[PATCH RFC v2 4/6] hw/arm/virt-acpi-build: Add explicit idmap info in IORT table

[Wang Xingang]

From: Xingang Wang <wangxingang5@huawei.com>

The idmap of smmuv3 and root complex covers the whole RID space for now,
this patch add explicit idmap info according to root bus number range.
This add smmuv3 idmap for certain bus which has enabled the iommu property.

Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
---
 hw/arm/virt-acpi-build.c | 103 ++++++++++++++++++++++++++++++---------
 1 file changed, 81 insertions(+), 22 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index f9c9df916c..e4a1ac3678 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -44,6 +44,7 @@
 #include "hw/acpi/tpm.h"
 #include "hw/pci/pcie_host.h"
 #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
 #include "hw/pci-host/gpex.h"
 #include "hw/arm/virt.h"
 #include "hw/mem/nvdimm.h"
@@ -237,6 +238,41 @@ static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState 
*vms)
     aml_append(scope, dev);
 }
 
+typedef
+struct AcpiIortMapping {
+    AcpiIortIdMapping idmap;
+    bool iommu;
+} AcpiIortMapping;
+
+/* For all PCI host bridges, walk and insert DMAR scope */
+static int
+iort_host_bridges(Object *obj, void *opaque)
+{
+    GArray *map_blob = opaque;
+    AcpiIortMapping map;
+    AcpiIortIdMapping *idmap = &map.idmap;
+    int bus_num, max_bus;
+
+    if (object_dynamic_cast(obj, TYPE_PCI_HOST_BRIDGE)) {
+        PCIBus *bus = PCI_HOST_BRIDGE(obj)->bus;
+
+        if (bus) {
+            bus_num = pci_bus_num(bus);
+            max_bus = pci_root_bus_max_bus(bus);
+
+            idmap->input_base = cpu_to_le32(bus_num << 8);
+            idmap->id_count = cpu_to_le32((max_bus - bus_num + 1) << 8);
+            idmap->output_base = cpu_to_le32(bus_num << 8);
+            idmap->flags = cpu_to_le32(0);
+
+            map.iommu = pci_root_bus_has_iommu(bus);
+            g_array_append_val(map_blob, map);
+        }
+    }
+
+    return 0;
+}
+
 static void
 build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
 {
@@ -247,6 +283,21 @@ build_iort(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
     AcpiIortSmmu3 *smmu;
     size_t node_size, iort_node_offset, iort_length, smmu_offset = 0;
     AcpiIortRC *rc;
+    int smmu_mapping_count;
+    GArray *map_blob = g_array_new(false, true, sizeof(AcpiIortMapping));
+    AcpiIortMapping *map;
+
+    /* pci_for_each_bus(vms->bus, insert_map, map_blob); */
+    object_child_foreach_recursive(object_get_root(),
+                                   iort_host_bridges, map_blob);
+
+    smmu_mapping_count = 0;
+    for (int i = 0; i < map_blob->len; i++) {
+        map = &g_array_index(map_blob, AcpiIortMapping, i);
+        if (map->iommu) {
+            smmu_mapping_count++;
+        }
+    }
 
     iort = acpi_data_push(table_data, sizeof(*iort));
 
@@ -280,13 +331,13 @@ build_iort(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
 
         /* SMMUv3 node */
         smmu_offset = iort_node_offset + node_size;
-        node_size = sizeof(*smmu) + sizeof(*idmap);
+        node_size = sizeof(*smmu) + sizeof(*idmap) * smmu_mapping_count;
         iort_length += node_size;
         smmu = acpi_data_push(table_data, node_size);
 
         smmu->type = ACPI_IORT_NODE_SMMU_V3;
         smmu->length = cpu_to_le16(node_size);
-        smmu->mapping_count = cpu_to_le32(1);
+        smmu->mapping_count = cpu_to_le32(smmu_mapping_count);
         smmu->mapping_offset = cpu_to_le32(sizeof(*smmu));
         smmu->base_address = cpu_to_le64(vms->memmap[VIRT_SMMU].base);
         smmu->flags = cpu_to_le32(ACPI_IORT_SMMU_V3_COHACC_OVERRIDE);
@@ -295,23 +346,28 @@ build_iort(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
         smmu->gerr_gsiv = cpu_to_le32(irq + 2);
         smmu->sync_gsiv = cpu_to_le32(irq + 3);
 
-        /* Identity RID mapping covering the whole input RID range */
-        idmap = &smmu->id_mapping_array[0];
-        idmap->input_base = 0;
-        idmap->id_count = cpu_to_le32(0xFFFF);
-        idmap->output_base = 0;
-        /* output IORT node is the ITS group node (the first node) */
-        idmap->output_reference = cpu_to_le32(iort_node_offset);
+        for (int i = 0, j = 0; i < map_blob->len; i++) {
+            map = &g_array_index(map_blob, AcpiIortMapping, i);
+
+            if (!map->iommu) {
+                continue;
+            }
+
+            idmap = &smmu->id_mapping_array[j++];
+            *idmap = map->idmap;
+            /* output IORT node is the ITS group node (the first node) */
+            idmap->output_reference = cpu_to_le32(iort_node_offset);
+        }
     }
 
     /* Root Complex Node */
-    node_size = sizeof(*rc) + sizeof(*idmap);
+    node_size = sizeof(*rc) + sizeof(*idmap) * map_blob->len;
     iort_length += node_size;
     rc = acpi_data_push(table_data, node_size);
 
     rc->type = ACPI_IORT_NODE_PCI_ROOT_COMPLEX;
     rc->length = cpu_to_le16(node_size);
-    rc->mapping_count = cpu_to_le32(1);
+    rc->mapping_count = cpu_to_le32(map_blob->len);
     rc->mapping_offset = cpu_to_le32(sizeof(*rc));
 
     /* fully coherent device */
@@ -319,20 +375,23 @@ build_iort(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
     rc->memory_properties.memory_flags = 0x3; /* CCA = CPM = DCAS = 1 */
     rc->pci_segment_number = 0; /* MCFG pci_segment */
 
-    /* Identity RID mapping covering the whole input RID range */
-    idmap = &rc->id_mapping_array[0];
-    idmap->input_base = 0;
-    idmap->id_count = cpu_to_le32(0xFFFF);
-    idmap->output_base = 0;
+    for (int i = 0; i < map_blob->len; i++) {
+        map = &g_array_index(map_blob, AcpiIortMapping, i);
+        idmap = &rc->id_mapping_array[i];
 
-    if (vms->iommu == VIRT_IOMMU_SMMUV3) {
-        /* output IORT node is the smmuv3 node */
-        idmap->output_reference = cpu_to_le32(smmu_offset);
-    } else {
-        /* output IORT node is the ITS group node (the first node) */
-        idmap->output_reference = cpu_to_le32(iort_node_offset);
+        *idmap = map->idmap;
+
+        if (vms->iommu == VIRT_IOMMU_SMMUV3 && map->iommu) {
+            /* output IORT node is the smmuv3 node */
+            idmap->output_reference = cpu_to_le32(smmu_offset);
+        } else {
+            /* output IORT node is the ITS group node (the first node) */
+            idmap->output_reference = cpu_to_le32(iort_node_offset);
+        }
     }
 
+    g_array_free(map_blob, true);
+
     /*
      * Update the pointer address in case table_data->data moves during above
      * acpi_data_push operations.
-- 
2.19.1