linux-kernel - [PATCH v6 06/10] drivers,cxl: Use node-notifier instead of memory-notifier

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Message-ID: <20250609092149.312114-7-osalvador@suse.de>
Date: Mon,  9 Jun 2025 11:21:43 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Harry Yoo <harry.yoo@...cle.com>,
	Rakie Kim <rakie.kim@...com>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	Joshua Hahn <joshua.hahnjy@...il.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v6 06/10] drivers,cxl: Use node-notifier instead of memory-notifier

memory-tier is only concerned when a numa node changes its memory state,
specifically when a numa node with memory comes into play for the first
time, because it needs to get its performance attributes to build a proper
demotion chain.
So stop using the memory notifier and use the new numa node notifer
instead.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
---
 drivers/cxl/core/region.c | 16 ++++++++--------
 drivers/cxl/cxl.h         |  4 ++--
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index c3f4dc244df7..261e07302ca4 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2432,12 +2432,12 @@ static int cxl_region_perf_attrs_callback(struct notifier_block *nb,
 					  unsigned long action, void *arg)
 {
 	struct cxl_region *cxlr = container_of(nb, struct cxl_region,
-					       memory_notifier);
-	struct memory_notify *mnb = arg;
-	int nid = mnb->status_change_nid;
+					       node_notifier);
+	struct node_notify *nn = arg;
+	int nid = nn->nid;
 	int region_nid;
 
-	if (nid == NUMA_NO_NODE || action != MEM_ONLINE)
+	if (action != NODE_ADDED_FIRST_MEMORY)
 		return NOTIFY_DONE;
 
 	/*
@@ -3484,7 +3484,7 @@ static void shutdown_notifiers(void *_cxlr)
 {
 	struct cxl_region *cxlr = _cxlr;
 
-	unregister_memory_notifier(&cxlr->memory_notifier);
+	unregister_node_notifier(&cxlr->node_notifier);
 	unregister_mt_adistance_algorithm(&cxlr->adist_notifier);
 }
 
@@ -3523,9 +3523,9 @@ static int cxl_region_probe(struct device *dev)
 	if (rc)
 		return rc;
 
-	cxlr->memory_notifier.notifier_call = cxl_region_perf_attrs_callback;
-	cxlr->memory_notifier.priority = CXL_CALLBACK_PRI;
-	register_memory_notifier(&cxlr->memory_notifier);
+	cxlr->node_notifier.notifier_call = cxl_region_perf_attrs_callback;
+	cxlr->node_notifier.priority = CXL_CALLBACK_PRI;
+	register_node_notifier(&cxlr->node_notifier);
 
 	cxlr->adist_notifier.notifier_call = cxl_region_calculate_adistance;
 	cxlr->adist_notifier.priority = 100;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index a9ab46eb0610..48ac02dee881 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -513,7 +513,7 @@ enum cxl_partition_mode {
  * @flags: Region state flags
  * @params: active + config params for the region
  * @coord: QoS access coordinates for the region
- * @memory_notifier: notifier for setting the access coordinates to node
+ * @node_notifier: notifier for setting the access coordinates to node
  * @adist_notifier: notifier for calculating the abstract distance of node
  */
 struct cxl_region {
@@ -526,7 +526,7 @@ struct cxl_region {
 	unsigned long flags;
 	struct cxl_region_params params;
 	struct access_coordinate coord[ACCESS_COORDINATE_MAX];
-	struct notifier_block memory_notifier;
+	struct notifier_block node_notifier;
 	struct notifier_block adist_notifier;
 };
 
-- 
2.49.0