tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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;
39 u8 saved_priority;
40 u8 resend;
41 u8 masked_pending;
42 u8 lsi; /* level-sensitive interrupt */
43 u8 asserted; /* Only for LSI */
44 u8 exists;
45 int intr_cpu;
46 u32 host_irq;
47};
48
49/* Atomic ICP state, updated with a single compare & swap */
50union kvmppc_icp_state {
51 unsigned long raw;
52 struct {
53 u8 out_ee:1;
54 u8 need_resend:1;
55 u8 cppr;
56 u8 mfrr;
57 u8 pending_pri;
58 u32 xisr;
59 };
60};
61
62/* One bit per ICS */
63#define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
64
65struct kvmppc_icp {
66 struct kvm_vcpu *vcpu;
67 unsigned long server_num;
68 union kvmppc_icp_state state;
69 unsigned long resend_map[ICP_RESEND_MAP_SIZE];
70
71 /* Real mode might find something too hard, here's the action
72 * it might request from virtual mode
73 */
74#define XICS_RM_KICK_VCPU 0x1
75#define XICS_RM_CHECK_RESEND 0x2
76#define XICS_RM_REJECT 0x4
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_reject;
88 unsigned long n_rm_notify_eoi;
89 /* Counters for handling ICP processing in real mode */
90 unsigned long n_check_resend;
91 unsigned long n_reject;
92
93 /* Debug stuff for real mode */
94 union kvmppc_icp_state rm_dbgstate;
95 struct kvm_vcpu *rm_dbgtgt;
96};
97
98struct kvmppc_ics {
99 arch_spinlock_t lock;
100 u16 icsid;
101 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
102};
103
104struct kvmppc_xics {
105 struct kvm *kvm;
106 struct kvm_device *dev;
107 struct dentry *dentry;
108 u32 max_icsid;
109 bool real_mode;
110 bool real_mode_dbg;
111 u32 err_noics;
112 u32 err_noicp;
113 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
114};
115
116static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
117 u32 nr)
118{
119 struct kvm_vcpu *vcpu = NULL;
120 int i;
121
122 kvm_for_each_vcpu(i, vcpu, kvm) {
123 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
124 return vcpu->arch.icp;
125 }
126 return NULL;
127}
128
129static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
130 u32 irq, u16 *source)
131{
132 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
133 u16 src = irq & KVMPPC_XICS_SRC_MASK;
134 struct kvmppc_ics *ics;
135
136 if (source)
137 *source = src;
138 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
139 return NULL;
140 ics = xics->ics[icsid];
141 if (!ics)
142 return NULL;
143 return ics;
144}
145
146
147#endif /* _KVM_PPC_BOOK3S_XICS_H */