On platforms where the GSC is part of GT, it needs to communicate with CSME for some of its operations. However, there is no direct HW communication channel, so the i915 and mei drivers must carry the messages back and forth between the 2 units. The protocol is fully described in the i915 patch that adds the initial support, but it basically amounts to SW blindly moving messages back and forth until the GSC tells us to stop. Implementing this features requires a new mei component to handle the mei side of things. The patches for this have already been reviewed on the char-misc ML and we already have an ack from Greg to merge them via the drm tree [1]. v2: small fixes, better docs, code cleanup [1] https://lore.kernel.org/lkml/20230208142358.1401618-1-tomas.winkler@xxxxxxxxx/t/ Cc: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx> Cc: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> Cc: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Alexander Usyskin (2): drm/i915/mtl: Define GSC Proxy component interface mei: gsc_proxy: add gsc proxy driver Daniele Ceraolo Spurio (2): drm/i915/gsc: add initial support for GSC proxy drm/i915/gsc: add support for GSC proxy interrupt drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gt/intel_gt_irq.c | 22 +- drivers/gpu/drm/i915/gt/intel_gt_regs.h | 3 + drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c | 424 ++++++++++++++++++ drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.h | 18 + drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c | 66 ++- drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.h | 17 +- .../i915/gt/uc/intel_gsc_uc_heci_cmd_submit.h | 1 + drivers/misc/mei/Kconfig | 2 +- drivers/misc/mei/Makefile | 1 + drivers/misc/mei/gsc_proxy/Kconfig | 14 + drivers/misc/mei/gsc_proxy/Makefile | 7 + drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c | 208 +++++++++ include/drm/i915_component.h | 3 +- include/drm/i915_gsc_proxy_mei_interface.h | 53 +++ 15 files changed, 830 insertions(+), 10 deletions(-) create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.h create mode 100644 drivers/misc/mei/gsc_proxy/Kconfig create mode 100644 drivers/misc/mei/gsc_proxy/Makefile create mode 100644 drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c create mode 100644 include/drm/i915_gsc_proxy_mei_interface.h -- 2.40.0
