1 /* leon_smp.c: Sparc-Leon SMP support. 2 * 3 * based on sun4m_smp.c 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB 6 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB 7 */ 8 9 #include <asm/head.h> 10 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/threads.h> 14 #include <linux/smp.h> 15 #include <linux/interrupt.h> 16 #include <linux/kernel_stat.h> 17 #include <linux/of.h> 18 #include <linux/init.h> 19 #include <linux/spinlock.h> 20 #include <linux/mm.h> 21 #include <linux/swap.h> 22 #include <linux/profile.h> 23 #include <linux/pm.h> 24 #include <linux/delay.h> 25 #include <linux/gfp.h> 26 #include <linux/cpu.h> 27 28 #include <asm/cacheflush.h> 29 #include <asm/tlbflush.h> 30 31 #include <asm/ptrace.h> 32 #include <linux/atomic.h> 33 #include <asm/irq_regs.h> 34 #include <asm/traps.h> 35 36 #include <asm/delay.h> 37 #include <asm/irq.h> 38 #include <asm/page.h> 39 #include <asm/pgalloc.h> 40 #include <asm/pgtable.h> 41 #include <asm/oplib.h> 42 #include <asm/cpudata.h> 43 #include <asm/asi.h> 44 #include <asm/leon.h> 45 #include <asm/leon_amba.h> 46 47 #include "kernel.h" 48 49 #ifdef CONFIG_SPARC_LEON 50 51 #include "irq.h" 52 53 extern ctxd_t *srmmu_ctx_table_phys; 54 static int smp_processors_ready; 55 extern volatile unsigned long cpu_callin_map[NR_CPUS]; 56 extern cpumask_t smp_commenced_mask; 57 void __init leon_configure_cache_smp(void); 58 static void leon_ipi_init(void); 59 60 /* IRQ number of LEON IPIs */ 61 int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT; 62 63 static inline unsigned long do_swap(volatile unsigned long *ptr, 64 unsigned long val) 65 { 66 __asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val) 67 : "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS) 68 : "memory"); 69 return val; 70 } 71 72 static void smp_setup_percpu_timer(void); 73 74 void __cpuinit leon_callin(void) 75 { 76 int cpuid = hard_smpleon_processor_id(); 77 78 local_flush_cache_all(); 79 local_flush_tlb_all(); 80 leon_configure_cache_smp(); 81 82 notify_cpu_starting(cpuid); 83 84 /* Get our local ticker going. */ 85 smp_setup_percpu_timer(); 86 87 calibrate_delay(); 88 smp_store_cpu_info(cpuid); 89 90 local_flush_cache_all(); 91 local_flush_tlb_all(); 92 93 /* 94 * Unblock the master CPU _only_ when the scheduler state 95 * of all secondary CPUs will be up-to-date, so after 96 * the SMP initialization the master will be just allowed 97 * to call the scheduler code. 98 * Allow master to continue. 99 */ 100 do_swap(&cpu_callin_map[cpuid], 1); 101 102 local_flush_cache_all(); 103 local_flush_tlb_all(); 104 105 /* Fix idle thread fields. */ 106 __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid]) 107 : "memory" /* paranoid */); 108 109 /* Attach to the address space of init_task. */ 110 atomic_inc(&init_mm.mm_count); 111 current->active_mm = &init_mm; 112 113 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) 114 mb(); 115 116 local_irq_enable(); 117 set_cpu_online(cpuid, true); 118 } 119 120 /* 121 * Cycle through the processors asking the PROM to start each one. 122 */ 123 124 extern struct linux_prom_registers smp_penguin_ctable; 125 126 void __init leon_configure_cache_smp(void) 127 { 128 unsigned long cfg = sparc_leon3_get_dcachecfg(); 129 int me = smp_processor_id(); 130 131 if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) { 132 printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n", 133 (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg), 134 (unsigned int)cfg, (unsigned int)me); 135 sparc_leon3_disable_cache(); 136 } else { 137 if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) { 138 sparc_leon3_enable_snooping(); 139 } else { 140 printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n", 141 me); 142 sparc_leon3_disable_cache(); 143 } 144 } 145 146 local_flush_cache_all(); 147 local_flush_tlb_all(); 148 } 149 150 void leon_smp_setbroadcast(unsigned int mask) 151 { 152 int broadcast = 153 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> 154 LEON3_IRQMPSTATUS_BROADCAST) & 1); 155 if (!broadcast) { 156 prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n", 157 leon_smp_nrcpus()); 158 if (leon_smp_nrcpus() > 1) { 159 BUG(); 160 } else { 161 prom_printf("continue anyway\n"); 162 return; 163 } 164 } 165 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask); 166 } 167 168 unsigned int leon_smp_getbroadcast(void) 169 { 170 unsigned int mask; 171 mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast)); 172 return mask; 173 } 174 175 int leon_smp_nrcpus(void) 176 { 177 int nrcpu = 178 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> 179 LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1; 180 return nrcpu; 181 } 182 183 void __init leon_boot_cpus(void) 184 { 185 int nrcpu = leon_smp_nrcpus(); 186 int me = smp_processor_id(); 187 188 /* Setup IPI */ 189 leon_ipi_init(); 190 191 printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me, 192 (unsigned int)nrcpu, (unsigned int)NR_CPUS, 193 (unsigned int)&(leon3_irqctrl_regs->mpstatus)); 194 195 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me); 196 leon_enable_irq_cpu(LEON3_IRQ_TICKER, me); 197 leon_enable_irq_cpu(leon_ipi_irq, me); 198 199 leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER); 200 201 leon_configure_cache_smp(); 202 smp_setup_percpu_timer(); 203 local_flush_cache_all(); 204 205 } 206 207 int __cpuinit leon_boot_one_cpu(int i) 208 { 209 210 struct task_struct *p; 211 int timeout; 212 213 /* Cook up an idler for this guy. */ 214 p = fork_idle(i); 215 216 current_set[i] = task_thread_info(p); 217 218 /* See trampoline.S:leon_smp_cpu_startup for details... 219 * Initialize the contexts table 220 * Since the call to prom_startcpu() trashes the structure, 221 * we need to re-initialize it for each cpu 222 */ 223 smp_penguin_ctable.which_io = 0; 224 smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys; 225 smp_penguin_ctable.reg_size = 0; 226 227 /* whirrr, whirrr, whirrrrrrrrr... */ 228 printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i, 229 (unsigned int)&leon3_irqctrl_regs->mpstatus); 230 local_flush_cache_all(); 231 232 /* Make sure all IRQs are of from the start for this new CPU */ 233 LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0); 234 235 /* Wake one CPU */ 236 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i); 237 238 /* wheee... it's going... */ 239 for (timeout = 0; timeout < 10000; timeout++) { 240 if (cpu_callin_map[i]) 241 break; 242 udelay(200); 243 } 244 printk(KERN_INFO "Started CPU %d\n", (unsigned int)i); 245 246 if (!(cpu_callin_map[i])) { 247 printk(KERN_ERR "Processor %d is stuck.\n", i); 248 return -ENODEV; 249 } else { 250 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i); 251 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i); 252 leon_enable_irq_cpu(leon_ipi_irq, i); 253 } 254 255 local_flush_cache_all(); 256 return 0; 257 } 258 259 void __init leon_smp_done(void) 260 { 261 262 int i, first; 263 int *prev; 264 265 /* setup cpu list for irq rotation */ 266 first = 0; 267 prev = &first; 268 for (i = 0; i < NR_CPUS; i++) { 269 if (cpu_online(i)) { 270 *prev = i; 271 prev = &cpu_data(i).next; 272 } 273 } 274 *prev = first; 275 local_flush_cache_all(); 276 277 /* Free unneeded trap tables */ 278 if (!cpu_present(1)) { 279 ClearPageReserved(virt_to_page(&trapbase_cpu1)); 280 init_page_count(virt_to_page(&trapbase_cpu1)); 281 free_page((unsigned long)&trapbase_cpu1); 282 totalram_pages++; 283 num_physpages++; 284 } 285 if (!cpu_present(2)) { 286 ClearPageReserved(virt_to_page(&trapbase_cpu2)); 287 init_page_count(virt_to_page(&trapbase_cpu2)); 288 free_page((unsigned long)&trapbase_cpu2); 289 totalram_pages++; 290 num_physpages++; 291 } 292 if (!cpu_present(3)) { 293 ClearPageReserved(virt_to_page(&trapbase_cpu3)); 294 init_page_count(virt_to_page(&trapbase_cpu3)); 295 free_page((unsigned long)&trapbase_cpu3); 296 totalram_pages++; 297 num_physpages++; 298 } 299 /* Ok, they are spinning and ready to go. */ 300 smp_processors_ready = 1; 301 302 } 303 304 void leon_irq_rotate(int cpu) 305 { 306 } 307 308 struct leon_ipi_work { 309 int single; 310 int msk; 311 int resched; 312 }; 313 314 static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work); 315 316 /* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ 317 * is used for all three types of IPIs. 318 */ 319 static void __init leon_ipi_init(void) 320 { 321 int cpu, len; 322 struct leon_ipi_work *work; 323 struct property *pp; 324 struct device_node *rootnp; 325 struct tt_entry *trap_table; 326 unsigned long flags; 327 328 /* Find IPI IRQ or stick with default value */ 329 rootnp = of_find_node_by_path("/ambapp0"); 330 if (rootnp) { 331 pp = of_find_property(rootnp, "ipi_num", &len); 332 if (pp && (*(int *)pp->value)) 333 leon_ipi_irq = *(int *)pp->value; 334 } 335 printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq); 336 337 /* Adjust so that we jump directly to smpleon_ipi */ 338 local_irq_save(flags); 339 trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)]; 340 trap_table->inst_three += smpleon_ipi - real_irq_entry; 341 local_flush_cache_all(); 342 local_irq_restore(flags); 343 344 for_each_possible_cpu(cpu) { 345 work = &per_cpu(leon_ipi_work, cpu); 346 work->single = work->msk = work->resched = 0; 347 } 348 } 349 350 static void leon_ipi_single(int cpu) 351 { 352 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); 353 354 /* Mark work */ 355 work->single = 1; 356 357 /* Generate IRQ on the CPU */ 358 set_cpu_int(cpu, leon_ipi_irq); 359 } 360 361 static void leon_ipi_mask_one(int cpu) 362 { 363 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); 364 365 /* Mark work */ 366 work->msk = 1; 367 368 /* Generate IRQ on the CPU */ 369 set_cpu_int(cpu, leon_ipi_irq); 370 } 371 372 static void leon_ipi_resched(int cpu) 373 { 374 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); 375 376 /* Mark work */ 377 work->resched = 1; 378 379 /* Generate IRQ on the CPU (any IRQ will cause resched) */ 380 set_cpu_int(cpu, leon_ipi_irq); 381 } 382 383 void leonsmp_ipi_interrupt(void) 384 { 385 struct leon_ipi_work *work = &__get_cpu_var(leon_ipi_work); 386 387 if (work->single) { 388 work->single = 0; 389 smp_call_function_single_interrupt(); 390 } 391 if (work->msk) { 392 work->msk = 0; 393 smp_call_function_interrupt(); 394 } 395 if (work->resched) { 396 work->resched = 0; 397 smp_resched_interrupt(); 398 } 399 } 400 401 static struct smp_funcall { 402 smpfunc_t func; 403 unsigned long arg1; 404 unsigned long arg2; 405 unsigned long arg3; 406 unsigned long arg4; 407 unsigned long arg5; 408 unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */ 409 unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */ 410 } ccall_info; 411 412 static DEFINE_SPINLOCK(cross_call_lock); 413 414 /* Cross calls must be serialized, at least currently. */ 415 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, 416 unsigned long arg2, unsigned long arg3, 417 unsigned long arg4) 418 { 419 if (smp_processors_ready) { 420 register int high = NR_CPUS - 1; 421 unsigned long flags; 422 423 spin_lock_irqsave(&cross_call_lock, flags); 424 425 { 426 /* If you make changes here, make sure gcc generates proper code... */ 427 register smpfunc_t f asm("i0") = func; 428 register unsigned long a1 asm("i1") = arg1; 429 register unsigned long a2 asm("i2") = arg2; 430 register unsigned long a3 asm("i3") = arg3; 431 register unsigned long a4 asm("i4") = arg4; 432 register unsigned long a5 asm("i5") = 0; 433 434 __asm__ __volatile__("std %0, [%6]\n\t" 435 "std %2, [%6 + 8]\n\t" 436 "std %4, [%6 + 16]\n\t" : : 437 "r"(f), "r"(a1), "r"(a2), "r"(a3), 438 "r"(a4), "r"(a5), 439 "r"(&ccall_info.func)); 440 } 441 442 /* Init receive/complete mapping, plus fire the IPI's off. */ 443 { 444 register int i; 445 446 cpumask_clear_cpu(smp_processor_id(), &mask); 447 cpumask_and(&mask, cpu_online_mask, &mask); 448 for (i = 0; i <= high; i++) { 449 if (cpumask_test_cpu(i, &mask)) { 450 ccall_info.processors_in[i] = 0; 451 ccall_info.processors_out[i] = 0; 452 set_cpu_int(i, LEON3_IRQ_CROSS_CALL); 453 454 } 455 } 456 } 457 458 { 459 register int i; 460 461 i = 0; 462 do { 463 if (!cpumask_test_cpu(i, &mask)) 464 continue; 465 466 while (!ccall_info.processors_in[i]) 467 barrier(); 468 } while (++i <= high); 469 470 i = 0; 471 do { 472 if (!cpumask_test_cpu(i, &mask)) 473 continue; 474 475 while (!ccall_info.processors_out[i]) 476 barrier(); 477 } while (++i <= high); 478 } 479 480 spin_unlock_irqrestore(&cross_call_lock, flags); 481 } 482 } 483 484 /* Running cross calls. */ 485 void leon_cross_call_irq(void) 486 { 487 int i = smp_processor_id(); 488 489 ccall_info.processors_in[i] = 1; 490 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, 491 ccall_info.arg4, ccall_info.arg5); 492 ccall_info.processors_out[i] = 1; 493 } 494 495 irqreturn_t leon_percpu_timer_interrupt(int irq, void *unused) 496 { 497 int cpu = smp_processor_id(); 498 499 leon_clear_profile_irq(cpu); 500 501 profile_tick(CPU_PROFILING); 502 503 if (!--prof_counter(cpu)) { 504 int user = user_mode(get_irq_regs()); 505 506 update_process_times(user); 507 508 prof_counter(cpu) = prof_multiplier(cpu); 509 } 510 511 return IRQ_HANDLED; 512 } 513 514 static void __init smp_setup_percpu_timer(void) 515 { 516 int cpu = smp_processor_id(); 517 518 prof_counter(cpu) = prof_multiplier(cpu) = 1; 519 } 520 521 void __init leon_blackbox_id(unsigned *addr) 522 { 523 int rd = *addr & 0x3e000000; 524 int rs1 = rd >> 11; 525 526 /* patch places where ___b_hard_smp_processor_id appears */ 527 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */ 528 addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */ 529 addr[2] = 0x01000000; /* nop */ 530 } 531 532 void __init leon_blackbox_current(unsigned *addr) 533 { 534 int rd = *addr & 0x3e000000; 535 int rs1 = rd >> 11; 536 537 /* patch LOAD_CURRENT macro where ___b_load_current appears */ 538 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */ 539 addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */ 540 addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */ 541 542 } 543 544 void __init leon_init_smp(void) 545 { 546 /* Patch ipi15 trap table */ 547 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m); 548 549 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id); 550 BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current); 551 BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM); 552 BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id, 553 BTFIXUPCALL_NORM); 554 BTFIXUPSET_CALL(smp_ipi_resched, leon_ipi_resched, BTFIXUPCALL_NORM); 555 BTFIXUPSET_CALL(smp_ipi_single, leon_ipi_single, BTFIXUPCALL_NORM); 556 BTFIXUPSET_CALL(smp_ipi_mask_one, leon_ipi_mask_one, BTFIXUPCALL_NORM); 557 } 558 559 #endif /* CONFIG_SPARC_LEON */ 560