On Thu, 06 Oct 2022, Jonathan Cameron wrote:
One of the blockers for volatile support was that we had no means to poke
it properly as the kernel doesn't yet support volatile capacity and
no one has done the relevant work in EDK2 or similar to do it before the kernel
boots.
There has been some work on EDK2 support for ARM N2 FVPs from
Saanta Pattanayak, but not upstream eyt.
https://lpc.events/event/16/contributions/1254/
fwiw I had been trying to build some of the firmware bootup for the required
acpi tables that are particular to volatile capacity steps (srat/slit, hmat and
EFI Memory Map) by parameters, but got quickly out of hand. For example, the
srat
could use a passed 'node' and have a cxl_build_srat(), etc. But yeah it would
be nice for the EDK2 work to advance on the x86 end.
Thanks,
Davidlohr
diff --git a/hw/acpi/cxl.c b/hw/acpi/cxl.c
index 2bf8c0799359..1c3c6d17c222 100644
--- a/hw/acpi/cxl.c
+++ b/hw/acpi/cxl.c
@@ -254,3 +255,46 @@ void build_cxl_osc_method(Aml *dev)
+static int cxl_device_list(Object *obj, void *opaque)
+{
+ GSList **list = opaque;
+
+ if (object_dynamic_cast(obj, TYPE_CXL_TYPE3)) {
+ *list = g_slist_append(*list, DEVICE(obj));
+ }
+
+ object_child_foreach(obj, cxl_device_list, opaque);
+ return 0;
+}
+
+static GSList *cxl_get_device_list(void)
+{
+ GSList *list = NULL;
+
+ object_child_foreach(qdev_get_machine(), cxl_device_list, &list);
+ return list;
+}
+
+void cxl_build_srat(GArray *table_data)
+{
+ GSList *device_list, *list = cxl_get_device_list();
+
+ for (device_list = list; device_list; device_list = device_list->next) {
+ DeviceState *dev = device_list->data;
+ Object *obj = OBJECT(dev);
+ CXLType3Dev *ct3d = CXL_TYPE3(dev);
+ MemoryRegion *mr;
+ int node;
+
+ mr = host_memory_backend_get_memory(ct3d->hostmem);
+ if (!mr) {
+ continue;
+ }
+ node = object_property_get_uint(obj, "node", &error_abort);
+
+ build_srat_memory(table_data, mr->addr, mr->size, node,
MEM_AFFINITY_ENABLED);
+ }
+
+ g_slist_free(list);
+}
