[Xen-bugs] [Bug 393] New: dom0 OpenIPMI driver neither finds nor initializes BMC

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=393

           Summary: dom0 OpenIPMI driver neither finds nor initializes BMC
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: critical
          Priority: P1
         Component: Hardware Support
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: aball@xxxxxxxxxx
                CC: hohnbaum@xxxxxxxxxx,niv@xxxxxxxxxx


Problem description: The dom0 Linux kernel's ipmi_si module fails to detect the
BMC on an HS20 8843-25U blade.  When given the BMC's port number manually, the
module fails to initialize the BMC. 

This is on Xen-unstable changeset 7701:abbe3df33774 .

Excerpt from dmesg with the Xen domain 0 Linux kernel:
[Linux ibmhc1blade10 2.6.12.6-xen0 #1 Thu Nov 3 22:16:46 EST 2005 i686 i686 i386
GNU/Linux]:

ipmi message handler version v33
IPMI System Interface driver version v33, KCS version v33, SMIC version v33, BT
version v33
ipmi_si: Trying "kcs" at I/O port 0xca2
ipmi_si: Trying "smic" at I/O port 0xca9
ipmi_si: Trying "bt" at I/O port 0xe4
ipmi_si: Unable to find any System Interface(s)

Excerpt from dmesg with the default RHEL 4 Update 2 i386 Linux kernel
[Linux ibmhc1blade10 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 i686
i686 i386 GNU/Linux]:

ipmi message handler version 33.4
IPMI System Interface driver version 33.4, KCS version 33.4, SMIC version 33.4,
BT version 33.4
ipmi_si: Found SMBIOS-specified state machine at I/O address 0xca8, slave
address 0x20
 IPMI kcs interface initialized
ipmi device interface version 33.4

We have seen what appears to be the same problem in 64-bit RHEL 4 Update 2 on a
blade of the same type.

Note that in the dom0 kernel, the I/O address probed for the BMC for KCS is
incorrect and SMBIOS is not mentioned in the kernel messages.  Running
'dmidecode' in dom0 shows a correct type 38 entry for the BMC.

Steps to reproduce:

(1) Build a dom0 kernel with IPMI support.  The relevant section of
linux-2.6.12-xen0/.config is copied here:
#
# IPMI
#
# CONFIG_IPMI_HANDLER is not set

with

#
# IPMI
#
CONFIG_IPMI_HANDLER=m
# CONFIG_IPMI_PANIC_EVENT is not set
CONFIG_IPMI_DEVICE_INTERFACE=m
CONFIG_IPMI_SI=m
CONFIG_IPMI_WATCHDOG=m
CONFIG_IPMI_POWEROFF=m

Alternatively, you can select OpenIPMI support via

cd linux-2.6-xen0
make ARCH=xen menuconfig

(3) Build and install the Xen Linux kernel with OpenIPMI support:
# from inside linux-2.6-xen0
make ARCH=xen
# as root
make ARCH=xen INSTALL_PATH=/ modules_install install

(4) Make initrd's for the Xen dom0 and domU kernels and boot into dom0.

(5) Load the ipmi_si kernel module as root:
    modprobe ipmi_si

Additional information:

It looks like isa_memcpy_fromio(buf, 0xfdfe0, 15) is copying all zeros to buf in
ipmi_si_intf.c:dmi_decode().  This causes the SMBIOS entry point's intermediate
anchor string ('_DMI_') not to be found (it's at physical address 0xfdfe0 on
this machine).

Using

modprobe ipmi_si ports=0xca8

fails as well, with the following messages from the dom0 Linux kernel:

IPMI System Interface driver version v33, KCS version v33, SMIC version v33, BT
version v33
ipmi_si: Trying "kcs" at I/O port 0xca8
ipmi_si: Unable to find any System Interface(s)

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