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| author |  Thomas Gleixner <tglx@linutronix.de>
| 2023-05-12 23:07:46 +0200 |
|---|---|---|
| committer |  Peter Zijlstra <peterz@infradead.org>
| 2023-05-15 13:45:01 +0200 |
| commit | 8b5a0f957cc5ca1f68486163d4da4683be3b47aa (patch) | |
| tree | 36d328208d183a30dc52126496e2bd16a498f336 /arch/x86/include/asm/smp.h | |
| parent | cpu/hotplug: Provide a split up CPUHP_BRINGUP mechanism (diff) | |
| download | linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.tar.gz linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.tar.bz2 linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.zip | |
x86/smpboot: Enable split CPU startup
The x86 CPU bringup state currently does AP wake-up, wait for AP to
respond and then release it for full bringup.
It is safe to be split into a wake-up and and a separate wait+release
state.
Provide the required functions and enable the split CPU bringup, which
prepares for parallel bringup, where the bringup of the non-boot CPUs takes
two iterations: One to prepare and wake all APs and the second to wait and
release them. Depending on timing this can eliminate the wait time
completely.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Helge Deller <deller@gmx.de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205257.133453992@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/smp.h')
| -rw-r--r-- | arch/x86/include/asm/smp.h | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 693c9997c069..726c2a243eb0 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -40,7 +40,7 @@ struct smp_ops { void (*cleanup_dead_cpu)(unsigned cpu); void (*poll_sync_state)(void); - int (*cpu_up)(unsigned cpu, struct task_struct *tidle); + int (*kick_ap_alive)(unsigned cpu, struct task_struct *tidle); int (*cpu_disable)(void); void (*cpu_die)(unsigned int cpu); void (*play_dead)(void); @@ -80,11 +80,6 @@ static inline void smp_cpus_done(unsigned int max_cpus) smp_ops.smp_cpus_done(max_cpus); } -static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle) -{ - return smp_ops.cpu_up(cpu, tidle); -} - static inline int __cpu_disable(void) { return smp_ops.cpu_disable(); @@ -124,7 +119,7 @@ void native_smp_prepare_cpus(unsigned int max_cpus); void calculate_max_logical_packages(void); void native_smp_cpus_done(unsigned int max_cpus); int common_cpu_up(unsigned int cpunum, struct task_struct *tidle); -int native_cpu_up(unsigned int cpunum, struct task_struct *tidle); +int native_kick_ap(unsigned int cpu, struct task_struct *tidle); int native_cpu_disable(void); void __noreturn hlt_play_dead(void); void native_play_dead(void); |