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| author | Gaurav Batra <gbatra@linux.ibm.com> | 2025-11-07 19:11:05 +0300 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2026-01-07 07:03:55 +0300 |
| commit | 1471c517cf7dae1a6342fb821d8ed501af956dd0 (patch) | |
| tree | 8adae503ae559b9eb3fe6e6f5ffd86854621fe24 /include | |
| parent | 20ab1d11265350a9ea3d315d6c70170b8198f329 (diff) | |
| download | linux-1471c517cf7dae1a6342fb821d8ed501af956dd0.tar.xz | |
powerpc/iommu: bypass DMA APIs for coherent allocations for pre-mapped memory
Leverage ARCH_HAS_DMA_MAP_DIRECT config option for coherent allocations as
well. This will bypass DMA ops for memory allocations that have been
pre-mapped.
Always set device bus_dma_limit when memory is pre-mapped. In some
architectures, like PowerPC, pmemory can be converted to regular memory via
daxctl command. This will gate the coherent allocations to pre-mapped RAM
only, by dma_coherent_ok().
Signed-off-by: Gaurav Batra <gbatra@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20251107161105.85999-1-gbatra@linux.ibm.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-map-ops.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 4809204c674c..8eff2f53fd86 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -395,11 +395,15 @@ bool arch_dma_map_sg_direct(struct device *dev, struct scatterlist *sg, int nents); bool arch_dma_unmap_sg_direct(struct device *dev, struct scatterlist *sg, int nents); +bool arch_dma_alloc_direct(struct device *dev); +bool arch_dma_free_direct(struct device *dev, dma_addr_t dma_handle); #else #define arch_dma_map_phys_direct(d, a) (false) #define arch_dma_unmap_phys_direct(d, a) (false) #define arch_dma_map_sg_direct(d, s, n) (false) #define arch_dma_unmap_sg_direct(d, s, n) (false) +#define arch_dma_alloc_direct(d) (false) +#define arch_dma_free_direct(d, a) (false) #endif #ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS |