Extend IOMMUFD_CMD_GET_HW_INFO op to query generic iommu capabilities for a
given device.
Capabilities are IOMMU agnostic and use device_iommu_capable() API passing
one of the IOMMU_CAP_*. Enumerate IOMMU_CAP_DIRTY_TRACKING for now in the
out_capabilities field returned back to userspace.
Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
drivers/iommu/iommufd/device.c | 4 ++++
include/uapi/linux/iommufd.h | 17 +++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index e88fa73a45e6..2a41fd2b6ef8 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -1185,6 +1185,10 @@ int iommufd_get_hw_info(struct iommufd_ucmd *ucmd)
*/
cmd->data_len = data_len;
+ cmd->out_capabilities = 0;
+ if (device_iommu_capable(idev->dev, IOMMU_CAP_DIRTY_TRACKING))
+ cmd->out_capabilities |= IOMMU_HW_CAP_DIRTY_TRACKING;
+
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
out_free:
kfree(data);
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index dce38e32ca84..036ebc6c19cf 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -418,6 +418,20 @@ enum iommu_hw_info_type {
IOMMU_HW_INFO_TYPE_INTEL_VTD,
};
+/**
+ * enum iommufd_hw_capabilities
+ * @IOMMU_HW_CAP_DIRTY_TRACKING: IOMMU hardware support for dirty tracking
+ * If available, it means the following APIs
+ * are supported:
+ *
+ * IOMMU_HWPT_GET_DIRTY_BITMAP
+ * IOMMU_HWPT_SET_DIRTY_TRACKING
+ *
+ */
+enum iommufd_hw_capabilities {
+ IOMMU_HW_CAP_DIRTY_TRACKING = 1 << 0,
+};
+
/**
* struct iommu_hw_info - ioctl(IOMMU_GET_HW_INFO)
* @size: sizeof(struct iommu_hw_info)
@@ -429,6 +443,8 @@ enum iommu_hw_info_type {
* the iommu type specific hardware information data
* @out_data_type: Output the iommu hardware info type as defined in the enum
* iommu_hw_info_type.
+ * @out_capabilities: Output the generic iommu capability info type as defined
+ * in the enum iommu_hw_capabilities.
* @__reserved: Must be 0
*
* Query an iommu type specific hardware information data from an iommu behind
@@ -453,6 +469,7 @@ struct iommu_hw_info {
__aligned_u64 data_uptr;
__u32 out_data_type;
__u32 __reserved;
+ __aligned_u64 out_capabilities;
};
#define IOMMU_GET_HW_INFO _IO(IOMMUFD_TYPE, IOMMUFD_CMD_GET_HW_INFO)
--
2.17.2
