Re: [Xen-devel] Re: pv_ops dom0 USB fixed

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Andrew Lyon wrote:
> With 2.6.27 they are detected, and I notice the controller gets a different irq:
>
>  dmesg | grep -E "ata|scsi|ahci"
> PERCPU: Allocating 42976 bytes of per cpu data
> Memory: 3626568k/3847580k available (3374k kernel code, 212420k
> reserved, 1712k data, 288k init)
> libata version 3.00 loaded.
> ahci 0000:00:1f.2: version 3.0
> ahci 0000:00:1f.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
>   
Yes, that's OK.  In a dom0 kernel devices will generally get a different 
irq.  The important thing is that it has the same GSI (18, in this 
case).  In native linux irq == gsi, but in dom0 they're remapped (to 
make room for irqs for non-hardware events).
> ahci 0000:00:1f.2: AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x27 impl SATA mode
> ahci 0000:00:1f.2: flags: 64bit ncq sntf pm led clo pmp pio slum part ems
> ahci 0000:00:1f.2: setting latency timer to 64
> scsi0 : ahci
> scsi1 : ahci
> scsi2 : ahci
> scsi3 : ahci
> scsi4 : ahci
> scsi5 : ahci
> ata1: SATA max UDMA/133 irq_stat 0x00000040, connection status changed irq 18
>   
So this is where things start falling apart.  I'm guessing there's some 
DMA problem; either the drive isn't getting the right command, or we're 
not seeing a proper response.  I suspect the former, since the error 
message is a timeout rather than complains about bad data.
   J

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