[RFC PATCH 00/18] drm/panthor: Add Mali v15 AM virtualization support

[Karunika Choo]

This series adds initial support for Mali v15 AM GPUs and the
HW-assisted virtualization blocks around them.

The first patches make the core panthor code less dependent on fixed
register layouts by caching decoded GPU_ID fields and moving register
base offsets into the HW description. Mali v15 support is then added on
top, including 64-bit GPU_ID decoding and optional devfreq handling for
systems where frequency control is owned by AM_GOVERNOR.

The rest of the series introduces the AM_SYSTEM, AM_PARTITION_CONTROL,
AM_RESOURCE_GROUP, arbitration scheduler and access-window pieces needed
to coordinate GPU ownership between the arbiter and VM-side panthor
instances. Finally, HW component PM is routed through access windows and
waits are taught to tolerate loss of the access window.

This series has a soft dependency on firmware scheduling support that
will be added later to handle YIELD_NOW interrupts.

The resulting support is intentionally minimal, but provides the
driver-side plumbing needed for Mali v15 AM systems.

Kind regards,
Karunika Choo

Karunika Choo (18):
  drm/panthor: Ignore -EOPNOTSUPP for shader-present nvmem lookup
  drm/panthor: Move register access helpers out of panthor_device.h
  drm/panthor: Parse and store GPU_ID fields
  drm/panthor: Add 64-bit GPU_ID decoding for v15 GPUs
  drm/panthor: Move register base offsets to the HW description
  drm/panthor: Derive MMU AS register addresses from base and stride
  drm/panthor: Add Mali v15 hardware support
  drm/panthor: Skip devfreq when no OPP table is present
  drm/panthor: Add basic AM_SYSTEM support
  drm/panthor: Add AM_PARTITION_CONTROL support
  drm/panthor: Add AM message helpers
  drm/panthor: Add AM_RESOURCE_GROUP support
  drm/panthor: Add arbitration scheduler
  drm/panthor: Route arbitration events
  drm/panthor: Add access-window support
  drm/panthor: Synchronize HW component PM transitions
  drm/panthor: Route HW component PM through access windows
  drm/panthor: Tolerate access-window loss during HW waits

 drivers/gpu/drm/panthor/Kconfig               |  14 +
 drivers/gpu/drm/panthor/Makefile              |   3 +
 drivers/gpu/drm/panthor/arbitration/Makefile  |  17 +
 .../panthor/arbitration/panthor_arbitration.h |  45 ++
 .../arbitration/panthor_arbitration_drv.c     | 199 +++++
 .../arbitration/panthor_arbitration_sched.c   | 692 ++++++++++++++++++
 .../arbitration/panthor_arbitration_sched.h   |  25 +
 .../arbitration/panthor_partition_control.c   | 390 ++++++++++
 .../arbitration/panthor_partition_control.h   |  27 +
 .../arbitration/panthor_resource_group.c      | 288 ++++++++
 .../arbitration/panthor_resource_group.h      |  20 +
 drivers/gpu/drm/panthor/panthor_am_msg.h      | 157 ++++
 drivers/gpu/drm/panthor/panthor_aw.c          | 576 +++++++++++++++
 drivers/gpu/drm/panthor/panthor_aw.h          |  46 ++
 drivers/gpu/drm/panthor/panthor_devfreq.c     |  13 +-
 drivers/gpu/drm/panthor/panthor_device.c      |  69 +-
 drivers/gpu/drm/panthor/panthor_device.h      | 134 ++--
 drivers/gpu/drm/panthor/panthor_device_io.h   |  81 ++
 drivers/gpu/drm/panthor/panthor_drv.c         |   1 +
 drivers/gpu/drm/panthor/panthor_fw.c          |   8 +-
 drivers/gpu/drm/panthor/panthor_fw_regs.h     |   2 -
 drivers/gpu/drm/panthor/panthor_gpu.c         |  14 +-
 .../drm/panthor/panthor_gpu_discover_regs.h   |  42 ++
 drivers/gpu/drm/panthor/panthor_gpu_regs.h    |   2 -
 drivers/gpu/drm/panthor/panthor_heap.c        |   3 +-
 drivers/gpu/drm/panthor/panthor_hw.c          | 163 ++++-
 drivers/gpu/drm/panthor/panthor_hw.h          |  45 +-
 drivers/gpu/drm/panthor/panthor_mmu.c         |  36 +-
 drivers/gpu/drm/panthor/panthor_mmu_regs.h    |  23 +-
 drivers/gpu/drm/panthor/panthor_pwr.c         |  32 +-
 drivers/gpu/drm/panthor/panthor_pwr_regs.h    |   3 -
 drivers/gpu/drm/panthor/panthor_sched.c       |   9 +-
 drivers/gpu/drm/panthor/system/Makefile       |  12 +
 .../gpu/drm/panthor/system/panthor_system.c   | 298 ++++++++
 include/uapi/drm/panthor_drm.h                |  20 +-
 35 files changed, 3338 insertions(+), 171 deletions(-)
 create mode 100644 drivers/gpu/drm/panthor/arbitration/Makefile
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_arbitration.h
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_arbitration_drv.c
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_arbitration_sched.c
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_arbitration_sched.h
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_partition_control.c
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_partition_control.h
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_resource_group.c
 create mode 100644 drivers/gpu/drm/panthor/arbitration/panthor_resource_group.h
 create mode 100644 drivers/gpu/drm/panthor/panthor_am_msg.h
 create mode 100644 drivers/gpu/drm/panthor/panthor_aw.c
 create mode 100644 drivers/gpu/drm/panthor/panthor_aw.h
 create mode 100644 drivers/gpu/drm/panthor/panthor_device_io.h
 create mode 100644 drivers/gpu/drm/panthor/panthor_gpu_discover_regs.h
 create mode 100644 drivers/gpu/drm/panthor/system/Makefile
 create mode 100644 drivers/gpu/drm/panthor/system/panthor_system.c

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2.43.0