1 /* Sparc SS1000/SC2000 SMP support. 2 * 3 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 4 * 5 * Based on sun4m's smp.c, which is: 6 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 7 */ 8 9 #include <linux/clockchips.h> 10 #include <linux/interrupt.h> 11 #include <linux/profile.h> 12 #include <linux/delay.h> 13 #include <linux/sched/mm.h> 14 #include <linux/cpu.h> 15 16 #include <asm/cacheflush.h> 17 #include <asm/switch_to.h> 18 #include <asm/tlbflush.h> 19 #include <asm/timer.h> 20 #include <asm/oplib.h> 21 #include <asm/sbi.h> 22 #include <asm/mmu.h> 23 24 #include "kernel.h" 25 #include "irq.h" 26 27 #define IRQ_CROSS_CALL 15 28 29 static volatile int smp_processors_ready; 30 static int smp_highest_cpu; 31 32 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val) 33 { 34 __asm__ __volatile__("swap [%1], %0\n\t" : 35 "=&r" (val), "=&r" (ptr) : 36 "0" (val), "1" (ptr)); 37 return val; 38 } 39 40 static void smp4d_ipi_init(void); 41 42 static unsigned char cpu_leds[32]; 43 44 static inline void show_leds(int cpuid) 45 { 46 cpuid &= 0x1e; 47 __asm__ __volatile__ ("stba %0, [%1] %2" : : 48 "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]), 49 "r" (ECSR_BASE(cpuid) | BB_LEDS), 50 "i" (ASI_M_CTL)); 51 } 52 53 void sun4d_cpu_pre_starting(void *arg) 54 { 55 int cpuid = hard_smp_processor_id(); 56 57 /* Show we are alive */ 58 cpu_leds[cpuid] = 0x6; 59 show_leds(cpuid); 60 61 /* Enable level15 interrupt, disable level14 interrupt for now */ 62 cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000); 63 } 64 65 void sun4d_cpu_pre_online(void *arg) 66 { 67 unsigned long flags; 68 int cpuid; 69 70 cpuid = hard_smp_processor_id(); 71 72 /* Unblock the master CPU _only_ when the scheduler state 73 * of all secondary CPUs will be up-to-date, so after 74 * the SMP initialization the master will be just allowed 75 * to call the scheduler code. 76 */ 77 sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1); 78 local_ops->cache_all(); 79 local_ops->tlb_all(); 80 81 while ((unsigned long)current_set[cpuid] < PAGE_OFFSET) 82 barrier(); 83 84 while (current_set[cpuid]->cpu != cpuid) 85 barrier(); 86 87 /* Fix idle thread fields. */ 88 __asm__ __volatile__("ld [%0], %%g6\n\t" 89 : : "r" (¤t_set[cpuid]) 90 : "memory" /* paranoid */); 91 92 cpu_leds[cpuid] = 0x9; 93 show_leds(cpuid); 94 95 /* Attach to the address space of init_task. */ 96 mmgrab(&init_mm); 97 current->active_mm = &init_mm; 98 99 local_ops->cache_all(); 100 local_ops->tlb_all(); 101 102 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) 103 barrier(); 104 105 spin_lock_irqsave(&sun4d_imsk_lock, flags); 106 cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */ 107 spin_unlock_irqrestore(&sun4d_imsk_lock, flags); 108 } 109 110 /* 111 * Cycle through the processors asking the PROM to start each one. 112 */ 113 void __init smp4d_boot_cpus(void) 114 { 115 smp4d_ipi_init(); 116 if (boot_cpu_id) 117 current_set[0] = NULL; 118 local_ops->cache_all(); 119 } 120 121 int smp4d_boot_one_cpu(int i, struct task_struct *idle) 122 { 123 unsigned long *entry = &sun4d_cpu_startup; 124 int timeout; 125 int cpu_node; 126 127 cpu_find_by_instance(i, &cpu_node, NULL); 128 current_set[i] = task_thread_info(idle); 129 /* 130 * Initialize the contexts table 131 * Since the call to prom_startcpu() trashes the structure, 132 * we need to re-initialize it for each cpu 133 */ 134 smp_penguin_ctable.which_io = 0; 135 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; 136 smp_penguin_ctable.reg_size = 0; 137 138 /* whirrr, whirrr, whirrrrrrrrr... */ 139 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry); 140 local_ops->cache_all(); 141 prom_startcpu(cpu_node, 142 &smp_penguin_ctable, 0, (char *)entry); 143 144 printk(KERN_INFO "prom_startcpu returned :)\n"); 145 146 /* wheee... it's going... */ 147 for (timeout = 0; timeout < 10000; timeout++) { 148 if (cpu_callin_map[i]) 149 break; 150 udelay(200); 151 } 152 153 if (!(cpu_callin_map[i])) { 154 printk(KERN_ERR "Processor %d is stuck.\n", i); 155 return -ENODEV; 156 157 } 158 local_ops->cache_all(); 159 return 0; 160 } 161 162 void __init smp4d_smp_done(void) 163 { 164 int i, first; 165 int *prev; 166 167 /* setup cpu list for irq rotation */ 168 first = 0; 169 prev = &first; 170 for_each_online_cpu(i) { 171 *prev = i; 172 prev = &cpu_data(i).next; 173 } 174 *prev = first; 175 local_ops->cache_all(); 176 177 /* Ok, they are spinning and ready to go. */ 178 smp_processors_ready = 1; 179 sun4d_distribute_irqs(); 180 } 181 182 /* Memory structure giving interrupt handler information about IPI generated */ 183 struct sun4d_ipi_work { 184 int single; 185 int msk; 186 int resched; 187 }; 188 189 static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work, sun4d_ipi_work); 190 191 /* Initialize IPIs on the SUN4D SMP machine */ 192 static void __init smp4d_ipi_init(void) 193 { 194 int cpu; 195 struct sun4d_ipi_work *work; 196 197 printk(KERN_INFO "smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ); 198 199 for_each_possible_cpu(cpu) { 200 work = &per_cpu(sun4d_ipi_work, cpu); 201 work->single = work->msk = work->resched = 0; 202 } 203 } 204 205 void sun4d_ipi_interrupt(void) 206 { 207 struct sun4d_ipi_work *work = this_cpu_ptr(&sun4d_ipi_work); 208 209 if (work->single) { 210 work->single = 0; 211 smp_call_function_single_interrupt(); 212 } 213 if (work->msk) { 214 work->msk = 0; 215 smp_call_function_interrupt(); 216 } 217 if (work->resched) { 218 work->resched = 0; 219 smp_resched_interrupt(); 220 } 221 } 222 223 /* +-------+-------------+-----------+------------------------------------+ 224 * | bcast | devid | sid | levels mask | 225 * +-------+-------------+-----------+------------------------------------+ 226 * 31 30 23 22 15 14 0 227 */ 228 #define IGEN_MESSAGE(bcast, devid, sid, levels) \ 229 (((bcast) << 31) | ((devid) << 23) | ((sid) << 15) | (levels)) 230 231 static void sun4d_send_ipi(int cpu, int level) 232 { 233 cc_set_igen(IGEN_MESSAGE(0, cpu << 3, 6 + ((level >> 1) & 7), 1 << (level - 1))); 234 } 235 236 static void sun4d_ipi_single(int cpu) 237 { 238 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); 239 240 /* Mark work */ 241 work->single = 1; 242 243 /* Generate IRQ on the CPU */ 244 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); 245 } 246 247 static void sun4d_ipi_mask_one(int cpu) 248 { 249 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); 250 251 /* Mark work */ 252 work->msk = 1; 253 254 /* Generate IRQ on the CPU */ 255 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); 256 } 257 258 static void sun4d_ipi_resched(int cpu) 259 { 260 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); 261 262 /* Mark work */ 263 work->resched = 1; 264 265 /* Generate IRQ on the CPU (any IRQ will cause resched) */ 266 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); 267 } 268 269 static struct smp_funcall { 270 smpfunc_t func; 271 unsigned long arg1; 272 unsigned long arg2; 273 unsigned long arg3; 274 unsigned long arg4; 275 unsigned long arg5; 276 unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */ 277 unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */ 278 } ccall_info __attribute__((aligned(8))); 279 280 static DEFINE_SPINLOCK(cross_call_lock); 281 282 /* Cross calls must be serialized, at least currently. */ 283 static void sun4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, 284 unsigned long arg2, unsigned long arg3, 285 unsigned long arg4) 286 { 287 if (smp_processors_ready) { 288 register int high = smp_highest_cpu; 289 unsigned long flags; 290 291 spin_lock_irqsave(&cross_call_lock, flags); 292 293 { 294 /* 295 * If you make changes here, make sure 296 * gcc generates proper code... 297 */ 298 register smpfunc_t f asm("i0") = func; 299 register unsigned long a1 asm("i1") = arg1; 300 register unsigned long a2 asm("i2") = arg2; 301 register unsigned long a3 asm("i3") = arg3; 302 register unsigned long a4 asm("i4") = arg4; 303 register unsigned long a5 asm("i5") = 0; 304 305 __asm__ __volatile__( 306 "std %0, [%6]\n\t" 307 "std %2, [%6 + 8]\n\t" 308 "std %4, [%6 + 16]\n\t" : : 309 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), 310 "r" (&ccall_info.func)); 311 } 312 313 /* Init receive/complete mapping, plus fire the IPI's off. */ 314 { 315 register int i; 316 317 cpumask_clear_cpu(smp_processor_id(), &mask); 318 cpumask_and(&mask, cpu_online_mask, &mask); 319 for (i = 0; i <= high; i++) { 320 if (cpumask_test_cpu(i, &mask)) { 321 ccall_info.processors_in[i] = 0; 322 ccall_info.processors_out[i] = 0; 323 sun4d_send_ipi(i, IRQ_CROSS_CALL); 324 } 325 } 326 } 327 328 { 329 register int i; 330 331 i = 0; 332 do { 333 if (!cpumask_test_cpu(i, &mask)) 334 continue; 335 while (!ccall_info.processors_in[i]) 336 barrier(); 337 } while (++i <= high); 338 339 i = 0; 340 do { 341 if (!cpumask_test_cpu(i, &mask)) 342 continue; 343 while (!ccall_info.processors_out[i]) 344 barrier(); 345 } while (++i <= high); 346 } 347 348 spin_unlock_irqrestore(&cross_call_lock, flags); 349 } 350 } 351 352 /* Running cross calls. */ 353 void smp4d_cross_call_irq(void) 354 { 355 int i = hard_smp_processor_id(); 356 357 ccall_info.processors_in[i] = 1; 358 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, 359 ccall_info.arg4, ccall_info.arg5); 360 ccall_info.processors_out[i] = 1; 361 } 362 363 void smp4d_percpu_timer_interrupt(struct pt_regs *regs) 364 { 365 struct pt_regs *old_regs; 366 int cpu = hard_smp_processor_id(); 367 struct clock_event_device *ce; 368 static int cpu_tick[NR_CPUS]; 369 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; 370 371 old_regs = set_irq_regs(regs); 372 bw_get_prof_limit(cpu); 373 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */ 374 375 cpu_tick[cpu]++; 376 if (!(cpu_tick[cpu] & 15)) { 377 if (cpu_tick[cpu] == 0x60) 378 cpu_tick[cpu] = 0; 379 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4]; 380 show_leds(cpu); 381 } 382 383 ce = &per_cpu(sparc32_clockevent, cpu); 384 385 irq_enter(); 386 ce->event_handler(ce); 387 irq_exit(); 388 389 set_irq_regs(old_regs); 390 } 391 392 static const struct sparc32_ipi_ops sun4d_ipi_ops = { 393 .cross_call = sun4d_cross_call, 394 .resched = sun4d_ipi_resched, 395 .single = sun4d_ipi_single, 396 .mask_one = sun4d_ipi_mask_one, 397 }; 398 399 void __init sun4d_init_smp(void) 400 { 401 int i; 402 403 /* Patch ipi15 trap table */ 404 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m); 405 406 sparc32_ipi_ops = &sun4d_ipi_ops; 407 408 for (i = 0; i < NR_CPUS; i++) { 409 ccall_info.processors_in[i] = 1; 410 ccall_info.processors_out[i] = 1; 411 } 412 } 413