From f060db99374e80e853ac4916b49f0a903f65e9dc Mon Sep 17 00:00:00 2001
From: Jia He <justin.he@arm.com>
Date: Wed, 22 Sep 2021 23:29:19 +0800
Subject: [PATCH] ACPI: NFIT: Use fallback node id when numa info in NFIT table is incorrect
Git-commit: f060db99374e80e853ac4916b49f0a903f65e9dc
Patch-mainline: v5.15-rc4
References: git-fixes stable-5.14.10

When ACPI NFIT table is failing to populate correct numa information
on arm64, dax_kmem will get NUMA_NO_NODE from the NFIT driver.

Without this patch, pmem can't be probed as RAM devices on arm64 guest:
  $ndctl create-namespace -fe namespace0.0 --mode=devdax --map=dev -s 1g -a 128M
  kmem dax0.0: rejecting DAX region [mem 0x240400000-0x2bfffffff] with invalid node: -1
  kmem: probe of dax0.0 failed with error -22

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jia He <justin.he@arm.com>
Cc: <stable@vger.kernel.org>
Fixes: c221c0b0308f ("device-dax: "Hotplug" persistent memory for use like normal RAM")
Link: https://lore.kernel.org/r/20210922152919.6940-1-justin.he@arm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/acpi/nfit/core.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index a3ef6cce644c..7dd80acf92c7 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -3007,6 +3007,18 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
 		ndr_desc->target_node = NUMA_NO_NODE;
 	}
 
+	/* Fallback to address based numa information if node lookup failed */
+	if (ndr_desc->numa_node == NUMA_NO_NODE) {
+		ndr_desc->numa_node = memory_add_physaddr_to_nid(spa->address);
+		dev_info(acpi_desc->dev, "changing numa node from %d to %d for nfit region [%pa-%pa]",
+			NUMA_NO_NODE, ndr_desc->numa_node, &res.start, &res.end);
+	}
+	if (ndr_desc->target_node == NUMA_NO_NODE) {
+		ndr_desc->target_node = phys_to_target_node(spa->address);
+		dev_info(acpi_desc->dev, "changing target node from %d to %d for nfit region [%pa-%pa]",
+			NUMA_NO_NODE, ndr_desc->numa_node, &res.start, &res.end);
+	}
+
 	/*
 	 * Persistence domain bits are hierarchical, if
 	 * ACPI_NFIT_CAPABILITY_CACHE_FLUSH is set then
-- 
2.26.2