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MIPS: kexec: Make a framework for both jumping and halting on nonboot CPUs

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The existing implementation lets machine_kexec() CPU jump to reboot code
buffer, whereas other CPUs to relocated_kexec_smp_wait. The natural way to
bring up an SMP new kernel would be to let CPU0 do it while others being
halted. For those failing to do so, fall back to the jumping method.

Signed-off-by: Dengcheng Zhu <dzhu@wavecomp.com>
[paul.burton@mips.com: Guard kexec_nonboot_cpu_jump with CONFIG_SMP]
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20570/
Cc: pburton@wavecomp.com
Cc: ralf@linux-mips.org
Cc: linux-mips@linux-mips.org
Cc: rachel.mozes@intel.com
This commit is contained in:
Dengcheng Zhu
2018-09-11 14:49:21 -07:00
committed by Paul Burton
parent dc57aaf95a
commit 62cac480f3
8 changed files with 126 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/mips/include/asm/kexec.h
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@@ -39,11 +39,12 @@ extern unsigned long kexec_args[4];
extern int (*_machine_kexec_prepare)(struct kimage *);
extern void (*_machine_kexec_shutdown)(void);
extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
extern void default_machine_crash_shutdown(struct pt_regs *regs);
void default_machine_crash_shutdown(struct pt_regs *regs);
void kexec_nonboot_cpu_jump(void);
void kexec_reboot(void);
#ifdef CONFIG_SMP
extern const unsigned char kexec_smp_wait[];
extern unsigned long secondary_kexec_args[4];
extern void (*relocated_kexec_smp_wait) (void *);
extern atomic_t kexec_ready_to_reboot;
extern void (*_crash_smp_send_stop)(void);
#endif

3
arch/mips/include/asm/smp-ops.h
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@@ -33,6 +33,9 @@ struct plat_smp_ops {
int (*cpu_disable)(void);
void (*cpu_die)(unsigned int cpu);
#endif
#ifdef CONFIG_KEXEC
void (*kexec_nonboot_cpu)(void);
#endif
};
extern void register_smp_ops(const struct plat_smp_ops *ops);

16
arch/mips/include/asm/smp.h
View File

@@ -91,6 +91,22 @@ static inline void __cpu_die(unsigned int cpu)
extern void play_dead(void);
#endif
#ifdef CONFIG_KEXEC
static inline void kexec_nonboot_cpu(void)
{
extern const struct plat_smp_ops *mp_ops; /* private */
return mp_ops->kexec_nonboot_cpu();
}
static inline void *kexec_nonboot_cpu_func(void)
{
extern const struct plat_smp_ops *mp_ops; /* private */
return mp_ops->kexec_nonboot_cpu;
}
#endif
/*
* This function will set up the necessary IPIs for Linux to communicate
* with the CPUs in mask.