162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2009 Freescale Semiconductor, Inc.
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*
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* provides masks and opcode images for use by code generation, emulation
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* and for instructions that older assemblers might not know about
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*/
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#ifndef _ASM_POWERPC_DBELL_H
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#define _ASM_POWERPC_DBELL_H
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <asm/cputhreads.h>
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#include <asm/ppc-opcode.h>
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#include <asm/feature-fixups.h>
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#include <asm/kvm_ppc.h>
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#define PPC_DBELL_MSG_BRDCAST (0x04000000)
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#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
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#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
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#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
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#define PPC_DBELL_PIR_MASK 0x3fff
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enum ppc_dbell {
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PPC_DBELL = 0, /* doorbell */
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PPC_DBELL_CRIT = 1, /* critical doorbell */
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PPC_G_DBELL = 2, /* guest doorbell */
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PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
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PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
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PPC_DBELL_SERVER = 5, /* doorbell on server */
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};
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#ifdef CONFIG_PPC_BOOK3S
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#define PPC_DBELL_MSGTYPE PPC_DBELL_SERVER
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static inline void _ppc_msgsnd(u32 msg)
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{
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__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
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: : "i" (CPU_FTR_HVMODE), "r" (msg));
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}
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/* sync before sending message */
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static inline void ppc_msgsnd_sync(void)
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{
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__asm__ __volatile__ ("sync" : : : "memory");
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}
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/* sync after taking message interrupt */
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static inline void ppc_msgsync(void)
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{
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/* sync is not required when taking messages from the same core */
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__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0)
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: : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300));
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}
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static inline void _ppc_msgclr(u32 msg)
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{
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__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGCLR(%1), PPC_MSGCLRP(%1), %0)
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: : "i" (CPU_FTR_HVMODE), "r" (msg));
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}
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static inline void ppc_msgclr(enum ppc_dbell type)
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{
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u32 msg = PPC_DBELL_TYPE(type);
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_ppc_msgclr(msg);
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}
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#else /* CONFIG_PPC_BOOK3S */
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#define PPC_DBELL_MSGTYPE PPC_DBELL
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static inline void _ppc_msgsnd(u32 msg)
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{
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__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
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}
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/* sync before sending message */
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static inline void ppc_msgsnd_sync(void)
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{
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__asm__ __volatile__ ("sync" : : : "memory");
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}
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/* sync after taking message interrupt */
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static inline void ppc_msgsync(void)
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{
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}
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#endif /* CONFIG_PPC_BOOK3S */
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extern void doorbell_exception(struct pt_regs *regs);
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static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
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{
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u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
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(tag & 0x07ffffff);
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_ppc_msgsnd(msg);
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}
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#ifdef CONFIG_SMP
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/*
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* Doorbells must only be used if CPU_FTR_DBELL is available.
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* msgsnd is used in HV, and msgsndp is used in !HV.
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*
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* These should be used by platform code that is aware of restrictions.
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* Other arch code should use ->cause_ipi.
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*
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* doorbell_global_ipi() sends a dbell to any target CPU.
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* Must be used only by architectures that address msgsnd target
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* by PIR/get_hard_smp_processor_id.
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*/
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static inline void doorbell_global_ipi(int cpu)
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{
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u32 tag = get_hard_smp_processor_id(cpu);
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kvmppc_set_host_ipi(cpu);
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/* Order previous accesses vs. msgsnd, which is treated as a store */
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ppc_msgsnd_sync();
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ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
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}
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/*
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* doorbell_core_ipi() sends a dbell to a target CPU in the same core.
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* Must be used only by architectures that address msgsnd target
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* by TIR/cpu_thread_in_core.
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*/
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static inline void doorbell_core_ipi(int cpu)
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{
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u32 tag = cpu_thread_in_core(cpu);
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kvmppc_set_host_ipi(cpu);
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/* Order previous accesses vs. msgsnd, which is treated as a store */
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ppc_msgsnd_sync();
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ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
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}
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/*
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* Attempt to cause a core doorbell if destination is on the same core.
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* Returns 1 on success, 0 on failure.
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*/
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static inline int doorbell_try_core_ipi(int cpu)
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{
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int this_cpu = get_cpu();
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int ret = 0;
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if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) {
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doorbell_core_ipi(cpu);
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ret = 1;
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}
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put_cpu();
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return ret;
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}
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#endif /* CONFIG_SMP */
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#endif /* _ASM_POWERPC_DBELL_H */
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