Commit efaa6e26 authored by Russell King's avatar Russell King

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: default avatarAndy Gross <agross@codeaurora.org>
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 21caf3a7
......@@ -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
......@@ -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)
......
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