[PATCH 0/8] I/O type generalization and projection

[Gary Guo <gary@kernel.org>]

From: Gary Guo <gary@garyguo.net>

This series generalize `Mmio`/`MmioRaw` type from just an untyped region
to typed representations (so `MmioRaw<T>` is `__iomem *T`). This allows
us to remove the `IoKnownSize` trait; the information is sourced from
just the pointer from the `KnownSize` trait instead.

This enables us to implement `Io` trait for `Coherent<T>`, enabling
unified handling of MMIO and DMA coherent memory. It also paves the way
to uniformly support shared system memory, which Tyr will likely need
[1].

Built on this generalization, this series also add a `io::View` type
which represents a subview of a bigger I/O region, and a `io_project!()`
macro that provides a safe way to perform this. Some Nova code has been
converted in this series to demonstrate cleanups possible with this
addition.

This series depend on the Coherent API rework series [2].

Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Generic.20I.2FO.20backends/near/572377073 [1]
Link: https://lore.kernel.org/rust-for-linux/DH87CCNRR5EC.2SK3IT6N6Q8V5@nvidia.com/ [2]

Gary Guo (8):
  rust: io: generalize `MmioRaw` to pointer to arbitrary type
  rust: io: generalize `Mmio` to arbitrary type
  rust: io: use pointer types instead of address
  rust: io: add view type
  rust: dma: add methods to unsafely create reference from subview
  rust: io: add `read_val` and `write_val` function on I/O view
  gpu: nova-core: use I/O projection for cleaner encapsulation
  rust: dma: drop `dma_read!` and `dma_write!` API

 drivers/gpu/nova-core/gsp.rs      |  42 ++-
 drivers/gpu/nova-core/gsp/cmdq.rs |  69 +++--
 drivers/gpu/nova-core/gsp/fw.rs   |  84 ++---
 rust/kernel/devres.rs             |  11 +-
 rust/kernel/dma.rs                | 217 ++++++-------
 rust/kernel/io.rs                 | 498 +++++++++++++++++++++++-------
 rust/kernel/io/mem.rs             |  10 +-
 rust/kernel/io/poll.rs            |   6 +-
 rust/kernel/io/register.rs        |  19 +-
 rust/kernel/pci/io.rs             |  88 ++++--
 rust/kernel/ptr.rs                |   7 +
 samples/rust/rust_dma.rs          |  21 +-
 12 files changed, 681 insertions(+), 391 deletions(-)


base-commit: 785f0eb2f85decbe7c1ef9ae922931f0194ffc2e
prerequisite-patch-id: 07a5643b01ce7f63ca42f1a322dcbdb5fc7fa9c2
prerequisite-patch-id: abae47bddac0d45e32dd54ce2f935b0675a6ebdf
prerequisite-patch-id: 7779e87914e4be91f0ced6760299ddf603943baf
prerequisite-patch-id: 31c43ae681611b92f24cbd369fac5af5834dd80f
prerequisite-patch-id: 60d56698d6bf30f31bed11375d5dc7eaeb359a0f
prerequisite-patch-id: 013e064c8c9dc0b7b0ff558ef0d9d6e674c629ee
prerequisite-patch-id: 5c5792a0435bdbdfd2aeb8a3d2dac79aa9ae7d6b
prerequisite-patch-id: 1e8d93ee75c56eecac13859c4024ea13f3cc872c
prerequisite-patch-id: b3a3589264ec10a5c33d4cea3ce69e9c6845d3dc
-- 
2.51.2