linux-kernel - [PATCH] iommu/amd: Add NUMA node affinity for IOMMU log buffers

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Message-ID: <20260211035839.1970-1-lirongqing@baidu.com>
Date: Tue, 10 Feb 2026 22:58:39 -0500
From: lirongqing <lirongqing@...du.com>
To: Joerg Roedel <joro@...tes.org>, Suravee Suthikulpanit
	<suravee.suthikulpanit@....com>, Will Deacon <will@...nel.org>, Robin Murphy
	<robin.murphy@....com>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>
CC: Li RongQing <lirongqing@...du.com>
Subject: [PATCH] iommu/amd: Add NUMA node affinity for IOMMU log buffers

From: Li RongQing <lirongqing@...du.com>

Currently, PPR Log and GA logs for AMD IOMMU are allocated using
iommu_alloc_pages_sz(), which does not account for NUMA affinity. This can
lead to remote memory access latencies if the memory is allocated on a
different node than the IOMMU hardware.

Switch to iommu_alloc_pages_node_sz() to ensure that these data structures
are allocated on the same NUMA node as the IOMMU device. If the node
information is unavailable, it defaults to NUMA_NO_NODE.

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 drivers/iommu/amd/init.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 384c90b..721d9d0 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -851,10 +851,11 @@ static void __init free_command_buffer(struct amd_iommu *iommu)
 void *__init iommu_alloc_4k_pages(struct amd_iommu *iommu, gfp_t gfp,
 				  size_t size)
 {
+	int nid = iommu->dev ? dev_to_node(&iommu->dev->dev) : NUMA_NO_NODE;
 	void *buf;
 
 	size = PAGE_ALIGN(size);
-	buf = iommu_alloc_pages_sz(gfp, size);
+	buf = iommu_alloc_pages_node_sz(nid, gfp, size);
 	if (!buf)
 		return NULL;
 	if (check_feature(FEATURE_SNP) &&
@@ -957,14 +958,16 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
 
 static int iommu_init_ga_log(struct amd_iommu *iommu)
 {
+	int nid = iommu->dev ? dev_to_node(&iommu->dev->dev) : NUMA_NO_NODE;
+
 	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
 		return 0;
 
-	iommu->ga_log = iommu_alloc_pages_sz(GFP_KERNEL, GA_LOG_SIZE);
+	iommu->ga_log = iommu_alloc_pages_node_sz(nid, GFP_KERNEL, GA_LOG_SIZE);
 	if (!iommu->ga_log)
 		goto err_out;
 
-	iommu->ga_log_tail = iommu_alloc_pages_sz(GFP_KERNEL, 8);
+	iommu->ga_log_tail = iommu_alloc_pages_node_sz(nid, GFP_KERNEL, 8);
 	if (!iommu->ga_log_tail)
 		goto err_out;
 
-- 
2.9.4