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gerrit-public.fairphone.software / kernel / msm-4.19 / 5d826c847b34de6415b4f1becd88a57ff619af50 / . / arch / powerpc / kvm / book3s_xics.h
blob: dd9326c5c19bfc1fb3ac0191fb199eb7899c4478 [file] [log] [blame]
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]1/*
2 * Copyright 2012 Michael Ellerman, IBM Corporation.
3 * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 */
9
10#ifndef _KVM_PPC_BOOK3S_XICS_H
11#define _KVM_PPC_BOOK3S_XICS_H
12
13/*
14 * We use a two-level tree to store interrupt source information.
15 * There are up to 1024 ICS nodes, each of which can represent
16 * 1024 sources.
17 */
18#define KVMPPC_XICS_MAX_ICS_ID 1023
19#define KVMPPC_XICS_ICS_SHIFT 10
20#define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT)
21#define KVMPPC_XICS_SRC_MASK (KVMPPC_XICS_IRQ_PER_ICS - 1)
22
23/*
24 * Interrupt source numbers below this are reserved, for example
25 * 0 is "no interrupt", and 2 is used for IPIs.
26 */
27#define KVMPPC_XICS_FIRST_IRQ 16
28#define KVMPPC_XICS_NR_IRQS ((KVMPPC_XICS_MAX_ICS_ID + 1) * \
29 KVMPPC_XICS_IRQ_PER_ICS)
30
31/* Priority value to use for disabling an interrupt */
32#define MASKED 0xff
33
34/* State for one irq source */
35struct ics_irq_state {
36 u32 number;
37 u32 server;
38 u8 priority;
Paul Mackerrasd19bd8622013-04-17 20:32:04 +0000[diff] [blame]39 u8 saved_priority;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]40 u8 resend;
41 u8 masked_pending;
42 u8 asserted; /* Only for LSI */
43 u8 exists;
44};
45
46/* Atomic ICP state, updated with a single compare & swap */
47union kvmppc_icp_state {
48 unsigned long raw;
49 struct {
50 u8 out_ee:1;
51 u8 need_resend:1;
52 u8 cppr;
53 u8 mfrr;
54 u8 pending_pri;
55 u32 xisr;
56 };
57};
58
59/* One bit per ICS */
60#define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
61
62struct kvmppc_icp {
63 struct kvm_vcpu *vcpu;
64 unsigned long server_num;
65 union kvmppc_icp_state state;
66 unsigned long resend_map[ICP_RESEND_MAP_SIZE];
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]67
68 /* Real mode might find something too hard, here's the action
69 * it might request from virtual mode
70 */
71#define XICS_RM_KICK_VCPU 0x1
72#define XICS_RM_CHECK_RESEND 0x2
73#define XICS_RM_REJECT 0x4
74 u32 rm_action;
75 struct kvm_vcpu *rm_kick_target;
76 u32 rm_reject;
77
78 /* Debug stuff for real mode */
79 union kvmppc_icp_state rm_dbgstate;
80 struct kvm_vcpu *rm_dbgtgt;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]81};
82
83struct kvmppc_ics {
84 struct mutex lock;
85 u16 icsid;
86 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
87};
88
89struct kvmppc_xics {
90 struct kvm *kvm;
Paul Mackerras5975a2e2013-04-27 00:28:37 +0000[diff] [blame]91 struct kvm_device *dev;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]92 struct dentry *dentry;
93 u32 max_icsid;
Benjamin Herrenschmidte7d26f22013-04-17 20:31:15 +0000[diff] [blame]94 bool real_mode;
95 bool real_mode_dbg;
Benjamin Herrenschmidtbc5ad3f2013-04-17 20:30:26 +0000[diff] [blame]96 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
97};
98
99static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
100 u32 nr)
101{
102 struct kvm_vcpu *vcpu = NULL;
103 int i;
104
105 kvm_for_each_vcpu(i, vcpu, kvm) {
106 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
107 return vcpu->arch.icp;
108 }
109 return NULL;
110}
111
112static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
113 u32 irq, u16 *source)
114{
115 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
116 u16 src = irq & KVMPPC_XICS_SRC_MASK;
117 struct kvmppc_ics *ics;
118
119 if (source)
120 *source = src;
121 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
122 return NULL;
123 ics = xics->ics[icsid];
124 if (!ics)
125 return NULL;
126 return ics;
127}
128
129
130#endif /* _KVM_PPC_BOOK3S_XICS_H */