From: Nicolin Chen <nicolinc@nvidia.com>

Add a helper to allocate a viommu object.

Also introduce a struct IOMMUFDViommu that can be used later by vendor
IOMMU implementations.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
---
 backends/iommufd.c       | 26 ++++++++++++++++++++++++++
 backends/trace-events    |  1 +
 include/system/iommufd.h | 14 ++++++++++++++
 3 files changed, 41 insertions(+)

diff --git a/backends/iommufd.c b/backends/iommufd.c
index fdfb7c9d67..3d4a4ae736 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -446,6 +446,32 @@ bool iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t id,
     return !ret;
 }
 
+bool iommufd_backend_alloc_viommu(IOMMUFDBackend *be, uint32_t dev_id,
+                                  uint32_t viommu_type, uint32_t hwpt_id,
+                                  uint32_t *out_viommu_id, Error **errp)
+{
+    int ret;
+    struct iommu_viommu_alloc alloc_viommu = {
+        .size = sizeof(alloc_viommu),
+        .type = viommu_type,
+        .dev_id = dev_id,
+        .hwpt_id = hwpt_id,
+    };
+
+    ret = ioctl(be->fd, IOMMU_VIOMMU_ALLOC, &alloc_viommu);
+
+    trace_iommufd_backend_alloc_viommu(be->fd, dev_id, viommu_type, hwpt_id,
+                                       alloc_viommu.out_viommu_id, ret);
+    if (ret) {
+        error_setg_errno(errp, errno, "IOMMU_VIOMMU_ALLOC failed");
+        return false;
+    }
+
+    g_assert(out_viommu_id);
+    *out_viommu_id = alloc_viommu.out_viommu_id;
+    return true;
+}
+
 bool host_iommu_device_iommufd_attach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
                                            uint32_t hwpt_id, Error **errp)
 {
diff --git a/backends/trace-events b/backends/trace-events
index 56132d3fd2..01c2d9bde9 100644
--- a/backends/trace-events
+++ b/backends/trace-events
@@ -21,3 +21,4 @@ iommufd_backend_free_id(int iommufd, uint32_t id, int ret) " iommufd=%d id=%d (%
 iommufd_backend_set_dirty(int iommufd, uint32_t hwpt_id, bool start, int ret) " iommufd=%d hwpt=%u enable=%d (%d)"
 iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t iova, uint64_t size, uint64_t page_size, int ret) " iommufd=%d hwpt=%u iova=0x%"PRIx64" size=0x%"PRIx64" page_size=0x%"PRIx64" (%d)"
 iommufd_backend_invalidate_cache(int iommufd, uint32_t id, uint32_t data_type, uint32_t entry_len, uint32_t entry_num, uint32_t done_num, uint64_t data_ptr, int ret) " iommufd=%d id=%u data_type=%u entry_len=%u entry_num=%u done_num=%u data_ptr=0x%"PRIx64" (%d)"
+iommufd_backend_alloc_viommu(int iommufd, uint32_t dev_id, uint32_t type, uint32_t hwpt_id, uint32_t viommu_id, int ret) " iommufd=%d type=%u dev_id=%u hwpt_id=%u viommu_id=%u (%d)"
diff --git a/include/system/iommufd.h b/include/system/iommufd.h
index a659f36a20..11b8413c3f 100644
--- a/include/system/iommufd.h
+++ b/include/system/iommufd.h
@@ -38,6 +38,16 @@ struct IOMMUFDBackend {
     /*< public >*/
 };
 
+/*
+ * Virtual IOMMU object that represents physical IOMMU's virtualization
+ * support
+ */
+typedef struct IOMMUFDViommu {
+    IOMMUFDBackend *iommufd;
+    uint32_t s2_hwpt_id; /* ID of stage 2 HWPT */
+    uint32_t viommu_id;  /* virtual IOMMU ID of allocated object */
+} IOMMUFDViommu;
+
 bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp);
 void iommufd_backend_disconnect(IOMMUFDBackend *be);
 
@@ -59,6 +69,10 @@ bool iommufd_backend_alloc_hwpt(IOMMUFDBackend *be, uint32_t dev_id,
                                 uint32_t data_type, uint32_t data_len,
                                 void *data_ptr, uint32_t *out_hwpt,
                                 Error **errp);
+bool iommufd_backend_alloc_viommu(IOMMUFDBackend *be, uint32_t dev_id,
+                                  uint32_t viommu_type, uint32_t hwpt_id,
+                                  uint32_t *out_hwpt, Error **errp);
+
 bool iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id,
                                         bool start, Error **errp);
 bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id,
-- 
2.43.0