Zitat von Philippe Gerum <[EMAIL PROTECTED]>:
> Bernhard Pfund wrote:
>> Philippe Gerum wrote:
>>> Bernhard Pfund wrote:
>>>>> I see no option aside of ironing the inner code that reads/writes the PCI
>>>>> config, so here is an ugly yet possible solution for x86, that might work
>>>>> (totally untested):
>>>>>
>>>>> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
>>>>> index 6e64aaf..7f32101 100644
>>>>> --- a/arch/x86/pci/common.c
>>>>> +++ b/arch/x86/pci/common.c
>>>>> @@ -75,7 +75,7 @@ int pcibios_scanned;
>>>>> * This interrupt-safe spinlock protects all accesses to PCI
>>>>> * configuration space.
>>>>> */
>>>>> -DEFINE_SPINLOCK(pci_config_lock);
>>>>> +IPIPE_DEFINE_SPINLOCK(pci_config_lock);
>>>>>
>>>>> static int __devinit can_skip_ioresource_align(const struct
>>>>> dmi_system_id *d)
>>>>> {
>>>>> diff --git a/drivers/pci/access.c b/drivers/pci/access.c
>>>>> index 39bb96b..9a74083 100644
>>>>> --- a/drivers/pci/access.c
>>>>> +++ b/drivers/pci/access.c
>>>>> @@ -12,7 +12,7 @@
>>>>> * configuration space.
>>>>> */
>>>>>
>>>>> -static DEFINE_SPINLOCK(pci_lock);
>>>>> +static IPIPE_DEFINE_SPINLOCK(pci_lock);
>>>>>
>>>>> /*
>>>>> * Wrappers for all PCI configuration access functions. They
>>>>> just check
>>>>>
>>>> This results in:
>>>>
>>>> arch/x86/pci/common.c:78: error: conflicting types for ‘pci_config_lock’
>>>> arch/x86/pci/pci.h:84: error: previous declaration of ‘pci_config_lock’
>>>> was here
>>>>
>>>> Didn't look into it, just tried ;)
>>>>
>>> Just change the declaration in pci.h the same way.
>>>
>>
>> Ok, thanx! Seems to work for now, no extensive testing done (yet)
>> though. What's the plan for the future? Will this change find its way
>> into the official patch?
>>
>
> This change could be merged into the 2.6.26 patch provided it does
> not raise any
> pathological latency when enabling MSI. I would rather ask people to refrain
> from using MSI until it is fixed (once again) in later releases,
> than suffering
> random latency peaks. 2.6.27 and beyond is another issue; this will need a
> different approach than simply ironing the PCI lock in any case.
>
> We need more test data for 2.6.26 + this patch.
>
Let me know if I can be of any help. I'm in an early stage of the
project, so there's some time available for MSI experiments...
Bernhard
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