linux-kernel - Re: [PATCH V4 1/2] remoteproc: introduce rproc features

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Date:   Mon, 30 May 2022 11:17:28 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     bjorn.andersson@...aro.org, arnaud.pouliquen@...s.st.com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        peng.fan@....com
Subject: Re: [PATCH V4 1/2] remoteproc: introduce rproc features

Hi Peng,

On Wed, Mar 23, 2022 at 11:44:04AM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> remote processor may support:
>  - firmware recovery with help from main processor
>  - self recovery without help from main processor
>  - iommu
>  - etc
> 
> Introduce rproc features could simplify code to avoid adding more bool
> flags
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/remoteproc_internal.h | 10 ++++++++++
>  include/linux/remoteproc.h               |  7 +++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index 72d4d3d7d94d..e9ae743c5587 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -24,6 +24,16 @@ struct rproc_debug_trace {
>  	struct rproc_mem_entry trace_mem;
>  };
>  
> +static inline bool rproc_has_feature(struct rproc *rproc, unsigned int feature)
> +{
> +	return test_bit(feature, rproc->features);
> +}
> +
> +static inline void rproc_set_feature(struct rproc *rproc, unsigned int feature)
> +{

I would expect this function to return -EINVAL if feature is >
RPROC_MAX_FEATURES.

> +	set_bit(feature, rproc->features);
> +}
> +
>  /* from remoteproc_core.c */
>  void rproc_release(struct kref *kref);
>  irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 7c943f0a2fc4..7847c6b10a69 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -489,6 +489,11 @@ struct rproc_dump_segment {
>  	loff_t offset;
>  };
> 

Please add proper kernel documentation.

> +enum rproc_features {
> +	RPROC_FEAT_ATTACH_RECOVERY,

s/RPROC_FEAT_ATTACH_RECOVERY/RPROC_FEAT_ATTACH_ON_RECOVERY

> +	RPROC_MAX_FEATURES,
> +};
> +
>  /**
>   * struct rproc - represents a physical remote processor device
>   * @node: list node of this rproc object
> @@ -530,6 +535,7 @@ struct rproc_dump_segment {
>   * @elf_machine: firmware ELF machine
>   * @cdev: character device of the rproc
>   * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
> + * @features: indicate remoteproc features
>   */
>  struct rproc {
>  	struct list_head node;
> @@ -570,6 +576,7 @@ struct rproc {
>  	u16 elf_machine;
>  	struct cdev cdev;
>  	bool cdev_put_on_release;
> +	DECLARE_BITMAP(features, RPROC_MAX_FEATURES);
>  };
>  
>  /**
> -- 
> 2.25.1
>