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Make kmalloc'ed memory really DMA-safe

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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>
This commit is contained in:
Masahiro Yamada 2018-08-24 19:30:15 +09:00 committed by Tom Rini
parent 4b0a2d3aab
commit e3332e1a1a
1 changed files with 3 additions and 2 deletions
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5
lib/linux_compat.c
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@ -1,5 +1,6 @@
#include <common.h> #include <common.h>
#include <memalign.h>
#include <linux/compat.h> #include <linux/compat.h>
struct p_current cur = { struct p_current cur = {
@ -18,7 +19,7 @@ void *kmalloc(size_t size, int flags)
{ {
void *p; void *p;
p = memalign(ARCH_DMA_MINALIGN, size); p = malloc_cache_aligned(size);
if (flags & __GFP_ZERO) if (flags & __GFP_ZERO)
memset(p, 0, size); 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) void *kmem_cache_alloc(struct kmem_cache *obj, int flag)
{ {
return memalign(ARCH_DMA_MINALIGN, obj->sz); return malloc_cache_aligned(obj->sz);
} }