Re: [Qemu-devel] [PATCH 18/23] ppc: pnv: use generic cpu_model parsing

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 6 Oct 2017 19:34:19 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Thu, Oct 05, 2017 at 06:24:45PM +0200, Igor Mammedov wrote:
> > use common cpu_model prasing in vl.c and set default cpu_model
> > using generic MachineClass::default_cpu_type.
> > 
> > Beside of switching to generic infrastructure it solves several
> > issues.
> > 
> >  * ppc_cpu_class_by_name() is used to deal with lower/upper case
> >    and alias translations into actual cpu type, which fixes
> >     '-M powernv -cpu power8' and '-M powernv -cpu power9_v1.0'
> >    usecases which error out with:
> >     'invalid CPU model 'FOO' for powernv machine'
> >  * allows to switch to lower-case typenames in pnv chip/core name
> >    (by convention typnames should be lower-case)
> >  * replace aliased names /power8, power9, .../ with exact cpu model
> >    names (i.e. typenames should be stable but aliases might decide to
> >    point to other cpu model withi family or changed by kvm). It will
> >    also help to simplify pnv_chip/core code and get rid of dependency
> >    on cpu_model parsing.
> > 
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ---
> >  include/hw/ppc/pnv.h |  8 ++++----
> >  hw/ppc/pnv.c         | 22 ++++++++++------------
> >  hw/ppc/pnv_core.c    |  2 +-
> >  3 files changed, 15 insertions(+), 17 deletions(-)
> > 
> > diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> > index 9c5437d..2525f7f 100644
> > --- a/include/hw/ppc/pnv.h
> > +++ b/include/hw/ppc/pnv.h
> > @@ -80,19 +80,19 @@ typedef struct PnvChipClass {
> >      uint32_t (*core_pir)(PnvChip *chip, uint32_t core_id);
> >  } PnvChipClass;
> >  
> > -#define TYPE_PNV_CHIP_POWER8E TYPE_PNV_CHIP "-POWER8E"
> > +#define TYPE_PNV_CHIP_POWER8E TYPE_PNV_CHIP "-power8e_v2.1"
> >  #define PNV_CHIP_POWER8E(obj) \
> >      OBJECT_CHECK(PnvChip, (obj), TYPE_PNV_CHIP_POWER8E)
> >  
> > -#define TYPE_PNV_CHIP_POWER8 TYPE_PNV_CHIP "-POWER8"
> > +#define TYPE_PNV_CHIP_POWER8 TYPE_PNV_CHIP "-power8_v2.0"
> >  #define PNV_CHIP_POWER8(obj) \
> >      OBJECT_CHECK(PnvChip, (obj), TYPE_PNV_CHIP_POWER8)
> >  
> > -#define TYPE_PNV_CHIP_POWER8NVL TYPE_PNV_CHIP "-POWER8NVL"
> > +#define TYPE_PNV_CHIP_POWER8NVL TYPE_PNV_CHIP "-power8nvl_v1.0"
> >  #define PNV_CHIP_POWER8NVL(obj) \
> >      OBJECT_CHECK(PnvChip, (obj), TYPE_PNV_CHIP_POWER8NVL)
> >  
> > -#define TYPE_PNV_CHIP_POWER9 TYPE_PNV_CHIP "-POWER9"
> > +#define TYPE_PNV_CHIP_POWER9 TYPE_PNV_CHIP "-power9_v1.0"  
> 
> Uh.. we really should add a DD2 power9 before we make this change.
> Making a DD1.0 (read, buggy as hell) chip the default is not
> sensible.  Especially since we don't implement the various DD1 bugs
> and differences in qemu.
I guess pnv owner will have to it,
I can't help here /me uses whatever is in code right now/

btw: in my tests when booting machine with power9, qemu crashes
(it happens on master as well, so this series in not to blame)

> 
> >  #define PNV_CHIP_POWER9(obj) \
> >      OBJECT_CHECK(PnvChip, (obj), TYPE_PNV_CHIP_POWER9)
> >  
> > diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> > index d46d91c..4169837 100644
> > --- a/hw/ppc/pnv.c
> > +++ b/hw/ppc/pnv.c
> > @@ -607,16 +607,13 @@ static void ppc_powernv_init(MachineState *machine)
> >          }
> >      }
> >  
> > -    /* We need some cpu model to instantiate the PnvChip class */
> > -    if (machine->cpu_model == NULL) {
> > -        machine->cpu_model = "POWER8";
> > -    }
> > -
> >      /* Create the processor chips */
> > -    chip_typename = g_strdup_printf(TYPE_PNV_CHIP "-%s", machine->cpu_model);
> > +    i = strlen(machine->cpu_type) - strlen(POWERPC_CPU_TYPE_SUFFIX);
> > +    chip_typename = g_strdup_printf(TYPE_PNV_CHIP "-%.*s",
> > +                                    i, machine->cpu_type);
> >      if (!object_class_by_name(chip_typename)) {
> > -        error_report("invalid CPU model '%s' for %s machine",
> > -                     machine->cpu_model, MACHINE_GET_CLASS(machine)->name);
> > +        error_report("invalid CPU model '%.*s' for %s machine",
> > +                     i, machine->cpu_type, MACHINE_GET_CLASS(machine)->name);
> >          exit(1);
> >      }
> >  
> > @@ -716,7 +713,7 @@ static void pnv_chip_power8e_class_init(ObjectClass *klass, void *data)
> >      DeviceClass *dc = DEVICE_CLASS(klass);
> >      PnvChipClass *k = PNV_CHIP_CLASS(klass);
> >  
> > -    k->cpu_model = "POWER8E";
> > +    k->cpu_model = "power8e_v2.1";
> >      k->chip_type = PNV_CHIP_POWER8E;
> >      k->chip_cfam_id = 0x221ef04980000000ull;  /* P8 Murano DD2.1 */
> >      k->cores_mask = POWER8E_CORE_MASK;
> > @@ -738,7 +735,7 @@ static void pnv_chip_power8_class_init(ObjectClass *klass, void *data)
> >      DeviceClass *dc = DEVICE_CLASS(klass);
> >      PnvChipClass *k = PNV_CHIP_CLASS(klass);
> >  
> > -    k->cpu_model = "POWER8";
> > +    k->cpu_model = "power8_v2.0";
> >      k->chip_type = PNV_CHIP_POWER8;
> >      k->chip_cfam_id = 0x220ea04980000000ull; /* P8 Venice DD2.0 */
> >      k->cores_mask = POWER8_CORE_MASK;
> > @@ -760,7 +757,7 @@ static void pnv_chip_power8nvl_class_init(ObjectClass *klass, void *data)
> >      DeviceClass *dc = DEVICE_CLASS(klass);
> >      PnvChipClass *k = PNV_CHIP_CLASS(klass);
> >  
> > -    k->cpu_model = "POWER8NVL";
> > +    k->cpu_model = "power8nvl_v1.0";
> >      k->chip_type = PNV_CHIP_POWER8NVL;
> >      k->chip_cfam_id = 0x120d304980000000ull;  /* P8 Naples DD1.0 */
> >      k->cores_mask = POWER8_CORE_MASK;
> > @@ -782,7 +779,7 @@ static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
> >      DeviceClass *dc = DEVICE_CLASS(klass);
> >      PnvChipClass *k = PNV_CHIP_CLASS(klass);
> >  
> > -    k->cpu_model = "POWER9";
> > +    k->cpu_model = "power9_v1.0";
> >      k->chip_type = PNV_CHIP_POWER9;
> >      k->chip_cfam_id = 0x100d104980000000ull; /* P9 Nimbus DD1.0 */
> >      k->cores_mask = POWER9_CORE_MASK;
> > @@ -1133,6 +1130,7 @@ static void powernv_machine_class_init(ObjectClass *oc, void *data)
> >      mc->init = ppc_powernv_init;
> >      mc->reset = ppc_powernv_reset;
> >      mc->max_cpus = MAX_CPUS;
> > +    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0");
> >      mc->block_default_type = IF_IDE; /* Pnv provides a AHCI device for
> >                                        * storage */
> >      mc->no_parallel = 1;
> > diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
> > index 6726483..44b0b24 100644
> > --- a/hw/ppc/pnv_core.c
> > +++ b/hw/ppc/pnv_core.c
> > @@ -227,7 +227,7 @@ static const TypeInfo pnv_core_info = {
> >  };
> >  
> >  static const char *pnv_core_models[] = {
> > -    "POWER8E", "POWER8", "POWER8NVL", "POWER9"
> > +    "power8e_v2.1", "power8_v2.0", "power8nvl_v1.0", "power9_v1.0"
> >  };
> >  
> >  static void pnv_core_register_types(void)  
>