linux-kernel - Re: [PATCH 1/8] cxl: Add helper function to retrieve a feature entry

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Message-ID: <20250307085445.00005f5d@huawei.com>
Date: Fri, 7 Mar 2025 08:55:07 +0800
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: <shiju.jose@...wei.com>
CC: <linux-cxl@...r.kernel.org>, <dan.j.williams@...el.com>,
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Subject: Re: [PATCH 1/8] cxl: Add helper function to retrieve a feature
 entry

On Thu, 27 Feb 2025 22:38:08 +0000
<shiju.jose@...wei.com> wrote:

> From: Shiju Jose <shiju.jose@...wei.com>
> 
> Add helper function to retrieve a feature entry from the supported
> features list, if supported.
> 

I think this came from within the core cxl features series
but got pulled out due to lack of users until this set?

> Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
Either way it's a trivial and useful helper.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/cxl/core/core.h     |  2 ++
>  drivers/cxl/core/features.c | 20 ++++++++++++++++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
> index 3d3b00835446..6c83f6f18122 100644
> --- a/drivers/cxl/core/core.h
> +++ b/drivers/cxl/core/core.h
> @@ -120,6 +120,8 @@ int cxl_port_get_switch_dport_bandwidth(struct cxl_port *port,
>  int cxl_gpf_port_setup(struct device *dport_dev, struct cxl_port *port);
>  
>  #ifdef CONFIG_CXL_FEATURES
> +struct cxl_feat_entry *cxl_get_feature_entry(struct cxl_dev_state *cxlds,
> +					     const uuid_t *feat_uuid);
>  size_t cxl_get_feature(struct cxl_mailbox *cxl_mbox, const uuid_t *feat_uuid,
>  		       enum cxl_get_feat_selection selection,
>  		       void *feat_out, size_t feat_out_size, u16 offset,
> diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c
> index 048ba4fc3538..c822fb4a8c33 100644
> --- a/drivers/cxl/core/features.c
> +++ b/drivers/cxl/core/features.c
> @@ -203,6 +203,26 @@ int devm_cxl_setup_features(struct cxl_dev_state *cxlds)
>  }
>  EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_features, "CXL");
>  
> +struct cxl_feat_entry *cxl_get_feature_entry(struct cxl_dev_state *cxlds,
> +					     const uuid_t *feat_uuid)
> +{
> +	struct cxl_features_state *cxlfs = to_cxlfs(cxlds);
> +	struct cxl_feat_entry *feat_entry;
> +	int count;
> +
> +	/*
> +	 * Retrieve the feature entry from the supported features list,
> +	 * if the feature is supported.
> +	 */
> +	feat_entry = cxlfs->entries->ent;
> +	for (count = 0; count < cxlfs->entries->num_features; count++, feat_entry++) {
> +		if (uuid_equal(&feat_entry->uuid, feat_uuid))
> +			return feat_entry;
> +	}
> +
> +	return ERR_PTR(-ENOENT);
> +}
> +
>  size_t cxl_get_feature(struct cxl_mailbox *cxl_mbox, const uuid_t *feat_uuid,
>  		       enum cxl_get_feat_selection selection,
>  		       void *feat_out, size_t feat_out_size, u16 offset,