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 36 #include "irq.h" 37 38 volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,}; 39 unsigned char boot_cpu_id = 0; 40 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */ 41 42 cpumask_t smp_commenced_mask = CPU_MASK_NONE; 43 44 /* The only guaranteed locking primitive available on all Sparc 45 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically 46 * places the current byte at the effective address into dest_reg and 47 * places 0xff there afterwards. Pretty lame locking primitive 48 * compared to the Alpha and the Intel no? Most Sparcs have 'swap' 49 * instruction which is much better... 50 */ 51 52 void __cpuinit smp_store_cpu_info(int id) 53 { 54 int cpu_node; 55 56 cpu_data(id).udelay_val = loops_per_jiffy; 57 58 cpu_find_by_mid(id, &cpu_node); 59 cpu_data(id).clock_tick = prom_getintdefault(cpu_node, 60 "clock-frequency", 0); 61 cpu_data(id).prom_node = cpu_node; 62 cpu_data(id).mid = cpu_get_hwmid(cpu_node); 63 64 if (cpu_data(id).mid < 0) 65 panic("No MID found for CPU%d at node 0x%08d", id, cpu_node); 66 } 67 68 void __init smp_cpus_done(unsigned int max_cpus) 69 { 70 extern void smp4m_smp_done(void); 71 extern void smp4d_smp_done(void); 72 unsigned long bogosum = 0; 73 int cpu, num = 0; 74 75 for_each_online_cpu(cpu) { 76 num++; 77 bogosum += cpu_data(cpu).udelay_val; 78 } 79 80 printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 81 num, bogosum/(500000/HZ), 82 (bogosum/(5000/HZ))%100); 83 84 switch(sparc_cpu_model) { 85 case sun4: 86 printk("SUN4\n"); 87 BUG(); 88 break; 89 case sun4c: 90 printk("SUN4C\n"); 91 BUG(); 92 break; 93 case sun4m: 94 smp4m_smp_done(); 95 break; 96 case sun4d: 97 smp4d_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 /* See sparc64 */ 125 } 126 127 void smp_send_stop(void) 128 { 129 } 130 131 void smp_flush_cache_all(void) 132 { 133 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all)); 134 local_flush_cache_all(); 135 } 136 137 void smp_flush_tlb_all(void) 138 { 139 xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all)); 140 local_flush_tlb_all(); 141 } 142 143 void smp_flush_cache_mm(struct mm_struct *mm) 144 { 145 if(mm->context != NO_CONTEXT) { 146 cpumask_t cpu_mask = *mm_cpumask(mm); 147 cpu_clear(smp_processor_id(), cpu_mask); 148 if (!cpus_empty(cpu_mask)) 149 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm); 150 local_flush_cache_mm(mm); 151 } 152 } 153 154 void smp_flush_tlb_mm(struct mm_struct *mm) 155 { 156 if(mm->context != NO_CONTEXT) { 157 cpumask_t cpu_mask = *mm_cpumask(mm); 158 cpu_clear(smp_processor_id(), cpu_mask); 159 if (!cpus_empty(cpu_mask)) { 160 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm); 161 if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) 162 cpumask_copy(mm_cpumask(mm), 163 cpumask_of(smp_processor_id())); 164 } 165 local_flush_tlb_mm(mm); 166 } 167 } 168 169 void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start, 170 unsigned long end) 171 { 172 struct mm_struct *mm = vma->vm_mm; 173 174 if (mm->context != NO_CONTEXT) { 175 cpumask_t cpu_mask = *mm_cpumask(mm); 176 cpu_clear(smp_processor_id(), cpu_mask); 177 if (!cpus_empty(cpu_mask)) 178 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end); 179 local_flush_cache_range(vma, start, end); 180 } 181 } 182 183 void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 184 unsigned long end) 185 { 186 struct mm_struct *mm = vma->vm_mm; 187 188 if (mm->context != NO_CONTEXT) { 189 cpumask_t cpu_mask = *mm_cpumask(mm); 190 cpu_clear(smp_processor_id(), cpu_mask); 191 if (!cpus_empty(cpu_mask)) 192 xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end); 193 local_flush_tlb_range(vma, start, end); 194 } 195 } 196 197 void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) 198 { 199 struct mm_struct *mm = vma->vm_mm; 200 201 if(mm->context != NO_CONTEXT) { 202 cpumask_t cpu_mask = *mm_cpumask(mm); 203 cpu_clear(smp_processor_id(), cpu_mask); 204 if (!cpus_empty(cpu_mask)) 205 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page); 206 local_flush_cache_page(vma, page); 207 } 208 } 209 210 void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) 211 { 212 struct mm_struct *mm = vma->vm_mm; 213 214 if(mm->context != NO_CONTEXT) { 215 cpumask_t cpu_mask = *mm_cpumask(mm); 216 cpu_clear(smp_processor_id(), cpu_mask); 217 if (!cpus_empty(cpu_mask)) 218 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page); 219 local_flush_tlb_page(vma, page); 220 } 221 } 222 223 void smp_reschedule_irq(void) 224 { 225 set_need_resched(); 226 } 227 228 void smp_flush_page_to_ram(unsigned long page) 229 { 230 /* Current theory is that those who call this are the one's 231 * who have just dirtied their cache with the pages contents 232 * in kernel space, therefore we only run this on local cpu. 233 * 234 * XXX This experiment failed, research further... -DaveM 235 */ 236 #if 1 237 xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page); 238 #endif 239 local_flush_page_to_ram(page); 240 } 241 242 void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) 243 { 244 cpumask_t cpu_mask = *mm_cpumask(mm); 245 cpu_clear(smp_processor_id(), cpu_mask); 246 if (!cpus_empty(cpu_mask)) 247 xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr); 248 local_flush_sig_insns(mm, insn_addr); 249 } 250 251 extern unsigned int lvl14_resolution; 252 253 /* /proc/profile writes can call this, don't __init it please. */ 254 static DEFINE_SPINLOCK(prof_setup_lock); 255 256 int setup_profiling_timer(unsigned int multiplier) 257 { 258 int i; 259 unsigned long flags; 260 261 /* Prevent level14 ticker IRQ flooding. */ 262 if((!multiplier) || (lvl14_resolution / multiplier) < 500) 263 return -EINVAL; 264 265 spin_lock_irqsave(&prof_setup_lock, flags); 266 for_each_possible_cpu(i) { 267 load_profile_irq(i, lvl14_resolution / multiplier); 268 prof_multiplier(i) = multiplier; 269 } 270 spin_unlock_irqrestore(&prof_setup_lock, flags); 271 272 return 0; 273 } 274 275 void __init smp_prepare_cpus(unsigned int max_cpus) 276 { 277 extern void __init smp4m_boot_cpus(void); 278 extern void __init smp4d_boot_cpus(void); 279 int i, cpuid, extra; 280 281 printk("Entering SMP Mode...\n"); 282 283 extra = 0; 284 for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { 285 if (cpuid >= NR_CPUS) 286 extra++; 287 } 288 /* i = number of cpus */ 289 if (extra && max_cpus > i - extra) 290 printk("Warning: NR_CPUS is too low to start all cpus\n"); 291 292 smp_store_cpu_info(boot_cpu_id); 293 294 switch(sparc_cpu_model) { 295 case sun4: 296 printk("SUN4\n"); 297 BUG(); 298 break; 299 case sun4c: 300 printk("SUN4C\n"); 301 BUG(); 302 break; 303 case sun4m: 304 smp4m_boot_cpus(); 305 break; 306 case sun4d: 307 smp4d_boot_cpus(); 308 break; 309 case sun4e: 310 printk("SUN4E\n"); 311 BUG(); 312 break; 313 case sun4u: 314 printk("SUN4U\n"); 315 BUG(); 316 break; 317 default: 318 printk("UNKNOWN!\n"); 319 BUG(); 320 break; 321 }; 322 } 323 324 /* Set this up early so that things like the scheduler can init 325 * properly. We use the same cpu mask for both the present and 326 * possible cpu map. 327 */ 328 void __init smp_setup_cpu_possible_map(void) 329 { 330 int instance, mid; 331 332 instance = 0; 333 while (!cpu_find_by_instance(instance, NULL, &mid)) { 334 if (mid < NR_CPUS) { 335 set_cpu_possible(mid, true); 336 set_cpu_present(mid, true); 337 } 338 instance++; 339 } 340 } 341 342 void __init smp_prepare_boot_cpu(void) 343 { 344 int cpuid = hard_smp_processor_id(); 345 346 if (cpuid >= NR_CPUS) { 347 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); 348 prom_halt(); 349 } 350 if (cpuid != 0) 351 printk("boot cpu id != 0, this could work but is untested\n"); 352 353 current_thread_info()->cpu = cpuid; 354 set_cpu_online(cpuid, true); 355 set_cpu_possible(cpuid, true); 356 } 357 358 int __cpuinit __cpu_up(unsigned int cpu) 359 { 360 extern int __cpuinit smp4m_boot_one_cpu(int); 361 extern int __cpuinit smp4d_boot_one_cpu(int); 362 int ret=0; 363 364 switch(sparc_cpu_model) { 365 case sun4: 366 printk("SUN4\n"); 367 BUG(); 368 break; 369 case sun4c: 370 printk("SUN4C\n"); 371 BUG(); 372 break; 373 case sun4m: 374 ret = smp4m_boot_one_cpu(cpu); 375 break; 376 case sun4d: 377 ret = smp4d_boot_one_cpu(cpu); 378 break; 379 case sun4e: 380 printk("SUN4E\n"); 381 BUG(); 382 break; 383 case sun4u: 384 printk("SUN4U\n"); 385 BUG(); 386 break; 387 default: 388 printk("UNKNOWN!\n"); 389 BUG(); 390 break; 391 }; 392 393 if (!ret) { 394 cpu_set(cpu, smp_commenced_mask); 395 while (!cpu_online(cpu)) 396 mb(); 397 } 398 return ret; 399 } 400 401 void smp_bogo(struct seq_file *m) 402 { 403 int i; 404 405 for_each_online_cpu(i) { 406 seq_printf(m, 407 "Cpu%dBogo\t: %lu.%02lu\n", 408 i, 409 cpu_data(i).udelay_val/(500000/HZ), 410 (cpu_data(i).udelay_val/(5000/HZ))%100); 411 } 412 } 413 414 void smp_info(struct seq_file *m) 415 { 416 int i; 417 418 seq_printf(m, "State:\n"); 419 for_each_online_cpu(i) 420 seq_printf(m, "CPU%d\t\t: online\n", i); 421 } 422