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Commit 532b5fec authored by Zhenhua Huang's avatar Zhenhua Huang
Browse files

soc: qcom: secure_buffer: track all hyp based secure pages 



To track all secure pages which are not stage 2 mapped to APPS, add a
MAGIC in page->private.

Change-Id: I4674f74eca95eeb36f004185a5d9cb0d63d558b0
Signed-off-by: default avatarZhenhua Huang <zhenhuah@codeaurora.org>
parent c322899f

drivers/soc/qcom/secure_buffer.c

+29 −0
Original line number Diff line number Diff line
@@ -145,6 +145,22 @@ static int batched_hyp_assign(struct sg_table *table, u32 *source_vmids, 
	return ret;

}



static inline void set_each_page_of_sg(struct sg_table *table, u64 flag)

{

	struct scatterlist *sg;

	int npages;

	int i = 0;



	for_each_sg(table->sgl, sg, table->nents, i) {

		npages = sg->length / PAGE_SIZE;

		if (sg->length % PAGE_SIZE)

			npages++;

		while (npages--)

			set_page_private(nth_page(sg_page(sg), npages), flag);

	}

}



#define SECURE_PAGE_MAGIC 0xEEEEEEEE

/*

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

 *  a usable state and should no longer be accessed by the HLOS.
@@ -206,6 +222,19 @@ int hyp_assign_table(struct sg_table *table, 
	ret = batched_hyp_assign(table, source_vm_copy, source_vm_copy_size,

				 dest_vm_copy, dest_vm_copy_size);



	if (!ret) {

		while (dest_nelems--) {

			if (dest_vmids[dest_nelems] == VMID_HLOS)

				break;

		}



		if (dest_nelems == -1)

			set_each_page_of_sg(table, SECURE_PAGE_MAGIC);

		else

			set_each_page_of_sg(table, 0);

	}





	dma_unmap_single(qcom_secure_buffer_dev, dest_dma_addr,

			 dest_vm_copy_size, DMA_TO_DEVICE);

out_free_dest: