Re: [PATCH v2 8/8] dma-buf: heaps: secure_heap: Add normal CMA heap

Jeffrey Kardatzke
2023-11-15T23:45:48Z

You should drop this patch completely.

On Sat, Nov 11, 2023 at 3:18 AM Yong Wu <yong.wu@mediatek.com> wrote:
>
> Add a normal CMA heap which use the standard cma allocate.
>
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> ---
> Hi Vijay and Jaskaran,
>
> For this heap,
> 1) It uses sec_heap_buf_ops currently. I guess we cann't use the
> cma_heap_buf_ops. since if it is secure buffer, some operations such
> as mmap should not be allowed.
> 2) I didn't add how to protect/secure the buffer.
>
> Please feel free to change to meet your requirements.
> Thanks.
> ---
> drivers/dma-buf/heaps/secure_heap.c | 38 ++++++++++++++++++++++++++++-
> 1 file changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/heaps/secure_heap.c b/drivers/dma-buf/heaps/secure_heap.c
> index f8b84fd16288..8989ad5d03e9 100644
> --- a/drivers/dma-buf/heaps/secure_heap.c
> +++ b/drivers/dma-buf/heaps/secure_heap.c
> @@ -43,6 +43,8 @@ enum secure_buffer_tee_cmd { /* PARAM NUM always is 4. */
> };
>
> enum secure_memory_type {
> + /* CMA for the secure memory, Use the normal cma ops to alloc/free. */
> + SECURE_MEMORY_TYPE_CMA = 0,
> /*
> * MediaTek static chunk memory carved out for TrustZone. The memory
> * management is inside the TEE.
> @@ -65,6 +67,7 @@ struct secure_buffer {
> * a value got from TEE.
> */
> u32 sec_handle;
> + struct page *cma_page;
> };
>
> #define TEE_MEM_COMMAND_ID_BASE_MTK 0x10000
> @@ -287,6 +290,33 @@ const struct secure_heap_prv_data mtk_sec_mem_data = {
> .unsecure_the_memory = secure_heap_tee_unsecure_memory,
> };
>
> +static int cma_secure_memory_allocate(struct secure_heap *sec_heap,
> + struct secure_buffer *sec_buf)
> +{
> + if (!sec_heap->cma)
> + return -EINVAL;
> +
> + sec_buf->cma_page = cma_alloc(sec_heap->cma, sec_buf->size >> PAGE_SHIFT,
> + get_order(PAGE_SIZE), false);
> + if (!sec_buf->cma_page)
> + return -ENOMEM;
> +
> + memset(page_address(sec_buf->cma_page), 0, sec_buf->size);
> + return 0;
> +}
> +
> +static void cma_secure_memory_free(struct secure_heap *sec_heap,
> + struct secure_buffer *sec_buf)
> +{
> + cma_release(sec_heap->cma, sec_buf->cma_page, sec_buf->size >> PAGE_SHIFT);
> +}
> +
> +const struct secure_heap_prv_data cma_sec_mem_data = {
> + .memory_alloc = cma_secure_memory_allocate,
> + .memory_free = cma_secure_memory_free,
> + /* TODO : secure the buffer. */
> +};
> +
> static int secure_heap_secure_memory_allocate(struct secure_heap *sec_heap,
> struct secure_buffer *sec_buf)
> {
> @@ -496,6 +526,11 @@ static const struct dma_heap_ops sec_heap_ops = {
> };
>
> static struct secure_heap secure_heaps[] = {
> + {
> + .name = "secure_cma",
> + .mem_type = SECURE_MEMORY_TYPE_CMA,
> + .data = &cma_sec_mem_data,
> + },
> {
> .name = "secure_mtk_cm",
> .mem_type = SECURE_MEMORY_TYPE_MTK_CM_TZ,
> @@ -522,7 +557,8 @@ static int __init secure_cma_init(struct reserved_mem *rmem)
> }
>
> for (i = 0; i < ARRAY_SIZE(secure_heaps); i++, sec_heap++) {
> - if (sec_heap->mem_type != SECURE_MEMORY_TYPE_MTK_CM_CMA)
> + if (sec_heap->mem_type != SECURE_MEMORY_TYPE_MTK_CM_CMA &&
> + sec_heap->mem_type != SECURE_MEMORY_TYPE_CMA)
> continue;
>
> sec_heap->cma = sec_cma;
> --
> 2.25.1
>