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    Subjectioremap()/PCI sickness in 2.4.18-rc2


    On 2.4.18-rc2 with the Dolphin SCI adapters installed and running
    with 2 GB of physical memory installed in the system, ioremap() fails
    to properly map the SCI adapter PREFETCH space. This error does not
    occur opn 2.4.18-rc2 when the physical memory installed in the system
    is less than 1 GB. This error is proceeded by a failure in the PCI
    subsystem to properly allocate resources and reports the following
    message in the /var/log/messages file:


    Feb 20 09:49:38 lnx1 kernel: PCI: PCI BIOS revision 2.10 entry at 0xfdbb1, last bus=2
    Feb 20 09:49:38 lnx1 kernel: PCI: Using configuration type 1
    Feb 20 09:49:38 lnx1 kernel: PCI: Probing PCI hardware
    Feb 20 09:49:38 lnx1 kernel: PCI: Unable to handle 64-bit address for device 00:05.0
    Feb 20 09:49:38 lnx1 kernel: PCI: Unable to handle 64-bit address for device 00:05.1
    Feb 20 09:49:38 lnx1 kernel: PCI: Discovered primary peer bus 02 [IRQ]
    Feb 20 09:49:38 lnx1 kernel: PCI: Using IRQ router ServerWorks [1166/0200] at 00:0f.0
    Feb 20 09:49:38 lnx1 kernel: PCI->APIC IRQ transform: (B0,I2,P0) -> 18
    Feb 20 09:49:38 lnx1 kernel: PCI->APIC IRQ transform: (B0,I6,P0) -> 31
    Feb 20 09:49:38 lnx1 kernel: PCI->APIC IRQ transform: (B0,I15,P0) -> 10
    Feb 20 09:49:38 lnx1 kernel: PCI->APIC IRQ transform: (B1,I0,P0) -> 30
    Feb 20 09:49:38 lnx1 kernel: PCI->APIC IRQ transform: (B2,I2,P0) -> 24

    =====>

    Feb 20 09:49:38 lnx1 kernel: PCI: Cannot allocate resource region 0 of device 00:05.0
    Feb 20 09:49:38 lnx1 kernel: PCI: Cannot allocate resource region 0 of device 00:05.1
    Feb 20 09:49:38 lnx1 kernel: PCI: Failed to allocate resource 1(0-ffffffff) for 00:05.0
    Feb 20 09:49:38 lnx1 kernel: PCI: Failed to allocate resource 1(0-ffffffff) for 00:05.1

    This message does not occur on systems running 2.4.18-rc2 if they have
    less than 1 GB of physical memory installed. The address ranges being
    mapped are as follows, and the SCI adapter reports the attached errors:


    Feb 20 09:49:45 lnx1 sci: Reading IRM driver configuration informaiton from /opt/DIS/sbin/../lib/modules/pcisci.conf
    Feb 20 09:49:45 lnx1 kernel: SCI Driver : Linux SMP support disabled
    Feb 20 09:49:45 lnx1 kernel: SCI Driver : using MTRR
    Feb 20 09:49:45 lnx1 kernel: PCI SCI Bridge - device id 0xd667 found
    Feb 20 09:49:45 lnx1 kernel: 1 supported PCI-SCI bridges (PSB's) found on the system
    Feb 20 09:49:45 lnx1 kernel: Define PSB 1 key: Bus: 2 DevFn: 16
    Feb 20 09:49:45 lnx1 kernel: Key 1: Key: (Bus: 2,DevFn: 16), Device No. 1, irq 24
    Feb 20 09:49:45 lnx1 kernel: Mapping address space non cacheable CSR space: phaddr febe0000 sz 131072 out of 131072
    Feb 20 09:49:45 lnx1 kernel: Mapping address space non cacheable CSR space: vaddr f8914000
    Feb 20 09:49:45 lnx1 kernel: Mapping address space non cacheable IO space: phaddr fd000000 sz 16777216 out of 16777216
    Feb 20 09:49:45 lnx1 kernel: Mapping address space non cacheable IO space: vaddr f8935000
    Feb 20 09:49:45 lnx1 kernel: SCI Adapter 0 : User request to reduce prefetchspace size from 0x20000000 to 0x1c000000

    =====>

    Feb 20 09:49:45 lnx1 kernel: Mapping address space PREFETCH space: phaddr c0000000 sz 469762048 out of 469762048
    Feb 20 09:49:45 lnx1 kernel: Failed to map address space PREFETCH space
    Feb 20 09:49:45 lnx1 kernel: SCI Driver : Adapter init failed!!
    Feb 20 09:49:45 lnx1 kernel: SCI Driver : init failed!
    Feb 20 09:49:45 lnx1 sci: ERROR: IRM Driver failed to load
    Feb 20 09:49:45 lnx1 sci: Check /var/log/scilog for details
    Feb 20 09:49:45 lnx1 rc: Starting sci: failed


    /proc/iomem on the system is reporting the following attached
    hardware devices and their address mappings:


    00000000-0009f3ff : System RAM
    0009f400-0009f7ff : reserved
    000a0000-000bffff : Video RAM area
    000c0000-000c7fff : Video ROM
    000cc000-000ccfff : Extension ROM
    000f0000-000fffff : System ROM
    00100000-3fffffff : System RAM
    00100000-002881d5 : Kernel code
    002881d6-00319977 : Kernel data
    b1fff000-b1ffffff : ServerWorks CNB20HE Host Bridge
    b2000000-b3ffffff : ServerWorks CNB20HE Host Bridge
    b4100000-bc1fffff : PCI Bus #01
    b8000000-bbffffff : ATI Technologies Inc Rage 128 PF

    =========> we are mapping this address range
    c0000000-dfffffff : Dolphin Interconnect Solutions AS PSB66 SCI-Adapter D33x
    fc400000-fc4fffff : PCI Bus #01
    fc4fc000-fc4fffff : ATI Technologies Inc Rage 128 PF
    fc900000-fc9fffff : Intel Corp. 82557 [Ethernet Pro 100]
    fcac0000-fcadffff : Intel Corp. 82543GC Gigabit Ethernet Controller
    fcae0000-fcaeffff : Intel Corp. 82543GC Gigabit Ethernet Controller
    fcafe000-fcafefff : Intel Corp. 82557 [Ethernet Pro 100]
    fcafe000-fcafefff : eepro100
    fcaff000-fcafffff : ServerWorks OSB4/CSB5 OHCI USB Controller
    fd000000-fdffffff : Dolphin Interconnect Solutions AS PSB66 SCI-Adapter D33x
    febe0000-febfffff : Dolphin Interconnect Solutions AS PSB66 SCI-Adapter D33x
    fec00000-fec01fff : reserved
    fee00000-fee00fff : reserved
    fff80000-ffffffff : reserved

    The specific code that is failing is attached. Any ideas as to what
    is broken here? Looks like the mapping code is busted if the system
    has over 1 GB of physical memory with certain hardware. The window
    size we are attempting to map is 512 MB. This works with less than
    1 GB of memory and I have attempted 4GB and 64GB compile options and
    it does not work.

    Jeff


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