linux-kernel - Re: [PATCH 1/3] rpmsg: core: export rpmsg bus type

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Date:   Fri, 2 Mar 2018 15:25:27 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     srinivas.kandagatla@...aro.org, will.deacon@....com,
        bjorn.andersson@...aro.org
Cc:     joro@...tes.org, ohad@...ery.com,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 1/3] rpmsg: core: export rpmsg bus type

On 02/03/18 14:55, srinivas.kandagatla@...aro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> Export rpmsg bus type so that iommu drivers iommu ops to
> rpmsg bus type.
> 
> On Qualcomm SoCs ADSP exposes functions like audio and
> other which need iommu access, as these drivers are part
> of rpmsg bus, able to allocate memory from iommus is basic
> requirement. So expose this bus so that iommu drivers can
> add ops to this.

IOMMU drivers are built-in while rpmsg can be built as a module, so that 
isn't always going to work.

Robin.

> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>   drivers/rpmsg/rpmsg_core.c | 3 ++-
>   include/linux/rpmsg.h      | 2 +-
>   2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index 5a081762afcc..e84c71f8d6ab 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -465,7 +465,7 @@ static int rpmsg_dev_remove(struct device *dev)
>   	return err;
>   }
>   
> -static struct bus_type rpmsg_bus = {
> +struct bus_type rpmsg_bus = {
>   	.name		= "rpmsg",
>   	.match		= rpmsg_dev_match,
>   	.dev_groups	= rpmsg_dev_groups,
> @@ -473,6 +473,7 @@ static struct bus_type rpmsg_bus = {
>   	.probe		= rpmsg_dev_probe,
>   	.remove		= rpmsg_dev_remove,
>   };
> +EXPORT_SYMBOL(rpmsg_bus);
>   
>   int rpmsg_register_device(struct rpmsg_device *rpdev)
>   {
> diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
> index ca07366c4c33..869e5946b7df 100644
> --- a/include/linux/rpmsg.h
> +++ b/include/linux/rpmsg.h
> @@ -49,7 +49,7 @@ struct rpmsg_device;
>   struct rpmsg_endpoint;
>   struct rpmsg_device_ops;
>   struct rpmsg_endpoint_ops;
> -
> +extern struct bus_type rpmsg_bus;
>   /**
>    * struct rpmsg_channel_info - channel info representation
>    * @name: name of service
>