linux_dsm_epyc7002/arch/riscv/include/asm/smp.h
Anup Patel 5cf998ba8c
RISC-V: self-contained IPI handling routine
Currently, the IPI handling routine riscv_software_interrupt() does
not take any argument and also does not perform irq_enter()/irq_exit().

This patch makes IPI handling routine more self-contained by:
1. Passing "pt_regs *" argument
2. Explicitly doing irq_enter()/irq_exit()
3. Explicitly save/restore "pt_regs *" using set_irq_regs()

With above changes, IPI handling routine does not depend on caller
function to perform irq_enter()/irq_exit() and save/restore of
"pt_regs *" hence its more self-contained. This also enables us
to call IPI handling routine from IRQCHIP drivers.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
2020-06-09 19:11:19 -07:00

93 lines
2.1 KiB
C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Regents of the University of California
*/
#ifndef _ASM_RISCV_SMP_H
#define _ASM_RISCV_SMP_H
#include <linux/cpumask.h>
#include <linux/irqreturn.h>
#include <linux/thread_info.h>
#define INVALID_HARTID ULONG_MAX
struct seq_file;
extern unsigned long boot_cpu_hartid;
#ifdef CONFIG_SMP
/*
* Mapping between linux logical cpu index and hartid.
*/
extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
#define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu]
/* print IPI stats */
void show_ipi_stats(struct seq_file *p, int prec);
/* SMP initialization hook for setup_arch */
void __init setup_smp(void);
/* Called from C code, this handles an IPI. */
void handle_IPI(struct pt_regs *regs);
/* Hook for the generic smp_call_function_many() routine. */
void arch_send_call_function_ipi_mask(struct cpumask *mask);
/* Hook for the generic smp_call_function_single() routine. */
void arch_send_call_function_single_ipi(int cpu);
int riscv_hartid_to_cpuid(int hartid);
void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
/*
* Obtains the hart ID of the currently executing task. This relies on
* THREAD_INFO_IN_TASK, but we define that unconditionally.
*/
#define raw_smp_processor_id() (current_thread_info()->cpu)
#if defined CONFIG_HOTPLUG_CPU
int __cpu_disable(void);
void __cpu_die(unsigned int cpu);
void cpu_stop(void);
#else
#endif /* CONFIG_HOTPLUG_CPU */
#else
static inline void show_ipi_stats(struct seq_file *p, int prec)
{
}
static inline int riscv_hartid_to_cpuid(int hartid)
{
if (hartid == boot_cpu_hartid)
return 0;
return -1;
}
static inline unsigned long cpuid_to_hartid_map(int cpu)
{
return boot_cpu_hartid;
}
static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
struct cpumask *out)
{
cpumask_clear(out);
cpumask_set_cpu(boot_cpu_hartid, out);
}
#endif /* CONFIG_SMP */
#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
bool cpu_has_hotplug(unsigned int cpu);
#else
static inline bool cpu_has_hotplug(unsigned int cpu)
{
return false;
}
#endif
#endif /* _ASM_RISCV_SMP_H */