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

[Joel Fernandes <joelagnelf@nvidia.com>]

On 3/25/2026 8:13 AM, Eliot Courtney wrote:
> 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>

For all except patch #2,

Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>

For patch #2, I have the same concerns as John mentioned.

Thanks.


> ---
> 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>
>