Re: [PATCH] spapr: Move spapr_create_nvdimm_dr_connectors() to core machine code

[Greg Kurz]

On Tue, 13 Oct 2020 11:40:14 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Mon, Oct 12, 2020 at 12:15:21PM +0200, Greg Kurz wrote:
> > The spapr_create_nvdimm_dr_connectors() function doesn't need to access
> > any internal details of the sPAPR NVDIMM implementation. Also, pretty
> > much like for the LMBs, only spapr_machine_init() is responsible for the
> > creation of DR connectors for NVDIMMs.
> > 
> > Make this clear by making this function static in hw/ppc/spapr.c.
> > 
> > Signed-off-by: Greg Kurz <groug@kaod.org>
> 
> Hrm, I'm not really seeing the advantage to moving this.  It doesn't
> have to be in spapr_nvdimm for data hiding, but it is related, and
> spapr.c is kind of huge.
> 

The only advantage is to give an appropriate scope to this function,
as many other functions that create internal devices, eg. other DRC
types or the default PHB for which a similar change was accepted
2 years ago.

commit 999c9caf2eee66103195e1ec7580b379929db9d2
Author: Greg Kurz <groug@kaod.org>
Date:   Fri Dec 21 01:35:09 2018 +0100

    spapr: move spapr_create_phb() to core machine code
    
    This function is only used when creating the default PHB. Let's rename
    it and move it to the core machine code for clarity.
    
    Signed-off-by: Greg Kurz <groug@kaod.org>
    Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
    Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

I agree that spapr.c is huge indeed (4943 lines) but this increases its
size by _just_ 0.2 %. And there are certainly good candidates that
landed in spapr.c by _default_ over the years but should rather be
moved to their own compilation unit (eg. a bunch of FDT building
functions for various resources or some hotplug related functions
that don't need to access machine internals).

> > ---
> >  hw/ppc/spapr.c                |   10 ++++++++++
> >  hw/ppc/spapr_nvdimm.c         |   11 -----------
> >  include/hw/ppc/spapr_nvdimm.h |    1 -
> >  3 files changed, 10 insertions(+), 12 deletions(-)
> > 
> > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > index 63315f2d0fa9..ee716a12af73 100644
> > --- a/hw/ppc/spapr.c
> > +++ b/hw/ppc/spapr.c
> > @@ -2641,6 +2641,16 @@ static hwaddr spapr_rma_size(SpaprMachineState 
> > *spapr, Error **errp)
> >      return rma_size;
> >  }
> >  
> > +static void spapr_create_nvdimm_dr_connectors(SpaprMachineState *spapr)
> > +{
> > +    MachineState *machine = MACHINE(spapr);
> > +    int i;
> > +
> > +    for (i = 0; i < machine->ram_slots; i++) {
> > +        spapr_dr_connector_new(OBJECT(spapr), TYPE_SPAPR_DRC_PMEM, i);
> > +    }
> > +}
> > +
> >  /* pSeries LPAR / sPAPR hardware init */
> >  static void spapr_machine_init(MachineState *machine)
> >  {
> > diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c
> > index b3a489e9fe18..9e3d94071fe1 100644
> > --- a/hw/ppc/spapr_nvdimm.c
> > +++ b/hw/ppc/spapr_nvdimm.c
> > @@ -106,17 +106,6 @@ void spapr_add_nvdimm(DeviceState *dev, uint64_t slot, 
> > Error **errp)
> >      }
> >  }
> >  
> > -void spapr_create_nvdimm_dr_connectors(SpaprMachineState *spapr)
> > -{
> > -    MachineState *machine = MACHINE(spapr);
> > -    int i;
> > -
> > -    for (i = 0; i < machine->ram_slots; i++) {
> > -        spapr_dr_connector_new(OBJECT(spapr), TYPE_SPAPR_DRC_PMEM, i);
> > -    }
> > -}
> > -
> > -
> >  static int spapr_dt_nvdimm(SpaprMachineState *spapr, void *fdt,
> >                             int parent_offset, NVDIMMDevice *nvdimm)
> >  {
> > diff --git a/include/hw/ppc/spapr_nvdimm.h b/include/hw/ppc/spapr_nvdimm.h
> > index b834d82f5545..490b19a009f4 100644
> > --- a/include/hw/ppc/spapr_nvdimm.h
> > +++ b/include/hw/ppc/spapr_nvdimm.h
> > @@ -31,6 +31,5 @@ void spapr_dt_persistent_memory(SpaprMachineState *spapr, 
> > void *fdt);
> >  bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice 
> > *nvdimm,
> >                             uint64_t size, Error **errp);
> >  void spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp);
> > -void spapr_create_nvdimm_dr_connectors(SpaprMachineState *spapr);
> >  
> >  #endif
> > 
> > 
>

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