linux-kernel - Re: [PATCH v2 06/10] firmware: arm_ffa: Make memory apis ffa

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Message-ID: <CAHUa44FJtwidcxmPqZ3Fttq4J3QrFxvQh-o=0LnfGRBnFGfk4w@mail.gmail.com>
Date:   Wed, 7 Sep 2022 10:27:57 +0200
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org,
        Marc Bonnici <marc.bonnici@....com>,
        Achin Gupta <achin.gupta@....com>,
        Valentin Laurent <valentin.laurent@...stonic.com>,
        Lukas Hanel <lukas.hanel@...stonic.com>,
        Coboy Chen <coboy.chen@...iatek.com>
Subject: Re: [PATCH v2 06/10] firmware: arm_ffa: Make memory apis ffa_device independent

On Fri, Sep 2, 2022 at 2:40 PM Sudeep Holla <sudeep.holla@....com> wrote:
>
> There is a requirement to make memory APIs independent of the ffa_device.
> One of the use-case is to have a common memory driver that manages the
> memory for all the ffa_devices. That common memory driver won't be a
> ffa_driver or won't have any ffa_device associated with it. So having
> these memory APIs accessible without a ffa_device is needed and should
> be possible as most of these are handled by the partition manager(SPM
> or hypervisor).
>
> Drop the ffa_device argument to the memory APIs and make them ffa_device
> independent.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/firmware/arm_ffa/driver.c | 6 ++----
>  drivers/tee/optee/ffa_abi.c       | 2 +-
>  include/linux/arm_ffa.h           | 6 ++----
>  3 files changed, 5 insertions(+), 9 deletions(-)

Acked-by: Jens Wiklander <jens.wiklander@...aro.org>

>
> diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
> index 37a8ee304508..e4fd35773071 100644
> --- a/drivers/firmware/arm_ffa/driver.c
> +++ b/drivers/firmware/arm_ffa/driver.c
> @@ -643,8 +643,7 @@ static int ffa_sync_send_receive(struct ffa_device *dev,
>                                        dev->mode_32bit, data);
>  }
>
> -static int
> -ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args)
> +static int ffa_memory_share(struct ffa_mem_ops_args *args)
>  {
>         if (drv_info->mem_ops_native)
>                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
> @@ -652,8 +651,7 @@ ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args)
>         return ffa_memory_ops(FFA_MEM_SHARE, args);
>  }
>
> -static int
> -ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args)
> +static int ffa_memory_lend(struct ffa_mem_ops_args *args)
>  {
>         /* Note that upon a successful MEM_LEND request the caller
>          * must ensure that the memory region specified is not accessed
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index 3d4079575ccd..7257b42d0545 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -294,7 +294,7 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
>         if (rc)
>                 return rc;
>         args.sg = sgt.sgl;
> -       rc = ffa_ops->memory_share(ffa_dev, &args);
> +       rc = ffa_ops->memory_share(&args);
>         sg_free_table(&sgt);
>         if (rc)
>                 return rc;
> diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
> index 556f50f27fb1..eafab07c9f58 100644
> --- a/include/linux/arm_ffa.h
> +++ b/include/linux/arm_ffa.h
> @@ -262,10 +262,8 @@ struct ffa_dev_ops {
>         int (*sync_send_receive)(struct ffa_device *dev,
>                                  struct ffa_send_direct_data *data);
>         int (*memory_reclaim)(u64 g_handle, u32 flags);
> -       int (*memory_share)(struct ffa_device *dev,
> -                           struct ffa_mem_ops_args *args);
> -       int (*memory_lend)(struct ffa_device *dev,
> -                          struct ffa_mem_ops_args *args);
> +       int (*memory_share)(struct ffa_mem_ops_args *args);
> +       int (*memory_lend)(struct ffa_mem_ops_args *args);
>  };
>
>  #endif /* _LINUX_ARM_FFA_H */
> --
> 2.37.3
>