linux-kernel - [PATCH 3/4] ACPI/MRRM: Add "node" symlink to /sys/devices/system/memory/rangeX

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Message-ID: <20250210211223.6139-4-tony.luck@intel.com>
Date: Mon, 10 Feb 2025 13:12:22 -0800
From: Tony Luck <tony.luck@...el.com>
To: Robert Moore <robert.moore@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	David Hildenbrand <david@...hat.com>,
	Oscar Salvador <osalvador@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 3/4] ACPI/MRRM: Add "node" symlink to /sys/devices/system/memory/rangeX

Users will likely want to know which node owns each memory range
and which CPUs are local to the range.

Add a symlink to the node directory to provide both pieces of information.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 drivers/acpi/acpi_mrrm.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/acpi/acpi_mrrm.c b/drivers/acpi/acpi_mrrm.c
index 51ed9064e025..28b484943bbd 100644
--- a/drivers/acpi/acpi_mrrm.c
+++ b/drivers/acpi/acpi_mrrm.c
@@ -119,6 +119,31 @@ static struct attribute *memory_range_attrs[] = {
 
 ATTRIBUTE_GROUPS(memory_range);
 
+static __init int add_node_link(struct mrrm_mem_range_entry *entry)
+{
+	struct node *node = NULL;
+	int ret = 0;
+	int nid;
+
+	for_each_online_node(nid) {
+		for (int z = 0; z < MAX_NR_ZONES; z++) {
+			struct zone *zone = NODE_DATA(nid)->node_zones + z;
+
+			if (!populated_zone(zone))
+				continue;
+			if (zone_intersects(zone, PHYS_PFN(entry->base), PHYS_PFN(entry->length))) {
+				node = node_devices[zone->node];
+				goto found;
+			}
+		}
+	}
+found:
+	if (node)
+		ret = sysfs_create_link(&entry->dev.kobj, &node->dev.kobj, "node");
+
+	return ret;
+}
+
 static __init int add_boot_memory_ranges(void)
 {
 	char name[16];
@@ -140,6 +165,10 @@ static __init int add_boot_memory_ranges(void)
 			put_device(&entry->dev);
 			return ret;
 		}
+
+		ret = add_node_link(entry);
+		if (ret)
+			break;
 	}
 
 	return ret;
-- 
2.48.1