1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright 2012 Michael Ellerman, IBM Corporation.
4 * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
5 */
6
7 #ifndef _KVM_PPC_BOOK3S_XICS_H
8 #define _KVM_PPC_BOOK3S_XICS_H
9
10 #ifdef CONFIG_KVM_XICS
11 /*
12 * We use a two-level tree to store interrupt source information.
13 * There are up to 1024 ICS nodes, each of which can represent
14 * 1024 sources.
15 */
16 #define KVMPPC_XICS_MAX_ICS_ID 1023
17 #define KVMPPC_XICS_ICS_SHIFT 10
18 #define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT)
19 #define KVMPPC_XICS_SRC_MASK (KVMPPC_XICS_IRQ_PER_ICS - 1)
20
21 /*
22 * Interrupt source numbers below this are reserved, for example
23 * 0 is "no interrupt", and 2 is used for IPIs.
24 */
25 #define KVMPPC_XICS_FIRST_IRQ 16
26 #define KVMPPC_XICS_NR_IRQS ((KVMPPC_XICS_MAX_ICS_ID + 1) * \
27 KVMPPC_XICS_IRQ_PER_ICS)
28
29 /* Priority value to use for disabling an interrupt */
30 #define MASKED 0xff
31
32 #define PQ_PRESENTED 1
33 #define PQ_QUEUED 2
34
35 /* State for one irq source */
36 struct ics_irq_state {
37 u32 number;
38 u32 server;
39 u32 pq_state;
40 u8 priority;
41 u8 saved_priority;
42 u8 resend;
43 u8 masked_pending;
44 u8 lsi; /* level-sensitive interrupt */
45 u8 exists;
46 int intr_cpu;
47 u32 host_irq;
48 };
49
50 /* Atomic ICP state, updated with a single compare & swap */
51 union kvmppc_icp_state {
52 unsigned long raw;
53 struct {
54 u8 out_ee:1;
55 u8 need_resend:1;
56 u8 cppr;
57 u8 mfrr;
58 u8 pending_pri;
59 u32 xisr;
60 };
61 };
62
63 /* One bit per ICS */
64 #define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
65
66 struct kvmppc_icp {
67 struct kvm_vcpu *vcpu;
68 unsigned long server_num;
69 union kvmppc_icp_state state;
70 unsigned long resend_map[ICP_RESEND_MAP_SIZE];
71
72 /* Real mode might find something too hard, here's the action
73 * it might request from virtual mode
74 */
75 #define XICS_RM_KICK_VCPU 0x1
76 #define XICS_RM_CHECK_RESEND 0x2
77 #define XICS_RM_NOTIFY_EOI 0x8
78 u32 rm_action;
79 struct kvm_vcpu *rm_kick_target;
80 struct kvmppc_icp *rm_resend_icp;
81 u32 rm_reject;
82 u32 rm_eoied_irq;
83
84 /* Counters for each reason we exited real mode */
85 unsigned long n_rm_kick_vcpu;
86 unsigned long n_rm_check_resend;
87 unsigned long n_rm_notify_eoi;
88 /* Counters for handling ICP processing in real mode */
89 unsigned long n_check_resend;
90 unsigned long n_reject;
91
92 /* Debug stuff for real mode */
93 union kvmppc_icp_state rm_dbgstate;
94 struct kvm_vcpu *rm_dbgtgt;
95 };
96
97 struct kvmppc_ics {
98 arch_spinlock_t lock;
99 u16 icsid;
100 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
101 };
102
103 struct kvmppc_xics {
104 struct kvm *kvm;
105 struct kvm_device *dev;
106 struct dentry *dentry;
107 u32 max_icsid;
108 bool real_mode;
109 bool real_mode_dbg;
110 u32 err_noics;
111 u32 err_noicp;
112 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
113 };
114
115 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
116 u32 nr)
117 {
118 struct kvm_vcpu *vcpu = NULL;
119 unsigned long i;
120
121 kvm_for_each_vcpu(i, vcpu, kvm) {
122 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
123 return vcpu->arch.icp;
124 }
125 return NULL;
126 }
127
128 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
129 u32 irq, u16 *source)
130 {
131 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
132 u16 src = irq & KVMPPC_XICS_SRC_MASK;
133 struct kvmppc_ics *ics;
134
135 if (source)
136 *source = src;
137 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
138 return NULL;
139 ics = xics->ics[icsid];
140 if (!ics)
141 return NULL;
142 return ics;
143 }
144
145 extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu);
146 extern unsigned long xics_rm_h_xirr_x(struct kvm_vcpu *vcpu);
147 extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
148 unsigned long mfrr);
149 extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);
150 extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr);
151
152 #endif /* CONFIG_KVM_XICS */
153 #endif /* _KVM_PPC_BOOK3S_XICS_H */
154
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