[PATCH v3 0/8] drm/tyr: add debugfs support

[Alvin Sun <alvin.sun@linux.dev>]

Add debugfs support for the Tyr DRM driver.

The series adds a SeqShow trait for seq_file-backed debugfs files, a
debugfs_init callback on the DRM Driver trait, and a gpuvas debugfs
file in Tyr exposing GPU VA space information.

This is based on drm-rust-next and depends on:

[PATCH v10 0/7] drm/tyr: firmware loading and MCU boot support
  https://lore.kernel.org/r/20260728-fw-boot-b4-v10-0-9187aefa3f2f@collabora.com

See the full dependency and commit history at [1].

Link: https://gitlab.freedesktop.org/panfrost/linux/-/issues/11
Link: https://gitlab.freedesktop.org/panfrost/linux/-/merge_requests/59 [1]
Signed-off-by: Alvin Sun <alvin.sun@linux.dev>
---
Changes in v3:
- Drop the DrmSeqShow adapter and use SeqShow directly, per Danilo's
  feedback. Simplify the debugfs_init callback signature accordingly.
- Redesign VmRegistry per Daniel's and Alice's feedback: move it to
  vm.rs at the top level of the registration data, use Arc<VmRegistry>
  for shared ownership, and separate register/unregister from Vm::new
  and Vm::kill. Registration failure is non-fatal (dev_warn) since the
  registry is a debugfs convenience.
- Add VmRegistry::unregister to remove VMs on teardown, addressing
  Alice's concern about the list going out of sync.
- Drop the "hold device reference for open files" patch; the debugfs
  proxy fops already ensure file operations cannot outlive
  debugfs_remove().
- Improve SAFETY comments and fix style issues identified during review.
- Link to v2: https://lore.kernel.org/r/20260731-tyr-debugfs-v2-v2-0-aea19eccb996@linux.dev

Changes in v2:
- Reworked the debugfs implementation per feedback from Danilo on v1:
  dropped the hazptr/revocable-based approach in favor of the DRM
  debugfs_init callback and generic seq_file abstractions.
- Fixed a UAF in drm_debugfs where a device could be unregistered while
  a debugfs file remains open (drm_dev_get/put across file lifetime).
- Link to v1: https://lore.kernel.org/r/20260326-b4-tyr-debugfs-v1-0-074badd18716@linux.dev

---
Alvin Sun (8):
      rust: seq_file: add as_raw() method
      rust: debugfs: add seq_file support
      rust: debugfs: add ScopeRef for existing dentries
      drm: move debugfs_init after dev->registered is set
      rust: drm: add debugfs_init callback to Driver trait
      rust: drm: gpuvm: add dump_gpuva_info to UniqueRefGpuVm
      drm/tyr: track VMs in a registry
      drm/tyr: add gpuvas debugfs file

 drivers/gpu/drm/drm_debugfs.c   |  3 --
 drivers/gpu/drm/drm_drv.c       |  5 +++
 drivers/gpu/drm/tyr/debugfs.rs  | 20 ++++++++++
 drivers/gpu/drm/tyr/driver.rs   | 16 +++++++-
 drivers/gpu/drm/tyr/fw.rs       | 18 +++++++--
 drivers/gpu/drm/tyr/tyr.rs      |  1 +
 drivers/gpu/drm/tyr/vm.rs       | 33 ++++++++++++++++
 rust/bindings/bindings_helper.h |  1 +
 rust/kernel/debugfs.rs          | 84 ++++++++++++++++++++++++++++++++++++++++-
 rust/kernel/debugfs/entry.rs    | 15 +++++++-
 rust/kernel/debugfs/file_ops.rs | 60 +++++++++++++++++++++++++++++
 rust/kernel/debugfs/traits.rs   | 11 ++++++
 rust/kernel/drm/device.rs       | 41 +++++++++++++++++++-
 rust/kernel/drm/driver.rs       | 11 ++++++
 rust/kernel/drm/gpuvm/mod.rs    |  9 +++++
 rust/kernel/seq_file.rs         |  6 +++
 16 files changed, 323 insertions(+), 11 deletions(-)
---
base-commit: 0ffc014cb2abfc79d161662b125e085b3e7107e7
change-id: 20260730-tyr-debugfs-v2-608cef77d6e9

Best regards,
-- 
Alvin Sun <alvin.sun@linux.dev>