1 /*- 2 * Copyright (c) 2008 Marcel Moolenaar 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 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/ktr.h> 34 #include <sys/bus.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/pcpu.h> 38 #include <sys/proc.h> 39 #include <sys/sched.h> 40 #include <sys/smp.h> 41 42 #include <vm/vm.h> 43 #include <vm/vm_param.h> 44 #include <vm/pmap.h> 45 #include <vm/vm_map.h> 46 #include <vm/vm_extern.h> 47 #include <vm/vm_kern.h> 48 49 #include <machine/bus.h> 50 #include <machine/cpu.h> 51 #include <machine/intr_machdep.h> 52 #include <machine/platform.h> 53 #include <machine/md_var.h> 54 #include <machine/smp.h> 55 56 #include "pic_if.h" 57 58 extern struct pcpu __pcpu[MAXCPU]; 59 60 volatile static int ap_awake; 61 volatile static u_int ap_letgo; 62 volatile static u_quad_t ap_timebase; 63 static u_int ipi_msg_cnt[32]; 64 static struct mtx ap_boot_mtx; 65 66 void 67 machdep_ap_bootstrap(void) 68 { 69 /* Set up important bits on the CPU (HID registers, etc.) */ 70 cpudep_ap_setup(); 71 72 /* Set PIR */ 73 PCPU_SET(pir, mfspr(SPR_PIR)); 74 PCPU_SET(awake, 1); 75 __asm __volatile("msync; isync"); 76 77 while (ap_letgo == 0) 78 ; 79 80 /* Initialize DEC and TB, sync with the BSP values */ 81 mttb(ap_timebase); 82 decr_ap_init(); 83 84 /* Serialize console output and AP count increment */ 85 mtx_lock_spin(&ap_boot_mtx); 86 ap_awake++; 87 printf("SMP: AP CPU #%d launched\n", PCPU_GET(cpuid)); 88 mtx_unlock_spin(&ap_boot_mtx); 89 90 /* Initialize curthread */ 91 PCPU_SET(curthread, PCPU_GET(idlethread)); 92 PCPU_SET(curpcb, curthread->td_pcb); 93 94 /* Start per-CPU event timers. */ 95 cpu_initclocks_ap(); 96 97 /* Announce ourselves awake, and enter the scheduler */ 98 sched_throw(NULL); 99 } 100 101 struct cpu_group * 102 cpu_topo(void) 103 { 104 105 return (smp_topo_none()); 106 } 107 108 void 109 cpu_mp_setmaxid(void) 110 { 111 struct cpuref cpuref; 112 int error; 113 114 mp_ncpus = 0; 115 error = platform_smp_first_cpu(&cpuref); 116 while (!error) { 117 mp_ncpus++; 118 error = platform_smp_next_cpu(&cpuref); 119 } 120 /* Sanity. */ 121 if (mp_ncpus == 0) 122 mp_ncpus = 1; 123 124 /* 125 * Set the largest cpuid we're going to use. This is necessary 126 * for VM initialization. 127 */ 128 mp_maxid = min(mp_ncpus, MAXCPU) - 1; 129 } 130 131 int 132 cpu_mp_probe(void) 133 { 134 135 /* 136 * We're not going to enable SMP if there's only 1 processor. 137 */ 138 return (mp_ncpus > 1); 139 } 140 141 void 142 cpu_mp_start(void) 143 { 144 struct cpuref bsp, cpu; 145 struct pcpu *pc; 146 int error; 147 148 error = platform_smp_get_bsp(&bsp); 149 KASSERT(error == 0, ("Don't know BSP")); 150 KASSERT(bsp.cr_cpuid == 0, ("%s: cpuid != 0", __func__)); 151 152 error = platform_smp_first_cpu(&cpu); 153 while (!error) { 154 if (cpu.cr_cpuid >= MAXCPU) { 155 printf("SMP: cpu%d: skipped -- ID out of range\n", 156 cpu.cr_cpuid); 157 goto next; 158 } 159 if (all_cpus & (1 << cpu.cr_cpuid)) { 160 printf("SMP: cpu%d: skipped - duplicate ID\n", 161 cpu.cr_cpuid); 162 goto next; 163 } 164 if (cpu.cr_cpuid != bsp.cr_cpuid) { 165 void *dpcpu; 166 167 pc = &__pcpu[cpu.cr_cpuid]; 168 dpcpu = (void *)kmem_alloc(kernel_map, DPCPU_SIZE); 169 pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc)); 170 dpcpu_init(dpcpu, cpu.cr_cpuid); 171 } else { 172 pc = pcpup; 173 pc->pc_cpuid = bsp.cr_cpuid; 174 pc->pc_bsp = 1; 175 } 176 pc->pc_cpumask = 1 << pc->pc_cpuid; 177 pc->pc_hwref = cpu.cr_hwref; 178 all_cpus |= pc->pc_cpumask; 179 next: 180 error = platform_smp_next_cpu(&cpu); 181 } 182 } 183 184 void 185 cpu_mp_announce(void) 186 { 187 struct pcpu *pc; 188 int i; 189 190 for (i = 0; i <= mp_maxid; i++) { 191 pc = pcpu_find(i); 192 if (pc == NULL) 193 continue; 194 printf("cpu%d: dev=%x", i, (int)pc->pc_hwref); 195 if (pc->pc_bsp) 196 printf(" (BSP)"); 197 printf("\n"); 198 } 199 } 200 201 static void 202 cpu_mp_unleash(void *dummy) 203 { 204 struct pcpu *pc; 205 int cpus, timeout; 206 207 if (mp_ncpus <= 1) 208 return; 209 210 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN); 211 212 cpus = 0; 213 smp_cpus = 0; 214 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 215 cpus++; 216 pc->pc_other_cpus = all_cpus & ~pc->pc_cpumask; 217 if (!pc->pc_bsp) { 218 if (bootverbose) 219 printf("Waking up CPU %d (dev=%x)\n", 220 pc->pc_cpuid, (int)pc->pc_hwref); 221 222 platform_smp_start_cpu(pc); 223 224 timeout = 2000; /* wait 2sec for the AP */ 225 while (!pc->pc_awake && --timeout > 0) 226 DELAY(1000); 227 228 } else { 229 PCPU_SET(pir, mfspr(SPR_PIR)); 230 pc->pc_awake = 1; 231 } 232 if (pc->pc_awake) { 233 if (bootverbose) 234 printf("Adding CPU %d, pir=%x, awake=%x\n", 235 pc->pc_cpuid, pc->pc_pir, pc->pc_awake); 236 smp_cpus++; 237 } else 238 stopped_cpus |= (1 << pc->pc_cpuid); 239 } 240 241 ap_awake = 1; 242 243 /* Provide our current DEC and TB values for APs */ 244 ap_timebase = mftb() + 10; 245 __asm __volatile("msync; isync"); 246 247 /* Let APs continue */ 248 atomic_store_rel_int(&ap_letgo, 1); 249 250 mttb(ap_timebase); 251 252 while (ap_awake < smp_cpus) 253 ; 254 255 if (smp_cpus != cpus || cpus != mp_ncpus) { 256 printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n", 257 mp_ncpus, cpus, smp_cpus); 258 } 259 260 /* Let the APs get into the scheduler */ 261 DELAY(10000); 262 263 smp_active = 1; 264 smp_started = 1; 265 } 266 267 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL); 268 269 int 270 powerpc_ipi_handler(void *arg) 271 { 272 cpumask_t self; 273 uint32_t ipimask; 274 int msg; 275 276 CTR2(KTR_SMP, "%s: MSR 0x%08x", __func__, mfmsr()); 277 278 ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask)); 279 if (ipimask == 0) 280 return (FILTER_STRAY); 281 while ((msg = ffs(ipimask) - 1) != -1) { 282 ipimask &= ~(1u << msg); 283 ipi_msg_cnt[msg]++; 284 switch (msg) { 285 case IPI_AST: 286 CTR1(KTR_SMP, "%s: IPI_AST", __func__); 287 break; 288 case IPI_PREEMPT: 289 CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__); 290 sched_preempt(curthread); 291 break; 292 case IPI_RENDEZVOUS: 293 CTR1(KTR_SMP, "%s: IPI_RENDEZVOUS", __func__); 294 smp_rendezvous_action(); 295 break; 296 case IPI_STOP: 297 298 /* 299 * IPI_STOP_HARD is mapped to IPI_STOP so it is not 300 * necessary to add such case in the switch. 301 */ 302 CTR1(KTR_SMP, "%s: IPI_STOP or IPI_STOP_HARD (stop)", 303 __func__); 304 self = PCPU_GET(cpumask); 305 savectx(PCPU_GET(curpcb)); 306 atomic_set_int(&stopped_cpus, self); 307 while ((started_cpus & self) == 0) 308 cpu_spinwait(); 309 atomic_clear_int(&started_cpus, self); 310 atomic_clear_int(&stopped_cpus, self); 311 CTR1(KTR_SMP, "%s: IPI_STOP (restart)", __func__); 312 break; 313 case IPI_HARDCLOCK: 314 CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__); 315 hardclockintr(); 316 break; 317 } 318 } 319 320 return (FILTER_HANDLED); 321 } 322 323 static void 324 ipi_send(struct pcpu *pc, int ipi) 325 { 326 327 CTR4(KTR_SMP, "%s: pc=%p, targetcpu=%d, IPI=%d", __func__, 328 pc, pc->pc_cpuid, ipi); 329 330 atomic_set_32(&pc->pc_ipimask, (1 << ipi)); 331 PIC_IPI(root_pic, pc->pc_cpuid); 332 333 CTR1(KTR_SMP, "%s: sent", __func__); 334 } 335 336 /* Send an IPI to a set of cpus. */ 337 void 338 ipi_selected(cpumask_t cpus, int ipi) 339 { 340 struct pcpu *pc; 341 342 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 343 if (cpus & pc->pc_cpumask) 344 ipi_send(pc, ipi); 345 } 346 } 347 348 /* Send an IPI to a specific CPU. */ 349 void 350 ipi_cpu(int cpu, u_int ipi) 351 { 352 353 ipi_send(cpuid_to_pcpu[cpu], ipi); 354 } 355 356 /* Send an IPI to all CPUs EXCEPT myself. */ 357 void 358 ipi_all_but_self(int ipi) 359 { 360 struct pcpu *pc; 361 362 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 363 if (pc != pcpup) 364 ipi_send(pc, ipi); 365 } 366 } 367