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, int * 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         *port = 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, int * 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         *port = 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, int * port)
 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, port);
 321 }
 322
 323 static int
 324 bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
 325     unsigned int remote_port, int * 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, port);
 337 }
 338
 339 static int
 340 bind_virq_to_irq(unsigned int virq, unsigned int cpu, int * port)
 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         *port = evtchn;
 367 out:
 368         mtx_unlock_spin(&irq_mapping_update_lock);
 369
 370         return irq;
 371 }
 372
 373
 374 static int
 375 bind_ipi_to_irq(unsigned int ipi, unsigned int cpu, int * port)
 376 {
 377         struct evtchn_bind_ipi bind_ipi;
 378         int irq;
 379         int evtchn = 0;
 380
 381         mtx_lock_spin(&irq_mapping_update_lock);
 382
 383         if ((irq = pcpu_find(cpu)->pc_ipi_to_irq[ipi]) == -1) {
 384                 if ((irq = find_unbound_irq()) < 0)
 385                         goto out;
 386
 387                 bind_ipi.vcpu = cpu;
 388                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, &bind_ipi);
 389                 evtchn = bind_ipi.port;
 390
 391                 evtchn_to_irq[evtchn] = irq;
 392                 irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn);
 393
 394                 pcpu_find(cpu)->pc_ipi_to_irq[ipi] = irq;
 395
 396                 bind_evtchn_to_cpu(evtchn, cpu);
 397         }
 398         irq_bindcount[irq]++;
 399         *port = evtchn;
 400 out:
 401
 402         mtx_unlock_spin(&irq_mapping_update_lock);
 403
 404         return irq;
 405 }
 406
 407
 408 static void
 409 unbind_from_irq(int irq)
 410 {
 411         struct evtchn_close close;
 412         int evtchn = evtchn_from_irq(irq);
 413         int cpu;
 414
 415         mtx_lock_spin(&irq_mapping_update_lock);
 416
 417         if ((--irq_bindcount[irq] == 0) && VALID_EVTCHN(evtchn)) {
 418                 close.port = evtchn;
 419                 HYPERVISOR_event_channel_op(EVTCHNOP_close, &close);
 420
 421                 switch (type_from_irq(irq)) {
 422                 case IRQT_VIRQ:
 423                         cpu = cpu_from_evtchn(evtchn);
 424                         pcpu_find(cpu)->pc_virq_to_irq[index_from_irq(irq)] = -1;
 425                         break;
 426                 case IRQT_IPI:
 427                         cpu = cpu_from_evtchn(evtchn);
 428                         pcpu_find(cpu)->pc_ipi_to_irq[index_from_irq(irq)] = -1;
 429                         break;
 430                 default:
 431                         break;
 432                 }
 433
 434                 /* Closed ports are implicitly re-bound to VCPU0. */
 435                 bind_evtchn_to_cpu(evtchn, 0);
 436
 437                 evtchn_to_irq[evtchn] = -1;
 438                 irq_info[irq] = IRQ_UNBOUND;
 439         }
 440
 441         mtx_unlock_spin(&irq_mapping_update_lock);
 442 }
 443
 444 int
 445 bind_caller_port_to_irqhandler(unsigned int caller_port,
 446     const char *devname, driver_intr_t handler, void *arg,
 447     unsigned long irqflags, unsigned int *irqp)
 448 {
 449         unsigned int irq;
 450         int port = -1;
 451         int error;
 452
 453         irq = bind_caller_port_to_irq(caller_port, &port);
 454         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 455         error = intr_add_handler(devname, irq, NULL, handler, arg, irqflags,
 456             &xp->xp_pins[irq].xp_cookie);
 457
 458         if (error) {
 459                 unbind_from_irq(irq);
 460                 return (error);
 461         }
 462         if (port != -1)
 463                 unmask_evtchn(port);
 464
 465         if (irqp)
 466                 *irqp = irq;
 467
 468         return (0);
 469 }
 470
 471 int
 472 bind_listening_port_to_irqhandler(unsigned int remote_domain,
 473     const char *devname, driver_intr_t handler, void *arg,
 474     unsigned long irqflags, unsigned int *irqp)
 475 {
 476         unsigned int irq;
 477         int port = -1;
 478         int error;
 479
 480         irq = bind_listening_port_to_irq(remote_domain, &port);
 481         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 482         error = intr_add_handler(devname, irq, NULL, handler, arg, irqflags,
 483             &xp->xp_pins[irq].xp_cookie);
 484         if (error) {
 485                 unbind_from_irq(irq);
 486                 return (error);
 487         }
 488         if (port != -1)
 489                 unmask_evtchn(port);
 490         if (irqp)
 491                 *irqp = irq;
 492
 493         return (0);
 494 }
 495
 496 int
 497 bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
 498     unsigned int remote_port, const char *devname,
 499     driver_intr_t handler, void *arg, unsigned long irqflags,
 500     unsigned int *irqp)
 501 {
 502         unsigned int irq;
 503         int port = -1;
 504         int error;
 505
 506         irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port, &port);
 507         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 508         error = intr_add_handler(devname, irq, NULL, handler, arg,
 509             irqflags, &xp->xp_pins[irq].xp_cookie);
 510         if (error) {
 511                 unbind_from_irq(irq);
 512                 return (error);
 513         }
 514         if (port != -1)
 515                 unmask_evtchn(port);
 516
 517         if (irqp)
 518                 *irqp = irq;
 519         return (0);
 520 }
 521
 522 int
 523 bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
 524     const char *devname, driver_filter_t filter, driver_intr_t handler,
 525     void *arg, unsigned long irqflags, unsigned int *irqp)
 526 {
 527         unsigned int irq;
 528         int port = -1;
 529         int error;
 530
 531         irq = bind_virq_to_irq(virq, cpu, &port);
 532         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 533         error = intr_add_handler(devname, irq, filter, handler,
 534             arg, irqflags, &xp->xp_pins[irq].xp_cookie);
 535         if (error) {
 536                 unbind_from_irq(irq);
 537                 return (error);
 538         }
 539         if (port != -1)
 540                 unmask_evtchn(port);
 541
 542         if (irqp)
 543                 *irqp = irq;
 544         return (0);
 545 }
 546
 547 int
 548 bind_ipi_to_irqhandler(unsigned int ipi, unsigned int cpu,
 549     const char *devname, driver_filter_t filter,
 550     unsigned long irqflags, unsigned int *irqp)
 551 {
 552         unsigned int irq;
 553         int port = -1;
 554         int error;
 555
 556         irq = bind_ipi_to_irq(ipi, cpu, &port);
 557         intr_register_source(&xp->xp_pins[irq].xp_intsrc);
 558         error = intr_add_handler(devname, irq, filter, NULL,
 559             NULL, irqflags, &xp->xp_pins[irq].xp_cookie);
 560         if (error) {
 561                 unbind_from_irq(irq);
 562                 return (error);
 563         }
 564         if (port != -1)
 565                 unmask_evtchn(port);
 566
 567         if (irqp)
 568                 *irqp = irq;
 569         return (0);
 570 }
 571
 572 void
 573 unbind_from_irqhandler(unsigned int irq)
 574 {
 575         intr_remove_handler(xp->xp_pins[irq].xp_cookie);
 576         unbind_from_irq(irq);
 577 }
 578
 579 #if 0
 580 /* Rebind an evtchn so that it gets delivered to a specific cpu */
 581 static void
 582 rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
 583 {
 584         evtchn_op_t op = { .cmd = EVTCHNOP_bind_vcpu };
 585         int evtchn;
 586
 587         mtx_lock_spin(&irq_mapping_update_lock);
 588
 589         evtchn = evtchn_from_irq(irq);
 590         if (!VALID_EVTCHN(evtchn)) {
 591                 mtx_unlock_spin(&irq_mapping_update_lock);
 592                 return;
 593         }
 594
 595         /* Send future instances of this interrupt to other vcpu. */
 596         bind_vcpu.port = evtchn;
 597         bind_vcpu.vcpu = tcpu;
 598
 599         /*
 600          * If this fails, it usually just indicates that we're dealing with a
 601          * virq or IPI channel, which don't actually need to be rebound. Ignore
 602          * it, but don't do the xenlinux-level rebind in that case.
 603          */
 604         if (HYPERVISOR_event_channel_op(&op) >= 0)
 605                 bind_evtchn_to_cpu(evtchn, tcpu);
 606
 607         mtx_unlock_spin(&irq_mapping_update_lock);
 608
 609 }
 610
 611 static void set_affinity_irq(unsigned irq, cpumask_t dest)
 612 {
 613         unsigned tcpu = ffs(dest) - 1;
 614         rebind_irq_to_cpu(irq, tcpu);
 615 }
 616 #endif
 617
 618 /*
 619  * Interface to generic handling in intr_machdep.c
 620  */
 621
 622
 623 /*------------ interrupt handling --------------------------------------*/
 624 #define TODO            printf("%s: not implemented!\n", __func__)
 625
 626
 627 static void     xenpic_dynirq_enable_source(struct intsrc *isrc);
 628 static void     xenpic_dynirq_disable_source(struct intsrc *isrc, int);
 629 static void     xenpic_dynirq_eoi_source(struct intsrc *isrc);
 630 static void     xenpic_dynirq_enable_intr(struct intsrc *isrc);
 631
 632 static void     xenpic_pirq_enable_source(struct intsrc *isrc);
 633 static void     xenpic_pirq_disable_source(struct intsrc *isrc, int);
 634 static void     xenpic_pirq_eoi_source(struct intsrc *isrc);
 635 static void     xenpic_pirq_enable_intr(struct intsrc *isrc);
 636
 637
 638 static int      xenpic_vector(struct intsrc *isrc);
 639 static int      xenpic_source_pending(struct intsrc *isrc);
 640 static void     xenpic_suspend(struct pic* pic);
 641 static void     xenpic_resume(struct pic* pic);
 642 static int      xenpic_assign_cpu(struct intsrc *, u_int apic_id);
 643
 644
 645 struct pic xenpic_dynirq_template  =  {
 646         .pic_enable_source      =       xenpic_dynirq_enable_source,
 647         .pic_disable_source     =       xenpic_dynirq_disable_source,
 648         .pic_eoi_source         =       xenpic_dynirq_eoi_source,
 649         .pic_enable_intr        =       xenpic_dynirq_enable_intr,
 650         .pic_vector             =       xenpic_vector,
 651         .pic_source_pending     =       xenpic_source_pending,
 652         .pic_suspend            =       xenpic_suspend,
 653         .pic_resume             =       xenpic_resume
 654 };
 655
 656 struct pic xenpic_pirq_template  =  {
 657         .pic_enable_source      =       xenpic_pirq_enable_source,
 658         .pic_disable_source     =       xenpic_pirq_disable_source,
 659         .pic_eoi_source         =       xenpic_pirq_eoi_source,
 660         .pic_enable_intr        =       xenpic_pirq_enable_intr,
 661         .pic_vector             =       xenpic_vector,
 662         .pic_source_pending     =       xenpic_source_pending,
 663         .pic_suspend            =       xenpic_suspend,
 664         .pic_resume             =       xenpic_resume,
 665         .pic_assign_cpu         =       xenpic_assign_cpu
 666 };
 667
 668
 669
 670 void
 671 xenpic_dynirq_enable_source(struct intsrc *isrc)
 672 {
 673         unsigned int irq;
 674         struct xenpic_intsrc *xp;
 675
 676         xp = (struct xenpic_intsrc *)isrc;
 677
 678         mtx_lock_spin(&irq_mapping_update_lock);
 679         if (xp->xp_masked) {
 680                 irq = xenpic_vector(isrc);
 681                 unmask_evtchn(evtchn_from_irq(irq));
 682                 xp->xp_masked = FALSE;
 683         }
 684         mtx_unlock_spin(&irq_mapping_update_lock);
 685 }
 686
 687 static void
 688 xenpic_dynirq_disable_source(struct intsrc *isrc, int foo)
 689 {
 690         unsigned int irq;
 691         struct xenpic_intsrc *xp;
 692
 693         xp = (struct xenpic_intsrc *)isrc;
 694
 695         mtx_lock_spin(&irq_mapping_update_lock);
 696         if (!xp->xp_masked) {
 697                 irq = xenpic_vector(isrc);
 698                 mask_evtchn(evtchn_from_irq(irq));
 699                 xp->xp_masked = TRUE;
 700         }
 701         mtx_unlock_spin(&irq_mapping_update_lock);
 702 }
 703
 704 static void
 705 xenpic_dynirq_enable_intr(struct intsrc *isrc)
 706 {
 707         unsigned int irq;
 708         struct xenpic_intsrc *xp;
 709
 710         xp = (struct xenpic_intsrc *)isrc;
 711         mtx_lock_spin(&irq_mapping_update_lock);
 712         xp->xp_masked = 0;
 713         irq = xenpic_vector(isrc);
 714         unmask_evtchn(evtchn_from_irq(irq));
 715         mtx_unlock_spin(&irq_mapping_update_lock);
 716 }
 717
 718 static void
 719 xenpic_dynirq_eoi_source(struct intsrc *isrc)
 720 {
 721         unsigned int irq;
 722         struct xenpic_intsrc *xp;
 723
 724         xp = (struct xenpic_intsrc *)isrc;
 725         mtx_lock_spin(&irq_mapping_update_lock);
 726         xp->xp_masked = 0;
 727         irq = xenpic_vector(isrc);
 728         unmask_evtchn(evtchn_from_irq(irq));
 729         mtx_unlock_spin(&irq_mapping_update_lock);
 730 }
 731
 732 static int
 733 xenpic_vector(struct intsrc *isrc)
 734 {
 735     struct xenpic_intsrc *pin;
 736
 737     pin = (struct xenpic_intsrc *)isrc;
 738    //printf("xenpic_vector(): isrc=%p,vector=%u\n", pin, pin->xp_vector);
 739
 740     return (pin->xp_vector);
 741 }
 742
 743 static int
 744 xenpic_source_pending(struct intsrc *isrc)
 745 {
 746     struct xenpic_intsrc *pin = (struct xenpic_intsrc *)isrc;
 747
 748         /* XXXEN: TODO */
 749         printf("xenpic_source_pending(): vector=%x,masked=%x\n",
 750             pin->xp_vector, pin->xp_masked);
 751
 752 /*      notify_remote_via_evtchn(pin->xp_vector); // XXX RS: Is this correct? */
 753         return 0;
 754 }
 755
 756 static void
 757 xenpic_suspend(struct pic* pic)
 758 {
 759         TODO;
 760 }
 761
 762 static void
 763 xenpic_resume(struct pic* pic)
 764 {
 765         TODO;
 766 }
 767
 768 static int
 769 xenpic_assign_cpu(struct intsrc *isrc, u_int apic_id)
 770 {
 771         TODO;
 772         return (EOPNOTSUPP);
 773 }
 774
 775 void
 776 notify_remote_via_irq(int irq)
 777 {
 778         int evtchn = evtchn_from_irq(irq);
 779
 780         if (VALID_EVTCHN(evtchn))
 781                 notify_remote_via_evtchn(evtchn);
 782         else
 783                 panic("invalid evtchn %d", irq);
 784 }
 785
 786 /* required for support of physical devices */
 787 static inline void
 788 pirq_unmask_notify(int pirq)
 789 {
 790         struct physdev_eoi eoi = { .irq = pirq };
 791
 792         if (unlikely(test_bit(pirq, &pirq_needs_unmask_notify[0]))) {
 793                 (void)HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
 794         }
 795 }
 796
 797 static inline void
 798 pirq_query_unmask(int pirq)
 799 {
 800         struct physdev_irq_status_query irq_status_query;
 801
 802         irq_status_query.irq = pirq;
 803         (void)HYPERVISOR_physdev_op(PHYSDEVOP_IRQ_STATUS_QUERY, &irq_status_query);
 804         clear_bit(pirq, &pirq_needs_unmask_notify[0]);
 805         if ( irq_status_query.flags & PHYSDEVOP_IRQ_NEEDS_UNMASK_NOTIFY )
 806                 set_bit(pirq, &pirq_needs_unmask_notify[0]);
 807 }
 808
 809 /*
 810  * On startup, if there is no action associated with the IRQ then we are
 811  * probing. In this case we should not share with others as it will confuse us.
 812  */
 813 #define probing_irq(_irq) (intr_lookup_source(irq) == NULL)
 814
 815 static void
 816 xenpic_pirq_enable_intr(struct intsrc *isrc)
 817 {
 818         struct evtchn_bind_pirq bind_pirq;
 819         int evtchn;
 820         unsigned int irq;
 821
 822         mtx_lock_spin(&irq_mapping_update_lock);
 823         irq = xenpic_vector(isrc);
 824         evtchn = evtchn_from_irq(irq);
 825
 826         if (VALID_EVTCHN(evtchn))
 827                 goto out;
 828
 829         bind_pirq.pirq  = irq;
 830         /* NB. We are happy to share unless we are probing. */
 831         bind_pirq.flags = probing_irq(irq) ? 0 : BIND_PIRQ__WILL_SHARE;
 832
 833         if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq) != 0) {
 834 #ifndef XEN_PRIVILEGED_GUEST
 835                 panic("unexpected pirq call");
 836 #endif
 837                 if (!probing_irq(irq)) /* Some failures are expected when probing. */
 838                         printf("Failed to obtain physical IRQ %d\n", irq);
 839                 mtx_unlock_spin(&irq_mapping_update_lock);
 840                 return;
 841         }
 842         evtchn = bind_pirq.port;
 843
 844         pirq_query_unmask(irq_to_pirq(irq));
 845
 846         bind_evtchn_to_cpu(evtchn, 0);
 847         evtchn_to_irq[evtchn] = irq;
 848         irq_info[irq] = mk_irq_info(IRQT_PIRQ, irq, evtchn);
 849
 850  out:
 851         unmask_evtchn(evtchn);
 852         pirq_unmask_notify(irq_to_pirq(irq));
 853         mtx_unlock_spin(&irq_mapping_update_lock);
 854 }
 855
 856 static void
 857 xenpic_pirq_enable_source(struct intsrc *isrc)
 858 {
 859         int evtchn;
 860         unsigned int irq;
 861
 862         mtx_lock_spin(&irq_mapping_update_lock);
 863         irq = xenpic_vector(isrc);
 864         evtchn = evtchn_from_irq(irq);
 865
 866         if (!VALID_EVTCHN(evtchn))
 867                 goto done;
 868
 869         unmask_evtchn(evtchn);
 870         pirq_unmask_notify(irq_to_pirq(irq));
 871  done:
 872         mtx_unlock_spin(&irq_mapping_update_lock);
 873 }
 874
 875 static void
 876 xenpic_pirq_disable_source(struct intsrc *isrc, int eoi)
 877 {
 878         int evtchn;
 879         unsigned int irq;
 880
 881         mtx_lock_spin(&irq_mapping_update_lock);
 882         irq = xenpic_vector(isrc);
 883         evtchn = evtchn_from_irq(irq);
 884
 885         if (!VALID_EVTCHN(evtchn))
 886                 goto done;
 887
 888         mask_evtchn(evtchn);
 889  done:
 890         mtx_unlock_spin(&irq_mapping_update_lock);
 891 }
 892
 893
 894 static void
 895 xenpic_pirq_eoi_source(struct intsrc *isrc)
 896 {
 897         int evtchn;
 898         unsigned int irq;
 899
 900         mtx_lock_spin(&irq_mapping_update_lock);
 901         irq = xenpic_vector(isrc);
 902         evtchn = evtchn_from_irq(irq);
 903
 904         if (!VALID_EVTCHN(evtchn))
 905                 goto done;
 906
 907         unmask_evtchn(evtchn);
 908         pirq_unmask_notify(irq_to_pirq(irq));
 909  done:
 910         mtx_unlock_spin(&irq_mapping_update_lock);
 911 }
 912
 913 int
 914 irq_to_evtchn_port(int irq)
 915 {
 916         return evtchn_from_irq(irq);
 917 }
 918
 919 void
 920 mask_evtchn(int port)
 921 {
 922         shared_info_t *s = HYPERVISOR_shared_info;
 923         synch_set_bit(port, &s->evtchn_mask[0]);
 924 }
 925
 926 void
 927 unmask_evtchn(int port)
 928 {
 929         shared_info_t *s = HYPERVISOR_shared_info;
 930         unsigned int cpu = PCPU_GET(cpuid);
 931         vcpu_info_t *vcpu_info = &s->vcpu_info[cpu];
 932
 933         /* Slow path (hypercall) if this is a non-local port. */
 934         if (unlikely(cpu != cpu_from_evtchn(port))) {
 935                 struct evtchn_unmask unmask = { .port = port };
 936                 (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
 937                 return;
 938         }
 939
 940         synch_clear_bit(port, &s->evtchn_mask);
 941
 942         /*
 943          * The following is basically the equivalent of 'hw_resend_irq'. Just
 944          * like a real IO-APIC we 'lose the interrupt edge' if the channel is
 945          * masked.
 946          */
 947         if (synch_test_bit(port, &s->evtchn_pending) &&
 948             !synch_test_and_set_bit(port / LONG_BIT,
 949                                     &vcpu_info->evtchn_pending_sel)) {
 950                 vcpu_info->evtchn_upcall_pending = 1;
 951                 if (!vcpu_info->evtchn_upcall_mask)
 952                         force_evtchn_callback();
 953         }
 954 }
 955
 956 void irq_resume(void)
 957 {
 958         evtchn_op_t op;
 959         int         cpu, pirq, virq, ipi, irq, evtchn;
 960
 961         struct evtchn_bind_virq bind_virq;
 962         struct evtchn_bind_ipi bind_ipi;
 963
 964         init_evtchn_cpu_bindings();
 965
 966         /* New event-channel space is not 'live' yet. */
 967         for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
 968                 mask_evtchn(evtchn);
 969
 970         /* Check that no PIRQs are still bound. */
 971         for (pirq = 0; pirq < NR_PIRQS; pirq++) {
 972                 KASSERT(irq_info[pirq_to_irq(pirq)] == IRQ_UNBOUND,
 973                     ("pirq_to_irq inconsistent"));
 974         }
 975
 976         /* Secondary CPUs must have no VIRQ or IPI bindings. */
 977         for (cpu = 1; cpu < MAX_VIRT_CPUS; cpu++) {
 978                 for (virq = 0; virq < NR_VIRQS; virq++) {
 979                         KASSERT(pcpu_find(cpu)->pc_virq_to_irq[virq] == -1,
 980                             ("virq_to_irq inconsistent"));
 981                 }
 982                 for (ipi = 0; ipi < NR_IPIS; ipi++) {
 983                         KASSERT(pcpu_find(cpu)->pc_ipi_to_irq[ipi] == -1,
 984                             ("ipi_to_irq inconsistent"));
 985                 }
 986         }
 987
 988         /* No IRQ <-> event-channel mappings. */
 989         for (irq = 0; irq < NR_IRQS; irq++)
 990                 irq_info[irq] &= ~0xFFFF; /* zap event-channel binding */
 991         for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
 992                 evtchn_to_irq[evtchn] = -1;
 993
 994         /* Primary CPU: rebind VIRQs automatically. */
 995         for (virq = 0; virq < NR_VIRQS; virq++) {
 996                 if ((irq = pcpu_find(0)->pc_virq_to_irq[virq]) == -1)
 997                         continue;
 998
 999                 KASSERT(irq_info[irq] == mk_irq_info(IRQT_VIRQ, virq, 0),
1000                     ("irq_info inconsistent"));
1001
1002                 /* Get a new binding from Xen. */
1003                 bind_virq.virq = virq;
1004                 bind_virq.vcpu = 0;
1005                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, &bind_virq);
1006                 evtchn = bind_virq.port;
1007
1008                 /* Record the new mapping. */
1009                 evtchn_to_irq[evtchn] = irq;
1010                 irq_info[irq] = mk_irq_info(IRQT_VIRQ, virq, evtchn);
1011
1012                 /* Ready for use. */
1013                 unmask_evtchn(evtchn);
1014         }
1015
1016         /* Primary CPU: rebind IPIs automatically. */
1017         for (ipi = 0; ipi < NR_IPIS; ipi++) {
1018                 if ((irq = pcpu_find(0)->pc_ipi_to_irq[ipi]) == -1)
1019                         continue;
1020
1021                 KASSERT(irq_info[irq] == mk_irq_info(IRQT_IPI, ipi, 0),
1022                     ("irq_info inconsistent"));
1023
1024                 /* Get a new binding from Xen. */
1025                 memset(&op, 0, sizeof(op));
1026                 bind_ipi.vcpu = 0;
1027                 HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, &bind_ipi);
1028                 evtchn = bind_ipi.port;
1029
1030                 /* Record the new mapping. */
1031                 evtchn_to_irq[evtchn] = irq;
1032                 irq_info[irq] = mk_irq_info(IRQT_IPI, ipi, evtchn);
1033
1034                 /* Ready for use. */
1035                 unmask_evtchn(evtchn);
1036         }
1037 }
1038
1039 static void
1040 evtchn_init(void *dummy __unused)
1041 {
1042         int i, cpu;
1043         struct xenpic_intsrc *pin, *tpin;
1044
1045
1046         init_evtchn_cpu_bindings();
1047
1048          /* No VIRQ or IPI bindings. */
1049         for (cpu = 0; cpu < mp_ncpus; cpu++) {
1050                 for (i = 0; i < NR_VIRQS; i++)
1051                         pcpu_find(cpu)->pc_virq_to_irq[i] = -1;
1052                 for (i = 0; i < NR_IPIS; i++)
1053                         pcpu_find(cpu)->pc_ipi_to_irq[i] = -1;
1054         }
1055
1056         /* No event-channel -> IRQ mappings. */
1057         for (i = 0; i < NR_EVENT_CHANNELS; i++) {
1058                 evtchn_to_irq[i] = -1;
1059                 mask_evtchn(i); /* No event channels are 'live' right now. */
1060         }
1061
1062         /* No IRQ -> event-channel mappings. */
1063         for (i = 0; i < NR_IRQS; i++)
1064                 irq_info[i] = IRQ_UNBOUND;
1065
1066         xp = malloc(sizeof(struct xenpic) + NR_IRQS*sizeof(struct xenpic_intsrc),
1067                     M_DEVBUF, M_WAITOK);
1068
1069         xp->xp_dynirq_pic = &xenpic_dynirq_template;
1070         xp->xp_pirq_pic = &xenpic_pirq_template;
1071         xp->xp_numintr = NR_IRQS;
1072         bzero(xp->xp_pins, sizeof(struct xenpic_intsrc) * NR_IRQS);
1073
1074
1075         /* We need to register our PIC's beforehand */
1076         if (intr_register_pic(&xenpic_pirq_template))
1077                 panic("XEN: intr_register_pic() failure");
1078         if (intr_register_pic(&xenpic_dynirq_template))
1079                 panic("XEN: intr_register_pic() failure");
1080
1081         /*
1082          * Initialize the dynamic IRQ's - we initialize the structures, but
1083          * we do not bind them (bind_evtchn_to_irqhandle() does this)
1084          */
1085         pin = xp->xp_pins;
1086         for (i = 0; i < NR_DYNIRQS; i++) {
1087                 /* Dynamic IRQ space is currently unbound. Zero the refcnts. */
1088                 irq_bindcount[dynirq_to_irq(i)] = 0;
1089
1090                 tpin = &pin[dynirq_to_irq(i)];
1091                 tpin->xp_intsrc.is_pic = xp->xp_dynirq_pic;
1092                 tpin->xp_vector = dynirq_to_irq(i);
1093
1094         }
1095         /*
1096          * Now, we go ahead and claim every PIRQ there is.
1097          */
1098         pin = xp->xp_pins;
1099         for (i = 0; i < NR_PIRQS; i++) {
1100                 /* Dynamic IRQ space is currently unbound. Zero the refcnts. */
1101                 irq_bindcount[pirq_to_irq(i)] = 0;
1102
1103 #ifdef RTC_IRQ
1104                 /* If not domain 0, force our RTC driver to fail its probe. */
1105                 if ((i == RTC_IRQ) &&
1106                     !(xen_start_info->flags & SIF_INITDOMAIN))
1107                         continue;
1108 #endif
1109                 tpin = &pin[pirq_to_irq(i)];
1110                 tpin->xp_intsrc.is_pic = xp->xp_pirq_pic;
1111                 tpin->xp_vector = pirq_to_irq(i);
1112
1113         }
1114 }
1115
1116 SYSINIT(evtchn_init, SI_SUB_INTR, SI_ORDER_MIDDLE, evtchn_init, NULL);
1117     /*
1118      * irq_mapping_update_lock: in order to allow an interrupt to occur in a critical
1119      *          section, to set pcpu->ipending (etc...) properly, we
1120      *          must be able to get the icu lock, so it can't be
1121      *          under witness.
1122      */
1123
1124 MTX_SYSINIT(irq_mapping_update_lock, &irq_mapping_update_lock, "xp", MTX_SPIN);