linux-kernel - [PATCH] iommu/vt-d: Allocate local memory for page request queue

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Date: Wed,  3 Apr 2024 14:40:07 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: LKML <linux-kernel@...r.kernel.org>,
	iommu@...ts.linux.dev,
	"Lu Baolu" <baolu.lu@...ux.intel.com>,
	Joerg Roedel <joro@...tes.org>
Cc: Raj Ashok <ashok.raj@...el.com>,
	"Tian, Kevin" <kevin.tian@...el.com>,
	Yi Liu <yi.l.liu@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH] iommu/vt-d: Allocate local memory for page request queue

The page request queue is per IOMMU, its allocation should be made
NUMA-aware for performance reasons.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel/svm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index c1bed89b1026..ee3b469e2da1 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -66,7 +66,7 @@ int intel_svm_enable_prq(struct intel_iommu *iommu)
 	struct page *pages;
 	int irq, ret;
 
-	pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, PRQ_ORDER);
+	pages = alloc_pages_node(iommu->node, GFP_KERNEL | __GFP_ZERO, PRQ_ORDER);
 	if (!pages) {
 		pr_warn("IOMMU: %s: Failed to allocate page request queue\n",
 			iommu->name);
-- 
2.25.1