Malta probs

Malta probs

[Ralf Baechle]

On Tue, Oct 23, 2001 at 01:25:26PM -0700, Petko Manolov wrote:

> The theory looks good, but in reality latest kernel crashes
> with machine check exception in local_flush_tlb_all on malta
> board.  I tried both egcs-1.1.2 and gcc-3.0.1 and both are
> crashing at the same place.

What CPU are you using; can you send me your .config file?

  Ralf

Re: Malta probs

[Petko Manolov]

[-- Attachment #1: Type: text/plain, Size: 392 bytes --]

Ralf Baechle wrote:
> 
> What CPU are you using; can you send me your .config file?

I am using R4Kc core on Malta board; here is the .config file.

BTW the kernel silently hang after executing execve("/sbin/init")
in init/main.c file. I suspect some of the tlb handling code
which was recently changed is causing the crash. Not having any
register dump also increase the entropy :-)


	Petko

[-- Attachment #2: config --]
[-- Type: text/plain, Size: 9632 bytes --]

#
# Automatically generated make config: don't edit
#
CONFIG_MIPS=y
# CONFIG_SMP is not set

#
# Code maturity level options
#
CONFIG_EXPERIMENTAL=y

#
# Machine selection
#
# CONFIG_ACER_PICA_61 is not set
# CONFIG_ALGOR_P4032 is not set
# CONFIG_BAGET_MIPS is not set
# CONFIG_DECSTATION is not set
# CONFIG_DDB5074 is not set
# CONFIG_MIPS_EV96100 is not set
# CONFIG_MIPS_EV64120 is not set
# CONFIG_MIPS_ATLAS is not set
CONFIG_MIPS_MALTA=y
# CONFIG_NINO is not set
# CONFIG_MIPS_MAGNUM_4000 is not set
# CONFIG_MOMENCO_OCELOT is not set
# CONFIG_DDB5476 is not set
# CONFIG_DDB5477 is not set
# CONFIG_NEC_OSPREY is not set
# CONFIG_OLIVETTI_M700 is not set
# CONFIG_SGI_IP22 is not set
# CONFIG_SNI_RM200_PCI is not set
# CONFIG_MIPS_ITE8172 is not set
# CONFIG_MIPS_IVR is not set
# CONFIG_MIPS_PB1000 is not set
CONFIG_RWSEM_GENERIC_SPINLOCK=y
# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set
# CONFIG_MCA is not set
# CONFIG_SBUS is not set
CONFIG_I8259=y
CONFIG_PCI=y
CONFIG_HAVE_STD_PC_SERIAL_PORT=y
CONFIG_NEW_IRQ=y
CONFIG_SWAP_IO_SPACE=y
# CONFIG_ISA is not set
# CONFIG_EISA is not set

#
# Loadable module support
#
CONFIG_MODULES=y
# CONFIG_MODVERSIONS is not set
# CONFIG_KMOD is not set

#
# CPU selection
#
# CONFIG_CPU_R3000 is not set
# CONFIG_CPU_R6000 is not set
# CONFIG_CPU_VR41XX is not set
# CONFIG_CPU_R4300 is not set
# CONFIG_CPU_R4X00 is not set
# CONFIG_CPU_R5000 is not set
# CONFIG_CPU_R5432 is not set
# CONFIG_CPU_RM7000 is not set
# CONFIG_CPU_NEVADA is not set
# CONFIG_CPU_R10000 is not set
# CONFIG_CPU_SB1 is not set
CONFIG_CPU_MIPS32=y
# CONFIG_CPU_MIPS64 is not set
# CONFIG_CPU_ADVANCED is not set
CONFIG_CPU_HAS_LLSC=y
# CONFIG_CPU_HAS_LLDSCD is not set
# CONFIG_CPU_HAS_WB is not set

#
# General setup
#
CONFIG_CPU_LITTLE_ENDIAN=y
CONFIG_KCORE_ELF=y
CONFIG_ELF_KERNEL=y
# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_MISC is not set
CONFIG_NET=y
# CONFIG_PCI_NAMES is not set
# CONFIG_HOTPLUG is not set
# CONFIG_PCMCIA is not set
CONFIG_SYSVIPC=y
# CONFIG_BSD_PROCESS_ACCT is not set
CONFIG_SYSCTL=y

#
# Memory Technology Devices (MTD)
#
# CONFIG_MTD is not set

#
# Parallel port support
#
# CONFIG_PARPORT is not set

#
# Block devices
#
# CONFIG_BLK_DEV_FD is not set
# CONFIG_BLK_DEV_XD is not set
# CONFIG_PARIDE is not set
# CONFIG_BLK_CPQ_DA is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_DAC960 is not set
# CONFIG_BLK_DEV_LOOP is not set
# CONFIG_BLK_DEV_NBD is not set
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=16384
CONFIG_BLK_DEV_INITRD=y

#
# Multi-device support (RAID and LVM)
#
# CONFIG_MD is not set
# CONFIG_BLK_DEV_MD is not set
# CONFIG_MD_LINEAR is not set
# CONFIG_MD_RAID0 is not set
# CONFIG_MD_RAID1 is not set
# CONFIG_MD_RAID5 is not set
# CONFIG_MD_MULTIPATH is not set
# CONFIG_BLK_DEV_LVM is not set

#
# Networking options
#
# CONFIG_PACKET is not set
# CONFIG_NETLINK is not set
# CONFIG_NETFILTER is not set
# CONFIG_FILTER is not set
CONFIG_UNIX=y
CONFIG_INET=y
# CONFIG_IP_MULTICAST is not set
# CONFIG_IP_ADVANCED_ROUTER is not set
# CONFIG_IP_PNP is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE is not set
# CONFIG_INET_ECN is not set
# CONFIG_SYN_COOKIES is not set
# CONFIG_IPV6 is not set
# CONFIG_KHTTPD is not set
# CONFIG_ATM is not set

#
#  
#
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_DECNET is not set
# CONFIG_BRIDGE is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_LLC is not set
# CONFIG_NET_DIVERT is not set
# CONFIG_ECONET is not set
# CONFIG_WAN_ROUTER is not set
# CONFIG_NET_FASTROUTE is not set
# CONFIG_NET_HW_FLOWCONTROL is not set

#
# QoS and/or fair queueing
#
# CONFIG_NET_SCHED is not set

#
# Telephony Support
#
# CONFIG_PHONE is not set
# CONFIG_PHONE_IXJ is not set
# CONFIG_PHONE_IXJ_PCMCIA is not set

#
# ATA/IDE/MFM/RLL support
#
# CONFIG_IDE is not set
# CONFIG_BLK_DEV_IDE_MODES is not set
# CONFIG_BLK_DEV_HD is not set

#
# SCSI support
#
# CONFIG_SCSI is not set

#
# I2O device support
#
# CONFIG_I2O is not set
# CONFIG_I2O_PCI is not set
# CONFIG_I2O_BLOCK is not set
# CONFIG_I2O_LAN is not set
# CONFIG_I2O_SCSI is not set
# CONFIG_I2O_PROC is not set

#
# Network device support
#
CONFIG_NETDEVICES=y

#
# ARCnet devices
#
# CONFIG_ARCNET is not set
# CONFIG_DUMMY is not set
# CONFIG_BONDING is not set
# CONFIG_EQUALIZER is not set
# CONFIG_TUN is not set

#
# Ethernet (10 or 100Mbit)
#
CONFIG_NET_ETHERNET=y
# CONFIG_SUNLANCE is not set
# CONFIG_HAPPYMEAL is not set
# CONFIG_SUNBMAC is not set
# CONFIG_SUNQE is not set
# CONFIG_SUNLANCE is not set
# CONFIG_SUNGEM is not set
# CONFIG_NET_VENDOR_3COM is not set
# CONFIG_LANCE is not set
# CONFIG_NET_VENDOR_SMC is not set
# CONFIG_NET_VENDOR_RACAL is not set
# CONFIG_HP100 is not set
# CONFIG_NET_ISA is not set
CONFIG_NET_PCI=y
CONFIG_PCNET32=y
# CONFIG_ADAPTEC_STARFIRE is not set
# CONFIG_APRICOT is not set
# CONFIG_CS89x0 is not set
# CONFIG_TULIP is not set
# CONFIG_DE4X5 is not set
# CONFIG_DGRS is not set
# CONFIG_DM9102 is not set
# CONFIG_EEPRO100 is not set
# CONFIG_LNE390 is not set
# CONFIG_FEALNX is not set
# CONFIG_NATSEMI is not set
# CONFIG_NE2K_PCI is not set
# CONFIG_NE3210 is not set
# CONFIG_ES3210 is not set
# CONFIG_8139TOO is not set
# CONFIG_8139TOO_PIO is not set
# CONFIG_8139TOO_TUNE_TWISTER is not set
# CONFIG_8139TOO_8129 is not set
# CONFIG_SIS900 is not set
# CONFIG_EPIC100 is not set
# CONFIG_SUNDANCE is not set
# CONFIG_TLAN is not set
# CONFIG_VIA_RHINE is not set
# CONFIG_WINBOND_840 is not set
# CONFIG_LAN_SAA9730 is not set
# CONFIG_NET_POCKET is not set

#
# Ethernet (1000 Mbit)
#
# CONFIG_ACENIC is not set
# CONFIG_DL2K is not set
# CONFIG_MYRI_SBUS is not set
# CONFIG_NS83820 is not set
# CONFIG_HAMACHI is not set
# CONFIG_YELLOWFIN is not set
# CONFIG_SK98LIN is not set
# CONFIG_FDDI is not set
# CONFIG_HIPPI is not set
# CONFIG_PLIP is not set
# CONFIG_PPP is not set
# CONFIG_SLIP is not set

#
# Wireless LAN (non-hamradio)
#
# CONFIG_NET_RADIO is not set

#
# Token Ring devices
#
# CONFIG_TR is not set
# CONFIG_NET_FC is not set
# CONFIG_RCPCI is not set
# CONFIG_SHAPER is not set

#
# Wan interfaces
#
# CONFIG_WAN is not set

#
# Amateur Radio support
#
# CONFIG_HAMRADIO is not set

#
# IrDA (infrared) support
#
# CONFIG_IRDA is not set

#
# ISDN subsystem
#
# CONFIG_ISDN is not set

#
# Old CD-ROM drivers (not SCSI, not IDE)
#
# CONFIG_CD_NO_IDESCSI is not set

#
# Character devices
#
# CONFIG_VT is not set
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
# CONFIG_SERIAL_EXTENDED is not set
# CONFIG_SERIAL_NONSTANDARD is not set
# CONFIG_UNIX98_PTYS is not set

#
# I2C support
#
# CONFIG_I2C is not set

#
# Mice
#
# CONFIG_BUSMOUSE is not set
# CONFIG_MOUSE is not set

#
# Joysticks
#
# CONFIG_INPUT_GAMEPORT is not set

#
# Input core support is needed for gameports
#

#
# Input core support is needed for joysticks
#
# CONFIG_QIC02_TAPE is not set

#
# Watchdog Cards
#
# CONFIG_WATCHDOG is not set
# CONFIG_INTEL_RNG is not set
# CONFIG_NVRAM is not set
CONFIG_RTC=y
# CONFIG_DTLK is not set
# CONFIG_R3964 is not set
# CONFIG_APPLICOM is not set
# CONFIG_SONYPI is not set

#
# Ftape, the floppy tape device driver
#
# CONFIG_FTAPE is not set
# CONFIG_AGP is not set
# CONFIG_DRM is not set

#
# Multimedia devices
#
# CONFIG_VIDEO_DEV is not set

#
# File systems
#
# CONFIG_QUOTA is not set
# CONFIG_AUTOFS_FS is not set
# CONFIG_AUTOFS4_FS is not set
# CONFIG_REISERFS_FS is not set
# CONFIG_REISERFS_CHECK is not set
# CONFIG_ADFS_FS is not set
# CONFIG_ADFS_FS_RW is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_FAT_FS is not set
# CONFIG_MSDOS_FS is not set
# CONFIG_UMSDOS_FS is not set
# CONFIG_VFAT_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_JFFS_FS is not set
# CONFIG_CRAMFS is not set
# CONFIG_TMPFS is not set
# CONFIG_RAMFS is not set
# CONFIG_ISO9660_FS is not set
# CONFIG_JOLIET is not set
# CONFIG_MINIX_FS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_NTFS_FS is not set
# CONFIG_NTFS_RW is not set
# CONFIG_HPFS_FS is not set
CONFIG_PROC_FS=y
# CONFIG_DEVFS_FS is not set
# CONFIG_DEVFS_MOUNT is not set
# CONFIG_DEVFS_DEBUG is not set
# CONFIG_DEVPTS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_QNX4FS_RW is not set
# CONFIG_ROMFS_FS is not set
CONFIG_EXT2_FS=y
# CONFIG_SYSV_FS is not set
# CONFIG_UDF_FS is not set
# CONFIG_UDF_RW is not set
# CONFIG_UFS_FS is not set
# CONFIG_UFS_FS_WRITE is not set

#
# Network File Systems
#
# CONFIG_CODA_FS is not set
# CONFIG_NFS_FS is not set
# CONFIG_NFS_V3 is not set
# CONFIG_ROOT_NFS is not set
# CONFIG_NFSD is not set
# CONFIG_NFSD_V3 is not set
# CONFIG_SUNRPC is not set
# CONFIG_LOCKD is not set
# CONFIG_SMB_FS is not set
# CONFIG_NCP_FS is not set
# CONFIG_NCPFS_PACKET_SIGNING is not set
# CONFIG_NCPFS_IOCTL_LOCKING is not set
# CONFIG_NCPFS_STRONG is not set
# CONFIG_NCPFS_NFS_NS is not set
# CONFIG_NCPFS_OS2_NS is not set
# CONFIG_NCPFS_SMALLDOS is not set
# CONFIG_NCPFS_NLS is not set
# CONFIG_NCPFS_EXTRAS is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y
# CONFIG_SMB_NLS is not set
# CONFIG_NLS is not set

#
# Sound
#
# CONFIG_SOUND is not set

#
# USB support
#
# CONFIG_USB is not set

#
# Input core support
#
# CONFIG_INPUT is not set
# CONFIG_INPUT_KEYBDEV is not set
# CONFIG_INPUT_MOUSEDEV is not set
# CONFIG_INPUT_JOYDEV is not set
# CONFIG_INPUT_EVDEV is not set

#
# Kernel hacking
#
CONFIG_CROSSCOMPILE=y
# CONFIG_REMOTE_DEBUG is not set
# CONFIG_GDB_CONSOLE is not set
# CONFIG_DEBUG is not set
# CONFIG_MAGIC_SYSRQ is not set
# CONFIG_MIPS_UNCACHED is not set

Re: Malta probs

[Ralf Baechle]

On Tue, Oct 23, 2001 at 02:30:59PM -0700, Petko Manolov wrote:

> > What CPU are you using; can you send me your .config file?
> 
> I am using R4Kc core on Malta board; here is the .config file.
> 
> BTW the kernel silently hang after executing execve("/sbin/init")
> in init/main.c file. I suspect some of the tlb handling code
> which was recently changed is causing the crash. Not having any
> register dump also increase the entropy :-)

It wasn't really changed, the whole lump of arch/mips/mm/ was just
restructured in a way that allows adding of new CPU types and - even
more important - get the code maintainable again.  As it is right now
we had a bunch of almost identical copies of the TLB flushing code,
some even buggy.  Now way I'd continue to deal with that.  So now let's
fix the breakage asap.  As there were no functional changes any bugs
are of rather trivial nature.

  Ralf

Re: Malta probs

[Atsushi Nemoto]

>>>>> On Wed, 24 Oct 2001 02:43:08 +0200, Ralf Baechle <ralf@oss.sgi.com> said:
ralf> It wasn't really changed, the whole lump of arch/mips/mm/ was
ralf> just restructured in a way that allows adding of new CPU types
ralf> and - even more important - get the code maintainable again.  As
ralf> it is right now

In current CVS, All handle_xxx exception handler seems to be complied
with ".set mips3".  Here is a patch.  I think this patch solves the
problem reported by Petko.


diff -urP -x CVS -x .cvsignore linux-sgi-cvs/arch/mips/kernel/entry.S linux.new/arch/mips/kernel/entry.S
--- linux-sgi-cvs/arch/mips/kernel/entry.S	Mon Oct 22 10:29:56 2001
+++ linux.new/arch/mips/kernel/entry.S	Wed Oct 24 21:55:16 2001
@@ -180,6 +180,7 @@
 		END(except_vec3_r4000)
 
 		__FINIT
+		.set    mips0
 
 /*
  * Build a default exception handler for the exceptions that don't need
---
Atsushi Nemoto

Re: Malta probs

[Kevin D. Kissell]

A clue - a machine check exception results
when there are two identical values in the
TLB, which is unhealthy for associative RAM
arrays (never mind that synthesized MIPS
4K and 5K cores may or may not actually
have associative RAM for the TLB).  In the
4K cores, this condition results even if the
two identical values are non-Valid, which was
not true in the R4000 and R5000 CPUs, and
which necessitated a tweak to the TLB flush
and invaldate routines to ensure that each entry
is written with a unique invalid value (a function
of the index).

Please double-check that the TLB flush
code that you are using does this.

            Kevin K.

----- Original Message ----- 
From: "Ralf Baechle" <ralf@oss.sgi.com>
To: "Petko Manolov" <pmanolov@lnxw.com>
Cc: <linux-mips@oss.sgi.com>
Sent: Tuesday, October 23, 2001 10:47 PM
Subject: Malta probs


> On Tue, Oct 23, 2001 at 01:25:26PM -0700, Petko Manolov wrote:
> 
> > The theory looks good, but in reality latest kernel crashes
> > with machine check exception in local_flush_tlb_all on malta
> > board.  I tried both egcs-1.1.2 and gcc-3.0.1 and both are
> > crashing at the same place.
> 
> What CPU are you using; can you send me your .config file?
> 
>   Ralf
> 

Re: Malta probs

[Kevin D. Kissell]

A clue - a machine check exception results
when there are two identical values in the
TLB, which is unhealthy for associative RAM
arrays (never mind that synthesized MIPS
4K and 5K cores may or may not actually
have associative RAM for the TLB).  In the
4K cores, this condition results even if the
two identical values are non-Valid, which was
not true in the R4000 and R5000 CPUs, and
which necessitated a tweak to the TLB flush
and invaldate routines to ensure that each entry
is written with a unique invalid value (a function
of the index).

Please double-check that the TLB flush
code that you are using does this.

            Kevin K.

----- Original Message ----- 
From: "Ralf Baechle" <ralf@oss.sgi.com>
To: "Petko Manolov" <pmanolov@lnxw.com>
Cc: <linux-mips@oss.sgi.com>
Sent: Tuesday, October 23, 2001 10:47 PM
Subject: Malta probs


> On Tue, Oct 23, 2001 at 01:25:26PM -0700, Petko Manolov wrote:
> 
> > The theory looks good, but in reality latest kernel crashes
> > with machine check exception in local_flush_tlb_all on malta
> > board.  I tried both egcs-1.1.2 and gcc-3.0.1 and both are
> > crashing at the same place.
> 
> What CPU are you using; can you send me your .config file?
> 
>   Ralf
> 

Re: Malta probs

[Ralf Baechle]

On Wed, Oct 24, 2001 at 06:47:10PM +0200, Kevin D. Kissell wrote:

> A clue - a machine check exception results
> when there are two identical values in the
> TLB, which is unhealthy for associative RAM
> arrays (never mind that synthesized MIPS
> 4K and 5K cores may or may not actually
> have associative RAM for the TLB).  In the
> 4K cores, this condition results even if the
> two identical values are non-Valid, which was
> not true in the R4000 and R5000 CPUs, and
> which necessitated a tweak to the TLB flush
> and invaldate routines to ensure that each entry
> is written with a unique invalid value (a function
> of the index).
> 
> Please double-check that the TLB flush
> code that you are using does this.

I fixed this problem already last night.

  Ralf

Re: Malta probs

[Petko Manolov]

Atsushi Nemoto wrote:
> 
> In current CVS, All handle_xxx exception handler seems to be complied
> with ".set mips3".  Here is a patch.  I think this patch solves the
> problem reported by Petko.

Yes, Atsushi is right. Adding .set mips0 solved the problem, but
after applying Ralf's patch to tlb-r4k.c

Ralf, i think the patch worth applying to the CVS tree.



	Petko

> diff -urP -x CVS -x .cvsignore linux-sgi-cvs/arch/mips/kernel/entry.S linux.new/arch/mips/kernel/entry.S
> --- linux-sgi-cvs/arch/mips/kernel/entry.S      Mon Oct 22 10:29:56 2001
> +++ linux.new/arch/mips/kernel/entry.S  Wed Oct 24 21:55:16 2001
> @@ -180,6 +180,7 @@
>                 END(except_vec3_r4000)
> 
>                 __FINIT
> +               .set    mips0
> 
>  /*
>   * Build a default exception handler for the exceptions that don't need
> ---
> Atsushi Nemoto

Re: Malta probs

[Ralf Baechle]

On Wed, Oct 24, 2001 at 10:07:29PM +0900, Atsushi Nemoto wrote:

> ralf> just restructured in a way that allows adding of new CPU types
> ralf> and - even more important - get the code maintainable again.  As
> ralf> it is right now
> 
> In current CVS, All handle_xxx exception handler seems to be complied
> with ".set mips3".  Here is a patch.  I think this patch solves the
> problem reported by Petko.

Correct.  In addition there were also assembler options hardwired in
arch/mips/kernel/Makefile which never should have made it there.

  Ralf