| /* | |
| * Author: Kumar Gala <galak@kernel.crashing.org> | |
| * | |
| * Copyright 2009 Freescale Semiconductor Inc. | |
| * | |
| * This program is free software; you can redistribute it and/or modify it | |
| * under the terms of the GNU General Public License as published by the | |
| * Free Software Foundation; either version 2 of the License, or (at your | |
| * option) any later version. | |
| */ | |
| #include <linux/stddef.h> | |
| #include <linux/kernel.h> | |
| #include <linux/smp.h> | |
| #include <linux/threads.h> | |
| #include <linux/hardirq.h> | |
| #include <asm/dbell.h> | |
| #include <asm/irq_regs.h> | |
| #include <asm/kvm_ppc.h> | |
| #ifdef CONFIG_SMP | |
| void doorbell_setup_this_cpu(void) | |
| { | |
| unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK; | |
| smp_muxed_ipi_set_data(smp_processor_id(), tag); | |
| } | |
| void doorbell_cause_ipi(int cpu, unsigned long data) | |
| { | |
| /* Order previous accesses vs. msgsnd, which is treated as a store */ | |
| mb(); | |
| ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data); | |
| } | |
| void doorbell_exception(struct pt_regs *regs) | |
| { | |
| struct pt_regs *old_regs = set_irq_regs(regs); | |
| irq_enter(); | |
| may_hard_irq_enable(); | |
| kvmppc_set_host_ipi(smp_processor_id(), 0); | |
| __this_cpu_inc(irq_stat.doorbell_irqs); | |
| smp_ipi_demux(); | |
| irq_exit(); | |
| set_irq_regs(old_regs); | |
| } | |
| #else /* CONFIG_SMP */ | |
| void doorbell_exception(struct pt_regs *regs) | |
| { | |
| printk(KERN_WARNING "Received doorbell on non-smp system\n"); | |
| } | |
| #endif /* CONFIG_SMP */ | |