linux-kernel - Re: [PATCH 2/3] cxl: Set target type of region with that of root decoder

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Message-ID: <ZqrmeC8nKVR3Tksz@aschofie-mobl2>
Date: Wed, 31 Jul 2024 18:35:52 -0700
From: Alison Schofield <alison.schofield@...el.com>
To: Huang Ying <ying.huang@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>,
	Dave Jiang <dave.jiang@...el.com>, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Alejandro Lucero <alucerop@....com>
Subject: Re: [PATCH 2/3] cxl: Set target type of region with that of root
 decoder

On Mon, Jul 29, 2024 at 04:46:10PM +0800, Ying Huang wrote:
> Now, the target type of region is hard-coded to HOSTONLYMEM, because
> only type3 expanders are supported.  To support type2 accelerators,
> set the target type of region root decoder with that of the root
> decoder.

Hi Ying,

If the target type of a region is always the same as it's root decoder,
(is it?) why do we store it as an attribute of the region. Can we look
it up when needed?

A bit more below -

> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Suggested-by: Dan Williams <dan.j.williams@...el.com>
> Cc: Davidlohr Bueso <dave@...olabs.net>
> Cc: Jonathan Cameron <jonathan.cameron@...wei.com>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Alison Schofield <alison.schofield@...el.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/cxl/core/region.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 21ad5f242875..9a483c8a32fd 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -2545,7 +2545,8 @@ static struct cxl_region *__create_region(struct cxl_root_decoder *cxlrd,
>  		return ERR_PTR(-EBUSY);
>  	}
>  
> -	return devm_cxl_add_region(cxlrd, id, mode, CXL_DECODER_HOSTONLYMEM);
> +	return devm_cxl_add_region(cxlrd, id, mode,
> +				   cxlrd->cxlsd.cxld.target_type);
>  }

Passing the 'cxlrd' and then a piece of the cxlrd (.target_type) looks
redundant.


-- Alison

>  
>  static ssize_t create_pmem_region_store(struct device *dev,
> -- 
> 2.39.2
>