linux-kernel - Re: [PATCH 1/2] remoteproc: Add prepare and unprepare ops

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Date:   Mon, 20 Apr 2020 19:52:54 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Loic Pallardy <loic.pallardy@...com>
Subject: Re: [PATCH 1/2] remoteproc: Add prepare and unprepare ops

On Thu 16 Apr 17:20 PDT 2020, Suman Anna wrote:

> From: Loic Pallardy <loic.pallardy@...com>
> 
> On some SoC architecture, it is needed to enable HW like
> clock, bus, regulator, memory region... before loading
> co-processor firmware.
> 
> This patch introduces prepare and unprepare ops to execute
> platform specific function before firmware loading and after
> stop execution.
> 
> Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> Signed-off-by: Suman Anna <s-anna@...com>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

Do we have an inbound user of these new oops?

Regards,
Bjorn

> ---
> v1:
>  - Make the direct ops into inline helper functions in line
>    with the comments on the MCU sync series (v1 comments).
>    No change in functionality.
>  - Picked up the Reviewed-by tags
> v0: https://patchwork.kernel.org/patch/11456383/
> 
>  drivers/remoteproc/remoteproc_core.c     | 15 ++++++++++++++-
>  drivers/remoteproc/remoteproc_internal.h | 16 ++++++++++++++++
>  include/linux/remoteproc.h               |  4 ++++
>  3 files changed, 34 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index d681eeb962b6..e38f627059ac 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1394,12 +1394,19 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>  		return ret;
>  	}
>  
> +	/* Prepare rproc for firmware loading if needed */
> +	ret = rproc_prepare_device(rproc);
> +	if (ret) {
> +		dev_err(dev, "can't prepare rproc %s: %d\n", rproc->name, ret);
> +		goto disable_iommu;
> +	}
> +
>  	rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
>  
>  	/* Load resource table, core dump segment list etc from the firmware */
>  	ret = rproc_parse_fw(rproc, fw);
>  	if (ret)
> -		goto disable_iommu;
> +		goto unprepare_rproc;
>  
>  	/* reset max_notifyid */
>  	rproc->max_notifyid = -1;
> @@ -1433,6 +1440,9 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>  	kfree(rproc->cached_table);
>  	rproc->cached_table = NULL;
>  	rproc->table_ptr = NULL;
> +unprepare_rproc:
> +	/* release HW resources if needed */
> +	rproc_unprepare_device(rproc);
>  disable_iommu:
>  	rproc_disable_iommu(rproc);
>  	return ret;
> @@ -1838,6 +1848,9 @@ void rproc_shutdown(struct rproc *rproc)
>  	/* clean up all acquired resources */
>  	rproc_resource_cleanup(rproc);
>  
> +	/* release HW resources if needed */
> +	rproc_unprepare_device(rproc);
> +
>  	rproc_disable_iommu(rproc);
>  
>  	/* Free the copy of the resource table */
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index b389dc79da81..101e6be8d240 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -64,6 +64,22 @@ struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
>  struct rproc_mem_entry *
>  rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...);
>  
> +static inline int rproc_prepare_device(struct rproc *rproc)
> +{
> +	if (rproc->ops->prepare)
> +		return rproc->ops->prepare(rproc);
> +
> +	return 0;
> +}
> +
> +static inline int rproc_unprepare_device(struct rproc *rproc)
> +{
> +	if (rproc->ops->unprepare)
> +		return rproc->ops->unprepare(rproc);
> +
> +	return 0;
> +}
> +
>  static inline
>  int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
>  {
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 38607107b7cb..b8481ac969f1 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -355,6 +355,8 @@ enum rsc_handling_status {
>  
>  /**
>   * struct rproc_ops - platform-specific device handlers
> + * @prepare:	prepare device for code loading
> + * @unprepare:	unprepare device after stop
>   * @start:	power on the device and boot it
>   * @stop:	power off the device
>   * @kick:	kick a virtqueue (virtqueue id given as a parameter)
> @@ -373,6 +375,8 @@ enum rsc_handling_status {
>   *		panic at least the returned number of milliseconds
>   */
>  struct rproc_ops {
> +	int (*prepare)(struct rproc *rproc);
> +	int (*unprepare)(struct rproc *rproc);
>  	int (*start)(struct rproc *rproc);
>  	int (*stop)(struct rproc *rproc);
>  	void (*kick)(struct rproc *rproc, int vqid);
> -- 
> 2.26.0
>