sys/platform/pc64/amd64/mp.c

   1 /*
   2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/platform/pc64/amd64/mp.c,v 1.2 2007/09/24 03:24:45 yanyh Exp $
  35  */
  36
  37
  38 #include <sys/interrupt.h>
  39 #include <sys/kernel.h>
  40 #include <sys/memrange.h>
  41 #include <sys/tls.h>
  42 #include <sys/types.h>
  43
  44 #include <vm/vm_extern.h>
  45 #include <vm/vm_kern.h>
  46 #include <vm/vm_object.h>
  47 #include <vm/vm_page.h>
  48
  49 #include <machine/cpu.h>
  50 #include <machine/cpufunc.h>
  51 #include <machine/globaldata.h>
  52 #include <machine/md_var.h>
  53 #include <machine/pmap.h>
  54 #include <machine/smp.h>
  55 #include <machine/tls.h>
  56
  57 #include <unistd.h>
  58 #include <pthread.h>
  59 #include <signal.h>
  60 #include <stdio.h>
  61
  62 extern pt_entry_t *KPTphys;
  63
  64 volatile u_int  stopped_cpus;
  65 cpumask_t       smp_active_mask = 1;  /* which cpus are ready for IPIs etc? */
  66 static int      boot_address;
  67 static cpumask_t smp_startup_mask = 1;  /* which cpus have been started */
  68 int             mp_naps;                /* # of Applications processors */
  69 static int  mp_finish;
  70
  71 /* function prototypes XXX these should go elsewhere */
  72 void bootstrap_idle(void);
  73 void single_cpu_ipi(int, int, int);
  74 void selected_cpu_ipi(u_int, int, int);
  75 #if 0
  76 void ipi_handler(int);
  77 #endif
  78
  79 pt_entry_t *SMPpt;
  80
  81 /* AP uses this during bootstrap.  Do not staticize.  */
  82 char *bootSTK;
  83 static int bootAP;
  84
  85
  86 /* XXX these need to go into the appropriate header file */
  87 static int start_all_aps(u_int);
  88 void init_secondary(void);
  89 void *start_ap(void *);
  90
  91 /*
  92  * Get SMP fully working before we start initializing devices.
  93  */
  94 static
  95 void
  96 ap_finish(void)
  97 {
  98         int i;
  99         cpumask_t ncpus_mask = 0;
 100
 101         for (i = 1; i <= ncpus; i++)
 102                 ncpus_mask |= (1 << i);
 103
 104         mp_finish = 1;
 105         if (bootverbose)
 106                 kprintf("Finish MP startup\n");
 107
 108         /* build our map of 'other' CPUs */
 109         mycpu->gd_other_cpus = smp_startup_mask & ~(1 << mycpu->gd_cpuid);
 110
 111         /*
 112          * Let the other cpu's finish initializing and build their map
 113          * of 'other' CPUs.
 114          */
 115         rel_mplock();
 116         while (smp_active_mask != smp_startup_mask) {
 117                 DELAY(100000);
 118                 cpu_lfence();
 119         }
 120
 121         while (try_mplock() == 0)
 122                 DELAY(100000);
 123         if (bootverbose)
 124                 kprintf("Active CPU Mask: %08x\n", smp_active_mask);
 125 }
 126
 127 SYSINIT(finishsmp, SI_BOOT2_FINISH_SMP, SI_ORDER_FIRST, ap_finish, NULL)
 128
 129
 130 void *
 131 start_ap(void *arg __unused)
 132 {
 133         init_secondary();
 134         setrealcpu();
 135         bootstrap_idle();
 136
 137         return(NULL); /* NOTREACHED */
 138 }
 139
 140 /* storage for AP thread IDs */
 141 pthread_t ap_tids[MAXCPU];
 142
 143 void
 144 mp_start(void)
 145 {
 146         int shift;
 147
 148         ncpus = optcpus;
 149
 150         mp_naps = ncpus - 1;
 151
 152         /* ncpus2 -- ncpus rounded down to the nearest power of 2 */
 153         for (shift = 0; (1 << shift) <= ncpus; ++shift)
 154                 ;
 155         --shift;
 156         ncpus2_shift = shift;
 157         ncpus2 = 1 << shift;
 158         ncpus2_mask = ncpus2 - 1;
 159
 160         /* ncpus_fit -- ncpus rounded up to the nearest power of 2 */
 161         if ((1 << shift) < ncpus)
 162                 ++shift;
 163         ncpus_fit = 1 << shift;
 164         ncpus_fit_mask = ncpus_fit - 1;
 165
 166         /*
 167          * cpu0 initialization
 168          */
 169         mycpu->gd_ipiq = (void *)kmem_alloc(&kernel_map,
 170                                             sizeof(lwkt_ipiq) * ncpus);
 171         bzero(mycpu->gd_ipiq, sizeof(lwkt_ipiq) * ncpus);
 172
 173         /*
 174          * cpu 1-(n-1)
 175          */
 176         start_all_aps(boot_address);
 177
 178 }
 179
 180 void
 181 mp_announce(void)
 182 {
 183         int x;
 184
 185         kprintf("DragonFly/MP: Multiprocessor\n");
 186         kprintf(" cpu0 (BSP)\n");
 187
 188         for (x = 1; x <= mp_naps; ++x)
 189                 kprintf(" cpu%d (AP)\n", x);
 190 }
 191
 192 void
 193 forward_fastint_remote(void *arg)
 194 {
 195         panic("XXX forward_fastint_remote()");
 196 }
 197
 198 void
 199 cpu_send_ipiq(int dcpu)
 200 {
 201         if ((1 << dcpu) & smp_active_mask)
 202                 if (pthread_kill(ap_tids[dcpu], SIGUSR1) != 0)
 203                         panic("pthread_kill failed in cpu_send_ipiq");
 204 #if 0
 205         panic("XXX cpu_send_ipiq()");
 206 #endif
 207 }
 208
 209 void
 210 smp_invltlb(void)
 211 {
 212 #ifdef SMP
 213 #endif
 214 }
 215
 216 void
 217 single_cpu_ipi(int cpu, int vector, int delivery_mode)
 218 {
 219         kprintf("XXX single_cpu_ipi\n");
 220 }
 221
 222 void
 223 selected_cpu_ipi(u_int target, int vector, int delivery_mode)
 224 {
 225         crit_enter();
 226         while (target) {
 227                 int n = bsfl(target);
 228                 target &= ~(1 << n);
 229                 single_cpu_ipi(n, vector, delivery_mode);
 230         }
 231         crit_exit();
 232 }
 233
 234 int
 235 stop_cpus(u_int map)
 236 {
 237         map &= smp_active_mask;
 238
 239         crit_enter();
 240         while (map) {
 241                 int n = bsfl(map);
 242                 map &= ~(1 << n);
 243                 if (pthread_kill(ap_tids[n], SIGSTOP) != 0)
 244                         panic("stop_cpus: pthread_kill failed");
 245         }
 246         crit_exit();
 247 #if 0
 248         panic("XXX stop_cpus()");
 249 #endif
 250
 251         return(1);
 252 }
 253
 254 int
 255 restart_cpus(u_int map)
 256 {
 257         map &= smp_active_mask;
 258
 259         crit_enter();
 260         while (map) {
 261                 int n = bsfl(map);
 262                 map &= ~(1 << n);
 263                 if (pthread_kill(ap_tids[n], SIGCONT) != 0)
 264                         panic("restart_cpus: pthread_kill failed");
 265         }
 266         crit_exit();
 267 #if 0
 268         panic("XXX restart_cpus()");
 269 #endif
 270
 271         return(1);
 272 }
 273
 274 void
 275 ap_init(void)
 276 {
 277         /*
 278          * Adjust smp_startup_mask to signal the BSP that we have started
 279          * up successfully.  Note that we do not yet hold the BGL.  The BSP
 280          * is waiting for our signal.
 281          *
 282          * We can't set our bit in smp_active_mask yet because we are holding
 283          * interrupts physically disabled and remote cpus could deadlock
 284          * trying to send us an IPI.
 285          */
 286         smp_startup_mask |= 1 << mycpu->gd_cpuid;
 287         cpu_mfence();
 288
 289         /*
 290          * Interlock for finalization.  Wait until mp_finish is non-zero,
 291          * then get the MP lock.
 292          *
 293          * Note: We are in a critical section.
 294          *
 295          * Note: We have to synchronize td_mpcount to our desired MP state
 296          * before calling cpu_try_mplock().
 297          *
 298          * Note: we are the idle thread, we can only spin.
 299          *
 300          * Note: The load fence is memory volatile and prevents the compiler
 301          * from improperly caching mp_finish, and the cpu from improperly
 302          * caching it.
 303          */
 304
 305         while (mp_finish == 0) {
 306                 cpu_lfence();
 307                 DELAY(500000);
 308         }
 309         ++curthread->td_mpcount;
 310         while (cpu_try_mplock() == 0)
 311                 DELAY(100000);
 312
 313         /* BSP may have changed PTD while we're waiting for the lock */
 314         cpu_invltlb();
 315
 316         /* Build our map of 'other' CPUs. */
 317         mycpu->gd_other_cpus = smp_startup_mask & ~(1 << mycpu->gd_cpuid);
 318
 319         kprintf("SMP: AP CPU #%d Launched!\n", mycpu->gd_cpuid);
 320
 321
 322         /* Set memory range attributes for this CPU to match the BSP */
 323         mem_range_AP_init();
 324         /*
 325          * Once we go active we must process any IPIQ messages that may
 326          * have been queued, because no actual IPI will occur until we
 327          * set our bit in the smp_active_mask.  If we don't the IPI
 328          * message interlock could be left set which would also prevent
 329          * further IPIs.
 330          *
 331          * The idle loop doesn't expect the BGL to be held and while
 332          * lwkt_switch() normally cleans things up this is a special case
 333          * because we returning almost directly into the idle loop.
 334          *
 335          * The idle thread is never placed on the runq, make sure
 336          * nothing we've done put it there.
 337          */
 338         KKASSERT(curthread->td_mpcount == 1);
 339         smp_active_mask |= 1 << mycpu->gd_cpuid;
 340
 341         mdcpu->gd_fpending = 0;
 342         mdcpu->gd_ipending = 0;
 343         initclocks_pcpu();      /* clock interrupts (via IPIs) */
 344         lwkt_process_ipiq();
 345
 346         /*
 347          * Releasing the mp lock lets the BSP finish up the SMP init
 348          */
 349         rel_mplock();
 350         KKASSERT((curthread->td_flags & TDF_RUNQ) == 0);
 351 }
 352
 353 void
 354 init_secondary(void)
 355 {
 356         int     myid = bootAP;
 357         struct mdglobaldata *md;
 358         struct privatespace *ps;
 359
 360         ps = &CPU_prvspace[myid];
 361
 362         KKASSERT(ps->mdglobaldata.mi.gd_prvspace == ps);
 363
 364         /*
 365          * Setup the %gs for cpu #n.  The mycpu macro works after this
 366          * point.
 367          */
 368         tls_set_fs(&CPU_prvspace[myid], sizeof(struct privatespace));
 369
 370         md = mdcpu;     /* loaded through %fs:0 (mdglobaldata.mi.gd_prvspace)*/
 371
 372         md->gd_common_tss.tss_esp0 = 0; /* not used until after switch */
 373         md->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
 374         md->gd_common_tss.tss_ioopt = (sizeof md->gd_common_tss) << 16;
 375
 376         /*
 377          * Set to a known state:
 378          * Set by mpboot.s: CR0_PG, CR0_PE
 379          * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
 380          */
 381 }
 382
 383 static int
 384 start_all_aps(u_int boot_addr)
 385 {
 386         int x, i;
 387         struct mdglobaldata *gd;
 388         struct privatespace *ps;
 389         vm_page_t m;
 390         vm_offset_t va;
 391 #if 0
 392         struct lwp_params params;
 393 #endif
 394
 395         /*
 396          * needed for ipis to initial thread
 397          * FIXME: rename ap_tids?
 398          */
 399         ap_tids[0] = pthread_self();
 400
 401         for (x = 1; x <= mp_naps; x++)
 402         {
 403                 /* Allocate space for the CPU's private space. */
 404                 va = (vm_offset_t)&CPU_prvspace[x];
 405                 for (i = 0; i < sizeof(struct mdglobaldata); i += PAGE_SIZE) {
 406                         va =(vm_offset_t)&CPU_prvspace[x].mdglobaldata + i;
 407                         m = vm_page_alloc(&kernel_object, va, VM_ALLOC_SYSTEM);
 408                         pmap_kenter_quick(va, m->phys_addr);
 409                 }
 410
 411                 for (i = 0; i < sizeof(CPU_prvspace[x].idlestack); i += PAGE_SIZE) {
 412                         va =(vm_offset_t)&CPU_prvspace[x].idlestack + i;
 413                         m = vm_page_alloc(&kernel_object, va, VM_ALLOC_SYSTEM);
 414                         pmap_kenter_quick(va, m->phys_addr);
 415                 }
 416
 417                 gd = &CPU_prvspace[x].mdglobaldata;     /* official location */
 418                 bzero(gd, sizeof(*gd));
 419                 gd->mi.gd_prvspace = ps = &CPU_prvspace[x];
 420
 421                 /* prime data page for it to use */
 422                 mi_gdinit(&gd->mi, x);
 423                 cpu_gdinit(gd, x);
 424
 425 #if 0
 426                 gd->gd_CMAP1 = pmap_kpte((vm_offset_t)CPU_prvspace[x].CPAGE1);
 427                 gd->gd_CMAP2 = pmap_kpte((vm_offset_t)CPU_prvspace[x].CPAGE2);
 428                 gd->gd_CMAP3 = pmap_kpte((vm_offset_t)CPU_prvspace[x].CPAGE3);
 429                 gd->gd_PMAP1 = pmap_kpte((vm_offset_t)CPU_prvspace[x].PPAGE1);
 430                 gd->gd_CADDR1 = ps->CPAGE1;
 431                 gd->gd_CADDR2 = ps->CPAGE2;
 432                 gd->gd_CADDR3 = ps->CPAGE3;
 433                 gd->gd_PADDR1 = (vpte_t *)ps->PPAGE1;
 434 #endif
 435
 436                 gd->mi.gd_ipiq = (void *)kmem_alloc(&kernel_map, sizeof(lwkt_ipiq) * (mp_naps + 1));
 437                 bzero(gd->mi.gd_ipiq, sizeof(lwkt_ipiq) * (mp_naps + 1));
 438
 439                 /*
 440                  * Setup the AP boot stack
 441                  */
 442                 bootSTK = &ps->idlestack[UPAGES*PAGE_SIZE/2];
 443                 bootAP = x;
 444
 445                 /*
 446                  * Setup the AP's lwp, this is the 'cpu'
 447                  */
 448                 pthread_create(&ap_tids[x], NULL, start_ap, NULL);
 449
 450                 while((smp_startup_mask & (1 << x)) == 0) {
 451                         cpu_lfence(); /* XXX spin until the AP has started */
 452                         DELAY(1000);
 453                 }
 454         }
 455
 456         return(ncpus - 1);
 457 }