linux-kernel - Re: [PATCH v2 08/12] optee: add optee_pool_op_free

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Message-ID: <CAFA6WYN5JgY67sdk0K8Az6+T5tsQo2wbZaiNX4oigRiKRPaA+A@mail.gmail.com>
Date:   Thu, 20 Jan 2022 16:27:37 +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 08/12] optee: add optee_pool_op_free_helper()

On Fri, 14 Jan 2022 at 20:38, Jens Wiklander <jens.wiklander@...aro.org> wrote:
>
> Adds a common helper function to free a tee_shm allocated using the
> helper function optee_pool_op_alloc_helper().
>
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
>  drivers/tee/optee/core.c          | 10 ++++++++++
>  drivers/tee/optee/ffa_abi.c       |  4 +---
>  drivers/tee/optee/optee_private.h |  3 +++
>  drivers/tee/optee/smc_abi.c       |  7 +++----
>  4 files changed, 17 insertions(+), 7 deletions(-)
>

Reviewed-by: Sumit Garg <sumit.garg@...aro.org>

-Sumit

> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index f4bccb5f0e93..daf947e98d14 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -69,6 +69,16 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
>         return rc;
>  }
>
> +void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> +                              int (*shm_unregister)(struct tee_context *ctx,
> +                                                    struct tee_shm *shm))
> +{
> +       if (shm_unregister)
> +               shm_unregister(shm->ctx, shm);
> +       free_pages((unsigned long)shm->kaddr, get_order(shm->size));
> +       shm->kaddr = NULL;
> +}
> +
>  static void optee_bus_scan(struct work_struct *work)
>  {
>         WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index 5ec484b42432..4cbc45035f92 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -379,9 +379,7 @@ static int pool_ffa_op_alloc(struct tee_shm_pool *pool,
>  static void pool_ffa_op_free(struct tee_shm_pool *pool,
>                              struct tee_shm *shm)
>  {
> -       optee_ffa_shm_unregister(shm->ctx, shm);
> -       free_pages((unsigned long)shm->kaddr, get_order(shm->size));
> -       shm->kaddr = NULL;
> +       optee_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister);
>  }
>
>  static void pool_ffa_op_destroy_pool(struct tee_shm_pool *pool)
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index df3a483bbf46..e77765c78878 100644
> --- a/drivers/tee/optee/optee_private.h
> +++ b/drivers/tee/optee/optee_private.h
> @@ -236,6 +236,9 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
>                                                    struct page **pages,
>                                                    size_t num_pages,
>                                                    unsigned long start));
> +void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> +                              int (*shm_unregister)(struct tee_context *ctx,
> +                                                    struct tee_shm *shm));
>
>
>  void optee_remove_common(struct optee *optee);
> diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> index f2ef76451443..0b27688d1e97 100644
> --- a/drivers/tee/optee/smc_abi.c
> +++ b/drivers/tee/optee/smc_abi.c
> @@ -548,10 +548,9 @@ static void pool_op_free(struct tee_shm_pool *pool,
>                          struct tee_shm *shm)
>  {
>         if (!(shm->flags & TEE_SHM_PRIV))
> -               optee_shm_unregister(shm->ctx, shm);
> -
> -       free_pages((unsigned long)shm->kaddr, get_order(shm->size));
> -       shm->kaddr = NULL;
> +               optee_pool_op_free_helper(pool, shm, optee_shm_unregister);
> +       else
> +               optee_pool_op_free_helper(pool, shm, NULL);
>  }
>
>  static void pool_op_destroy_pool(struct tee_shm_pool *pool)
> --
> 2.31.1
>