[PATCH v3 13/13] dma: arm64: Add CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC and enable it for arm64
Catalin Marinas
catalin.marinas at arm.com
Sun Nov 6 14:01:43 PST 2022
With all the infrastructure in place for bouncing small kmalloc()
buffers, add the corresponding Kconfig entry and select it for arm64.
Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Christoph Hellwig <hch at lst.de>
Cc: Robin Murphy <robin.murphy at arm.com>
---
arch/arm64/Kconfig | 1 +
kernel/dma/Kconfig | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3991cb7b8a33..f889cf16e6ab 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -100,6 +100,7 @@ config ARM64
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
+ select ARCH_WANT_KMALLOC_DMA_BOUNCE
select ARCH_WANT_LD_ORPHAN_WARN
select ARCH_WANTS_NO_INSTR
select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index d6fab8e3cbae..b56e76371023 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -86,6 +86,14 @@ config SWIOTLB
bool
select NEED_DMA_MAP_STATE
+config ARCH_WANT_KMALLOC_DMA_BOUNCE
+ bool
+
+config DMA_BOUNCE_UNALIGNED_KMALLOC
+ def_bool y
+ depends on ARCH_WANT_KMALLOC_DMA_BOUNCE
+ depends on SWIOTLB && !SLOB
+
config DMA_RESTRICTED_POOL
bool "DMA Restricted Pool"
depends on OF && OF_RESERVED_MEM && SWIOTLB
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