sys/xen/evtchn/evtchn.c

   1 /******************************************************************************
   2  * evtchn.c
   3  *
   4  * Communication via Xen event channels.
   5  *
   6  * Copyright (c) 2002-2005, K A Fraser
   7  * Copyright (c) 2005-2006 Kip Macy
   8  */
   9
  10 #include <sys/cdefs.h>
  11 __FBSDID("$FreeBSD$");
  12
  13 #include <sys/param.h>
  14 #include <sys/systm.h>
  15 #include <sys/bus.h>
  16 #include <sys/limits.h>
  17 #include <sys/malloc.h>
  18 #include <sys/kernel.h>
  19 #include <sys/lock.h>
  20 #include <sys/mutex.h>
  21 #include <sys/interrupt.h>
  22 #include <sys/pcpu.h>
  23 #include <sys/smp.h>
  24
  25 #include <machine/cpufunc.h>
  26 #include <machine/intr_machdep.h>
  27
  28 #include <machine/xen/xen-os.h>
  29 #include <machine/xen/xenvar.h>
  30 #include <xen/xen_intr.h>
  31 #include <machine/xen/synch_bitops.h>
  32 #include <xen/evtchn.h>
  33 #include <xen/hypervisor.h>
  34 #include <sys/smp.h>
  35
  36 #include <xen/xen_intr.h>
  37 #include <xen/evtchn.h>
  38
  39 static inline unsigned long __ffs(unsigned long word)
  40 {
  41         __asm__("bsfl %1,%0"
  42                 :"=r" (word)
  43                 :"rm" (word));
  44         return word;
  45 }
  46
  47 static struct mtx irq_mapping_update_lock;
  48 static struct xenpic *xp;
  49 struct xenpic_intsrc {
  50         struct intsrc     xp_intsrc;
  51         void              *xp_cookie;
  52         uint8_t           xp_vector;
  53         boolean_t         xp_masked;
  54 };
  55
  56 struct xenpic {
  57         struct pic           *xp_dynirq_pic;
  58         struct pic           *xp_pirq_pic;
  59         uint16_t             xp_numintr;
  60         struct xenpic_intsrc xp_pins[0];
  61 };
  62
  63 #define TODO            printf("%s: not implemented!\n", __func__)
  64
  65 /* IRQ <-> event-channel mappings. */
  66 static int evtchn_to_irq[NR_EVENT_CHANNELS];
  67
  68 /* Packed IRQ information: binding type, sub-type index, and event channel. */
  69 static uint32_t irq_info[NR_IRQS];
  70 /* Binding types. */
  71 enum {
  72         IRQT_UNBOUND,
  73         IRQT_PIRQ,
  74         IRQT_VIRQ,
  75         IRQT_IPI,
  76         IRQT_LOCAL_PORT,
  77         IRQT_CALLER_PORT,
  78         _IRQT_COUNT
  79
  80 };
  81
  82
  83 #define _IRQT_BITS 4
  84 #define _EVTCHN_BITS 12
  85 #define _INDEX_BITS (32 - _IRQT_BITS - _EVTCHN_BITS)
  86
  87 /* Constructor for packed IRQ information. */
  88 static inline uint32_t
  89 mk_irq_info(uint32_t type, uint32_t index, uint32_t evtchn)
  90 {
  91
  92         return ((type << (32 - _IRQT_BITS)) | (index << _EVTCHN_BITS) | evtchn);
  93 }
  94
  95 /* Constructor for packed IRQ information. */
  96
  97 /* Convenient shorthand for packed representation of an unbound IRQ. */
  98 #define IRQ_UNBOUND     mk_irq_info(IRQT_UNBOUND, 0, 0)
  99
 100 /*
 101  * Accessors for packed IRQ information.
 102  */
 103
 104 static inline unsigned int evtchn_from_irq(int irq)
 105 {
 106         return irq_info[irq] & ((1U << _EVTCHN_BITS) - 1);
 107 }
 108
 109 static inline unsigned int index_from_irq(int irq)
 110 {
 111         return (irq_info[irq] >> _EVTCHN_BITS) & ((1U << _INDEX_BITS) - 1);
 112 }
 113
 114 static inline unsigned int type_from_irq(int irq)
 115 {
 116         return irq_info[irq] >> (32 - _IRQT_BITS);
 117 }
 118
 119
 120 /* IRQ <-> VIRQ mapping. */
 121
 122 /* IRQ <-> IPI mapping. */
 123 #ifndef NR_IPIS
 124 #ifdef SMP
 125 #error "NR_IPIS not defined"
 126 #endif
 127 #define NR_IPIS 1
 128 #endif
 129
 130 /* Bitmap indicating which PIRQs require Xen to be notified on unmask. */
 131 static unsigned long pirq_needs_unmask_notify[NR_PIRQS/sizeof(unsigned long)];
 132
 133 /* Reference counts for bindings to IRQs. */
 134 static int irq_bindcount[NR_IRQS];
 135
 136 #define VALID_EVTCHN(_chn) ((_chn) != 0)
 137
 138 #ifdef SMP
 139
 140 static uint8_t cpu_evtchn[NR_EVENT_CHANNELS];
 141 static unsigned long cpu_evtchn_mask[MAX_VIRT_CPUS][NR_EVENT_CHANNELS/LONG_BIT];
 142
 143 #define active_evtchns(cpu,sh,idx)              \
 144         ((sh)->evtchn_pending[idx] &            \
 145          cpu_evtchn_mask[cpu][idx] &            \
 146          ~(sh)->evtchn_mask[idx])
 147
 148 static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
 149 {
 150         clear_bit(chn, (unsigned long *)cpu_evtchn_mask[cpu_evtchn[chn]]);
 151         set_bit(chn, (unsigned long *)cpu_evtchn_mask[cpu]);
 152         cpu_evtchn[chn] = cpu;
 153 }
 154
 155 static void init_evtchn_cpu_bindings(void)
 156 {
 157         /* By default all event channels notify CPU#0. */
 158         memset(cpu_evtchn, 0, sizeof(cpu_evtchn));
 159         memset(cpu_evtchn_mask[0], ~0, sizeof(cpu_evtchn_mask[0]));
 160 }
 161
 162 #define cpu_from_evtchn(evtchn)         (cpu_evtchn[evtchn])
 163
 164 #else
 165
 166 #define active_evtchns(cpu,sh,idx)              \
 167         ((sh)->evtchn_pending[idx] &            \
 168          ~(sh)->evtchn_mask[idx])
 169 #define bind_evtchn_to_cpu(chn,cpu)     ((void)0)
 170 #define init_evtchn_cpu_bindings()      ((void)0)
 171 #define cpu_from_evtchn(evtchn)         (0)
 172
 173 #endif
 174
 175
 176 /*
 177  * Force a proper event-channel callback from Xen after clearing the
 178  * callback mask. We do this in a very simple manner, by making a call
 179  * down into Xen. The pending flag will be checked by Xen on return.
 180  */
 181 void force_evtchn_callback(void)
 182 {
 183         (void)HYPERVISOR_xen_version(0, NULL);
 184 }
 185
 186 void
 187 evtchn_do_upcall(struct trapframe *frame)
 188 {
 189         unsigned long  l1, l2;
 190         unsigned int   l1i, l2i, port;
 191         int            irq, cpu;
 192         shared_info_t *s;
 193         vcpu_info_t   *vcpu_info;
 194
 195         cpu = PCPU_GET(cpuid);
 196         s = HYPERVISOR_shared_info;
 197         vcpu_info = &s->vcpu_info[cpu];
 198
 199         vcpu_info->evtchn_upcall_pending = 0;
 200
 201         /* NB. No need for a barrier here -- XCHG is a barrier on x86. */
 202         l1 = xen_xchg(&vcpu_info->evtchn_pending_sel, 0);
 203
 204         while (l1 != 0) {
 205                 l1i = __ffs(l1);
 206                 l1 &= ~(1 << l1i);
 207
 208                 while ((l2 = active_evtchns(cpu, s, l1i)) != 0) {
 209                         l2i = __ffs(l2);
 210
 211                         port = (l1i * LONG_BIT) + l2i;
 212                         if ((irq = evtchn_to_irq[port]) != -1) {
 213                                 struct intsrc *isrc = intr_lookup_source(irq);
 214                                 /*
 215                                  * ack
 216                                  */
 217                                 mask_evtchn(port);
 218                                 clear_evtchn(port);
 219
 220                                 intr_execute_handlers(isrc, frame);
 221                         } else {
 222                                 evtchn_device_upcall(port);
 223                         }
 224                 }
 225         }
 226 }
 227
 228 /*
 229  * Send an IPI from the current CPU to the destination CPU.
 230  */
 231 void
 232 ipi_pcpu(unsigned int cpu, int vector)
 233 {
 234         int irq;
 235
 236         irq = pcpu_find(cpu)->pc_ipi_to_irq[vector];
 237
 238         notify_remote_via_irq(irq);
 239 }
 240
 241 static int
 242 find_unbound_irq(void)
 243 {
 244         int dynirq, irq;
 245
 246         for (dynirq = 0; dynirq < NR_IRQS; dynirq++) {
 247                 irq = dynirq_to_irq(dynirq);
 248                 if (irq_bindcount[irq] == 0)
 249                         break;
 250         }
 251
 252         if (irq == NR_IRQS)
 253                 panic("No available IRQ to bind to: increase NR_IRQS!\n");
 254
 255         return (irq);
 256 }
 257
 258 static int
 259 bind_caller_port_to_irq(unsigned int caller_port)
 260 {
 261         int irq;
 262
 263         mtx_lock_spin(&irq_mapping_update_lock);
 264
 265         if ((irq = evtchn_to_irq[caller_port]) == -1) {
 266                 if ((irq = find_unbound_irq()) < 0)
 267                         goto out;
 268
 269                 evtchn_to_irq[caller_port] = irq;
 270                 irq_info[irq] = mk_irq_info(IRQT_CALLER_PORT, 0, caller_port);
 271         }
 272
 273         irq_bindcount[irq]++;
 274         unmask_evtchn(caller_port);
 275
 276  out:
 277         mtx_unlock_spin(&irq_mapping_update_lock);
 278         return irq;
 279 }
 280
 281 static int
 282 bind_local_port_to_irq(unsigned int local_port)
 283 {
 284         int irq;
 285
 286         mtx_lock_spin(&irq_mapping_update_lock);
 287
 288         KASSERT(evtchn_to_irq[local_port] == -1,
 289             ("evtchn_to_irq inconsistent"));
 290
 291         if ((irq = find_unbound_irq()) < 0) {
 292                 struct evtchn_close close = { .port = local_port };
 293                 HYPERVISOR_event_channel_op(EVTCHNOP_close, &close);
 294
 295                 goto out;
 296         }
 297
 298         evtchn_to_irq[local_port] = irq;
 299         irq_info[irq] = mk_irq_info(IRQT_LOCAL_PORT, 0, local_port);
 300         irq_bindcount[irq]++;
 301         unmask_evtchn(local_port);
 302
 303  out:
 304         mtx_unlock_spin(&irq_mapping_update_lock);
 305         return irq;
 306 }
 307
 308 static int
 309 bind_listening_port_to_irq(unsigned int remote_domain)
 310 {
 311         struct evtchn_alloc_unbound alloc_unbound;
 312         int err;
 313
 314         alloc_unbound.dom        = DOMID_SELF;
 315         alloc_unbound.remote_dom = remote_domain;
 316
 317         err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
 318                                           &alloc_unbound);
 319
 320         return err ? : bind_local_port_to_irq(alloc_unbound.port);
 321 }
 322
 323 static int
 324 bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
 325     unsigned int remote_port)
 326 {
 327         struct evtchn_bind_interdomain bind_interdomain;
 328         int err;
 329
 330         bind_interdomain.remote_dom  = remote_domain;
 331         bind_interdomain.remote_port = remote_port;
 332
 333         err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
 334                                           &bind_interdomain);
 335
 336         return err ? : bind_local_port_to_irq(bind_interdomain.local_port);
 337 }
 338
 339 static int
 340 bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 341 {
 342         struct evtchn_bind_virq bind_virq;
 343         int evtchn = 0, irq;
 344
 345         mtx_lock_spin(&irq_mapping_update_lock);
 346
 347         if ((irq = pcpu_find(cpu)->pc_virq_to_irq[virq]) == -1) {
 348                 if ((irq = find_unbound_irq()) < 0)
 349                         goto out;
 350
 351                 bind_virq.virq = virq;
 352                 bind_virq.vcpu = cpu;
 353                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, &bind_virq);
 354
 355                 evtchn = bind_virq.port;
 356
 357                 evtchn_to_irq[evtchn] = irq;
 358                 irq_info[irq] = mk_irq_info(IRQT_VIRQ, virq, evtchn);
 359
 360                 pcpu_find(cpu)->pc_virq_to_irq[virq] = irq;
 361
 362                 bind_evtchn_to_cpu(evtchn, cpu);
 363         }
 364
 365         irq_bindcount[irq]++;
 366         unmask_evtchn(evtchn);
 367 out:
 368         mtx_unlock_spin(&irq_mapping_update_lock);
 369
 370         return irq;
 371 }
 372
 373
 374 extern int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu);
 375
 376 int
 377 bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
 378 {
 379         struct evtchn_bind_ipi bind_ipi;
 380         int irq;
 381         int evtchn = 0;
 382
 383         mtx_lock_spin(&irq_mapping_update_lock);
 384
 385         if ((irq = pcpu_find(cpu)->pc_ipi_to_irq[ipi]) == -1) {
 386                 if ((irq = find_unbound_irq()) < 0)
 387                         goto out;
 388
 389                 bind_ipi.vcpu = cpu;
 390                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, &bind_ipi);
 391                 evtchn = bind_ipi.port;
 392
 393                 evtchn_to_irq[evtchn] = irq;
 394                 irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn);
 395
 396                 pcpu_find(cpu)->pc_ipi_to_irq[ipi] = irq;
 397
 398                 bind_evtchn_to_cpu(evtchn, cpu);
 399         }
 400         irq_bindcount[irq]++;
 401         unmask_evtchn(evtchn);
 402 out:
 403
 404         mtx_unlock_spin(&irq_mapping_update_lock);
 405
 406         return irq;
 407 }
 408
 409
 410 static void
 411 unbind_from_irq(int irq)
 412 {
 413         struct evtchn_close close;
 414         int evtchn = evtchn_from_irq(irq);
 415         int cpu;
 416
 417         mtx_lock_spin(&irq_mapping_update_lock);
 418
 419         if ((--irq_bindcount[irq] == 0) && VALID_EVTCHN(evtchn)) {
 420                 close.port = evtchn;
 421                 HYPERVISOR_event_channel_op(EVTCHNOP_close, &close);
 422
 423                 switch (type_from_irq(irq)) {
 424                 case IRQT_VIRQ:
 425                         cpu = cpu_from_evtchn(evtchn);
 426                         pcpu_find(cpu)->pc_virq_to_irq[index_from_irq(irq)] = -1;
 427                         break;
 428                 case IRQT_IPI:
 429                         cpu = cpu_from_evtchn(evtchn);
 430                         pcpu_find(cpu)->pc_ipi_to_irq[index_from_irq(irq)] = -1;
 431                         break;
 432                 default:
 433                         break;
 434                 }
 435
 436                 /* Closed ports are implicitly re-bound to VCPU0. */
 437                 bind_evtchn_to_cpu(evtchn, 0);
 438
 439                 evtchn_to_irq[evtchn] = -1;
 440                 irq_info[irq] = IRQ_UNBOUND;
 441         }
 442
 443         mtx_unlock_spin(&irq_mapping_update_lock);
 444 }
 445
 446 int
 447 bind_caller_port_to_irqhandler(unsigned int caller_port,
 448     const char *devname, driver_intr_t handler, void *arg,
 449     unsigned long irqflags, unsigned int *irqp)
 450 {
 451         unsigned int irq;
 452         int error;
 453
 454         irq = bind_caller_port_to_irq(caller_port);
 455         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 456         error = intr_add_handler(devname, irq, NULL, handler, arg, irqflags,
 457             &xp->xp_pins[irq].xp_cookie);
 458
 459         if (error) {
 460                 unbind_from_irq(irq);
 461                 return (error);
 462         }
 463
 464         if (irqp)
 465                 *irqp = irq;
 466
 467         return (0);
 468 }
 469
 470 int
 471 bind_listening_port_to_irqhandler(unsigned int remote_domain,
 472     const char *devname, driver_intr_t handler, void *arg,
 473     unsigned long irqflags, unsigned int *irqp)
 474 {
 475         unsigned int irq;
 476         int error;
 477
 478         irq = bind_listening_port_to_irq(remote_domain);
 479         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 480         error = intr_add_handler(devname, irq, NULL, handler, arg, irqflags,
 481             &xp->xp_pins[irq].xp_cookie);
 482         if (error) {
 483                 unbind_from_irq(irq);
 484                 return (error);
 485         }
 486         if (irqp)
 487                 *irqp = irq;
 488
 489         return (0);
 490 }
 491
 492 int
 493 bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
 494     unsigned int remote_port, const char *devname,
 495     driver_filter_t filter, driver_intr_t handler,
 496     unsigned long irqflags, unsigned int *irqp)
 497 {
 498         unsigned int irq;
 499         int error;
 500
 501         irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
 502         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 503         error = intr_add_handler(devname, irq, filter, handler, NULL,
 504             irqflags, &xp->xp_pins[irq].xp_cookie);
 505         if (error) {
 506                 unbind_from_irq(irq);
 507                 return (error);
 508         }
 509
 510         if (irqp)
 511                 *irqp = irq;
 512         return (0);
 513 }
 514
 515 int
 516 bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
 517     const char *devname, driver_filter_t filter, driver_intr_t handler,
 518     void *arg, unsigned long irqflags, unsigned int *irqp)
 519 {
 520         unsigned int irq;
 521         int error;
 522
 523         irq = bind_virq_to_irq(virq, cpu);
 524         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 525         error = intr_add_handler(devname, irq, filter, handler,
 526             arg, irqflags, &xp->xp_pins[irq].xp_cookie);
 527         if (error) {
 528                 unbind_from_irq(irq);
 529                 return (error);
 530         }
 531
 532         if (irqp)
 533                 *irqp = irq;
 534         return (0);
 535 }
 536
 537 int
 538 bind_ipi_to_irqhandler(unsigned int ipi, unsigned int cpu,
 539     const char *devname, driver_filter_t filter,
 540     unsigned long irqflags, unsigned int *irqp)
 541 {
 542         unsigned int irq;
 543         int error;
 544
 545         irq = bind_ipi_to_irq(ipi, cpu);
 546         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 547         error = intr_add_handler(devname, irq, filter, NULL,
 548             NULL, irqflags, &xp->xp_pins[irq].xp_cookie);
 549         if (error) {
 550                 unbind_from_irq(irq);
 551                 return (error);
 552         }
 553
 554         if (irqp)
 555                 *irqp = irq;
 556         return (0);
 557 }
 558
 559 void
 560 unbind_from_irqhandler(unsigned int irq)
 561 {
 562         intr_remove_handler(xp->xp_pins[irq].xp_cookie);
 563         unbind_from_irq(irq);
 564 }
 565
 566 #if 0
 567 /* Rebind an evtchn so that it gets delivered to a specific cpu */
 568 static void
 569 rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
 570 {
 571         evtchn_op_t op = { .cmd = EVTCHNOP_bind_vcpu };
 572         int evtchn;
 573
 574         mtx_lock_spin(&irq_mapping_update_lock);
 575
 576         evtchn = evtchn_from_irq(irq);
 577         if (!VALID_EVTCHN(evtchn)) {
 578                 mtx_unlock_spin(&irq_mapping_update_lock);
 579                 return;
 580         }
 581
 582         /* Send future instances of this interrupt to other vcpu. */
 583         bind_vcpu.port = evtchn;
 584         bind_vcpu.vcpu = tcpu;
 585
 586         /*
 587          * If this fails, it usually just indicates that we're dealing with a
 588          * virq or IPI channel, which don't actually need to be rebound. Ignore
 589          * it, but don't do the xenlinux-level rebind in that case.
 590          */
 591         if (HYPERVISOR_event_channel_op(&op) >= 0)
 592                 bind_evtchn_to_cpu(evtchn, tcpu);
 593
 594         mtx_unlock_spin(&irq_mapping_update_lock);
 595
 596 }
 597
 598 static void set_affinity_irq(unsigned irq, cpumask_t dest)
 599 {
 600         unsigned tcpu = ffs(dest) - 1;
 601         rebind_irq_to_cpu(irq, tcpu);
 602 }
 603 #endif
 604
 605 /*
 606  * Interface to generic handling in intr_machdep.c
 607  */
 608
 609
 610 /*------------ interrupt handling --------------------------------------*/
 611 #define TODO            printf("%s: not implemented!\n", __func__)
 612
 613
 614 static void     xenpic_dynirq_enable_source(struct intsrc *isrc);
 615 static void     xenpic_dynirq_disable_source(struct intsrc *isrc, int);
 616 static void     xenpic_dynirq_eoi_source(struct intsrc *isrc);
 617 static void     xenpic_dynirq_enable_intr(struct intsrc *isrc);
 618
 619 static void     xenpic_pirq_enable_source(struct intsrc *isrc);
 620 static void     xenpic_pirq_disable_source(struct intsrc *isrc, int);
 621 static void     xenpic_pirq_eoi_source(struct intsrc *isrc);
 622 static void     xenpic_pirq_enable_intr(struct intsrc *isrc);
 623
 624
 625 static int      xenpic_vector(struct intsrc *isrc);
 626 static int      xenpic_source_pending(struct intsrc *isrc);
 627 static void     xenpic_suspend(struct pic* pic);
 628 static void     xenpic_resume(struct pic* pic);
 629 static int      xenpic_assign_cpu(struct intsrc *, u_int apic_id);
 630
 631
 632 struct pic xenpic_dynirq_template  =  {
 633         .pic_enable_source      =       xenpic_dynirq_enable_source,
 634         .pic_disable_source     =       xenpic_dynirq_disable_source,
 635         .pic_eoi_source         =       xenpic_dynirq_eoi_source,
 636         .pic_enable_intr        =       xenpic_dynirq_enable_intr,
 637         .pic_vector             =       xenpic_vector,
 638         .pic_source_pending     =       xenpic_source_pending,
 639         .pic_suspend            =       xenpic_suspend,
 640         .pic_resume             =       xenpic_resume
 641 };
 642
 643 struct pic xenpic_pirq_template  =  {
 644         .pic_enable_source      =       xenpic_pirq_enable_source,
 645         .pic_disable_source     =       xenpic_pirq_disable_source,
 646         .pic_eoi_source         =       xenpic_pirq_eoi_source,
 647         .pic_enable_intr        =       xenpic_pirq_enable_intr,
 648         .pic_vector             =       xenpic_vector,
 649         .pic_source_pending     =       xenpic_source_pending,
 650         .pic_suspend            =       xenpic_suspend,
 651         .pic_resume             =       xenpic_resume,
 652         .pic_assign_cpu         =       xenpic_assign_cpu
 653 };
 654
 655
 656
 657 void
 658 xenpic_dynirq_enable_source(struct intsrc *isrc)
 659 {
 660         unsigned int irq;
 661         struct xenpic_intsrc *xp;
 662
 663         xp = (struct xenpic_intsrc *)isrc;
 664
 665         mtx_lock_spin(&irq_mapping_update_lock);
 666         if (xp->xp_masked) {
 667                 irq = xenpic_vector(isrc);
 668                 unmask_evtchn(evtchn_from_irq(irq));
 669                 xp->xp_masked = FALSE;
 670         }
 671         mtx_unlock_spin(&irq_mapping_update_lock);
 672 }
 673
 674 static void
 675 xenpic_dynirq_disable_source(struct intsrc *isrc, int foo)
 676 {
 677         unsigned int irq;
 678         struct xenpic_intsrc *xp;
 679
 680         xp = (struct xenpic_intsrc *)isrc;
 681
 682         mtx_lock_spin(&irq_mapping_update_lock);
 683         if (!xp->xp_masked) {
 684                 irq = xenpic_vector(isrc);
 685                 mask_evtchn(evtchn_from_irq(irq));
 686                 xp->xp_masked = TRUE;
 687         }
 688         mtx_unlock_spin(&irq_mapping_update_lock);
 689 }
 690
 691 static void
 692 xenpic_dynirq_enable_intr(struct intsrc *isrc)
 693 {
 694         unsigned int irq;
 695         struct xenpic_intsrc *xp;
 696
 697         xp = (struct xenpic_intsrc *)isrc;
 698         mtx_lock_spin(&irq_mapping_update_lock);
 699         xp->xp_masked = 0;
 700         irq = xenpic_vector(isrc);
 701         unmask_evtchn(evtchn_from_irq(irq));
 702         mtx_unlock_spin(&irq_mapping_update_lock);
 703 }
 704
 705 static void
 706 xenpic_dynirq_eoi_source(struct intsrc *isrc)
 707 {
 708         unsigned int irq;
 709         struct xenpic_intsrc *xp;
 710
 711         xp = (struct xenpic_intsrc *)isrc;
 712         mtx_lock_spin(&irq_mapping_update_lock);
 713         xp->xp_masked = 0;
 714         irq = xenpic_vector(isrc);
 715         unmask_evtchn(evtchn_from_irq(irq));
 716         mtx_unlock_spin(&irq_mapping_update_lock);
 717 }
 718
 719 static int
 720 xenpic_vector(struct intsrc *isrc)
 721 {
 722     struct xenpic_intsrc *pin;
 723
 724     pin = (struct xenpic_intsrc *)isrc;
 725    //printf("xenpic_vector(): isrc=%p,vector=%u\n", pin, pin->xp_vector);
 726
 727     return (pin->xp_vector);
 728 }
 729
 730 static int
 731 xenpic_source_pending(struct intsrc *isrc)
 732 {
 733     struct xenpic_intsrc *pin = (struct xenpic_intsrc *)isrc;
 734
 735         /* XXXEN: TODO */
 736         printf("xenpic_source_pending(): vector=%x,masked=%x\n",
 737             pin->xp_vector, pin->xp_masked);
 738
 739 /*      notify_remote_via_evtchn(pin->xp_vector); // XXX RS: Is this correct? */
 740         return 0;
 741 }
 742
 743 static void
 744 xenpic_suspend(struct pic* pic)
 745 {
 746         TODO;
 747 }
 748
 749 static void
 750 xenpic_resume(struct pic* pic)
 751 {
 752         TODO;
 753 }
 754
 755 static int
 756 xenpic_assign_cpu(struct intsrc *isrc, u_int apic_id)
 757 {
 758         TODO;
 759         return (EOPNOTSUPP);
 760 }
 761
 762 void
 763 notify_remote_via_irq(int irq)
 764 {
 765         int evtchn = evtchn_from_irq(irq);
 766
 767         if (VALID_EVTCHN(evtchn))
 768                 notify_remote_via_evtchn(evtchn);
 769         else
 770                 panic("invalid evtchn %d", irq);
 771 }
 772
 773 /* required for support of physical devices */
 774 static inline void
 775 pirq_unmask_notify(int pirq)
 776 {
 777         struct physdev_eoi eoi = { .irq = pirq };
 778
 779         if (unlikely(test_bit(pirq, &pirq_needs_unmask_notify[0]))) {
 780                 (void)HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
 781         }
 782 }
 783
 784 static inline void
 785 pirq_query_unmask(int pirq)
 786 {
 787         struct physdev_irq_status_query irq_status_query;
 788
 789         irq_status_query.irq = pirq;
 790         (void)HYPERVISOR_physdev_op(PHYSDEVOP_IRQ_STATUS_QUERY, &irq_status_query);
 791         clear_bit(pirq, &pirq_needs_unmask_notify[0]);
 792         if ( irq_status_query.flags & PHYSDEVOP_IRQ_NEEDS_UNMASK_NOTIFY )
 793                 set_bit(pirq, &pirq_needs_unmask_notify[0]);
 794 }
 795
 796 /*
 797  * On startup, if there is no action associated with the IRQ then we are
 798  * probing. In this case we should not share with others as it will confuse us.
 799  */
 800 #define probing_irq(_irq) (intr_lookup_source(irq) == NULL)
 801
 802 static void
 803 xenpic_pirq_enable_intr(struct intsrc *isrc)
 804 {
 805         struct evtchn_bind_pirq bind_pirq;
 806         int evtchn;
 807         unsigned int irq;
 808
 809         mtx_lock_spin(&irq_mapping_update_lock);
 810         irq = xenpic_vector(isrc);
 811         evtchn = evtchn_from_irq(irq);
 812
 813         if (VALID_EVTCHN(evtchn))
 814                 goto out;
 815
 816         bind_pirq.pirq  = irq;
 817         /* NB. We are happy to share unless we are probing. */
 818         bind_pirq.flags = probing_irq(irq) ? 0 : BIND_PIRQ__WILL_SHARE;
 819
 820         if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq) != 0) {
 821 #ifndef XEN_PRIVILEGED_GUEST
 822                 panic("unexpected pirq call");
 823 #endif
 824                 if (!probing_irq(irq)) /* Some failures are expected when probing. */
 825                         printf("Failed to obtain physical IRQ %d\n", irq);
 826                 mtx_unlock_spin(&irq_mapping_update_lock);
 827                 return;
 828         }
 829         evtchn = bind_pirq.port;
 830
 831         pirq_query_unmask(irq_to_pirq(irq));
 832
 833         bind_evtchn_to_cpu(evtchn, 0);
 834         evtchn_to_irq[evtchn] = irq;
 835         irq_info[irq] = mk_irq_info(IRQT_PIRQ, irq, evtchn);
 836
 837  out:
 838         unmask_evtchn(evtchn);
 839         pirq_unmask_notify(irq_to_pirq(irq));
 840         mtx_unlock_spin(&irq_mapping_update_lock);
 841 }
 842
 843 static void
 844 xenpic_pirq_enable_source(struct intsrc *isrc)
 845 {
 846         int evtchn;
 847         unsigned int irq;
 848
 849         mtx_lock_spin(&irq_mapping_update_lock);
 850         irq = xenpic_vector(isrc);
 851         evtchn = evtchn_from_irq(irq);
 852
 853         if (!VALID_EVTCHN(evtchn))
 854                 goto done;
 855
 856         unmask_evtchn(evtchn);
 857         pirq_unmask_notify(irq_to_pirq(irq));
 858  done:
 859         mtx_unlock_spin(&irq_mapping_update_lock);
 860 }
 861
 862 static void
 863 xenpic_pirq_disable_source(struct intsrc *isrc, int eoi)
 864 {
 865         int evtchn;
 866         unsigned int irq;
 867
 868         mtx_lock_spin(&irq_mapping_update_lock);
 869         irq = xenpic_vector(isrc);
 870         evtchn = evtchn_from_irq(irq);
 871
 872         if (!VALID_EVTCHN(evtchn))
 873                 goto done;
 874
 875         mask_evtchn(evtchn);
 876  done:
 877         mtx_unlock_spin(&irq_mapping_update_lock);
 878 }
 879
 880
 881 static void
 882 xenpic_pirq_eoi_source(struct intsrc *isrc)
 883 {
 884         int evtchn;
 885         unsigned int irq;
 886
 887         mtx_lock_spin(&irq_mapping_update_lock);
 888         irq = xenpic_vector(isrc);
 889         evtchn = evtchn_from_irq(irq);
 890
 891         if (!VALID_EVTCHN(evtchn))
 892                 goto done;
 893
 894         unmask_evtchn(evtchn);
 895         pirq_unmask_notify(irq_to_pirq(irq));
 896  done:
 897         mtx_unlock_spin(&irq_mapping_update_lock);
 898 }
 899
 900 int
 901 irq_to_evtchn_port(int irq)
 902 {
 903         return evtchn_from_irq(irq);
 904 }
 905
 906 void
 907 mask_evtchn(int port)
 908 {
 909         shared_info_t *s = HYPERVISOR_shared_info;
 910         synch_set_bit(port, &s->evtchn_mask[0]);
 911 }
 912
 913 void
 914 unmask_evtchn(int port)
 915 {
 916         shared_info_t *s = HYPERVISOR_shared_info;
 917         unsigned int cpu = PCPU_GET(cpuid);
 918         vcpu_info_t *vcpu_info = &s->vcpu_info[cpu];
 919
 920         /* Slow path (hypercall) if this is a non-local port. */
 921         if (unlikely(cpu != cpu_from_evtchn(port))) {
 922                 struct evtchn_unmask unmask = { .port = port };
 923                 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
 924                 return;
 925         }
 926
 927         synch_clear_bit(port, &s->evtchn_mask);
 928
 929         /*
 930          * The following is basically the equivalent of 'hw_resend_irq'. Just
 931          * like a real IO-APIC we 'lose the interrupt edge' if the channel is
 932          * masked.
 933          */
 934         if (synch_test_bit(port, &s->evtchn_pending) &&
 935             !synch_test_and_set_bit(port / LONG_BIT,
 936                                     &vcpu_info->evtchn_pending_sel)) {
 937                 vcpu_info->evtchn_upcall_pending = 1;
 938                 if (!vcpu_info->evtchn_upcall_mask)
 939                         force_evtchn_callback();
 940         }
 941 }
 942
 943 void irq_resume(void)
 944 {
 945         evtchn_op_t op;
 946         int         cpu, pirq, virq, ipi, irq, evtchn;
 947
 948         struct evtchn_bind_virq bind_virq;
 949         struct evtchn_bind_ipi bind_ipi;
 950
 951         init_evtchn_cpu_bindings();
 952
 953         /* New event-channel space is not 'live' yet. */
 954         for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
 955                 mask_evtchn(evtchn);
 956
 957         /* Check that no PIRQs are still bound. */
 958         for (pirq = 0; pirq < NR_PIRQS; pirq++) {
 959                 KASSERT(irq_info[pirq_to_irq(pirq)] == IRQ_UNBOUND,
 960                     ("pirq_to_irq inconsistent"));
 961         }
 962
 963         /* Secondary CPUs must have no VIRQ or IPI bindings. */
 964         for (cpu = 1; cpu < MAX_VIRT_CPUS; cpu++) {
 965                 for (virq = 0; virq < NR_VIRQS; virq++) {
 966                         KASSERT(pcpu_find(cpu)->pc_virq_to_irq[virq] == -1,
 967                             ("virq_to_irq inconsistent"));
 968                 }
 969                 for (ipi = 0; ipi < NR_IPIS; ipi++) {
 970                         KASSERT(pcpu_find(cpu)->pc_ipi_to_irq[ipi] == -1,
 971                             ("ipi_to_irq inconsistent"));
 972                 }
 973         }
 974
 975         /* No IRQ <-> event-channel mappings. */
 976         for (irq = 0; irq < NR_IRQS; irq++)
 977                 irq_info[irq] &= ~0xFFFF; /* zap event-channel binding */
 978         for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
 979                 evtchn_to_irq[evtchn] = -1;
 980
 981         /* Primary CPU: rebind VIRQs automatically. */
 982         for (virq = 0; virq < NR_VIRQS; virq++) {
 983                 if ((irq = pcpu_find(0)->pc_virq_to_irq[virq]) == -1)
 984                         continue;
 985
 986                 KASSERT(irq_info[irq] == mk_irq_info(IRQT_VIRQ, virq, 0),
 987                     ("irq_info inconsistent"));
 988
 989                 /* Get a new binding from Xen. */
 990                 bind_virq.virq = virq;
 991                 bind_virq.vcpu = 0;
 992                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, &bind_virq);
 993                 evtchn = bind_virq.port;
 994
 995                 /* Record the new mapping. */
 996                 evtchn_to_irq[evtchn] = irq;
 997                 irq_info[irq] = mk_irq_info(IRQT_VIRQ, virq, evtchn);
 998
 999                 /* Ready for use. */
1000                 unmask_evtchn(evtchn);
1001         }
1002
1003         /* Primary CPU: rebind IPIs automatically. */
1004         for (ipi = 0; ipi < NR_IPIS; ipi++) {
1005                 if ((irq = pcpu_find(0)->pc_ipi_to_irq[ipi]) == -1)
1006                         continue;
1007
1008                 KASSERT(irq_info[irq] == mk_irq_info(IRQT_IPI, ipi, 0),
1009                     ("irq_info inconsistent"));
1010
1011                 /* Get a new binding from Xen. */
1012                 memset(&op, 0, sizeof(op));
1013                 bind_ipi.vcpu = 0;
1014                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, &bind_ipi);
1015                 evtchn = bind_ipi.port;
1016
1017                 /* Record the new mapping. */
1018                 evtchn_to_irq[evtchn] = irq;
1019                 irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn);
1020
1021                 /* Ready for use. */
1022                 unmask_evtchn(evtchn);
1023         }
1024 }
1025
1026 static void
1027 evtchn_init(void *dummy __unused)
1028 {
1029         int i, cpu;
1030         struct xenpic_intsrc *pin, *tpin;
1031
1032
1033         init_evtchn_cpu_bindings();
1034
1035          /* No VIRQ or IPI bindings. */
1036         for (cpu = 0; cpu < mp_ncpus; cpu++) {
1037                 for (i = 0; i < NR_VIRQS; i++)
1038                         pcpu_find(cpu)->pc_virq_to_irq[i] = -1;
1039                 for (i = 0; i < NR_IPIS; i++)
1040                         pcpu_find(cpu)->pc_ipi_to_irq[i] = -1;
1041         }
1042
1043         /* No event-channel -> IRQ mappings. */
1044         for (i = 0; i < NR_EVENT_CHANNELS; i++) {
1045                 evtchn_to_irq[i] = -1;
1046                 mask_evtchn(i); /* No event channels are 'live' right now. */
1047         }
1048
1049         /* No IRQ -> event-channel mappings. */
1050         for (i = 0; i < NR_IRQS; i++)
1051                 irq_info[i] = IRQ_UNBOUND;
1052
1053         xp = malloc(sizeof(struct xenpic) + NR_IRQS*sizeof(struct xenpic_intsrc),
1054                     M_DEVBUF, M_WAITOK);
1055
1056         xp->xp_dynirq_pic = &xenpic_dynirq_template;
1057         xp->xp_pirq_pic = &xenpic_pirq_template;
1058         xp->xp_numintr = NR_IRQS;
1059         bzero(xp->xp_pins, sizeof(struct xenpic_intsrc) * NR_IRQS);
1060
1061
1062         /* We need to register our PIC's beforehand */
1063         if (intr_register_pic(&xenpic_pirq_template))
1064                 panic("XEN: intr_register_pic() failure");
1065         if (intr_register_pic(&xenpic_dynirq_template))
1066                 panic("XEN: intr_register_pic() failure");
1067
1068         /*
1069          * Initialize the dynamic IRQ's - we initialize the structures, but
1070          * we do not bind them (bind_evtchn_to_irqhandle() does this)
1071          */
1072         pin = xp->xp_pins;
1073         for (i = 0; i < NR_DYNIRQS; i++) {
1074                 /* Dynamic IRQ space is currently unbound. Zero the refcnts. */
1075                 irq_bindcount[dynirq_to_irq(i)] = 0;
1076
1077                 tpin = &pin[dynirq_to_irq(i)];
1078                 tpin->xp_intsrc.is_pic = xp->xp_dynirq_pic;
1079                 tpin->xp_vector = dynirq_to_irq(i);
1080
1081         }
1082         /*
1083          * Now, we go ahead and claim every PIRQ there is.
1084          */
1085         pin = xp->xp_pins;
1086         for (i = 0; i < NR_PIRQS; i++) {
1087                 /* Dynamic IRQ space is currently unbound. Zero the refcnts. */
1088                 irq_bindcount[pirq_to_irq(i)] = 0;
1089
1090 #ifdef RTC_IRQ
1091                 /* If not domain 0, force our RTC driver to fail its probe. */
1092                 if ((i == RTC_IRQ) &&
1093                     !(xen_start_info->flags & SIF_INITDOMAIN))
1094                         continue;
1095 #endif
1096                 tpin = &pin[pirq_to_irq(i)];
1097                 tpin->xp_intsrc.is_pic = xp->xp_pirq_pic;
1098                 tpin->xp_vector = pirq_to_irq(i);
1099
1100         }
1101 }
1102
1103 SYSINIT(evtchn_init, SI_SUB_INTR, SI_ORDER_MIDDLE, evtchn_init, NULL);
1104     /*
1105      * irq_mapping_update_lock: in order to allow an interrupt to occur in a critical
1106      *          section, to set pcpu->ipending (etc...) properly, we
1107      *          must be able to get the icu lock, so it can't be
1108      *          under witness.
1109      */
1110
1111 MTX_SYSINIT(irq_mapping_update_lock, &irq_mapping_update_lock, "xp", MTX_SPIN);