ACPI/IORT: Check ATS capability in root complex nodes
Root complex node in IORT has a bit telling whether it supports ATS or
not. Store this bit in the IOMMU fwspec when setting up a device, so it
can be accessed later by an IOMMU driver. In the future we'll probably
want to store this bit at the host bridge or SMMU rather than in each
endpoint.
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index ffbbc7e..6c1b4c9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -392,10 +392,14 @@
const struct iommu_ops *ops;
struct fwnode_handle *iommu_fwnode;
void *iommu_priv;
+ u32 flags;
unsigned int num_ids;
u32 ids[1];
};
+/* ATS is supported */
+#define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
+
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);