[RFC] [PATCH 1/2] s390: SCSI dump kernel and userspace application
Kernel part of the s390 SCSI dumper: zcore character device driver.
Acked-by: Martin Schwidefsky <[EMAIL PROTECTED]>
Signed-off-by: Michael Holzheu <[EMAIL PROTECTED]>
---
Documentation/s390/zfcpdump.txt | 41 +
arch/s390/Kconfig |7
arch/s390/kernel/early.c|3
arch/s390/kernel/head64.S | 43 +
arch/s390/kernel/ipl.c | 24 -
arch/s390/kernel/setup.c|3
arch/s390/kernel/smp.c |1
drivers/s390/char/Makefile |2
drivers/s390/char/sclp.h|2
drivers/s390/char/sclp_sdias.c | 248 +++
drivers/s390/char/zcore.c | 885
drivers/s390/cio/cio.c |1
include/asm-s390/ipl.h | 116 +
include/asm-s390/processor.h|5
include/asm-s390/sclp.h |2
include/asm-s390/setup.h| 75 ---
16 files changed, 1360 insertions(+), 98 deletions(-)
Index: git-linux-2.6/Documentation/s390/zfcpdump.txt
===
--- /dev/null 1970-01-01 00:00:00.0 +
+++ git-linux-2.6/Documentation/s390/zfcpdump.txt 2007-02-21
11:00:15.0 +0100
@@ -0,0 +1,41 @@
+s390 SCSI dump tool (zfcpdump)
+
+System z machines (z900 or higher) provide hardware support for creating system
+dumps on SCSI disks. The dump process is initiated by booting a dump tool,
which
+has to create a dump of the current (probably crashed) Linux image. In order to
+not overwrite memory of the crashed Linux with data of the dump tool, the
+hardware saves some memory plus the register sets of the boot cpu before the
+dump tool is loaded. There exists an SCLP hardware interface to obtain the
saved
+memory afterwards. Currently 32 MB are saved.
+
+This zfcpdump implementation consists of a small Linux dump kernel together
with
+a userspace dump tool, which are loaded together into the saved memory region
+below 32 MB. zfcpdump is installed on a SCSI disk using zipl (as contained in
the
+s390-tools package) to make the device bootable. The operator of a Linux system
+can then trigger a scsi dump by booting the SCSI disk, where zfcpdump resides
on.
+
+The kernel part of zfcpdump is implemented as a character device driver named
+"zcore", which exports memory and registers of the crashed Linux in an s390
+standalone dump format. It can be used in the same way as e.g. /dev/mem. The
+dump format defines a 4K header followed by plain uncompressed memory. The
+register sets are stored in the prefix pages of the different cpus. To build an
+dump enabled kernel with the zcore driver, the kernel config option
+"S390_ZFCPDUMP" has to be set. When reading from /dev/zcore, the first part of
+memory, which has been saved by the hardware is read by the driver via the SCLP
+hardware interface. The second part is just copied from the non overwritten
real
+memory.
+
+The userspace application of zfcpdump resides in an intitramfs. It reads from
+/dev/zcore and writes the system dump to a file on a SCSI disk.
+
+To build zfcpdump you have to do the following:
+- Use /arch/s390/zfcpdump/defconfig.zfcpdump as kernel configuration file,
which
+ enables the S390_ZFCPDUMP option and sets all other required kernel options.
+- Issue "make zfcpdump" from the toplevel directory of the linux tree to
+ build the userspace application. Note, that the zfcpdump application has a
+ dependency on glibc and libz.
+- Issue "make image" to build the zfcpdump image with initramfs.
+
+The zfcpdump enabled kernel image must be copied to
+/usr/share/zfcpdump/zfcpdump.image, where the zipl tool is looking for the dump
+kernel, when preparing a SCSI dump disk.
Index: git-linux-2.6/arch/s390/Kconfig
===
--- git-linux-2.6.orig/arch/s390/Kconfig2007-02-21 10:22:03.0
+0100
+++ git-linux-2.6/arch/s390/Kconfig 2007-02-21 11:00:15.0 +0100
@@ -512,6 +512,13 @@ config KEXEC
current kernel, and to start another kernel. It is like a reboot
but is independent of hardware/microcode support.
+config S390_ZFCPDUMP
+ bool "zfcp dump kernel"
+ default n
+ help
+ Select this option if you want to build an zfcp dump enabled kernel.
+ Do NOT select this option for normal kernels!
+
endmenu
source "net/Kconfig"
Index: git-linux-2.6/arch/s390/kernel/early.c
===
--- git-linux-2.6.orig/arch/s390/kernel/early.c 2007-02-21 10:22:04.0
+0100
+++ git-linux-2.6/arch/s390/kernel/early.c 2007-02-21 10:56:03.0
+0100
@@ -14,6 +14,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -129,7 +130,7 @@ static noinline __init void detect_machi
{
struct cpuinfo_S390 *cpuinfo = _lowcore.cpu_data;
- asm volatile("stidp %0" : "=m" (S390_lowcore.cpu_data.cpu_id));
+
[RFC] [PATCH 1/2] s390: SCSI dump kernel and userspace application
Kernel part of the s390 SCSI dumper: zcore character device driver.
Acked-by: Martin Schwidefsky [EMAIL PROTECTED]
Signed-off-by: Michael Holzheu [EMAIL PROTECTED]
---
Documentation/s390/zfcpdump.txt | 41 +
arch/s390/Kconfig |7
arch/s390/kernel/early.c|3
arch/s390/kernel/head64.S | 43 +
arch/s390/kernel/ipl.c | 24 -
arch/s390/kernel/setup.c|3
arch/s390/kernel/smp.c |1
drivers/s390/char/Makefile |2
drivers/s390/char/sclp.h|2
drivers/s390/char/sclp_sdias.c | 248 +++
drivers/s390/char/zcore.c | 885
drivers/s390/cio/cio.c |1
include/asm-s390/ipl.h | 116 +
include/asm-s390/processor.h|5
include/asm-s390/sclp.h |2
include/asm-s390/setup.h| 75 ---
16 files changed, 1360 insertions(+), 98 deletions(-)
Index: git-linux-2.6/Documentation/s390/zfcpdump.txt
===
--- /dev/null 1970-01-01 00:00:00.0 +
+++ git-linux-2.6/Documentation/s390/zfcpdump.txt 2007-02-21
11:00:15.0 +0100
@@ -0,0 +1,41 @@
+s390 SCSI dump tool (zfcpdump)
+
+System z machines (z900 or higher) provide hardware support for creating system
+dumps on SCSI disks. The dump process is initiated by booting a dump tool,
which
+has to create a dump of the current (probably crashed) Linux image. In order to
+not overwrite memory of the crashed Linux with data of the dump tool, the
+hardware saves some memory plus the register sets of the boot cpu before the
+dump tool is loaded. There exists an SCLP hardware interface to obtain the
saved
+memory afterwards. Currently 32 MB are saved.
+
+This zfcpdump implementation consists of a small Linux dump kernel together
with
+a userspace dump tool, which are loaded together into the saved memory region
+below 32 MB. zfcpdump is installed on a SCSI disk using zipl (as contained in
the
+s390-tools package) to make the device bootable. The operator of a Linux system
+can then trigger a scsi dump by booting the SCSI disk, where zfcpdump resides
on.
+
+The kernel part of zfcpdump is implemented as a character device driver named
+zcore, which exports memory and registers of the crashed Linux in an s390
+standalone dump format. It can be used in the same way as e.g. /dev/mem. The
+dump format defines a 4K header followed by plain uncompressed memory. The
+register sets are stored in the prefix pages of the different cpus. To build an
+dump enabled kernel with the zcore driver, the kernel config option
+S390_ZFCPDUMP has to be set. When reading from /dev/zcore, the first part of
+memory, which has been saved by the hardware is read by the driver via the SCLP
+hardware interface. The second part is just copied from the non overwritten
real
+memory.
+
+The userspace application of zfcpdump resides in an intitramfs. It reads from
+/dev/zcore and writes the system dump to a file on a SCSI disk.
+
+To build zfcpdump you have to do the following:
+- Use /arch/s390/zfcpdump/defconfig.zfcpdump as kernel configuration file,
which
+ enables the S390_ZFCPDUMP option and sets all other required kernel options.
+- Issue make zfcpdump from the toplevel directory of the linux tree to
+ build the userspace application. Note, that the zfcpdump application has a
+ dependency on glibc and libz.
+- Issue make image to build the zfcpdump image with initramfs.
+
+The zfcpdump enabled kernel image must be copied to
+/usr/share/zfcpdump/zfcpdump.image, where the zipl tool is looking for the dump
+kernel, when preparing a SCSI dump disk.
Index: git-linux-2.6/arch/s390/Kconfig
===
--- git-linux-2.6.orig/arch/s390/Kconfig2007-02-21 10:22:03.0
+0100
+++ git-linux-2.6/arch/s390/Kconfig 2007-02-21 11:00:15.0 +0100
@@ -512,6 +512,13 @@ config KEXEC
current kernel, and to start another kernel. It is like a reboot
but is independent of hardware/microcode support.
+config S390_ZFCPDUMP
+ bool zfcp dump kernel
+ default n
+ help
+ Select this option if you want to build an zfcp dump enabled kernel.
+ Do NOT select this option for normal kernels!
+
endmenu
source net/Kconfig
Index: git-linux-2.6/arch/s390/kernel/early.c
===
--- git-linux-2.6.orig/arch/s390/kernel/early.c 2007-02-21 10:22:04.0
+0100
+++ git-linux-2.6/arch/s390/kernel/early.c 2007-02-21 10:56:03.0
+0100
@@ -14,6 +14,7 @@
#include linux/module.h
#include linux/pfn.h
#include linux/uaccess.h
+#include asm/ipl.h
#include asm/lowcore.h
#include asm/processor.h
#include asm/sections.h
@@ -129,7 +130,7 @@ static noinline __init void detect_machi
{
struct cpuinfo_S390 *cpuinfo = S390_lowcore.cpu_data;
- asm
