On Mon, 2023-09-11 at 11:29 +0200, AngeloGioacchino Del Regno wrote:
> 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 <[email protected]>
> > ---
> > 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?
Yes. It is the same for all SoCs and all TZ versions currently.
>
> 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);
>
>
