1 /* 2 * Copyright 2017 Benjamin Herrenschmidt, IBM Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License, version 2, as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef _KVM_PPC_BOOK3S_XIVE_H 10 #define _KVM_PPC_BOOK3S_XIVE_H 11 12 #ifdef CONFIG_KVM_XICS 13 #include "book3s_xics.h" 14 15 /* 16 * State for one guest irq source. 17 * 18 * For each guest source we allocate a HW interrupt in the XIVE 19 * which we use for all SW triggers. It will be unused for 20 * pass-through but it's easier to keep around as the same 21 * guest interrupt can alternatively be emulated or pass-through 22 * if a physical device is hot unplugged and replaced with an 23 * emulated one. 24 * 25 * This state structure is very similar to the XICS one with 26 * additional XIVE specific tracking. 27 */ 28 struct kvmppc_xive_irq_state { 29 bool valid; /* Interrupt entry is valid */ 30 31 u32 number; /* Guest IRQ number */ 32 u32 ipi_number; /* XIVE IPI HW number */ 33 struct xive_irq_data ipi_data; /* XIVE IPI associated data */ 34 u32 pt_number; /* XIVE Pass-through number if any */ 35 struct xive_irq_data *pt_data; /* XIVE Pass-through associated data */ 36 37 /* Targetting as set by guest */ 38 u8 guest_priority; /* Guest set priority */ 39 u8 saved_priority; /* Saved priority when masking */ 40 41 /* Actual targetting */ 42 u32 act_server; /* Actual server */ 43 u8 act_priority; /* Actual priority */ 44 45 /* Various state bits */ 46 bool in_eoi; /* Synchronize with H_EOI */ 47 bool old_p; /* P bit state when masking */ 48 bool old_q; /* Q bit state when masking */ 49 bool lsi; /* level-sensitive interrupt */ 50 bool asserted; /* Only for emulated LSI: current state */ 51 52 /* Saved for migration state */ 53 bool in_queue; 54 bool saved_p; 55 bool saved_q; 56 u8 saved_scan_prio; 57 }; 58 59 /* Select the "right" interrupt (IPI vs. passthrough) */ 60 static inline void kvmppc_xive_select_irq(struct kvmppc_xive_irq_state *state, 61 u32 *out_hw_irq, 62 struct xive_irq_data **out_xd) 63 { 64 if (state->pt_number) { 65 if (out_hw_irq) 66 *out_hw_irq = state->pt_number; 67 if (out_xd) 68 *out_xd = state->pt_data; 69 } else { 70 if (out_hw_irq) 71 *out_hw_irq = state->ipi_number; 72 if (out_xd) 73 *out_xd = &state->ipi_data; 74 } 75 } 76 77 /* 78 * This corresponds to an "ICS" in XICS terminology, we use it 79 * as a mean to break up source information into multiple structures. 80 */ 81 struct kvmppc_xive_src_block { 82 arch_spinlock_t lock; 83 u16 id; 84 struct kvmppc_xive_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; 85 }; 86 87 88 struct kvmppc_xive { 89 struct kvm *kvm; 90 struct kvm_device *dev; 91 struct dentry *dentry; 92 93 /* VP block associated with the VM */ 94 u32 vp_base; 95 96 /* Blocks of sources */ 97 struct kvmppc_xive_src_block *src_blocks[KVMPPC_XICS_MAX_ICS_ID + 1]; 98 u32 max_sbid; 99 100 /* 101 * For state save, we lazily scan the queues on the first interrupt 102 * being migrated. We don't have a clean way to reset that flags 103 * so we keep track of the number of valid sources and how many of 104 * them were migrated so we can reset when all of them have been 105 * processed. 106 */ 107 u32 src_count; 108 u32 saved_src_count; 109 110 /* 111 * Some irqs are delayed on restore until the source is created, 112 * keep track here of how many of them 113 */ 114 u32 delayed_irqs; 115 116 /* Which queues (priorities) are in use by the guest */ 117 u8 qmap; 118 119 /* Queue orders */ 120 u32 q_order; 121 u32 q_page_order; 122 123 /* Flags */ 124 u8 single_escalation; 125 }; 126 127 #define KVMPPC_XIVE_Q_COUNT 8 128 129 struct kvmppc_xive_vcpu { 130 struct kvmppc_xive *xive; 131 struct kvm_vcpu *vcpu; 132 bool valid; 133 134 /* Server number. This is the HW CPU ID from a guest perspective */ 135 u32 server_num; 136 137 /* 138 * HW VP corresponding to this VCPU. This is the base of the VP 139 * block plus the server number. 140 */ 141 u32 vp_id; 142 u32 vp_chip_id; 143 u32 vp_cam; 144 145 /* IPI used for sending ... IPIs */ 146 u32 vp_ipi; 147 struct xive_irq_data vp_ipi_data; 148 149 /* Local emulation state */ 150 uint8_t cppr; /* guest CPPR */ 151 uint8_t hw_cppr;/* Hardware CPPR */ 152 uint8_t mfrr; 153 uint8_t pending; 154 155 /* Each VP has 8 queues though we only provision some */ 156 struct xive_q queues[KVMPPC_XIVE_Q_COUNT]; 157 u32 esc_virq[KVMPPC_XIVE_Q_COUNT]; 158 char *esc_virq_names[KVMPPC_XIVE_Q_COUNT]; 159 160 /* Stash a delayed irq on restore from migration (see set_icp) */ 161 u32 delayed_irq; 162 163 /* Stats */ 164 u64 stat_rm_h_xirr; 165 u64 stat_rm_h_ipoll; 166 u64 stat_rm_h_cppr; 167 u64 stat_rm_h_eoi; 168 u64 stat_rm_h_ipi; 169 u64 stat_vm_h_xirr; 170 u64 stat_vm_h_ipoll; 171 u64 stat_vm_h_cppr; 172 u64 stat_vm_h_eoi; 173 u64 stat_vm_h_ipi; 174 }; 175 176 static inline struct kvm_vcpu *kvmppc_xive_find_server(struct kvm *kvm, u32 nr) 177 { 178 struct kvm_vcpu *vcpu = NULL; 179 int i; 180 181 kvm_for_each_vcpu(i, vcpu, kvm) { 182 if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num) 183 return vcpu; 184 } 185 return NULL; 186 } 187 188 static inline struct kvmppc_xive_src_block *kvmppc_xive_find_source(struct kvmppc_xive *xive, 189 u32 irq, u16 *source) 190 { 191 u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT; 192 u16 src = irq & KVMPPC_XICS_SRC_MASK; 193 194 if (source) 195 *source = src; 196 if (bid > KVMPPC_XICS_MAX_ICS_ID) 197 return NULL; 198 return xive->src_blocks[bid]; 199 } 200 201 /* 202 * Mapping between guest priorities and host priorities 203 * is as follow. 204 * 205 * Guest request for 0...6 are honored. Guest request for anything 206 * higher results in a priority of 6 being applied. 207 * 208 * Similar mapping is done for CPPR values 209 */ 210 static inline u8 xive_prio_from_guest(u8 prio) 211 { 212 if (prio == 0xff || prio < 6) 213 return prio; 214 return 6; 215 } 216 217 static inline u8 xive_prio_to_guest(u8 prio) 218 { 219 return prio; 220 } 221 222 static inline u32 __xive_read_eq(__be32 *qpage, u32 msk, u32 *idx, u32 *toggle) 223 { 224 u32 cur; 225 226 if (!qpage) 227 return 0; 228 cur = be32_to_cpup(qpage + *idx); 229 if ((cur >> 31) == *toggle) 230 return 0; 231 *idx = (*idx + 1) & msk; 232 if (*idx == 0) 233 (*toggle) ^= 1; 234 return cur & 0x7fffffff; 235 } 236 237 extern unsigned long xive_rm_h_xirr(struct kvm_vcpu *vcpu); 238 extern unsigned long xive_rm_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server); 239 extern int xive_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, 240 unsigned long mfrr); 241 extern int xive_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr); 242 extern int xive_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr); 243 244 extern unsigned long (*__xive_vm_h_xirr)(struct kvm_vcpu *vcpu); 245 extern unsigned long (*__xive_vm_h_ipoll)(struct kvm_vcpu *vcpu, unsigned long server); 246 extern int (*__xive_vm_h_ipi)(struct kvm_vcpu *vcpu, unsigned long server, 247 unsigned long mfrr); 248 extern int (*__xive_vm_h_cppr)(struct kvm_vcpu *vcpu, unsigned long cppr); 249 extern int (*__xive_vm_h_eoi)(struct kvm_vcpu *vcpu, unsigned long xirr); 250 251 #endif /* CONFIG_KVM_XICS */ 252 #endif /* _KVM_PPC_BOOK3S_XICS_H */ 253