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/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 46 extern struct pcpu __pcpu[MAXCPU]; 47 48 volatile static int ap_awake; 49 volatile static u_int ap_state; 50 volatile static uint32_t ap_decr; 51 volatile static uint32_t ap_tbl; 52 53 void 54 machdep_ap_bootstrap(void) 55 { 56 57 pcpup->pc_awake = 1; 58 59 while (ap_state == 0) 60 ; 61 62 mtspr(SPR_TBL, 0); 63 mtspr(SPR_TBU, 0); 64 mtspr(SPR_TBL, ap_tbl); 65 __asm __volatile("mtdec %0" :: "r"(ap_decr)); 66 67 ap_awake++; 68 69 /* Initialize curthread. */ 70 PCPU_SET(curthread, PCPU_GET(idlethread)); 71 PCPU_SET(curpcb, curthread->td_pcb); 72 73 mtmsr(mfmsr() | PSL_EE); 74 sched_throw(NULL); 75 } 76 77 struct cpu_group * 78 cpu_topo(void) 79 { 80 81 return (smp_topo_none()); 82 } 83 84 void 85 cpu_mp_setmaxid(void) 86 { 87 struct cpuref cpuref; 88 int error; 89 90 mp_ncpus = 0; 91 error = powerpc_smp_first_cpu(&cpuref); 92 while (!error) { 93 mp_ncpus++; 94 error = powerpc_smp_next_cpu(&cpuref); 95 } 96 /* Sanity. */ 97 if (mp_ncpus == 0) 98 mp_ncpus = 1; 99 100 /* 101 * Set the largest cpuid we're going to use. This is necessary 102 * for VM initialization. 103 */ 104 mp_maxid = min(mp_ncpus, MAXCPU) - 1; 105 } 106 107 int 108 cpu_mp_probe(void) 109 { 110 111 /* 112 * We're not going to enable SMP if there's only 1 processor. 113 */ 114 return (mp_ncpus > 1); 115 } 116 117 void 118 cpu_mp_start(void) 119 { 120 struct cpuref bsp, cpu; 121 struct pcpu *pc; 122 int error; 123 124 error = powerpc_smp_get_bsp(&bsp); 125 KASSERT(error == 0, ("Don't know BSP")); 126 KASSERT(bsp.cr_cpuid == 0, ("%s: cpuid != 0", __func__)); 127 128 error = powerpc_smp_first_cpu(&cpu); 129 while (!error) { 130 if (cpu.cr_cpuid >= MAXCPU) { 131 printf("SMP: cpu%d: skipped -- ID out of range\n", 132 cpu.cr_cpuid); 133 goto next; 134 } 135 if (all_cpus & (1 << cpu.cr_cpuid)) { 136 printf("SMP: cpu%d: skipped - duplicate ID\n", 137 cpu.cr_cpuid); 138 goto next; 139 } 140 if (cpu.cr_cpuid != bsp.cr_cpuid) { 141 pc = &__pcpu[cpu.cr_cpuid]; 142 pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc)); 143 } else { 144 pc = pcpup; 145 pc->pc_cpuid = bsp.cr_cpuid; 146 pc->pc_bsp = 1; 147 } 148 pc->pc_cpumask = 1 << pc->pc_cpuid; 149 pc->pc_hwref = cpu.cr_hwref; 150 all_cpus |= pc->pc_cpumask; 151 152 next: 153 error = powerpc_smp_next_cpu(&cpu); 154 } 155 } 156 157 void 158 cpu_mp_announce(void) 159 { 160 struct pcpu *pc; 161 int i; 162 163 for (i = 0; i <= mp_maxid; i++) { 164 pc = pcpu_find(i); 165 if (pc == NULL) 166 continue; 167 printf("cpu%d: dev=%x", i, pc->pc_hwref); 168 if (pc->pc_bsp) 169 printf(" (BSP)"); 170 printf("\n"); 171 } 172 } 173 174 static void 175 cpu_mp_unleash(void *dummy) 176 { 177 struct pcpu *pc; 178 int cpus; 179 180 if (mp_ncpus <= 1) 181 return; 182 183 cpus = 0; 184 smp_cpus = 0; 185 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 186 cpus++; 187 pc->pc_other_cpus = all_cpus & ~pc->pc_cpumask; 188 if (!pc->pc_bsp) { 189 printf("Waking up CPU %d (dev=%x)\n", pc->pc_cpuid, 190 pc->pc_hwref); 191 powerpc_smp_start_cpu(pc); 192 } else { 193 __asm __volatile("mfspr %0,1023" : "=r"(pc->pc_pir)); 194 pc->pc_awake = 1; 195 } 196 if (pc->pc_awake) 197 smp_cpus++; 198 } 199 200 ap_awake = 1; 201 202 __asm __volatile("mftb %0" : "=r"(ap_tbl)); 203 ap_tbl += 10; 204 __asm __volatile("mfdec %0" : "=r"(ap_decr)); 205 ap_state++; 206 powerpc_sync(); 207 208 mtspr(SPR_TBL, 0); 209 mtspr(SPR_TBU, 0); 210 mtspr(SPR_TBL, ap_tbl); 211 212 while (ap_awake < smp_cpus) 213 ; 214 215 if (smp_cpus != cpus || cpus != mp_ncpus) { 216 printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n", 217 mp_ncpus, cpus, smp_cpus); 218 } 219 220 smp_active = 1; 221 smp_started = 1; 222 } 223 224 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL); 225 226 static u_int ipi_msg_cnt[32]; 227 228 int 229 powerpc_ipi_handler(void *arg) 230 { 231 cpumask_t self; 232 uint32_t ipimask; 233 int msg; 234 235 ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask)); 236 if (ipimask == 0) 237 return (FILTER_STRAY); 238 while ((msg = ffs(ipimask) - 1) != -1) { 239 ipimask &= ~(1u << msg); 240 ipi_msg_cnt[msg]++; 241 switch (msg) { 242 case IPI_AST: 243 break; 244 case IPI_PREEMPT: 245 sched_preempt(curthread); 246 break; 247 case IPI_RENDEZVOUS: 248 smp_rendezvous_action(); 249 break; 250 case IPI_STOP: 251 self = PCPU_GET(cpumask); 252 savectx(PCPU_GET(curpcb)); 253 atomic_set_int(&stopped_cpus, self); 254 while ((started_cpus & self) == 0) 255 cpu_spinwait(); 256 atomic_clear_int(&started_cpus, self); 257 atomic_clear_int(&stopped_cpus, self); 258 break; 259 } 260 } 261 262 return (FILTER_HANDLED); 263 } 264 265 static void 266 ipi_send(struct pcpu *pc, int ipi) 267 { 268 269 atomic_set_32(&pc->pc_ipimask, (1 << ipi)); 270 PIC_IPI(pic, pc->pc_cpuid); 271 } 272 273 /* Send an IPI to a set of cpus. */ 274 void 275 ipi_selected(cpumask_t cpus, int ipi) 276 { 277 struct pcpu *pc; 278 279 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 280 if (cpus & pc->pc_cpumask) 281 ipi_send(pc, ipi); 282 } 283 } 284 285 /* Send an IPI to all CPUs EXCEPT myself. */ 286 void 287 ipi_all_but_self(int ipi) 288 { 289 struct pcpu *pc; 290 291 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 292 if (pc != pcpup) 293 ipi_send(pc, ipi); 294 } 295 } 296