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

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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: Zhenhua Huang <zhenhuah@codeaurora.org>
This commit is contained in:
Zhenhua Huang 2020-07-22 11:29:39 +08:00
commit 532b5fece2
1 changed files with 29 additions and 0 deletions
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29
drivers/soc/qcom/secure_buffer.c
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@ -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: