From d8932355f8c5673106eca49abd142f8fe0c1fe8b Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Fri, 5 Dec 2025 01:06:39 +0900 Subject: [PATCH] rust: dma: add helpers for architectures without CONFIG_HAS_DMA Add dma_set_mask(), dma_set_coherent_mask(), dma_map_sgtable(), and dma_max_mapping_size() helpers to fix a build error when CONFIG_HAS_DMA is not enabled. Note that when CONFIG_HAS_DMA is enabled, they are included in both bindings_generated.rs and bindings_helpers_generated.rs. The former takes precedence so behavior remains unchanged in that case. This fixes the following build error on UML: error[E0425]: cannot find function `dma_set_mask` in crate `bindings` --> rust/kernel/dma.rs:46:38 | 46 | to_result(unsafe { bindings::dma_set_mask(self.as_ref().as_raw(), mask.value()) }) | ^^^^^^^^^^^^ help: a function with a similar name exists: `xa_set_mark` | ::: rust/bindings/bindings_generated.rs:24690:5 | 24690 | pub fn xa_set_mark(arg1: *mut xarray, index: ffi::c_ulong, arg2: xa_mark_t); | ---------------------------------------------------------------------------- similarly named function `xa_set_mark` defined here error[E0425]: cannot find function `dma_set_coherent_mask` in crate `bindings` --> rust/kernel/dma.rs:63:38 | 63 | to_result(unsafe { bindings::dma_set_coherent_mask(self.as_ref().as_raw(), mask.value()) }) | ^^^^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `dma_coherent_ok` | ::: rust/bindings/bindings_generated.rs:52745:5 | 52745 | pub fn dma_coherent_ok(dev: *mut device, phys: phys_addr_t, size: usize) -> bool_; | ---------------------------------------------------------------------------------- similarly named function `dma_coherent_ok` defined here error[E0425]: cannot find function `dma_map_sgtable` in crate `bindings` --> rust/kernel/scatterlist.rs:212:23 | 212 | bindings::dma_map_sgtable(dev.as_raw(), sgt.as_ptr(), dir.into(), 0) | ^^^^^^^^^^^^^^^ help: a function with a similar name exists: `dma_unmap_sgtable` | ::: rust/bindings/bindings_helpers_generated.rs:1351:5 | 1351 | / pub fn dma_unmap_sgtable( 1352 | | dev: *mut device, 1353 | | sgt: *mut sg_table, 1354 | | dir: dma_data_direction, 1355 | | attrs: ffi::c_ulong, 1356 | | ); | |______- similarly named function `dma_unmap_sgtable` defined here error[E0425]: cannot find function `dma_max_mapping_size` in crate `bindings` --> rust/kernel/scatterlist.rs:356:52 | 356 | let max_segment = match unsafe { bindings::dma_max_mapping_size(dev.as_raw()) } { | ^^^^^^^^^^^^^^^^^^^^ not found in `bindings` error: aborting due to 4 previous errors Cc: stable@vger.kernel.org # v6.17+ Fixes: 101d66828a4ee ("rust: dma: add DMA addressing capabilities") Signed-off-by: FUJITA Tomonori Reviewed-by: David Gow Reviewed-by: Alice Ryhl Link: https://patch.msgid.link/20251204160639.364936-1-fujita.tomonori@gmail.com [ Use relative paths in the error splat; add 'dma' prefix. - Danilo ] Signed-off-by: Danilo Krummrich --- rust/helpers/dma.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/rust/helpers/dma.c b/rust/helpers/dma.c index 6e741c197242..2afa32c21c94 100644 --- a/rust/helpers/dma.c +++ b/rust/helpers/dma.c @@ -19,3 +19,24 @@ int rust_helper_dma_set_mask_and_coherent(struct device *dev, u64 mask) { return dma_set_mask_and_coherent(dev, mask); } + +int rust_helper_dma_set_mask(struct device *dev, u64 mask) +{ + return dma_set_mask(dev, mask); +} + +int rust_helper_dma_set_coherent_mask(struct device *dev, u64 mask) +{ + return dma_set_coherent_mask(dev, mask); +} + +int rust_helper_dma_map_sgtable(struct device *dev, struct sg_table *sgt, + enum dma_data_direction dir, unsigned long attrs) +{ + return dma_map_sgtable(dev, sgt, dir, attrs); +} + +size_t rust_helper_dma_max_mapping_size(struct device *dev) +{ + return dma_max_mapping_size(dev); +}