1 /* sun4m_smp.c: Sparc SUN4M SMP support. 2 * 3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 4 */ 5 6 #include <asm/head.h> 7 8 #include <linux/kernel.h> 9 #include <linux/sched.h> 10 #include <linux/threads.h> 11 #include <linux/smp.h> 12 #include <linux/interrupt.h> 13 #include <linux/kernel_stat.h> 14 #include <linux/init.h> 15 #include <linux/spinlock.h> 16 #include <linux/mm.h> 17 #include <linux/swap.h> 18 #include <linux/profile.h> 19 #include <linux/delay.h> 20 #include <linux/cpu.h> 21 22 #include <asm/cacheflush.h> 23 #include <asm/tlbflush.h> 24 #include <asm/irq_regs.h> 25 26 #include <asm/ptrace.h> 27 #include <asm/atomic.h> 28 29 #include <asm/irq.h> 30 #include <asm/page.h> 31 #include <asm/pgalloc.h> 32 #include <asm/pgtable.h> 33 #include <asm/oplib.h> 34 #include <asm/cpudata.h> 35 36 #include "irq.h" 37 38 #define IRQ_CROSS_CALL 15 39 40 extern ctxd_t *srmmu_ctx_table_phys; 41 42 extern volatile unsigned long cpu_callin_map[NR_CPUS]; 43 extern unsigned char boot_cpu_id; 44 45 extern cpumask_t smp_commenced_mask; 46 47 extern int __smp4m_processor_id(void); 48 49 /*#define SMP_DEBUG*/ 50 51 #ifdef SMP_DEBUG 52 #define SMP_PRINTK(x) printk x 53 #else 54 #define SMP_PRINTK(x) 55 #endif 56 57 static inline unsigned long 58 swap_ulong(volatile unsigned long *ptr, unsigned long val) 59 { 60 __asm__ __volatile__("swap [%1], %0\n\t" : 61 "=&r" (val), "=&r" (ptr) : 62 "0" (val), "1" (ptr)); 63 return val; 64 } 65 66 static void smp_setup_percpu_timer(void); 67 extern void cpu_probe(void); 68 69 void __cpuinit smp4m_callin(void) 70 { 71 int cpuid = hard_smp_processor_id(); 72 73 local_flush_cache_all(); 74 local_flush_tlb_all(); 75 76 notify_cpu_starting(cpuid); 77 78 /* Get our local ticker going. */ 79 smp_setup_percpu_timer(); 80 81 calibrate_delay(); 82 smp_store_cpu_info(cpuid); 83 84 local_flush_cache_all(); 85 local_flush_tlb_all(); 86 87 /* 88 * Unblock the master CPU _only_ when the scheduler state 89 * of all secondary CPUs will be up-to-date, so after 90 * the SMP initialization the master will be just allowed 91 * to call the scheduler code. 92 */ 93 /* Allow master to continue. */ 94 swap_ulong(&cpu_callin_map[cpuid], 1); 95 96 /* XXX: What's up with all the flushes? */ 97 local_flush_cache_all(); 98 local_flush_tlb_all(); 99 100 cpu_probe(); 101 102 /* Fix idle thread fields. */ 103 __asm__ __volatile__("ld [%0], %%g6\n\t" 104 : : "r" (¤t_set[cpuid]) 105 : "memory" /* paranoid */); 106 107 /* Attach to the address space of init_task. */ 108 atomic_inc(&init_mm.mm_count); 109 current->active_mm = &init_mm; 110 111 while (!cpu_isset(cpuid, smp_commenced_mask)) 112 mb(); 113 114 local_irq_enable(); 115 116 set_cpu_online(cpuid, true); 117 } 118 119 /* 120 * Cycle through the processors asking the PROM to start each one. 121 */ 122 123 extern struct linux_prom_registers smp_penguin_ctable; 124 extern unsigned long trapbase_cpu1[]; 125 extern unsigned long trapbase_cpu2[]; 126 extern unsigned long trapbase_cpu3[]; 127 128 void __init smp4m_boot_cpus(void) 129 { 130 smp_setup_percpu_timer(); 131 local_flush_cache_all(); 132 } 133 134 int __cpuinit smp4m_boot_one_cpu(int i) 135 { 136 extern unsigned long sun4m_cpu_startup; 137 unsigned long *entry = &sun4m_cpu_startup; 138 struct task_struct *p; 139 int timeout; 140 int cpu_node; 141 142 cpu_find_by_mid(i, &cpu_node); 143 144 /* Cook up an idler for this guy. */ 145 p = fork_idle(i); 146 current_set[i] = task_thread_info(p); 147 /* See trampoline.S for details... */ 148 entry += ((i-1) * 3); 149 150 /* 151 * Initialize the contexts table 152 * Since the call to prom_startcpu() trashes the structure, 153 * we need to re-initialize it for each cpu 154 */ 155 smp_penguin_ctable.which_io = 0; 156 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; 157 smp_penguin_ctable.reg_size = 0; 158 159 /* whirrr, whirrr, whirrrrrrrrr... */ 160 printk("Starting CPU %d at %p\n", i, entry); 161 local_flush_cache_all(); 162 prom_startcpu(cpu_node, 163 &smp_penguin_ctable, 0, (char *)entry); 164 165 /* wheee... it's going... */ 166 for(timeout = 0; timeout < 10000; timeout++) { 167 if(cpu_callin_map[i]) 168 break; 169 udelay(200); 170 } 171 172 if (!(cpu_callin_map[i])) { 173 printk("Processor %d is stuck.\n", i); 174 return -ENODEV; 175 } 176 177 local_flush_cache_all(); 178 return 0; 179 } 180 181 void __init smp4m_smp_done(void) 182 { 183 int i, first; 184 int *prev; 185 186 /* setup cpu list for irq rotation */ 187 first = 0; 188 prev = &first; 189 for_each_online_cpu(i) { 190 *prev = i; 191 prev = &cpu_data(i).next; 192 } 193 *prev = first; 194 local_flush_cache_all(); 195 196 /* Free unneeded trap tables */ 197 if (!cpu_isset(1, cpu_present_map)) { 198 ClearPageReserved(virt_to_page(trapbase_cpu1)); 199 init_page_count(virt_to_page(trapbase_cpu1)); 200 free_page((unsigned long)trapbase_cpu1); 201 totalram_pages++; 202 num_physpages++; 203 } 204 if (!cpu_isset(2, cpu_present_map)) { 205 ClearPageReserved(virt_to_page(trapbase_cpu2)); 206 init_page_count(virt_to_page(trapbase_cpu2)); 207 free_page((unsigned long)trapbase_cpu2); 208 totalram_pages++; 209 num_physpages++; 210 } 211 if (!cpu_isset(3, cpu_present_map)) { 212 ClearPageReserved(virt_to_page(trapbase_cpu3)); 213 init_page_count(virt_to_page(trapbase_cpu3)); 214 free_page((unsigned long)trapbase_cpu3); 215 totalram_pages++; 216 num_physpages++; 217 } 218 219 /* Ok, they are spinning and ready to go. */ 220 } 221 222 /* At each hardware IRQ, we get this called to forward IRQ reception 223 * to the next processor. The caller must disable the IRQ level being 224 * serviced globally so that there are no double interrupts received. 225 * 226 * XXX See sparc64 irq.c. 227 */ 228 void smp4m_irq_rotate(int cpu) 229 { 230 int next = cpu_data(cpu).next; 231 if (next != cpu) 232 set_irq_udt(next); 233 } 234 235 static struct smp_funcall { 236 smpfunc_t func; 237 unsigned long arg1; 238 unsigned long arg2; 239 unsigned long arg3; 240 unsigned long arg4; 241 unsigned long arg5; 242 unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */ 243 unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */ 244 } ccall_info; 245 246 static DEFINE_SPINLOCK(cross_call_lock); 247 248 /* Cross calls must be serialized, at least currently. */ 249 static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, 250 unsigned long arg2, unsigned long arg3, 251 unsigned long arg4) 252 { 253 register int ncpus = SUN4M_NCPUS; 254 unsigned long flags; 255 256 spin_lock_irqsave(&cross_call_lock, flags); 257 258 /* Init function glue. */ 259 ccall_info.func = func; 260 ccall_info.arg1 = arg1; 261 ccall_info.arg2 = arg2; 262 ccall_info.arg3 = arg3; 263 ccall_info.arg4 = arg4; 264 ccall_info.arg5 = 0; 265 266 /* Init receive/complete mapping, plus fire the IPI's off. */ 267 { 268 register int i; 269 270 cpu_clear(smp_processor_id(), mask); 271 cpus_and(mask, cpu_online_map, mask); 272 for(i = 0; i < ncpus; i++) { 273 if (cpu_isset(i, mask)) { 274 ccall_info.processors_in[i] = 0; 275 ccall_info.processors_out[i] = 0; 276 set_cpu_int(i, IRQ_CROSS_CALL); 277 } else { 278 ccall_info.processors_in[i] = 1; 279 ccall_info.processors_out[i] = 1; 280 } 281 } 282 } 283 284 { 285 register int i; 286 287 i = 0; 288 do { 289 if (!cpu_isset(i, mask)) 290 continue; 291 while(!ccall_info.processors_in[i]) 292 barrier(); 293 } while(++i < ncpus); 294 295 i = 0; 296 do { 297 if (!cpu_isset(i, mask)) 298 continue; 299 while(!ccall_info.processors_out[i]) 300 barrier(); 301 } while(++i < ncpus); 302 } 303 304 spin_unlock_irqrestore(&cross_call_lock, flags); 305 } 306 307 /* Running cross calls. */ 308 void smp4m_cross_call_irq(void) 309 { 310 int i = smp_processor_id(); 311 312 ccall_info.processors_in[i] = 1; 313 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, 314 ccall_info.arg4, ccall_info.arg5); 315 ccall_info.processors_out[i] = 1; 316 } 317 318 extern void sun4m_clear_profile_irq(int cpu); 319 320 void smp4m_percpu_timer_interrupt(struct pt_regs *regs) 321 { 322 struct pt_regs *old_regs; 323 int cpu = smp_processor_id(); 324 325 old_regs = set_irq_regs(regs); 326 327 sun4m_clear_profile_irq(cpu); 328 329 profile_tick(CPU_PROFILING); 330 331 if(!--prof_counter(cpu)) { 332 int user = user_mode(regs); 333 334 irq_enter(); 335 update_process_times(user); 336 irq_exit(); 337 338 prof_counter(cpu) = prof_multiplier(cpu); 339 } 340 set_irq_regs(old_regs); 341 } 342 343 extern unsigned int lvl14_resolution; 344 345 static void __cpuinit smp_setup_percpu_timer(void) 346 { 347 int cpu = smp_processor_id(); 348 349 prof_counter(cpu) = prof_multiplier(cpu) = 1; 350 load_profile_irq(cpu, lvl14_resolution); 351 352 if(cpu == boot_cpu_id) 353 enable_pil_irq(14); 354 } 355 356 static void __init smp4m_blackbox_id(unsigned *addr) 357 { 358 int rd = *addr & 0x3e000000; 359 int rs1 = rd >> 11; 360 361 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ 362 addr[1] = 0x8130200c | rd | rs1; /* srl reg, 0xc, reg */ 363 addr[2] = 0x80082003 | rd | rs1; /* and reg, 3, reg */ 364 } 365 366 static void __init smp4m_blackbox_current(unsigned *addr) 367 { 368 int rd = *addr & 0x3e000000; 369 int rs1 = rd >> 11; 370 371 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ 372 addr[2] = 0x8130200a | rd | rs1; /* srl reg, 0xa, reg */ 373 addr[4] = 0x8008200c | rd | rs1; /* and reg, 0xc, reg */ 374 } 375 376 void __init sun4m_init_smp(void) 377 { 378 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id); 379 BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current); 380 BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM); 381 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM); 382 } 383