[openfabrics-ewg] FW: Mstflint - not working on ppc64 andwhendriver is notloaded on AMD

[Moshe Kazir]

Michael Wrote :

> OK, so for OFED just mmap from /proc/bus/pci/ should be sufficient 
> work-around - it will make things work when driver is loaded. Correct?

No !
A work-around that enable the use of mstflint only when the driver is
loaded is not sufficient 

What you plan to do when you have system error ->
- boot fail when IB started,
- driver loading fail as result of driver error / miss match FWR, etc.

When driver is not loaded/operating o.k.  We must be able to check the
HCA FWR version, and reload  FWR if needed.

Having mstflint working only when driver is loaded o.k. will not permit
us to access the HCA in this case !!

Moshe
 



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Moshe Katzir   |  +972-9971-8639 (o)   |   +972-52-860-6042  (m)
 
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-----Original Message-----
From: Michael S. Tsirkin [mailto:mst at mellanox.co.il] 
Sent: Sunday, October 01, 2006 9:51 AM
To: Tseng-Hui (Frank) Lin
Cc: Moshe Kazir; openfabrics-ewg at openib.org; openib-general at openib.org
Subject: Re: FW: Mstflint - not working on ppc64 andwhendriver is
notloaded on AMD


Quoting r. Tseng-Hui (Frank) Lin <thlin at us.ibm.com>:
> Subject: RE: FW: Mstflint - not working on ppc64 andwhendriver is 
> notloaded on AMD
> 
> The ppc64 problem is actually in pci_64.c. Here is the patch:
> 
> ============ cut here =============
> diff --git a/arch/powerpc/kernel/pci_64.c 
> b/arch/powerpc/kernel/pci_64.c index 4c4449b..490403c 100644
> --- a/arch/powerpc/kernel/pci_64.c
> +++ b/arch/powerpc/kernel/pci_64.c
> @@ -734,9 +734,7 @@ static struct resource *__pci_mmap_make_
>  	if (hose == 0)
>  		return NULL;		/* should never happen */
>  
> -	/* If memory, add on the PCI bridge address offset */
>  	if (mmap_state == pci_mmap_mem) {
> -		*offset += hose->pci_mem_offset;
>  		res_bit = IORESOURCE_MEM;
>  	} else {
>  		io_offset = (unsigned long)hose->io_base_virt -
pci_io_base; 
> ============= end cut =============
> 
> The mmap() system call on resource0 does not work on ppc64 without 
> this patch. PowerMAC G5 got away with this because its 
> hose->pci_mem_offset was set to 0.
> 
> The fix is made on 8/21. It may be able to make it into 2.6.19. But it

> certainly won't get into SLES10, SLES9-SP3, or REHL4-U4 which have 
> already been released.
> 
> To cover both cases with and without the fix, my patch try to mmap 
> /sys/bus/pci/..../resource0 first. It it failed it tries mmap 
> /proc/bus/pci/.... If it failed again, we have no choice but fall back

> to use PCI config space.

OK, so for OFED just mmap from /proc/bus/pci/ should be sufficient 
work-around - it will make things work when driver is loaded. Correct?

-- 
MST