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firmware: qcom_scm-32: replace open-coded call to __cpuc_flush_dcache_area()

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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>
This commit is contained in:
Russell King 2015-07-24 10:21:02 +01:00
parent 21caf3a765
commit efaa6e266b
2 changed files with 18 additions and 3 deletions
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17
arch/arm/include/asm/cacheflush.h
View File

@ -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

4
drivers/firmware/qcom_scm-32.c
View File

@ -24,7 +24,6 @@
#include <linux/err.h>
#include <linux/qcom_scm.h>
#include <asm/outercache.h>
#include <asm/cacheflush.h>
#include "qcom_scm.h"
@ -219,8 +218,7 @@ static int __qcom_scm_call(const struct qcom_scm_command *cmd)
* Flush the command buffer so that the secure world sees
* the correct data.
*/
__cpuc_flush_dcache_area((void *)cmd, cmd->len);
outer_flush_range(cmd_addr, cmd_addr + cmd->len);
secure_flush_area(cmd, cmd->len);
ret = smc(cmd_addr);
if (ret < 0)