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 <[email protected]> cc: Daniel Vetter <[email protected]> cc: Matthew Auld <[email protected]> cc: Simon Ser <[email protected]> cc: Pekka Paalanen <[email protected]> Cc: Jordan Justen <[email protected]> Cc: Kenneth Graunke <[email protected]> Cc: [email protected] Cc: Tony Ye <[email protected]> Cc: Slawomir Milczarek <[email protected]> --- 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: i915_gem_lmem.rst +.. toctree:: + i915_dg2.rst + .. toctree:: i915_scheduler.rst -- 2.20.1
