commit 36ad84ecb26d6a28c78d079dc51063d972600592
author Bibo Mao <maobibo@loongson.cn> Fri Mar 07 09:34:41 2025 +0800
committer Bibo Mao <maobibo@loongson.cn> Tue May 06 09:17:32 2025 +0800
tree c4bfe330d6522741be4b4c0c4947c0e4a1331553
parent 5134cf9b5d3aee4475fe7e1c1c11b093731073cf

hw/intc/loongarch_ipi: Add reset support

Add reset support with ipi object, register reset callback and clear
internal registers when virt machine resets.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>

hw/intc/loongarch_ipi.c

diff --git a/hw/intc/loongarch_ipi.c b/hw/intc/loongarch_ipi.c
index 2f8bb57..74372a2 100644
--- a/hw/intc/loongarch_ipi.c
+++ b/hw/intc/loongarch_ipi.c
@@ -93,6 +93,32 @@
     }
 }
 
+static void loongarch_ipi_reset_hold(Object *obj, ResetType type)
+{
+    int i;
+    LoongarchIPIClass *lic = LOONGARCH_IPI_GET_CLASS(obj);
+    LoongsonIPICommonState *lics = LOONGSON_IPI_COMMON(obj);
+    IPICore *core;
+
+    if (lic->parent_phases.hold) {
+        lic->parent_phases.hold(obj, type);
+    }
+
+    for (i = 0; i < lics->num_cpu; i++) {
+        core = lics->cpu + i;
+        /* IPI with targeted CPU available however not present */
+        if (!core->cpu) {
+            continue;
+        }
+
+        core->status = 0;
+        core->en = 0;
+        core->set = 0;
+        core->clear = 0;
+        memset(core->buf, 0, sizeof(core->buf));
+    }
+}
+
 static void loongarch_ipi_cpu_plug(HotplugHandler *hotplug_dev,
                                    DeviceState *dev, Error **errp)
 {
@@ -145,10 +171,13 @@
     LoongsonIPICommonClass *licc = LOONGSON_IPI_COMMON_CLASS(klass);
     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
     LoongarchIPIClass *lic = LOONGARCH_IPI_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     device_class_set_parent_realize(dc, loongarch_ipi_realize,
                                     &lic->parent_realize);
+    resettable_class_set_parent_phases(rc, NULL, loongarch_ipi_reset_hold,
+                                       NULL, &lic->parent_phases);
     licc->get_iocsr_as = get_iocsr_as;
     licc->cpu_by_arch_id = loongarch_cpu_by_arch_id;
     hc->plug = loongarch_ipi_cpu_plug;

include/hw/intc/loongarch_ipi.h

diff --git a/include/hw/intc/loongarch_ipi.h b/include/hw/intc/loongarch_ipi.h
index 923bf21..a7c6bf8 100644
--- a/include/hw/intc/loongarch_ipi.h
+++ b/include/hw/intc/loongarch_ipi.h
@@ -21,6 +21,7 @@
 struct LoongarchIPIClass {
     LoongsonIPICommonClass parent_class;
     DeviceRealize parent_realize;
+    ResettablePhases parent_phases;
 };
 
 #endif