diff options
| author | Etienne Carriere <etienne.carriere@linaro.org> | 2016-10-27 23:18:35 +0200 |
|---|---|---|
| committer | Jason Liu <jason.hui.liu@nxp.com> | 2018-10-29 11:10:38 +0800 |
| commit | ddaa5e12c14b207cc4ef90ae087d37472ef20a54 (patch) | |
| tree | 52cc01274cde78c15217fbfc44cad6d5cd35ecd5 /include/linux | |
| parent | fb0de28aef26f4760c99d81bb5c99e7de5552416 (diff) | |
tee: new ioctl to a register tee_shm from a dmabuf file descriptor
This change allows userland to create a tee_shm object that refers
to a dmabuf reference.
Userland provides a dmabuf file descriptor as buffer reference.
The created tee_shm object exported as a brand new dmabuf reference
used to provide a clean fd to userland. Userland shall closed this new
fd to release the tee_shm object resources. The initial dmabuf resources
are tracked independently through original dmabuf file descriptor.
Once the buffer is registered and until it is released, TEE driver
keeps a refcount on the registered dmabuf structure.
This change only support dmabuf references that relates to physically
contiguous memory buffers.
New tee_shm flag to identify tee_shm objects built from a registered
dmabuf: TEE_SHM_EXT_DMA_BUF. Such tee_shm structures are flagged both
TEE_SHM_DMA_BUF and TEE_SHM_EXT_DMA_BUF.
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
From: https://github.com/linaro-swg/linux.git
(cherry picked from commit 41e21e5c405530590dc2dd10b2a8dbe64589840f)
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/tee_drv.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index cb889afe576b..9cd6d57c8360 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -25,8 +25,9 @@ * specific TEE driver. */ -#define TEE_SHM_MAPPED 0x1 /* Memory mapped by the kernel */ -#define TEE_SHM_DMA_BUF 0x2 /* Memory with dma-buf handle */ +#define TEE_SHM_MAPPED BIT(0) /* Memory mapped by the kernel */ +#define TEE_SHM_DMA_BUF BIT(1) /* Memory with dma-buf handle */ +#define TEE_SHM_EXT_DMA_BUF BIT(2) /* Memory with dma-buf handle */ struct device; struct tee_device; @@ -211,6 +212,16 @@ void *tee_get_drvdata(struct tee_device *teedev); struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags); /** + * tee_shm_register_fd() - Register shared memory from file descriptor + * + * @ctx: Context that allocates the shared memory + * @fd: shared memory file descriptor reference. + * + * @returns a pointer to 'struct tee_shm' + */ +struct tee_shm *tee_shm_register_fd(struct tee_context *ctx, int fd); + +/** * tee_shm_free() - Free shared memory * @shm: Handle to shared memory to free */ |