linux-kernel - [PATCH] iommu/amd: Enable PCIe ACS once AMD IOMMU initialization succeeds

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Message-Id: <20250928065817.1279-1-guojinhui.liam@bytedance.com>
Date: Sun, 28 Sep 2025 14:58:17 +0800
From: Jinhui Guo <guojinhui.liam@...edance.com>
To: joro@...tes.org,
	suravee.suthikulpanit@....com
Cc: guojinhui.liam@...edance.com,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iommu/amd: Enable PCIe ACS once AMD IOMMU initialization succeeds

Enable PCIe ACS after the AMD IOMMU has been initialized
successfully.

Signed-off-by: Jinhui Guo <guojinhui.liam@...edance.com>
---
 drivers/iommu/amd/init.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index ba9e582a8bbe..b695efc54d5b 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -3212,9 +3212,6 @@ static bool __init detect_ivrs(void)
 	}
 
 out:
-	/* Make sure ACS will be enabled during PCI probe */
-	pci_request_acs();
-
 	return true;
 }
 
@@ -3284,6 +3281,10 @@ static int __init state_next(void)
 			ret = -EINVAL;
 		} else {
 			ret = early_amd_iommu_init();
+			if (!ret) {
+				/* Make sure ACS will be enabled during PCI probe */
+				pci_request_acs();
+			}
 			init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
 		}
 		break;
-- 
2.20.1