[PATCH v3 0/9] gpu: nova-core: gsp: add RM control command infrastructure

Eliot Courtney
2026-03-25T12:14:02Z

Add the infrastructure for sending RM control RPCs. This is needed e.g.
for channel allocation.

This series adds:
- `NV_STATUS` bindings and wrapping `NvStatus` enum (used by RM control
RPCs)
- The necessary bindings for the RM control RPCs.
- `RmControlMsgFunction` to identify individual control commands, like
`MsgFunction` for GSP commands.
- `SBufferIter::read_to_vec` (using KVVec) for reading large RPC payloads
- A typed `RmControl` command that can send RM control commands.
- One usage of `RmControl`: the `FaultMethodBufferSize`
RPC. This is useful for channel allocation later.

Each new RM control command can be added by extending
`RmControlMsgFunction`, adding the bindings and wrappers for their
parameters, and writing a type-safe wrapper to send and receive the
reply for the RM control rpc, using `RmControl`.

This series applies on latest drm-rust-next with the listed
pre-requisites.

Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
---
Changes in v3:
- Remove `send_rm_control` in favour of a typed `RmControl`
- Print out fault method buffer size at gsp boot
- Remove Reviewed-by and Tested-by on some patches that have changed
substantively.
- Link to v2: https://lore.kernel.org/r/20260318-rmcontrol-v2-0-9a9fa6f1c4c3@nvidia.com

Changes in v2:
- Introduce typed Handle<T> for RM objects.
- Improve naming
- Improve doc comments
- Change SBufferIter to always use KVVec
- flush_into_kvec -> read_to_vec
- Rebased on latest cmdq locking
- Link to v1: https://lore.kernel.org/r/20260227-rmcontrol-v1-0-86648e4869f9@nvidia.com

---
Eliot Courtney (9):
gpu: nova-core: gsp: add NV_STATUS error code bindings
gpu: nova-core: gsp: add NvStatus enum for RM control errors
gpu: nova-core: gsp: expose GSP-RM internal client and subdevice handles
gpu: nova-core: gsp: add RM control RPC structure binding
gpu: nova-core: gsp: add types for RM control RPCs
gpu: nova-core: use KVVec for SBufferIter flush
gpu: nova-core: gsp: add RM control command infrastructure
gpu: nova-core: gsp: add CE fault method buffer size bindings
gpu: nova-core: gsp: add FaultMethodBufferSize RM control command

drivers/gpu/nova-core/gsp.rs | 1 +
drivers/gpu/nova-core/gsp/boot.rs | 11 +
drivers/gpu/nova-core/gsp/commands.rs | 62 ++++
drivers/gpu/nova-core/gsp/fw.rs | 402 ++++++++++++++++++++++
drivers/gpu/nova-core/gsp/fw/commands.rs | 19 +-
drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs | 161 +++++++++
drivers/gpu/nova-core/gsp/fw/rm.rs | 106 ++++++
drivers/gpu/nova-core/gsp/rm.rs | 3 +
drivers/gpu/nova-core/gsp/rm/commands.rs | 167 +++++++++
drivers/gpu/nova-core/gsp/sequencer.rs | 4 +-
drivers/gpu/nova-core/sbuffer.rs | 6 +-
11 files changed, 936 insertions(+), 6 deletions(-)
---
base-commit: dff8302ca1d0e773c90dbeeb05e759f995c95482
change-id: 20260225-rmcontrol-bd8a06fc3a0d

Best regards,
--
Eliot Courtney <ecourtney@nvidia.com>