linux-kernel - Re: [PATCH v2] cxl: core/region - ignore interleave granularity when ways=1

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Message-ID: <58522fbc-0fe8-4ecf-89f3-385f79346a10@fujitsu.com>
Date: Mon, 7 Apr 2025 08:04:43 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: Gregory Price <gourry@...rry.net>, "linux-cxl@...r.kernel.org"
	<linux-cxl@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-team@...a.com" <kernel-team@...a.com>, "dan.j.williams@...el.com"
	<dan.j.williams@...el.com>, "vishal.l.verma@...el.com"
	<vishal.l.verma@...el.com>, "dave.jiang@...el.com" <dave.jiang@...el.com>,
	"dave@...olabs.net" <dave@...olabs.net>, "jonathan.cameron@...wei.com"
	<jonathan.cameron@...wei.com>, "alison.schofield@...el.com"
	<alison.schofield@...el.com>, "ira.weiny@...el.com" <ira.weiny@...el.com>
Subject: Re: [PATCH v2] cxl: core/region - ignore interleave granularity when
 ways=1



On 03/04/2025 07:25, Gregory Price wrote:
> When validating decoder IW/IG when setting up regions, the granularity
> is irrelevant when iw=1 - all accesses will always route to the only
> target anyway - so all ig values are "correct". Loosen the requirement
> that `ig = (parent_iw * parent_ig)` when iw=1.
> 
> On some Zen5 platforms, the platform BIOS specifies a 256-byte
> interleave granularity window for host bridges when there is only
> one target downstream.  This leads to Linux rejecting the configuration
> of a region with a x2 root with two x1 hostbridges.
> 
> Decoder Programming:
>     root - iw:2 ig:256
>     hb1  - iw:1 ig:256  (Linux expects 512)
>     hb2  - iw:1 ig:256  (Linux expects 512)
>     ep1  - iw:2 ig:256
>     ep2  - iw:2 ig:256
> 
> This change allows all decoders downstream of a passthrough decoder to
> also be configured as passthrough (iw:1 ig:X), but still disallows
> downstream decoders from applying subsequent interleaves.
> 
> e.g. in the above example if there was another decoder south of hb1
> attempting to interleave 2 endpoints - Linux would enforce hb1.ig=512
> because the southern decoder would have iw:2 and require ig=pig*piw.
> 
> Signed-off-by: Gregory Price <gourry@...rry.net>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>


Tested-by: Li Zhijian <lizhijian@...itsu.com>


> ---
>   drivers/cxl/core/region.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index 04bc6cad092c..dec262eadf9a 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -1553,7 +1553,7 @@ static int cxl_port_setup_targets(struct cxl_port *port,
>   
>   	if (test_bit(CXL_REGION_F_AUTO, &cxlr->flags)) {
>   		if (cxld->interleave_ways != iw ||
> -		    cxld->interleave_granularity != ig ||
> +		    (iw > 1 && cxld->interleave_granularity != ig) ||
>   		    cxled->spa_range.start != p->res->start ||
>   		    cxled->spa_range.end != p->res->end ||
>   		    ((cxld->flags & CXL_DECODER_F_ENABLE) == 0)) {