no, sdev->channel, sdev->id, sdev->lun);
+ return -EIO;
+ }
+ return sanity + adapter_sanity;
+}
+
+/*
+ * Try to reset the host adapter. If the adapter does not have its host reset
+ * handler, try to use its bus device reset handler.
+ */
+static int scsi_dump_reset(struct scsi_device *sdev)
+{
+ struct Scsi_Host *host = sdev->host;
+ struct scsi_host_template *hostt = host->hostt;
+ char buf[256];
+ int ret, i;
+
+ init_sense_command(sdev, &scsi_dump_cmnd, buf);
+
+ if (hostt->eh_host_reset_handler) {
+ spin_lock(host->host_lock);
+ ret = hostt->eh_host_reset_handler(&scsi_dump_cmnd);
+ } else if (hostt->eh_bus_reset_handler) {
+ spin_lock(host->host_lock);
+ ret = hostt->eh_bus_reset_handler(&scsi_dump_cmnd);
+ } else
+ return 0;
+ spin_unlock(host->host_lock);
+
+ if (ret != SUCCESS) {
+ Err("adapter reset failed");
+ return -EIO;
+ }
+
+ /* bus reset settle time. 5sec for old disk devices */
+ for (i = 0; i < 5000; i++) {
+ diskdump_update();
+ mdelay(1);
+ }
+
+ Dbg("request sense");
+ if ((ret = send_command(&scsi_dump_cmnd)) < 0) {
+ Err("sense failed");
+ return -EIO;
+ }
+ return 0;
+}
+
+static int
+scsi_dump_quiesce(struct disk_dump_device *dump_device)
+{
+ struct scsi_device *sdev = dump_device->device;
+ struct Scsi_Host *host = sdev->host;
+ int ret;
+
+ if (host->hostt->dump_quiesce) {
+ ret = host->hostt->dump_quiesce(sdev);
+ if (ret < 0)
+ return ret;
+ }
+
+ Dbg("do bus reset");
+ if ((ret = scsi_dump_reset(sdev)) < 0)
+ return ret;
+
+ if (sdev->scsi_level >= SCSI_2)
+ enable_write_cache(sdev);
+
+ quiesce_ok = 1;
+ return 0;
+}
+
+static int scsi_dump_rw_block(struct disk_dump_partition *dump_part, int rw,
+ unsigned long dump_block_nr, void *buf, int len)
+{
+ struct disk_dump_device *dump_device = dump_part->device;
+ struct scsi_device *sdev = dump_device->device;
+ int block_nr = BLOCK_SECTOR(dump_block_nr);
+ int ret;
+
+ if (!quiesce_ok) {
+ Err("quiesce not called");
+ return -EIO;
+ }
+
+ ret = init_rw_command(dump_part, sdev, &scsi_dump_cmnd, rw,
+ block_nr, buf, DUMP_BLOCK_SIZE * len);
+ if (ret < 0) {
+ Err("init_rw_command failed");
+ return ret;
+ }
+ return send_command(&scsi_dump_cmnd);
+}
+
+static int
+scsi_dump_shutdown(struct disk_dump_device *dump_device)
+{
+ struct scsi_device *sdev = dump_device->device;
+ struct Scsi_Host *host = sdev->host;
+
+ if (sdev->scsi_level >= SCSI_2) {
+ init_sync_command(sdev, &scsi_dump_cmnd);
+ send_command(&scsi_dump_cmnd);
+ }
+
+ if (host->hostt->dump_shutdown)
+ return host->hostt->dump_shutdown(sdev);
+
+ return 0;
+}
+
+struct disk_dump_device_ops scsi_dump_device_ops = {
+ .sanity_check = scsi_dump_sanity_check,
+ .rw_block = scsi_dump_rw_block,
+ .quiesce = scsi_dump_quiesce,
+ .shutdown = scsi_dump_shutdown,
+};
+
+static void *scsi_dump_probe(struct device *dev)
+{
+ struct scsi_device *sdev;
+
+ if ((dev->bus == NULL) || (dev->bus->name == NULL) ||
+ strncmp(dev->bus->name, "scsi", 4))
+ return NULL;
+
+ sdev = to_scsi_device(dev);
+ if (!sdev->host->hostt->dump_poll)
+ return NULL;
+
+ return sdev;
+}
+
+static int scsi_dump_add_device(struct disk_dump_device *dump_device)
+{
+ struct scsi_device *sdev;
+ int error;
+
+ sdev = dump_device->device;
+ if (!sdev->host->hostt->dump_poll)
+ return -ENOTSUPP;
+
+ if ((error = scsi_device_get(sdev)) != 0)
+ return error;
+
+ memcpy(&dump_device->ops, &scsi_dump_device_ops,
+ sizeof(scsi_dump_device_ops));
+ if (sdev->host->max_sectors) {
+ dump_device->max_blocks =
+ (sdev->sector_size * sdev->host->max_sectors)
+ >> DUMP_BLOCK_SHIFT;
+ }
+ return 0;
+}
+
+static void scsi_dump_remove_device(struct disk_dump_device *dump_device)
+{
+ struct scsi_device *sdev = dump_device->device;
+
+ scsi_device_put(sdev);
+}
+
+static struct disk_dump_type scsi_dump_type = {
+ .probe = scsi_dump_probe,
+ .add_device = scsi_dump_add_device,
+ .remove_device = scsi_dump_remove_device,
+ .owner = THIS_MODULE,
+};
+
+static int init_scsi_dump(void)
+{
+ int ret;
+
+ if ((ret = register_disk_dump_type(&scsi_dump_type)) < 0) {
+ Err("register failed");
+ return ret;
+ }
+ set_crc_modules();
+ return ret;
+}
+
+static void cleanup_scsi_dump(void)
+{
+ if (unregister_disk_dump_type(&scsi_dump_type) < 0)
+ Err("register failed");
+}
+
+module_init(init_scsi_dump);
+module_exit(cleanup_scsi_dump);
+
+MODULE_LICENSE("GPL");
diff -Nur linux-2.6.8.1.org/drivers/scsi/scsi_error.c linux-2.6.8.1/drivers/scsi/scsi_error.c
--- linux-2.6.8.1.org/drivers/scsi/scsi_error.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/scsi_error.c 2004-08-26 13:56:42.158368321 +0900
@@ -419,6 +419,9 @@
**/
static void scsi_eh_done(struct scsi_cmnd *scmd)
{
+ if (crashdump_mode())
+ return;
+
/*
* if the timeout handler is already running, then just set the
* flag which says we finished late, and return. we have no
diff -Nur linux-2.6.8.1.org/drivers/scsi/scsi_syms.c linux-2.6.8.1/drivers/scsi/scsi_syms.c
--- linux-2.6.8.1.org/drivers/scsi/scsi_syms.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/scsi_syms.c 2004-08-26 13:56:42.158368321 +0900
@@ -16,6 +16,7 @@
#include <scsi/scsicam.h>
#include "scsi_logging.h"
+#include "scsi_priv.h"
/*
@@ -97,3 +98,5 @@
*/
EXPORT_SYMBOL(scsi_add_timer);
EXPORT_SYMBOL(scsi_delete_timer);
+
+EXPORT_SYMBOL(scsi_decide_disposition);
diff -Nur linux-2.6.8.1.org/drivers/scsi/scsi_sysfs.c linux-2.6.8.1/drivers/scsi/scsi_sysfs.c
--- linux-2.6.8.1.org/drivers/scsi/scsi_sysfs.c 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/drivers/scsi/scsi_sysfs.c 2004-08-26 13:56:42.158368321 +0900
@@ -11,6 +11,7 @@
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/device.h>
+#include <linux/diskdump.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
@@ -376,6 +377,7 @@
DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
+DEVICE_ATTR(dump, S_IRUGO | S_IWUSR, diskdump_sysfs_show, diskdump_sysfs_store);
/* Default template for device attributes. May NOT be modified */
static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
@@ -390,6 +392,7 @@
&dev_attr_delete,
&dev_attr_state,
&dev_attr_timeout,
+ &dev_attr_dump,
NULL
};
diff -Nur linux-2.6.8.1.org/include/scsi/scsi_host.h linux-2.6.8.1/include/scsi/scsi_host.h
--- linux-2.6.8.1.org/include/scsi/scsi_host.h 2004-08-25 15:55:50.000000000 +0900
+++ linux-2.6.8.1/include/scsi/scsi_host.h 2004-08-26 13:56:42.159344883 +0900
@@ -370,6 +370,45 @@
* module_init/module_exit.
*/
struct list_head legacy_hosts;
+
+ /* operations for dump */
+
+ /*
+ * dump_sanity_check() checks if the selected device works normally.
+ * A device which returns an error status will not be selected as
+ * the dump device.
+ *
+ * Status: OPTIONAL
+ */
+ int (* dump_sanity_check)(struct scsi_device *);
+
+ /*
+ * dump_quiesce() is called after the device is selected as the
+ * dump device. Usually, host reset is executed and Write Cache
+ * Enable bit of the disk device is temporarily set for the
+ * dump operation.
+ *
+ * Status: OPTIONAL
+ */
+ int (* dump_quiesce)(struct scsi_device *);
+
+ /*
+ * dump_shutdown() is called after dump is completed. Usually
+ * "SYNCHRONIZE CACHE" command is issued to the disk.
+ *
+ * Status: OPTIONAL
+ */
+ int (* dump_shutdown)(struct scsi_device *);
+
+ /*
+ * dump_poll() should call the interrupt handler. It is called
+ * repeatedly after queuecommand() is issued, and until the command
+ * is completed. If the low level device driver support crash dump,
+ * it must have this routine.
+ *
+ * Status: OPTIONAL
+ */
+ void (* dump_poll)(struct scsi_device *);
};
/*
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH 3/4][diskdump] x86-64 support
2004-08-28 9:43 [PATCH 0/4][diskdump] x86-64 support Takao Indoh
2004-08-28 9:44 ` [PATCH 1/4][diskdump] " Takao Indoh
2004-08-28 9:45 ` [PATCH 2/4][diskdump] " Takao Indoh
@ 2004-08-28 9:47 ` Takao Indoh
2004-08-28 9:48 ` [PATCH 4/4][diskdump] " Takao Indoh
3 siblings, 0 replies; 10+ messages in thread
From: Takao Indoh @ 2004-08-28 9:47 UTC (permalink / raw)
To: linux-kernel
This is a patch for aic7xxx/aic79xx driver.
diff -Nur linux-2.6.8.1.org/drivers/scsi/aic7xxx/aic79xx_osm.c linux-2.6.8.1/drivers/scsi/aic7xxx/aic79xx_osm.c
--- linux-2.6.8.1.org/drivers/scsi/aic7xxx/aic79xx_osm.c 2004-08-25 15:55:50.458167279 +0900
+++ linux-2.6.8.1/drivers/scsi/aic7xxx/aic79xx_osm.c 2004-08-25 18:56:51.525417043 +0900
@@ -786,6 +786,8 @@
static int ahd_linux_bus_reset(Scsi_Cmnd *);
static int ahd_linux_dev_reset(Scsi_Cmnd *);
static int ahd_linux_abort(Scsi_Cmnd *);
+static int ahd_linux_sanity_check(struct scsi_device *);
+static void ahd_linux_poll(struct scsi_device *);
/*
* Calculate a safe value for AHD_NSEG (as expressed through ahd_linux_nseg).
@@ -1684,6 +1686,8 @@
.slave_alloc = ahd_linux_slave_alloc,
.slave_configure = ahd_linux_slave_configure,
.slave_destroy = ahd_linux_slave_destroy,
+ .dump_sanity_check = ahd_linux_sanity_check,
+ .dump_poll = ahd_linux_poll,
};
/**************************** Tasklet Handler *********************************/
@@ -4191,6 +4195,39 @@
return IRQ_RETVAL(ours);
}
+static int
+ahd_linux_sanity_check(struct scsi_device *device)
+{
+ struct ahd_softc *ahd;
+ struct ahd_linux_device *dev;
+
+ ahd = *(struct ahd_softc **)device->host->hostdata;
+ dev = ahd_linux_get_device(ahd, device->channel,
+ device->id, device->lun,
+ /*alloc*/FALSE);
+
+ if (dev == NULL)
+ return -ENXIO;
+ if (ahd->platform_data->qfrozen || dev->qfrozen)
+ return -EBUSY;
+ if (spin_is_locked(&ahd->platform_data->spin_lock))
+ return -EBUSY;
+ return 0;
+}
+
+static void
+ahd_linux_poll(struct scsi_device *device)
+{
+ struct ahd_softc *ahd;
+ int ours;
+
+ ahd = *(struct ahd_softc **)device->host->hostdata;
+ ours = ahd_intr(ahd);
+ if (ahd_linux_next_device_to_run(ahd) != NULL)
+ ahd_schedule_runq(ahd);
+ ahd_linux_run_complete_queue(ahd);
+}
+
void
ahd_platform_flushwork(struct ahd_softc *ahd)
{
diff -Nur linux-2.6.8.1.org/drivers/scsi/aic7xxx/aic7xxx_osm.c linux-2.6.8.1/drivers/scsi/aic7xxx/aic7xxx_osm.c
--- linux-2.6.8.1.org/drivers/scsi/aic7xxx/aic7xxx_osm.c 2004-08-25 15:55:50.463050091 +0900
+++ linux-2.6.8.1/drivers/scsi/aic7xxx/aic7xxx_osm.c 2004-08-25 18:56:51.528346731 +0900
@@ -774,6 +774,8 @@
static int ahc_linux_bus_reset(Scsi_Cmnd *);
static int ahc_linux_dev_reset(Scsi_Cmnd *);
static int ahc_linux_abort(Scsi_Cmnd *);
+static int ahc_linux_sanity_check(struct scsi_device *);
+static void ahc_linux_poll(struct scsi_device *);
/*
* Calculate a safe value for AHC_NSEG (as expressed through ahc_linux_nseg).
@@ -1310,6 +1312,8 @@
.slave_alloc = ahc_linux_slave_alloc,
.slave_configure = ahc_linux_slave_configure,
.slave_destroy = ahc_linux_slave_destroy,
+ .dump_sanity_check = ahc_linux_sanity_check,
+ .dump_poll = ahc_linux_poll,
};
/**************************** Tasklet Handler *********************************/
@@ -3863,6 +3867,41 @@
return IRQ_RETVAL(ours);
}
+static int
+ahc_linux_sanity_check(struct scsi_device *device)
+{
+ struct ahc_softc *ahc;
+ struct ahc_linux_device *dev;
+
+ ahc = *(struct ahc_softc **)device->host->hostdata;
+ dev = ahc_linux_get_device(ahc, device->channel,
+ device->id, device->lun,
+ /*alloc*/FALSE);
+ if (dev == NULL)
+ return -ENXIO;
+ if (ahc->platform_data->qfrozen || dev->qfrozen)
+ return -EBUSY;
+ if (spin_is_locked(&ahc->platform_data->spin_lock))
+ return -EBUSY;
+ return 0;
+}
+
+static void
+ahc_linux_poll(struct scsi_device *device)
+{
+ struct ahc_softc *ahc;
+ struct ahc_linux_device *dev;
+
+ ahc = *(struct ahc_softc **)device->host->hostdata;
+ ahc_intr(ahc);
+ while ((dev = ahc_linux_next_device_to_run(ahc)) != NULL) {
+ TAILQ_REMOVE(&ahc->platform_data->device_runq, dev, links);
+ dev->flags &= ~AHC_DEV_ON_RUN_LIST;
+ ahc_linux_check_device_queue(ahc, dev);
+ }
+ ahc_linux_run_complete_queue(ahc);
+}
+
void
ahc_platform_flushwork(struct ahc_softc *ahc)
{
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH 4/4][diskdump] x86-64 support
2004-08-28 9:43 [PATCH 0/4][diskdump] x86-64 support Takao Indoh
` (2 preceding siblings ...)
2004-08-28 9:47 ` [PATCH 3/4][diskdump] " Takao Indoh
@ 2004-08-28 9:48 ` Takao Indoh
2004-08-28 10:23 ` Christoph Hellwig
3 siblings, 1 reply; 10+ messages in thread
From: Takao Indoh @ 2004-08-28 9:48 UTC (permalink / raw)
To: linux-kernel
This is a patch for Fusion-MPT scsi driver.
diff -Nur linux-2.6.8.1.org/drivers/message/fusion/mptbase.c linux-2.6.8.1/drivers/message/fusion/mptbase.c
--- linux-2.6.8.1.org/drivers/message/fusion/mptbase.c 2004-08-25 15:55:50.548987590 +0900
+++ linux-2.6.8.1/drivers/message/fusion/mptbase.c 2004-08-25 19:02:34.647483153 +0900
@@ -5950,6 +5950,22 @@
}
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/**
+ * mpt_poll_interrupt - Check the status of interrupt and if any interrupt
+ * are triggered, call interrupt handler.
+ * @ioc: Pointer to MPT_ADAPTER structure
+ */
+void
+mpt_poll_interrupt(MPT_ADAPTER *ioc)
+{
+ u32 intstat;
+
+ intstat = CHIPREG_READ32(&ioc->chip->IntStatus);
+
+ if (intstat & MPI_HIS_REPLY_MESSAGE_INTERRUPT)
+ mpt_interrupt(0, ioc, NULL);
+}
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
EXPORT_SYMBOL(ioc_list);
EXPORT_SYMBOL(mpt_proc_root_dir);
@@ -5988,6 +6004,7 @@
EXPORT_SYMBOL(mpt_ASCQ_TableSz);
EXPORT_SYMBOL(mpt_ScsiOpcodesPtr);
+EXPORT_SYMBOL(mpt_poll_interrupt);
static struct pci_driver mptbase_driver = {
.name = "mptbase",
diff -Nur linux-2.6.8.1.org/drivers/message/fusion/mptbase.h linux-2.6.8.1/drivers/message/fusion/mptbase.h
--- linux-2.6.8.1.org/drivers/message/fusion/mptbase.h 2004-08-25 15:55:50.546057903 +0900
+++ linux-2.6.8.1/drivers/message/fusion/mptbase.h 2004-08-25 19:03:35.213888661 +0900
@@ -1075,6 +1075,7 @@
extern void mpt_free_fw_memory(MPT_ADAPTER *ioc);
extern int mpt_findImVolumes(MPT_ADAPTER *ioc);
extern int mpt_read_ioc_pg_3(MPT_ADAPTER *ioc);
+extern void mpt_poll_interrupt(MPT_ADAPTER *ioc);
/*
* Public data decl's...
@@ -1090,6 +1091,23 @@
extern const char **mpt_ScsiOpcodesPtr;
extern int mpt_ASCQ_TableSz;
+/*
+ * Dump stuff...
+ */
+#include <linux/diskdump.h>
+
+#define MPT_HOST_LOCK(host_lock) \
+ if (crashdump_mode()) \
+ spin_lock(host_lock); \
+ else \
+ spin_lock_irq(host_lock);
+
+#define MPT_HOST_UNLOCK(host_lock) \
+ if (crashdump_mode()) \
+ spin_unlock(host_lock); \
+ else \
+ spin_unlock_irq(host_lock);
+
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
#endif /* } __KERNEL__ */
diff -Nur linux-2.6.8.1.org/drivers/message/fusion/mptscsih.c linux-2.6.8.1/drivers/message/fusion/mptscsih.c
--- linux-2.6.8.1.org/drivers/message/fusion/mptscsih.c 2004-08-25 15:55:50.548987590 +0900
+++ linux-2.6.8.1/drivers/message/fusion/mptscsih.c 2004-08-25 19:02:34.652365965 +0900
@@ -2892,7 +2892,7 @@
/* If our attempts to reset the host failed, then return a failed
* status. The host will be taken off line by the SCSI mid-layer.
*/
- spin_unlock_irq(host_lock);
+ MPT_HOST_UNLOCK(host_lock);
if (mpt_HardResetHandler(hd->ioc, CAN_SLEEP) < 0){
status = FAILED;
} else {
@@ -2902,7 +2902,7 @@
hd->tmPending = 0;
hd->tmState = TM_STATE_NONE;
}
- spin_lock_irq(host_lock);
+ MPT_HOST_LOCK(host_lock);
dtmprintk( ( KERN_WARNING MYNAM ": mptscsih_host_reset: "
@@ -3284,6 +3284,49 @@
return 0;
}
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/*
+ * OS entry point to check whether the host drivier is sane enough
+ * to be used for saving crash dump. Called once when system crash
+ * occurs.
+ */
+int
+mptscsih_sanity_check(struct scsi_device *sdev)
+{
+ MPT_ADAPTER *ioc;
+ MPT_SCSI_HOST *hd;
+
+ hd = (MPT_SCSI_HOST *) sdev->host->hostdata;
+ if (!hd)
+ return -ENXIO;
+ ioc = hd->ioc;
+
+ /* message frame freeQ is busy */
+ if (spin_is_locked(&ioc->FreeQlock))
+ return -EBUSY;
+
+ return 0;
+}
+
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/*
+ * OS entry point to poll whether the adapter issue the interrupts.
+ * Called repeatedly after I/O commands are issued to this adapter.
+ */
+void
+mptscsih_poll(struct scsi_device *sdev)
+{
+ MPT_SCSI_HOST *hd;
+
+ hd = (MPT_SCSI_HOST *) sdev->host->hostdata;
+ if (!hd)
+ return;
+
+ /* check interrupt pending */
+ mpt_poll_interrupt(hd->ioc);
+}
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
@@ -3764,6 +3807,8 @@
.max_sectors = 8192,
.cmd_per_lun = 7,
.use_clustering = ENABLE_CLUSTERING,
+ .dump_sanity_check = mptscsih_sanity_check,
+ .dump_poll = mptscsih_poll,
};
@@ -5580,6 +5625,9 @@
}
spin_unlock_irqrestore(&dvtaskQ_lock, flags);
+ if (crashdump_mode())
+ return;
+
/* For this ioc, loop through all devices and do dv to each device.
* When complete with this ioc, search through the ioc list, and
* for each scsi ioc found, do dv for all devices. Exit when no
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 2/4][diskdump] x86-64 support
2004-08-28 9:45 ` [PATCH 2/4][diskdump] " Takao Indoh
@ 2004-08-28 10:21 ` Christoph Hellwig
0 siblings, 0 replies; 10+ messages in thread
From: Christoph Hellwig @ 2004-08-28 10:21 UTC (permalink / raw)
To: Takao Indoh; +Cc: linux-kernel
On Sat, Aug 28, 2004 at 06:45:56PM +0900, Takao Indoh wrote:
> This is a patch for scsi common layer.
still broken. files that are not part of scsi_mod _must_ not include
scsi_priv.h. You're still redefining SCSI_DATA_* instead of using the proper
constants directly. scsi_dump_probe still makes too many assumptions, the
selection must be entirely inside the scsi layer.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 4/4][diskdump] x86-64 support
2004-08-28 9:48 ` [PATCH 4/4][diskdump] " Takao Indoh
@ 2004-08-28 10:23 ` Christoph Hellwig
2004-08-31 9:10 ` Takao Indoh
0 siblings, 1 reply; 10+ messages in thread
From: Christoph Hellwig @ 2004-08-28 10:23 UTC (permalink / raw)
To: Takao Indoh; +Cc: linux-kernel
On Sat, Aug 28, 2004 at 06:48:11PM +0900, Takao Indoh wrote:
> +/*
> + * Dump stuff...
> + */
> +#include <linux/diskdump.h>
> +
> +#define MPT_HOST_LOCK(host_lock) \
> + if (crashdump_mode()) \
> + spin_lock(host_lock); \
> + else \
> + spin_lock_irq(host_lock);
> +
> +#define MPT_HOST_UNLOCK(host_lock) \
> + if (crashdump_mode()) \
> + spin_unlock(host_lock); \
> + else \
> + spin_unlock_irq(host_lock);
> +
Please stop this macro madness. Why can't you simply use
spin+lock_irqsave?
> +mptscsih_sanity_check(struct scsi_device *sdev)
> +{
> + MPT_ADAPTER *ioc;
> + MPT_SCSI_HOST *hd;
> +
> + hd = (MPT_SCSI_HOST *) sdev->host->hostdata;
> + if (!hd)
> + return -ENXIO;
> + ioc = hd->ioc;
> +
> + /* message frame freeQ is busy */
> + if (spin_is_locked(&ioc->FreeQlock))
> + return -EBUSY;
As in the scsi code spin_is_locked checks are bogus and racy. Only
a spin_trylock would be safe. hd can't be NULL.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 4/4][diskdump] x86-64 support
2004-08-28 10:23 ` Christoph Hellwig
@ 2004-08-31 9:10 ` Takao Indoh
2004-09-04 11:11 ` Christoph Hellwig
2004-09-04 22:31 ` Lee Revell
0 siblings, 2 replies; 10+ messages in thread
From: Takao Indoh @ 2004-08-31 9:10 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: linux-kernel
Thanks for comment.
On Sat, 28 Aug 2004 11:23:24 +0100, Christoph Hellwig wrote:
>> +mptscsih_sanity_check(struct scsi_device *sdev)
>> +{
>> + MPT_ADAPTER *ioc;
>> + MPT_SCSI_HOST *hd;
>> +
>> + hd = (MPT_SCSI_HOST *) sdev->host->hostdata;
>> + if (!hd)
>> + return -ENXIO;
>> + ioc = hd->ioc;
>> +
>> + /* message frame freeQ is busy */
>> + if (spin_is_locked(&ioc->FreeQlock))
>> + return -EBUSY;
>
>As in the scsi code spin_is_locked checks are bogus and racy. Only
>a spin_trylock would be safe. hd can't be NULL.
Could you explain to me why spin_is_locked is not safe?
Regards,
Takao Indoh
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 4/4][diskdump] x86-64 support
2004-08-31 9:10 ` Takao Indoh
@ 2004-09-04 11:11 ` Christoph Hellwig
2004-09-04 22:31 ` Lee Revell
1 sibling, 0 replies; 10+ messages in thread
From: Christoph Hellwig @ 2004-09-04 11:11 UTC (permalink / raw)
To: Takao Indoh; +Cc: linux-kernel
On Tue, Aug 31, 2004 at 06:10:40PM +0900, Takao Indoh wrote:
> >a spin_trylock would be safe. hd can't be NULL.
>
> Could you explain to me why spin_is_locked is not safe?
it's inherently racy. Also it's always return 0 on UP systems which
makes it totally useless there.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 4/4][diskdump] x86-64 support
2004-08-31 9:10 ` Takao Indoh
2004-09-04 11:11 ` Christoph Hellwig
@ 2004-09-04 22:31 ` Lee Revell
1 sibling, 0 replies; 10+ messages in thread
From: Lee Revell @ 2004-09-04 22:31 UTC (permalink / raw)
To: Takao Indoh; +Cc: Christoph Hellwig, linux-kernel
On Tue, 2004-08-31 at 05:10, Takao Indoh wrote:
> >As in the scsi code spin_is_locked checks are bogus and racy. Only
> >a spin_trylock would be safe. hd can't be NULL.
>
> Could you explain to me why spin_is_locked is not safe?
>
Say you have a door with a lock, and someone on the other side. You
look at the lock, see that it's unlocked, then open the door. You
cannot guarantee that the door will open because the person on the other
side could have locked it between the time you looked and turned the
handle.
The only way to know for sure whether the door is locked is to turn the
handle and see if it opens.
Lee
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2004-09-04 22:31 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-08-28 9:43 [PATCH 0/4][diskdump] x86-64 support Takao Indoh
2004-08-28 9:44 ` [PATCH 1/4][diskdump] " Takao Indoh
2004-08-28 9:45 ` [PATCH 2/4][diskdump] " Takao Indoh
2004-08-28 10:21 ` Christoph Hellwig
2004-08-28 9:47 ` [PATCH 3/4][diskdump] " Takao Indoh
2004-08-28 9:48 ` [PATCH 4/4][diskdump] " Takao Indoh
2004-08-28 10:23 ` Christoph Hellwig
2004-08-31 9:10 ` Takao Indoh
2004-09-04 11:11 ` Christoph Hellwig
2004-09-04 22:31 ` Lee Revell
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