[Intel-gfx] [PATCH] drm/i915/lmem: add the fake lmem region

[Matthew Auld]

On Tue, 29 Oct 2019 at 16:51, Matthew Auld <matthew.auld at intel.com> wrote:
>
> Intended for upstream testing so that we can still exercise the LMEM
> plumbing and !i915_ggtt_has_aperture paths. Smoke tested on Skull Canyon
> device. This works by allocating an intel_memory_region for a reserved
> portion of system memory, which we treat like LMEM. For the LMEMBAR we
> steal the aperture and 1:1 it map to the stolen region.
>
> To enable simply set the i915 modparam fake_lmem_start= on the kernel
> cmdline with the start of reserved region(see memmap=). The size of the
> region we can use is determined by the size of the mappable aperture, so
> the size of reserved region should be >= mappable_end. For now we only
> enable for the selftests. Depends on CONFIG_DRM_I915_UNSTABLE being
> enabled.
>
> eg. memmap=2G$16G i915.fake_lmem_start=0x400000000

Hi Arek,

Would you be able to update the fi-skl-lmem kernel cmd line with
s/i915_fake_lmem_start/i915.fake_lmem_start?