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Do not flush the cache in flush_cache_v(un)map for VIPT caches

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In case of non-aliasing VIPT caches, there is no need to flush the whole
cache when new mapping is created. The patch introduces this condition
check. In the non-aliasing VIPT case flush_cache_vmap() needs a DSB
since the set_pte_at() function called from vmap_pte_range() does not
have such barrier (done usually via TLB flushing functions).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2008-11-06 13:23:08 +00:00
parent 24b647a042
commit 376e14218d
1 changed files with 26 additions and 10 deletions
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36
arch/arm/include/asm/cacheflush.h
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@ -15,6 +15,7 @@
#include <asm/glue.h>
#include <asm/shmparam.h>
#include <asm/cachetype.h>
#define CACHE_COLOUR(vaddr) ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
@ -295,16 +296,6 @@ static inline void outer_flush_range(unsigned long start, unsigned long end)
#endif
/*
* flush_cache_vmap() is used when creating mappings (eg, via vmap,
* vmalloc, ioremap etc) in kernel space for pages. Since the
* direct-mappings of these pages may contain cached data, we need
* to do a full cache flush to ensure that writebacks don't corrupt
* data placed into these pages via the new mappings.
*/
#define flush_cache_vmap(start, end) flush_cache_all()
#define flush_cache_vunmap(start, end) flush_cache_all()
/*
* Copy user data from/to a page which is mapped into a different
* processes address space. Really, we want to allow our "user
@ -444,4 +435,29 @@ static inline void flush_ioremap_region(unsigned long phys, void __iomem *virt,
dmac_inv_range(start, start + size);
}
/*
* flush_cache_vmap() is used when creating mappings (eg, via vmap,
* vmalloc, ioremap etc) in kernel space for pages. On non-VIPT
* caches, since the direct-mappings of these pages may contain cached
* data, we need to do a full cache flush to ensure that writebacks
* don't corrupt data placed into these pages via the new mappings.
*/
static inline void flush_cache_vmap(unsigned long start, unsigned long end)
{
if (!cache_is_vipt_nonaliasing())
flush_cache_all();
else
/*
* set_pte_at() called from vmap_pte_range() does not
* have a DSB after cleaning the cache line.
*/
dsb();
}
static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
{
if (!cache_is_vipt_nonaliasing())
flush_cache_all();
}
#endif