arch/sparc/kernel/leon_smp.c

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