Re: Enabling peer to peer device transactions for PCIe devices

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Nov 24, 2016 at 10:45:18AM +0100, Christian König wrote:
> Am 24.11.2016 um 00:25 schrieb Jason Gunthorpe:
> >There is certainly nothing about the hardware that cares
> >about ZONE_DEVICE vs System memory.
> Well that is clearly not so simple. When your ZONE_DEVICE pages describe a
> PCI BAR and another PCI device initiates a DMA to this address the DMA
> subsystem must be able to check if the interconnection really works.

I said the hardware doesn't care.. You are right, we still have an
outstanding problem in Linux of how to generically DMA map a P2P
address - which is a different issue from getting the P2P address from
a __user pointer...

Jason
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux