With the device <-> stream ID relationship suitably abstracted and
of_xlate() hooked up, the PCI dependency now looks, and is, entirely
arbitrary. Any bus using the of_dma_configure() mechanism will work,
so extend support to the platform and AMBA buses which do just that.
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
---
v4: Shorten rambling comment about why we can't share IDs
drivers/iommu/Kconfig | 2 +-
drivers/iommu/arm-smmu-v3.c | 40 ++++++++++++++++++++++++++++++++--------
2 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index ad0860383cb3..d1c66afefeed 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -308,7 +308,7 @@ config ARM_SMMU
config ARM_SMMU_V3
bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
- depends on ARM64 && PCI
+ depends on ARM64
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select GENERIC_MSI_IRQ_DOMAIN
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index fb438664b9f0..72056afdb0d7 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -35,6 +35,8 @@
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/amba/bus.h>
+
#include "io-pgtable.h"
/* MMIO registers */
@@ -1822,6 +1824,23 @@ static void arm_smmu_remove_device(struct device *dev)
iommu_fwspec_free(dev);
}
+static struct iommu_group *arm_smmu_device_group(struct device *dev)
+{
+ struct iommu_group *group;
+
+ /*
+ * We don't support devices sharing stream IDs other than PCI RID
+ * aliases, since the necessary ID-to-device lookup becomes rather
+ * impractical given a potential sparse 32-bit stream ID space.
+ */
+ if (dev_is_pci(dev))
+ group = pci_device_group(dev);
+ else
+ group = generic_device_group(dev);
+
+ return group;
+}
+
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
@@ -1868,13 +1887,8 @@ out_unlock:
static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
- int ret;
+ int ret = iommu_fwspec_init(dev, args->np);
- /* We only support PCI, for now */
- if (!dev_is_pci(dev))
- return -ENODEV;
-
- ret = iommu_fwspec_init(dev, args->np);
if (!ret)
ret = iommu_fwspec_add_ids(dev, &args->args[0], 1);
@@ -1891,7 +1905,7 @@ static struct iommu_ops arm_smmu_ops = {
.iova_to_phys = arm_smmu_iova_to_phys,
.add_device = arm_smmu_add_device,
.remove_device = arm_smmu_remove_device,
- .device_group = pci_device_group,
+ .device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
.of_xlate = arm_smmu_of_xlate,
@@ -2634,7 +2648,17 @@ static int __init arm_smmu_init(void)
if (ret)
return ret;
- return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+#ifdef CONFIG_PCI
+ ret = bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (ret)
+ return ret;
+#endif
+#ifdef CONFIG_ARM_AMBA
+ ret = bus_set_iommu(&amba_bustype, &arm_smmu_ops);
+ if (ret)
+ return ret;
+#endif
+ return bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
}
static void __exit arm_smmu_exit(void)
--
2.8.1.dirty
--
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