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From: jimyan <jimyan@baidu.com>
To: joro@8bytes.org
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	jimyan@baidu.com
Subject: [PATCH] iommu/vt-d: Don't reject nvme host due to scope mismatch
Date: Fri, 20 Dec 2019 15:07:54 +0800	[thread overview]
Message-ID: <1576825674-18022-1-git-send-email-jimyan@baidu.com> (raw)

On a system with an Intel PCIe port configured as a nvme host device, iommu
initialization fails with

    DMAR: Device scope type does not match for 0000:80:00.0

This is because the DMAR table reports this device as having scope 2
(ACPI_DMAR_SCOPE_TYPE_BRIDGE):

but the device has a type 0 PCI header:
80:00.0 Class 0600: Device 8086:2020 (rev 06)
00: 86 80 20 20 47 05 10 00 06 00 00 06 10 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 00 00
30: 00 00 00 00 90 00 00 00 00 00 00 00 00 01 00 00

VT-d works perfectly on this system, so there's no reason to bail out
on initialization due to this apparent scope mismatch. Add the class
0x600 ("PCI_CLASS_BRIDGE_HOST") as a heuristic for allowing DMAR
initialization for non-bridge PCI devices listed with scope bridge.

Signed-off-by: jimyan <jimyan@baidu.com>
---
 drivers/iommu/dmar.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index eecd6a421667..9faf2f0e0237 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -244,6 +244,7 @@ int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
 		     info->dev->hdr_type != PCI_HEADER_TYPE_NORMAL) ||
 		    (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE &&
 		     (info->dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
+			  info->dev->class >> 8 != PCI_CLASS_BRIDGE_HOST &&
 		      info->dev->class >> 8 != PCI_CLASS_BRIDGE_OTHER))) {
 			pr_warn("Device scope type does not match for %s\n",
 				pci_name(info->dev));
-- 
2.11.0


WARNING: multiple messages have this Message-ID (diff)
From: jimyan <jimyan@baidu.com>
To: joro@8bytes.org
Cc: jimyan@baidu.com, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] iommu/vt-d: Don't reject nvme host due to scope mismatch
Date: Fri, 20 Dec 2019 15:07:54 +0800	[thread overview]
Message-ID: <1576825674-18022-1-git-send-email-jimyan@baidu.com> (raw)

On a system with an Intel PCIe port configured as a nvme host device, iommu
initialization fails with

    DMAR: Device scope type does not match for 0000:80:00.0

This is because the DMAR table reports this device as having scope 2
(ACPI_DMAR_SCOPE_TYPE_BRIDGE):

but the device has a type 0 PCI header:
80:00.0 Class 0600: Device 8086:2020 (rev 06)
00: 86 80 20 20 47 05 10 00 06 00 00 06 10 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 00 00
30: 00 00 00 00 90 00 00 00 00 00 00 00 00 01 00 00

VT-d works perfectly on this system, so there's no reason to bail out
on initialization due to this apparent scope mismatch. Add the class
0x600 ("PCI_CLASS_BRIDGE_HOST") as a heuristic for allowing DMAR
initialization for non-bridge PCI devices listed with scope bridge.

Signed-off-by: jimyan <jimyan@baidu.com>
---
 drivers/iommu/dmar.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index eecd6a421667..9faf2f0e0237 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -244,6 +244,7 @@ int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
 		     info->dev->hdr_type != PCI_HEADER_TYPE_NORMAL) ||
 		    (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE &&
 		     (info->dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
+			  info->dev->class >> 8 != PCI_CLASS_BRIDGE_HOST &&
 		      info->dev->class >> 8 != PCI_CLASS_BRIDGE_OTHER))) {
 			pr_warn("Device scope type does not match for %s\n",
 				pci_name(info->dev));
-- 
2.11.0

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

             reply	other threads:[~2019-12-20  7:17 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-20  7:07 jimyan [this message]
2019-12-20  7:07 ` [PATCH] iommu/vt-d: Don't reject nvme host due to scope mismatch jimyan
2019-12-20  9:23 ` Jerry Snitselaar
2019-12-20  9:23   ` Jerry Snitselaar
2019-12-23  3:26   ` 答复: " Jim,Yan
2019-12-23  7:59   ` Jim,Yan
2019-12-23  7:59     ` Jim,Yan
2019-12-23 13:05     ` Lu Baolu
2019-12-23 13:05       ` Lu Baolu

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