netdev - Re: [PATCH v18 17/20] cxl: Avoid dax creation for accelerators

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Message-ID: <437d1457-8d75-4797-8cba-9489bf97cc5d@intel.com>
Date: Fri, 19 Sep 2025 14:16:44 -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>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Davidlohr Bueso <daves@...olabs.net>
Subject: Re: [PATCH v18 17/20] cxl: Avoid dax creation for accelerators



On 9/18/25 2:17 AM, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> By definition a type2 cxl device will use the host managed memory for
> specific functionality, therefore it should not be available to other
> uses.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Davidlohr Bueso <daves@...olabs.net>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
>  drivers/cxl/core/region.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 20bd0c82806c..e39f272dd445 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -3922,6 +3922,13 @@ static int cxl_region_probe(struct device *dev)
>  	if (rc)
>  		return rc;
>  
> +	/*
> +	 * HDM-D[B] (device-memory) regions have accelerator specific usage.
> +	 * Skip device-dax registration.
> +	 */
> +	if (cxlr->type == CXL_DECODER_DEVMEM)
> +		return 0;
> +
>  	switch (cxlr->mode) {
>  	case CXL_PARTMODE_PMEM:
>  		rc = devm_cxl_region_edac_register(cxlr);