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 <asm/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 36int smp_num_cpus = 1; 37volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,}; 38unsigned char boot_cpu_id = 0; 39unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */ 40int smp_activated = 0; 41volatile int __cpu_number_map[NR_CPUS]; 42volatile int __cpu_logical_map[NR_CPUS]; 43 44cpumask_t cpu_online_map = CPU_MASK_NONE; 45cpumask_t phys_cpu_present_map = CPU_MASK_NONE; 46cpumask_t smp_commenced_mask = CPU_MASK_NONE; 47 48/* The only guaranteed locking primitive available on all Sparc 49 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically 50 * places the current byte at the effective address into dest_reg and 51 * places 0xff there afterwards. Pretty lame locking primitive 52 * compared to the Alpha and the Intel no? Most Sparcs have 'swap' 53 * instruction which is much better... 54 */ 55 56/* Used to make bitops atomic */ 57unsigned char bitops_spinlock = 0; 58 59void __cpuinit smp_store_cpu_info(int id) 60{ 61 int cpu_node; 62 63 cpu_data(id).udelay_val = loops_per_jiffy; 64 65 cpu_find_by_mid(id, &cpu_node); 66 cpu_data(id).clock_tick = prom_getintdefault(cpu_node, 67 "clock-frequency", 0); 68 cpu_data(id).prom_node = cpu_node; 69 cpu_data(id).mid = cpu_get_hwmid(cpu_node); 70 71 if (cpu_data(id).mid < 0) 72 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node); 73} 74 75void __init smp_cpus_done(unsigned int max_cpus) 76{ 77 extern void smp4m_smp_done(void); 78 extern void smp4d_smp_done(void); 79 unsigned long bogosum = 0; 80 int cpu, num; 81 82 for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++) 83 if (cpu_online(cpu)) { 84 num++; 85 bogosum += cpu_data(cpu).udelay_val; 86 } 87 88 printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 89 num, bogosum/(500000/HZ), 90 (bogosum/(5000/HZ))%100); 91 92 switch(sparc_cpu_model) { 93 case sun4: 94 printk("SUN4\n"); 95 BUG(); 96 break; 97 case sun4c: 98 printk("SUN4C\n"); 99 BUG(); 100 break; 101 case sun4m: 102 smp4m_smp_done(); 103 break; 104 case sun4d: 105 smp4d_smp_done(); 106 break; 107 case sun4e: 108 printk("SUN4E\n"); 109 BUG(); 110 break; 111 case sun4u: 112 printk("SUN4U\n"); 113 BUG(); 114 break; 115 default: 116 printk("UNKNOWN!\n"); 117 BUG(); 118 break; 119 }; 120} 121 122void cpu_panic(void) 123{ 124 printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); 125 panic("SMP bolixed\n"); 126} 127 128struct linux_prom_registers smp_penguin_ctable __initdata = { 0 }; 129 130void smp_send_reschedule(int cpu) 131{ 132 /* See sparc64 */ 133} 134 135void smp_send_stop(void) 136{ 137} 138 139void smp_flush_cache_all(void) 140{ 141 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all)); 142 local_flush_cache_all(); 143} 144 145void smp_flush_tlb_all(void) 146{ 147 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all)); 148 local_flush_tlb_all(); 149} 150 151void smp_flush_cache_mm(struct mm_struct *mm) 152{ 153 if(mm->context != NO_CONTEXT) { 154 cpumask_t cpu_mask = mm->cpu_vm_mask; 155 cpu_clear(smp_processor_id(), cpu_mask); 156 if (!cpus_empty(cpu_mask)) 157 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm); 158 local_flush_cache_mm(mm); 159 } 160} 161 162void smp_flush_tlb_mm(struct mm_struct *mm) 163{ 164 if(mm->context != NO_CONTEXT) { 165 cpumask_t cpu_mask = mm->cpu_vm_mask; 166 cpu_clear(smp_processor_id(), cpu_mask); 167 if (!cpus_empty(cpu_mask)) { 168 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm); 169 if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) 170 mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id()); 171 } 172 local_flush_tlb_mm(mm); 173 } 174} 175 176void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start, 177 unsigned long end) 178{ 179 struct mm_struct *mm = vma->vm_mm; 180 181 if (mm->context != NO_CONTEXT) { 182 cpumask_t cpu_mask = mm->cpu_vm_mask; 183 cpu_clear(smp_processor_id(), cpu_mask); 184 if (!cpus_empty(cpu_mask)) 185 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end); 186 local_flush_cache_range(vma, start, end); 187 } 188} 189 190void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 191 unsigned long end) 192{ 193 struct mm_struct *mm = vma->vm_mm; 194 195 if (mm->context != NO_CONTEXT) { 196 cpumask_t cpu_mask = mm->cpu_vm_mask; 197 cpu_clear(smp_processor_id(), cpu_mask); 198 if (!cpus_empty(cpu_mask)) 199 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end); 200 local_flush_tlb_range(vma, start, end); 201 } 202} 203 204void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) 205{ 206 struct mm_struct *mm = vma->vm_mm; 207 208 if(mm->context != NO_CONTEXT) { 209 cpumask_t cpu_mask = mm->cpu_vm_mask; 210 cpu_clear(smp_processor_id(), cpu_mask); 211 if (!cpus_empty(cpu_mask)) 212 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page); 213 local_flush_cache_page(vma, page); 214 } 215} 216 217void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) 218{ 219 struct mm_struct *mm = vma->vm_mm; 220 221 if(mm->context != NO_CONTEXT) { 222 cpumask_t cpu_mask = mm->cpu_vm_mask; 223 cpu_clear(smp_processor_id(), cpu_mask); 224 if (!cpus_empty(cpu_mask)) 225 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page); 226 local_flush_tlb_page(vma, page); 227 } 228} 229 230void smp_reschedule_irq(void) 231{ 232 set_need_resched(); 233} 234 235void smp_flush_page_to_ram(unsigned long page) 236{ 237 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page); 238 local_flush_page_to_ram(page); 239} 240 241void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) 242{ 243 cpumask_t cpu_mask = mm->cpu_vm_mask; 244 cpu_clear(smp_processor_id(), cpu_mask); 245 if (!cpus_empty(cpu_mask)) 246 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr); 247 local_flush_sig_insns(mm, insn_addr); 248} 249 250extern unsigned int lvl14_resolution; 251 252/* /proc/profile writes can call this, don't __init it please. */ 253static DEFINE_SPINLOCK(prof_setup_lock); 254 255int setup_profiling_timer(unsigned int multiplier) 256{ 257 int i; 258 unsigned long flags; 259 260 /* Prevent level14 ticker IRQ flooding. */ 261 if((!multiplier) || (lvl14_resolution / multiplier) < 500) 262 return -EINVAL; 263 264 spin_lock_irqsave(&prof_setup_lock, flags); 265 for_each_possible_cpu(i) { 266 load_profile_irq(i, lvl14_resolution / multiplier); 267 prof_multiplier(i) = multiplier; 268 } 269 spin_unlock_irqrestore(&prof_setup_lock, flags); 270 271 return 0; 272} 273 274void __init smp_prepare_cpus(unsigned int max_cpus) 275{ 276 extern void __init smp4m_boot_cpus(void); 277 extern void __init smp4d_boot_cpus(void); 278 int i, cpuid, extra; 279 280 printk("Entering SMP Mode...\n"); 281 282 extra = 0; 283 for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { 284 if (cpuid >= NR_CPUS) 285 extra++; 286 } 287 /* i = number of cpus */ 288 if (extra && max_cpus > i - extra) 289 printk("Warning: NR_CPUS is too low to start all cpus\n"); 290 291 smp_store_cpu_info(boot_cpu_id); 292 293 switch(sparc_cpu_model) { 294 case sun4: 295 printk("SUN4\n"); 296 BUG(); 297 break; 298 case sun4c: 299 printk("SUN4C\n"); 300 BUG(); 301 break; 302 case sun4m: 303 smp4m_boot_cpus(); 304 break; 305 case sun4d: 306 smp4d_boot_cpus(); 307 break; 308 case sun4e: 309 printk("SUN4E\n"); 310 BUG(); 311 break; 312 case sun4u: 313 printk("SUN4U\n"); 314 BUG(); 315 break; 316 default: 317 printk("UNKNOWN!\n"); 318 BUG(); 319 break; 320 }; 321} 322 323/* Set this up early so that things like the scheduler can init 324 * properly. We use the same cpu mask for both the present and 325 * possible cpu map. 326 */ 327void __init smp_setup_cpu_possible_map(void) 328{ 329 int instance, mid; 330 331 instance = 0; 332 while (!cpu_find_by_instance(instance, NULL, &mid)) { 333 if (mid < NR_CPUS) { 334 cpu_set(mid, phys_cpu_present_map); 335 cpu_set(mid, cpu_present_map); 336 } 337 instance++; 338 } 339} 340 341void __init smp_prepare_boot_cpu(void) 342{ 343 int cpuid = hard_smp_processor_id(); 344 345 if (cpuid >= NR_CPUS) { 346 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); 347 prom_halt(); 348 } 349 if (cpuid != 0) 350 printk("boot cpu id != 0, this could work but is untested\n"); 351 352 current_thread_info()->cpu = cpuid; 353 cpu_set(cpuid, cpu_online_map); 354 cpu_set(cpuid, phys_cpu_present_map); 355} 356 357int __cpuinit __cpu_up(unsigned int cpu) 358{ 359 extern int __cpuinit smp4m_boot_one_cpu(int); 360 extern int __cpuinit smp4d_boot_one_cpu(int); 361 int ret=0; 362 363 switch(sparc_cpu_model) { 364 case sun4: 365 printk("SUN4\n"); 366 BUG(); 367 break; 368 case sun4c: 369 printk("SUN4C\n"); 370 BUG(); 371 break; 372 case sun4m: 373 ret = smp4m_boot_one_cpu(cpu); 374 break; 375 case sun4d: 376 ret = smp4d_boot_one_cpu(cpu); 377 break; 378 case sun4e: 379 printk("SUN4E\n"); 380 BUG(); 381 break; 382 case sun4u: 383 printk("SUN4U\n"); 384 BUG(); 385 break; 386 default: 387 printk("UNKNOWN!\n"); 388 BUG(); 389 break; 390 }; 391 392 if (!ret) { 393 cpu_set(cpu, smp_commenced_mask); 394 while (!cpu_online(cpu)) 395 mb(); 396 } 397 return ret; 398} 399 400void smp_bogo(struct seq_file *m) 401{ 402 int i; 403 404 for_each_online_cpu(i) { 405 seq_printf(m, 406 "Cpu%dBogo\t: %lu.%02lu\n", 407 i, 408 cpu_data(i).udelay_val/(500000/HZ), 409 (cpu_data(i).udelay_val/(5000/HZ))%100); 410 } 411} 412 413void smp_info(struct seq_file *m) 414{ 415 int i; 416 417 seq_printf(m, "State:\n"); 418 for_each_online_cpu(i) 419 seq_printf(m, "CPU%d\t\t: online\n", i); 420} 421