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/smp_lock.h> 16 #include <linux/interrupt.h> 17 #include <linux/kernel_stat.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 26 #include <asm/cacheflush.h> 27 #include <asm/tlbflush.h> 28 29 #include <asm/ptrace.h> 30 #include <asm/atomic.h> 31 #include <asm/irq_regs.h> 32 33 #include <asm/delay.h> 34 #include <asm/irq.h> 35 #include <asm/page.h> 36 #include <asm/pgalloc.h> 37 #include <asm/pgtable.h> 38 #include <asm/oplib.h> 39 #include <asm/cpudata.h> 40 #include <asm/asi.h> 41 #include <asm/leon.h> 42 #include <asm/leon_amba.h> 43 44 #ifdef CONFIG_SPARC_LEON 45 46 #include "irq.h" 47 48 extern ctxd_t *srmmu_ctx_table_phys; 49 static int smp_processors_ready; 50 extern volatile unsigned long cpu_callin_map[NR_CPUS]; 51 extern unsigned char boot_cpu_id; 52 extern cpumask_t smp_commenced_mask; 53 void __init leon_configure_cache_smp(void); 54 55 static inline unsigned long do_swap(volatile unsigned long *ptr, 56 unsigned long val) 57 { 58 __asm__ __volatile__("swapa [%1] %2, %0\n\t" : "=&r"(val) 59 : "r"(ptr), "i"(ASI_LEON_DCACHE_MISS) 60 : "memory"); 61 return val; 62 } 63 64 static void smp_setup_percpu_timer(void); 65 66 void __cpuinit leon_callin(void) 67 { 68 int cpuid = hard_smpleon_processor_id(); 69 70 local_flush_cache_all(); 71 local_flush_tlb_all(); 72 leon_configure_cache_smp(); 73 74 /* Get our local ticker going. */ 75 smp_setup_percpu_timer(); 76 77 calibrate_delay(); 78 smp_store_cpu_info(cpuid); 79 80 local_flush_cache_all(); 81 local_flush_tlb_all(); 82 83 /* 84 * Unblock the master CPU _only_ when the scheduler state 85 * of all secondary CPUs will be up-to-date, so after 86 * the SMP initialization the master will be just allowed 87 * to call the scheduler code. 88 * Allow master to continue. 89 */ 90 do_swap(&cpu_callin_map[cpuid], 1); 91 92 local_flush_cache_all(); 93 local_flush_tlb_all(); 94 95 cpu_probe(); 96 97 /* Fix idle thread fields. */ 98 __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid]) 99 : "memory" /* paranoid */); 100 101 /* Attach to the address space of init_task. */ 102 atomic_inc(&init_mm.mm_count); 103 current->active_mm = &init_mm; 104 105 while (!cpu_isset(cpuid, smp_commenced_mask)) 106 mb(); 107 108 local_irq_enable(); 109 cpu_set(cpuid, cpu_online_map); 110 } 111 112 /* 113 * Cycle through the processors asking the PROM to start each one. 114 */ 115 116 extern struct linux_prom_registers smp_penguin_ctable; 117 118 void __init leon_configure_cache_smp(void) 119 { 120 unsigned long cfg = sparc_leon3_get_dcachecfg(); 121 int me = smp_processor_id(); 122 123 if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) { 124 printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n", 125 (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg), 126 (unsigned int)cfg, (unsigned int)me); 127 sparc_leon3_disable_cache(); 128 } else { 129 if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) { 130 sparc_leon3_enable_snooping(); 131 } else { 132 printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n", 133 me); 134 sparc_leon3_disable_cache(); 135 } 136 } 137 138 local_flush_cache_all(); 139 local_flush_tlb_all(); 140 } 141 142 void leon_smp_setbroadcast(unsigned int mask) 143 { 144 int broadcast = 145 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> 146 LEON3_IRQMPSTATUS_BROADCAST) & 1); 147 if (!broadcast) { 148 prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n", 149 leon_smp_nrcpus()); 150 if (leon_smp_nrcpus() > 1) { 151 BUG(); 152 } else { 153 prom_printf("continue anyway\n"); 154 return; 155 } 156 } 157 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask); 158 } 159 160 unsigned int leon_smp_getbroadcast(void) 161 { 162 unsigned int mask; 163 mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast)); 164 return mask; 165 } 166 167 int leon_smp_nrcpus(void) 168 { 169 int nrcpu = 170 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> 171 LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1; 172 return nrcpu; 173 } 174 175 void __init leon_boot_cpus(void) 176 { 177 int nrcpu = leon_smp_nrcpus(); 178 int me = smp_processor_id(); 179 180 printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x \n", (unsigned int)me, 181 (unsigned int)nrcpu, (unsigned int)NR_CPUS, 182 (unsigned int)&(leon3_irqctrl_regs->mpstatus)); 183 184 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me); 185 leon_enable_irq_cpu(LEON3_IRQ_TICKER, me); 186 leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me); 187 188 leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER); 189 190 leon_configure_cache_smp(); 191 smp_setup_percpu_timer(); 192 local_flush_cache_all(); 193 194 } 195 196 int __cpuinit leon_boot_one_cpu(int i) 197 { 198 199 struct task_struct *p; 200 int timeout; 201 202 /* Cook up an idler for this guy. */ 203 p = fork_idle(i); 204 205 current_set[i] = task_thread_info(p); 206 207 /* See trampoline.S:leon_smp_cpu_startup for details... 208 * Initialize the contexts table 209 * Since the call to prom_startcpu() trashes the structure, 210 * we need to re-initialize it for each cpu 211 */ 212 smp_penguin_ctable.which_io = 0; 213 smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys; 214 smp_penguin_ctable.reg_size = 0; 215 216 /* whirrr, whirrr, whirrrrrrrrr... */ 217 printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i, 218 (unsigned int)&leon3_irqctrl_regs->mpstatus); 219 local_flush_cache_all(); 220 221 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i); 222 223 /* wheee... it's going... */ 224 for (timeout = 0; timeout < 10000; timeout++) { 225 if (cpu_callin_map[i]) 226 break; 227 udelay(200); 228 } 229 printk(KERN_INFO "Started CPU %d \n", (unsigned int)i); 230 231 if (!(cpu_callin_map[i])) { 232 printk(KERN_ERR "Processor %d is stuck.\n", i); 233 return -ENODEV; 234 } else { 235 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i); 236 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i); 237 leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i); 238 } 239 240 local_flush_cache_all(); 241 return 0; 242 } 243 244 void __init leon_smp_done(void) 245 { 246 247 int i, first; 248 int *prev; 249 250 /* setup cpu list for irq rotation */ 251 first = 0; 252 prev = &first; 253 for (i = 0; i < NR_CPUS; i++) { 254 if (cpu_online(i)) { 255 *prev = i; 256 prev = &cpu_data(i).next; 257 } 258 } 259 *prev = first; 260 local_flush_cache_all(); 261 262 /* Free unneeded trap tables */ 263 if (!cpu_isset(1, cpu_present_map)) { 264 ClearPageReserved(virt_to_page(trapbase_cpu1)); 265 init_page_count(virt_to_page(trapbase_cpu1)); 266 free_page((unsigned long)trapbase_cpu1); 267 totalram_pages++; 268 num_physpages++; 269 } 270 if (!cpu_isset(2, cpu_present_map)) { 271 ClearPageReserved(virt_to_page(trapbase_cpu2)); 272 init_page_count(virt_to_page(trapbase_cpu2)); 273 free_page((unsigned long)trapbase_cpu2); 274 totalram_pages++; 275 num_physpages++; 276 } 277 if (!cpu_isset(3, cpu_present_map)) { 278 ClearPageReserved(virt_to_page(trapbase_cpu3)); 279 init_page_count(virt_to_page(trapbase_cpu3)); 280 free_page((unsigned long)trapbase_cpu3); 281 totalram_pages++; 282 num_physpages++; 283 } 284 /* Ok, they are spinning and ready to go. */ 285 smp_processors_ready = 1; 286 287 } 288 289 void leon_irq_rotate(int cpu) 290 { 291 } 292 293 static struct smp_funcall { 294 smpfunc_t func; 295 unsigned long arg1; 296 unsigned long arg2; 297 unsigned long arg3; 298 unsigned long arg4; 299 unsigned long arg5; 300 unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */ 301 unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */ 302 } ccall_info; 303 304 static DEFINE_SPINLOCK(cross_call_lock); 305 306 /* Cross calls must be serialized, at least currently. */ 307 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, 308 unsigned long arg2, unsigned long arg3, 309 unsigned long arg4) 310 { 311 if (smp_processors_ready) { 312 register int high = NR_CPUS - 1; 313 unsigned long flags; 314 315 spin_lock_irqsave(&cross_call_lock, flags); 316 317 { 318 /* If you make changes here, make sure gcc generates proper code... */ 319 register smpfunc_t f asm("i0") = func; 320 register unsigned long a1 asm("i1") = arg1; 321 register unsigned long a2 asm("i2") = arg2; 322 register unsigned long a3 asm("i3") = arg3; 323 register unsigned long a4 asm("i4") = arg4; 324 register unsigned long a5 asm("i5") = 0; 325 326 __asm__ __volatile__("std %0, [%6]\n\t" 327 "std %2, [%6 + 8]\n\t" 328 "std %4, [%6 + 16]\n\t" : : 329 "r"(f), "r"(a1), "r"(a2), "r"(a3), 330 "r"(a4), "r"(a5), 331 "r"(&ccall_info.func)); 332 } 333 334 /* Init receive/complete mapping, plus fire the IPI's off. */ 335 { 336 register int i; 337 338 cpu_clear(smp_processor_id(), mask); 339 cpus_and(mask, cpu_online_map, mask); 340 for (i = 0; i <= high; i++) { 341 if (cpu_isset(i, mask)) { 342 ccall_info.processors_in[i] = 0; 343 ccall_info.processors_out[i] = 0; 344 set_cpu_int(i, LEON3_IRQ_CROSS_CALL); 345 346 } 347 } 348 } 349 350 { 351 register int i; 352 353 i = 0; 354 do { 355 if (!cpu_isset(i, mask)) 356 continue; 357 358 while (!ccall_info.processors_in[i]) 359 barrier(); 360 } while (++i <= high); 361 362 i = 0; 363 do { 364 if (!cpu_isset(i, mask)) 365 continue; 366 367 while (!ccall_info.processors_out[i]) 368 barrier(); 369 } while (++i <= high); 370 } 371 372 spin_unlock_irqrestore(&cross_call_lock, flags); 373 } 374 } 375 376 /* Running cross calls. */ 377 void leon_cross_call_irq(void) 378 { 379 int i = smp_processor_id(); 380 381 ccall_info.processors_in[i] = 1; 382 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, 383 ccall_info.arg4, ccall_info.arg5); 384 ccall_info.processors_out[i] = 1; 385 } 386 387 void leon_percpu_timer_interrupt(struct pt_regs *regs) 388 { 389 struct pt_regs *old_regs; 390 int cpu = smp_processor_id(); 391 392 old_regs = set_irq_regs(regs); 393 394 leon_clear_profile_irq(cpu); 395 396 profile_tick(CPU_PROFILING); 397 398 if (!--prof_counter(cpu)) { 399 int user = user_mode(regs); 400 401 irq_enter(); 402 update_process_times(user); 403 irq_exit(); 404 405 prof_counter(cpu) = prof_multiplier(cpu); 406 } 407 set_irq_regs(old_regs); 408 } 409 410 static void __init smp_setup_percpu_timer(void) 411 { 412 int cpu = smp_processor_id(); 413 414 prof_counter(cpu) = prof_multiplier(cpu) = 1; 415 } 416 417 void __init leon_blackbox_id(unsigned *addr) 418 { 419 int rd = *addr & 0x3e000000; 420 int rs1 = rd >> 11; 421 422 /* patch places where ___b_hard_smp_processor_id appears */ 423 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */ 424 addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */ 425 addr[2] = 0x01000000; /* nop */ 426 } 427 428 void __init leon_blackbox_current(unsigned *addr) 429 { 430 int rd = *addr & 0x3e000000; 431 int rs1 = rd >> 11; 432 433 /* patch LOAD_CURRENT macro where ___b_load_current appears */ 434 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */ 435 addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */ 436 addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */ 437 438 } 439 440 /* 441 * CPU idle callback function 442 * See .../arch/sparc/kernel/process.c 443 */ 444 void pmc_leon_idle(void) 445 { 446 __asm__ volatile ("mov %g0, %asr19"); 447 } 448 449 void __init leon_init_smp(void) 450 { 451 /* Patch ipi15 trap table */ 452 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m); 453 454 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id); 455 BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current); 456 BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM); 457 BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id, 458 BTFIXUPCALL_NORM); 459 460 #ifndef PMC_NO_IDLE 461 /* Assign power management IDLE handler */ 462 pm_idle = pmc_leon_idle; 463 printk(KERN_INFO "leon: power management initialized\n"); 464 #endif 465 466 } 467 468 #endif /* CONFIG_SPARC_LEON */ 469