[PATCH v2 0/5] gpu: nova: Export parameters from nova-core to nova-drm

[Alistair Popple]

This patch series adds some basic GPU properties to the existing nova-drm
GETPARAM ioctl. It builds on top of the "drm: Higher-Ranked Lifetime
private data" series[1] to correctly manage lifetimes of registration
data shared between DRM, auxbus and nova-core. It's also based on top of
"ForLt/CovariantForLt split, auxiliary closure API and DevresLt"[2] although the
functionality of that series isn't actually required.

A tree with this series applied on top of all pre-requisites is available at
[3].

Properties are exported via a new NovaCoreApi type which implements methods to
read data from the GPU. This has been implemented in a separate module to make
the public API implementations obvious and to keep them in one place. Auxiliary
bus drivers can obtain a handle to this type using NovaCoreApi::of().

This handle can then be stored as part of the DRM registration data and used to
interact with the GPU via the nova-core driver.

Changes since v1:

 - Address review comments from Danilo
 - Add an API call to read VRAM PCI BAR size using nova-core

[1] - https://lore.kernel.org/rust-for-linux/20260628145406.2107056-1-dakr@xxxxxxxxxx/
[2] - https://lore.kernel.org/driver-core/20260626183630.2585057-1-dakr@xxxxxxxxxx/
[3] - https://github.com/apopple-nvidia/linux/tree/nova-drm

Cc: Danilo Krummrich <dakr@xxxxxxxxxx>
Cc: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Alexandre Courbot <acourbot@xxxxxxxxxx>
Cc: Benno Lossin <lossin@xxxxxxxxxx>
Cc: Gary Guo <gary@xxxxxxxxxxx>
Cc: Eliot Courtney <ecourtney@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: nova-gpu@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: rust-for-linux@xxxxxxxxxxxxxxx

Alistair Popple (5):
  gpu: nova-core: Add public driver API to nova-core
  gpu: nova: Add DRM registration data
  drm: nova: Add GETPARAM parameter to read the GPU chipset
  drm: nova: Add a GETPARAM parameter to read usable VRAM size
  drm: nova: Use nova-core to read VRAM_BAR_SIZE parameter

 drivers/gpu/drm/nova/driver.rs        | 15 +++++-
 drivers/gpu/drm/nova/file.rs          | 24 ++++-----
 drivers/gpu/nova-core/api.rs          | 49 ++++++++++++++++++
 drivers/gpu/nova-core/driver.rs       | 42 +++++++++++-----
 drivers/gpu/nova-core/gpu.rs          | 71 +++++++++++++--------------
 drivers/gpu/nova-core/gsp/commands.rs |  8 +++
 drivers/gpu/nova-core/gsp/hal.rs      |  2 +-
 drivers/gpu/nova-core/nova_core.rs    |  1 +
 include/uapi/drm/nova_drm.h           | 47 ++++++++++++++++++
 9 files changed, 197 insertions(+), 62 deletions(-)
 create mode 100644 drivers/gpu/nova-core/api.rs

-- 
2.54.0