gpu: nova-core: replace `Duration` with `Delta`

The kernel's `Delta` type was not available when the `wait_on` function
was introduced. Now that it is, switch to it as it is more compact than
`Durat

gpu: nova-core: replace `Duration` with `Delta`

The kernel's `Delta` type was not available when the `wait_on` function
was introduced. Now that it is, switch to it as it is more compact than
`Duration` and cannot panic.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250624-nova-delta-v1-1-b37d75a593ac@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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gpu: nova-core: consider `clippy::cast_lossless`

Fix all warnings caused by `clippy::cast_lossless`, which is going to be
enabled by [1].

Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Miguel Ojed

gpu: nova-core: consider `clippy::cast_lossless`

Fix all warnings caused by `clippy::cast_lossless`, which is going to be
enabled by [1].

Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Link: https://lore.kernel.org/r/20250615-ptr-as-ptr-v12-5-f43b024581e8@gmail.com [1]
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250624132337.2242-2-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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gpu: nova-core: update and annotate TODO list

A few new dependencies are required to remove some of the TODO items:

- A way to safely convert from byte slices to types implementing
`FromBytes`,
-

gpu: nova-core: update and annotate TODO list

A few new dependencies are required to remove some of the TODO items:

- A way to safely convert from byte slices to types implementing
`FromBytes`,
- A way to obtain slices and write into a `CoherentAllocation`,
- Several improvements to the `register!()` macro,
- Alignment operations to powers of two, and an equivalent to the C
`fls`,
- Support for `xa_alloc` in the XAlloc bindings.

Some items have also become obsolete:

- The auxiliary bus abstractions have been implemented and are in use,
- The ELF utilities are not considered for being part of the core kernel
bindings anymore.
- VBIOS, falcon and GPU timer have been completed.

We now have quite a few TODO entries in the code, so annotate them with
a 4 letter code representing the corresponding task in `todo.rst`. This
allows to easily find which part of the code corresponds to a given
entry (and conversely).

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250619-nova-frts-v6-24-ecf41ef99252@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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gpu: nova-core: add falcon register definitions and base code

Booting the GSP on Ampere requires an intricate dance between the GSP
and SEC2 falcons, where the GSP starts by running the FWSEC firmwa

gpu: nova-core: add falcon register definitions and base code

Booting the GSP on Ampere requires an intricate dance between the GSP
and SEC2 falcons, where the GSP starts by running the FWSEC firmware to
create the WPR2 region , and then SEC2 loads the actual RISC-V firmware
into the GSP.

Add the common Falcon code and HAL for Ampere GPUs, and instantiate the
GSP and SEC2 Falcons that will be required to perform that dance and
boot the GSP.

Thanks to Ben Skeggs for pointing out an important bug in the memory
scrubbing code that could lead to a race condition and ultimately a
failure to boot the GSP!

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://lore.kernel.org/r/20250619-nova-frts-v6-15-ecf41ef99252@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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