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| author | Catalin Marinas <catalin.marinas@arm.com> | 2015-02-05 19:01:53 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-02-27 19:05:55 +0100 |
| commit | a1e50a82256ed2f1312e70c52a84323e2e378f49 (patch) | |
| tree | d1a3059412f8323c6644f2fceb7649cba84a093c /arch/arm64/include | |
| parent | arm64: Fix text patching logic when using fixmap (diff) | |
| download | linux-a1e50a82256ed2f1312e70c52a84323e2e378f49.tar.xz linux-a1e50a82256ed2f1312e70c52a84323e2e378f49.zip | |
arm64: Increase the swiotlb buffer size 64MB
With commit 3690951fc6d4 (arm64: Use swiotlb late initialisation), the
swiotlb buffer size is limited to MAX_ORDER_NR_PAGES. However, there are
platforms with 32-bit only devices that require bounce buffering via
swiotlb. This patch changes the swiotlb initialisation to an early 64MB
memblock allocation. In order to get the swiotlb buffer correctly
allocated (via memblock_virt_alloc_low_nopanic), this patch also defines
ARCH_LOW_ADDRESS_LIMIT to the maximum physical address capable of 32-bit
DMA.
Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/processor.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index f9be30ea1cbd..20e9591a60cf 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -45,7 +45,8 @@ #define STACK_TOP STACK_TOP_MAX #endif /* CONFIG_COMPAT */ -#define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK +extern phys_addr_t arm64_dma_phys_limit; +#define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1) #endif /* __KERNEL__ */ struct debug_info { |