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    SubjectAgain: Redhat 6.0 kernel paging fails
    I sent SOS last week and haven't got any response yet.  I ahve tried using
    kmalloc insstead of vmalloc but the result is the same with only different
    memory address being allocated. Anyone canhelp here, or point out how I can
    dubug the problem.

    Many thanks!


    -----Original Message-----
    From: WANG,YIDING (HP-SanJose,ex1)
    Sent: Friday, June 11, 1999 11:42 AM
    To: 'linux_kernel'
    Cc: 'Vineet Abraham'
    Subject: Redhat 6.0 kernel paging fails

    I am writing an Fibre Channel HBA device driver on Redhat 6.0 x86 platform
    and need help on three questions so far:

    1, I use vmalloc to get 170f0 byte virtual memory and
    allocation OK, got memory starting at c2885000;

    kmalloc to get 0x5808 byte DMA virtual memory and
    allocation OK, got memory starting at c0760000;
    DMA virt_addr is converted to phys_addr with "virt_to_bus"
    and get 760000.

    When access those memories, system gives meesage:
    "Unable to handle kernel paging request at virtual address 0001c000"

    Since I amnot familiar wit hLinux environment yet and don't know
    what to to with those register value and trace, thought someone
    might be able t help on the case.

    Following is the messages:
    HPFC: DetectHBA!
    HPFC: fcInitializeDriver OK!
    HPFC: ProbeHBA!
    HPFC: ProbeCard!
    HPFC: hpfc_adapter_count = 1!
    HPFC: InitCardInfo!
    HPFC: IOL = 6500, IOH = 6600
    HPFC: Call vmalloc to get 170f0 byte mem
    HPFC: vmalloc got memory at c2885000
    HPFC: DMA alignment = 800
    HPFC: kmalloc to get DMA memory 5808
    HPFC: kmalloc got DMA memory at c0760000
    HPFC: phys_dma_addr = 760000
    HPFC: Memory allocated! virtaddr = c0760000, physaddr=760000
    HPFC: Call check_region
    HPFC: Call request_region
    HPFC: Call request_irq
    HPFC: Call InitCard
    Unable to handle kernel paging request at virtual address 0001c000
    current->tss.cr3 = 00222000, %cr3 = 00222000
    *pde = 00000000
    Oops: 0000
    CPU: 0
    EIP: 0010:[<c284ce2e>]
    EFLAGS: 00010206
    eax: 00000000 ebx: 00004000 ecx: c078007c edx: 0001c000
    esi: c2892e78 edi: 0001c000 ebp: c1f21a38 esp: c1f21a40
    ds: 0018 es: 0018 ss: 0018
    Process insmod (pid: 500, process nr: 6, stackpage=c1f21000)
    Stack: c078007c 0001c000 c1f21a64 c285a7ca c078007c 0001c000
    c2892e78 c078007c
    00000000 c1f21a84 c285a26f c078007c 0001c000 c2892e78
    00004000 c289b468
    c2892e78 c1f21aa0 c2859f10 c078007c c2892e78 c289b468
    c078007c c289bb08
    Call Trace: [<c285a7ca>] [<c2892e78>] [<c285a26f>] [<c2892e78>]
    [<c289b468>] [<c2892e78>] [<c2859f10>] [<c2892e78>]
    [<c289bb08>] [<c2859d1b>] [<c289b468>] [<c2858d43>]
    [<c2892e78>] [<c289bb08>] [<c289b468>] [<c2899878>]
    [<c2885000>] [vgacon_cursor+433/440] [<c2896e78>]
    [<c284ba99>] [<c2885000>] [<c286a955>] [<c284b52d>]
    [<c284b04d>] [<c28606a4>] [do_bottom_half+69/100]
    [<c284b048>] [ret_from_intr+0/32] [<c28742a0>]
    [scsi_register_host+67/580] [<c28742a0>] [<c28742a0>]
    [<c28742a0>] [<c284b000>] [<c284ccbd>] [<c28742a0>]
    [sys_init_module+1107/1212] [<c284b000>] [<c2882420>]
    [<c284b048>] [system_call+52/56] [<c284b000>]
    localhost kernel: Code: 0f b6 04 02 c9 c3 55 89 e5 8b 45 08 8b 55 0c 8b 40
    04 8b 40

    Following is the piece of code:

    if (!(pAdapterInfo->fcMemVirtPtr =
    printk(KERN_WARNING "HPFC: memory allocation error!");
    return HPFC_FAIL;

    memset((void *)pAdapterInfo->fcMemVirtPtr, 0,

    FC requires DMA memory alignment. It needs to be
    implemented here since OS doesn't take care of it.
    align_offset = pDriverInfo->fcDmaPhysAlign - 1;

    /* TBD, here kmalloc has limitation of 128k - 24 byte (131048).
    Need to find a way of doing it later */
    if (!(pAdapterInfo->fcDmaVirtAlloc =
    (caddr_t)kmalloc(pDriverInfo->fcDmaSize + align_offset,
    printk(KERN_WARNING "HPFC: DMA memory allocation error!");
    return HPFC_FAIL;

    memset((void *)pAdapterInfo->fcDmaVirtAlloc, 0,

    /* convert to physical memory address with alignment */
    physmemaddr = virt_to_bus(pAdapterInfo->fcDmaVirtAlloc);
    pAdapterInfo->fcDmaPhysLow32 =
    (physmemaddr + align_offset) & ~align_offset;
    pAdapterInfo->fcDmaPhysUp32 = 0;

    /* calculate aligned virtual memory address */
    pAdapterInfo->fcDmaVirtPtr = (caddr_t)((U32)(pAdapterInfo->
    fcDmaVirtAlloc) + (pAdapterInfo->fcDmaPhysLow32 -

    During the insmod, it fails and system oops.

    What is the problem here?

    2, What driver should do if needs to allocate large memory (say 256K, DMA
    and NON-DMA)?

    3, Each time insmod fails, module is registered anyway. After changing
    code and recompile, the module cannot be re-insmod since the module
    name exists already. Tried to use rmmod but wont work. What is the
    best way to get rid of old module name instead of reboot system?

    Many Thx!


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