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Message-ID: <20230512205257.133453992@linutronix.de>
Date: Fri, 12 May 2023 23:07:46 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org, David Woodhouse <dwmw2@...radead.org>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Brian Gerst <brgerst@...il.com>,
Arjan van de Veen <arjan@...ux.intel.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Paul McKenney <paulmck@...nel.org>,
Tom Lendacky <thomas.lendacky@....com>,
Sean Christopherson <seanjc@...gle.com>,
Oleksandr Natalenko <oleksandr@...alenko.name>,
Paul Menzel <pmenzel@...gen.mpg.de>,
"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
Piotr Gorski <lucjan.lucjanov@...il.com>,
Usama Arif <usama.arif@...edance.com>,
Juergen Gross <jgross@...e.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
xen-devel@...ts.xenproject.org,
Russell King <linux@...linux.org.uk>,
Arnd Bergmann <arnd@...db.de>,
linux-arm-kernel@...ts.infradead.org,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
linux-csky@...r.kernel.org,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
linux-mips@...r.kernel.org,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
linux-riscv@...ts.infradead.org,
Mark Rutland <mark.rutland@....com>,
Sabin Rapan <sabrapan@...zon.com>,
"Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
Ross Philipson <ross.philipson@...cle.com>
Subject: [patch V4 31/37] x86/smpboot: Enable split CPU startup
From: Thomas Gleixner <tglx@...utronix.de>
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@...utronix.de>
Tested-by: Michael Kelley <mikelley@...rosoft.com>
---
arch/x86/Kconfig | 2 +-
arch/x86/include/asm/smp.h | 9 ++-------
arch/x86/kernel/smp.c | 2 +-
arch/x86/kernel/smpboot.c | 8 ++++----
arch/x86/xen/smp_pv.c | 4 ++--
5 files changed, 10 insertions(+), 15 deletions(-)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -274,8 +274,8 @@ config X86
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_USER_RETURN_NOTIFIER
select HAVE_GENERIC_VDSO
- select HOTPLUG_CORE_SYNC_FULL if SMP
select HOTPLUG_SMT if SMP
+ select HOTPLUG_SPLIT_STARTUP if SMP
select IRQ_FORCED_THREADING
select NEED_PER_CPU_EMBED_FIRST_CHUNK
select NEED_PER_CPU_PAGE_FIRST_CHUNK
--- 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(unsigne
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 in
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);
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -268,7 +268,7 @@ struct smp_ops smp_ops = {
#endif
.smp_send_reschedule = native_smp_send_reschedule,
- .cpu_up = native_cpu_up,
+ .kick_ap_alive = native_kick_ap,
.cpu_disable = native_cpu_disable,
.play_dead = native_play_dead,
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1052,7 +1052,7 @@ static int do_boot_cpu(int apicid, int c
return ret;
}
-static int native_kick_ap(unsigned int cpu, struct task_struct *tidle)
+int native_kick_ap(unsigned int cpu, struct task_struct *tidle)
{
int apicid = apic->cpu_present_to_apicid(cpu);
int err;
@@ -1088,15 +1088,15 @@ static int native_kick_ap(unsigned int c
return err;
}
-int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
+int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle)
{
- return native_kick_ap(cpu, tidle);
+ return smp_ops.kick_ap_alive(cpu, tidle);
}
void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu)
{
/* Cleanup possible dangling ends... */
- if (smp_ops.cpu_up == native_cpu_up && x86_platform.legacy.warm_reset)
+ if (smp_ops.kick_ap_alive == native_kick_ap && x86_platform.legacy.warm_reset)
smpboot_restore_warm_reset_vector();
}
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -314,7 +314,7 @@ cpu_initialize_context(unsigned int cpu,
return 0;
}
-static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle)
+static int xen_pv_kick_ap(unsigned int cpu, struct task_struct *idle)
{
int rc;
@@ -438,7 +438,7 @@ static const struct smp_ops xen_smp_ops
.smp_prepare_cpus = xen_pv_smp_prepare_cpus,
.smp_cpus_done = xen_smp_cpus_done,
- .cpu_up = xen_pv_cpu_up,
+ .kick_ap_alive = xen_pv_kick_ap,
.cpu_die = xen_pv_cpu_die,
.cleanup_dead_cpu = xen_pv_cleanup_dead_cpu,
.poll_sync_state = xen_pv_poll_sync_state,
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