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authorRobin Murphy <robin.murphy@arm.com>2016-09-13 10:54:14 +0100
committerWill Deacon <will.deacon@arm.com>2016-09-16 09:34:15 +0100
commit57f98d2f61e191ef9d06863c9ce3f8621f3671ef (patch)
treefd6d52282bcada86b0893b9972eaa5b8a5f219e1 /drivers/iommu/iommu.c
parentb996444cf35e736621855e73f9d0762bd49f41f2 (diff)
iommu: Introduce iommu_fwspec
Introduce a common structure to hold the per-device firmware data that most IOMMU drivers need to keep track of. This enables us to configure much of that data from common firmware code, and consolidate a lot of the equivalent implementations, device look-up tables, etc. which are currently strewn across IOMMU drivers. This will also be enable us to address the outstanding "multiple IOMMUs on the platform bus" problem by tweaking IOMMU API calls to prefer dev->fwspec->ops before falling back to dev->bus->iommu_ops, and thus gracefully handle those troublesome systems which we currently cannot. As the first user, hook up the OF IOMMU configuration mechanism. The driver-defined nature of DT cells means that we still need the drivers to translate and add the IDs themselves, but future users such as the much less free-form ACPI IORT will be much simpler and self-contained. CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Suggested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu/iommu.c')
-rw-r--r--drivers/iommu/iommu.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b06d93594436..9a2f1960873b 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -31,6 +31,7 @@
#include <linux/err.h>
#include <linux/pci.h>
#include <linux/bitops.h>
+#include <linux/property.h>
#include <trace/events/iommu.h>
static struct kset *iommu_group_kset;
@@ -1613,3 +1614,60 @@ out:
return ret;
}
+
+int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
+ const struct iommu_ops *ops)
+{
+ struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+
+ if (fwspec)
+ return ops == fwspec->ops ? 0 : -EINVAL;
+
+ fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
+ if (!fwspec)
+ return -ENOMEM;
+
+ of_node_get(to_of_node(iommu_fwnode));
+ fwspec->iommu_fwnode = iommu_fwnode;
+ fwspec->ops = ops;
+ dev->iommu_fwspec = fwspec;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iommu_fwspec_init);
+
+void iommu_fwspec_free(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+
+ if (fwspec) {
+ fwnode_handle_put(fwspec->iommu_fwnode);
+ kfree(fwspec);
+ dev->iommu_fwspec = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(iommu_fwspec_free);
+
+int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
+{
+ struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+ size_t size;
+ int i;
+
+ if (!fwspec)
+ return -EINVAL;
+
+ size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]);
+ if (size > sizeof(*fwspec)) {
+ fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL);
+ if (!fwspec)
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < num_ids; i++)
+ fwspec->ids[fwspec->num_ids + i] = ids[i];
+
+ fwspec->num_ids += num_ids;
+ dev->iommu_fwspec = fwspec;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);