linux-kernel - [PATCH v2 11/15] cxl/region: Use the endpoint's SPA range to check a region

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Message-ID: <20250218132356.1809075-12-rrichter@amd.com>
Date: Tue, 18 Feb 2025 14:23:52 +0100
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>,
	Robert Richter <rrichter@....com>
Subject: [PATCH v2 11/15] cxl/region: Use the endpoint's SPA range to check a region

Endpoints or switches requiring address translation might not be aware
of the system's interleaving configuration. Then, the configured
endpoint's address range might not match the expected range. In
contrast, the SPA range of an endpoint is calculated applying platform
specific address translation. That range is correct and can be used to
check a region range.

Adjust the region range check and use the endpoint's SPA range to
check it.

Signed-off-by: Robert Richter <rrichter@....com>
---
 drivers/cxl/core/region.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 3afcc9ca06ae..2ca24565757a 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1531,22 +1531,26 @@ 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 ||
-		    cxld->hpa_range.start != p->res->start ||
-		    cxld->hpa_range.end != p->res->end ||
+		    cxled->spa_range.start != p->res->start ||
+		    cxled->spa_range.end != p->res->end ||
 		    ((cxld->flags & CXL_DECODER_F_ENABLE) == 0)) {
 			dev_err(&cxlr->dev,
 				"%s:%s %s expected iw: %d ig: %d %pr\n",
 				dev_name(port->uport_dev), dev_name(&port->dev),
 				__func__, iw, ig, p->res);
 			dev_err(&cxlr->dev,
-				"%s:%s %s got iw: %d ig: %d state: %s %#llx:%#llx\n",
+				"%s:%s %s got iw: %d ig: %d state: %s %#llx-%#llx:%#llx-%#llx(%s):%#llx-%#llx(%s)\n",
 				dev_name(port->uport_dev), dev_name(&port->dev),
 				__func__, cxld->interleave_ways,
 				cxld->interleave_granularity,
 				(cxld->flags & CXL_DECODER_F_ENABLE) ?
 					"enabled" :
 					"disabled",
-				cxld->hpa_range.start, cxld->hpa_range.end);
+				p->res->start, p->res->end,
+				cxled->spa_range.start, cxled->spa_range.end,
+				dev_name(&cxled->cxld.dev),
+				cxld->hpa_range.start, cxld->hpa_range.end,
+				dev_name(&cxld->dev));
 			return -ENXIO;
 		}
 	} else {
-- 
2.39.5