xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dma-mapping: add a dma_alloc_need_uncached helper

Browse Source 
Check if we need to allocate uncached memory for a device given the
allocation flags.  Switch over the uncached segment check to this helper
to deal with architectures that do not support the dma_cache_sync
operation and thus should not returned cacheable memory for
DMA_ATTR_NON_CONSISTENT allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
2019-06-14 16:06:10 +02:00
parent 961729bfc7
commit 4b85faed21
2 changed files with 16 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/dma/direct.c
View File

@@ -160,7 +160,7 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
memset(ret, 0, size);
if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) &&
!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
dma_alloc_need_uncached(dev, attrs)) {
arch_dma_prep_coherent(page, size);
ret = uncached_kernel_address(ret);
}
@@ -182,7 +182,7 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order);
if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) &&
!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT))
dma_alloc_need_uncached(dev, attrs))
cpu_addr = cached_kernel_address(cpu_addr);
__dma_direct_free_pages(dev, size, virt_to_page(cpu_addr));
}