On 9/11/2023 8:00 AM, Yong Wu wrote:
> Add TEE service call for secure memory allocating/freeing.
>
> Signed-off-by: Anan Sun <anan....@mediatek.com>
> Signed-off-by: Yong Wu <yong...@mediatek.com>
> ---
> drivers/dma-buf/heaps/mtk_secure_heap.c | 69 ++++++++++++++++++++++++-
> 1 file changed, 68 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/heaps/mtk_secure_heap.c
> b/drivers/dma-buf/heaps/mtk_secure_heap.c
> index e3da33a3d083..14c2a16a7164 100644
> --- a/drivers/dma-buf/heaps/mtk_secure_heap.c
> +++ b/drivers/dma-buf/heaps/mtk_secure_heap.c
> @@ -17,6 +17,9 @@
>
> #define MTK_TEE_PARAM_NUM 4
>
> +#define TZCMD_MEM_SECURECM_UNREF 7
> +#define TZCMD_MEM_SECURECM_ZALLOC 15
> +
> /*
> * MediaTek secure (chunk) memory type
> *
> @@ -29,6 +32,8 @@ enum kree_mem_type {
> struct mtk_secure_heap_buffer {
> struct dma_heap *heap;
> size_t size;
> +
> + u32 sec_handle;
> };
>
> struct mtk_secure_heap {
> @@ -80,6 +85,63 @@ static int mtk_kree_secure_session_init(struct
> mtk_secure_heap *sec_heap)
> return ret;
> }
>
> +static int
> +mtk_sec_mem_tee_service_call(struct tee_context *tee_ctx, u32 session,
> + unsigned int command, struct tee_param *params)
> +{
> + struct tee_ioctl_invoke_arg arg = {0};
> + int ret;
> +
> + arg.num_params = MTK_TEE_PARAM_NUM;
> + arg.session = session;
> + arg.func = command;
> +
> + ret = tee_client_invoke_func(tee_ctx, &arg, params);
> + if (ret < 0 || arg.ret) {
> + pr_err("%s: cmd %d ret %d:%x.\n", __func__, command, ret,
> arg.ret);
> + ret = -EOPNOTSUPP;
> + }
> + return ret;
> +}
> +
> +static int mtk_sec_mem_allocate(struct mtk_secure_heap *sec_heap,
> + struct mtk_secure_heap_buffer *sec_buf)
> +{
> + struct tee_param params[MTK_TEE_PARAM_NUM] = {0};
> + u32 mem_session = sec_heap->mem_session;
> + int ret;
> +
> + params[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
> + params[0].u.value.a = SZ_4K; /* alignment */
> + params[0].u.value.b = sec_heap->mem_type; /* memory type */
> + params[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
> + params[1].u.value.a = sec_buf->size;
> + params[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
> +
> + /* Always request zeroed buffer */
> + ret = mtk_sec_mem_tee_service_call(sec_heap->tee_ctx, mem_session,
> + TZCMD_MEM_SECURECM_ZALLOC, params);
I see here optee calls are being used to secure memory.
For a secure heap, there can be multiple ways on how we want to secure memory,
for eg : by using qcom_scm_assign_mem.
This interface restricts securing memory to only optee calls.
can we have a way to choose ops that we want to secure memory ?
Thanks,
Vijay
> + if (ret)
> + return -ENOMEM;
> +
> + sec_buf->sec_handle = params[2].u.value.a;
> + return 0;
> +}
> +
> +static void mtk_sec_mem_release(struct mtk_secure_heap *sec_heap,
> + struct mtk_secure_heap_buffer *sec_buf)
> +{
> + struct tee_param params[MTK_TEE_PARAM_NUM] = {0};
> + u32 mem_session = sec_heap->mem_session;
> +
> + params[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
> + params[0].u.value.a = sec_buf->sec_handle;
> + params[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
> +
> + mtk_sec_mem_tee_service_call(sec_heap->tee_ctx, mem_session,
> + TZCMD_MEM_SECURECM_UNREF, params);
> +}
> +
> static struct dma_buf *
> mtk_sec_heap_allocate(struct dma_heap *heap, size_t size,
> unsigned long fd_flags, unsigned long heap_flags)
> @@ -107,6 +169,9 @@ mtk_sec_heap_allocate(struct dma_heap *heap, size_t size,
> sec_buf->size = size;
> sec_buf->heap = heap;
>
> + ret = mtk_sec_mem_allocate(sec_heap, sec_buf);
> + if (ret)
> + goto err_free_buf;
> exp_info.exp_name = dma_heap_get_name(heap);
> exp_info.size = sec_buf->size;
> exp_info.flags = fd_flags;
> @@ -115,11 +180,13 @@ mtk_sec_heap_allocate(struct dma_heap *heap, size_t
> size,
> dmabuf = dma_buf_export(&exp_info);
> if (IS_ERR(dmabuf)) {
> ret = PTR_ERR(dmabuf);
> - goto err_free_buf;
> + goto err_free_sec_mem;
> }
>
> return dmabuf;
>
> +err_free_sec_mem:
> + mtk_sec_mem_release(sec_heap, sec_buf);
> err_free_buf:
> kfree(sec_buf);
> return ERR_PTR(ret);
