diff options
| author | mark gross <mgross@linux.intel.com> | 2008-03-04 15:22:08 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-04-20 21:47:07 -0700 |
| commit | 5e0d2a6fc094a9b5047998deefeb1254c66856ee (patch) | |
| tree | eb4f5bfbd1b5f937685c1f980ca83fc21c377fea /drivers/pci/iova.h | |
| parent | 0255f543d9888fb5c5fbcd265ca2eee2d6ecff6a (diff) | |
PCI: iommu: iotlb flushing
This patch is for batching up the flushing of the IOTLB for the DMAR
implementation found in the Intel VT-d hardware. It works by building a list
of to be flushed IOTLB entries and a bitmap list of which DMAR engine they are
from.
After either a high water mark (250 accessible via debugfs) or 10ms the list
of iova's will be reclaimed and the DMAR engines associated are IOTLB-flushed.
This approach recovers 15 to 20% of the performance lost when using the IOMMU
for my netperf udp stream benchmark with small packets. It can be disabled
with a kernel boot parameter "intel_iommu=strict".
Its use does weaken the IOMMU protections a bit.
Signed-off-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/iova.h')
| -rw-r--r-- | drivers/pci/iova.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/iova.h b/drivers/pci/iova.h index 228f6c94b69c..2f1317801b20 100644 --- a/drivers/pci/iova.h +++ b/drivers/pci/iova.h @@ -24,6 +24,8 @@ struct iova { struct rb_node node; unsigned long pfn_hi; /* IOMMU dish out addr hi */ unsigned long pfn_lo; /* IOMMU dish out addr lo */ + struct list_head list; + void *dmar; }; /* holds all the iova translations for a domain */ |