dbell.c (e5451c8f8330e03ad3cfa16048b4daf961af434f) dbell.c (b866cc2199d6a6cdcefe4acfe4cfca3ac3c6d38e)
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

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15#include <linux/threads.h>
16#include <linux/hardirq.h>
17
18#include <asm/dbell.h>
19#include <asm/irq_regs.h>
20#include <asm/kvm_ppc.h>
21
22#ifdef CONFIG_SMP
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

--- 6 unchanged lines hidden (view full) ---

15#include <linux/threads.h>
16#include <linux/hardirq.h>
17
18#include <asm/dbell.h>
19#include <asm/irq_regs.h>
20#include <asm/kvm_ppc.h>
21
22#ifdef CONFIG_SMP
23void doorbell_setup_this_cpu(void)
23
24/*
25 * Doorbells must only be used if CPU_FTR_DBELL is available.
26 * msgsnd is used in HV, and msgsndp is used in !HV.
27 *
28 * These should be used by platform code that is aware of restrictions.
29 * Other arch code should use ->cause_ipi.
30 *
31 * doorbell_global_ipi() sends a dbell to any target CPU.
32 * Must be used only by architectures that address msgsnd target
33 * by PIR/get_hard_smp_processor_id.
34 */
35void doorbell_global_ipi(int cpu)
24{
36{
25 unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK;
37 u32 tag = get_hard_smp_processor_id(cpu);
26
38
27 smp_muxed_ipi_set_data(smp_processor_id(), tag);
39 kvmppc_set_host_ipi(cpu, 1);
40 /* Order previous accesses vs. msgsnd, which is treated as a store */
41 mb();
42 ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
28}
29
43}
44
30void doorbell_cause_ipi(int cpu, unsigned long data)
45/*
46 * doorbell_core_ipi() sends a dbell to a target CPU in the same core.
47 * Must be used only by architectures that address msgsnd target
48 * by TIR/cpu_thread_in_core.
49 */
50void doorbell_core_ipi(int cpu)
31{
51{
52 u32 tag = cpu_thread_in_core(cpu);
53
54 kvmppc_set_host_ipi(cpu, 1);
32 /* Order previous accesses vs. msgsnd, which is treated as a store */
33 mb();
55 /* Order previous accesses vs. msgsnd, which is treated as a store */
56 mb();
34 ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data);
57 ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, tag);
35}
36
58}
59
60/*
61 * Attempt to cause a core doorbell if destination is on the same core.
62 * Returns 1 on success, 0 on failure.
63 */
64int doorbell_try_core_ipi(int cpu)
65{
66 int this_cpu = get_cpu();
67 int ret = 0;
68
69 if (cpumask_test_cpu(cpu, cpu_sibling_mask(this_cpu))) {
70 doorbell_core_ipi(cpu);
71 ret = 1;
72 }
73
74 put_cpu();
75
76 return ret;
77}
78
37void doorbell_exception(struct pt_regs *regs)
38{
39 struct pt_regs *old_regs = set_irq_regs(regs);
40
41 irq_enter();
42
43 may_hard_irq_enable();
44

--- 15 unchanged lines hidden --- 		79void doorbell_exception(struct pt_regs *regs)
80{
81 struct pt_regs *old_regs = set_irq_regs(regs);
82
83 irq_enter();
84
85 may_hard_irq_enable();
86

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