linux-kernel - Re: [PATCH v2 04/15] cxl/region: Calculate endpoint's region position during init

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Message-ID: <Z7ZqHc44qLU73hpS@gourry-fedora-PF4VCD3F>
Date: Wed, 19 Feb 2025 18:32:45 -0500
From: Gregory Price <gourry@...rry.net>
To: Robert Richter <rrichter@....com>
Cc: Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
	Terry Bowman <terry.bowman@....com>
Subject: Re: [PATCH v2 04/15] cxl/region: Calculate endpoint's region
 position during init

On Tue, Feb 18, 2025 at 02:23:45PM +0100, Robert Richter wrote:
> The calculation of an endpoint's position in a region traverses all
> ports up to the root port and determines the corresponding decoders
> for that particular address range. For address translation the HPA
> range must be recalculated between ports. In order to prepare the
> implementation of address translation, move code to
> cxl_endpoint_decoder_initialize() and reuse the existing iterator
> there.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> ---
>  drivers/cxl/core/region.c | 25 +++++++++++++++++++++----
>  1 file changed, 21 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
> index ad4a6ce37216..6f106bfa115f 100644
> --- a/drivers/cxl/core/region.c
> +++ b/drivers/cxl/core/region.c
> @@ -1903,7 +1903,6 @@ static int cxl_region_sort_targets(struct cxl_region *cxlr)
>  	for (i = 0; i < p->nr_targets; i++) {
>  		struct cxl_endpoint_decoder *cxled = p->targets[i];
>  
> -		cxled->pos = cxl_calc_interleave_pos(cxled);
>  		/*
>  		 * Record that sorting failed, but still continue to calc
>  		 * cxled->pos so that follow-on code paths can reliably
> @@ -3264,10 +3263,22 @@ static int cxl_endpoint_decoder_initialize(struct cxl_endpoint_decoder *cxled)
>  	struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
>  	struct cxl_port *iter = cxled_to_port(cxled);
>  	struct cxl_decoder *root, *cxld = &cxled->cxld;
> -	struct range *hpa = &cxld->hpa_range;
> +	struct range hpa = cxld->hpa_range;

I believe you have a build error here:

drivers/cxl/core/region.c: In function ‘cxl_endpoint_decoder_initialize’:
drivers/cxl/core/region.c:3286:51: error: incompatible type for argument 2 of ‘cxl_port_find_switch_decoder’
 3286 |         root = cxl_port_find_switch_decoder(iter, hpa);
      |                                                   ^~~
      |                                                   |
      |                                                   struct range
drivers/cxl/core/region.c:3244:67: note: expected ‘struct range *’ but argument is of type ‘struct range’
 3244 | cxl_port_find_switch_decoder(struct cxl_port *port, struct range *hpa)
      |                                                     ~~~~~~~~~~~~~~^~~

Just a missed & later in the function

~Gregory