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

Ramalingam C ramalingam.c at intel.com
Tue Feb 1 10:41:22 UTC 2022

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
+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:
+.. toctree::
+    i915_dg2.rst
 .. toctree::

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