general issue with suspend/resume with iwn(4)/bge(4)

[John Baldwin]

On Monday 09 November 2009 1:14:18 pm Serge Semenenko wrote:
>  John Baldwin wrote: 
> On Sunday 08 November 2009 6:19:09 am Bernhard Schmidt wrote:
>   
> Hi,
> 
> I hope this is the correct list for an issue like that, if not, a pointer 
> would be appreciated.
> 
> I've been in contact with Mykola Dzham quite some time now and we are trying 
> to figure out a resume issue on his iwn(4) device. It does seem that this 
> device does not come up correctly after suspend. The interesting part is, 
that 
> even pciconf -l -bcv ist not able to get all information.
> 
> Before suspend:
> iwn0 at pci0:6:0:0:        class=0x028000 card=0x13018086 chip=0x42328086 
> rev=0x00 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Carte Intel WiFi Link 5100 AGN (Intel WiFi Link 5100)'
>     class      = network
>     bar   [10] = type Memory, range 64, base 0xec800000, size 8192, enabled
>     cap 01[c8] = powerspec 3  supports D0 D3  current D0
>     cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
>     cap 10[e0] = PCI-Express 1 endpoint max data 128(128) link x1(x1)
> 
> After resume:
> iwn0 at pci0:6:0:0:        class=0x028000 card=0x13018086 chip=0x42328086 
> rev=0x00 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Carte Intel WiFi Link 5100 AGN (Intel WiFi Link 5100)'
>     class      = network
>     
> 
> Are you sure you didn't forget the extra options to pciconf here?  The bar
> should definitely not disappear since we save that state in software, not
> in hardware.  Also, the capability pointer register is set by the hardware,
> software never changes it.
> 
>   
> 
>  It looks similar to PR http://www.freebsd.org/cgi/query-pr.cgi?pr=135070 
for me. And if I understood right you're already working on the solution...

No, having the capability registers and a BAR disappear after they were 
programmed is entirely different.  That PR is about being able to allocate 
space for the BAR on boot, not about losing it entirely after resume.

-- 
John Baldwin