xive: Add a "presenter" link property to the TCTX object

This will be used in subsequent patches to access the XIVE associated to
a TCTX without reaching out to the machine through qdev_get_machine().

Signed-off-by: Cédric Le Goater <clg@kaod.org>
[ groug: - split patch
         - write subject and changelog ]
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200106145645.4539-9-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/intc/spapr_xive.c

@@ -601,7 +601,7 @@ static int spapr_xive_cpu_intc_create(SpaprInterruptController *intc,
     Object *obj;
     SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
 
-    obj = xive_tctx_create(OBJECT(cpu), XIVE_ROUTER(xive), errp);
+    obj = xive_tctx_create(OBJECT(cpu), XIVE_PRESENTER(xive), errp);
     if (!obj) {
         return -1;
     }

hw/intc/xive.c

@@ -654,6 +654,7 @@ static void xive_tctx_realize(DeviceState *dev, Error **errp)
     Error *local_err = NULL;
 
     assert(tctx->cs);
+    assert(tctx->xptr);
 
     cpu = POWERPC_CPU(tctx->cs);
     env = &cpu->env;
@@ -727,6 +728,8 @@ static const VMStateDescription vmstate_xive_tctx = {
 
 static Property xive_tctx_properties[] = {
     DEFINE_PROP_LINK("cpu", XiveTCTX, cs, TYPE_CPU, CPUState *),
+    DEFINE_PROP_LINK("presenter", XiveTCTX, xptr, TYPE_XIVE_PRESENTER,
+                     XivePresenter *),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -752,7 +755,7 @@ static const TypeInfo xive_tctx_info = {
     .class_init    = xive_tctx_class_init,
 };
 
-Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp)
+Object *xive_tctx_create(Object *cpu, XivePresenter *xptr, Error **errp)
 {
     Error *local_err = NULL;
     Object *obj;
@@ -761,6 +764,7 @@ Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp)
     object_property_add_child(cpu, TYPE_XIVE_TCTX, obj, &error_abort);
     object_unref(obj);
     object_property_set_link(obj, cpu, "cpu", &error_abort);
+    object_property_set_link(obj, OBJECT(xptr), "presenter", &error_abort);
     object_property_set_bool(obj, true, "realized", &local_err);
     if (local_err) {
         goto error;

hw/ppc/pnv.c

@@ -925,7 +925,8 @@ static void pnv_chip_power9_intc_create(PnvChip *chip, PowerPCCPU *cpu,
      * controller object is initialized afterwards. Hopefully, it's
      * only used at runtime.
      */
-    obj = xive_tctx_create(OBJECT(cpu), XIVE_ROUTER(&chip9->xive), &local_err);
+    obj = xive_tctx_create(OBJECT(cpu), XIVE_PRESENTER(&chip9->xive),
+                           &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;

include/hw/ppc/xive.h

@@ -311,6 +311,8 @@ void xive_source_set_irq(void *opaque, int srcno, int val);
 #define XIVE_TM_RING_COUNT      4
 #define XIVE_TM_RING_SIZE       0x10
 
+typedef struct XivePresenter XivePresenter;
+
 typedef struct XiveTCTX {
     DeviceState parent_obj;
 
@@ -319,6 +321,8 @@ typedef struct XiveTCTX {
     qemu_irq    os_output;
 
     uint8_t     regs[XIVE_TM_RING_COUNT * XIVE_TM_RING_SIZE];
+
+    XivePresenter *xptr;
 } XiveTCTX;
 
 /*
@@ -378,8 +382,6 @@ typedef struct XiveTCTXMatch {
     uint8_t ring;
 } XiveTCTXMatch;
 
-typedef struct XivePresenter XivePresenter;
-
 #define TYPE_XIVE_PRESENTER "xive-presenter"
 #define XIVE_PRESENTER(obj)                                     \
     INTERFACE_CHECK(XivePresenter, (obj), TYPE_XIVE_PRESENTER)
@@ -467,7 +469,7 @@ uint64_t xive_tctx_tm_read(XivePresenter *xptr, XiveTCTX *tctx, hwaddr offset,
                            unsigned size);
 
 void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon);
-Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp);
+Object *xive_tctx_create(Object *cpu, XivePresenter *xptr, Error **errp);
 void xive_tctx_reset(XiveTCTX *tctx);
 void xive_tctx_destroy(XiveTCTX *tctx);
 void xive_tctx_ipb_update(XiveTCTX *tctx, uint8_t ring, uint8_t ipb);