lkml.org 
[lkml]   [2022]   [Apr]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
From
On 2022-04-28 15:45, Christoph Hellwig wrote:
> On Thu, Apr 28, 2022 at 03:44:36PM +0100, Robin Murphy wrote:
>> Rather than introduce this extra level of allocator complexity, how about
>> just dividing up the initial SWIOTLB allocation into multiple io_tlb_mem
>> instances?
>
> Yeah. We're almost done removing all knowledge of swiotlb from drivers,
> so the very last thing I want is an interface that allows a driver to
> allocate a per-device buffer.

FWIW I'd already started thinking about having a distinct io_tlb_mem for
non-coherent devices where vaddr is made non-cacheable to avoid the
hassle of keeping the arch_dma_sync_* calls lined up, so I'm certainly
in favour of bringing in a bit more flexibility at this level :)

Robin.

\
 
 \ /
  Last update: 2022-04-28 16:58    [W:0.078 / U:0.312 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site