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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/xen/smp_pv.c | |
| parent | cpu/hotplug: Provide a split up CPUHP_BRINGUP mechanism (diff) | |
| download | linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.tar.xz 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/xen/smp_pv.c')
| -rw-r--r-- | arch/x86/xen/smp_pv.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index b089fb1cefc6..a92e8002b5cf 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -314,7 +314,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle) 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 __initconst = { .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, |