netdev - Re: [PATCH v12 21/23] cxl: add function for obtaining region range

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Message-ID: <54660950-979c-45d6-8beb-22117b3ba610@intel.com>
Date: Fri, 11 Apr 2025 16:32:09 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: alejandro.lucero-palau@....com, 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
Cc: Alejandro Lucero <alucerop@....com>, Zhi Wang <zhiw@...dia.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v12 21/23] cxl: add function for obtaining region range



On 3/31/25 7:45 AM, 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.
Consider replace the commit log with:
Add a helper function to retrieve the physical address range of a CXL region for mapping.


> 
> 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 58b68baf2bf3..12aa5bd346ca 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -2716,6 +2716,21 @@ 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 2bb495f78239..23f467ed2f2e 100644
> --- a/include/cxl/cxl.h
> +++ b/include/cxl/cxl.h
> @@ -266,4 +266,6 @@ 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