1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright 2017 Benjamin Herrenschmidt, IBM Corporation 4 */ 5 6 #ifndef _KVM_PPC_BOOK3S_XIVE_H 7 #define _KVM_PPC_BOOK3S_XIVE_H 8 9 #ifdef CONFIG_KVM_XICS 10 #include "book3s_xics.h" 11 12 /* 13 * The XIVE Interrupt source numbers are within the range 0 to 14 * KVMPPC_XICS_NR_IRQS. 15 */ 16 #define KVMPPC_XIVE_FIRST_IRQ 0 17 #define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS 18 19 /* 20 * State for one guest irq source. 21 * 22 * For each guest source we allocate a HW interrupt in the XIVE 23 * which we use for all SW triggers. It will be unused for 24 * pass-through but it's easier to keep around as the same 25 * guest interrupt can alternatively be emulated or pass-through 26 * if a physical device is hot unplugged and replaced with an 27 * emulated one. 28 * 29 * This state structure is very similar to the XICS one with 30 * additional XIVE specific tracking. 31 */ 32 struct kvmppc_xive_irq_state { 33 bool valid; /* Interrupt entry is valid */ 34 35 u32 number; /* Guest IRQ number */ 36 u32 ipi_number; /* XIVE IPI HW number */ 37 struct xive_irq_data ipi_data; /* XIVE IPI associated data */ 38 u32 pt_number; /* XIVE Pass-through number if any */ 39 struct xive_irq_data *pt_data; /* XIVE Pass-through associated data */ 40 41 /* Targetting as set by guest */ 42 u8 guest_priority; /* Guest set priority */ 43 u8 saved_priority; /* Saved priority when masking */ 44 45 /* Actual targetting */ 46 u32 act_server; /* Actual server */ 47 u8 act_priority; /* Actual priority */ 48 49 /* Various state bits */ 50 bool in_eoi; /* Synchronize with H_EOI */ 51 bool old_p; /* P bit state when masking */ 52 bool old_q; /* Q bit state when masking */ 53 bool lsi; /* level-sensitive interrupt */ 54 bool asserted; /* Only for emulated LSI: current state */ 55 56 /* Saved for migration state */ 57 bool in_queue; 58 bool saved_p; 59 bool saved_q; 60 u8 saved_scan_prio; 61 62 /* Xive native */ 63 u32 eisn; /* Guest Effective IRQ number */ 64 }; 65 66 /* Select the "right" interrupt (IPI vs. passthrough) */ 67 static inline void kvmppc_xive_select_irq(struct kvmppc_xive_irq_state *state, 68 u32 *out_hw_irq, 69 struct xive_irq_data **out_xd) 70 { 71 if (state->pt_number) { 72 if (out_hw_irq) 73 *out_hw_irq = state->pt_number; 74 if (out_xd) 75 *out_xd = state->pt_data; 76 } else { 77 if (out_hw_irq) 78 *out_hw_irq = state->ipi_number; 79 if (out_xd) 80 *out_xd = &state->ipi_data; 81 } 82 } 83 84 /* 85 * This corresponds to an "ICS" in XICS terminology, we use it 86 * as a mean to break up source information into multiple structures. 87 */ 88 struct kvmppc_xive_src_block { 89 arch_spinlock_t lock; 90 u16 id; 91 struct kvmppc_xive_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS]; 92 }; 93 94 struct kvmppc_xive; 95 96 struct kvmppc_xive_ops { 97 int (*reset_mapped)(struct kvm *kvm, unsigned long guest_irq); 98 }; 99 100 struct kvmppc_xive { 101 struct kvm *kvm; 102 struct kvm_device *dev; 103 struct dentry *dentry; 104 105 /* VP block associated with the VM */ 106 u32 vp_base; 107 108 /* Blocks of sources */ 109 struct kvmppc_xive_src_block *src_blocks[KVMPPC_XICS_MAX_ICS_ID + 1]; 110 u32 max_sbid; 111 112 /* 113 * For state save, we lazily scan the queues on the first interrupt 114 * being migrated. We don't have a clean way to reset that flags 115 * so we keep track of the number of valid sources and how many of 116 * them were migrated so we can reset when all of them have been 117 * processed. 118 */ 119 u32 src_count; 120 u32 saved_src_count; 121 122 /* 123 * Some irqs are delayed on restore until the source is created, 124 * keep track here of how many of them 125 */ 126 u32 delayed_irqs; 127 128 /* Which queues (priorities) are in use by the guest */ 129 u8 qmap; 130 131 /* Queue orders */ 132 u32 q_order; 133 u32 q_page_order; 134 135 /* Flags */ 136 u8 single_escalation; 137 138 struct kvmppc_xive_ops *ops; 139 struct address_space *mapping; 140 struct mutex mapping_lock; 141 struct mutex lock; 142 }; 143 144 #define KVMPPC_XIVE_Q_COUNT 8 145 146 struct kvmppc_xive_vcpu { 147 struct kvmppc_xive *xive; 148 struct kvm_vcpu *vcpu; 149 bool valid; 150 151 /* Server number. This is the HW CPU ID from a guest perspective */ 152 u32 server_num; 153 154 /* 155 * HW VP corresponding to this VCPU. This is the base of the VP 156 * block plus the server number. 157 */ 158 u32 vp_id; 159 u32 vp_chip_id; 160 u32 vp_cam; 161 162 /* IPI used for sending ... IPIs */ 163 u32 vp_ipi; 164 struct xive_irq_data vp_ipi_data; 165 166 /* Local emulation state */ 167 uint8_t cppr; /* guest CPPR */ 168 uint8_t hw_cppr;/* Hardware CPPR */ 169 uint8_t mfrr; 170 uint8_t pending; 171 172 /* Each VP has 8 queues though we only provision some */ 173 struct xive_q queues[KVMPPC_XIVE_Q_COUNT]; 174 u32 esc_virq[KVMPPC_XIVE_Q_COUNT]; 175 char *esc_virq_names[KVMPPC_XIVE_Q_COUNT]; 176 177 /* Stash a delayed irq on restore from migration (see set_icp) */ 178 u32 delayed_irq; 179 180 /* Stats */ 181 u64 stat_rm_h_xirr; 182 u64 stat_rm_h_ipoll; 183 u64 stat_rm_h_cppr; 184 u64 stat_rm_h_eoi; 185 u64 stat_rm_h_ipi; 186 u64 stat_vm_h_xirr; 187 u64 stat_vm_h_ipoll; 188 u64 stat_vm_h_cppr; 189 u64 stat_vm_h_eoi; 190 u64 stat_vm_h_ipi; 191 }; 192 193 static inline struct kvm_vcpu *kvmppc_xive_find_server(struct kvm *kvm, u32 nr) 194 { 195 struct kvm_vcpu *vcpu = NULL; 196 int i; 197 198 kvm_for_each_vcpu(i, vcpu, kvm) { 199 if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num) 200 return vcpu; 201 } 202 return NULL; 203 } 204 205 static inline struct kvmppc_xive_src_block *kvmppc_xive_find_source(struct kvmppc_xive *xive, 206 u32 irq, u16 *source) 207 { 208 u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT; 209 u16 src = irq & KVMPPC_XICS_SRC_MASK; 210 211 if (source) 212 *source = src; 213 if (bid > KVMPPC_XICS_MAX_ICS_ID) 214 return NULL; 215 return xive->src_blocks[bid]; 216 } 217 218 static inline u32 kvmppc_xive_vp(struct kvmppc_xive *xive, u32 server) 219 { 220 return xive->vp_base + kvmppc_pack_vcpu_id(xive->kvm, server); 221 } 222 223 /* 224 * Mapping between guest priorities and host priorities 225 * is as follow. 226 * 227 * Guest request for 0...6 are honored. Guest request for anything 228 * higher results in a priority of 6 being applied. 229 * 230 * Similar mapping is done for CPPR values 231 */ 232 static inline u8 xive_prio_from_guest(u8 prio) 233 { 234 if (prio == 0xff || prio < 6) 235 return prio; 236 return 6; 237 } 238 239 static inline u8 xive_prio_to_guest(u8 prio) 240 { 241 return prio; 242 } 243 244 static inline u32 __xive_read_eq(__be32 *qpage, u32 msk, u32 *idx, u32 *toggle) 245 { 246 u32 cur; 247 248 if (!qpage) 249 return 0; 250 cur = be32_to_cpup(qpage + *idx); 251 if ((cur >> 31) == *toggle) 252 return 0; 253 *idx = (*idx + 1) & msk; 254 if (*idx == 0) 255 (*toggle) ^= 1; 256 return cur & 0x7fffffff; 257 } 258 259 extern unsigned long xive_rm_h_xirr(struct kvm_vcpu *vcpu); 260 extern unsigned long xive_rm_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server); 261 extern int xive_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server, 262 unsigned long mfrr); 263 extern int xive_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr); 264 extern int xive_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr); 265 266 extern unsigned long (*__xive_vm_h_xirr)(struct kvm_vcpu *vcpu); 267 extern unsigned long (*__xive_vm_h_ipoll)(struct kvm_vcpu *vcpu, unsigned long server); 268 extern int (*__xive_vm_h_ipi)(struct kvm_vcpu *vcpu, unsigned long server, 269 unsigned long mfrr); 270 extern int (*__xive_vm_h_cppr)(struct kvm_vcpu *vcpu, unsigned long cppr); 271 extern int (*__xive_vm_h_eoi)(struct kvm_vcpu *vcpu, unsigned long xirr); 272 273 /* 274 * Common Xive routines for XICS-over-XIVE and XIVE native 275 */ 276 void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu); 277 int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu); 278 struct kvmppc_xive_src_block *kvmppc_xive_create_src_block( 279 struct kvmppc_xive *xive, int irq); 280 void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb); 281 int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio); 282 int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio, 283 bool single_escalation); 284 struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type); 285 286 #endif /* CONFIG_KVM_XICS */ 287 #endif /* _KVM_PPC_BOOK3S_XICS_H */ 288