Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64

Matthew Wilcox wrote:

So, let me try to understand ... your hardware allows writes from the
device to pass other writes from the device?  Doesn't that violate the
PCI spec?  I'm thinking about this (page 43 of PCI 2.3):

Hi Matthew,

Yes I believe this behavior on sn2 is 'bending' the PCI spec a bit. The
problem is that the NUMA fabric is a routed network in itself so there
can be multiple paths between the device and the physical memory it DMAs
to/from.

Cheers,
Jes
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---

• References:
  • [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64
    • From: [email protected]
  • Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64
    • From: Jes Sorensen <[email protected]>
  • Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64
    • From: [email protected]
  • Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64
    • From: Matthew Wilcox <[email protected]>

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