projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 620165f9 KG |
1 | /* |
| 2 | * Author: Kumar Gala <galak@kernel.crashing.org> | |
| 3 | * | |
| 4 | * Copyright 2009 Freescale Semiconductor Inc. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify it | |
| 7 | * under the terms of the GNU General Public License as published by the | |
| 8 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 9 | * option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/stddef.h> | |
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/smp.h> | |
| 15 | #include <linux/threads.h> | |
| 23d72bfd | 16 | #include <linux/hardirq.h> |
| 620165f9 KG |
17 | |
| 18 | #include <asm/dbell.h> | |
| 0e37d259 | 19 | #include <asm/irq_regs.h> |
| 755563bc | 20 | #include <asm/kvm_ppc.h> |
| 620165f9 KG |
21 | |
| 22 | #ifdef CONFIG_SMP | |
| b9f1cd71 BH |
23 | void doorbell_setup_this_cpu(void) |
| 24 | { | |
| 42d02b81 | 25 | unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK; |
| b9f1cd71 | 26 | |
| 23d72bfd | 27 | smp_muxed_ipi_set_data(smp_processor_id(), tag); |
| b9f1cd71 BH |
28 | } |
| 29 | ||
| 23d72bfd | 30 | void doorbell_cause_ipi(int cpu, unsigned long data) |
| 620165f9 | 31 | { |
| 9fb1b36c PM |
32 | /* Order previous accesses vs. msgsnd, which is treated as a store */ |
| 33 | mb(); | |
| 42d02b81 | 34 | ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data); |
| 620165f9 | 35 | } |
| e3145b38 BH |
36 | |
| 37 | void doorbell_exception(struct pt_regs *regs) | |
| 38 | { | |
| 0e37d259 | 39 | struct pt_regs *old_regs = set_irq_regs(regs); |
| e3145b38 | 40 | |
| 23d72bfd | 41 | irq_enter(); |
| b9f1cd71 | 42 | |
| 7230c564 BH |
43 | may_hard_irq_enable(); |
| 44 | ||
| 755563bc | 45 | kvmppc_set_host_ipi(smp_processor_id(), 0); |
| 69111bac | 46 | __this_cpu_inc(irq_stat.doorbell_irqs); |
| a6a058e5 | 47 | |
| 23d72bfd | 48 | smp_ipi_demux(); |
| e3145b38 | 49 | |
| 23d72bfd | 50 | irq_exit(); |
| 0e37d259 | 51 | set_irq_regs(old_regs); |
| e3145b38 | 52 | } |
| e3145b38 BH |
53 | #else /* CONFIG_SMP */ |
| 54 | void doorbell_exception(struct pt_regs *regs) | |
| 55 | { | |
| 56 | printk(KERN_WARNING "Received doorbell on non-smp system\n"); | |
| 57 | } | |
| 58 | #endif /* CONFIG_SMP */ | |
| 59 |