1 /* smp.c: Sparc SMP support. 2 * 3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 4 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 5 * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org) 6 */ 7 8 #include <asm/head.h> 9 10 #include <linux/kernel.h> 11 #include <linux/sched.h> 12 #include <linux/threads.h> 13 #include <linux/smp.h> 14 #include <linux/interrupt.h> 15 #include <linux/kernel_stat.h> 16 #include <linux/init.h> 17 #include <linux/spinlock.h> 18 #include <linux/mm.h> 19 #include <linux/fs.h> 20 #include <linux/seq_file.h> 21 #include <linux/cache.h> 22 #include <linux/delay.h> 23 24 #include <asm/ptrace.h> 25 #include <linux/atomic.h> 26 27 #include <asm/irq.h> 28 #include <asm/page.h> 29 #include <asm/pgalloc.h> 30 #include <asm/pgtable.h> 31 #include <asm/oplib.h> 32 #include <asm/cacheflush.h> 33 #include <asm/tlbflush.h> 34 #include <asm/cpudata.h> 35 #include <asm/leon.h> 36 37 #include "irq.h" 38 39 volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,}; 40 41 cpumask_t smp_commenced_mask = CPU_MASK_NONE; 42 43 const struct sparc32_ipi_ops *sparc32_ipi_ops; 44 45 /* The only guaranteed locking primitive available on all Sparc 46 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically 47 * places the current byte at the effective address into dest_reg and 48 * places 0xff there afterwards. Pretty lame locking primitive 49 * compared to the Alpha and the Intel no? Most Sparcs have 'swap' 50 * instruction which is much better... 51 */ 52 53 void __cpuinit smp_store_cpu_info(int id) 54 { 55 int cpu_node; 56 int mid; 57 58 cpu_data(id).udelay_val = loops_per_jiffy; 59 60 cpu_find_by_mid(id, &cpu_node); 61 cpu_data(id).clock_tick = prom_getintdefault(cpu_node, 62 "clock-frequency", 0); 63 cpu_data(id).prom_node = cpu_node; 64 mid = cpu_get_hwmid(cpu_node); 65 66 if (mid < 0) { 67 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08d", id, cpu_node); 68 mid = 0; 69 } 70 cpu_data(id).mid = mid; 71 } 72 73 void __init smp_cpus_done(unsigned int max_cpus) 74 { 75 extern void smp4m_smp_done(void); 76 extern void smp4d_smp_done(void); 77 unsigned long bogosum = 0; 78 int cpu, num = 0; 79 80 for_each_online_cpu(cpu) { 81 num++; 82 bogosum += cpu_data(cpu).udelay_val; 83 } 84 85 printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 86 num, bogosum/(500000/HZ), 87 (bogosum/(5000/HZ))%100); 88 89 switch(sparc_cpu_model) { 90 case sun4m: 91 smp4m_smp_done(); 92 break; 93 case sun4d: 94 smp4d_smp_done(); 95 break; 96 case sparc_leon: 97 leon_smp_done(); 98 break; 99 case sun4e: 100 printk("SUN4E\n"); 101 BUG(); 102 break; 103 case sun4u: 104 printk("SUN4U\n"); 105 BUG(); 106 break; 107 default: 108 printk("UNKNOWN!\n"); 109 BUG(); 110 break; 111 } 112 } 113 114 void cpu_panic(void) 115 { 116 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); 117 panic("SMP bolixed\n"); 118 } 119 120 struct linux_prom_registers smp_penguin_ctable __cpuinitdata = { 0 }; 121 122 void smp_send_reschedule(int cpu) 123 { 124 /* 125 * CPU model dependent way of implementing IPI generation targeting 126 * a single CPU. The trap handler needs only to do trap entry/return 127 * to call schedule. 128 */ 129 sparc32_ipi_ops->resched(cpu); 130 } 131 132 void smp_send_stop(void) 133 { 134 } 135 136 void arch_send_call_function_single_ipi(int cpu) 137 { 138 /* trigger one IPI single call on one CPU */ 139 sparc32_ipi_ops->single(cpu); 140 } 141 142 void arch_send_call_function_ipi_mask(const struct cpumask *mask) 143 { 144 int cpu; 145 146 /* trigger IPI mask call on each CPU */ 147 for_each_cpu(cpu, mask) 148 sparc32_ipi_ops->mask_one(cpu); 149 } 150 151 void smp_resched_interrupt(void) 152 { 153 irq_enter(); 154 scheduler_ipi(); 155 local_cpu_data().irq_resched_count++; 156 irq_exit(); 157 /* re-schedule routine called by interrupt return code. */ 158 } 159 160 void smp_call_function_single_interrupt(void) 161 { 162 irq_enter(); 163 generic_smp_call_function_single_interrupt(); 164 local_cpu_data().irq_call_count++; 165 irq_exit(); 166 } 167 168 void smp_call_function_interrupt(void) 169 { 170 irq_enter(); 171 generic_smp_call_function_interrupt(); 172 local_cpu_data().irq_call_count++; 173 irq_exit(); 174 } 175 176 int setup_profiling_timer(unsigned int multiplier) 177 { 178 return -EINVAL; 179 } 180 181 void __init smp_prepare_cpus(unsigned int max_cpus) 182 { 183 extern void __init smp4m_boot_cpus(void); 184 extern void __init smp4d_boot_cpus(void); 185 int i, cpuid, extra; 186 187 printk("Entering SMP Mode...\n"); 188 189 extra = 0; 190 for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { 191 if (cpuid >= NR_CPUS) 192 extra++; 193 } 194 /* i = number of cpus */ 195 if (extra && max_cpus > i - extra) 196 printk("Warning: NR_CPUS is too low to start all cpus\n"); 197 198 smp_store_cpu_info(boot_cpu_id); 199 200 switch(sparc_cpu_model) { 201 case sun4m: 202 smp4m_boot_cpus(); 203 break; 204 case sun4d: 205 smp4d_boot_cpus(); 206 break; 207 case sparc_leon: 208 leon_boot_cpus(); 209 break; 210 case sun4e: 211 printk("SUN4E\n"); 212 BUG(); 213 break; 214 case sun4u: 215 printk("SUN4U\n"); 216 BUG(); 217 break; 218 default: 219 printk("UNKNOWN!\n"); 220 BUG(); 221 break; 222 } 223 } 224 225 /* Set this up early so that things like the scheduler can init 226 * properly. We use the same cpu mask for both the present and 227 * possible cpu map. 228 */ 229 void __init smp_setup_cpu_possible_map(void) 230 { 231 int instance, mid; 232 233 instance = 0; 234 while (!cpu_find_by_instance(instance, NULL, &mid)) { 235 if (mid < NR_CPUS) { 236 set_cpu_possible(mid, true); 237 set_cpu_present(mid, true); 238 } 239 instance++; 240 } 241 } 242 243 void __init smp_prepare_boot_cpu(void) 244 { 245 int cpuid = hard_smp_processor_id(); 246 247 if (cpuid >= NR_CPUS) { 248 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); 249 prom_halt(); 250 } 251 if (cpuid != 0) 252 printk("boot cpu id != 0, this could work but is untested\n"); 253 254 current_thread_info()->cpu = cpuid; 255 set_cpu_online(cpuid, true); 256 set_cpu_possible(cpuid, true); 257 } 258 259 int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle) 260 { 261 extern int __cpuinit smp4m_boot_one_cpu(int, struct task_struct *); 262 extern int __cpuinit smp4d_boot_one_cpu(int, struct task_struct *); 263 int ret=0; 264 265 switch(sparc_cpu_model) { 266 case sun4m: 267 ret = smp4m_boot_one_cpu(cpu, tidle); 268 break; 269 case sun4d: 270 ret = smp4d_boot_one_cpu(cpu, tidle); 271 break; 272 case sparc_leon: 273 ret = leon_boot_one_cpu(cpu, tidle); 274 break; 275 case sun4e: 276 printk("SUN4E\n"); 277 BUG(); 278 break; 279 case sun4u: 280 printk("SUN4U\n"); 281 BUG(); 282 break; 283 default: 284 printk("UNKNOWN!\n"); 285 BUG(); 286 break; 287 } 288 289 if (!ret) { 290 cpumask_set_cpu(cpu, &smp_commenced_mask); 291 while (!cpu_online(cpu)) 292 mb(); 293 } 294 return ret; 295 } 296 297 void smp_bogo(struct seq_file *m) 298 { 299 int i; 300 301 for_each_online_cpu(i) { 302 seq_printf(m, 303 "Cpu%dBogo\t: %lu.%02lu\n", 304 i, 305 cpu_data(i).udelay_val/(500000/HZ), 306 (cpu_data(i).udelay_val/(5000/HZ))%100); 307 } 308 } 309 310 void smp_info(struct seq_file *m) 311 { 312 int i; 313 314 seq_printf(m, "State:\n"); 315 for_each_online_cpu(i) 316 seq_printf(m, "CPU%d\t\t: online\n", i); 317 } 318