diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-24 09:21:02 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-08-11 17:45:00 (GMT) |
commit | efaa6e266ba70439da00e7f1c8a218e243ae140a (patch) | |
tree | bd7d7d35ba8575eccfcc01d2338e2a91c8357ff5 /arch/arm/include/asm | |
parent | 21caf3a765b0a88f8fedf63b36e5d15683b73fe5 (diff) | |
download | linux-efaa6e266ba70439da00e7f1c8a218e243ae140a.tar.xz |
firmware: qcom_scm-32: replace open-coded call to __cpuc_flush_dcache_area()
Rathe rthan directly accessing architecture internal functions, provide
an "method"-centric wrapper for qcom_scm-32 to do what's necessary to
ensure that the secure monitor can see the data. This is called
"secure_flush_area" and ensures that the specified memory area is
coherent across the secure boundary.
Acked-by: Andy Gross <agross@codeaurora.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm')
-rw-r--r-- | arch/arm/include/asm/cacheflush.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h index c5230a4..d5525bf 100644 --- a/arch/arm/include/asm/cacheflush.h +++ b/arch/arm/include/asm/cacheflush.h @@ -502,4 +502,21 @@ static inline void set_kernel_text_ro(void) { } void flush_uprobe_xol_access(struct page *page, unsigned long uaddr, void *kaddr, unsigned long len); +/** + * secure_flush_area - ensure coherency across the secure boundary + * @addr: virtual address + * @size: size of region + * + * Ensure that the specified area of memory is coherent across the secure + * boundary from the non-secure side. This is used when calling secure + * firmware where the secure firmware does not ensure coherency. + */ +static inline void secure_flush_area(const void *addr, size_t size) +{ + phys_addr_t phys = __pa(addr); + + __cpuc_flush_dcache_area((void *)addr, size); + outer_flush_range(phys, phys + size); +} + #endif |