[PATCH 1/2] drm: allow limiting the scatter list size.

Gerd Hoffmann kraxel at redhat.com
Tue Aug 18 04:27:03 EDT 2020

On Tue, Aug 18, 2020 at 09:57:59AM +0200, Christian König wrote:
> Am 18.08.20 um 09:48 schrieb Gerd Hoffmann:
> > Add max_segment argument to drm_prime_pages_to_sg().  When set pass it
> > through to the __sg_alloc_table_from_pages() call, otherwise use
> > 
> > Also add max_segment field to gem objects and pass it to
> > drm_prime_pages_to_sg() calls in drivers and helpers.
> > 
> > Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
> I'm missing an explanation why this should be useful (it certainly is).

virtio-gpu needs this to work properly with SEV (see patch 2/2 of this

> And the maximum segment size seems misplaced in the GEM object. This is
> usually a property of the device or even completely constant.

Placing it in drm_device instead would indeed work for virtio-gpu, so I
guess you are suggesting that instead?

take care,

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