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SubjectRe: [PATCH 5/9] dma-buf: heaps: mtk_sec_heap: Initialise tee session
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Il 11/09/23 04:30, Yong Wu ha scritto:
> The TEE probe later than dma-buf heap, and PROBE_DEDER doesn't work
> here since this is not a platform driver, therefore initialise the TEE
> context/session while we allocate the first secure buffer.
>
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> ---
> drivers/dma-buf/heaps/mtk_secure_heap.c | 61 +++++++++++++++++++++++++
> 1 file changed, 61 insertions(+)
>
> diff --git a/drivers/dma-buf/heaps/mtk_secure_heap.c b/drivers/dma-buf/heaps/mtk_secure_heap.c
> index bbf1c8dce23e..e3da33a3d083 100644
> --- a/drivers/dma-buf/heaps/mtk_secure_heap.c
> +++ b/drivers/dma-buf/heaps/mtk_secure_heap.c
> @@ -10,6 +10,12 @@
> #include <linux/err.h>
> #include <linux/module.h>
> #include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +#include <linux/uuid.h>
> +
> +#define TZ_TA_MEM_UUID "4477588a-8476-11e2-ad15-e41f1390d676"
> +

Is this UUID the same for all SoCs and all TZ versions?

Thanks,
Angelo


> +#define MTK_TEE_PARAM_NUM 4
>
> /*
> * MediaTek secure (chunk) memory type
> @@ -28,17 +34,72 @@ struct mtk_secure_heap_buffer {
> struct mtk_secure_heap {
> const char *name;
> const enum kree_mem_type mem_type;
> + u32 mem_session;
> + struct tee_context *tee_ctx;
> };
>
> +static int mtk_optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
> +{
> + return ver->impl_id == TEE_IMPL_ID_OPTEE;
> +}
> +
> +static int mtk_kree_secure_session_init(struct mtk_secure_heap *sec_heap)
> +{
> + struct tee_param t_param[MTK_TEE_PARAM_NUM] = {0};
> + struct tee_ioctl_open_session_arg arg = {0};
> + uuid_t ta_mem_uuid;
> + int ret;
> +
> + sec_heap->tee_ctx = tee_client_open_context(NULL, mtk_optee_ctx_match,
> + NULL, NULL);
> + if (IS_ERR(sec_heap->tee_ctx)) {
> + pr_err("%s: open context failed, ret=%ld\n", sec_heap->name,
> + PTR_ERR(sec_heap->tee_ctx));
> + return -ENODEV;
> + }
> +
> + arg.num_params = MTK_TEE_PARAM_NUM;
> + arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
> + ret = uuid_parse(TZ_TA_MEM_UUID, &ta_mem_uuid);
> + if (ret)
> + goto close_context;
> + memcpy(&arg.uuid, &ta_mem_uuid.b, sizeof(ta_mem_uuid));
> +
> + ret = tee_client_open_session(sec_heap->tee_ctx, &arg, t_param);
> + if (ret < 0 || arg.ret) {
> + pr_err("%s: open session failed, ret=%d:%d\n",
> + sec_heap->name, ret, arg.ret);
> + ret = -EINVAL;
> + goto close_context;
> + }
> + sec_heap->mem_session = arg.session;
> + return 0;
> +
> +close_context:
> + tee_client_close_context(sec_heap->tee_ctx);
> + return ret;
> +}
> +
> static struct dma_buf *
> mtk_sec_heap_allocate(struct dma_heap *heap, size_t size,
> unsigned long fd_flags, unsigned long heap_flags)
> {
> + struct mtk_secure_heap *sec_heap = dma_heap_get_drvdata(heap);
> struct mtk_secure_heap_buffer *sec_buf;
> DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> struct dma_buf *dmabuf;
> int ret;
>
> + /*
> + * TEE probe may be late. Initialise the secure session in the first
> + * allocating secure buffer.
> + */
> + if (!sec_heap->mem_session) {
> + ret = mtk_kree_secure_session_init(sec_heap);
> + if (ret)
> + return ERR_PTR(ret);
> + }
> +
> sec_buf = kzalloc(sizeof(*sec_buf), GFP_KERNEL);
> if (!sec_buf)
> return ERR_PTR(-ENOMEM);

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