2 * Copyright 2012 Michael Ellerman, IBM Corporation.
3 * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation
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.
10 #ifndef _KVM_PPC_BOOK3S_XICS_H
11 #define _KVM_PPC_BOOK3S_XICS_H
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
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)
24 * Interrupt source numbers below this are reserved, for example
25 * 0 is "no interrupt", and 2 is used for IPIs.
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)
31 /* Priority value to use for disabling an interrupt */
34 /* State for one irq source */
35 struct ics_irq_state {
42 u8 lsi; /* level-sensitive interrupt */
43 u8 asserted; /* Only for LSI */
49 /* Atomic ICP state, updated with a single compare & swap */
50 union kvmppc_icp_state {
63 #define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
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];
71 /* Real mode might find something too hard, here's the action
72 * it might request from virtual mode
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
79 struct kvm_vcpu *rm_kick_target;
80 struct kvmppc_icp *rm_resend_icp;
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;
93 /* Debug stuff for real mode */
94 union kvmppc_icp_state rm_dbgstate;
95 struct kvm_vcpu *rm_dbgtgt;
101 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
106 struct kvm_device *dev;
107 struct dentry *dentry;
113 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
116 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
119 struct kvm_vcpu *vcpu = NULL;
122 kvm_for_each_vcpu(i, vcpu, kvm) {
123 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
124 return vcpu->arch.icp;
129 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
130 u32 irq, u16 *source)
132 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
133 u16 src = irq & KVMPPC_XICS_SRC_MASK;
134 struct kvmppc_ics *ics;
138 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
140 ics = xics->ics[icsid];
147 #endif /* _KVM_PPC_BOOK3S_XICS_H */