Re: [PATCH 04/13] ppc/pnv: Introduce PnvMachineClass and PnvMachineClass::compat

[Greg Kurz <groug@kaod.org>]

On Fri, 13 Dec 2019 13:44:48 +0100
Cédric Le Goater <clg@kaod.org> wrote:

> On 13/12/2019 12:59, Greg Kurz wrote:
> > The pnv_dt_create() function generates different contents for the
> > "compatible" property of the root node in the DT, depending on the
> > CPU type. This is open coded with multiple ifs using pnv_is_powerXX()
> > helpers.
> > 
> > It seems cleaner to achieve with QOM. Introduce a base class for the
> > powernv machine and a compat attribute that each child class can use
> > to provide the value for the "compatible" property.
> > 
> > Signed-off-by: Greg Kurz <groug@kaod.org>
> 
> Reviewed-by: Cédric Le Goater <clg@kaod.org>
> 
> 
> > ---
> >  hw/ppc/pnv.c         |   33 +++++++++++++++++++--------------
> >  include/hw/ppc/pnv.h |   13 +++++++++++++
> >  2 files changed, 32 insertions(+), 14 deletions(-)
> > 
> > diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> > index 0be0b6b411c3..5ac149b149d8 100644
> > --- a/hw/ppc/pnv.c
> > +++ b/hw/ppc/pnv.c
> > @@ -484,9 +484,7 @@ static void pnv_dt_power_mgt(void *fdt)
> >  
> >  static void *pnv_dt_create(MachineState *machine)
> >  {
> > -    const char plat_compat8[] = "qemu,powernv8\0qemu,powernv\0ibm,powernv";
> > -    const char plat_compat9[] = "qemu,powernv9\0ibm,powernv";
> > -    const char plat_compat10[] = "qemu,powernv10\0ibm,powernv";
> > +    PnvMachineClass *pmc = PNV_MACHINE_GET_CLASS(machine);
> >      PnvMachineState *pnv = PNV_MACHINE(machine);
> >      void *fdt;
> >      char *buf;
> > @@ -504,17 +502,8 @@ static void *pnv_dt_create(MachineState *machine)
> >      _FDT((fdt_setprop_cell(fdt, 0, "#size-cells", 0x2)));
> >      _FDT((fdt_setprop_string(fdt, 0, "model",
> >                               "IBM PowerNV (emulated by qemu)")));
> > -    if (pnv_is_power10(pnv)) {
> > -        _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat10,
> > -                          sizeof(plat_compat10))));
> > -    } else if (pnv_is_power9(pnv)) {
> > -        _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat9,
> > -                          sizeof(plat_compat9))));
> > -    } else {
> > -        _FDT((fdt_setprop(fdt, 0, "compatible", plat_compat8,
> > -                          sizeof(plat_compat8))));
> > -    }
> > -
> > +    _FDT((fdt_setprop(fdt, 0, "compatible", pmc->compat,
> > +                      sizeof(pmc->compat))));

Of course the size should be pmc->compat_size ... David, can you fix this
in your tree or should I post a v2 ?

> >  
> >      buf =  qemu_uuid_unparse_strdup(&qemu_uuid);
> >      _FDT((fdt_setprop_string(fdt, 0, "vm,uuid", buf)));
> > @@ -1692,6 +1681,8 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
> >  {
> >      MachineClass *mc = MACHINE_CLASS(oc);
> >      XICSFabricClass *xic = XICS_FABRIC_CLASS(oc);
> > +    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
> > +    static const char compat[] = "qemu,powernv8\0qemu,powernv\0ibm,powernv";
> >  
> >      mc->desc = "IBM PowerNV (Non-Virtualized) POWER8";
> >      mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0");
> > @@ -1699,26 +1690,39 @@ static void pnv_machine_power8_class_init(ObjectClass *oc, void *data)
> >      xic->icp_get = pnv_icp_get;
> >      xic->ics_get = pnv_ics_get;
> >      xic->ics_resend = pnv_ics_resend;
> > +
> > +    pmc->compat = compat;
> > +    pmc->compat_size = sizeof(compat);
> >  }
> >  
> >  static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
> >  {
> >      MachineClass *mc = MACHINE_CLASS(oc);
> >      XiveFabricClass *xfc = XIVE_FABRIC_CLASS(oc);
> > +    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
> > +    static const char compat[] = "qemu,powernv9\0ibm,powernv";
> >  
> >      mc->desc = "IBM PowerNV (Non-Virtualized) POWER9";
> >      mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power9_v2.0");
> >      xfc->match_nvt = pnv_match_nvt;
> >  
> >      mc->alias = "powernv";
> > +
> > +    pmc->compat = compat;
> > +    pmc->compat_size = sizeof(compat);
> >  }
> >  
> >  static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)
> >  {
> >      MachineClass *mc = MACHINE_CLASS(oc);
> > +    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
> > +    static const char compat[] = "qemu,powernv10\0ibm,powernv";
> >  
> >      mc->desc = "IBM PowerNV (Non-Virtualized) POWER10";
> >      mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power10_v1.0");
> > +
> > +    pmc->compat = compat;
> > +    pmc->compat_size = sizeof(compat);
> >  }
> >  
> >  static void pnv_machine_class_init(ObjectClass *oc, void *data)
> > @@ -1796,6 +1800,7 @@ static const TypeInfo types[] = {
> >          .instance_size = sizeof(PnvMachineState),
> >          .instance_init = pnv_machine_instance_init,
> >          .class_init    = pnv_machine_class_init,
> > +        .class_size    = sizeof(PnvMachineClass),
> >          .interfaces = (InterfaceInfo[]) {
> >              { TYPE_INTERRUPT_STATS_PROVIDER },
> >              { },
> > diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> > index 92f80b1ccead..d534746bd493 100644
> > --- a/include/hw/ppc/pnv.h
> > +++ b/include/hw/ppc/pnv.h
> > @@ -185,6 +185,19 @@ PowerPCCPU *pnv_chip_find_cpu(PnvChip *chip, uint32_t pir);
> >  #define TYPE_PNV_MACHINE       MACHINE_TYPE_NAME("powernv")
> >  #define PNV_MACHINE(obj) \
> >      OBJECT_CHECK(PnvMachineState, (obj), TYPE_PNV_MACHINE)
> > +#define PNV_MACHINE_GET_CLASS(obj) \
> > +    OBJECT_GET_CLASS(PnvMachineClass, obj, TYPE_PNV_MACHINE)
> > +#define PNV_MACHINE_CLASS(klass) \
> > +    OBJECT_CLASS_CHECK(PnvMachineClass, klass, TYPE_PNV_MACHINE)
> > +
> > +typedef struct PnvMachineClass {
> > +    /*< private >*/
> > +    MachineClass parent_class;
> > +
> > +    /*< public >*/
> > +    const char *compat;
> > +    int compat_size;
> > +} PnvMachineClass;
> >  
> >  typedef struct PnvMachineState {
> >      /*< private >*/
> > 
> 
>