Re: [Qemu-devel] [for-2.11 PATCH 18/26] spapr: create DR connectors for PHBs

[David Gibson <david@gibson.dropbear.id.au>]

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On Fri, Jul 28, 2017 at 12:30:35PM +0200, Greg Kurz wrote:
> On Fri, 28 Jul 2017 13:49:25 +1000
> David Gibson <david@gibson.dropbear.id.au> wrote:
> 
> > On Tue, Jul 25, 2017 at 08:01:50PM +0200, Greg Kurz wrote:
> > > From: Michael Roth <mdroth@linux.vnet.ibm.com>
> > > 
> > > Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> > > Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> > > Signed-off-by: Greg Kurz <groug@kaod.org>  
> > 
> > 
> > 
> > > ---
> > > Changes since RFC:
> > > - rebased against ppc-for-2.10 (reset hooks registering already merged)
> > > - added new DRC type for PHB
> > > ---
> > >  hw/ppc/spapr.c             |   15 +++++++++++++++
> > >  hw/ppc/spapr_drc.c         |   17 +++++++++++++++++
> > >  include/hw/ppc/spapr_drc.h |    8 ++++++++
> > >  3 files changed, 40 insertions(+)
> > > 
> > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > > index 8dc505343c0f..5950c009ab7e 100644
> > > --- a/hw/ppc/spapr.c
> > > +++ b/hw/ppc/spapr.c
> > > @@ -98,6 +98,9 @@
> > >  
> > >  #define PHANDLE_XICP            0x00001111
> > >  
> > > +/* maximum number of hotpluggable PHBs */
> > > +#define SPAPR_DRC_MAX_PHB       256  
> > 
> > I wonder if we should actually make this a machine property.
> > 
> 
> It makes sense.
> 
> Also, if all PHBs are instanciated with index != -1, we're limited to 31.
> Maybe this could be the default value for the machine property instead of
> 256 then ?

Actually, if we're binding it back to index, which has a hard limit,
then it no longer makes sense to have it as a property and we should
go back to a constant (well, it could vary by machine type version).

> > >  static ICSState *spapr_ics_create(sPAPRMachineState *spapr,
> > >                                    const char *type_ics,
> > >                                    int nr_irqs, Error **errp)
> > > @@ -2384,6 +2387,18 @@ static void ppc_spapr_init(MachineState *machine)
> > >  
> > >      spapr->dr_phb_enabled = smc->dr_phb_enabled;
> > >  
> > > +    /* Setup hotplug / dynamic-reconfiguration connectors. top-level
> > > +     * connectors (described in root DT node's "ibm,drc-types" property)
> > > +     * are pre-initialized here. additional child connectors (such as
> > > +     * connectors for a PHBs PCI slots) are added as needed during their
> > > +     * parent's realization.
> > > +     */
> > > +    if (spapr->dr_phb_enabled) {
> > > +        for (i = 0; i < SPAPR_DRC_MAX_PHB; i++) {
> > > +            spapr_dr_connector_new(OBJECT(machine), TYPE_SPAPR_DRC_PHB, i);
> > > +        }
> > > +    }
> > > +
> > >      /* Set up PCI */
> > >      spapr_pci_rtas_init();
> > >  
> > > diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
> > > index eb8024d37c54..2e1049ce61c7 100644
> > > --- a/hw/ppc/spapr_drc.c
> > > +++ b/hw/ppc/spapr_drc.c
> > > @@ -697,6 +697,15 @@ static void spapr_drc_lmb_class_init(ObjectClass *k, void *data)
> > >      drck->release = spapr_lmb_release;
> > >  }
> > >  
> > > +static void spapr_drc_phb_class_init(ObjectClass *k, void *data)
> > > +{
> > > +    sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_CLASS(k);
> > > +
> > > +    drck->typeshift = SPAPR_DR_CONNECTOR_TYPE_SHIFT_PHB;
> > > +    drck->typename = "PHB";
> > > +    drck->drc_name_prefix = "PHB ";
> > > +}
> > > +
> > >  static const TypeInfo spapr_dr_connector_info = {
> > >      .name          = TYPE_SPAPR_DR_CONNECTOR,
> > >      .parent        = TYPE_DEVICE,
> > > @@ -740,6 +749,13 @@ static const TypeInfo spapr_drc_lmb_info = {
> > >      .class_init    = spapr_drc_lmb_class_init,
> > >  };
> > >  
> > > +static const TypeInfo spapr_drc_phb_info = {
> > > +    .name          = TYPE_SPAPR_DRC_PHB,
> > > +    .parent        = TYPE_SPAPR_DRC_LOGICAL,  
> > 
> > I thought PHB DRCs were physical..
> > 
> 
> My understanding is that only PCI IOAs need a physical DRC.
> 
> From LoPAPR v1.1 (March 24, 2016):
> 
> 13.7 Logical Resource Dynamic Reconfiguration (LRDR)
> 
> The Logical Resource Dynamic Reconfiguration option allows a platform to make available and recover platform re-
> sources such as CPUs, Memory Regions, Processor Host Bridges, and I/O slots to/from its operating OS image(s).
> 
> ...
> 
> The device tree contains logical resource DR connectors for the maximum number of resources that the platform can
> allocate to the specific OS. In some cases such as for processors and PHBs...
> 
> and
> 
> Table 240. Currently Defined DR Connector Types
> 
> | PHB | Logical PCI Host Bridge |

Ah, my mistake.

> 
> > > +    .instance_size = sizeof(sPAPRDRConnector),
> > > +    .class_init    = spapr_drc_phb_class_init,
> > > +};
> > > +
> > >  /* helper functions for external users */
> > >  
> > >  sPAPRDRConnector *spapr_drc_by_index(uint32_t index)
> > > @@ -1179,6 +1195,7 @@ static void spapr_drc_register_types(void)
> > >      type_register_static(&spapr_drc_cpu_info);
> > >      type_register_static(&spapr_drc_pci_info);
> > >      type_register_static(&spapr_drc_lmb_info);
> > > +    type_register_static(&spapr_drc_phb_info);
> > >  
> > >      spapr_rtas_register(RTAS_SET_INDICATOR, "set-indicator",
> > >                          rtas_set_indicator);
> > > diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h
> > > index a7958d0a8d14..535fc61b98a8 100644
> > > --- a/include/hw/ppc/spapr_drc.h
> > > +++ b/include/hw/ppc/spapr_drc.h
> > > @@ -69,6 +69,14 @@
> > >  #define SPAPR_DRC_LMB(obj) OBJECT_CHECK(sPAPRDRConnector, (obj), \
> > >                                          TYPE_SPAPR_DRC_LMB)
> > >  
> > > +#define TYPE_SPAPR_DRC_PHB "spapr-drc-phb"
> > > +#define SPAPR_DRC_PHB_GET_CLASS(obj) \
> > > +        OBJECT_GET_CLASS(sPAPRDRConnectorClass, obj, TYPE_SPAPR_DRC_PHB)
> > > +#define SPAPR_DRC_PHB_CLASS(klass) \
> > > +        OBJECT_CLASS_CHECK(sPAPRDRConnectorClass, klass, TYPE_SPAPR_DRC_PHB)
> > > +#define SPAPR_DRC_PHB(obj) OBJECT_CHECK(sPAPRDRConnector, (obj), \
> > > +                                        TYPE_SPAPR_DRC_PHB)
> > > +
> > >  /*
> > >   * Various hotplug types managed by sPAPRDRConnector
> > >   *
> > >   
> > 
> 



-- 
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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