[PATCH v8 0/3] drm/tyr: GPU reset infrastructure

["Onur Özkan" <work@onurozkan.dev>]

Add support for scheduling GPU resets on a dedicated workqueue. Track
the reset state to avoid queueing another reset while one is already
pending or in progress.

Use an SRCU based gate with mutex-protected reader admission to block
hardware accesses while reset work runs and wait for current users
before resetting.

Stop new reset requests during teardown and drain any queued or running
reset work before releasing the device resources.

This is the initial reset infrastructure only. It is not wired to a reset
source yet as those will follow in separate work.

This version is based on drm-rust-next commit
cc0e99fad239 ("gpu: nova-core: add support for GPU timer block. (v7)"),
with v3 of "workqueue: OwnedQueue and ScopedWork" [1].

Changes since v7:
  - Rebase against drm-rust-next and workqueue v3.
  - Add a TODO to consider embedding HwGate in platform data.

V7: https://lore.kernel.org/all/20260912-tyr-reset-impl-v7-0-077ce72084eb@onurozkan.dev/
Link: https://lore.kernel.org/all/20261020-rust-workqueue-v3-0-ea7c74d02068@google.com/ [1]
Link: https://gitlab.freedesktop.org/panfrost/linux/-/issues/28
Signed-off-by: Onur Özkan <work@onurozkan.dev>
---
Onur Özkan (3):
      drm/tyr: clear stale IRQ state before soft reset
      drm/tyr: add GPU reset infrastructure
      drm/tyr: put iomem behind the hardware gate

 drivers/gpu/drm/tyr/driver.rs            |  63 ++++----
 drivers/gpu/drm/tyr/fw.rs                |  16 +-
 drivers/gpu/drm/tyr/mmu.rs               |   6 +-
 drivers/gpu/drm/tyr/mmu/address_space.rs |  87 ++++++-----
 drivers/gpu/drm/tyr/reset.rs             | 244 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/tyr/reset/hw_gate.rs     | 106 ++++++++++++++
 drivers/gpu/drm/tyr/tyr.rs               |   1 +
 7 files changed, 441 insertions(+), 82 deletions(-)
---
base-commit: cc0e99fad2392ac479e2594b88fd947a2f2d9c33
change-id: 20260813-tyr-reset-impl-93e951f996b4
prerequisite-change-id: 20261012-rust-workqueue-658cd0fbe770:v3
prerequisite-patch-id: f5e24f7b3717f2ab0445b5395c7f12b554861d78
prerequisite-patch-id: 0bf6ae4abcef7090d0e48921d6ec627a59dc6a7a
prerequisite-patch-id: e19d2e11fc6c6fc121d65c8502bfa557e1dfc5ec
prerequisite-patch-id: 89eb57a43e71850c447ea7cb7051fb36066ca329