[PATCH v2 2/2] drm/i915/gem: Calculate object page offset for partial memory mapping

[Andi Shyti]

Hi Nirmoy,

On Thu, Apr 11, 2024 at 04:18:41PM +0200, Nirmoy Das wrote:
> Hi Andi,
> 
> On 3/29/2024 5:39 PM, Andi Shyti wrote:
> > To enable partial memory mapping of GPU virtual memory, it's
> > necessary to introduce an offset to the object's memory
> > (obj->mm.pages) scatterlist. This adjustment compensates for
> > instances when userspace mappings do not start from the beginning
> > of the object.
> 
> I quickly tried https://gitlab.freedesktop.org/llandwerlin/igt-gpu-tools/-/tree/wip/gem_mmap_offset-partial-unmap?ref_type=heads
> that didn't work for GTT.
> 
> Please make sure a proper IGT test is available for this as this looks very
> risky change.

Yes, I have igt's ready and a new v3.

Thanks for trying this out.

Andi