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From: Nicolin Chen via iommu <iommu@lists.linux-foundation.org>
To: <dwmw2@infradead.org>, <baolu.lu@linux.intel.com>,
	<joro@8bytes.org>, <will@kernel.org>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	jgg@nvidia.com
Subject: [PATCH] iommu/vt-d: Try info->iommu in device_to_iommu()
Date: Thu, 12 May 2022 17:32:33 -0700	[thread overview]
Message-ID: <20220513003233.4442-1-nicolinc@nvidia.com> (raw)

Local boot test and VFIO sanity test show that info->iommu can be
used in device_to_iommu() as a fast path. So this patch adds it.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/intel/iommu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 2990f80c5e08..412fca5ab9cd 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -777,6 +777,7 @@ static bool iommu_is_dummy(struct intel_iommu *iommu, struct device *dev)
 struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
 {
 	struct dmar_drhd_unit *drhd = NULL;
+	struct device_domain_info *info;
 	struct pci_dev *pdev = NULL;
 	struct intel_iommu *iommu;
 	struct device *tmp;
@@ -786,6 +787,10 @@ struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
 	if (!dev)
 		return NULL;
 
+	info = dev_iommu_priv_get(dev);
+	if (info)
+		return info->iommu;
+
 	if (dev_is_pci(dev)) {
 		struct pci_dev *pf_pdev;
 
-- 
2.17.1

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

WARNING: multiple messages have this Message-ID (diff)
From: Nicolin Chen <nicolinc@nvidia.com>
To: <dwmw2@infradead.org>, <baolu.lu@linux.intel.com>,
	<joro@8bytes.org>, <will@kernel.org>
Cc: <jgg@nvidia.com>, <iommu@lists.linux-foundation.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH] iommu/vt-d: Try info->iommu in device_to_iommu()
Date: Thu, 12 May 2022 17:32:33 -0700	[thread overview]
Message-ID: <20220513003233.4442-1-nicolinc@nvidia.com> (raw)

Local boot test and VFIO sanity test show that info->iommu can be
used in device_to_iommu() as a fast path. So this patch adds it.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/intel/iommu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 2990f80c5e08..412fca5ab9cd 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -777,6 +777,7 @@ static bool iommu_is_dummy(struct intel_iommu *iommu, struct device *dev)
 struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
 {
 	struct dmar_drhd_unit *drhd = NULL;
+	struct device_domain_info *info;
 	struct pci_dev *pdev = NULL;
 	struct intel_iommu *iommu;
 	struct device *tmp;
@@ -786,6 +787,10 @@ struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
 	if (!dev)
 		return NULL;
 
+	info = dev_iommu_priv_get(dev);
+	if (info)
+		return info->iommu;
+
 	if (dev_is_pci(dev)) {
 		struct pci_dev *pf_pdev;
 
-- 
2.17.1


             reply	other threads:[~2022-05-13  0:33 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-13  0:32 Nicolin Chen via iommu [this message]
2022-05-13  0:32 ` [PATCH] iommu/vt-d: Try info->iommu in device_to_iommu() Nicolin Chen
2022-05-13  3:32 ` Baolu Lu
2022-05-13  3:32   ` Baolu Lu
2022-05-13  3:59   ` Nicolin Chen via iommu
2022-05-13  3:59     ` Nicolin Chen
2022-05-13 11:50   ` Jason Gunthorpe via iommu
2022-05-13 11:50     ` Jason Gunthorpe
2022-05-13 16:48     ` Nicolin Chen via iommu
2022-05-13 16:48       ` Nicolin Chen

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