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Re: [Qemu-devel] [PATCH 15/15] spapr: add hotplug hooks for PHB hotplug
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From: |
Greg Kurz |
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Subject: |
Re: [Qemu-devel] [PATCH 15/15] spapr: add hotplug hooks for PHB hotplug |
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Date: |
Tue, 8 Jan 2019 11:18:12 +0100 |
On Thu, 3 Jan 2019 13:17:03 +1100
David Gibson <address@hidden> wrote:
> On Fri, Dec 21, 2018 at 07:36:12AM +0100, Greg Kurz wrote:
> > From: Michael Roth <address@hidden>
> >
> > 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.
> >
> > We re-get the phandle of the interrupt controller systematically for
> > simplicity.
> >
> > Signed-off-by: Michael Roth <address@hidden>
> > Signed-off-by: Greg Kurz <address@hidden>
> > ---
> > hw/ppc/spapr.c | 147
> > ++++++++++++++++++++++++++++++++++++++++++++++++
> > hw/ppc/spapr_drc.c | 1
> > hw/ppc/spapr_pci.c | 16 -----
> > include/hw/ppc/spapr.h | 1
> > 4 files changed, 149 insertions(+), 16 deletions(-)
> >
> > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > index 5c405a5fafca..065c9f19700e 100644
> > --- a/hw/ppc/spapr.c
> > +++ b/hw/ppc/spapr.c
> > @@ -2923,6 +2923,10 @@ 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),
> > NULL);
> > + }
> > +
> > qemu_register_boot_set(spapr_boot_set, spapr);
> >
> > if (kvm_enabled()) {
> > @@ -3716,6 +3720,135 @@ out:
> > error_propagate(errp, local_err);
> > }
> >
> > +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);
> > + void *fdt = NULL;
> > + int fdt_start_offset;
> > + int fdt_size;
> > + Error *local_err = NULL;
> > + sPAPRDRConnector *drc;
> > + int ret;
> > + bool hotplugged = spapr_drc_hotplugged(dev);
> > + int offset, phandle = 0;
> > + gchar *nodename = 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);
> > +
> > + if (hotplugged) {
> > + if (spapr->fdt_blob) {
> > + /*
> > + * SLOF might have pushed an updated FDT with new phandle
> > values.
> > + * Re-get the one of our interrupt controller.
> > + */
> > + nodename = spapr->irq->get_nodename(spapr);
> > +
> > + offset = fdt_subnode_offset(spapr->fdt_blob, 0, nodename);
> > + if (offset < 0) {
> > + error_setg(errp, "Can't find node \"%s\": %s",
> > + nodename, fdt_strerror(offset));
> > + goto out;
> > + }
> > +
> > + phandle = fdt_get_phandle(spapr->fdt_blob, offset);
> > + if (phandle < 0) {
> > + error_setg(errp, "Can't get phandle of node \"%s\": %s",
> > + nodename, fdt_strerror(offset));
> > + goto out;
> > + }
> > + }
> > + DEVICE_GET_CLASS(dev)->reset(dev);
> > + }
> > +
> > + /* For cold-plugged at initial boot and fallback for hotplug */
> > + if (!phandle) {
> > + phandle = PHANDLE_XICP;
> > + }
> > +
> > + fdt = create_device_tree(&fdt_size);
> > + ret = spapr_populate_pci_dt(sphb, phandle, fdt, spapr->irq->nr_msis,
> > + &fdt_start_offset);
> > + if (ret < 0) {
> > + error_setg(&local_err, "unable to create FDT for %sPHB",
> > + dev->hotplugged ? "hotplugged " : "");
> > + goto out;
> > + }
> > +
> > + if (hotplugged) {
> > + /* generally SLOF creates these, for hotplug it's up to QEMU */
> > + _FDT(fdt_setprop_string(fdt, fdt_start_offset, "name", "pci"));
> > + }
> > +
> > + spapr_drc_attach(drc, DEVICE(dev), fdt, fdt_start_offset, &local_err);
> > +
> > +out:
> > + g_free(nodename);
> > +
> > + if (local_err) {
> > + error_propagate(errp, local_err);
> > + g_free(fdt);
> > + return;
> > + }
> > +
> > + if (hotplugged) {
> > + spapr_hotplug_req_add_by_index(drc);
> > + } else if (drc) {
> > + 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)
> > {
> > @@ -3723,6 +3856,8 @@ 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);
> > }
> > }
> >
> > @@ -3741,6 +3876,7 @@ 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)) {
> > @@ -3760,6 +3896,12 @@ 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);
> > }
> > }
> >
> > @@ -3770,6 +3912,8 @@ 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);
> > }
> > }
> >
> > @@ -3777,7 +3921,8 @@ 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 189ee681062a..7a2676716364 100644
> > --- a/hw/ppc/spapr_drc.c
> > +++ b/hw/ppc/spapr_drc.c
> > @@ -703,6 +703,7 @@ 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;
> > }
> >
> > static const TypeInfo spapr_dr_connector_info = {
> > diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> > index 688cca83ef2f..5bc912aa0028 100644
> > --- a/hw/ppc/spapr_pci.c
> > +++ b/hw/ppc/spapr_pci.c
> > @@ -1627,21 +1627,7 @@ 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() */
>
> Could this cause an unexpected assert if you're using an older machine
> type that doesn't install the hotplug handler, then don't supply an
> index on the command line?
>
AFAICS all machine types do install the hotplug handler.
static void spapr_machine_class_init(ObjectClass *oc, void *data)
{
...
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
...
hc->pre_plug = spapr_machine_device_pre_plug;
hc->plug = spapr_machine_device_plug;
and so we get:
$ ppc64-softmmu/qemu-system-ppc64 -machine pseries-2.1 -device
spapr-pci-host-bridge
qemu-system-ppc64: -device spapr-pci-host-bridge: "index" for PAPR PHB is
mandatory
which is expected since we deliberately broke backward compatibility when we
made "index" mandatory (see commit 30b3bc5aa9f4 for details).
> > 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 e96deefa30de..eff479b0a019 100644
> > --- a/include/hw/ppc/spapr.h
> > +++ b/include/hw/ppc/spapr.h
> > @@ -764,6 +764,7 @@ int spapr_max_server_number(sPAPRMachineState *spapr);
> > /* CPU and LMB DRC release callbacks. */
> > void spapr_core_release(DeviceState *dev);
> > void spapr_lmb_release(DeviceState *dev);
> > +void spapr_phb_release(DeviceState *dev);
> >
> > 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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