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 #define XICS_RM_NOTIFY_EOI 0x8
75 u32 rm_action;
76 struct kvm_vcpu *rm_kick_target;
77 struct kvmppc_icp *rm_resend_icp;
78 u32 rm_reject;
79 u32 rm_eoied_irq;
80
81 /* Counters for each reason we exited real mode */
82 unsigned long n_rm_kick_vcpu;
83 unsigned long n_rm_check_resend;
84 unsigned long n_rm_reject;
85 unsigned long n_rm_notify_eoi;
86 /* Counters for handling ICP processing in real mode */
87 unsigned long n_check_resend;
88 unsigned long n_reject;
89
90 /* Debug stuff for real mode */
91 union kvmppc_icp_state rm_dbgstate;
92 struct kvm_vcpu *rm_dbgtgt;
93 };
94
95 struct kvmppc_ics {
96 arch_spinlock_t lock;
97 u16 icsid;
98 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
99 };
100
101 struct kvmppc_xics {
102 struct kvm *kvm;
103 struct kvm_device *dev;
104 struct dentry *dentry;
105 u32 max_icsid;
106 bool real_mode;
107 bool real_mode_dbg;
108 u32 err_noics;
109 u32 err_noicp;
110 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
111 };
112
kvmppc_xics_find_server(struct kvm * kvm,u32 nr)113 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
114 u32 nr)
115 {
116 struct kvm_vcpu *vcpu = NULL;
117 int i;
118
119 kvm_for_each_vcpu(i, vcpu, kvm) {
120 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
121 return vcpu->arch.icp;
122 }
123 return NULL;
124 }
125
kvmppc_xics_find_ics(struct kvmppc_xics * xics,u32 irq,u16 * source)126 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
127 u32 irq, u16 *source)
128 {
129 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
130 u16 src = irq & KVMPPC_XICS_SRC_MASK;
131 struct kvmppc_ics *ics;
132
133 if (source)
134 *source = src;
135 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
136 return NULL;
137 ics = xics->ics[icsid];
138 if (!ics)
139 return NULL;
140 return ics;
141 }
142
143
144 #endif /* _KVM_PPC_BOOK3S_XICS_H */
145