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Date: Thu, 20 Jan 2022 18:33:54 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Jens Wiklander <jens.wiklander@...aro.org>
Cc: linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org,
Herbert Xu <herbert@...dor.apana.org.au>,
Devaraj Rangasamy <Devaraj.Rangasamy@....com>,
Rijo Thomas <Rijo-john.Thomas@....com>,
David Howells <dhowells@...hat.com>,
Tyler Hicks <tyhicks@...ux.microsoft.com>
Subject: Re: [PATCH v2 12/12] tee: refactor TEE_SHM_* flags
On Fri, 14 Jan 2022 at 20:38, Jens Wiklander <jens.wiklander@...aro.org> wrote:
>
> Removes the redundant TEE_SHM_DMA_BUF, TEE_SHM_EXT_DMA_BUF,
> TEE_SHM_MAPPED and TEE_SHM_KERNEL_MAPPED flags.
>
> Assigns new values to the remaining flags to void gaps.
>
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
> drivers/tee/tee_shm.c | 21 ++++++++++-----------
> include/linux/tee_drv.h | 12 ++++--------
> 2 files changed, 14 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> index fe3e5977dd7c..9945bdec086b 100644
> --- a/drivers/tee/tee_shm.c
> +++ b/drivers/tee/tee_shm.c
> @@ -139,8 +139,7 @@ static struct tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size,
> */
> struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size)
> {
> - u32 flags = TEE_SHM_MAPPED | TEE_SHM_DMA_BUF | TEE_SHM_REGISTER |
> - TEE_SHM_POOL;
> + u32 flags = TEE_SHM_REGISTER | TEE_SHM_POOL;
> struct tee_device *teedev = ctx->teedev;
> struct tee_shm *shm;
> void *ret;
> @@ -186,7 +185,7 @@ EXPORT_SYMBOL_GPL(tee_shm_alloc_user_buf);
> */
> struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
> {
> - u32 flags = TEE_SHM_MAPPED | TEE_SHM_REGISTER | TEE_SHM_POOL;
> + u32 flags = TEE_SHM_REGISTER | TEE_SHM_POOL;
>
> return shm_alloc_helper(ctx, size, PAGE_SIZE, flags, -1);
> }
> @@ -211,7 +210,7 @@ EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
> struct tee_shm *tee_shm_alloc_priv_kernel_buf(struct tee_context *ctx,
> size_t size)
> {
> - u32 flags = TEE_SHM_MAPPED | TEE_SHM_PRIV | TEE_SHM_POOL;
> + u32 flags = TEE_SHM_PRIV | TEE_SHM_POOL;
>
> return shm_alloc_helper(ctx, size, sizeof(long) * 2, flags, -1);
> }
> @@ -308,7 +307,7 @@ register_shm_helper(struct tee_context *ctx, unsigned long addr,
> struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx,
> unsigned long addr, size_t length)
> {
> - u32 f = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED | TEE_SHM_REGISTER;
> + u32 f = TEE_SHM_USER_MAPPED | TEE_SHM_REGISTER;
> struct tee_device *teedev = ctx->teedev;
> struct tee_shm *shm;
> void *ret;
> @@ -354,7 +353,7 @@ EXPORT_SYMBOL_GPL(tee_shm_register_user_buf);
> struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
> void *addr, size_t length)
> {
> - u32 f = TEE_SHM_REGISTER | TEE_SHM_KERNEL_MAPPED;
> + u32 f = TEE_SHM_REGISTER;
>
> return register_shm_helper(ctx, (unsigned long)addr, length, f, -1);
> }
> @@ -398,7 +397,7 @@ int tee_shm_get_fd(struct tee_shm *shm)
> {
> int fd;
>
> - if (!(shm->flags & TEE_SHM_DMA_BUF))
> + if (shm->id < 0)
> return -EINVAL;
>
> /* matched by tee_shm_put() in tee_shm_op_release() */
> @@ -428,7 +427,7 @@ EXPORT_SYMBOL_GPL(tee_shm_free);
> */
> int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
> {
> - if (!(shm->flags & TEE_SHM_MAPPED))
> + if (!shm->kaddr)
> return -EINVAL;
> /* Check that we're in the range of the shm */
> if ((char *)va < (char *)shm->kaddr)
> @@ -450,7 +449,7 @@ EXPORT_SYMBOL_GPL(tee_shm_va2pa);
> */
> int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
> {
> - if (!(shm->flags & TEE_SHM_MAPPED))
> + if (!shm->kaddr)
> return -EINVAL;
> /* Check that we're in the range of the shm */
> if (pa < shm->paddr)
> @@ -478,7 +477,7 @@ EXPORT_SYMBOL_GPL(tee_shm_pa2va);
> */
> void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
> {
> - if (!(shm->flags & TEE_SHM_MAPPED))
> + if (!shm->kaddr)
> return ERR_PTR(-EINVAL);
> if (offs >= shm->size)
> return ERR_PTR(-EINVAL);
> @@ -553,7 +552,7 @@ void tee_shm_put(struct tee_shm *shm)
> * the refcount_inc() in tee_shm_get_from_id() never starts
> * from 0.
> */
> - if (shm->flags & TEE_SHM_DMA_BUF)
> + if (shm->id >= 0)
> idr_remove(&teedev->idr, shm->id);
> do_release = true;
> }
> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> index e4f32885e273..dcc7a55e1128 100644
> --- a/include/linux/tee_drv.h
> +++ b/include/linux/tee_drv.h
> @@ -20,14 +20,10 @@
> * specific TEE driver.
> */
>
> -#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 */
> -#define TEE_SHM_REGISTER BIT(3) /* Memory registered in secure world */
> -#define TEE_SHM_USER_MAPPED BIT(4) /* Memory mapped in user space */
> -#define TEE_SHM_POOL BIT(5) /* Memory allocated from pool */
> -#define TEE_SHM_KERNEL_MAPPED BIT(6) /* Memory mapped in kernel space */
> -#define TEE_SHM_PRIV BIT(7) /* Memory private to TEE driver */
> +#define TEE_SHM_REGISTER BIT(0) /* Memory registered in secure world */
TEE_SHM_REGISTER as a flag name seems ambiguous to me when it is being
used by both types of APIs tee_shm_alloc_* and tee_shm_register_*. Can
we rename it to TEE_SHM_DYNAMIC instead?
-Sumit
> +#define TEE_SHM_USER_MAPPED BIT(1) /* Memory mapped in user space */
> +#define TEE_SHM_POOL BIT(2) /* Memory allocated from pool */
> +#define TEE_SHM_PRIV BIT(3) /* Memory private to TEE driver */
>
> struct device;
> struct tee_device;
> --
> 2.31.1
>
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