lkml.org 
[lkml]   [2018]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 04/10] iommu/vt-d: Get pasid table for a mediated device
Date
This patch adds the support to get the pasid table for a mediated
device. The assumption is that each mediated device is a minimal
assignable set of a physical PCI device. Hence, we should use the
pasid table of the parent PCI device to manage the translation.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-pasid.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index 1195c2a..9b4d462 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -129,7 +129,19 @@ int intel_pasid_alloc_table(struct device *dev)
int ret, order;

info = dev->archdata.iommu;
- if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table))
+ if (WARN_ON(!info || info->pasid_table))
+ return -EINVAL;
+
+ /* Use parent PCI device pasid table for mdev: */
+ if (dev_is_mdev(dev)) {
+ pasid_table = intel_pasid_get_table(dev_mdev_parent(dev));
+ if (pasid_table)
+ goto attach_out;
+ else
+ return -ENOMEM;
+ }
+
+ if (WARN_ON(!dev_is_pci(dev)))
return -EINVAL;

/* DMA alias device already has a pasid table, use it: */
@@ -190,7 +202,7 @@ void intel_pasid_free_table(struct device *dev)
int i, max_pde;

info = dev->archdata.iommu;
- if (!info || !dev_is_pci(dev) || !info->pasid_table)
+ if (!info || !info->pasid_table)
return;

pasid_table = info->pasid_table;
--
2.7.4
\
 
 \ /
  Last update: 2018-07-22 08:11    [W:0.216 / U:28.656 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site