1 // SPDX-License-Identifier: GPL-2.0 2 /* Sparc SS1000/SC2000 SMP support. 3 * 4 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 5 * 6 * Based on sun4m's smp.c, which is: 7 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 8 */ 9 10 #include <linux/clockchips.h> 11 #include <linux/interrupt.h> 12 #include <linux/profile.h> 13 #include <linux/delay.h> 14 #include <linux/sched/mm.h> 15 #include <linux/cpu.h> 16 17 #include <asm/cacheflush.h> 18 #include <asm/switch_to.h> 19 #include <asm/tlbflush.h> 20 #include <asm/timer.h> 21 #include <asm/oplib.h> 22 #include <asm/sbi.h> 23 #include <asm/mmu.h> 24 25 #include "kernel.h" 26 #include "irq.h" 27 28 #define IRQ_CROSS_CALL 15 29 30 static volatile int smp_processors_ready; 31 static int smp_highest_cpu; 32 sun4d_swap(volatile unsigned long * ptr,unsigned long val)33 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val) 34 { 35 __asm__ __volatile__("swap [%1], %0\n\t" : 36 "=&r" (val), "=&r" (ptr) : 37 "0" (val), "1" (ptr)); 38 return val; 39 } 40 41 static void smp4d_ipi_init(void); 42 43 static unsigned char cpu_leds[32]; 44 show_leds(int cpuid)45 static inline void show_leds(int cpuid) 46 { 47 cpuid &= 0x1e; 48 __asm__ __volatile__ ("stba %0, [%1] %2" : : 49 "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]), 50 "r" (ECSR_BASE(cpuid) | BB_LEDS), 51 "i" (ASI_M_CTL)); 52 } 53 sun4d_cpu_pre_starting(void * arg)54 void sun4d_cpu_pre_starting(void *arg) 55 { 56 int cpuid = hard_smp_processor_id(); 57 58 /* Show we are alive */ 59 cpu_leds[cpuid] = 0x6; 60 show_leds(cpuid); 61 62 /* Enable level15 interrupt, disable level14 interrupt for now */ 63 cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000); 64 } 65 sun4d_cpu_pre_online(void * arg)66 void sun4d_cpu_pre_online(void *arg) 67 { 68 unsigned long flags; 69 int cpuid; 70 71 cpuid = hard_smp_processor_id(); 72 73 /* Unblock the master CPU _only_ when the scheduler state 74 * of all secondary CPUs will be up-to-date, so after 75 * the SMP initialization the master will be just allowed 76 * to call the scheduler code. 77 */ 78 sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1); 79 local_ops->cache_all(); 80 local_ops->tlb_all(); 81 82 while ((unsigned long)current_set[cpuid] < PAGE_OFFSET) 83 barrier(); 84 85 while (current_set[cpuid]->cpu != cpuid) 86 barrier(); 87 88 /* Fix idle thread fields. */ 89 __asm__ __volatile__("ld [%0], %%g6\n\t" 90 : : "r" (¤t_set[cpuid]) 91 : "memory" /* paranoid */); 92 93 cpu_leds[cpuid] = 0x9; 94 show_leds(cpuid); 95 96 /* Attach to the address space of init_task. */ 97 mmgrab(&init_mm); 98 current->active_mm = &init_mm; 99 100 local_ops->cache_all(); 101 local_ops->tlb_all(); 102 103 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) 104 barrier(); 105 106 spin_lock_irqsave(&sun4d_imsk_lock, flags); 107 cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */ 108 spin_unlock_irqrestore(&sun4d_imsk_lock, flags); 109 } 110 111 /* 112 * Cycle through the processors asking the PROM to start each one. 113 */ smp4d_boot_cpus(void)114 void __init smp4d_boot_cpus(void) 115 { 116 smp4d_ipi_init(); 117 if (boot_cpu_id) 118 current_set[0] = NULL; 119 local_ops->cache_all(); 120 } 121 smp4d_boot_one_cpu(int i,struct task_struct * idle)122 int smp4d_boot_one_cpu(int i, struct task_struct *idle) 123 { 124 unsigned long *entry = &sun4d_cpu_startup; 125 int timeout; 126 int cpu_node; 127 128 cpu_find_by_instance(i, &cpu_node, NULL); 129 current_set[i] = task_thread_info(idle); 130 /* 131 * Initialize the contexts table 132 * Since the call to prom_startcpu() trashes the structure, 133 * we need to re-initialize it for each cpu 134 */ 135 smp_penguin_ctable.which_io = 0; 136 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; 137 smp_penguin_ctable.reg_size = 0; 138 139 /* whirrr, whirrr, whirrrrrrrrr... */ 140 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry); 141 local_ops->cache_all(); 142 prom_startcpu(cpu_node, 143 &smp_penguin_ctable, 0, (char *)entry); 144 145 printk(KERN_INFO "prom_startcpu returned :)\n"); 146 147 /* wheee... it's going... */ 148 for (timeout = 0; timeout < 10000; timeout++) { 149 if (cpu_callin_map[i]) 150 break; 151 udelay(200); 152 } 153 154 if (!(cpu_callin_map[i])) { 155 printk(KERN_ERR "Processor %d is stuck.\n", i); 156 return -ENODEV; 157 158 } 159 local_ops->cache_all(); 160 return 0; 161 } 162 smp4d_smp_done(void)163 void __init smp4d_smp_done(void) 164 { 165 int i, first; 166 int *prev; 167 168 /* setup cpu list for irq rotation */ 169 first = 0; 170 prev = &first; 171 for_each_online_cpu(i) { 172 *prev = i; 173 prev = &cpu_data(i).next; 174 } 175 *prev = first; 176 local_ops->cache_all(); 177 178 /* Ok, they are spinning and ready to go. */ 179 smp_processors_ready = 1; 180 sun4d_distribute_irqs(); 181 } 182 183 /* Memory structure giving interrupt handler information about IPI generated */ 184 struct sun4d_ipi_work { 185 int single; 186 int msk; 187 int resched; 188 }; 189 190 static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work, sun4d_ipi_work); 191 192 /* Initialize IPIs on the SUN4D SMP machine */ smp4d_ipi_init(void)193 static void __init smp4d_ipi_init(void) 194 { 195 int cpu; 196 struct sun4d_ipi_work *work; 197 198 printk(KERN_INFO "smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ); 199 200 for_each_possible_cpu(cpu) { 201 work = &per_cpu(sun4d_ipi_work, cpu); 202 work->single = work->msk = work->resched = 0; 203 } 204 } 205 sun4d_ipi_interrupt(void)206 void sun4d_ipi_interrupt(void) 207 { 208 struct sun4d_ipi_work *work = this_cpu_ptr(&sun4d_ipi_work); 209 210 if (work->single) { 211 work->single = 0; 212 smp_call_function_single_interrupt(); 213 } 214 if (work->msk) { 215 work->msk = 0; 216 smp_call_function_interrupt(); 217 } 218 if (work->resched) { 219 work->resched = 0; 220 smp_resched_interrupt(); 221 } 222 } 223 224 /* +-------+-------------+-----------+------------------------------------+ 225 * | bcast | devid | sid | levels mask | 226 * +-------+-------------+-----------+------------------------------------+ 227 * 31 30 23 22 15 14 0 228 */ 229 #define IGEN_MESSAGE(bcast, devid, sid, levels) \ 230 (((bcast) << 31) | ((devid) << 23) | ((sid) << 15) | (levels)) 231 sun4d_send_ipi(int cpu,int level)232 static void sun4d_send_ipi(int cpu, int level) 233 { 234 cc_set_igen(IGEN_MESSAGE(0, cpu << 3, 6 + ((level >> 1) & 7), 1 << (level - 1))); 235 } 236 sun4d_ipi_single(int cpu)237 static void sun4d_ipi_single(int cpu) 238 { 239 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); 240 241 /* Mark work */ 242 work->single = 1; 243 244 /* Generate IRQ on the CPU */ 245 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); 246 } 247 sun4d_ipi_mask_one(int cpu)248 static void sun4d_ipi_mask_one(int cpu) 249 { 250 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); 251 252 /* Mark work */ 253 work->msk = 1; 254 255 /* Generate IRQ on the CPU */ 256 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); 257 } 258 sun4d_ipi_resched(int cpu)259 static void sun4d_ipi_resched(int cpu) 260 { 261 struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); 262 263 /* Mark work */ 264 work->resched = 1; 265 266 /* Generate IRQ on the CPU (any IRQ will cause resched) */ 267 sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); 268 } 269 270 static struct smp_funcall { 271 void *func; 272 unsigned long arg1; 273 unsigned long arg2; 274 unsigned long arg3; 275 unsigned long arg4; 276 unsigned long arg5; 277 unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */ 278 unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */ 279 } ccall_info __attribute__((aligned(8))); 280 281 static DEFINE_SPINLOCK(cross_call_lock); 282 283 /* Cross calls must be serialized, at least currently. */ sun4d_cross_call(void * func,cpumask_t mask,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4)284 static void sun4d_cross_call(void *func, cpumask_t mask, unsigned long arg1, 285 unsigned long arg2, unsigned long arg3, 286 unsigned long arg4) 287 { 288 if (smp_processors_ready) { 289 register int high = smp_highest_cpu; 290 unsigned long flags; 291 292 spin_lock_irqsave(&cross_call_lock, flags); 293 294 { 295 /* 296 * If you make changes here, make sure 297 * gcc generates proper code... 298 */ 299 register void *f asm("i0") = func; 300 register unsigned long a1 asm("i1") = arg1; 301 register unsigned long a2 asm("i2") = arg2; 302 register unsigned long a3 asm("i3") = arg3; 303 register unsigned long a4 asm("i4") = arg4; 304 register unsigned long a5 asm("i5") = 0; 305 306 __asm__ __volatile__( 307 "std %0, [%6]\n\t" 308 "std %2, [%6 + 8]\n\t" 309 "std %4, [%6 + 16]\n\t" : : 310 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), 311 "r" (&ccall_info.func)); 312 } 313 314 /* Init receive/complete mapping, plus fire the IPI's off. */ 315 { 316 register int i; 317 318 cpumask_clear_cpu(smp_processor_id(), &mask); 319 cpumask_and(&mask, cpu_online_mask, &mask); 320 for (i = 0; i <= high; i++) { 321 if (cpumask_test_cpu(i, &mask)) { 322 ccall_info.processors_in[i] = 0; 323 ccall_info.processors_out[i] = 0; 324 sun4d_send_ipi(i, IRQ_CROSS_CALL); 325 } 326 } 327 } 328 329 { 330 register int i; 331 332 i = 0; 333 do { 334 if (!cpumask_test_cpu(i, &mask)) 335 continue; 336 while (!ccall_info.processors_in[i]) 337 barrier(); 338 } while (++i <= high); 339 340 i = 0; 341 do { 342 if (!cpumask_test_cpu(i, &mask)) 343 continue; 344 while (!ccall_info.processors_out[i]) 345 barrier(); 346 } while (++i <= high); 347 } 348 349 spin_unlock_irqrestore(&cross_call_lock, flags); 350 } 351 } 352 353 /* Running cross calls. */ smp4d_cross_call_irq(void)354 void smp4d_cross_call_irq(void) 355 { 356 void (*func)(unsigned long, unsigned long, unsigned long, unsigned long, 357 unsigned long) = ccall_info.func; 358 int i = hard_smp_processor_id(); 359 360 ccall_info.processors_in[i] = 1; 361 func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, ccall_info.arg4, 362 ccall_info.arg5); 363 ccall_info.processors_out[i] = 1; 364 } 365 smp4d_percpu_timer_interrupt(struct pt_regs * regs)366 void smp4d_percpu_timer_interrupt(struct pt_regs *regs) 367 { 368 struct pt_regs *old_regs; 369 int cpu = hard_smp_processor_id(); 370 struct clock_event_device *ce; 371 static int cpu_tick[NR_CPUS]; 372 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; 373 374 old_regs = set_irq_regs(regs); 375 bw_get_prof_limit(cpu); 376 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */ 377 378 cpu_tick[cpu]++; 379 if (!(cpu_tick[cpu] & 15)) { 380 if (cpu_tick[cpu] == 0x60) 381 cpu_tick[cpu] = 0; 382 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4]; 383 show_leds(cpu); 384 } 385 386 ce = &per_cpu(sparc32_clockevent, cpu); 387 388 irq_enter(); 389 ce->event_handler(ce); 390 irq_exit(); 391 392 set_irq_regs(old_regs); 393 } 394 395 static const struct sparc32_ipi_ops sun4d_ipi_ops = { 396 .cross_call = sun4d_cross_call, 397 .resched = sun4d_ipi_resched, 398 .single = sun4d_ipi_single, 399 .mask_one = sun4d_ipi_mask_one, 400 }; 401 sun4d_init_smp(void)402 void __init sun4d_init_smp(void) 403 { 404 int i; 405 406 /* Patch ipi15 trap table */ 407 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m); 408 409 sparc32_ipi_ops = &sun4d_ipi_ops; 410 411 for (i = 0; i < NR_CPUS; i++) { 412 ccall_info.processors_in[i] = 1; 413 ccall_info.processors_out[i] = 1; 414 } 415 } 416