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 u32 rm_reject; 78 u32 rm_eoied_irq; 79 80 /* Debug stuff for real mode */ 81 union kvmppc_icp_state rm_dbgstate; 82 struct kvm_vcpu *rm_dbgtgt; 83 }; 84 85 struct kvmppc_ics { 86 struct mutex lock; 87 u16 icsid; 88 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; 89 }; 90 91 struct kvmppc_xics { 92 struct kvm *kvm; 93 struct kvm_device *dev; 94 struct dentry *dentry; 95 u32 max_icsid; 96 bool real_mode; 97 bool real_mode_dbg; 98 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1]; 99 }; 100 101 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm, 102 u32 nr) 103 { 104 struct kvm_vcpu *vcpu = NULL; 105 int i; 106 107 kvm_for_each_vcpu(i, vcpu, kvm) { 108 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num) 109 return vcpu->arch.icp; 110 } 111 return NULL; 112 } 113 114 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics, 115 u32 irq, u16 *source) 116 { 117 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT; 118 u16 src = irq & KVMPPC_XICS_SRC_MASK; 119 struct kvmppc_ics *ics; 120 121 if (source) 122 *source = src; 123 if (icsid > KVMPPC_XICS_MAX_ICS_ID) 124 return NULL; 125 ics = xics->ics[icsid]; 126 if (!ics) 127 return NULL; 128 return ics; 129 } 130 131 132 #endif /* _KVM_PPC_BOOK3S_XICS_H */ 133