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