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ppc/xics: introduce an 'intc' backlink under PowerPCCPU

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Today, the ICPState array of the sPAPR machine is indexed with
'cpu_index' of the CPUState. This numbering of CPUs is internal to
QEMU and the guest only knows about what is exposed in the device
tree, that is the 'cpu_dt_id'. This is why sPAPR uses the helper
xics_get_cpu_index_by_dt_id() to do the mapping in a couple of places.

To provide a more generic XICS layer, we need to abstract the IRQ
'server' number and remove any assumption made on its nature. It
should not be used as a 'cpu_index' for lookups like xics_cpu_setup()
and xics_cpu_destroy() do.

To reach that goal, we choose to introduce a generic 'intc' backlink
under PowerPCCPU, and let the machine core init routine do the
ICPState lookup. The resulting object is passed on to xics_cpu_setup()
which does the store under PowerPCCPU. The IRQ 'server' number in XICS
is now generic. sPAPR uses 'cpu_dt_id' and PowerNV will use 'PIR'
number.

This also has the benefit of simplifying the sPAPR hcall routines
which do not need to do any ICPState lookups anymore.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2017-03-29 15:53:23 +02:00 • committed by David Gibson
parent ccd531b9c9
commit ad5d1add86
5 changed files with 13 additions and 20 deletions
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4
hw/ppc/spapr_cpu_core.c
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@ -63,6 +63,8 @@ static void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu,
Error **errp)
{
CPUPPCState *env = &cpu->env;
XICSFabric *xi = XICS_FABRIC(spapr);
ICPState *icp = xics_icp_get(xi, CPU(cpu)->cpu_index);
/* Set time-base frequency to 512 MHz */
cpu_ppc_tb_init(env, SPAPR_TIMEBASE_FREQ);
@ -80,7 +82,7 @@ static void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu,
}
}
xics_cpu_setup(XICS_FABRIC(spapr), cpu);
xics_cpu_setup(xi, cpu, icp);
qemu_register_reset(spapr_cpu_reset, cpu);
spapr_cpu_reset(cpu);