[3/8] hw/core: Add smp cache topology for machine

Commit Message

Zhao Liu July 4, 2024, 3:15 a.m. UTC

With smp-cache object support, add smp cache topology for machine by
linking the smp-cache object.

Also add a helper to access cache topology level.

Signed-off-by: Zhao Liu <[e-mail]>
---
Changes since RFC v2:
 * Linked machine's smp_cache to smp-cache object instead of a builtin
   structure. This is to get around the fact that the keyval format of
   -machine can't support JSON.
 * Wrapped the cache topology level access into a helper.
---
 hw/core/machine-smp.c | 6 ++++++
 hw/core/machine.c     | 9 +++++++++
 include/hw/boards.h   | 5 ++++-
 3 files changed, 19 insertions(+), 1 deletion(-)

Patch

diff --git a/hw/core/machine-smp.c b/hw/core/machine-smp.c
index 5d8d7edcbd3f..88a73743eb1c 100644
--- a/hw/core/machine-smp.c
+++ b/hw/core/machine-smp.c
@@ -270,3 +270,9 @@  unsigned int machine_topo_get_threads_per_socket(const MachineState *ms)
 {
     return ms->smp.threads * machine_topo_get_cores_per_socket(ms);
 }
+
+CpuTopologyLevel machine_get_cache_topo_level(const MachineState *ms,
+                                              SMPCacheName cache)
+{
+    return ms->smp_cache->props[cache].topo;
+}
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 655d75c21fc1..09ef9fcd4a0b 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -1045,6 +1045,15 @@  static void machine_class_init(ObjectClass *oc, void *data)
     object_class_property_set_description(oc, "smp",
         "CPU topology");
 
+    /* TODO: Implement check() method based on machine support. */
+    object_class_property_add_link(oc, "smp-cache",
+                                   TYPE_SMP_CACHE,
+                                   offsetof(MachineState, smp_cache),
+                                   object_property_allow_set_link,
+                                   OBJ_PROP_LINK_STRONG);
+    object_class_property_set_description(oc, "smp-cache",
+        "SMP cache property");
+
     object_class_property_add(oc, "phandle-start", "int",
         machine_get_phandle_start, machine_set_phandle_start,
         NULL, NULL);
diff --git a/include/hw/boards.h b/include/hw/boards.h
index ef6f18f2c1a7..56fa252cfcd2 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -6,10 +6,10 @@ 
 #include "exec/memory.h"
 #include "sysemu/hostmem.h"
 #include "sysemu/blockdev.h"
-#include "qapi/qapi-types-machine.h"
 #include "qemu/module.h"
 #include "qom/object.h"
 #include "hw/core/cpu.h"
+#include "hw/core/smp-cache.h"
 
 #define TYPE_MACHINE_SUFFIX "-machine"
 
@@ -45,6 +45,8 @@  void machine_parse_smp_config(MachineState *ms,
                               const SMPConfiguration *config, Error **errp);
 unsigned int machine_topo_get_cores_per_socket(const MachineState *ms);
 unsigned int machine_topo_get_threads_per_socket(const MachineState *ms);
+CpuTopologyLevel machine_get_cache_topo_level(const MachineState *ms,
+                                              SMPCacheName cache);
 void machine_memory_devices_init(MachineState *ms, hwaddr base, uint64_t size);
 
 /**
@@ -409,6 +411,7 @@  struct MachineState {
     AccelState *accelerator;
     CPUArchIdList *possible_cpus;
     CpuTopology smp;
+    SMPCache *smp_cache;
     struct NVDIMMState *nvdimms_state;
     struct NumaState *numa_state;
 };