[PATCH v14 02/11] virtio-iommu: Decode the command payload

[Eric Auger <eric.auger@redhat.com>]

This patch adds the command payload decoding and
introduces the functions that will do the actual
command handling. Those functions are not yet implemented.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>

---

v11 -> v12:
- ADded Jean and Peter's R-b

v10 -> v11:
- use a macro for handle command functions

v9 -> v10:
- make virtio_iommu_handle_* more compact and
  remove get_payload_size

v7 -> v8:
- handle new domain parameter in detach
- remove reserved checks

v5 -> v6:
- change map/unmap semantics (remove size)

v4 -> v5:
- adopt new v0.5 terminology

v3 -> v4:
- no flags field anymore in struct virtio_iommu_req_unmap
- test reserved on attach/detach, change trace proto
- rebase on v2.10.0.
---
 hw/virtio/trace-events   |  4 +++
 hw/virtio/virtio-iommu.c | 76 +++++++++++++++++++++++++++++++++-------
 2 files changed, 68 insertions(+), 12 deletions(-)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 02d93d7f63..f7141aa2f6 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -60,3 +60,7 @@ virtio_iommu_get_features(uint64_t features) "device supports features=0x%"PRIx6
 virtio_iommu_device_status(uint8_t status) "driver status = %d"
 virtio_iommu_get_config(uint64_t page_size_mask, uint64_t start, uint64_t end, uint32_t domain_range, uint32_t probe_size) "page_size_mask=0x%"PRIx64" start=0x%"PRIx64" end=0x%"PRIx64" domain_range=%d probe_size=0x%x"
 virtio_iommu_set_config(uint64_t page_size_mask, uint64_t start, uint64_t end, uint32_t domain_range, uint32_t probe_size) "page_size_mask=0x%"PRIx64" start=0x%"PRIx64" end=0x%"PRIx64" domain_bits=%d probe_size=0x%x"
+virtio_iommu_attach(uint32_t domain_id, uint32_t ep_id) "domain=%d endpoint=%d"
+virtio_iommu_detach(uint32_t domain_id, uint32_t ep_id) "domain=%d endpoint=%d"
+virtio_iommu_map(uint32_t domain_id, uint64_t virt_start, uint64_t virt_end, uint64_t phys_start, uint32_t flags) "domain=%d virt_start=0x%"PRIx64" virt_end=0x%"PRIx64 " phys_start=0x%"PRIx64" flags=%d"
+virtio_iommu_unmap(uint32_t domain_id, uint64_t virt_start, uint64_t virt_end) "domain=%d virt_start=0x%"PRIx64" virt_end=0x%"PRIx64
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 30579267d5..86dcdc09a1 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -34,31 +34,83 @@
 /* Max size */
 #define VIOMMU_DEFAULT_QUEUE_SIZE 256
 
-static int virtio_iommu_handle_attach(VirtIOIOMMU *s,
-                                      struct iovec *iov,
-                                      unsigned int iov_cnt)
+static int virtio_iommu_attach(VirtIOIOMMU *s,
+                               struct virtio_iommu_req_attach *req)
 {
+    uint32_t domain_id = le32_to_cpu(req->domain);
+    uint32_t ep_id = le32_to_cpu(req->endpoint);
+
+    trace_virtio_iommu_attach(domain_id, ep_id);
+
     return VIRTIO_IOMMU_S_UNSUPP;
 }
-static int virtio_iommu_handle_detach(VirtIOIOMMU *s,
-                                      struct iovec *iov,
-                                      unsigned int iov_cnt)
+
+static int virtio_iommu_detach(VirtIOIOMMU *s,
+                               struct virtio_iommu_req_detach *req)
 {
+    uint32_t domain_id = le32_to_cpu(req->domain);
+    uint32_t ep_id = le32_to_cpu(req->endpoint);
+
+    trace_virtio_iommu_detach(domain_id, ep_id);
+
     return VIRTIO_IOMMU_S_UNSUPP;
 }
-static int virtio_iommu_handle_map(VirtIOIOMMU *s,
-                                   struct iovec *iov,
-                                   unsigned int iov_cnt)
+
+static int virtio_iommu_map(VirtIOIOMMU *s,
+                            struct virtio_iommu_req_map *req)
 {
+    uint32_t domain_id = le32_to_cpu(req->domain);
+    uint64_t phys_start = le64_to_cpu(req->phys_start);
+    uint64_t virt_start = le64_to_cpu(req->virt_start);
+    uint64_t virt_end = le64_to_cpu(req->virt_end);
+    uint32_t flags = le32_to_cpu(req->flags);
+
+    trace_virtio_iommu_map(domain_id, virt_start, virt_end, phys_start, flags);
+
     return VIRTIO_IOMMU_S_UNSUPP;
 }
-static int virtio_iommu_handle_unmap(VirtIOIOMMU *s,
-                                     struct iovec *iov,
-                                     unsigned int iov_cnt)
+
+static int virtio_iommu_unmap(VirtIOIOMMU *s,
+                              struct virtio_iommu_req_unmap *req)
 {
+    uint32_t domain_id = le32_to_cpu(req->domain);
+    uint64_t virt_start = le64_to_cpu(req->virt_start);
+    uint64_t virt_end = le64_to_cpu(req->virt_end);
+
+    trace_virtio_iommu_unmap(domain_id, virt_start, virt_end);
+
     return VIRTIO_IOMMU_S_UNSUPP;
 }
 
+static int virtio_iommu_iov_to_req(struct iovec *iov,
+                                   unsigned int iov_cnt,
+                                   void *req, size_t req_sz)
+{
+    size_t sz, payload_sz = req_sz - sizeof(struct virtio_iommu_req_tail);
+
+    sz = iov_to_buf(iov, iov_cnt, 0, req, payload_sz);
+    if (unlikely(sz != payload_sz)) {
+        return VIRTIO_IOMMU_S_INVAL;
+    }
+    return 0;
+}
+
+#define virtio_iommu_handle_req(__req)                                  \
+static int virtio_iommu_handle_ ## __req(VirtIOIOMMU *s,                \
+                                         struct iovec *iov,             \
+                                         unsigned int iov_cnt)          \
+{                                                                       \
+    struct virtio_iommu_req_ ## __req req;                              \
+    int ret = virtio_iommu_iov_to_req(iov, iov_cnt, &req, sizeof(req)); \
+                                                                        \
+    return ret ? ret : virtio_iommu_ ## __req(s, &req);                 \
+}
+
+virtio_iommu_handle_req(attach)
+virtio_iommu_handle_req(detach)
+virtio_iommu_handle_req(map)
+virtio_iommu_handle_req(unmap)
+
 static void virtio_iommu_handle_command(VirtIODevice *vdev, VirtQueue *vq)
 {
     VirtIOIOMMU *s = VIRTIO_IOMMU(vdev);
-- 
2.20.1