Re: [PATCH v1 2/2] dma-mapping-common: add DMA attribute - DMA_ATTR_IOMMU_BYPASS

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

 



On Tuesday 03 November 2015 07:13:28 Benjamin Herrenschmidt wrote:
> On Mon, 2015-11-02 at 14:07 +0200, Shamir Rabinovitch wrote:
> > On Mon, Nov 02, 2015 at 09:00:34PM +1100, Benjamin Herrenschmidt
> > wrote:
> > > 
> > > Chosing on a per-mapping basis *in the back end* might still make
> > > some
> > 
> > In my case, choosing mapping based on the hardware that will use this
> > mappings makes more sense. Most hardware are not that performance 
> > sensitive as the Infiniband hardware.
> 
>  ...
> 
> > The driver know for what hardware it is mapping the memory so it know 
> > if the memory will be used by performance sensitive hardware or not.
> 
> Then I would argue for naming this differently. Make it an optional
> hint "DMA_ATTR_HIGH_PERF" or something like that. Whether this is
> achieved via using a bypass or other means in the backend not the
> business of the driver.
> 

With a name like that, who wouldn't pass that flag? ;-)

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



[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux