linux-kernel - Re: [PATCH V2 1/2] remoteproc: introduce rproc features

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Date:   Fri, 11 Mar 2022 12:26:34 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     mathieu.poirier@...aro.org, arnaud.pouliquen@...s.st.com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        peng.fan@....com
Subject: Re: [PATCH V2 1/2] remoteproc: introduce rproc features

On Tue 08 Mar 00:48 CST 2022, 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 and let us optimize current code.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> 
> V2:
>  New
> 
>  include/linux/remoteproc.h | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h

This is the API that other parts of the kernel use to interact with a
struct rproc, what feature flags do you have a need for other parts of
the kernel to be able to query?

> index 93a1d0050fbc..51edaf80692c 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -417,6 +417,7 @@ struct rproc_ops {
>   *			has attached to it
>   * @RPROC_DETACHED:	device has been booted by another entity and waiting
>   *			for the core to attach to it
> + * @RPROC_CRASHED_ATTACH_RECOVERY: device has crashed and self recovery

This seems to belong in the other patch...

>   * @RPROC_LAST:		just keep this one at the end
>   *
>   * Please note that the values of these states are used as indices
> @@ -489,6 +490,11 @@ struct rproc_dump_segment {
>  	loff_t offset;
>  };
>  
> +enum rproc_features {
> +	RPROC_FEAT_ATTACH_RECOVERY = 0,

No need to specify that this is bit 0, and the enum will do that for you.

> +	RPROC_MAX_FEATURES = 32,

You're using DECLARE_BITMAP() so why 32?

Regards,
Bjorn

> +};
> +
>  /**
>   * struct rproc - represents a physical remote processor device
>   * @node: list node of this rproc object
> @@ -530,6 +536,7 @@ 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;
> @@ -570,8 +577,19 @@ struct rproc {
>  	u16 elf_machine;
>  	struct cdev cdev;
>  	bool cdev_put_on_release;
> +	DECLARE_BITMAP(features, RPROC_MAX_FEATURES);
>  };
>  
> +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)
> +{
> +	set_bit(feature, rproc->features);
> +}
> +
>  /**
>   * struct rproc_subdev - subdevice tied to a remoteproc
>   * @node: list node related to the rproc subdevs list
> -- 
> 2.30.0
>