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 #ifdef CONFIG_KVM_XICS 14 /* 15 * We use a two-level tree to store interrupt source information. 16 * There are up to 1024 ICS nodes, each of which can represent 17 * 1024 sources. 18 */ 19 #define KVMPPC_XICS_MAX_ICS_ID 1023 20 #define KVMPPC_XICS_ICS_SHIFT 10 21 #define KVMPPC_XICS_IRQ_PER_ICS (1 << KVMPPC_XICS_ICS_SHIFT) 22 #define KVMPPC_XICS_SRC_MASK (KVMPPC_XICS_IRQ_PER_ICS - 1) 23 24 /* 25 * Interrupt source numbers below this are reserved, for example 26 * 0 is "no interrupt", and 2 is used for IPIs. 27 */ 28 #define KVMPPC_XICS_FIRST_IRQ 16 29 #define KVMPPC_XICS_NR_IRQS ((KVMPPC_XICS_MAX_ICS_ID + 1) * \ 30 KVMPPC_XICS_IRQ_PER_ICS) 31 32 /* Priority value to use for disabling an interrupt */ 33 #define MASKED 0xff 34 35 #define PQ_PRESENTED 1 36 #define PQ_QUEUED 2 37 38 /* State for one irq source */ 39 struct ics_irq_state { 40 u32 number; 41 u32 server; 42 u32 pq_state; 43 u8 priority; 44 u8 saved_priority; 45 u8 resend; 46 u8 masked_pending; 47 u8 lsi; /* level-sensitive interrupt */ 48 u8 exists; 49 int intr_cpu; 50 u32 host_irq; 51 }; 52 53 /* Atomic ICP state, updated with a single compare & swap */ 54 union kvmppc_icp_state { 55 unsigned long raw; 56 struct { 57 u8 out_ee:1; 58 u8 need_resend:1; 59 u8 cppr; 60 u8 mfrr; 61 u8 pending_pri; 62 u32 xisr; 63 }; 64 }; 65 66 /* One bit per ICS */ 67 #define ICP_RESEND_MAP_SIZE (KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1) 68 69 struct kvmppc_icp { 70 struct kvm_vcpu *vcpu; 71 unsigned long server_num; 72 union kvmppc_icp_state state; 73 unsigned long resend_map[ICP_RESEND_MAP_SIZE]; 74 75 /* Real mode might find something too hard, here's the action 76 * it might request from virtual mode 77 */ 78 #define XICS_RM_KICK_VCPU 0x1 79 #define XICS_RM_CHECK_RESEND 0x2 80 #define XICS_RM_NOTIFY_EOI 0x8 81 u32 rm_action; 82 struct kvm_vcpu *rm_kick_target; 83 struct kvmppc_icp *rm_resend_icp; 84 u32 rm_reject; 85 u32 rm_eoied_irq; 86 87 /* Counters for each reason we exited real mode */ 88 unsigned long n_rm_kick_vcpu; 89 unsigned long n_rm_check_resend; 90 unsigned long n_rm_notify_eoi; 91 /* Counters for handling ICP processing in real mode */ 92 unsigned long n_check_resend; 93 unsigned long n_reject; 94 95 /* Debug stuff for real mode */ 96 union kvmppc_icp_state rm_dbgstate; 97 struct kvm_vcpu *rm_dbgtgt; 98 }; 99 100 struct kvmppc_ics { 101 arch_spinlock_t lock; 102 u16 icsid; 103 struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; 104 }; 105 106 struct kvmppc_xics { 107 struct kvm *kvm; 108 struct kvm_device *dev; 109 struct dentry *dentry; 110 u32 max_icsid; 111 bool real_mode; 112 bool real_mode_dbg; 113 u32 err_noics; 114 u32 err_noicp; 115 struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1]; 116 }; 117 118 static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm, 119 u32 nr) 120 { 121 struct kvm_vcpu *vcpu = NULL; 122 int i; 123 124 kvm_for_each_vcpu(i, vcpu, kvm) { 125 if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num) 126 return vcpu->arch.icp; 127 } 128 return NULL; 129 } 130 131 static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics, 132 u32 irq, u16 *source) 133 { 134 u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT; 135 u16 src = irq & KVMPPC_XICS_SRC_MASK; 136 struct kvmppc_ics *ics; 137 138 if (source) 139 *source = src; 140 if (icsid > KVMPPC_XICS_MAX_ICS_ID) 141 return NULL; 142 ics = xics->ics[icsid]; 143 if (!ics) 144 return NULL; 145 return ics; 146 } 147 148 extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu); 149 extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, 150 unsigned long mfrr); 151 extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr); 152 extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr); 153 154 #endif /* CONFIG_KVM_XICS */ 155 #endif /* _KVM_PPC_BOOK3S_XICS_H */ 156