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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright 2009 Freescale Semiconductor, Inc.
*
* provides masks and opcode images for use by code generation, emulation
* and for instructions that older assemblers might not know about
*/
#ifndef _ASM_POWERPC_DBELL_H
#define _ASM_POWERPC_DBELL_H
#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))
#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
#define PPC_DBELL_PIR_MASK 0x3fff
enum ppc_dbell {
PPC_DBELL = 0, /* doorbell */
PPC_DBELL_CRIT = 1, /* critical doorbell */
PPC_G_DBELL = 2, /* guest doorbell */
PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
PPC_DBELL_SERVER = 5, /* doorbell on server */
};
#ifdef CONFIG_PPC_BOOK3S
#define PPC_DBELL_MSGTYPE PPC_DBELL_SERVER
static inline void _ppc_msgsnd(u32 msg)
{
__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
: : "i" (CPU_FTR_HVMODE), "r" (msg));
}
/* sync before sending message */
static inline void ppc_msgsnd_sync(void)
{
__asm__ __volatile__ ("sync" : : : "memory");
}
/* sync after taking message interrupt */
static inline void ppc_msgsync(void)
{
/* sync is not required when taking messages from the same core */
__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0)
: : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300));
}
static inline void _ppc_msgclr(u32 msg)
{
__asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGCLR(%1), PPC_MSGCLRP(%1), %0)
: : "i" (CPU_FTR_HVMODE), "r" (msg));
}
static inline void ppc_msgclr(enum ppc_dbell type)
{
u32 msg = PPC_DBELL_TYPE(type);
_ppc_msgclr(msg);
}
#else /* CONFIG_PPC_BOOK3S */
#define PPC_DBELL_MSGTYPE PPC_DBELL
static inline void _ppc_msgsnd(u32 msg)
{
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
}
/* sync before sending message */
static inline void ppc_msgsnd_sync(void)
{
__asm__ __volatile__ ("sync" : : : "memory");
}
/* sync after taking message interrupt */
static inline void ppc_msgsync(void)
{
}
#endif /* CONFIG_PPC_BOOK3S */
extern void doorbell_exception(struct pt_regs *regs);
static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
{
u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
(tag & 0x07ffffff);
_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 */
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