On Tue, Mar 03, 2020 at 10:06:59AM +0800, peng.fan@xxxxxxx wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
>
> Take arm,smc-id as the 1st arg, leave the other args as zero for now.
> There is no Rx, only Tx because of smc/hvc not support Rx.
>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
[...]
> +static int smc_send_message(struct scmi_chan_info *cinfo,
> + struct scmi_xfer *xfer)
> +{
> + struct scmi_smc *scmi_info = cinfo->transport_info;
> + struct arm_smccc_res res;
> +
> + shmem_tx_prepare(scmi_info->shmem, xfer);
How do we protect another thread/process on another CPU going and
modifying the same shmem with another request ? We may need notion
of channel with associated shmem and it is protected with some lock.
--
Regards,
Sudeep
