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 */
35 struct ics_irq_state {
36 u32 number;
37 u32 server;
38 u8 priority;
39 u8 saved_priority;
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 */
47 union 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
62 struct 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];
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;
81 };
82
83 struct kvmppc_ics {
84 struct mutex lock;
85 u16 icsid;
86 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
87 };
88
89 struct kvmppc_xics {
90 struct kvm *kvm;
91 struct kvm_device *dev;
92 struct dentry *dentry;
93 u32 max_icsid;
94 bool real_mode;
95 bool real_mode_dbg;
96 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
97 };
98
kvmppc_xics_find_server(struct kvm * kvm,u32 nr)99 static 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
kvmppc_xics_find_ics(struct kvmppc_xics * xics,u32 irq,u16 * source)112 static 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 */
131