[PATCH 3/6] hw/cxl: convert cxl-type3 to three-phase reset

[Junjie Cao <junjie.cao@intel.com>]

Replace the deprecated device_class_set_legacy_reset() registration
with the three-phase resettable interface, following the pattern
already established by the CXL root port (cxl_rp_reset_hold).

Only the hold phase is needed; enter and exit are left NULL.  The
parent hold phase is chained for correctness: TYPE_PCI_DEVICE installs
no hold phase today, so parent_phases.hold is currently NULL and the
chained call is a no-op, but capturing and invoking it is the correct
forward-compatible pattern and mirrors cxl_rp_reset_hold().

No functional change — the reset body is identical; only the
registration path and function signature change.

Signed-off-by: Junjie Cao <junjie.cao@intel.com>
---
 hw/mem/cxl_type3.c          | 16 ++++++++++++----
 include/hw/cxl/cxl_device.h |  2 ++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 4ac6eaa950..b842e71c66 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -1326,13 +1326,18 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data,
     return address_space_write(as, dpa_offset, attrs, &data, size);
 }
 
-static void ct3d_reset(DeviceState *dev)
+static void ct3d_reset_hold(Object *obj, ResetType type)
 {
-    CXLType3Dev *ct3d = CXL_TYPE3(dev);
+    CXLType3Dev *ct3d = CXL_TYPE3(obj);
+    CXLType3Class *cvc = CXL_TYPE3_GET_CLASS(obj);
     uint32_t *reg_state = ct3d->cxl_cstate.crb.cache_mem_registers;
     uint32_t *write_msk = ct3d->cxl_cstate.crb.cache_mem_regs_write_mask;
 
-    pcie_cap_fill_link_ep_usp(PCI_DEVICE(dev), ct3d->width, ct3d->speed,
+    if (cvc->parent_phases.hold) {
+        cvc->parent_phases.hold(obj, type);
+    }
+
+    pcie_cap_fill_link_ep_usp(PCI_DEVICE(obj), ct3d->width, ct3d->speed,
                               ct3d->flitmode);
     cxl_component_register_init_common(reg_state, write_msk,
                                        CXL2_TYPE3_DEVICE, ct3d->hdmdb);
@@ -2464,6 +2469,7 @@ static void ct3_class_init(ObjectClass *oc, const void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
     PCIDeviceClass *pc = PCI_DEVICE_CLASS(oc);
     CXLType3Class *cvc = CXL_TYPE3_CLASS(oc);
+    ResettableClass *rc = RESETTABLE_CLASS(oc);
 
     pc->realize = ct3_realize;
     pc->exit = ct3_exit;
@@ -2477,9 +2483,11 @@ static void ct3_class_init(ObjectClass *oc, const void *data)
 
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
     dc->desc = "CXL Memory Device (Type 3)";
-    device_class_set_legacy_reset(dc, ct3d_reset);
     device_class_set_props(dc, ct3_props);
 
+    resettable_class_set_parent_phases(rc, NULL, ct3d_reset_hold, NULL,
+                                       &cvc->parent_phases);
+
     cvc->get_lsa_size = get_lsa_size;
     cvc->get_lsa = get_lsa;
     cvc->set_lsa = set_lsa;
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index ba551fa5f9..b7e20e3fe4 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -805,6 +805,8 @@ struct CXLType3Class {
     /* Private */
     PCIDeviceClass parent_class;
 
+    ResettablePhases parent_phases;
+
     /* public */
     uint64_t (*get_lsa_size)(CXLType3Dev *ct3d);
 
-- 
2.43.0