Re: aic7xxx: aic7892(B): BUG: soft lockup detected on CPU#0!

[thomas schorpp <t.schorpp@gmx.de>]

thomas schorpp wrote:
> thomas schorpp wrote:
>> James Bottomley wrote:
>>> On Sat, 2007-03-24 at 01:51 +0100, thomas schorpp wrote:
>>>>> no. so the pci layer reports wrong start:
>>>> nonsense. it succeeds, confused function return with the error flag:
>>>>
>>>> //      u_long  start;
>>>> //      u_long  start = 0xFFEFF000;
>>>>         u_long  start = 0x30000000;
>>>>         int     error;
>>>>
>>>>         struct resource* ret1;
>>>>         error = 0;
>>>> //      start = pci_resource_start(ahc->dev_softc, 1);
>>>>         if (start != 0) {
>>>>                 *bus_addr = start;
>>>>                 if ((ret1 = request_mem_region(start, 0x1000, 
>>>> "aic7xxx")) == 0)
>>>
>>> You can't do this.  The pci_resource_start is getting the address of
>>> something called a Bus Address Register (BAR) it says in physical
>>> address space where the card is responding ... you can't simply set that
>>> to a random value.
>>>
>>> The problem you seem to have is that your system is reporting a BAR
>>> beyond 32 bits (4GB) which the card physically can't use.  This could be
>>> because of a BIOS misconfiguration or because there's a bug in the PCI
>>> subsystem somewhere.
>>>
>>> James
>>
>> understood. waiting for LKML answers... meanwhile i found harder 
>> reason for a possible bounds problem with the driver code on x86_64:
>>
>> if i do:
>>
>> static int
>> ahc_linux_pci_reserve_mem_region(struct ahc_softc *ahc,
>>                                 u_long *bus_addr,
>>                                 uint8_t __iomem **maddr)
>> {
>> //      u_long  start;
>>        uint32_t start;
>>
>> i get no free warning of "*nonexistant* resource" (it cant be 
>> nonexistant, cause it was definitely something mapped):
>>
>> tom1:/usr/src/linux# dmesg |grep -i free
>> Freeing unused kernel memory: 208k freed
>>
>> with u_long type start i get it:
>> Mar 24 03:41:47 localhost kernel: Trying to free nonexistent resource 
>> <00000000fffff000-00000000ffffffff>
>>
>> investigating further...
>> -
> 
> hmm well i dont get the free warning cause
>                        release_mem_region(ahc->platform_data->mem_busaddr,
>                                           0x1000);
> isnt called, the hack fails
>        error = ahc_linux_pci_reserve_mem_region(ahc, &base, &maddr);
>        if (error == 0) {
> 
> ok, so no bounds issue in the driver.
> 

LKML people are ignoring my report, i take this as agreement to a mb bios issue.
will test the card with a latest debian kernel x86_64 netinstall cd on some other amd64 
machine, but i need to find some in my reach here.
i need more confirmation before working in the linux pci hal.

y
tom