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[RFC,35/52] i386: Support APIC ID topology for hybrid CPU topology

Message ID 20230213095035.158240-36-zhao1.liu@linux.intel.com
State New
Headers show
Series Introduce hybrid CPU topology | expand

Commit Message

Zhao Liu Feb. 13, 2023, 9:50 a.m. UTC 
From: Zhao Liu <zhao1.liu@intel.com>

X86ApicidTopoInfo is used to caculate offsets of topology levels for
APIC ID.

For hybrid CPU topology, X86ApicidTopoInfo should get the maximum
possible number of corresponding topology structures in each topology
level (currently, only for core and thread level).

Co-Developed-by: Zhuocheng Ding <zhuocheng.ding@intel.com>
Signed-off-by: Zhuocheng Ding <zhuocheng.ding@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 hw/i386/x86.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)
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Patch

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 9ee0fcb9a460..1c071f8120cb 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -70,10 +70,37 @@  inline void init_apicid_topo_info(X86ApicidTopoInfo *apicid_topo,
 {
     MachineState *ms = MACHINE(x86ms);
 
+    /*
+     * At present, the packages and dies in the hybrid CPU topology are the
+     * same, so the numbers of dies in one package and the numbers of modules
+     * in the dies are also the same.
+     */
     apicid_topo->max_dies = machine_topo_get_dies(ms);
     apicid_topo->max_modules = machine_topo_get_clusters(ms);
-    apicid_topo->max_cores = machine_topo_get_smp_cores(ms);
-    apicid_topo->max_threads = machine_topo_get_smp_threads(ms);
+
+    if (machine_topo_is_smp(ms)) {
+        apicid_topo->max_cores = machine_topo_get_smp_cores(ms);
+        apicid_topo->max_threads = machine_topo_get_smp_threads(ms);
+    } else {
+        int max_cores = 0;
+        int max_threads = 0;
+        int nr_clusters = machine_topo_get_clusters(ms);
+        int nr_cores, nr_threads;
+
+        for (int i = 0; i < nr_clusters; i++) {
+            nr_cores = machine_topo_get_cores(ms, i);
+            max_cores = max_cores > nr_cores ? max_cores : nr_cores;
+
+            for (int j = 0; j < nr_cores; j++) {
+                nr_threads = machine_topo_get_threads(ms, i, j);
+                max_threads = max_threads > nr_threads ?
+                              max_threads : nr_threads;
+            }
+        }
+
+        apicid_topo->max_cores = max_cores;
+        apicid_topo->max_threads = max_threads;
+    }
 }
 
 /*