On 12.02.19 19:25, Greg Kurz wrote:
> 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 <mdr...@linux.vnet.ibm.com>
> (Fixed interrupt controller phandle in "interrupt-map" and
> TCE table size in "ibm,dma-window" FDT fragment, Greg Kurz)
> Signed-off-by: Greg Kurz <gr...@kaod.org>
> ---
> 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));
> +}
> +
Please call the unplug handler here just like we already do with
spapr_phb_remove_pci_device_cb().
And add a _unplug handler that simply calls e.g.
qdev_simple_device_unplug_cb
Otherwise this will break with
[PATCH RFCv2 0/9] qdev: Hotplug handler chaining + virtio-pmem
> +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);
>
--
Thanks,
David / dhildenb
