RISC-V: Enable the IPI before workqueue_online_cpu()

[ Upstream commit 3908ba2 ]

Sometimes the hotplug cpu stalls at the arch_cpu_idle() for a while after
workqueue_online_cpu(). When cpu stalls at the idle loop, the reschedule
IPI is pending. However the enable bit is not enabled yet so the cpu stalls
at WFI until watchdog timeout. Therefore enable the IPI before the
workqueue_online_cpu() to fix the issue.

Fixes: 63c5484 ("workqueue: Add multiple affinity scopes and interface to select them")
Signed-off-by: Nick Hu <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: nick650823

arch/riscv/kernel/sbi-ipi.c

@@ -71,7 +71,7 @@ void __init sbi_ipi_init(void)
 	 * the masking/unmasking of virtual IPIs is done
 	 * via generic IPI-Mux
 	 */
-	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
+	cpuhp_setup_state(CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
 			  "irqchip/sbi-ipi:starting",
 			  sbi_ipi_starting_cpu, NULL);
 

include/linux/cpuhotplug.h

@@ -147,6 +147,7 @@ enum cpuhp_state {
 	CPUHP_AP_IRQ_LOONGARCH_STARTING,
 	CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
 	CPUHP_AP_IRQ_RISCV_IMSIC_STARTING,
+	CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING,
 	CPUHP_AP_ARM_MVEBU_COHERENCY,
 	CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
 	CPUHP_AP_PERF_X86_STARTING,