linux-kernel - [PATCH v3 05/11] cxl/region: Add @range argument to function cxl_calc_interleave

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Message-ID: <20250912144514.526441-6-rrichter@amd.com>
Date: Fri, 12 Sep 2025 16:45:07 +0200
From: Robert Richter <rrichter@....com>
To: 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>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Gregory Price
	<gourry@...rry.net>, "Fabio M. De Francesco"
	<fabio.m.de.francesco@...ux.intel.com>, Terry Bowman <terry.bowman@....com>,
	Joshua Hahn <joshua.hahnjy@...il.com>, Robert Richter <rrichter@....com>
Subject: [PATCH v3 05/11] cxl/region: Add @range argument to function cxl_calc_interleave_pos()

cxl_calc_interleave_pos() uses the endpoint decoder's HPA range to
determine its interleaving position. This requires the endpoint
decoders to be an SPA, which is not the case for systems that need
address translation.

Add a separate @range argument to function cxl_calc_interleave_pos()
to specify the address range. Now it is possible to pass the SPA
translated address range of an endpoint decoder to function
cxl_calc_interleave_pos().

Patch is a prerequisite to implement address translation.

Signed-off-by: Robert Richter <rrichter@....com>
---
 drivers/cxl/core/region.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 8ccc171ac724..106692f1e310 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1844,11 +1844,11 @@ static int find_pos_and_ways(struct cxl_port *port, struct range *range,
  * Return: position >= 0 on success
  *	   -ENXIO on failure
  */
-static int cxl_calc_interleave_pos(struct cxl_endpoint_decoder *cxled)
+static int cxl_calc_interleave_pos(struct cxl_endpoint_decoder *cxled,
+				   struct range *range)
 {
 	struct cxl_port *iter, *port = cxled_to_port(cxled);
 	struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
-	struct range *range = &cxled->cxld.hpa_range;
 	int parent_ways = 0, parent_pos = 0, pos = 0;
 	int rc;
 
@@ -1909,7 +1909,7 @@ 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);
+		cxled->pos = cxl_calc_interleave_pos(cxled, &cxlr->hpa_range);
 		/*
 		 * Record that sorting failed, but still continue to calc
 		 * cxled->pos so that follow-on code paths can reliably
@@ -2093,7 +2093,7 @@ static int cxl_region_attach(struct cxl_region *cxlr,
 		struct cxl_endpoint_decoder *cxled = p->targets[i];
 		int test_pos;
 
-		test_pos = cxl_calc_interleave_pos(cxled);
+		test_pos = cxl_calc_interleave_pos(cxled, &cxlr->hpa_range);
 		dev_dbg(&cxled->cxld.dev,
 			"Test cxl_calc_interleave_pos(): %s test_pos:%d cxled->pos:%d\n",
 			(test_pos == cxled->pos) ? "success" : "fail",
-- 
2.39.5