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From: Joerg Roedel <joro@8bytes.org>
To: iommu@lists.linux-foundation.org
Cc: Joerg Roedel <jroedel@suse.de>, Xiaojian Du <xiaojian.du@amd.com>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Huang Rui <ray.huang@amd.com>,
	Alex Deucher <alexander.deucher@amd.com>,
	David Woodhouse <dwmw2@infradead.org>
Subject: [PATCH 1/3] iommu/amd: Move Stoney Ridge check to detect_ivrs()
Date: Wed, 17 Mar 2021 10:10:35 +0100	[thread overview]
Message-ID: <20210317091037.31374-2-joro@8bytes.org> (raw)
In-Reply-To: <20210317091037.31374-1-joro@8bytes.org>

From: Joerg Roedel <jroedel@suse.de>

The AMD IOMMU will not be enabled on AMD Stoney Ridge systems. Bail
out even earlier and refuse to even detect the IOMMU there.

References: https://bugzilla.kernel.org/show_bug.cgi?id=212133
References: https://bugzilla.suse.com/show_bug.cgi?id=1183132
Cc: stable@vger.kernel.org # v5.11
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/amd/init.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 9126efcbaf2c..3280e6f5b720 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2714,7 +2714,6 @@ static int __init early_amd_iommu_init(void)
 	struct acpi_table_header *ivrs_base;
 	int i, remap_cache_sz, ret;
 	acpi_status status;
-	u32 pci_id;
 
 	if (!amd_iommu_detected)
 		return -ENODEV;
@@ -2804,16 +2803,6 @@ static int __init early_amd_iommu_init(void)
 	if (ret)
 		goto out;
 
-	/* Disable IOMMU if there's Stoney Ridge graphics */
-	for (i = 0; i < 32; i++) {
-		pci_id = read_pci_config(0, i, 0, 0);
-		if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
-			pr_info("Disable IOMMU on Stoney Ridge\n");
-			amd_iommu_disabled = true;
-			break;
-		}
-	}
-
 	/* Disable any previously enabled IOMMUs */
 	if (!is_kdump_kernel() || amd_iommu_disabled)
 		disable_iommus();
@@ -2880,6 +2869,7 @@ static bool detect_ivrs(void)
 {
 	struct acpi_table_header *ivrs_base;
 	acpi_status status;
+	int i;
 
 	status = acpi_get_table("IVRS", 0, &ivrs_base);
 	if (status == AE_NOT_FOUND)
@@ -2892,6 +2882,17 @@ static bool detect_ivrs(void)
 
 	acpi_put_table(ivrs_base);
 
+	/* Don't use IOMMU if there is Stoney Ridge graphics */
+	for (i = 0; i < 32; i++) {
+		u32 pci_id;
+
+		pci_id = read_pci_config(0, i, 0, 0);
+		if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
+			pr_info("Disable IOMMU on Stoney Ridge\n");
+			return false;
+		}
+	}
+
 	/* Make sure ACS will be enabled during PCI probe */
 	pci_request_acs();
 
-- 
2.30.2

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org, Huang Rui <ray.huang@amd.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
	Alex Deucher <alexander.deucher@amd.com>,
	Xiaojian Du <xiaojian.du@amd.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Joerg Roedel <jroedel@suse.de>,
	stable@vger.kernel.org
Subject: [PATCH 1/3] iommu/amd: Move Stoney Ridge check to detect_ivrs()
Date: Wed, 17 Mar 2021 10:10:35 +0100	[thread overview]
Message-ID: <20210317091037.31374-2-joro@8bytes.org> (raw)
In-Reply-To: <20210317091037.31374-1-joro@8bytes.org>

From: Joerg Roedel <jroedel@suse.de>

The AMD IOMMU will not be enabled on AMD Stoney Ridge systems. Bail
out even earlier and refuse to even detect the IOMMU there.

References: https://bugzilla.kernel.org/show_bug.cgi?id=212133
References: https://bugzilla.suse.com/show_bug.cgi?id=1183132
Cc: stable@vger.kernel.org # v5.11
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/amd/init.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 9126efcbaf2c..3280e6f5b720 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2714,7 +2714,6 @@ static int __init early_amd_iommu_init(void)
 	struct acpi_table_header *ivrs_base;
 	int i, remap_cache_sz, ret;
 	acpi_status status;
-	u32 pci_id;
 
 	if (!amd_iommu_detected)
 		return -ENODEV;
@@ -2804,16 +2803,6 @@ static int __init early_amd_iommu_init(void)
 	if (ret)
 		goto out;
 
-	/* Disable IOMMU if there's Stoney Ridge graphics */
-	for (i = 0; i < 32; i++) {
-		pci_id = read_pci_config(0, i, 0, 0);
-		if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
-			pr_info("Disable IOMMU on Stoney Ridge\n");
-			amd_iommu_disabled = true;
-			break;
-		}
-	}
-
 	/* Disable any previously enabled IOMMUs */
 	if (!is_kdump_kernel() || amd_iommu_disabled)
 		disable_iommus();
@@ -2880,6 +2869,7 @@ static bool detect_ivrs(void)
 {
 	struct acpi_table_header *ivrs_base;
 	acpi_status status;
+	int i;
 
 	status = acpi_get_table("IVRS", 0, &ivrs_base);
 	if (status == AE_NOT_FOUND)
@@ -2892,6 +2882,17 @@ static bool detect_ivrs(void)
 
 	acpi_put_table(ivrs_base);
 
+	/* Don't use IOMMU if there is Stoney Ridge graphics */
+	for (i = 0; i < 32; i++) {
+		u32 pci_id;
+
+		pci_id = read_pci_config(0, i, 0, 0);
+		if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
+			pr_info("Disable IOMMU on Stoney Ridge\n");
+			return false;
+		}
+	}
+
 	/* Make sure ACS will be enabled during PCI probe */
 	pci_request_acs();
 
-- 
2.30.2


  reply	other threads:[~2021-03-17  9:10 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17  9:10 [PATCH 0/3] iommu/amd: Fix booting with amd_iommu=off Joerg Roedel
2021-03-17  9:10 ` Joerg Roedel
2021-03-17  9:10 ` Joerg Roedel [this message]
2021-03-17  9:10   ` [PATCH 1/3] iommu/amd: Move Stoney Ridge check to detect_ivrs() Joerg Roedel
2021-03-17  9:10 ` [PATCH 2/3] iommu/amd: Don't call early_amd_iommu_init() when AMD IOMMU is disabled Joerg Roedel
2021-03-17  9:10   ` Joerg Roedel
2021-03-17 11:47   ` David Woodhouse
2021-03-17 11:47     ` David Woodhouse
2021-03-17 13:32     ` Joerg Roedel
2021-03-17 13:32       ` Joerg Roedel
2021-03-17 13:37       ` David Woodhouse
2021-03-17 13:37         ` David Woodhouse
2021-03-17 14:24         ` Joerg Roedel
2021-03-17 14:24           ` Joerg Roedel
2021-03-17  9:10 ` [PATCH 3/3] iommu/amd: Keep track of amd_iommu_irq_remap state Joerg Roedel
2021-03-17  9:10   ` Joerg Roedel
2021-03-17 10:48 ` [PATCH 0/3] iommu/amd: Fix booting with amd_iommu=off Huang Rui
2021-03-17 10:48   ` Huang Rui
2021-03-18  9:47   ` Joerg Roedel
2021-03-18  9:47     ` Joerg Roedel

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