Re: [PATCH 3/7] tee: add tee_shm_alloc_kernel_buf()

Tyler Hicks
2021-06-09T14:51:26Z

On 2021-06-09 12:23:20, Jens Wiklander wrote:
> Adds a new function tee_shm_alloc_kernel_buf() to allocate shared memory
> from a kernel driver. This function can later be made more lightweight
> by unnecessary dma-buf export.
>
> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>

Tyler

> ---
> drivers/tee/tee_shm.c | 18 ++++++++++++++++++
> include/linux/tee_drv.h | 1 +
> 2 files changed, 19 insertions(+)
>
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> index b9dbf4bce149..63fce8d39d8b 100644
> --- a/drivers/tee/tee_shm.c
> +++ b/drivers/tee/tee_shm.c
> @@ -192,6 +192,24 @@ struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
> }
> EXPORT_SYMBOL_GPL(tee_shm_alloc);
>
> +/**
> + * tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
> + * @ctx: Context that allocates the shared memory
> + * @size: Requested size of shared memory
> + *
> + * The returned memory registered in secure world and is suitable to be
> + * passed as a memory buffer in parameter argument to
> + * tee_client_invoke_func(). The memory allocated is later freed with a
> + * call to tee_shm_free().
> + *
> + * @returns a pointer to 'struct tee_shm'
> + */
> +struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
> +{
> + return tee_shm_alloc(ctx, size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
> +
> struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
> size_t length, u32 flags)
> {
> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> index 62b7c7a55743..58b319766f8e 100644
> --- a/include/linux/tee_drv.h
> +++ b/include/linux/tee_drv.h
> @@ -282,6 +282,7 @@ void *tee_get_drvdata(struct tee_device *teedev);
> * @returns a pointer to 'struct tee_shm'
> */
> struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags);
> +struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
>
> /**
> * tee_shm_register() - Register shared memory buffer
> --
> 2.31.1
>