lkml.org 
[lkml]   [2022]   [May]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] iommu/vt-d: Try info->iommu in device_to_iommu()
Date
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
\
 
 \ /
  Last update: 2022-05-13 02:34    [W:0.072 / U:2.640 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site