arch/powerpc/kvm/book3s_xive.h

   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 */