[Qemu-devel] [RFC v4 10/16] hw/arm/boot: Expose the PC-DIMM nodes in the DT

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

From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>

This patch add memory nodes corresponding to PC-DIMM regions.

NV_DIMM and ACPI_NVDIMM configs are not yet set for ARM so we
don't need to care about NV-DIMM at this stage.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v3 -> v4:
- git rid of @base and @len in fdt_add_hotpluggable_memory_nodes

v1 -> v2:
- added qapi_free_MemoryDeviceInfoList and simplify the loop
---
 hw/arm/boot.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index ba2004da5c..81d621ce14 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -19,6 +19,7 @@
 #include "sysemu/numa.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
+#include "hw/mem/memory-device.h"
 #include "elf.h"
 #include "sysemu/device_tree.h"
 #include "qemu/config-file.h"
@@ -516,6 +517,34 @@ static void fdt_add_psci_node(void *fdt)
     qemu_fdt_setprop_cell(fdt, "/psci", "migrate", migrate_fn);
 }
 
+static int fdt_add_hotpluggable_memory_nodes(void *fdt,
+                                             uint32_t acells, uint32_t scells) {
+    MemoryDeviceInfoList *info, *info_list = qmp_memory_device_list();
+    MemoryDeviceInfo *mi;
+    PCDIMMDeviceInfo *di;
+    bool is_nvdimm;
+    int ret = 0;
+
+    for (info = info_list; info != NULL; info = info->next) {
+        mi = info->value;
+        is_nvdimm = (mi->type == MEMORY_DEVICE_INFO_KIND_NVDIMM);
+        di = !is_nvdimm ? mi->u.dimm.data : mi->u.nvdimm.data;
+
+        if (is_nvdimm) {
+            ret = -ENOENT; /* NV-DIMM not yet supported */
+        } else {
+            ret = fdt_add_memory_node(fdt, acells, di->addr,
+                                      scells, di->size, di->node);
+        }
+        if (ret < 0) {
+            goto out;
+        }
+    }
+out:
+    qapi_free_MemoryDeviceInfoList(info_list);
+    return ret;
+}
+
 int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
                  hwaddr addr_limit, AddressSpace *as)
 {
@@ -611,6 +640,12 @@ int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
         }
     }
 
+    rc = fdt_add_hotpluggable_memory_nodes(fdt, acells, scells);
+    if (rc < 0) {
+            fprintf(stderr, "couldn't add hotpluggable memory nodes\n");
+            goto fail;
+    }
+
     rc = fdt_path_offset(fdt, "/chosen");
     if (rc < 0) {
         qemu_fdt_add_subnode(fdt, "/chosen");
-- 
2.17.1