netdev - Re: [PATCH v14 21/22] cxl: add function for obtaining region range

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Message-ID: <aBwH3UjxOpJel_xh@aschofie-mobl2.lan>
Date: Wed, 7 May 2025 18:24:45 -0700
From: Alison Schofield <alison.schofield@...el.com>
To: <alejandro.lucero-palau@....com>
CC: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>, Alejandro Lucero <alucerop@....com>, Zhi Wang
	<zhiw@...dia.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v14 21/22] cxl: add function for obtaining region range

On Thu, Apr 17, 2025 at 10:29:24PM +0100, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> A CXL region struct contains the physical address to work with.
> 
> Add a function for getting the cxl region range to be used for mapping
> such memory range.

Worth adding that it is being exported for use by a Type 2 driver.

> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> Reviewed-by: Zhi Wang <zhiw@...dia.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
>  drivers/cxl/core/region.c | 15 +++++++++++++++
>  include/cxl/cxl.h         |  2 ++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index cec168a26efb..253ec4e384a6 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -2717,6 +2717,21 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd,
>  	return ERR_PTR(rc);
>  }
>  
> +int cxl_get_region_range(struct cxl_region *region, struct range *range)
> +{
> +	if (WARN_ON_ONCE(!region))
> +		return -ENODEV;
> +
> +	if (!region->params.res)
> +		return -ENOSPC;
> +
> +	range->start = region->params.res->start;
> +	range->end = region->params.res->end;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_NS_GPL(cxl_get_region_range, "CXL");
> +
>  static ssize_t __create_region_show(struct cxl_root_decoder *cxlrd, char *buf)
>  {
>  	return sysfs_emit(buf, "region%u\n", atomic_read(&cxlrd->region_id));
> diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
> index 5d30d775966b..2adc21e8ad44 100644
> --- a/include/cxl/cxl.h
> +++ b/include/cxl/cxl.h
> @@ -271,4 +271,6 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
>  				     bool no_dax);
>  
>  int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled);
> +struct range;
> +int cxl_get_region_range(struct cxl_region *region, struct range *range);
>  #endif /* __CXL_CXL_H__ */
> -- 
> 2.34.1
> 
>