Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/smp_lock.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/kernel_stat.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/seq_file.h> |
| 22 | #include <linux/cache.h> |
| 23 | #include <linux/delay.h> |
| 24 | |
| 25 | #include <asm/ptrace.h> |
| 26 | #include <asm/atomic.h> |
| 27 | |
| 28 | #include <asm/irq.h> |
| 29 | #include <asm/page.h> |
| 30 | #include <asm/pgalloc.h> |
| 31 | #include <asm/pgtable.h> |
| 32 | #include <asm/oplib.h> |
| 33 | #include <asm/cacheflush.h> |
| 34 | #include <asm/tlbflush.h> |
| 35 | #include <asm/cpudata.h> |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | int smp_num_cpus = 1; |
| 38 | volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,}; |
| 39 | unsigned char boot_cpu_id = 0; |
| 40 | unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */ |
| 41 | int smp_activated = 0; |
| 42 | volatile int __cpu_number_map[NR_CPUS]; |
| 43 | volatile int __cpu_logical_map[NR_CPUS]; |
| 44 | |
| 45 | cpumask_t cpu_online_map = CPU_MASK_NONE; |
| 46 | cpumask_t phys_cpu_present_map = CPU_MASK_NONE; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 47 | cpumask_t smp_commenced_mask = CPU_MASK_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | /* The only guaranteed locking primitive available on all Sparc |
| 50 | * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically |
| 51 | * places the current byte at the effective address into dest_reg and |
| 52 | * places 0xff there afterwards. Pretty lame locking primitive |
| 53 | * compared to the Alpha and the Intel no? Most Sparcs have 'swap' |
| 54 | * instruction which is much better... |
| 55 | */ |
| 56 | |
| 57 | /* Used to make bitops atomic */ |
| 58 | unsigned char bitops_spinlock = 0; |
| 59 | |
Bob Breuer | 92d452f | 2006-06-20 00:36:10 -0700 | [diff] [blame] | 60 | void __cpuinit smp_store_cpu_info(int id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
| 62 | int cpu_node; |
| 63 | |
| 64 | cpu_data(id).udelay_val = loops_per_jiffy; |
| 65 | |
| 66 | cpu_find_by_mid(id, &cpu_node); |
| 67 | cpu_data(id).clock_tick = prom_getintdefault(cpu_node, |
| 68 | "clock-frequency", 0); |
| 69 | cpu_data(id).prom_node = cpu_node; |
| 70 | cpu_data(id).mid = cpu_get_hwmid(cpu_node); |
Krzysztof Helt | 650fb83 | 2006-06-10 22:03:43 -0700 | [diff] [blame] | 71 | |
| 72 | /* this is required to tune the scheduler correctly */ |
| 73 | /* is it possible to have CPUs with different cache sizes? */ |
| 74 | if (id == boot_cpu_id) { |
| 75 | int cache_line,cache_nlines; |
| 76 | cache_line = 0x20; |
| 77 | cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line); |
| 78 | cache_nlines = 0x8000; |
| 79 | cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines); |
| 80 | max_cache_size = cache_line * cache_nlines; |
| 81 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | if (cpu_data(id).mid < 0) |
| 83 | panic("No MID found for CPU%d at node 0x%08d", id, cpu_node); |
| 84 | } |
| 85 | |
| 86 | void __init smp_cpus_done(unsigned int max_cpus) |
| 87 | { |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 88 | extern void smp4m_smp_done(void); |
Raymond Burns | 8b3c848 | 2006-07-17 21:57:09 -0700 | [diff] [blame] | 89 | extern void smp4d_smp_done(void); |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 90 | unsigned long bogosum = 0; |
| 91 | int cpu, num; |
| 92 | |
| 93 | for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++) |
| 94 | if (cpu_online(cpu)) { |
| 95 | num++; |
| 96 | bogosum += cpu_data(cpu).udelay_val; |
| 97 | } |
| 98 | |
| 99 | printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", |
| 100 | num, bogosum/(500000/HZ), |
| 101 | (bogosum/(5000/HZ))%100); |
| 102 | |
Raymond Burns | 8b3c848 | 2006-07-17 21:57:09 -0700 | [diff] [blame] | 103 | switch(sparc_cpu_model) { |
| 104 | case sun4: |
| 105 | printk("SUN4\n"); |
| 106 | BUG(); |
| 107 | break; |
| 108 | case sun4c: |
| 109 | printk("SUN4C\n"); |
| 110 | BUG(); |
| 111 | break; |
| 112 | case sun4m: |
| 113 | smp4m_smp_done(); |
| 114 | break; |
| 115 | case sun4d: |
| 116 | smp4d_smp_done(); |
| 117 | break; |
| 118 | case sun4e: |
| 119 | printk("SUN4E\n"); |
| 120 | BUG(); |
| 121 | break; |
| 122 | case sun4u: |
| 123 | printk("SUN4U\n"); |
| 124 | BUG(); |
| 125 | break; |
| 126 | default: |
| 127 | printk("UNKNOWN!\n"); |
| 128 | BUG(); |
| 129 | break; |
| 130 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | void cpu_panic(void) |
| 134 | { |
| 135 | printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); |
| 136 | panic("SMP bolixed\n"); |
| 137 | } |
| 138 | |
| 139 | struct linux_prom_registers smp_penguin_ctable __initdata = { 0 }; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | void smp_send_reschedule(int cpu) |
| 142 | { |
| 143 | /* See sparc64 */ |
| 144 | } |
| 145 | |
| 146 | void smp_send_stop(void) |
| 147 | { |
| 148 | } |
| 149 | |
| 150 | void smp_flush_cache_all(void) |
| 151 | { |
| 152 | xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all)); |
| 153 | local_flush_cache_all(); |
| 154 | } |
| 155 | |
| 156 | void smp_flush_tlb_all(void) |
| 157 | { |
| 158 | xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all)); |
| 159 | local_flush_tlb_all(); |
| 160 | } |
| 161 | |
| 162 | void smp_flush_cache_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_cache_mm), (unsigned long) mm); |
| 169 | local_flush_cache_mm(mm); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | void smp_flush_tlb_mm(struct mm_struct *mm) |
| 174 | { |
| 175 | if(mm->context != NO_CONTEXT) { |
| 176 | cpumask_t cpu_mask = mm->cpu_vm_mask; |
| 177 | cpu_clear(smp_processor_id(), cpu_mask); |
| 178 | if (!cpus_empty(cpu_mask)) { |
| 179 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm); |
| 180 | if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) |
| 181 | mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id()); |
| 182 | } |
| 183 | local_flush_tlb_mm(mm); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start, |
| 188 | unsigned long end) |
| 189 | { |
| 190 | struct mm_struct *mm = vma->vm_mm; |
| 191 | |
| 192 | if (mm->context != NO_CONTEXT) { |
| 193 | cpumask_t cpu_mask = mm->cpu_vm_mask; |
| 194 | cpu_clear(smp_processor_id(), cpu_mask); |
| 195 | if (!cpus_empty(cpu_mask)) |
| 196 | xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end); |
| 197 | local_flush_cache_range(vma, start, end); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, |
| 202 | unsigned long end) |
| 203 | { |
| 204 | struct mm_struct *mm = vma->vm_mm; |
| 205 | |
| 206 | if (mm->context != NO_CONTEXT) { |
| 207 | cpumask_t cpu_mask = mm->cpu_vm_mask; |
| 208 | cpu_clear(smp_processor_id(), cpu_mask); |
| 209 | if (!cpus_empty(cpu_mask)) |
| 210 | xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end); |
| 211 | local_flush_tlb_range(vma, start, end); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) |
| 216 | { |
| 217 | struct mm_struct *mm = vma->vm_mm; |
| 218 | |
| 219 | if(mm->context != NO_CONTEXT) { |
| 220 | cpumask_t cpu_mask = mm->cpu_vm_mask; |
| 221 | cpu_clear(smp_processor_id(), cpu_mask); |
| 222 | if (!cpus_empty(cpu_mask)) |
| 223 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page); |
| 224 | local_flush_cache_page(vma, page); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) |
| 229 | { |
| 230 | struct mm_struct *mm = vma->vm_mm; |
| 231 | |
| 232 | if(mm->context != NO_CONTEXT) { |
| 233 | cpumask_t cpu_mask = mm->cpu_vm_mask; |
| 234 | cpu_clear(smp_processor_id(), cpu_mask); |
| 235 | if (!cpus_empty(cpu_mask)) |
| 236 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page); |
| 237 | local_flush_tlb_page(vma, page); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | void smp_reschedule_irq(void) |
| 242 | { |
| 243 | set_need_resched(); |
| 244 | } |
| 245 | |
| 246 | void smp_flush_page_to_ram(unsigned long page) |
| 247 | { |
| 248 | /* Current theory is that those who call this are the one's |
| 249 | * who have just dirtied their cache with the pages contents |
| 250 | * in kernel space, therefore we only run this on local cpu. |
| 251 | * |
| 252 | * XXX This experiment failed, research further... -DaveM |
| 253 | */ |
| 254 | #if 1 |
| 255 | xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page); |
| 256 | #endif |
| 257 | local_flush_page_to_ram(page); |
| 258 | } |
| 259 | |
| 260 | void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) |
| 261 | { |
| 262 | cpumask_t cpu_mask = mm->cpu_vm_mask; |
| 263 | cpu_clear(smp_processor_id(), cpu_mask); |
| 264 | if (!cpus_empty(cpu_mask)) |
| 265 | xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr); |
| 266 | local_flush_sig_insns(mm, insn_addr); |
| 267 | } |
| 268 | |
| 269 | extern unsigned int lvl14_resolution; |
| 270 | |
| 271 | /* /proc/profile writes can call this, don't __init it please. */ |
| 272 | static DEFINE_SPINLOCK(prof_setup_lock); |
| 273 | |
| 274 | int setup_profiling_timer(unsigned int multiplier) |
| 275 | { |
| 276 | int i; |
| 277 | unsigned long flags; |
| 278 | |
| 279 | /* Prevent level14 ticker IRQ flooding. */ |
| 280 | if((!multiplier) || (lvl14_resolution / multiplier) < 500) |
| 281 | return -EINVAL; |
| 282 | |
| 283 | spin_lock_irqsave(&prof_setup_lock, flags); |
KAMEZAWA Hiroyuki | fff8efe | 2006-04-10 22:52:51 -0700 | [diff] [blame] | 284 | for_each_possible_cpu(i) { |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 285 | load_profile_irq(i, lvl14_resolution / multiplier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | prof_multiplier(i) = multiplier; |
| 287 | } |
| 288 | spin_unlock_irqrestore(&prof_setup_lock, flags); |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 293 | void __init smp_prepare_cpus(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | { |
Al Viro | b4cff84 | 2007-02-01 13:52:33 +0000 | [diff] [blame^] | 295 | extern void __init smp4m_boot_cpus(void); |
| 296 | extern void __init smp4d_boot_cpus(void); |
Bob Breuer | 7202fb4 | 2006-06-20 00:30:31 -0700 | [diff] [blame] | 297 | int i, cpuid, extra; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 298 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 299 | printk("Entering SMP Mode...\n"); |
| 300 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 301 | extra = 0; |
| 302 | for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { |
Bob Breuer | 7202fb4 | 2006-06-20 00:30:31 -0700 | [diff] [blame] | 303 | if (cpuid >= NR_CPUS) |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 304 | extra++; |
| 305 | } |
Bob Breuer | 7202fb4 | 2006-06-20 00:30:31 -0700 | [diff] [blame] | 306 | /* i = number of cpus */ |
| 307 | if (extra && max_cpus > i - extra) |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 308 | printk("Warning: NR_CPUS is too low to start all cpus\n"); |
| 309 | |
| 310 | smp_store_cpu_info(boot_cpu_id); |
| 311 | |
Raymond Burns | 8b3c848 | 2006-07-17 21:57:09 -0700 | [diff] [blame] | 312 | switch(sparc_cpu_model) { |
| 313 | case sun4: |
| 314 | printk("SUN4\n"); |
| 315 | BUG(); |
| 316 | break; |
| 317 | case sun4c: |
| 318 | printk("SUN4C\n"); |
| 319 | BUG(); |
| 320 | break; |
| 321 | case sun4m: |
| 322 | smp4m_boot_cpus(); |
| 323 | break; |
| 324 | case sun4d: |
| 325 | smp4d_boot_cpus(); |
| 326 | break; |
| 327 | case sun4e: |
| 328 | printk("SUN4E\n"); |
| 329 | BUG(); |
| 330 | break; |
| 331 | case sun4u: |
| 332 | printk("SUN4U\n"); |
| 333 | BUG(); |
| 334 | break; |
| 335 | default: |
| 336 | printk("UNKNOWN!\n"); |
| 337 | BUG(); |
| 338 | break; |
| 339 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
Bob Breuer | 7202fb4 | 2006-06-20 00:30:31 -0700 | [diff] [blame] | 342 | /* Set this up early so that things like the scheduler can init |
| 343 | * properly. We use the same cpu mask for both the present and |
| 344 | * possible cpu map. |
| 345 | */ |
| 346 | void __init smp_setup_cpu_possible_map(void) |
| 347 | { |
| 348 | int instance, mid; |
| 349 | |
| 350 | instance = 0; |
| 351 | while (!cpu_find_by_instance(instance, NULL, &mid)) { |
| 352 | if (mid < NR_CPUS) { |
| 353 | cpu_set(mid, phys_cpu_present_map); |
| 354 | cpu_set(mid, cpu_present_map); |
| 355 | } |
| 356 | instance++; |
| 357 | } |
| 358 | } |
| 359 | |
Bob Breuer | 92d452f | 2006-06-20 00:36:10 -0700 | [diff] [blame] | 360 | void __init smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 362 | int cpuid = hard_smp_processor_id(); |
| 363 | |
| 364 | if (cpuid >= NR_CPUS) { |
| 365 | prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); |
| 366 | prom_halt(); |
| 367 | } |
| 368 | if (cpuid != 0) |
| 369 | printk("boot cpu id != 0, this could work but is untested\n"); |
| 370 | |
| 371 | current_thread_info()->cpu = cpuid; |
| 372 | cpu_set(cpuid, cpu_online_map); |
| 373 | cpu_set(cpuid, phys_cpu_present_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Bob Breuer | 92d452f | 2006-06-20 00:36:10 -0700 | [diff] [blame] | 376 | int __cpuinit __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | { |
Al Viro | b4cff84 | 2007-02-01 13:52:33 +0000 | [diff] [blame^] | 378 | extern int __cpuinit smp4m_boot_one_cpu(int); |
| 379 | extern int __cpuinit smp4d_boot_one_cpu(int); |
Raymond Burns | 8b3c848 | 2006-07-17 21:57:09 -0700 | [diff] [blame] | 380 | int ret=0; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 381 | |
Raymond Burns | 8b3c848 | 2006-07-17 21:57:09 -0700 | [diff] [blame] | 382 | switch(sparc_cpu_model) { |
| 383 | case sun4: |
| 384 | printk("SUN4\n"); |
| 385 | BUG(); |
| 386 | break; |
| 387 | case sun4c: |
| 388 | printk("SUN4C\n"); |
| 389 | BUG(); |
| 390 | break; |
| 391 | case sun4m: |
| 392 | ret = smp4m_boot_one_cpu(cpu); |
| 393 | break; |
| 394 | case sun4d: |
| 395 | ret = smp4d_boot_one_cpu(cpu); |
| 396 | break; |
| 397 | case sun4e: |
| 398 | printk("SUN4E\n"); |
| 399 | BUG(); |
| 400 | break; |
| 401 | case sun4u: |
| 402 | printk("SUN4U\n"); |
| 403 | BUG(); |
| 404 | break; |
| 405 | default: |
| 406 | printk("UNKNOWN!\n"); |
| 407 | BUG(); |
| 408 | break; |
| 409 | }; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 410 | |
| 411 | if (!ret) { |
| 412 | cpu_set(cpu, smp_commenced_mask); |
| 413 | while (!cpu_online(cpu)) |
| 414 | mb(); |
| 415 | } |
| 416 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | void smp_bogo(struct seq_file *m) |
| 420 | { |
| 421 | int i; |
| 422 | |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 423 | for_each_online_cpu(i) { |
| 424 | seq_printf(m, |
| 425 | "Cpu%dBogo\t: %lu.%02lu\n", |
| 426 | i, |
| 427 | cpu_data(i).udelay_val/(500000/HZ), |
| 428 | (cpu_data(i).udelay_val/(5000/HZ))%100); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
| 430 | } |
| 431 | |
| 432 | void smp_info(struct seq_file *m) |
| 433 | { |
| 434 | int i; |
| 435 | |
| 436 | seq_printf(m, "State:\n"); |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 437 | for_each_online_cpu(i) |
| 438 | seq_printf(m, "CPU%d\t\t: online\n", i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |