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 lsi; /* level-sensitive interrupt */ 43 u8 asserted; /* Only for LSI */ 44 u8 exists; 45 }; 46 47 /* Atomic ICP state, updated with a single compare & swap */ 48 union kvmppc_icp_state { 49 unsigned long raw; 50 struct { 51 u8 out_ee:1; 52 u8 need_resend:1; 53 u8 cppr; 54 u8 mfrr; 55 u8 pending_pri; 56 u32 xisr; 57 }; 58 }; 59 60 /* One bit per ICS */ 61 #define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1) 62 63 struct kvmppc_icp { 64 struct kvm_vcpu *vcpu; 65 unsigned long server_num; 66 union kvmppc_icp_state state; 67 unsigned long resend_map[ICP_RESEND_MAP_SIZE]; 68 69 /* Real mode might find something too hard, here's the action 70 * it might request from virtual mode 71 */ 72 #define XICS_RM_KICK_VCPU 0x1 73 #define XICS_RM_CHECK_RESEND 0x2 74 #define XICS_RM_REJECT 0x4 75 #define XICS_RM_NOTIFY_EOI 0x8 76 u32 rm_action; 77 struct kvm_vcpu *rm_kick_target; 78 struct kvmppc_icp *rm_resend_icp; 79 u32 rm_reject; 80 u32 rm_eoied_irq; 81 82 /* Counters for each reason we exited real mode */ 83 unsigned long n_rm_kick_vcpu; 84 unsigned long n_rm_check_resend; 85 unsigned long n_rm_reject; 86 unsigned long n_rm_notify_eoi; 87 /* Counters for handling ICP processing in real mode */ 88 unsigned long n_check_resend; 89 unsigned long n_reject; 90 91 /* Debug stuff for real mode */ 92 union kvmppc_icp_state rm_dbgstate; 93 struct kvm_vcpu *rm_dbgtgt; 94 }; 95 96 struct kvmppc_ics { 97 arch_spinlock_t lock; 98 u16 icsid; 99 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; 100 }; 101 102 struct kvmppc_xics { 103 struct kvm *kvm; 104 struct kvm_device *dev; 105 struct dentry *dentry; 106 u32 max_icsid; 107 bool real_mode; 108 bool real_mode_dbg; 109 u32 err_noics; 110 u32 err_noicp; 111 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1]; 112 }; 113 114 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm, 115 u32 nr) 116 { 117 struct kvm_vcpu *vcpu = NULL; 118 int i; 119 120 kvm_for_each_vcpu(i, vcpu, kvm) { 121 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num) 122 return vcpu->arch.icp; 123 } 124 return NULL; 125 } 126 127 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics, 128 u32 irq, u16 *source) 129 { 130 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT; 131 u16 src = irq & KVMPPC_XICS_SRC_MASK; 132 struct kvmppc_ics *ics; 133 134 if (source) 135 *source = src; 136 if (icsid > KVMPPC_XICS_MAX_ICS_ID) 137 return NULL; 138 ics = xics->ics[icsid]; 139 if (!ics) 140 return NULL; 141 return ics; 142 } 143 144 145 #endif /* _KVM_PPC_BOOK3S_XICS_H */ 146