RE: [PATCH v5 00/15] drm/i915: HuC loading for DG2

["Winkler, Tomas" <tomas.winkler@intel.com>]

> 
> On DG2, HuC loading is performed by the GSC, via a PXP command. The load
> operation itself is relatively simple (just send a message to the GSC with the
> physical address of the HuC in LMEM), but there are timing changes that
> requires special attention. In particular, to send a PXP command we need to
> first export the GSC as an aux device and then wait for the mei-gsc and mei-
> pxp modules to start, which means that HuC load will complete after i915
> load is complete. This means that there is a small window of time after i915 is
> registered and before HuC is loaded during which userspace could submit
> and/or check the HuC load status, although this is quite unlikely to happen
> (HuC is usually loaded before kernel init/resume completes).
> We've consulted with the media team in regards to how to handle this and
> they've asked us to stall all userspace VCS submission until HuC is loaded.
> Stalls are expected to be very rare (if any), due to the fact that HuC is usually
> loaded before kernel init/resume is completed.
> 
> Timeouts are in place to ensure all submissions are unlocked in case
> something goes wrong. Since we need to monitor the status of the mei
> driver to know what's happening and when to time out, a notifier has been
> added so we get a callback when the status of the mei driver changes.
> 
> Note that this series includes several mei patches that add support for
> sending the HuC loading command via mei-gsc. We plan to merge those
> patches through the drm tree because i915 is the sole user.
> 
> v2: address review comments, Reporting HuC loading still in progress while
> we wait for mei-gsc init to complete, rebase on latest mei-gsc series.
> 
> v3: fix cc list in mei patches.
> 
> v4: update mei patches, fix includes, rebase on new FW fetch logic and
> merged mei-gsc support.
> 
> v5: update mei patches

Greg,  I hope I've addressed most of your comments.
Can you please check if the mei patches are in acceptable state or anything else can be improved with this series.  Appreciated. 
Thanks
Tomas


> 
> Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
> Cc: Tony Ye <tony.ye@intel.com>
> Cc: Alexander Usyskin <alexander.usyskin@intel.com>
> Cc: Tomas Winkler <tomas.winkler@intel.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> Daniele Ceraolo Spurio (7):
>   drm/i915/pxp: load the pxp module when we have a gsc-loaded huc
>   drm/i915/dg2: setup HuC loading via GSC
>   drm/i915/huc: track delayed HuC load with a fence
>   drm/i915/huc: stall media submission until HuC is loaded
>   drm/i915/huc: better define HuC status getparam possible return
>     values.
>   drm/i915/huc: define gsc-compatible HuC fw for DG2
>   HAX: drm/i915: force INTEL_MEI_GSC and INTEL_MEI_PXP on for CI
> 
> Tomas Winkler (5):
>   mei: add support to GSC extended header
>   mei: bus: enable sending gsc commands
>   mei: adjust extended header kdocs
>   mei: pxp: support matching with a gfx discrete card
>   drm/i915/pxp: add huc authentication and loading command
> 
> Vitaly Lubart (3):
>   mei: bus: extend bus API to support command streamer API
>   mei: pxp: add command streamer API to the PXP driver
>   drm/i915/pxp: implement function for sending tee stream command
> 
>  drivers/gpu/drm/i915/Kconfig.debug            |   2 +
>  drivers/gpu/drm/i915/Makefile                 |  11 +-
>  drivers/gpu/drm/i915/gt/intel_gsc.c           |  22 +-
>  drivers/gpu/drm/i915/gt/uc/intel_guc.c        |   1 +
>  drivers/gpu/drm/i915/gt/uc/intel_huc.c        | 254 ++++++++++++++++--
>  drivers/gpu/drm/i915/gt/uc/intel_huc.h        |  31 +++
>  drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c     |  34 +++
>  drivers/gpu/drm/i915/gt/uc/intel_huc_fw.h     |   1 +
>  drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c      |  24 +-
>  drivers/gpu/drm/i915/i915_request.c           |  24 ++
>  drivers/gpu/drm/i915/pxp/intel_pxp.c          |  32 ++-
>  drivers/gpu/drm/i915/pxp/intel_pxp.h          |  32 ---
>  drivers/gpu/drm/i915/pxp/intel_pxp_huc.c      |  69 +++++
>  drivers/gpu/drm/i915/pxp/intel_pxp_huc.h      |  13 +
>  drivers/gpu/drm/i915/pxp/intel_pxp_irq.h      |   8 +
>  drivers/gpu/drm/i915/pxp/intel_pxp_session.c  |   8 +-
>  drivers/gpu/drm/i915/pxp/intel_pxp_session.h  |  11 +-
>  drivers/gpu/drm/i915/pxp/intel_pxp_tee.c      | 138 +++++++++-
>  drivers/gpu/drm/i915/pxp/intel_pxp_tee.h      |   5 +
>  .../drm/i915/pxp/intel_pxp_tee_interface.h    |  23 +-
>  drivers/gpu/drm/i915/pxp/intel_pxp_types.h    |   6 +
>  drivers/misc/mei/bus.c                        | 146 +++++++++-
>  drivers/misc/mei/client.c                     |  55 ++--
>  drivers/misc/mei/hbm.c                        |  13 +
>  drivers/misc/mei/hw-me.c                      |   7 +-
>  drivers/misc/mei/hw.h                         |  89 +++++-
>  drivers/misc/mei/interrupt.c                  |  47 +++-
>  drivers/misc/mei/mei_dev.h                    |   8 +
>  drivers/misc/mei/pxp/mei_pxp.c                |  38 ++-
>  include/drm/i915_pxp_tee_interface.h          |   5 +
>  include/linux/mei_cl_bus.h                    |   6 +
>  include/uapi/drm/i915_drm.h                   |  16 ++
>  32 files changed, 1057 insertions(+), 122 deletions(-)  create mode 100644
> drivers/gpu/drm/i915/pxp/intel_pxp_huc.c
>  create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_huc.h
> 
> --
> 2.37.2