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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-08-24 19:30:15 +0900 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-08-31 11:59:44 -0400 |
| commit | e3332e1a1a04534225801c2710c6faef4809641c (patch) | |
| tree | 8e1777b9ee2feb63c12ae19d7bd1aa01032bd4a9 | |
| parent | 4b0a2d3aabeba4df186113ef0c5edc25cec6001b (diff) | |
| download | u-boot-e3332e1a1a04534225801c2710c6faef4809641c.tar.gz | |
Make kmalloc'ed memory really DMA-safe
In Linux, the memory returned by kmalloc() is DMA-capable.
However, it is not true in U-Boot.
At a glance, kmalloc() in U-Boot returns address aligned with
ARCH_DMA_MINALIGN. However, it never pads the allocated memory.
This half-way house is completely useless because calling kmalloc()
and malloc() in this order causes a cache sharing problem.
Change the implementation to call malloc_cache_aligned(), which
allocates really DMA-capable memory.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
| -rw-r--r-- | lib/linux_compat.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/linux_compat.c b/lib/linux_compat.c index a936a7eac2..6373b4451e 100644 --- a/lib/linux_compat.c +++ b/lib/linux_compat.c @@ -1,5 +1,6 @@ #include <common.h> +#include <memalign.h> #include <linux/compat.h> struct p_current cur = { @@ -18,7 +19,7 @@ void *kmalloc(size_t size, int flags) { void *p; - p = memalign(ARCH_DMA_MINALIGN, size); + p = malloc_cache_aligned(size); if (flags & __GFP_ZERO) memset(p, 0, size); @@ -37,5 +38,5 @@ struct kmem_cache *get_mem(int element_sz) void *kmem_cache_alloc(struct kmem_cache *obj, int flag) { - return memalign(ARCH_DMA_MINALIGN, obj->sz); + return malloc_cache_aligned(obj->sz); } |