[Qemu-devel] [RFC PATCH 3/3] iommu: Create attach/detach group interface

[Alex Williamson]

IOMMU ops should be working at a group level rather than a device
level as we cannot arbitrarily assign devices from the same group
to different domains.  For now this is just a simple wrapper that
makes use of the dma_dev within a group.

Signed-off-by: Alex Williamson <address@hidden>
---

 drivers/iommu/iommu.c |   12 ++++++++++++
 include/linux/iommu.h |   15 +++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 6a51ed9..af77da1 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -327,6 +327,18 @@ void iommu_detach_device(struct iommu_domain *domain, 
struct device *dev)
 }
 EXPORT_SYMBOL_GPL(iommu_detach_device);
 
+int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
+{
+       return iommu_attach_device(domain, group->dma_dev);
+}
+EXPORT_SYMBOL_GPL(iommu_attach_group);
+
+void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
+{
+       iommu_detach_device(domain, group->dma_dev);
+}
+EXPORT_SYMBOL_GPL(iommu_detach_group);
+
 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
                               unsigned long iova)
 {
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 24004d6..d4e9a7a 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -107,6 +107,10 @@ extern int iommu_attach_device(struct iommu_domain *domain,
                               struct device *dev);
 extern void iommu_detach_device(struct iommu_domain *domain,
                                struct device *dev);
+extern int iommu_attach_group(struct iommu_domain *domain,
+                             struct iommu_group *group);
+extern void iommu_detach_group(struct iommu_domain *domain,
+                              struct iommu_group *group);
 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
                     phys_addr_t paddr, size_t size, int prot);
 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
@@ -194,6 +198,17 @@ static inline void iommu_detach_device(struct iommu_domain 
*domain,
 {
 }
 
+static inline int iommu_attach_group(struct iommu_domain *domain,
+                                    struct iommu_group *group)
+{
+       return -ENODEV;
+}
+
+static inline void iommu_detach_group(struct iommu_domain *domain,
+                                     struct iommu_group *group)
+{
+}
+
 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
                            phys_addr_t paddr, int gfp_order, int prot)
 {