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 40extern ctxd_t *srmmu_ctx_table_phys; 41 42extern volatile unsigned long cpu_callin_map[NR_CPUS]; 43extern unsigned char boot_cpu_id; 44 45extern cpumask_t smp_commenced_mask; 46 47extern 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 57static inline unsigned long 58swap_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 66static void smp_setup_percpu_timer(void); 67extern void cpu_probe(void); 68 69void __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 local_flush_cache_all(); 97 local_flush_tlb_all(); 98 99 cpu_probe(); 100 101 /* Fix idle thread fields. */ 102 __asm__ __volatile__("ld [%0], %%g6\n\t" 103 : : "r" (¤t_set[cpuid]) 104 : "memory" /* paranoid */); 105 106 /* Attach to the address space of init_task. */ 107 atomic_inc(&init_mm.mm_count); 108 current->active_mm = &init_mm; 109 110 while (!cpu_isset(cpuid, smp_commenced_mask)) 111 mb(); 112 113 local_irq_enable(); 114 115 set_cpu_online(cpuid, true); 116} 117 118/* 119 * Cycle through the processors asking the PROM to start each one. 120 */ 121 122extern struct linux_prom_registers smp_penguin_ctable; 123 124void __init smp4m_boot_cpus(void) 125{ 126 smp_setup_percpu_timer(); 127 local_flush_cache_all(); 128} 129 130int __cpuinit smp4m_boot_one_cpu(int i) 131{ 132 extern unsigned long sun4m_cpu_startup; 133 unsigned long *entry = &sun4m_cpu_startup; 134 struct task_struct *p; 135 int timeout; 136 int cpu_node; 137 138 cpu_find_by_mid(i, &cpu_node); 139 140 /* Cook up an idler for this guy. */ 141 p = fork_idle(i); 142 current_set[i] = task_thread_info(p); 143 /* See trampoline.S for details... */ 144 entry += ((i-1) * 3); 145 146 /* 147 * Initialize the contexts table 148 * Since the call to prom_startcpu() trashes the structure, 149 * we need to re-initialize it for each cpu 150 */ 151 smp_penguin_ctable.which_io = 0; 152 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; 153 smp_penguin_ctable.reg_size = 0; 154 155 /* whirrr, whirrr, whirrrrrrrrr... */ 156 printk("Starting CPU %d at %p\n", i, entry); 157 local_flush_cache_all(); 158 prom_startcpu(cpu_node, 159 &smp_penguin_ctable, 0, (char *)entry); 160 161 /* wheee... it's going... */ 162 for(timeout = 0; timeout < 10000; timeout++) { 163 if(cpu_callin_map[i]) 164 break; 165 udelay(200); 166 } 167 168 if (!(cpu_callin_map[i])) { 169 printk("Processor %d is stuck.\n", i); 170 return -ENODEV; 171 } 172 173 local_flush_cache_all(); 174 return 0; 175} 176 177void __init smp4m_smp_done(void) 178{ 179 int i, first; 180 int *prev; 181 182 /* setup cpu list for irq rotation */ 183 first = 0; 184 prev = &first; 185 for_each_online_cpu(i) { 186 *prev = i; 187 prev = &cpu_data(i).next; 188 } 189 *prev = first; 190 local_flush_cache_all(); 191 192 /* Ok, they are spinning and ready to go. */ 193} 194 195void smp4m_irq_rotate(int cpu) 196{ 197 int next = cpu_data(cpu).next; 198 if (next != cpu) 199 set_irq_udt(next); 200} 201 202static struct smp_funcall { 203 smpfunc_t func; 204 unsigned long arg1; 205 unsigned long arg2; 206 unsigned long arg3; 207 unsigned long arg4; 208 unsigned long arg5; 209 unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */ 210 unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */ 211} ccall_info; 212 213static DEFINE_SPINLOCK(cross_call_lock); 214 215/* Cross calls must be serialized, at least currently. */ 216static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, 217 unsigned long arg2, unsigned long arg3, 218 unsigned long arg4) 219{ 220 register int ncpus = SUN4M_NCPUS; 221 unsigned long flags; 222 223 spin_lock_irqsave(&cross_call_lock, flags); 224 225 /* Init function glue. */ 226 ccall_info.func = func; 227 ccall_info.arg1 = arg1; 228 ccall_info.arg2 = arg2; 229 ccall_info.arg3 = arg3; 230 ccall_info.arg4 = arg4; 231 ccall_info.arg5 = 0; 232 233 /* Init receive/complete mapping, plus fire the IPI's off. */ 234 { 235 register int i; 236 237 cpu_clear(smp_processor_id(), mask); 238 cpus_and(mask, cpu_online_map, mask); 239 for(i = 0; i < ncpus; i++) { 240 if (cpu_isset(i, mask)) { 241 ccall_info.processors_in[i] = 0; 242 ccall_info.processors_out[i] = 0; 243 set_cpu_int(i, IRQ_CROSS_CALL); 244 } else { 245 ccall_info.processors_in[i] = 1; 246 ccall_info.processors_out[i] = 1; 247 } 248 } 249 } 250 251 { 252 register int i; 253 254 i = 0; 255 do { 256 if (!cpu_isset(i, mask)) 257 continue; 258 while(!ccall_info.processors_in[i]) 259 barrier(); 260 } while(++i < ncpus); 261 262 i = 0; 263 do { 264 if (!cpu_isset(i, mask)) 265 continue; 266 while(!ccall_info.processors_out[i]) 267 barrier(); 268 } while(++i < ncpus); 269 } 270 271 spin_unlock_irqrestore(&cross_call_lock, flags); 272} 273 274/* Running cross calls. */ 275void smp4m_cross_call_irq(void) 276{ 277 int i = smp_processor_id(); 278 279 ccall_info.processors_in[i] = 1; 280 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, 281 ccall_info.arg4, ccall_info.arg5); 282 ccall_info.processors_out[i] = 1; 283} 284 285extern void sun4m_clear_profile_irq(int cpu); 286 287void smp4m_percpu_timer_interrupt(struct pt_regs *regs) 288{ 289 struct pt_regs *old_regs; 290 int cpu = smp_processor_id(); 291 292 old_regs = set_irq_regs(regs); 293 294 sun4m_clear_profile_irq(cpu); 295 296 profile_tick(CPU_PROFILING); 297 298 if(!--prof_counter(cpu)) { 299 int user = user_mode(regs); 300 301 irq_enter(); 302 update_process_times(user); 303 irq_exit(); 304 305 prof_counter(cpu) = prof_multiplier(cpu); 306 } 307 set_irq_regs(old_regs); 308} 309 310extern unsigned int lvl14_resolution; 311 312static void __cpuinit smp_setup_percpu_timer(void) 313{ 314 int cpu = smp_processor_id(); 315 316 prof_counter(cpu) = prof_multiplier(cpu) = 1; 317 load_profile_irq(cpu, lvl14_resolution); 318 319 if(cpu == boot_cpu_id) 320 enable_pil_irq(14); 321} 322 323static void __init smp4m_blackbox_id(unsigned *addr) 324{ 325 int rd = *addr & 0x3e000000; 326 int rs1 = rd >> 11; 327 328 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ 329 addr[1] = 0x8130200c | rd | rs1; /* srl reg, 0xc, reg */ 330 addr[2] = 0x80082003 | rd | rs1; /* and reg, 3, reg */ 331} 332 333static void __init smp4m_blackbox_current(unsigned *addr) 334{ 335 int rd = *addr & 0x3e000000; 336 int rs1 = rd >> 11; 337 338 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ 339 addr[2] = 0x8130200a | rd | rs1; /* srl reg, 0xa, reg */ 340 addr[4] = 0x8008200c | rd | rs1; /* and reg, 0xc, reg */ 341} 342 343void __init sun4m_init_smp(void) 344{ 345 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id); 346 BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current); 347 BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM); 348 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM); 349} 350