On Tue, Nov 24, 2020 at 02:07:27PM +0100, Greg Kurz wrote:
> On Mon, 23 Nov 2020 16:13:18 +1100
> David Gibson <da...@gibson.dropbear.id.au> wrote:
>
> > On Sat, Nov 21, 2020 at 12:42:04AM +0100, Greg Kurz wrote:
> > > spapr_core_pre_plug() already guarantees that the slot for the given core
> > > ID is available. It is thus safe to assume that spapr_find_cpu_slot()
> > > returns a slot during plug. Turn the error path into an assertion.
> > > It is also safe to assume that no device is attached to the corresponding
> > > DRC and that spapr_drc_attach() shouldn't fail.
> > >
> > > Pass &error_abort to spapr_drc_attach() and simplify error handling.
> > >
> > > Signed-off-by: Greg Kurz <gr...@kaod.org>
> >
> > Applied to ppc-for-6.0, thanks.
> >
>
> This patch depends on the previous one.
>
> > > ---
> > > hw/ppc/spapr.c | 21 ++++++++++-----------
> > > 1 file changed, 10 insertions(+), 11 deletions(-)
> > >
> > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > > index da7586f548df..cfca033c7b14 100644
> > > --- a/hw/ppc/spapr.c
> > > +++ b/hw/ppc/spapr.c
> > > @@ -3739,8 +3739,7 @@ int spapr_core_dt_populate(SpaprDrc *drc,
> > > SpaprMachineState *spapr,
> > > return 0;
> > > }
> > >
> > > -static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState
> > > *dev,
> > > - Error **errp)
>
> ../../hw/ppc/spapr.c: In function ‘spapr_core_plug’:
> ../../hw/ppc/spapr.c:3802:32: error: ‘errp’ undeclared (first use in this
> function); did you mean ‘errno’?
> errp) < 0) {
> ^~~~
> errno
> ../../hw/ppc/spapr.c:3802:32: note: each undeclared identifier is reported
> only once for each function it appears in
>
> Please either drop it from ppc-for-6.0 or possibly adapt spapr_core_plug()
> to handle errors from ppc_set_compat().
Dropped for now (along with a later patch that depended on this one).
>
> <my 2 cents>
> Since I can't see how this could fail for a hotplugged CPU if it
> succeeded for the boot CPU, I'd pass &error_abort despite this
> being a hotplug path.
> </my 2 cents>
>
> > > +static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState
> > > *dev)
> > > {
> > > SpaprMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
> > > MachineClass *mc = MACHINE_GET_CLASS(spapr);
> > > @@ -3755,20 +3754,20 @@ static void spapr_core_plug(HotplugHandler
> > > *hotplug_dev, DeviceState *dev,
> > > int i;
> > >
> > > core_slot = spapr_find_cpu_slot(MACHINE(hotplug_dev), cc->core_id,
> > > &index);
> > > - if (!core_slot) {
> > > - error_setg(errp, "Unable to find CPU core with core-id: %d",
> > > - cc->core_id);
> > > - return;
> > > - }
> > > + g_assert(core_slot); /* Already checked in spapr_core_pre_plug() */
> > > +
> > > drc = spapr_drc_by_id(TYPE_SPAPR_DRC_CPU,
> > > spapr_vcpu_id(spapr, cc->core_id));
> > >
> > > g_assert(drc || !mc->has_hotpluggable_cpus);
> > >
> > > if (drc) {
> > > - if (!spapr_drc_attach(drc, dev, errp)) {
> > > - return;
> > > - }
> > > + /*
> > > + * spapr_core_pre_plug() already buys us this is a brand new
> > > + * core being plugged into a free slot. Nothing should already
> > > + * be attached to the corresponding DRC.
> > > + */
> > > + spapr_drc_attach(drc, dev, &error_abort);
> > >
> > > if (hotplugged) {
> > > /*
> > > @@ -3981,7 +3980,7 @@ static void
> > > spapr_machine_device_plug(HotplugHandler *hotplug_dev,
> > > if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> > > spapr_memory_plug(hotplug_dev, dev);
> > > } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> > > - spapr_core_plug(hotplug_dev, dev, errp);
> > > + spapr_core_plug(hotplug_dev, dev);
> > > } else if (object_dynamic_cast(OBJECT(dev),
> > > TYPE_SPAPR_PCI_HOST_BRIDGE)) {
> > > spapr_phb_plug(hotplug_dev, dev, errp);
> > > } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_TPM_PROXY)) {
> >
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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