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[qemu-s390x] [PATCH v4 14/15] spapr: add hotplug hooks for PHB hotplug


From: Greg Kurz
Subject: [qemu-s390x] [PATCH v4 14/15] spapr: add hotplug hooks for PHB hotplug
Date: Tue, 12 Feb 2019 19:25:25 +0100
User-agent: StGit/unknown-version

Hotplugging PHBs is a machine-level operation, but PHBs reside on the
main system bus, so we register spapr machine as the handler for the
main system bus.

Provide the usual pre-plug, plug and unplug-request handlers.

Move the checking of the PHB index to the pre-plug handler. It is okay
to do that and assert in the realize function because the pre-plug
handler is always called, even for the oldest machine types we support.

Unlike with other device types, there are some cases where we cannot
provide the FDT fragment of the PHB from the plug handler, eg, before
KVMPPC_H_UPDATE_DT was called. Do this from a DRC callback that is
called just before the first FDT fragment is exposed to the guest.

Signed-off-by: Michael Roth <address@hidden>
(Fixed interrupt controller phandle in "interrupt-map" and
 TCE table size in "ibm,dma-window" FDT fragment, Greg Kurz)
Signed-off-by: Greg Kurz <address@hidden>
---
v4: - populate FDT fragment in a DRC callback
v3: - reworked phandle handling some more
v2: - reworked phandle handling
    - sync LSIs to KVM
---
---
 hw/ppc/spapr.c         |  121 ++++++++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_drc.c     |    2 +
 hw/ppc/spapr_pci.c     |   16 ------
 include/hw/ppc/spapr.h |    5 ++
 4 files changed, 127 insertions(+), 17 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 021758825b7e..06ce0babcb54 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2930,6 +2930,11 @@ static void spapr_machine_init(MachineState *machine)
     register_savevm_live(NULL, "spapr/htab", -1, 1,
                          &savevm_htab_handlers, spapr);
 
+    if (smc->dr_phb_enabled) {
+        qbus_set_hotplug_handler(sysbus_get_default(), OBJECT(machine),
+                                 &error_fatal);
+    }
+
     qemu_register_boot_set(spapr_boot_set, spapr);
 
     if (kvm_enabled()) {
@@ -3733,6 +3738,108 @@ out:
     error_propagate(errp, local_err);
 }
 
+int spapr_dt_phb(DeviceState *dev, sPAPRMachineState *spapr, void *fdt,
+                 int *fdt_start_offset, Error **errp)
+{
+    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(dev);
+    uint32_t intc_phandle;
+
+    if (spapr_irq_get_phandle(spapr, spapr->fdt_blob, &intc_phandle, errp)) {
+        return -1;
+    }
+
+    if (spapr_populate_pci_dt(sphb, intc_phandle, fdt, spapr->irq->nr_msis,
+                              fdt_start_offset)) {
+        error_setg(errp, "unable to create FDT node for PHB %d", sphb->index);
+        return -1;
+    }
+
+    /* generally SLOF creates these, for hotplug it's up to QEMU */
+    _FDT(fdt_setprop_string(fdt, *fdt_start_offset, "name", "pci"));
+
+    return 0;
+}
+
+static void spapr_phb_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
+                               Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
+    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(dev);
+    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
+    const unsigned windows_supported = spapr_phb_windows_supported(sphb);
+
+    if (sphb->index == (uint32_t)-1) {
+        error_setg(errp, "\"index\" for PAPR PHB is mandatory");
+        return;
+    }
+
+    /*
+     * This will check that sphb->index doesn't exceed the maximum number of
+     * PHBs for the current machine type.
+     */
+    smc->phb_placement(spapr, sphb->index,
+                       &sphb->buid, &sphb->io_win_addr,
+                       &sphb->mem_win_addr, &sphb->mem64_win_addr,
+                       windows_supported, sphb->dma_liobn, errp);
+}
+
+static void spapr_phb_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
+                           Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
+    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
+    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(dev);
+    sPAPRDRConnector *drc;
+    bool hotplugged = spapr_drc_hotplugged(dev);
+    Error *local_err = NULL;
+
+    if (!smc->dr_phb_enabled) {
+        return;
+    }
+
+    drc = spapr_drc_by_id(TYPE_SPAPR_DRC_PHB, sphb->index);
+    /* hotplug hooks should check it's enabled before getting this far */
+    assert(drc);
+
+    /*
+     * The FDT fragment will be added during the first invocation of RTAS
+     * ibm,client-architecture-support  for this device, when we're sure
+     * that the IOMMU is configured and that QEMU knows the phandle of the
+     * interrupt controller.
+     */
+    spapr_drc_attach(drc, DEVICE(dev), NULL, 0, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    if (hotplugged) {
+        spapr_hotplug_req_add_by_index(drc);
+    } else {
+        spapr_drc_reset(drc);
+    }
+}
+
+void spapr_phb_release(DeviceState *dev)
+{
+    object_unparent(OBJECT(dev));
+}
+
+static void spapr_phb_unplug_request(HotplugHandler *hotplug_dev,
+                                     DeviceState *dev, Error **errp)
+{
+    sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(dev);
+    sPAPRDRConnector *drc;
+
+    drc = spapr_drc_by_id(TYPE_SPAPR_DRC_PHB, sphb->index);
+    assert(drc);
+
+    if (!spapr_drc_unplug_requested(drc)) {
+        spapr_drc_detach(drc);
+        spapr_hotplug_req_remove_by_index(drc);
+    }
+}
+
 static void spapr_machine_device_plug(HotplugHandler *hotplug_dev,
                                       DeviceState *dev, Error **errp)
 {
@@ -3740,6 +3847,8 @@ static void spapr_machine_device_plug(HotplugHandler 
*hotplug_dev,
         spapr_memory_plug(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
         spapr_core_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) {
+        spapr_phb_plug(hotplug_dev, dev, errp);
     }
 }
 
@@ -3758,6 +3867,7 @@ static void 
spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
 {
     sPAPRMachineState *sms = SPAPR_MACHINE(OBJECT(hotplug_dev));
     MachineClass *mc = MACHINE_GET_CLASS(sms);
+    sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(mc);
 
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         if (spapr_ovec_test(sms->ov5_cas, OV5_HP_EVT)) {
@@ -3777,6 +3887,12 @@ static void 
spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
             return;
         }
         spapr_core_unplug_request(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) {
+        if (!smc->dr_phb_enabled) {
+            error_setg(errp, "PHB hot unplug not supported on this machine");
+            return;
+        }
+        spapr_phb_unplug_request(hotplug_dev, dev, errp);
     }
 }
 
@@ -3787,6 +3903,8 @@ static void spapr_machine_device_pre_plug(HotplugHandler 
*hotplug_dev,
         spapr_memory_pre_plug(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
         spapr_core_pre_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) {
+        spapr_phb_pre_plug(hotplug_dev, dev, errp);
     }
 }
 
@@ -3794,7 +3912,8 @@ static HotplugHandler 
*spapr_get_hotplug_handler(MachineState *machine,
                                                  DeviceState *dev)
 {
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
-        object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
+        object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE) ||
+        object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) {
         return HOTPLUG_HANDLER(machine);
     }
     return NULL;
diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index c5a281915665..22563a381a37 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -709,6 +709,8 @@ static void spapr_drc_phb_class_init(ObjectClass *k, void 
*data)
     drck->typeshift = SPAPR_DR_CONNECTOR_TYPE_SHIFT_PHB;
     drck->typename = "PHB";
     drck->drc_name_prefix = "PHB ";
+    drck->release = spapr_phb_release;
+    drck->populate_dt = spapr_dt_phb;
 }
 
 static const TypeInfo spapr_dr_connector_info = {
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 7df7f6502f93..d0caca627455 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1647,21 +1647,7 @@ static void spapr_phb_realize(DeviceState *dev, Error 
**errp)
         return;
     }
 
-    if (sphb->index != (uint32_t)-1) {
-        Error *local_err = NULL;
-
-        smc->phb_placement(spapr, sphb->index,
-                           &sphb->buid, &sphb->io_win_addr,
-                           &sphb->mem_win_addr, &sphb->mem64_win_addr,
-                           windows_supported, sphb->dma_liobn, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
-            return;
-        }
-    } else {
-        error_setg(errp, "\"index\" for PAPR PHB is mandatory");
-        return;
-    }
+    assert(sphb->index != (uint32_t)-1); /* checked in spapr_phb_pre_plug() */
 
     if (sphb->mem64_win_size != 0) {
         if (sphb->mem_win_size > SPAPR_PCI_MEM32_WIN_SIZE) {
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index a3074e7fea37..69d9c2196ca2 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -764,9 +764,12 @@ void spapr_reallocate_hpt(sPAPRMachineState *spapr, int 
shift,
 void spapr_clear_pending_events(sPAPRMachineState *spapr);
 int spapr_max_server_number(sPAPRMachineState *spapr);
 
-/* CPU and LMB DRC release callbacks. */
+/* DRC callbacks. */
 void spapr_core_release(DeviceState *dev);
 void spapr_lmb_release(DeviceState *dev);
+void spapr_phb_release(DeviceState *dev);
+int spapr_dt_phb(DeviceState *dev, sPAPRMachineState *spapr, void *fdt,
+                 int *fdt_start_offset, Error **errp);
 
 void spapr_rtc_read(sPAPRRTCState *rtc, struct tm *tm, uint32_t *ns);
 int spapr_rtc_import_offset(sPAPRRTCState *rtc, int64_t legacy_offset);




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