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/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"(&current_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 */