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Commit 724d27be authored by Zhenhua Huang's avatar Zhenhua Huang Committed by Gerrit - the friendly Code Review server
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soc: qcom: secure_buffer: add API page_accessible 



Add page_accessible to check if page is secure or not. It is used
to avoid EL2 fault for dumping memory region.

Change-Id: If71a810997fc97722722339a25839249bd05d9e2
Signed-off-by: default avatarZhenhua Huang <zhenhuah@codeaurora.org>
parent 532b5fec

drivers/soc/qcom/secure_buffer.c

+10 −0
Original line number Diff line number Diff line
@@ -161,6 +161,16 @@ static inline void set_each_page_of_sg(struct sg_table *table, u64 flag) 
}



#define SECURE_PAGE_MAGIC 0xEEEEEEEE

int page_accessible(unsigned long pfn)

{

	struct page *page = pfn_to_page(pfn);



	if (page->private == SECURE_PAGE_MAGIC)

		return 0;

	else

		return 1;

}



/*

 *  When -EADDRNOTAVAIL is returned the memory may no longer be in

 *  a usable state and should no longer be accessed by the HLOS.

include/soc/qcom/secure_buffer.h

+6 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ int hyp_assign_phys(phys_addr_t addr, u64 size, 
			int *dest_vmids, int *dest_perms, int dest_nelems);

const char *msm_secure_vmid_to_string(int secure_vmid);

u32 msm_secure_get_vmid_perms(u32 vmid);

int page_accessible(unsigned long pfn);

#else

static inline int hyp_assign_table(struct sg_table *table,

			u32 *source_vm_list, int source_nelems,
@@ -79,5 +80,10 @@ static inline u32 msm_secure_get_vmid_perms(u32 vmid) 
{

	return 0;

}



static inline int page_accessible(unsigned long pfn)

{

	return 1;

}

#endif

#endif