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
v3: add extra check on proxy status after the init flow is done, address
checkpatch issues
[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_fw.c | 10 +
drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.h | 1 +
drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c | 425 ++++++++++++++++++
drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.h | 18 +
drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c | 76 +++-
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 +++
17 files changed, 852 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
