Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Adrian Bunk | 6c81c32 | 2008-02-06 01:37:51 -0800 | [diff] [blame] | 19 | #include <linux/delay.h> |
Robert Reif | 4245e59 | 2008-10-12 20:52:26 -0700 | [diff] [blame] | 20 | #include <linux/cpu.h> |
Adrian Bunk | 6c81c32 | 2008-02-06 01:37:51 -0800 | [diff] [blame] | 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/cacheflush.h> |
| 23 | #include <asm/tlbflush.h> |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 24 | #include <asm/irq_regs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include <asm/ptrace.h> |
| 27 | #include <asm/atomic.h> |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Al Viro | 32231a6 | 2007-07-21 19:18:57 -0700 | [diff] [blame] | 36 | #include "irq.h" |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #define IRQ_CROSS_CALL 15 |
| 39 | |
| 40 | extern ctxd_t *srmmu_ctx_table_phys; |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | extern volatile unsigned long cpu_callin_map[NR_CPUS]; |
| 43 | extern unsigned char boot_cpu_id; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 44 | |
| 45 | extern cpumask_t smp_commenced_mask; |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Wu Fengguang | 1a8a27c | 2009-01-07 18:09:10 -0800 | [diff] [blame] | 57 | static inline unsigned long |
| 58 | swap_ulong(volatile unsigned long *ptr, unsigned long val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Bob Breuer | 92d452f | 2006-06-20 00:36:10 -0700 | [diff] [blame] | 69 | void __cpuinit smp4m_callin(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
| 71 | int cpuid = hard_smp_processor_id(); |
| 72 | |
| 73 | local_flush_cache_all(); |
| 74 | local_flush_tlb_all(); |
| 75 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 76 | notify_cpu_starting(cpuid); |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Wu Fengguang | 1a8a27c | 2009-01-07 18:09:10 -0800 | [diff] [blame] | 94 | swap_ulong(&cpu_callin_map[cpuid], 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 96 | /* XXX: What's up with all the flushes? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 111 | while (!cpu_isset(cpuid, smp_commenced_mask)) |
| 112 | mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | local_irq_enable(); |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 115 | |
Rusty Russell | fe73971 | 2009-03-16 14:40:22 +1030 | [diff] [blame] | 116 | set_cpu_online(cpuid, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | /* |
| 120 | * Cycle through the processors asking the PROM to start each one. |
| 121 | */ |
| 122 | |
| 123 | extern struct linux_prom_registers smp_penguin_ctable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | void __init smp4m_boot_cpus(void) |
| 126 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | smp_setup_percpu_timer(); |
| 128 | local_flush_cache_all(); |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Bob Breuer | 92d452f | 2006-06-20 00:36:10 -0700 | [diff] [blame] | 131 | int __cpuinit smp4m_boot_one_cpu(int i) |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 132 | { |
| 133 | extern unsigned long sun4m_cpu_startup; |
| 134 | unsigned long *entry = &sun4m_cpu_startup; |
| 135 | struct task_struct *p; |
| 136 | int timeout; |
| 137 | int cpu_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 139 | cpu_find_by_mid(i, &cpu_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 141 | /* Cook up an idler for this guy. */ |
| 142 | p = fork_idle(i); |
| 143 | current_set[i] = task_thread_info(p); |
| 144 | /* See trampoline.S for details... */ |
| 145 | entry += ((i-1) * 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 147 | /* |
| 148 | * Initialize the contexts table |
| 149 | * Since the call to prom_startcpu() trashes the structure, |
| 150 | * we need to re-initialize it for each cpu |
| 151 | */ |
| 152 | smp_penguin_ctable.which_io = 0; |
| 153 | smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; |
| 154 | smp_penguin_ctable.reg_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 156 | /* whirrr, whirrr, whirrrrrrrrr... */ |
| 157 | printk("Starting CPU %d at %p\n", i, entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | local_flush_cache_all(); |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 159 | prom_startcpu(cpu_node, |
| 160 | &smp_penguin_ctable, 0, (char *)entry); |
| 161 | |
| 162 | /* wheee... it's going... */ |
| 163 | for(timeout = 0; timeout < 10000; timeout++) { |
| 164 | if(cpu_callin_map[i]) |
| 165 | break; |
| 166 | udelay(200); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 169 | if (!(cpu_callin_map[i])) { |
| 170 | printk("Processor %d is stuck.\n", i); |
| 171 | return -ENODEV; |
| 172 | } |
| 173 | |
| 174 | local_flush_cache_all(); |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | void __init smp4m_smp_done(void) |
| 179 | { |
| 180 | int i, first; |
| 181 | int *prev; |
| 182 | |
| 183 | /* setup cpu list for irq rotation */ |
| 184 | first = 0; |
| 185 | prev = &first; |
Rusty Russell | ec7c14b | 2009-03-16 14:40:24 +1030 | [diff] [blame] | 186 | for_each_online_cpu(i) { |
| 187 | *prev = i; |
| 188 | prev = &cpu_data(i).next; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 189 | } |
| 190 | *prev = first; |
| 191 | local_flush_cache_all(); |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | /* Ok, they are spinning and ready to go. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | /* At each hardware IRQ, we get this called to forward IRQ reception |
| 197 | * to the next processor. The caller must disable the IRQ level being |
| 198 | * serviced globally so that there are no double interrupts received. |
| 199 | * |
| 200 | * XXX See sparc64 irq.c. |
| 201 | */ |
| 202 | void smp4m_irq_rotate(int cpu) |
| 203 | { |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 204 | int next = cpu_data(cpu).next; |
| 205 | if (next != cpu) |
| 206 | set_irq_udt(next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | static struct smp_funcall { |
| 210 | smpfunc_t func; |
| 211 | unsigned long arg1; |
| 212 | unsigned long arg2; |
| 213 | unsigned long arg3; |
| 214 | unsigned long arg4; |
| 215 | unsigned long arg5; |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 216 | unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */ |
| 217 | unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } ccall_info; |
| 219 | |
| 220 | static DEFINE_SPINLOCK(cross_call_lock); |
| 221 | |
| 222 | /* Cross calls must be serialized, at least currently. */ |
David S. Miller | 66e4f8c | 2008-08-27 20:03:22 -0700 | [diff] [blame] | 223 | static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, |
Adrian Bunk | c61c65c | 2008-06-05 11:40:58 -0700 | [diff] [blame] | 224 | unsigned long arg2, unsigned long arg3, |
David S. Miller | 66e4f8c | 2008-08-27 20:03:22 -0700 | [diff] [blame] | 225 | unsigned long arg4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | { |
Bob Breuer | a54123e | 2006-03-23 22:36:19 -0800 | [diff] [blame] | 227 | register int ncpus = SUN4M_NCPUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | unsigned long flags; |
| 229 | |
| 230 | spin_lock_irqsave(&cross_call_lock, flags); |
| 231 | |
| 232 | /* Init function glue. */ |
| 233 | ccall_info.func = func; |
| 234 | ccall_info.arg1 = arg1; |
| 235 | ccall_info.arg2 = arg2; |
| 236 | ccall_info.arg3 = arg3; |
| 237 | ccall_info.arg4 = arg4; |
David S. Miller | 66e4f8c | 2008-08-27 20:03:22 -0700 | [diff] [blame] | 238 | ccall_info.arg5 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | /* Init receive/complete mapping, plus fire the IPI's off. */ |
| 241 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | register int i; |
| 243 | |
| 244 | cpu_clear(smp_processor_id(), mask); |
David S. Miller | 66e4f8c | 2008-08-27 20:03:22 -0700 | [diff] [blame] | 245 | cpus_and(mask, cpu_online_map, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | for(i = 0; i < ncpus; i++) { |
| 247 | if (cpu_isset(i, mask)) { |
| 248 | ccall_info.processors_in[i] = 0; |
| 249 | ccall_info.processors_out[i] = 0; |
| 250 | set_cpu_int(i, IRQ_CROSS_CALL); |
| 251 | } else { |
| 252 | ccall_info.processors_in[i] = 1; |
| 253 | ccall_info.processors_out[i] = 1; |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | { |
| 259 | register int i; |
| 260 | |
| 261 | i = 0; |
| 262 | do { |
David S. Miller | 66e4f8c | 2008-08-27 20:03:22 -0700 | [diff] [blame] | 263 | if (!cpu_isset(i, mask)) |
| 264 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | while(!ccall_info.processors_in[i]) |
| 266 | barrier(); |
| 267 | } while(++i < ncpus); |
| 268 | |
| 269 | i = 0; |
| 270 | do { |
David S. Miller | 66e4f8c | 2008-08-27 20:03:22 -0700 | [diff] [blame] | 271 | if (!cpu_isset(i, mask)) |
| 272 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | while(!ccall_info.processors_out[i]) |
| 274 | barrier(); |
| 275 | } while(++i < ncpus); |
| 276 | } |
| 277 | |
| 278 | spin_unlock_irqrestore(&cross_call_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | /* Running cross calls. */ |
| 282 | void smp4m_cross_call_irq(void) |
| 283 | { |
| 284 | int i = smp_processor_id(); |
| 285 | |
| 286 | ccall_info.processors_in[i] = 1; |
| 287 | ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, |
| 288 | ccall_info.arg4, ccall_info.arg5); |
| 289 | ccall_info.processors_out[i] = 1; |
| 290 | } |
| 291 | |
David S. Miller | 1de937a | 2008-09-13 22:07:56 -0700 | [diff] [blame] | 292 | extern void sun4m_clear_profile_irq(int cpu); |
| 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | void smp4m_percpu_timer_interrupt(struct pt_regs *regs) |
| 295 | { |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 296 | struct pt_regs *old_regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | int cpu = smp_processor_id(); |
| 298 | |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 299 | old_regs = set_irq_regs(regs); |
| 300 | |
David S. Miller | 1de937a | 2008-09-13 22:07:56 -0700 | [diff] [blame] | 301 | sun4m_clear_profile_irq(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 303 | profile_tick(CPU_PROFILING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | if(!--prof_counter(cpu)) { |
| 306 | int user = user_mode(regs); |
| 307 | |
| 308 | irq_enter(); |
| 309 | update_process_times(user); |
| 310 | irq_exit(); |
| 311 | |
| 312 | prof_counter(cpu) = prof_multiplier(cpu); |
| 313 | } |
Al Viro | 0d84438 | 2006-10-08 14:30:44 +0100 | [diff] [blame] | 314 | set_irq_regs(old_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | extern unsigned int lvl14_resolution; |
| 318 | |
Al Viro | 409832f | 2008-11-22 17:33:54 +0000 | [diff] [blame] | 319 | static void __cpuinit smp_setup_percpu_timer(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
| 321 | int cpu = smp_processor_id(); |
| 322 | |
| 323 | prof_counter(cpu) = prof_multiplier(cpu) = 1; |
| 324 | load_profile_irq(cpu, lvl14_resolution); |
| 325 | |
| 326 | if(cpu == boot_cpu_id) |
| 327 | enable_pil_irq(14); |
| 328 | } |
| 329 | |
Adrian Bunk | c61c65c | 2008-06-05 11:40:58 -0700 | [diff] [blame] | 330 | static void __init smp4m_blackbox_id(unsigned *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | int rd = *addr & 0x3e000000; |
| 333 | int rs1 = rd >> 11; |
| 334 | |
| 335 | addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ |
| 336 | addr[1] = 0x8130200c | rd | rs1; /* srl reg, 0xc, reg */ |
| 337 | addr[2] = 0x80082003 | rd | rs1; /* and reg, 3, reg */ |
| 338 | } |
| 339 | |
Adrian Bunk | c61c65c | 2008-06-05 11:40:58 -0700 | [diff] [blame] | 340 | static void __init smp4m_blackbox_current(unsigned *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | { |
| 342 | int rd = *addr & 0x3e000000; |
| 343 | int rs1 = rd >> 11; |
| 344 | |
| 345 | addr[0] = 0x81580000 | rd; /* rd %tbr, reg */ |
| 346 | addr[2] = 0x8130200a | rd | rs1; /* srl reg, 0xa, reg */ |
David S. Miller | 4cad691 | 2007-04-30 17:59:50 -0700 | [diff] [blame] | 347 | addr[4] = 0x8008200c | rd | rs1; /* and reg, 0xc, reg */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | void __init sun4m_init_smp(void) |
| 351 | { |
| 352 | BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id); |
| 353 | BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current); |
| 354 | BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM); |
| 356 | } |