linux-kernel - Re: [Intel-gfx] [PATCH 0/4] Compact userptr object backing store allocation

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Date:   Mon, 28 Nov 2016 10:23:49 +0000
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Tvrtko Ursulin <tursulin@...ulin.net>,
        Intel-gfx@...ts.freedesktop.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [Intel-gfx] [PATCH 0/4] Compact userptr object backing store
 allocation


On 14/11/2016 11:45, Tvrtko Ursulin wrote:
>
> Hi Andrew,
>
> On 11/11/2016 08:50, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
>>
>> Userptr backing store with SWIOTBL active is currently allocated in
>> the same
>> inefficient manner, with one sg entry per object page, as what the commit
>> 871dfbd67d4e ("drm/i915: Allow compaction upto SWIOTLB max segment
>> size") fixed
>> for regular GEM objects.
>>
>> We can fix that by adding new a __sg_alloc_table_from_pages core
>> function which
>> allows us to control the maximum desired coalesced segment size.
>>
>> Other than that the series starts with two simple fixes to
>> sg_alloc_table_from_pages which deal with incorrect data type usage and a
>> theoretical overflow condition. Fixing the latter enables easy
>> addition of the
>> above mentioned __sg_alloc_table_from_pages.
>>
>> Tvrtko Ursulin (4):
>>   lib/scatterlist: Fix offset type in sg_alloc_table_from_pages
>>   lib/scatterlist: Avoid potential scatterlist entry overflow
>>   lib/scatterlist: Introduce and export __sg_alloc_table_from_pages
>>   drm/i915: Use __sg_alloc_table_from_pages for userptr allocations
>>
>>  drivers/gpu/drm/i915/i915_drv.h                |  9 +++
>>  drivers/gpu/drm/i915/i915_gem.c                | 15 +----
>>  drivers/gpu/drm/i915/i915_gem_userptr.c        | 28 ++-------
>>  drivers/media/v4l2-core/videobuf2-dma-contig.c |  4 +-
>>  drivers/rapidio/devices/rio_mport_cdev.c       |  4 +-
>>  include/linux/scatterlist.h                    | 11 ++--
>>  lib/scatterlist.c                              | 78
>> ++++++++++++++++++++------
>>  7 files changed, 87 insertions(+), 62 deletions(-)
>
> I have three patches to lib/scatterlist.c in this series which has all
> been reviewed and tested.
>
> We would like to merge them via the DRM tree if there are no objections?

Excuse me for the re-ping - still looking for an ack to merge these few 
patches via the drm tree. (The code in question does not have a 
designated maintainer.)

Regards,

Tvrtko