linux-kernel - Re: [RFC PATCH 4/7] remoteproc: create the REMOTEPROC

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Date:   Tue, 19 Oct 2021 11:49:16 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Rob Herring <robh@...nel.org>, Christoph Hellwig <hch@....de>,
        Stefano Stabellini <stefanos@...inx.com>,
        Bruce Ashfield <bruce.ashfield@...inx.com>
Subject: Re: [RFC PATCH 4/7] remoteproc: create the REMOTEPROC_VIRTIO config

On Fri, Oct 01, 2021 at 12:12:31PM +0200, Arnaud Pouliquen wrote:
> Create the config to associate to the remoteproc virtio.
> 
> Notice that the REMOTEPROC_VIRTIO config can not set to m. the reason
> is that it defines API that is used by the built-in remote proc core.
> Functions such are rproc_add_virtio_dev can be called during the
> Linux boot phase.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> ---
>  drivers/remoteproc/Kconfig               | 11 +++++++++-
>  drivers/remoteproc/Makefile              |  2 +-
>  drivers/remoteproc/remoteproc_internal.h | 28 ++++++++++++++++++++++++
>  3 files changed, 39 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 9a6eedc3994a..f271552c0d84 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -6,7 +6,7 @@ config REMOTEPROC
>  	depends on HAS_DMA
>  	select CRC32
>  	select FW_LOADER
> -	select VIRTIO
> +	select REMOTEPROC_VIRTIO
>  	select WANT_DEV_COREDUMP
>  	help
>  	  Support for remote processors (such as DSP coprocessors). These
> @@ -14,6 +14,15 @@ config REMOTEPROC
>  
>  if REMOTEPROC
>  
> +config REMOTEPROC_VIRTIO
> +	bool "Remoteproc virtio device "
> +	select VIRTIO
> +	help
> +	  Say y here to have a virtio device support for the remoteproc
> +	  communication.
> +
> +	  It's safe to say N if you don't use the virtio for the IPC.

This one is weird but there is no need to comment further after reading your
conversation with Bjorn.

> +
>  config REMOTEPROC_CDEV
>  	bool "Remoteproc character device interface"
>  	help
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index bb26c9e4ef9c..73d2384a76aa 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -8,8 +8,8 @@ remoteproc-y				:= remoteproc_core.o
>  remoteproc-y				+= remoteproc_coredump.o
>  remoteproc-y				+= remoteproc_debugfs.o
>  remoteproc-y				+= remoteproc_sysfs.o
> -remoteproc-y				+= remoteproc_virtio.o
>  remoteproc-y				+= remoteproc_elf_loader.o
> +obj-$(CONFIG_REMOTEPROC_VIRTIO)		+= remoteproc_virtio.o
>  obj-$(CONFIG_REMOTEPROC_CDEV)		+= remoteproc_cdev.o
>  obj-$(CONFIG_IMX_REMOTEPROC)		+= imx_rproc.o
>  obj-$(CONFIG_INGENIC_VPU_RPROC)		+= ingenic_rproc.o
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index 152fe2e8668a..4ce012c353c0 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -30,10 +30,38 @@ int rproc_of_parse_firmware(struct device *dev, int index,
>  			    const char **fw_name);
>  
>  /* from remoteproc_virtio.c */
> +#if IS_ENABLED(CONFIG_REMOTEPROC_VIRTIO)
> +
>  int rproc_rvdev_add_device(struct rproc_vdev *rvdev);
>  irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
>  void rproc_vdev_release(struct kref *ref);
>  
> +#else
> +
> +int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
> +{
> +	/* This shouldn't be possible */
> +	WARN_ON(1);
> +
> +	return -ENXIO;
> +}
> +
> +static inline irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id)
> +{
> +	/* This shouldn't be possible */
> +	WARN_ON(1);
> +
> +	return IRQ_NONE;
> +}
> +
> +static inline void rproc_vdev_release(struct kref *ref)
> +{
> +	/* This shouldn't be possible */
> +	WARN_ON(1);
> +}
> +
> +#endif
> +
>  /* from remoteproc_debugfs.c */
>  void rproc_remove_trace_file(struct dentry *tfile);
>  struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
> -- 
> 2.17.1
>