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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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6
hw/intc/xics.c
View File

@ -52,7 +52,7 @@ int xics_get_cpu_index_by_dt_id(int cpu_dt_id)
void xics_cpu_destroy(XICSFabric *xi, PowerPCCPU *cpu)
{
CPUState *cs = CPU(cpu);
ICPState *icp = xics_icp_get(xi, cs->cpu_index);
ICPState *icp = ICP(cpu->intc);
assert(icp);
assert(cs == icp->cs);
@ -61,15 +61,15 @@ void xics_cpu_destroy(XICSFabric *xi, PowerPCCPU *cpu)
icp->cs = NULL;
}
void xics_cpu_setup(XICSFabric *xi, PowerPCCPU *cpu)
void xics_cpu_setup(XICSFabric *xi, PowerPCCPU *cpu, ICPState *icp)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
ICPState *icp = xics_icp_get(xi, cs->cpu_index);
ICPStateClass *icpc;
assert(icp);
cpu->intc = OBJECT(icp);
icp->cs = cs;
icpc = ICP_GET_CLASS(icp);

20
hw/intc/xics_spapr.c
View File

@ -43,11 +43,9 @@
static target_ulong h_cppr(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
CPUState *cs = CPU(cpu);
ICPState *icp = xics_icp_get(XICS_FABRIC(spapr), cs->cpu_index);
target_ulong cppr = args[0];
icp_set_cppr(icp, cppr);
icp_set_cppr(ICP(cpu->intc), cppr);
return H_SUCCESS;
}
@ -69,9 +67,7 @@ static target_ulong h_ipi(PowerPCCPU *cpu, sPAPRMachineState *spapr,
static target_ulong h_xirr(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
CPUState *cs = CPU(cpu);
ICPState *icp = xics_icp_get(XICS_FABRIC(spapr), cs->cpu_index);
uint32_t xirr = icp_accept(icp);
uint32_t xirr = icp_accept(ICP(cpu->intc));
args[0] = xirr;
return H_SUCCESS;
@ -80,9 +76,7 @@ static target_ulong h_xirr(PowerPCCPU *cpu, sPAPRMachineState *spapr,
static target_ulong h_xirr_x(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
CPUState *cs = CPU(cpu);
ICPState *icp = xics_icp_get(XICS_FABRIC(spapr), cs->cpu_index);
uint32_t xirr = icp_accept(icp);
uint32_t xirr = icp_accept(ICP(cpu->intc));
args[0] = xirr;
args[1] = cpu_get_host_ticks();
@ -92,21 +86,17 @@ static target_ulong h_xirr_x(PowerPCCPU *cpu, sPAPRMachineState *spapr,
static target_ulong h_eoi(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
CPUState *cs = CPU(cpu);
ICPState *icp = xics_icp_get(XICS_FABRIC(spapr), cs->cpu_index);
target_ulong xirr = args[0];
icp_eoi(icp, xirr);
icp_eoi(ICP(cpu->intc), xirr);
return H_SUCCESS;
}
static target_ulong h_ipoll(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
CPUState *cs = CPU(cpu);
ICPState *icp = xics_icp_get(XICS_FABRIC(spapr), cs->cpu_index);
uint32_t mfrr;
uint32_t xirr = icp_ipoll(icp, &mfrr);
uint32_t xirr = icp_ipoll(ICP(cpu->intc), &mfrr);
args[0] = xirr;
args[1] = mfrr;

4
hw/ppc/spapr_cpu_core.c
View File

@ -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);

2
include/hw/ppc/xics.h
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@ -168,7 +168,7 @@ void spapr_dt_xics(int nr_servers, void *fdt, uint32_t phandle);
qemu_irq xics_get_qirq(XICSFabric *xi, int irq);
ICPState *xics_icp_get(XICSFabric *xi, int server);
void xics_cpu_setup(XICSFabric *xi, PowerPCCPU *cpu);
void xics_cpu_setup(XICSFabric *xi, PowerPCCPU *cpu, ICPState *icp);
void xics_cpu_destroy(XICSFabric *xi, PowerPCCPU *cpu);
/* Internal XICS interfaces */

1
target/ppc/cpu.h
View File

@ -1200,6 +1200,7 @@ struct PowerPCCPU {
uint32_t max_compat;
uint32_t compat_pvr;
PPCVirtualHypervisor *vhyp;
Object *intc;
/* Fields related to migration compatibility hacks */
bool pre_2_8_migration;