mp_machdep.c revision 183030
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: head/sys/powerpc/powerpc/mp_machdep.c 183030 2008-09-15 01:03:16Z marcel $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/bus.h> 34#include <sys/pcpu.h> 35#include <sys/proc.h> 36#include <sys/sched.h> 37#include <sys/smp.h> 38 39#include <machine/bus.h> 40#include <machine/cpu.h> 41#include <machine/intr_machdep.h> 42#include <machine/smp.h> 43 44#include "pic_if.h" 45 46extern struct pcpu __pcpu[MAXCPU]; 47 48volatile static int ap_awake; 49volatile static u_int ap_state; 50volatile static uint32_t ap_decr; 51 52int mp_ipi_test = 0; 53 54void 55machdep_ap_bootstrap(volatile uint32_t *trcp) 56{ 57 58 trcp[0] = 0x3000; 59 trcp[1] = (uint32_t)&machdep_ap_bootstrap; 60 61 // __asm __volatile("mtspr 1023,%0" :: "r"(PCPU_GET(cpuid))); 62 __asm __volatile("mfspr %0,1023" : "=r"(pcpup->pc_pir)); 63 pcpup->pc_awake = 1; 64 65 while (ap_state == 0) 66 ; 67 68 __asm __volatile("mtdec %0" :: "r"(ap_decr)); 69 70 ap_awake++; 71 72 /* Initialize curthread. */ 73 PCPU_SET(curthread, PCPU_GET(idlethread)); 74 75 mtmsr(mfmsr() | PSL_EE); 76 sched_throw(NULL); 77} 78 79struct cpu_group * 80cpu_topo(void) 81{ 82 83 return (smp_topo_none()); 84} 85 86void 87cpu_mp_setmaxid(void) 88{ 89 struct cpuref cpuref; 90 int error; 91 92 mp_ncpus = 0; 93 error = powerpc_smp_first_cpu(&cpuref); 94 while (!error) { 95 mp_ncpus++; 96 error = powerpc_smp_next_cpu(&cpuref); 97 } 98 /* Sanity. */ 99 if (mp_ncpus == 0) 100 mp_ncpus = 1; 101 102 /* 103 * Set the largest cpuid we're going to use. This is necessary 104 * for VM initialization. 105 */ 106 mp_maxid = min(mp_ncpus, MAXCPU) - 1; 107} 108 109int 110cpu_mp_probe(void) 111{ 112 113 /* 114 * We're not going to enable SMP if there's only 1 processor. 115 */ 116 return (mp_ncpus > 1); 117} 118 119void 120cpu_mp_start(void) 121{ 122 struct cpuref bsp, cpu; 123 struct pcpu *pc; 124 int error; 125 126 error = powerpc_smp_get_bsp(&bsp); 127 KASSERT(error == 0, ("Don't know BSP")); 128 KASSERT(bsp.cr_cpuid == 0, ("%s: cpuid != 0", __func__)); 129 130 error = powerpc_smp_first_cpu(&cpu); 131 while (!error) { 132 if (cpu.cr_cpuid >= MAXCPU) { 133 printf("SMP: cpu%d: skipped -- ID out of range\n", 134 cpu.cr_cpuid); 135 goto next; 136 } 137 if (all_cpus & (1 << cpu.cr_cpuid)) { 138 printf("SMP: cpu%d: skipped - duplicate ID\n", 139 cpu.cr_cpuid); 140 goto next; 141 } 142 if (cpu.cr_cpuid != bsp.cr_cpuid) { 143 pc = &__pcpu[cpu.cr_cpuid]; 144 pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc)); 145 } else { 146 pc = pcpup; 147 pc->pc_cpuid = bsp.cr_cpuid; 148 pc->pc_bsp = 1; 149 } 150 pc->pc_cpumask = 1 << pc->pc_cpuid; 151 pc->pc_hwref = cpu.cr_hwref; 152 all_cpus |= pc->pc_cpumask; 153 154 next: 155 error = powerpc_smp_next_cpu(&cpu); 156 } 157} 158 159void 160cpu_mp_announce(void) 161{ 162 struct pcpu *pc; 163 int i; 164 165 for (i = 0; i <= mp_maxid; i++) { 166 pc = pcpu_find(i); 167 if (pc == NULL) 168 continue; 169 printf("cpu%d: dev=%x", i, pc->pc_hwref); 170 if (pc->pc_bsp) 171 printf(" (BSP)"); 172 printf("\n"); 173 } 174} 175 176static void 177cpu_mp_unleash(void *dummy) 178{ 179 struct pcpu *pc; 180 int cpus; 181 182 if (mp_ncpus <= 1) 183 return; 184 185 if (mp_ipi_test != 1) { 186 printf("SMP: ERROR: sending of a test IPI failed\n"); 187 return; 188 } 189 190 cpus = 0; 191 smp_cpus = 0; 192 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 193 cpus++; 194 pc->pc_other_cpus = all_cpus & ~pc->pc_cpumask; 195 if (!pc->pc_bsp) { 196 printf("Waking up CPU %d (dev=%x)\n", pc->pc_cpuid, 197 pc->pc_hwref); 198 powerpc_smp_start_cpu(pc); 199 } else { 200 __asm __volatile("mfspr %0,1023" : "=r"(pc->pc_pir)); 201 pc->pc_awake = 1; 202 } 203 if (pc->pc_awake) 204 smp_cpus++; 205 } 206 207 ap_awake = 1; 208 __asm __volatile("mfdec %0" : "=r"(ap_decr)); 209 ap_state++; 210 211 while (ap_awake < smp_cpus) 212 ; 213 214 if (smp_cpus != cpus || cpus != mp_ncpus) { 215 printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n", 216 mp_ncpus, cpus, smp_cpus); 217 } 218 219 smp_active = 1; 220 smp_started = 1; 221} 222 223SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL); 224 225static u_int ipi_msg_cnt[32]; 226 227int 228powerpc_ipi_handler(void *arg) 229{ 230 cpumask_t self; 231 uint32_t ipimask; 232 int msg; 233 234 ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask)); 235 if (ipimask == 0) 236 return (FILTER_STRAY); 237 while ((msg = ffs(ipimask) - 1) != -1) { 238 ipimask &= ~(1u << msg); 239 ipi_msg_cnt[msg]++; 240 switch (msg) { 241 case IPI_AST: 242 break; 243 case IPI_PREEMPT: 244 sched_preempt(curthread); 245 break; 246 case IPI_RENDEZVOUS: 247 smp_rendezvous_action(); 248 break; 249 case IPI_STOP: 250 self = PCPU_GET(cpumask); 251 savectx(PCPU_GET(curpcb)); 252 atomic_set_int(&stopped_cpus, self); 253 while ((started_cpus & self) == 0) 254 cpu_spinwait(); 255 atomic_clear_int(&started_cpus, self); 256 atomic_clear_int(&stopped_cpus, self); 257 break; 258 case IPI_PPC_TEST: 259 mp_ipi_test++; 260 break; 261 } 262 } 263 264 return (FILTER_HANDLED); 265} 266 267static void 268ipi_send(struct pcpu *pc, int ipi) 269{ 270 271 atomic_set_32(&pc->pc_ipimask, (1 << ipi)); 272 PIC_IPI(pic, pc->pc_cpuid); 273} 274 275/* Send an IPI to a set of cpus. */ 276void 277ipi_selected(cpumask_t cpus, int ipi) 278{ 279 struct pcpu *pc; 280 281 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 282 if (cpus & pc->pc_cpumask) 283 ipi_send(pc, ipi); 284 } 285} 286 287/* Send an IPI to all CPUs, including myself. */ 288void 289ipi_all(int ipi) 290{ 291 struct pcpu *pc; 292 293 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 294 ipi_send(pc, ipi); 295 } 296} 297 298/* Send an IPI to all CPUs EXCEPT myself. */ 299void 300ipi_all_but_self(int ipi) 301{ 302 struct pcpu *pc; 303 304 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 305 if (pc != pcpup) 306 ipi_send(pc, ipi); 307 } 308} 309 310/* Send an IPI to myself. */ 311void 312ipi_self(int ipi) 313{ 314 315 ipi_send(pcpup, ipi); 316} 317