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Date:   Tue, 16 May 2023 09:09:56 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>
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Subject: [tip: smp/core] riscv: Switch to hotplug core state synchronization
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Palmer Dabbelt <palmer@rivosinc.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Oleksandr Natalenko <oleksandr@natalenko.name>,
        Helge Deller <deller@gmx.de>,
        "Guilherme G. Piccoli" <gpiccoli@igalia.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
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The following commit has been merged into the smp/core branch of tip:

Commit-ID:     72b11aa7f8f93449141544cecb21b2963416902d
Gitweb:        https://git.kernel.org/tip/72b11aa7f8f93449141544cecb21b2963416902d
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Fri, 12 May 2023 23:07:40 +02:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 15 May 2023 13:44:59 +02:00

riscv: Switch to hotplug core state synchronization

Switch to the CPU hotplug core state tracking and synchronization
mechanim. No functional change intended.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
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/20230512205256.916055844@linutronix.de
---
 arch/riscv/Kconfig              |  1 +
 arch/riscv/include/asm/smp.h    |  2 +-
 arch/riscv/kernel/cpu-hotplug.c | 14 +++++++-------
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 348c0fa..13f0584 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -122,6 +122,7 @@ config RISCV
 	select HAVE_RSEQ
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
+	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
 	select KASAN_VMALLOC if KASAN
diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index c4b7701..0d55584 100644
--- a/arch/riscv/include/asm/smp.h
+++ b/arch/riscv/include/asm/smp.h
@@ -70,7 +70,7 @@ asmlinkage void smp_callin(void);
 
 #if defined CONFIG_HOTPLUG_CPU
 int __cpu_disable(void);
-void __cpu_die(unsigned int cpu);
+static inline void __cpu_die(unsigned int cpu) { }
 #endif /* CONFIG_HOTPLUG_CPU */
 
 #else
diff --git a/arch/riscv/kernel/cpu-hotplug.c b/arch/riscv/kernel/cpu-hotplug.c
index a941adc..457a18e 100644
--- a/arch/riscv/kernel/cpu-hotplug.c
+++ b/arch/riscv/kernel/cpu-hotplug.c
@@ -8,6 +8,7 @@
 #include <linux/sched.h>
 #include <linux/err.h>
 #include <linux/irq.h>
+#include <linux/cpuhotplug.h>
 #include <linux/cpu.h>
 #include <linux/sched/hotplug.h>
 #include <asm/irq.h>
@@ -49,17 +50,15 @@ int __cpu_disable(void)
 	return ret;
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
 /*
- * Called on the thread which is asking for a CPU to be shutdown.
+ * Called on the thread which is asking for a CPU to be shutdown, if the
+ * CPU reported dead to the hotplug core.
  */
-void __cpu_die(unsigned int cpu)
+void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)
 {
 	int ret = 0;
 
-	if (!cpu_wait_death(cpu, 5)) {
-		pr_err("CPU %u: didn't die\n", cpu);
-		return;
-	}
 	pr_notice("CPU%u: off\n", cpu);
 
 	/* Verify from the firmware if the cpu is really stopped*/
@@ -76,9 +75,10 @@ void __noreturn arch_cpu_idle_dead(void)
 {
 	idle_task_exit();
 
-	(void)cpu_report_death();
+	cpuhp_ap_report_dead();
 
 	cpu_ops[smp_processor_id()]->cpu_stop();
 	/* It should never reach here */
 	BUG();
 }
+#endif