Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Author: Kumar Gala <galak@kernel.crashing.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright 2009 Freescale Semiconductor Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/threads.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/hardirq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/dbell.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/irq_regs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/kvm_ppc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/trace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) void doorbell_exception(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	struct pt_regs *old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	irq_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	trace_doorbell_entry(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	ppc_msgsync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	may_hard_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	kvmppc_clear_host_ipi(smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	__this_cpu_inc(irq_stat.doorbell_irqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	smp_ipi_demux_relaxed(); /* already performed the barrier */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	trace_doorbell_exit(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	irq_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #else /* CONFIG_SMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) void doorbell_exception(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	printk(KERN_WARNING "Received doorbell on non-smp system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #endif /* CONFIG_SMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)