[Intel-gfx] [PATCH v5 09/19] Doc/gpu/rfc/i915: i915 DG2 64k pagesize uAPI

Lucas De Marchi lucas.demarchi at intel.com
Fri Feb 18 05:39:16 UTC 2022

On Tue, Feb 01, 2022 at 04:11:22PM +0530, Ramalingam C wrote:
>Details of the 64k pagesize support added as part of DG2 enabling and its
>implicit impact on the uAPI.
>v2: improvised the Flat-CCS documentation [Danvet & CQ]
>v3: made only for 64k pagesize support
>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>cc: Daniel Vetter <daniel.vetter at ffwll.ch>
>cc: Matthew Auld <matthew.auld at intel.com>
>cc: Simon Ser <contact at emersion.fr>
>cc: Pekka Paalanen <ppaalanen at gmail.com>
>Cc: Jordan Justen <jordan.l.justen at intel.com>
>Cc: Kenneth Graunke <kenneth at whitecape.org>
>Cc: mesa-dev at lists.freedesktop.org
>Cc: Tony Ye <tony.ye at intel.com>
>Cc: Slawomir Milczarek <slawomir.milczarek at intel.com>
> Documentation/gpu/rfc/i915_dg2.rst | 25 +++++++++++++++++++++++++
> Documentation/gpu/rfc/index.rst    |  3 +++
> 2 files changed, 28 insertions(+)
> create mode 100644 Documentation/gpu/rfc/i915_dg2.rst
>diff --git a/Documentation/gpu/rfc/i915_dg2.rst b/Documentation/gpu/rfc/i915_dg2.rst
>new file mode 100644
>index 000000000000..f4eb5a219897
>--- /dev/null
>+++ b/Documentation/gpu/rfc/i915_dg2.rst
>@@ -0,0 +1,25 @@
>+I915 DG2 RFC Section
>+Upstream plan
>+Plan to upstream the DG2 enabling is:
>+* Merge basic HW enabling for DG2 (Still without pciid)
>+* Merge the 64k support for lmem
>+* Merge the flat CCS enabling patches
>+* Add the pciid for DG2 and enable the DG2 in CI

does this make sense after the fact? Earlier version of this patch
Daniel Vetter asked this to be moved to the be the first patch. I see
you added it in the cover letter, but keeping this in
gpu/rfc/i915_dg2.rst doesn't make much sense IMO. Maybe just drop this

Lucas De Marchi

>+64K page support for lmem
>+On DG2 hw, local-memory supports minimum GTT page size of 64k only. 4k is not
>+supported anymore.
>+DG2 hw doesn't support the 64k (lmem) and 4k (smem) pages in the same ppgtt
>+Page table. Refer the struct drm_i915_gem_create_ext for the implication of
>+handling the 64k page size.
>+.. kernel-doc:: include/uapi/drm/i915_drm.h
>+        :functions: drm_i915_gem_create_ext
>diff --git a/Documentation/gpu/rfc/index.rst b/Documentation/gpu/rfc/index.rst
>index 91e93a705230..afb320ed4028 100644
>--- a/Documentation/gpu/rfc/index.rst
>+++ b/Documentation/gpu/rfc/index.rst
>@@ -20,6 +20,9 @@ host such documentation:
>     i915_gem_lmem.rst
>+.. toctree::
>+    i915_dg2.rst
> .. toctree::
>     i915_scheduler.rst

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