[RFC PATCH v5 03/11] VFIO_IOMMU_TYPE1 for platform bus devices on ARM

[Antonios Motakis <a.motakis@virtualopensystems.com>]

This allows to make use of the VFIO_IOMMU_TYPE1 driver with platform
devices on ARM in addition to PCI. This is required in order to use the
Exynos SMMU, or ARM SMMU driver with VFIO_IOMMU_TYPE1.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
---
 drivers/vfio/Kconfig            | 2 +-
 drivers/vfio/vfio_iommu_type1.c | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index af7b204..3a598ed 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -11,7 +11,7 @@ config VFIO_IOMMU_SPAPR_TCE
 menuconfig VFIO
 	tristate "VFIO Non-Privileged userspace driver framework"
 	depends on IOMMU_API
-	select VFIO_IOMMU_TYPE1 if X86
+	select VFIO_IOMMU_TYPE1 if X86 || ARM
 	select VFIO_IOMMU_SPAPR_TCE if (PPC_POWERNV || PPC_PSERIES)
 	select ANON_INODES
 	help
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 1f90344..4dc989d 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -30,6 +30,7 @@
 #include <linux/iommu.h>
 #include <linux/module.h>
 #include <linux/mm.h>
+#include <linux/pci.h>		/* pci_bus_type */
 #include <linux/rbtree.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
@@ -721,13 +722,15 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
 	INIT_LIST_HEAD(&domain->group_list);
 	list_add(&group->next, &domain->group_list);
 
-	if (!allow_unsafe_interrupts &&
+#ifdef CONFIG_PCI
+	if (bus == &pci_bus_type && !allow_unsafe_interrupts &&
 	    !iommu_domain_has_cap(domain->domain, IOMMU_CAP_INTR_REMAP)) {
 		pr_warn("%s: No interrupt remapping support.  Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
 		       __func__);
 		ret = -EPERM;
 		goto out_detach;
 	}
+#endif
 
 	if (iommu_domain_has_cap(domain->domain, IOMMU_CAP_CACHE_COHERENCY))
 		domain->prot |= IOMMU_CACHE;
-- 
1.8.3.2