sys/x86/xen/xen_apic.c

   1 /*
   2  * Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/bus.h>
  32 #include <sys/kernel.h>
  33 #include <sys/malloc.h>
  34 #include <sys/proc.h>
  35 #include <sys/smp.h>
  36 #include <sys/systm.h>
  37
  38 #include <vm/vm.h>
  39 #include <vm/pmap.h>
  40
  41 #include <machine/cpufunc.h>
  42 #include <machine/cpu.h>
  43 #include <machine/intr_machdep.h>
  44 #include <machine/smp.h>
  45
  46 #include <x86/apicreg.h>
  47 #include <x86/apicvar.h>
  48
  49 #include <xen/xen-os.h>
  50 #include <xen/features.h>
  51 #include <xen/gnttab.h>
  52 #include <xen/hypervisor.h>
  53 #include <xen/hvm.h>
  54 #include <xen/xen_intr.h>
  55
  56 #include <xen/interface/vcpu.h>
  57
  58 /*--------------------------------- Macros -----------------------------------*/
  59
  60 #define XEN_APIC_UNSUPPORTED \
  61         panic("%s: not available in Xen PV port.", __func__)
  62
  63
  64 /*--------------------------- Forward Declarations ---------------------------*/
  65 #ifdef SMP
  66 static driver_filter_t xen_smp_rendezvous_action;
  67 static driver_filter_t xen_invltlb;
  68 static driver_filter_t xen_invlpg;
  69 static driver_filter_t xen_invlrng;
  70 static driver_filter_t xen_invlcache;
  71 #ifdef __i386__
  72 static driver_filter_t xen_lazypmap;
  73 #endif
  74 static driver_filter_t xen_ipi_bitmap_handler;
  75 static driver_filter_t xen_cpustop_handler;
  76 static driver_filter_t xen_cpususpend_handler;
  77 static driver_filter_t xen_cpustophard_handler;
  78 #endif
  79
  80 /*---------------------------- Extern Declarations ---------------------------*/
  81 /* Variables used by mp_machdep to perform the MMU related IPIs */
  82 #ifdef __i386__
  83 extern void pmap_lazyfix_action(void);
  84 #endif
  85 #ifdef __amd64__
  86 extern int pmap_pcid_enabled;
  87 #endif
  88
  89 /*---------------------------------- Macros ----------------------------------*/
  90 #define IPI_TO_IDX(ipi) ((ipi) - APIC_IPI_INTS)
  91
  92 /*--------------------------------- Xen IPIs ---------------------------------*/
  93 #ifdef SMP
  94 struct xen_ipi_handler
  95 {
  96         driver_filter_t *filter;
  97         const char      *description;
  98 };
  99
 100 static struct xen_ipi_handler xen_ipis[] =
 101 {
 102         [IPI_TO_IDX(IPI_RENDEZVOUS)]    = { xen_smp_rendezvous_action,  "r"   },
 103         [IPI_TO_IDX(IPI_INVLTLB)]       = { xen_invltlb,                "itlb"},
 104         [IPI_TO_IDX(IPI_INVLPG)]        = { xen_invlpg,                 "ipg" },
 105         [IPI_TO_IDX(IPI_INVLRNG)]       = { xen_invlrng,                "irg" },
 106         [IPI_TO_IDX(IPI_INVLCACHE)]     = { xen_invlcache,              "ic"  },
 107 #ifdef __i386__
 108         [IPI_TO_IDX(IPI_LAZYPMAP)]      = { xen_lazypmap,               "lp"  },
 109 #endif
 110         [IPI_TO_IDX(IPI_BITMAP_VECTOR)] = { xen_ipi_bitmap_handler,     "b"   },
 111         [IPI_TO_IDX(IPI_STOP)]          = { xen_cpustop_handler,        "st"  },
 112         [IPI_TO_IDX(IPI_SUSPEND)]       = { xen_cpususpend_handler,     "sp"  },
 113         [IPI_TO_IDX(IPI_STOP_HARD)]     = { xen_cpustophard_handler,    "sth" },
 114 };
 115 #endif
 116
 117 /*------------------------------- Per-CPU Data -------------------------------*/
 118 #ifdef SMP
 119 DPCPU_DEFINE(xen_intr_handle_t, ipi_handle[nitems(xen_ipis)]);
 120 #endif
 121
 122 /*------------------------------- Xen PV APIC --------------------------------*/
 123
 124 static void
 125 xen_pv_lapic_create(u_int apic_id, int boot_cpu)
 126 {
 127 #ifdef SMP
 128         cpu_add(apic_id, boot_cpu);
 129 #endif
 130 }
 131
 132 static void
 133 xen_pv_lapic_init(vm_paddr_t addr)
 134 {
 135
 136 }
 137
 138 static void
 139 xen_pv_lapic_setup(int boot)
 140 {
 141
 142 }
 143
 144 static void
 145 xen_pv_lapic_dump(const char *str)
 146 {
 147
 148         printf("cpu%d %s XEN PV LAPIC\n", PCPU_GET(cpuid), str);
 149 }
 150
 151 static void
 152 xen_pv_lapic_disable(void)
 153 {
 154
 155 }
 156
 157 static void
 158 xen_pv_lapic_eoi(void)
 159 {
 160
 161         XEN_APIC_UNSUPPORTED;
 162 }
 163
 164 static int
 165 xen_pv_lapic_id(void)
 166 {
 167
 168         return (PCPU_GET(apic_id));
 169 }
 170
 171 static int
 172 xen_pv_lapic_intr_pending(u_int vector)
 173 {
 174
 175         XEN_APIC_UNSUPPORTED;
 176         return (0);
 177 }
 178
 179 static u_int
 180 xen_pv_apic_cpuid(u_int apic_id)
 181 {
 182 #ifdef SMP
 183         return (apic_cpuids[apic_id]);
 184 #else
 185         return (0);
 186 #endif
 187 }
 188
 189 static u_int
 190 xen_pv_apic_alloc_vector(u_int apic_id, u_int irq)
 191 {
 192
 193         XEN_APIC_UNSUPPORTED;
 194         return (0);
 195 }
 196
 197 static u_int
 198 xen_pv_apic_alloc_vectors(u_int apic_id, u_int *irqs, u_int count, u_int align)
 199 {
 200
 201         XEN_APIC_UNSUPPORTED;
 202         return (0);
 203 }
 204
 205 static void
 206 xen_pv_apic_disable_vector(u_int apic_id, u_int vector)
 207 {
 208
 209         XEN_APIC_UNSUPPORTED;
 210 }
 211
 212 static void
 213 xen_pv_apic_enable_vector(u_int apic_id, u_int vector)
 214 {
 215
 216         XEN_APIC_UNSUPPORTED;
 217 }
 218
 219 static void
 220 xen_pv_apic_free_vector(u_int apic_id, u_int vector, u_int irq)
 221 {
 222
 223         XEN_APIC_UNSUPPORTED;
 224 }
 225
 226 static void
 227 xen_pv_lapic_set_logical_id(u_int apic_id, u_int cluster, u_int cluster_id)
 228 {
 229
 230         XEN_APIC_UNSUPPORTED;
 231 }
 232
 233 static int
 234 xen_pv_lapic_enable_pmc(void)
 235 {
 236
 237         XEN_APIC_UNSUPPORTED;
 238         return (0);
 239 }
 240
 241 static void
 242 xen_pv_lapic_disable_pmc(void)
 243 {
 244
 245         XEN_APIC_UNSUPPORTED;
 246 }
 247
 248 static void
 249 xen_pv_lapic_reenable_pmc(void)
 250 {
 251
 252         XEN_APIC_UNSUPPORTED;
 253 }
 254
 255 static void
 256 xen_pv_lapic_enable_cmc(void)
 257 {
 258
 259 }
 260
 261 #ifdef SMP
 262 static void
 263 xen_pv_lapic_ipi_raw(register_t icrlo, u_int dest)
 264 {
 265
 266         XEN_APIC_UNSUPPORTED;
 267 }
 268
 269 static void
 270 xen_pv_lapic_ipi_vectored(u_int vector, int dest)
 271 {
 272         xen_intr_handle_t *ipi_handle;
 273         int ipi_idx, to_cpu, self;
 274
 275         ipi_idx = IPI_TO_IDX(vector);
 276         if (ipi_idx >= nitems(xen_ipis))
 277                 panic("IPI out of range");
 278
 279         switch(dest) {
 280         case APIC_IPI_DEST_SELF:
 281                 ipi_handle = DPCPU_GET(ipi_handle);
 282                 xen_intr_signal(ipi_handle[ipi_idx]);
 283                 break;
 284         case APIC_IPI_DEST_ALL:
 285                 CPU_FOREACH(to_cpu) {
 286                         ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
 287                         xen_intr_signal(ipi_handle[ipi_idx]);
 288                 }
 289                 break;
 290         case APIC_IPI_DEST_OTHERS:
 291                 self = PCPU_GET(cpuid);
 292                 CPU_FOREACH(to_cpu) {
 293                         if (to_cpu != self) {
 294                                 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
 295                                 xen_intr_signal(ipi_handle[ipi_idx]);
 296                         }
 297                 }
 298                 break;
 299         default:
 300                 to_cpu = apic_cpuid(dest);
 301                 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
 302                 xen_intr_signal(ipi_handle[ipi_idx]);
 303                 break;
 304         }
 305 }
 306
 307 static int
 308 xen_pv_lapic_ipi_wait(int delay)
 309 {
 310
 311         XEN_APIC_UNSUPPORTED;
 312         return (0);
 313 }
 314 #endif
 315
 316 static int
 317 xen_pv_lapic_set_lvt_mask(u_int apic_id, u_int lvt, u_char masked)
 318 {
 319
 320         XEN_APIC_UNSUPPORTED;
 321         return (0);
 322 }
 323
 324 static int
 325 xen_pv_lapic_set_lvt_mode(u_int apic_id, u_int lvt, uint32_t mode)
 326 {
 327
 328         XEN_APIC_UNSUPPORTED;
 329         return (0);
 330 }
 331
 332 static int
 333 xen_pv_lapic_set_lvt_polarity(u_int apic_id, u_int lvt, enum intr_polarity pol)
 334 {
 335
 336         XEN_APIC_UNSUPPORTED;
 337         return (0);
 338 }
 339
 340 static int
 341 xen_pv_lapic_set_lvt_triggermode(u_int apic_id, u_int lvt,
 342     enum intr_trigger trigger)
 343 {
 344
 345         XEN_APIC_UNSUPPORTED;
 346         return (0);
 347 }
 348
 349 /* Xen apic_ops implementation */
 350 struct apic_ops xen_apic_ops = {
 351         .create                 = xen_pv_lapic_create,
 352         .init                   = xen_pv_lapic_init,
 353         .setup                  = xen_pv_lapic_setup,
 354         .dump                   = xen_pv_lapic_dump,
 355         .disable                = xen_pv_lapic_disable,
 356         .eoi                    = xen_pv_lapic_eoi,
 357         .id                     = xen_pv_lapic_id,
 358         .intr_pending           = xen_pv_lapic_intr_pending,
 359         .set_logical_id         = xen_pv_lapic_set_logical_id,
 360         .cpuid                  = xen_pv_apic_cpuid,
 361         .alloc_vector           = xen_pv_apic_alloc_vector,
 362         .alloc_vectors          = xen_pv_apic_alloc_vectors,
 363         .enable_vector          = xen_pv_apic_enable_vector,
 364         .disable_vector         = xen_pv_apic_disable_vector,
 365         .free_vector            = xen_pv_apic_free_vector,
 366         .enable_pmc             = xen_pv_lapic_enable_pmc,
 367         .disable_pmc            = xen_pv_lapic_disable_pmc,
 368         .reenable_pmc           = xen_pv_lapic_reenable_pmc,
 369         .enable_cmc             = xen_pv_lapic_enable_cmc,
 370 #ifdef SMP
 371         .ipi_raw                = xen_pv_lapic_ipi_raw,
 372         .ipi_vectored           = xen_pv_lapic_ipi_vectored,
 373         .ipi_wait               = xen_pv_lapic_ipi_wait,
 374 #endif
 375         .set_lvt_mask           = xen_pv_lapic_set_lvt_mask,
 376         .set_lvt_mode           = xen_pv_lapic_set_lvt_mode,
 377         .set_lvt_polarity       = xen_pv_lapic_set_lvt_polarity,
 378         .set_lvt_triggermode    = xen_pv_lapic_set_lvt_triggermode,
 379 };
 380
 381 #ifdef SMP
 382 /*---------------------------- XEN PV IPI Handlers ---------------------------*/
 383 /*
 384  * These are C clones of the ASM functions found in apic_vector.
 385  */
 386 static int
 387 xen_ipi_bitmap_handler(void *arg)
 388 {
 389         struct trapframe *frame;
 390
 391         frame = arg;
 392         ipi_bitmap_handler(*frame);
 393         return (FILTER_HANDLED);
 394 }
 395
 396 static int
 397 xen_smp_rendezvous_action(void *arg)
 398 {
 399 #ifdef COUNT_IPIS
 400         (*ipi_rendezvous_counts[PCPU_GET(cpuid)])++;
 401 #endif /* COUNT_IPIS */
 402
 403         smp_rendezvous_action();
 404         return (FILTER_HANDLED);
 405 }
 406
 407 static int
 408 xen_invltlb(void *arg)
 409 {
 410
 411         invltlb_handler();
 412         return (FILTER_HANDLED);
 413 }
 414
 415 #ifdef __amd64__
 416 static int
 417 xen_invltlb_pcid(void *arg)
 418 {
 419
 420         invltlb_pcid_handler();
 421         return (FILTER_HANDLED);
 422 }
 423 #endif
 424
 425 static int
 426 xen_invlpg(void *arg)
 427 {
 428
 429         invlpg_handler();
 430         return (FILTER_HANDLED);
 431 }
 432
 433 #ifdef __amd64__
 434 static int
 435 xen_invlpg_pcid(void *arg)
 436 {
 437
 438         invlpg_pcid_handler();
 439         return (FILTER_HANDLED);
 440 }
 441 #endif
 442
 443 static int
 444 xen_invlrng(void *arg)
 445 {
 446
 447         invlrng_handler();
 448         return (FILTER_HANDLED);
 449 }
 450
 451 static int
 452 xen_invlcache(void *arg)
 453 {
 454
 455         invlcache_handler();
 456         return (FILTER_HANDLED);
 457 }
 458
 459 #ifdef __i386__
 460 static int
 461 xen_lazypmap(void *arg)
 462 {
 463
 464         pmap_lazyfix_action();
 465         return (FILTER_HANDLED);
 466 }
 467 #endif
 468
 469 static int
 470 xen_cpustop_handler(void *arg)
 471 {
 472
 473         cpustop_handler();
 474         return (FILTER_HANDLED);
 475 }
 476
 477 static int
 478 xen_cpususpend_handler(void *arg)
 479 {
 480
 481         cpususpend_handler();
 482         return (FILTER_HANDLED);
 483 }
 484
 485 static int
 486 xen_cpustophard_handler(void *arg)
 487 {
 488
 489         ipi_nmi_handler();
 490         return (FILTER_HANDLED);
 491 }
 492
 493 /*----------------------------- XEN PV IPI setup -----------------------------*/
 494 /*
 495  * Those functions are provided outside of the Xen PV APIC implementation
 496  * so PVHVM guests can also use PV IPIs without having an actual Xen PV APIC,
 497  * because on PVHVM there's an emulated LAPIC provided by Xen.
 498  */
 499 static void
 500 xen_cpu_ipi_init(int cpu)
 501 {
 502         xen_intr_handle_t *ipi_handle;
 503         const struct xen_ipi_handler *ipi;
 504         device_t dev;
 505         int idx, rc;
 506
 507         ipi_handle = DPCPU_ID_GET(cpu, ipi_handle);
 508         dev = pcpu_find(cpu)->pc_device;
 509         KASSERT((dev != NULL), ("NULL pcpu device_t"));
 510
 511         for (ipi = xen_ipis, idx = 0; idx < nitems(xen_ipis); ipi++, idx++) {
 512
 513                 if (ipi->filter == NULL) {
 514                         ipi_handle[idx] = NULL;
 515                         continue;
 516                 }
 517
 518                 rc = xen_intr_alloc_and_bind_ipi(dev, cpu, ipi->filter,
 519                     INTR_TYPE_TTY, &ipi_handle[idx]);
 520                 if (rc != 0)
 521                         panic("Unable to allocate a XEN IPI port");
 522                 xen_intr_describe(ipi_handle[idx], "%s", ipi->description);
 523         }
 524 }
 525
 526 static void
 527 xen_setup_cpus(void)
 528 {
 529         int i;
 530
 531         if (!xen_vector_callback_enabled)
 532                 return;
 533
 534 #ifdef __amd64__
 535         if (pmap_pcid_enabled) {
 536                 xen_ipis[IPI_TO_IDX(IPI_INVLTLB)].filter = xen_invltlb_pcid;
 537                 xen_ipis[IPI_TO_IDX(IPI_INVLPG)].filter = xen_invlpg_pcid;
 538         }
 539 #endif
 540         CPU_FOREACH(i)
 541                 xen_cpu_ipi_init(i);
 542
 543         /* Set the xen pv ipi ops to replace the native ones */
 544         if (xen_hvm_domain())
 545                 apic_ops.ipi_vectored = xen_pv_lapic_ipi_vectored;
 546 }
 547
 548 /* We need to setup IPIs before APs are started */
 549 SYSINIT(xen_setup_cpus, SI_SUB_SMP-1, SI_ORDER_FIRST, xen_setup_cpus, NULL);
 550 #endif /* SMP */