arch/powerpc/kvm/book3s_xive.h

   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         /* Number of entries in the VP block */
 139         u32     nr_servers;
 140
 141         struct kvmppc_xive_ops *ops;
 142         struct address_space   *mapping;
 143         struct mutex mapping_lock;
 144         struct mutex lock;
 145 };
 146
 147 #define KVMPPC_XIVE_Q_COUNT     8
 148
 149 struct kvmppc_xive_vcpu {
 150         struct kvmppc_xive      *xive;
 151         struct kvm_vcpu         *vcpu;
 152         bool                    valid;
 153
 154         /* Server number. This is the HW CPU ID from a guest perspective */
 155         u32                     server_num;
 156
 157         /*
 158          * HW VP corresponding to this VCPU. This is the base of the VP
 159          * block plus the server number.
 160          */
 161         u32                     vp_id;
 162         u32                     vp_chip_id;
 163         u32                     vp_cam;
 164
 165         /* IPI used for sending ... IPIs */
 166         u32                     vp_ipi;
 167         struct xive_irq_data    vp_ipi_data;
 168
 169         /* Local emulation state */
 170         uint8_t                 cppr;   /* guest CPPR */
 171         uint8_t                 hw_cppr;/* Hardware CPPR */
 172         uint8_t                 mfrr;
 173         uint8_t                 pending;
 174
 175         /* Each VP has 8 queues though we only provision some */
 176         struct xive_q           queues[KVMPPC_XIVE_Q_COUNT];
 177         u32                     esc_virq[KVMPPC_XIVE_Q_COUNT];
 178         char                    *esc_virq_names[KVMPPC_XIVE_Q_COUNT];
 179
 180         /* Stash a delayed irq on restore from migration (see set_icp) */
 181         u32                     delayed_irq;
 182
 183         /* Stats */
 184         u64                     stat_rm_h_xirr;
 185         u64                     stat_rm_h_ipoll;
 186         u64                     stat_rm_h_cppr;
 187         u64                     stat_rm_h_eoi;
 188         u64                     stat_rm_h_ipi;
 189         u64                     stat_vm_h_xirr;
 190         u64                     stat_vm_h_ipoll;
 191         u64                     stat_vm_h_cppr;
 192         u64                     stat_vm_h_eoi;
 193         u64                     stat_vm_h_ipi;
 194 };
 195
 196 static inline struct kvm_vcpu *kvmppc_xive_find_server(struct kvm *kvm, u32 nr)
 197 {
 198         struct kvm_vcpu *vcpu = NULL;
 199         int i;
 200
 201         kvm_for_each_vcpu(i, vcpu, kvm) {
 202                 if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num)
 203                         return vcpu;
 204         }
 205         return NULL;
 206 }
 207
 208 static inline struct kvmppc_xive_src_block *kvmppc_xive_find_source(struct kvmppc_xive *xive,
 209                 u32 irq, u16 *source)
 210 {
 211         u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT;
 212         u16 src = irq & KVMPPC_XICS_SRC_MASK;
 213
 214         if (source)
 215                 *source = src;
 216         if (bid > KVMPPC_XICS_MAX_ICS_ID)
 217                 return NULL;
 218         return xive->src_blocks[bid];
 219 }
 220
 221 /*
 222  * When the XIVE resources are allocated at the HW level, the VP
 223  * structures describing the vCPUs of a guest are distributed among
 224  * the chips to optimize the PowerBUS usage. For best performance, the
 225  * guest vCPUs can be pinned to match the VP structure distribution.
 226  *
 227  * Currently, the VP identifiers are deduced from the vCPU id using
 228  * the kvmppc_pack_vcpu_id() routine which is not incorrect but not
 229  * optimal either. It VSMT is used, the result is not continuous and
 230  * the constraints on HW resources described above can not be met.
 231  */
 232 static inline u32 kvmppc_xive_vp(struct kvmppc_xive *xive, u32 server)
 233 {
 234         return xive->vp_base + kvmppc_pack_vcpu_id(xive->kvm, server);
 235 }
 236
 237 static inline bool kvmppc_xive_vp_in_use(struct kvm *kvm, u32 vp_id)
 238 {
 239         struct kvm_vcpu *vcpu = NULL;
 240         int i;
 241
 242         kvm_for_each_vcpu(i, vcpu, kvm) {
 243                 if (vcpu->arch.xive_vcpu && vp_id == vcpu->arch.xive_vcpu->vp_id)
 244                         return true;
 245         }
 246         return false;
 247 }
 248
 249 /*
 250  * Mapping between guest priorities and host priorities
 251  * is as follow.
 252  *
 253  * Guest request for 0...6 are honored. Guest request for anything
 254  * higher results in a priority of 6 being applied.
 255  *
 256  * Similar mapping is done for CPPR values
 257  */
 258 static inline u8 xive_prio_from_guest(u8 prio)
 259 {
 260         if (prio == 0xff || prio < 6)
 261                 return prio;
 262         return 6;
 263 }
 264
 265 static inline u8 xive_prio_to_guest(u8 prio)
 266 {
 267         return prio;
 268 }
 269
 270 static inline u32 __xive_read_eq(__be32 *qpage, u32 msk, u32 *idx, u32 *toggle)
 271 {
 272         u32 cur;
 273
 274         if (!qpage)
 275                 return 0;
 276         cur = be32_to_cpup(qpage + *idx);
 277         if ((cur >> 31) == *toggle)
 278                 return 0;
 279         *idx = (*idx + 1) & msk;
 280         if (*idx == 0)
 281                 (*toggle) ^= 1;
 282         return cur & 0x7fffffff;
 283 }
 284
 285 extern unsigned long xive_rm_h_xirr(struct kvm_vcpu *vcpu);
 286 extern unsigned long xive_rm_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server);
 287 extern int xive_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
 288                          unsigned long mfrr);
 289 extern int xive_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);
 290 extern int xive_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr);
 291
 292 extern unsigned long (*__xive_vm_h_xirr)(struct kvm_vcpu *vcpu);
 293 extern unsigned long (*__xive_vm_h_ipoll)(struct kvm_vcpu *vcpu, unsigned long server);
 294 extern int (*__xive_vm_h_ipi)(struct kvm_vcpu *vcpu, unsigned long server,
 295                               unsigned long mfrr);
 296 extern int (*__xive_vm_h_cppr)(struct kvm_vcpu *vcpu, unsigned long cppr);
 297 extern int (*__xive_vm_h_eoi)(struct kvm_vcpu *vcpu, unsigned long xirr);
 298
 299 /*
 300  * Common Xive routines for XICS-over-XIVE and XIVE native
 301  */
 302 void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu);
 303 int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu);
 304 void kvmppc_xive_debug_show_sources(struct seq_file *m,
 305                                     struct kvmppc_xive_src_block *sb);
 306 struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
 307         struct kvmppc_xive *xive, int irq);
 308 void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb);
 309 int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio);
 310 int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio,
 311                                   bool single_escalation);
 312 struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type);
 313 void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu,
 314                                     struct kvmppc_xive_vcpu *xc, int irq);
 315 int kvmppc_xive_compute_vp_id(struct kvmppc_xive *xive, u32 cpu, u32 *vp);
 316 int kvmppc_xive_set_nr_servers(struct kvmppc_xive *xive, u64 addr);
 317
 318 #endif /* CONFIG_KVM_XICS */
 319 #endif /* _KVM_PPC_BOOK3S_XICS_H */