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authorAlex Williamson <alex.williamson@redhat.com>2014-02-26 11:38:37 -0700
committerAlex Williamson <alex.williamson@redhat.com>2014-02-26 11:38:37 -0700
commitaa429318279b90192f35a97e9ccdc1e83b3a9624 (patch)
treeb27ec47dd53413e02c81376f80c10fd57ba4a334 /drivers/vfio
parent1ef3e2bc04223ff956dc62abaf2dff1f3322a431 (diff)
downloadlinux-aa429318279b90192f35a97e9ccdc1e83b3a9624.tar.bz2
vfio/type1: Add extension to test DMA cache coherence of IOMMU
Now that the type1 IOMMU backend can support IOMMU_CACHE, we need to be able to test whether coherency is currently enforced. Add an extension for this. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_type1.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 8c7bb9befdab..1f90344d3e2c 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -867,6 +867,23 @@ static void vfio_iommu_type1_release(void *iommu_data)
kfree(iommu);
}
+static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
+{
+ struct vfio_domain *domain;
+ int ret = 1;
+
+ mutex_lock(&iommu->lock);
+ list_for_each_entry(domain, &iommu->domain_list, next) {
+ if (!(domain->prot & IOMMU_CACHE)) {
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&iommu->lock);
+
+ return ret;
+}
+
static long vfio_iommu_type1_ioctl(void *iommu_data,
unsigned int cmd, unsigned long arg)
{
@@ -878,6 +895,10 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
case VFIO_TYPE1_IOMMU:
case VFIO_TYPE1v2_IOMMU:
return 1;
+ case VFIO_DMA_CC_IOMMU:
+ if (!iommu)
+ return 0;
+ return vfio_domains_have_iommu_cache(iommu);
default:
return 0;
}