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 asserted; /* Only for LSI */
46 /* Atomic ICP state, updated with a single compare & swap */
47 union kvmppc_icp_state {
60 #define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)
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];
68 /* Real mode might find something too hard, here's the action
69 * it might request from virtual mode
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
76 struct kvm_vcpu *rm_kick_target;
77 struct kvmppc_icp *rm_resend_icp;
81 /* Debug stuff for real mode */
82 union kvmppc_icp_state rm_dbgstate;
83 struct kvm_vcpu *rm_dbgtgt;
89 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
94 struct kvm_device *dev;
95 struct dentry *dentry;
99 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];
102 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,
105 struct kvm_vcpu *vcpu = NULL;
108 kvm_for_each_vcpu(i, vcpu, kvm) {
109 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)
110 return vcpu->arch.icp;
115 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,
116 u32 irq, u16 *source)
118 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
119 u16 src = irq & KVMPPC_XICS_SRC_MASK;
120 struct kvmppc_ics *ics;
124 if (icsid > KVMPPC_XICS_MAX_ICS_ID)
126 ics = xics->ics[icsid];
133 #endif /* _KVM_PPC_BOOK3S_XICS_H */