linux-kernel - [RFC PATCH 16/20] cxl/mem: Preserve cxl root decoder during mem probe

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Message-Id: <1891546521.01750165381712.JavaMail.epsvc@epcpadp2new>
Date: Tue, 17 Jun 2025 18:09:40 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: dan.j.williams@...el.com, dave@...olabs.net,
	jonathan.cameron@...wei.com, dave.jiang@...el.com,
	alison.schofield@...el.com, vishal.l.verma@...el.com, ira.weiny@...el.com
Cc: a.manzanares@...sung.com, nifan.cxl@...il.com, anisa.su@...sung.com,
	vishak.g@...sung.com, krish.reddy@...sung.com, arun.george@...sung.com,
	alok.rathore@...sung.com, s.neeraj@...sung.com, neeraj.kernel@...il.com,
	linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
	nvdimm@...ts.linux.dev, gost.dev@...sung.com, cpgs@...sung.com
Subject: [RFC PATCH 16/20] cxl/mem: Preserve cxl root decoder during mem
 probe

Saved root decoder info is required for cxl region persistency

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/cxl/cxlmem.h | 1 +
 drivers/cxl/mem.c    | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 2a25d1957ddb..a14e82d4c9aa 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -54,6 +54,7 @@ struct cxl_memdev {
 	struct cxl_nvdimm_bridge *cxl_nvb;
 	struct cxl_nvdimm *cxl_nvd;
 	struct cxl_port *endpoint;
+	struct cxl_root_decoder *cxlrd;
 	int id;
 	int depth;
 };
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index aaea4eb178ef..c2e5d0e6b96b 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -152,6 +152,8 @@ static int cxl_mem_probe(struct device *dev)
 		return -ENXIO;
 	}
 
+	cxlmd->cxlrd = cxl_find_root_decoder(parent_port);
+
 	if (dport->rch)
 		endpoint_parent = parent_port->uport_dev;
 	else
-- 
2.34.1