linux-kernel - Re: [PATCH] firmware: arm_scmi: optee: Drop the support for the OPTEE shared dynamic buffer

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Message-ID: <20211125182543.GE56473@e120937-lin>
Date:   Thu, 25 Nov 2021 18:25:43 +0000
From:   Cristian Marussi <cristian.marussi@....com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Etienne Carriere <etienne.carriere@...aro.org>
Subject: Re: [PATCH] firmware: arm_scmi: optee: Drop the support for the
 OPTEE shared dynamic buffer

On Thu, Nov 25, 2021 at 03:07:30PM +0000, Sudeep Holla wrote:
> The shared memory buffer allocated by the optee driver is normal cached
> memory and can't be used with IOMEM APIs used in shmem_*.
> 
> We currently support only IO memory for shared memory and supporting
> normal cached memory needs more changes and needs to be thought through
> properly. So for now, let us drop the support for this OPTEE shared buffer.
> 
> Cc: Cristian Marussi <cristian.marussi@....com>
> Cc: Etienne Carriere <etienne.carriere@...aro.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---

Hi,


>  drivers/firmware/arm_scmi/optee.c | 19 +------------------
>  1 file changed, 1 insertion(+), 18 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
> index 901737c9f5f8..175b39bcd470 100644
> --- a/drivers/firmware/arm_scmi/optee.c
> +++ b/drivers/firmware/arm_scmi/optee.c
> @@ -282,23 +282,6 @@ static void scmi_optee_clear_channel(struct scmi_chan_info *cinfo)
>  	shmem_clear_channel(channel->shmem);
>  }
>  
> -static int setup_dynamic_shmem(struct device *dev, struct scmi_optee_channel *channel)
> -{
> -	const size_t msg_size = SCMI_OPTEE_MAX_MSG_SIZE;
> -
> -	channel->tee_shm = tee_shm_alloc_kernel_buf(scmi_optee_private->tee_ctx, msg_size);
> -	if (IS_ERR(channel->tee_shm)) {
> -		dev_err(channel->cinfo->dev, "shmem allocation failed\n");
> -		return -ENOMEM;
> -	}
> -
> -	channel->shmem = (void *)tee_shm_get_va(channel->tee_shm, 0);
> -	memset(channel->shmem, 0, msg_size);
> -	shmem_clear_channel(channel->shmem);
> -
> -	return 0;
> -}
> -
>  static int setup_static_shmem(struct device *dev, struct scmi_chan_info *cinfo,
>  			      struct scmi_optee_channel *channel)
>  {
> @@ -342,7 +325,7 @@ static int setup_shmem(struct device *dev, struct scmi_chan_info *cinfo,
>  	if (of_find_property(cinfo->dev->of_node, "shmem", NULL))
>  		return setup_static_shmem(dev, cinfo, channel);
>  	else
> -		return setup_dynamic_shmem(dev, channel);
> +		return -ENOMEM;
>  }
>  

LGTM.

Reviewed-by: Cristian Marussi <cristian.marussi@....com>

Thanks,
Cristian