netdev - Re: [PATCH v2 14/15] cxl: add function for obtaining params from a region

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Message-ID: <20240809182420.00002f9e.zhiw@nvidia.com>
Date: Fri, 9 Aug 2024 18:24:20 +0300
From: Zhi Wang <zhiw@...dia.com>
To: <alejandro.lucero-palau@....com>
CC: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>, <richard.hughes@....com>,
	Alejandro Lucero <alucerop@....com>, <targupta@...dia.com>
Subject: Re: [PATCH v2 14/15] cxl: add function for obtaining params from a
 region

On Mon, 15 Jul 2024 18:28:34 +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 given a opaque cxl region struct returns the params
> to be used for mapping such memory range.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/cxl/core/region.c     | 16 ++++++++++++++++
>  drivers/cxl/cxl.h             |  3 +++
>  include/linux/cxl_accel_mem.h |  2 ++
>  3 files changed, 21 insertions(+)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index c8fc14ac437e..9ff10923e9fc 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -3345,6 +3345,22 @@ static int devm_cxl_add_dax_region(struct
> cxl_region *cxlr) return rc;
>  }
>  
> +int cxl_accel_get_region_params(struct cxl_region *region,
> +				resource_size_t *start,
> resource_size_t *end) +{
> +	if (!region)
> +		return -ENODEV;
> +
> +	if (!region->params.res) {
> +		return -ENODEV;
> +	}

Remove the extra {}

> +	*start = region->params.res->start;
> +	*end = region->params.res->end;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_NS_GPL(cxl_accel_get_region_params, CXL);
> +
>  static int match_root_decoder_by_range(struct device *dev, void
> *data) {
>  	struct range *r1, *r2 = data;
> diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
> index 1bf3b74ff959..b4c4c4455ef1 100644
> --- a/drivers/cxl/cxl.h
> +++ b/drivers/cxl/cxl.h
> @@ -906,6 +906,9 @@ void cxl_coordinates_combine(struct
> access_coordinate *out, bool
> cxl_endpoint_decoder_reset_detected(struct cxl_port *port); 
>  int cxl_region_detach(struct cxl_endpoint_decoder *cxled);
> +
> +int cxl_accel_get_region_params(struct cxl_region *region,
> +				resource_size_t *start,
> resource_size_t *end); /*
>   * Unit test builds overrides this to __weak, find the 'strong'
> version
>   * of these symbols in tools/testing/cxl/.
> diff --git a/include/linux/cxl_accel_mem.h
> b/include/linux/cxl_accel_mem.h index a5f9ffc24509..5d715eea6e91
> 100644 --- a/include/linux/cxl_accel_mem.h
> +++ b/include/linux/cxl_accel_mem.h
> @@ -53,4 +53,6 @@ struct cxl_region *cxl_create_region(struct
> cxl_root_decoder *cxlrd, int ways);
>  
>  int cxl_region_detach(struct cxl_endpoint_decoder *cxled);
> +int cxl_accel_get_region_params(struct cxl_region *region,
> +				resource_size_t *start,
> resource_size_t *end); #endif