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dmarc=pass action=none header.from=garyguo.net;\n dkim=pass header.d=garyguo.net; arc=none"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=garyguo.net;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=lCfV2+t++hO2k8Fn1VZHy6caeMFxqr4HNYPKk7oJ1Ak=;\n b=ifqdLYA25e5BOHiIzCFeTQKbPSqgJGMInsU4qRqxGD0ofUsUxQYu6cWKzamoBNOi69OqGEYO16J20dkiDbOLe1Qf/DcZm7uN1lmRKcTahKvfoeTZFlB4+JpQEKxhwUaDTzaNY975Nwdc/iUPbVlJGBvssa3nVcULUKU4qcU9Iak=","From":"Gary Guo ","Subject":"[PATCH v2 00/11] rust: I/O type generalization and projection","Date":"Tue, 21 Apr 2026 15:56:11 +0100","Message-Id":"<20260421-io_projection-v2-0-4c251c692ef4@garyguo.net>","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","X-B4-Tracking":"v=1; b=H4sIAAuQ52kC/02O7w6CIBRHX8XxubsBiS5fpbkGeCtqggGazfnu4\n Z+tPv62c8+5EwnoDQZSZRPxOJhgnE2DHzKi79LeEEyTNuGUFzTnDIy7dN49UMdEAiuwbLRQssS\n cpJvO49WMq+9cbzv0aqEXyU54fPUpFDfs10nZtcIE/CXCx0Y5gse3809Q5YnKIxVKC14NbDEqG\n RC0a1sTq8ziGGF/lpJ6nr/IBvSO4gAAAA==","X-Change-ID":"20260421-io_projection-16e7dc5ba7e4","To":"Greg Kroah-Hartman ,\n \"Rafael J. Wysocki\" , Danilo Krummrich ,\n Miguel Ojeda , Boqun Feng ,\n Gary Guo ,\n =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= ,\n Benno Lossin , Andreas Hindborg ,\n Alice Ryhl , Trevor Gross ,\n Daniel Almeida ,\n Bjorn Helgaas ,\n =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= ,\n Abdiel Janulgue ,\n Robin Murphy ,\n Alexandre Courbot , David Airlie ,\n Simona Vetter ","Cc":"driver-core@lists.linux.dev, rust-for-linux@vger.kernel.org,\n linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,\n nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org","X-Mailer":"b4 0.15.1","X-Developer-Signature":"v=1; a=ed25519-sha256; t=1776783386; l=4249;\n i=gary@garyguo.net; s=20221204; h=from:subject:message-id;\n bh=Sx5ASB/s1JTnFW22MELsFVBJd+afu94iWVkqh0/qKrM=;\n b=+bzmrS9xdeeVnlweBLz6DjizV9+0yqELImt2Wk5nGlB/UwGdGcTI5ZmsCSVCDI0H41z9VpaGl\n f/2DvECszc6Do+dFcTeCio+PotO4ReIoQAXeR0Xfu8SdjXkbZsR9kD7","X-Developer-Key":"i=gary@garyguo.net; a=ed25519;\n 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b05d3aa6-a5bc-4484-ef93-08de9fb629e6","X-MS-Exchange-CrossTenant-AuthSource":"LOVP265MB8871.GBRP265.PROD.OUTLOOK.COM","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"21 Apr 2026 14:56:27.0207\n (UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"bbc898ad-b10f-4e10-8552-d9377b823d45","X-MS-Exchange-CrossTenant-MailboxType":"HOSTED","X-MS-Exchange-CrossTenant-UserPrincipalName":"\n OQ3EEvFMth9NOwTativDAe2vIwjgxZWOXiknG7oFoHTzU7E7YdRya7j4CWwfi/x4yTNA6JcfAz9rfFpy7Tw5iQ==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"CWXP265MB3558"},"content":"This series generalize `Mmio`/`MmioRaw` type from just an untyped region\nto typed representations (so `MmioRaw` is `__iomem *T`). This allows\nus to remove the `IoKnownSize` trait; the information is sourced from\njust the pointer from the `KnownSize` trait instead.\n\nThis enables us to implement `Io` trait for `Coherent`, enabling\nunified handling of MMIO and DMA coherent memory. It also paves the way\nto uniformly support shared system memory, which Tyr will likely need\n[1].\n\nBuilt on this generalization, this series also add a `io::View` type\nwhich represents a subview of a bigger I/O region, and a `io_project!()`\nmacro that provides a safe way to perform this. Some Nova code has been\nconverted in this series to demonstrate cleanups possible with this\naddition.\n\nNew `io_read!()`, `io_write!()` has been added that supersedes\n`dma_read!()`, `dma_write!()` macro. Although, they work for primitives\nonly (to be exact, types that the backend is `IoCapable` of).\nOne feature that was lost from the old `dma_read!()` and `dma_write!()`\nseries was the ability to read/write a large structs. However, the\nsemantics was unclear to begin with, as there was no guarantee about their\natomicity even for structs that were small enough to fit in u32.\n\nIn this series, I've introduced a new patch that re-introduces the\ncapability in the form of copying methods.\n\n dma_read!(foo, bar) -> io_project!(foo, bar).copy_read()\n dma_write!(foo, bar, baz) -> io_project!(foo, bar).copy_write(baz)\n\nThe semantics for these are modelled after memcpy so it has clear\nsemantics. This also makes it work for MMIO, which maps to\n`memcpy_{from,to}io`.\n\nThis series depend on the projection syntax rework series [2].\n\nLink: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Generic.20I.2FO.20backends/near/572377073 [1]\nLink: https://lore.kernel.org/rust-for-linux/20260415-projection-syntax-rework-v1-0-450723cb3727@garyguo.net/ [2]\n\nChanges since v1:\n- Rebased on projection syntax rework\n- Added a new patch to forbid use of untyped I/O accessors and register\n macros on typed I/O structs (Alex).\n- Fixed a few safety comments (Andreas).\n- Added a new patch that implements copying methods (see above).\n- Link to v1: https://lore.kernel.org/rust-for-linux/20260323153807.1360705-1-gary@kernel.org/\n\n---\nGary Guo (11):\n rust: io: generalize `MmioRaw` to pointer to arbitrary type\n rust: io: generalize `Mmio` to arbitrary type\n rust: io: use pointer types instead of address\n rust: io: add missing safety requirement in `IoCapable` methods\n rust: io: restrict untyped IO access and `register!` to `Region`\n rust: io: add view type\n rust: dma: add methods to unsafely create reference from subview\n rust: io: add `read_val` and `write_val` function on I/O view\n gpu: nova-core: use I/O projection for cleaner encapsulation\n rust: dma: drop `dma_read!` and `dma_write!` API\n rust: io: add copying methods\n\n drivers/gpu/nova-core/gsp.rs | 44 ++-\n drivers/gpu/nova-core/gsp/cmdq.rs | 65 ++--\n drivers/gpu/nova-core/gsp/fw.rs | 84 ++---\n rust/kernel/devres.rs | 11 +-\n rust/kernel/dma.rs | 232 ++++++------\n rust/kernel/io.rs | 769 ++++++++++++++++++++++++++++++++------\n rust/kernel/io/mem.rs | 10 +-\n rust/kernel/io/poll.rs | 6 +-\n rust/kernel/io/register.rs | 40 +-\n rust/kernel/pci/io.rs | 80 ++--\n rust/kernel/ptr.rs | 7 +\n samples/rust/rust_dma.rs | 14 +-\n 12 files changed, 948 insertions(+), 414 deletions(-)\n---\nbase-commit: 77a9bb0193d790fb71c0edfc567bddc1b56fb3ff\nchange-id: 20260421-io_projection-16e7dc5ba7e4\nprerequisite-change-id: 20260415-projection-syntax-rework-b790a305bc52:v1\nprerequisite-patch-id: 110c29f61d0e7259d64057b6f364587c5ee501f5\nprerequisite-patch-id: c157387d475fa22e32fc87d831a1ec384d256ca4\nprerequisite-patch-id: 4109733485cae727763b2cd9ece69742e3d17cbf\nprerequisite-patch-id: 5b686696f7dada42bb0768d255699dda0252234b\nprerequisite-patch-id: a736703c95dc35a23e8c52bbdcba0ca9f38b55fb\n\nBest regards,\n-- \nGary Guo "}