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powerpc: Inline doorbell sending functions

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These are only called in one place for a given platform, so inline
them for performance.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Cédric Le Goater <clg@kaod.org>
[mpe: Fix build errors related to KVM]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200726035155.1424103-2-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-07-26 13:51:53 +10:00 committed by Michael Ellerman
parent 443359aebc
commit 1f0ce49743
3 changed files with 63 additions and 58 deletions
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64
arch/powerpc/include/asm/dbell.h
View File

@ -11,8 +11,10 @@
#include <linux/smp.h>
#include <linux/threads.h>
#include <asm/cputhreads.h>
#include <asm/ppc-opcode.h>
#include <asm/feature-fixups.h>
#include <asm/kvm_ppc.h>
#define PPC_DBELL_MSG_BRDCAST (0x04000000)
#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
@ -87,9 +89,6 @@ static inline void ppc_msgsync(void)
#endif /* CONFIG_PPC_BOOK3S */
extern void doorbell_global_ipi(int cpu);
extern void doorbell_core_ipi(int cpu);
extern int doorbell_try_core_ipi(int cpu);
extern void doorbell_exception(struct pt_regs *regs);
static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
@ -100,4 +99,63 @@ static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
_ppc_msgsnd(msg);
}
#ifdef CONFIG_SMP
/*
* 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.
*/
static inline void doorbell_global_ipi(int cpu)
{
u32 tag = get_hard_smp_processor_id(cpu);
kvmppc_set_host_ipi(cpu);
/* Order previous accesses vs. msgsnd, which is treated as a store */
ppc_msgsnd_sync();
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.
*/
static inline void doorbell_core_ipi(int cpu)
{
u32 tag = cpu_thread_in_core(cpu);
kvmppc_set_host_ipi(cpu);
/* Order previous accesses vs. msgsnd, which is treated as a store */
ppc_msgsnd_sync();
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.
*/
static inline 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;
}
#endif /* CONFIG_SMP */
#endif /* _ASM_POWERPC_DBELL_H */

2
arch/powerpc/include/asm/kvm_booke.h
View File

@ -89,10 +89,12 @@ static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
return vcpu->arch.regs.nip;
}
#ifdef CONFIG_BOOKE
static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
{
return vcpu->arch.fault_dear;
}
#endif
static inline bool kvmppc_supports_magic_page(struct kvm_vcpu *vcpu)
{

55
arch/powerpc/kernel/dbell.c
View File

@ -18,61 +18,6 @@
#ifdef CONFIG_SMP
/*
* 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);
/* Order previous accesses vs. msgsnd, which is treated as a store */
ppc_msgsnd_sync();
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);
/* Order previous accesses vs. msgsnd, which is treated as a store */
ppc_msgsnd_sync();
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)
{
struct pt_regs *old_regs = set_irq_regs(regs);