linux-kernel - Re: [PATCH 1/3] cxl: Set target type of root decoder based on CFMWS restrictions

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Message-ID: <ZqrjU+552rs7VuLy@aschofie-mobl2>
Date: Wed, 31 Jul 2024 18:22:27 -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 1/3] cxl: Set target type of root decoder based on CFMWS
 restrictions

On Mon, Jul 29, 2024 at 04:46:09PM +0800, Ying Huang wrote:
> Now, the target type of root decoder is hard-coded to HOSTONLYMEM,
> because only type3 expanders are supported.  To support type2
> accelerators, set the target type of root decoder based on the
> window restrictions field of CFMWS entry.
> 

Reviewed-by: Alison Schofield <alison.schofield@...el.com>

> 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/acpi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
> index 82b78e331d8e..40c92ad29122 100644
> --- a/drivers/cxl/acpi.c
> +++ b/drivers/cxl/acpi.c
> @@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws,
>  
>  	cxld = &cxlrd->cxlsd.cxld;
>  	cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions);
> -	cxld->target_type = CXL_DECODER_HOSTONLYMEM;
> +	if (cxld->flags & CXL_DECODER_F_TYPE2)
> +		cxld->target_type = CXL_DECODER_DEVMEM;
> +	else
> +		cxld->target_type = CXL_DECODER_HOSTONLYMEM;
>  	cxld->hpa_range = (struct range) {
>  		.start = cfmws->base_hpa,
>  		.end = cfmws->base_hpa + cfmws->window_size - 1,
> -- 
> 2.39.2
>