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powerpc: Change the doorbell IPI calling convention

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Change the doorbell callers to know about their msgsnd addressing,
rather than have them set a per-cpu target data tag at boot that gets
sent to the cause_ipi functions. The data is only used for doorbell IPI
functions, no other IPI types, so it makes sense to keep that detail
local to doorbell.

Have the platform code understand doorbell IPIs, rather than the
interrupt controller code understand them. Platform code can look at
capabilities it has available and decide which to use.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2017-04-13 20:16:21 +10:00
committed by Michael Ellerman
parent 9b7ff0c658
commit b866cc2199
14 changed files with 95 additions and 82 deletions
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58
arch/powerpc/kernel/dbell.c
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@@ -20,18 +20,60 @@
#include <asm/kvm_ppc.h>
#ifdef CONFIG_SMP
void doorbell_setup_this_cpu(void)
{
unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK;
smp_muxed_ipi_set_data(smp_processor_id(), tag);
}
void doorbell_cause_ipi(int cpu, unsigned long data)
/*
* Doorbells must only be used if CPU_FTR_DBELL is available.
* msgsnd is used in HV, and msgsndp is used in !HV.
*
* These should be used by platform code that is aware of restrictions.
* Other arch code should use ->cause_ipi.
*
* doorbell_global_ipi() sends a dbell to any target CPU.
* Must be used only by architectures that address msgsnd target
* by PIR/get_hard_smp_processor_id.
*/
void doorbell_global_ipi(int cpu)
{
u32 tag = get_hard_smp_processor_id(cpu);
kvmppc_set_host_ipi(cpu, 1);
/* Order previous accesses vs. msgsnd, which is treated as a store */
mb();
ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data);
ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
}
/*
* doorbell_core_ipi() sends a dbell to a target CPU in the same core.
* Must be used only by architectures that address msgsnd target
* by TIR/cpu_thread_in_core.
*/
void doorbell_core_ipi(int cpu)
{
u32 tag = cpu_thread_in_core(cpu);
kvmppc_set_host_ipi(cpu, 1);
/* Order previous accesses vs. msgsnd, which is treated as a store */
mb();
ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
}
/*
* Attempt to cause a core doorbell if destination is on the same core.
* Returns 1 on success, 0 on failure.
*/
int doorbell_try_core_ipi(int cpu)
{
int this_cpu = get_cpu();
int ret = 0;
if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) {
doorbell_core_ipi(cpu);
ret = 1;
}
put_cpu();
return ret;
}
void doorbell_exception(struct pt_regs *regs)