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Commit | Line | Data |
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1da177e4 LT |
1 | /* smp.c: Sparc64 SMP support. |
2 | * | |
cf3d7c1e | 3 | * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | */ |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/pagemap.h> | |
11 | #include <linux/threads.h> | |
12 | #include <linux/smp.h> | |
1da177e4 LT |
13 | #include <linux/interrupt.h> |
14 | #include <linux/kernel_stat.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/cache.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/profile.h> | |
b9709456 | 23 | #include <linux/lmb.h> |
1da177e4 LT |
24 | |
25 | #include <asm/head.h> | |
26 | #include <asm/ptrace.h> | |
27 | #include <asm/atomic.h> | |
28 | #include <asm/tlbflush.h> | |
29 | #include <asm/mmu_context.h> | |
30 | #include <asm/cpudata.h> | |
27a2ef38 DM |
31 | #include <asm/hvtramp.h> |
32 | #include <asm/io.h> | |
cf3d7c1e | 33 | #include <asm/timer.h> |
1da177e4 LT |
34 | |
35 | #include <asm/irq.h> | |
6d24c8dc | 36 | #include <asm/irq_regs.h> |
1da177e4 LT |
37 | #include <asm/page.h> |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/oplib.h> | |
40 | #include <asm/uaccess.h> | |
1da177e4 LT |
41 | #include <asm/starfire.h> |
42 | #include <asm/tlb.h> | |
56fb4df6 | 43 | #include <asm/sections.h> |
07f8e5f3 | 44 | #include <asm/prom.h> |
5cbc3073 | 45 | #include <asm/mdesc.h> |
4f0234f4 | 46 | #include <asm/ldc.h> |
e0204409 | 47 | #include <asm/hypervisor.h> |
1da177e4 | 48 | |
a2f9f6bb DM |
49 | int sparc64_multi_core __read_mostly; |
50 | ||
4f0234f4 | 51 | cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE; |
c12a8289 | 52 | cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE; |
d5a7430d | 53 | DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE; |
f78eae2e DM |
54 | cpumask_t cpu_core_map[NR_CPUS] __read_mostly = |
55 | { [0 ... NR_CPUS-1] = CPU_MASK_NONE }; | |
4f0234f4 DM |
56 | |
57 | EXPORT_SYMBOL(cpu_possible_map); | |
58 | EXPORT_SYMBOL(cpu_online_map); | |
d5a7430d | 59 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
4f0234f4 DM |
60 | EXPORT_SYMBOL(cpu_core_map); |
61 | ||
1da177e4 | 62 | static cpumask_t smp_commenced_mask; |
1da177e4 LT |
63 | |
64 | void smp_info(struct seq_file *m) | |
65 | { | |
66 | int i; | |
67 | ||
68 | seq_printf(m, "State:\n"); | |
394e3902 AM |
69 | for_each_online_cpu(i) |
70 | seq_printf(m, "CPU%d:\t\tonline\n", i); | |
1da177e4 LT |
71 | } |
72 | ||
73 | void smp_bogo(struct seq_file *m) | |
74 | { | |
75 | int i; | |
76 | ||
394e3902 AM |
77 | for_each_online_cpu(i) |
78 | seq_printf(m, | |
394e3902 | 79 | "Cpu%dClkTck\t: %016lx\n", |
394e3902 | 80 | i, cpu_data(i).clock_tick); |
1da177e4 LT |
81 | } |
82 | ||
e0204409 DM |
83 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock); |
84 | ||
112f4871 | 85 | extern void setup_sparc64_timer(void); |
1da177e4 LT |
86 | |
87 | static volatile unsigned long callin_flag = 0; | |
88 | ||
0f7f22d9 | 89 | void __cpuinit smp_callin(void) |
1da177e4 LT |
90 | { |
91 | int cpuid = hard_smp_processor_id(); | |
92 | ||
56fb4df6 | 93 | __local_per_cpu_offset = __per_cpu_offset(cpuid); |
1da177e4 | 94 | |
4a07e646 | 95 | if (tlb_type == hypervisor) |
490384e7 | 96 | sun4v_ktsb_register(); |
481295f9 | 97 | |
56fb4df6 | 98 | __flush_tlb_all(); |
1da177e4 | 99 | |
112f4871 | 100 | setup_sparc64_timer(); |
1da177e4 | 101 | |
816242da DM |
102 | if (cheetah_pcache_forced_on) |
103 | cheetah_enable_pcache(); | |
104 | ||
1da177e4 LT |
105 | local_irq_enable(); |
106 | ||
1da177e4 LT |
107 | callin_flag = 1; |
108 | __asm__ __volatile__("membar #Sync\n\t" | |
109 | "flush %%g6" : : : "memory"); | |
110 | ||
111 | /* Clear this or we will die instantly when we | |
112 | * schedule back to this idler... | |
113 | */ | |
db7d9a4e | 114 | current_thread_info()->new_child = 0; |
1da177e4 LT |
115 | |
116 | /* Attach to the address space of init_task. */ | |
117 | atomic_inc(&init_mm.mm_count); | |
118 | current->active_mm = &init_mm; | |
119 | ||
120 | while (!cpu_isset(cpuid, smp_commenced_mask)) | |
4f07118f | 121 | rmb(); |
1da177e4 | 122 | |
e0204409 | 123 | spin_lock(&call_lock); |
1da177e4 | 124 | cpu_set(cpuid, cpu_online_map); |
e0204409 | 125 | spin_unlock(&call_lock); |
5bfb5d69 NP |
126 | |
127 | /* idle thread is expected to have preempt disabled */ | |
128 | preempt_disable(); | |
1da177e4 LT |
129 | } |
130 | ||
131 | void cpu_panic(void) | |
132 | { | |
133 | printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); | |
134 | panic("SMP bolixed\n"); | |
135 | } | |
136 | ||
1da177e4 LT |
137 | /* This tick register synchronization scheme is taken entirely from |
138 | * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit. | |
139 | * | |
140 | * The only change I've made is to rework it so that the master | |
141 | * initiates the synchonization instead of the slave. -DaveM | |
142 | */ | |
143 | ||
144 | #define MASTER 0 | |
145 | #define SLAVE (SMP_CACHE_BYTES/sizeof(unsigned long)) | |
146 | ||
147 | #define NUM_ROUNDS 64 /* magic value */ | |
148 | #define NUM_ITERS 5 /* likewise */ | |
149 | ||
150 | static DEFINE_SPINLOCK(itc_sync_lock); | |
151 | static unsigned long go[SLAVE + 1]; | |
152 | ||
153 | #define DEBUG_TICK_SYNC 0 | |
154 | ||
155 | static inline long get_delta (long *rt, long *master) | |
156 | { | |
157 | unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; | |
158 | unsigned long tcenter, t0, t1, tm; | |
159 | unsigned long i; | |
160 | ||
161 | for (i = 0; i < NUM_ITERS; i++) { | |
162 | t0 = tick_ops->get_tick(); | |
163 | go[MASTER] = 1; | |
4f07118f | 164 | membar_storeload(); |
1da177e4 | 165 | while (!(tm = go[SLAVE])) |
4f07118f | 166 | rmb(); |
1da177e4 | 167 | go[SLAVE] = 0; |
4f07118f | 168 | wmb(); |
1da177e4 LT |
169 | t1 = tick_ops->get_tick(); |
170 | ||
171 | if (t1 - t0 < best_t1 - best_t0) | |
172 | best_t0 = t0, best_t1 = t1, best_tm = tm; | |
173 | } | |
174 | ||
175 | *rt = best_t1 - best_t0; | |
176 | *master = best_tm - best_t0; | |
177 | ||
178 | /* average best_t0 and best_t1 without overflow: */ | |
179 | tcenter = (best_t0/2 + best_t1/2); | |
180 | if (best_t0 % 2 + best_t1 % 2 == 2) | |
181 | tcenter++; | |
182 | return tcenter - best_tm; | |
183 | } | |
184 | ||
185 | void smp_synchronize_tick_client(void) | |
186 | { | |
187 | long i, delta, adj, adjust_latency = 0, done = 0; | |
188 | unsigned long flags, rt, master_time_stamp, bound; | |
189 | #if DEBUG_TICK_SYNC | |
190 | struct { | |
191 | long rt; /* roundtrip time */ | |
192 | long master; /* master's timestamp */ | |
193 | long diff; /* difference between midpoint and master's timestamp */ | |
194 | long lat; /* estimate of itc adjustment latency */ | |
195 | } t[NUM_ROUNDS]; | |
196 | #endif | |
197 | ||
198 | go[MASTER] = 1; | |
199 | ||
200 | while (go[MASTER]) | |
4f07118f | 201 | rmb(); |
1da177e4 LT |
202 | |
203 | local_irq_save(flags); | |
204 | { | |
205 | for (i = 0; i < NUM_ROUNDS; i++) { | |
206 | delta = get_delta(&rt, &master_time_stamp); | |
207 | if (delta == 0) { | |
208 | done = 1; /* let's lock on to this... */ | |
209 | bound = rt; | |
210 | } | |
211 | ||
212 | if (!done) { | |
213 | if (i > 0) { | |
214 | adjust_latency += -delta; | |
215 | adj = -delta + adjust_latency/4; | |
216 | } else | |
217 | adj = -delta; | |
218 | ||
112f4871 | 219 | tick_ops->add_tick(adj); |
1da177e4 LT |
220 | } |
221 | #if DEBUG_TICK_SYNC | |
222 | t[i].rt = rt; | |
223 | t[i].master = master_time_stamp; | |
224 | t[i].diff = delta; | |
225 | t[i].lat = adjust_latency/4; | |
226 | #endif | |
227 | } | |
228 | } | |
229 | local_irq_restore(flags); | |
230 | ||
231 | #if DEBUG_TICK_SYNC | |
232 | for (i = 0; i < NUM_ROUNDS; i++) | |
233 | printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", | |
234 | t[i].rt, t[i].master, t[i].diff, t[i].lat); | |
235 | #endif | |
236 | ||
519c4d2d JP |
237 | printk(KERN_INFO "CPU %d: synchronized TICK with master CPU " |
238 | "(last diff %ld cycles, maxerr %lu cycles)\n", | |
239 | smp_processor_id(), delta, rt); | |
1da177e4 LT |
240 | } |
241 | ||
242 | static void smp_start_sync_tick_client(int cpu); | |
243 | ||
244 | static void smp_synchronize_one_tick(int cpu) | |
245 | { | |
246 | unsigned long flags, i; | |
247 | ||
248 | go[MASTER] = 0; | |
249 | ||
250 | smp_start_sync_tick_client(cpu); | |
251 | ||
252 | /* wait for client to be ready */ | |
253 | while (!go[MASTER]) | |
4f07118f | 254 | rmb(); |
1da177e4 LT |
255 | |
256 | /* now let the client proceed into his loop */ | |
257 | go[MASTER] = 0; | |
4f07118f | 258 | membar_storeload(); |
1da177e4 LT |
259 | |
260 | spin_lock_irqsave(&itc_sync_lock, flags); | |
261 | { | |
262 | for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) { | |
263 | while (!go[MASTER]) | |
4f07118f | 264 | rmb(); |
1da177e4 | 265 | go[MASTER] = 0; |
4f07118f | 266 | wmb(); |
1da177e4 | 267 | go[SLAVE] = tick_ops->get_tick(); |
4f07118f | 268 | membar_storeload(); |
1da177e4 LT |
269 | } |
270 | } | |
271 | spin_unlock_irqrestore(&itc_sync_lock, flags); | |
272 | } | |
273 | ||
b14f5c10 | 274 | #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU) |
27a2ef38 DM |
275 | /* XXX Put this in some common place. XXX */ |
276 | static unsigned long kimage_addr_to_ra(void *p) | |
277 | { | |
278 | unsigned long val = (unsigned long) p; | |
279 | ||
280 | return kern_base + (val - KERNBASE); | |
281 | } | |
282 | ||
b14f5c10 DM |
283 | static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg) |
284 | { | |
285 | extern unsigned long sparc64_ttable_tl0; | |
286 | extern unsigned long kern_locked_tte_data; | |
b14f5c10 DM |
287 | struct hvtramp_descr *hdesc; |
288 | unsigned long trampoline_ra; | |
289 | struct trap_per_cpu *tb; | |
290 | u64 tte_vaddr, tte_data; | |
291 | unsigned long hv_err; | |
64658743 | 292 | int i; |
b14f5c10 | 293 | |
64658743 DM |
294 | hdesc = kzalloc(sizeof(*hdesc) + |
295 | (sizeof(struct hvtramp_mapping) * | |
296 | num_kernel_image_mappings - 1), | |
297 | GFP_KERNEL); | |
b14f5c10 | 298 | if (!hdesc) { |
27a2ef38 | 299 | printk(KERN_ERR "ldom_startcpu_cpuid: Cannot allocate " |
b14f5c10 DM |
300 | "hvtramp_descr.\n"); |
301 | return; | |
302 | } | |
303 | ||
304 | hdesc->cpu = cpu; | |
64658743 | 305 | hdesc->num_mappings = num_kernel_image_mappings; |
b14f5c10 DM |
306 | |
307 | tb = &trap_block[cpu]; | |
308 | tb->hdesc = hdesc; | |
309 | ||
310 | hdesc->fault_info_va = (unsigned long) &tb->fault_info; | |
311 | hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info); | |
312 | ||
313 | hdesc->thread_reg = thread_reg; | |
314 | ||
315 | tte_vaddr = (unsigned long) KERNBASE; | |
316 | tte_data = kern_locked_tte_data; | |
317 | ||
64658743 DM |
318 | for (i = 0; i < hdesc->num_mappings; i++) { |
319 | hdesc->maps[i].vaddr = tte_vaddr; | |
320 | hdesc->maps[i].tte = tte_data; | |
b14f5c10 DM |
321 | tte_vaddr += 0x400000; |
322 | tte_data += 0x400000; | |
b14f5c10 DM |
323 | } |
324 | ||
325 | trampoline_ra = kimage_addr_to_ra(hv_cpu_startup); | |
326 | ||
327 | hv_err = sun4v_cpu_start(cpu, trampoline_ra, | |
328 | kimage_addr_to_ra(&sparc64_ttable_tl0), | |
329 | __pa(hdesc)); | |
e0204409 DM |
330 | if (hv_err) |
331 | printk(KERN_ERR "ldom_startcpu_cpuid: sun4v_cpu_start() " | |
332 | "gives error %lu\n", hv_err); | |
b14f5c10 DM |
333 | } |
334 | #endif | |
335 | ||
1da177e4 LT |
336 | extern unsigned long sparc64_cpu_startup; |
337 | ||
338 | /* The OBP cpu startup callback truncates the 3rd arg cookie to | |
339 | * 32-bits (I think) so to be safe we have it read the pointer | |
340 | * contained here so we work on >4GB machines. -DaveM | |
341 | */ | |
342 | static struct thread_info *cpu_new_thread = NULL; | |
343 | ||
344 | static int __devinit smp_boot_one_cpu(unsigned int cpu) | |
345 | { | |
b37d40d1 | 346 | struct trap_per_cpu *tb = &trap_block[cpu]; |
1da177e4 LT |
347 | unsigned long entry = |
348 | (unsigned long)(&sparc64_cpu_startup); | |
349 | unsigned long cookie = | |
350 | (unsigned long)(&cpu_new_thread); | |
351 | struct task_struct *p; | |
7890f794 | 352 | int timeout, ret; |
1da177e4 LT |
353 | |
354 | p = fork_idle(cpu); | |
1177bf97 AM |
355 | if (IS_ERR(p)) |
356 | return PTR_ERR(p); | |
1da177e4 | 357 | callin_flag = 0; |
f3169641 | 358 | cpu_new_thread = task_thread_info(p); |
1da177e4 | 359 | |
7890f794 | 360 | if (tlb_type == hypervisor) { |
b14f5c10 | 361 | #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU) |
4f0234f4 DM |
362 | if (ldom_domaining_enabled) |
363 | ldom_startcpu_cpuid(cpu, | |
364 | (unsigned long) cpu_new_thread); | |
365 | else | |
366 | #endif | |
367 | prom_startcpu_cpuid(cpu, entry, cookie); | |
7890f794 | 368 | } else { |
5cbc3073 | 369 | struct device_node *dp = of_find_node_by_cpuid(cpu); |
7890f794 | 370 | |
07f8e5f3 | 371 | prom_startcpu(dp->node, entry, cookie); |
7890f794 | 372 | } |
1da177e4 | 373 | |
4f0234f4 | 374 | for (timeout = 0; timeout < 50000; timeout++) { |
1da177e4 LT |
375 | if (callin_flag) |
376 | break; | |
377 | udelay(100); | |
378 | } | |
72aff53f | 379 | |
1da177e4 LT |
380 | if (callin_flag) { |
381 | ret = 0; | |
382 | } else { | |
383 | printk("Processor %d is stuck.\n", cpu); | |
1da177e4 LT |
384 | ret = -ENODEV; |
385 | } | |
386 | cpu_new_thread = NULL; | |
387 | ||
b37d40d1 DM |
388 | if (tb->hdesc) { |
389 | kfree(tb->hdesc); | |
390 | tb->hdesc = NULL; | |
391 | } | |
392 | ||
1da177e4 LT |
393 | return ret; |
394 | } | |
395 | ||
396 | static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu) | |
397 | { | |
398 | u64 result, target; | |
399 | int stuck, tmp; | |
400 | ||
401 | if (this_is_starfire) { | |
402 | /* map to real upaid */ | |
403 | cpu = (((cpu & 0x3c) << 1) | | |
404 | ((cpu & 0x40) >> 4) | | |
405 | (cpu & 0x3)); | |
406 | } | |
407 | ||
408 | target = (cpu << 14) | 0x70; | |
409 | again: | |
410 | /* Ok, this is the real Spitfire Errata #54. | |
411 | * One must read back from a UDB internal register | |
412 | * after writes to the UDB interrupt dispatch, but | |
413 | * before the membar Sync for that write. | |
414 | * So we use the high UDB control register (ASI 0x7f, | |
415 | * ADDR 0x20) for the dummy read. -DaveM | |
416 | */ | |
417 | tmp = 0x40; | |
418 | __asm__ __volatile__( | |
419 | "wrpr %1, %2, %%pstate\n\t" | |
420 | "stxa %4, [%0] %3\n\t" | |
421 | "stxa %5, [%0+%8] %3\n\t" | |
422 | "add %0, %8, %0\n\t" | |
423 | "stxa %6, [%0+%8] %3\n\t" | |
424 | "membar #Sync\n\t" | |
425 | "stxa %%g0, [%7] %3\n\t" | |
426 | "membar #Sync\n\t" | |
427 | "mov 0x20, %%g1\n\t" | |
428 | "ldxa [%%g1] 0x7f, %%g0\n\t" | |
429 | "membar #Sync" | |
430 | : "=r" (tmp) | |
431 | : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W), | |
432 | "r" (data0), "r" (data1), "r" (data2), "r" (target), | |
433 | "r" (0x10), "0" (tmp) | |
434 | : "g1"); | |
435 | ||
436 | /* NOTE: PSTATE_IE is still clear. */ | |
437 | stuck = 100000; | |
438 | do { | |
439 | __asm__ __volatile__("ldxa [%%g0] %1, %0" | |
440 | : "=r" (result) | |
441 | : "i" (ASI_INTR_DISPATCH_STAT)); | |
442 | if (result == 0) { | |
443 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" | |
444 | : : "r" (pstate)); | |
445 | return; | |
446 | } | |
447 | stuck -= 1; | |
448 | if (stuck == 0) | |
449 | break; | |
450 | } while (result & 0x1); | |
451 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" | |
452 | : : "r" (pstate)); | |
453 | if (stuck == 0) { | |
454 | printk("CPU[%d]: mondo stuckage result[%016lx]\n", | |
455 | smp_processor_id(), result); | |
456 | } else { | |
457 | udelay(2); | |
458 | goto again; | |
459 | } | |
460 | } | |
461 | ||
90f7ae8a | 462 | static void spitfire_xcall_deliver(struct trap_per_cpu *tb, int cnt) |
1da177e4 | 463 | { |
90f7ae8a DM |
464 | u64 *mondo, data0, data1, data2; |
465 | u16 *cpu_list; | |
1da177e4 LT |
466 | u64 pstate; |
467 | int i; | |
468 | ||
469 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); | |
90f7ae8a DM |
470 | cpu_list = __va(tb->cpu_list_pa); |
471 | mondo = __va(tb->cpu_mondo_block_pa); | |
472 | data0 = mondo[0]; | |
473 | data1 = mondo[1]; | |
474 | data2 = mondo[2]; | |
475 | for (i = 0; i < cnt; i++) | |
476 | spitfire_xcall_helper(data0, data1, data2, pstate, cpu_list[i]); | |
1da177e4 LT |
477 | } |
478 | ||
479 | /* Cheetah now allows to send the whole 64-bytes of data in the interrupt | |
480 | * packet, but we have no use for that. However we do take advantage of | |
481 | * the new pipelining feature (ie. dispatch to multiple cpus simultaneously). | |
482 | */ | |
90f7ae8a | 483 | static void cheetah_xcall_deliver(struct trap_per_cpu *tb, int cnt) |
1da177e4 | 484 | { |
22adb358 | 485 | int nack_busy_id, is_jbus, need_more; |
90f7ae8a DM |
486 | u64 *mondo, pstate, ver, busy_mask; |
487 | u16 *cpu_list; | |
1da177e4 | 488 | |
90f7ae8a DM |
489 | cpu_list = __va(tb->cpu_list_pa); |
490 | mondo = __va(tb->cpu_mondo_block_pa); | |
cd5bc89d | 491 | |
1da177e4 LT |
492 | /* Unfortunately, someone at Sun had the brilliant idea to make the |
493 | * busy/nack fields hard-coded by ITID number for this Ultra-III | |
494 | * derivative processor. | |
495 | */ | |
496 | __asm__ ("rdpr %%ver, %0" : "=r" (ver)); | |
92704a1c DM |
497 | is_jbus = ((ver >> 32) == __JALAPENO_ID || |
498 | (ver >> 32) == __SERRANO_ID); | |
1da177e4 LT |
499 | |
500 | __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); | |
501 | ||
502 | retry: | |
22adb358 | 503 | need_more = 0; |
1da177e4 LT |
504 | __asm__ __volatile__("wrpr %0, %1, %%pstate\n\t" |
505 | : : "r" (pstate), "i" (PSTATE_IE)); | |
506 | ||
507 | /* Setup the dispatch data registers. */ | |
508 | __asm__ __volatile__("stxa %0, [%3] %6\n\t" | |
509 | "stxa %1, [%4] %6\n\t" | |
510 | "stxa %2, [%5] %6\n\t" | |
511 | "membar #Sync\n\t" | |
512 | : /* no outputs */ | |
90f7ae8a | 513 | : "r" (mondo[0]), "r" (mondo[1]), "r" (mondo[2]), |
1da177e4 LT |
514 | "r" (0x40), "r" (0x50), "r" (0x60), |
515 | "i" (ASI_INTR_W)); | |
516 | ||
517 | nack_busy_id = 0; | |
0de56d1a | 518 | busy_mask = 0; |
1da177e4 LT |
519 | { |
520 | int i; | |
521 | ||
90f7ae8a DM |
522 | for (i = 0; i < cnt; i++) { |
523 | u64 target, nr; | |
524 | ||
525 | nr = cpu_list[i]; | |
526 | if (nr == 0xffff) | |
527 | continue; | |
1da177e4 | 528 | |
90f7ae8a | 529 | target = (nr << 14) | 0x70; |
0de56d1a | 530 | if (is_jbus) { |
90f7ae8a | 531 | busy_mask |= (0x1UL << (nr * 2)); |
0de56d1a | 532 | } else { |
1da177e4 | 533 | target |= (nack_busy_id << 24); |
0de56d1a DM |
534 | busy_mask |= (0x1UL << |
535 | (nack_busy_id * 2)); | |
536 | } | |
1da177e4 LT |
537 | __asm__ __volatile__( |
538 | "stxa %%g0, [%0] %1\n\t" | |
539 | "membar #Sync\n\t" | |
540 | : /* no outputs */ | |
541 | : "r" (target), "i" (ASI_INTR_W)); | |
542 | nack_busy_id++; | |
22adb358 DM |
543 | if (nack_busy_id == 32) { |
544 | need_more = 1; | |
545 | break; | |
546 | } | |
1da177e4 LT |
547 | } |
548 | } | |
549 | ||
550 | /* Now, poll for completion. */ | |
551 | { | |
0de56d1a | 552 | u64 dispatch_stat, nack_mask; |
1da177e4 LT |
553 | long stuck; |
554 | ||
555 | stuck = 100000 * nack_busy_id; | |
0de56d1a | 556 | nack_mask = busy_mask << 1; |
1da177e4 LT |
557 | do { |
558 | __asm__ __volatile__("ldxa [%%g0] %1, %0" | |
559 | : "=r" (dispatch_stat) | |
560 | : "i" (ASI_INTR_DISPATCH_STAT)); | |
0de56d1a | 561 | if (!(dispatch_stat & (busy_mask | nack_mask))) { |
1da177e4 LT |
562 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" |
563 | : : "r" (pstate)); | |
22adb358 | 564 | if (unlikely(need_more)) { |
90f7ae8a DM |
565 | int i, this_cnt = 0; |
566 | for (i = 0; i < cnt; i++) { | |
567 | if (cpu_list[i] == 0xffff) | |
568 | continue; | |
569 | cpu_list[i] = 0xffff; | |
570 | this_cnt++; | |
571 | if (this_cnt == 32) | |
22adb358 DM |
572 | break; |
573 | } | |
574 | goto retry; | |
575 | } | |
1da177e4 LT |
576 | return; |
577 | } | |
578 | if (!--stuck) | |
579 | break; | |
0de56d1a | 580 | } while (dispatch_stat & busy_mask); |
1da177e4 LT |
581 | |
582 | __asm__ __volatile__("wrpr %0, 0x0, %%pstate" | |
583 | : : "r" (pstate)); | |
584 | ||
0de56d1a | 585 | if (dispatch_stat & busy_mask) { |
1da177e4 LT |
586 | /* Busy bits will not clear, continue instead |
587 | * of freezing up on this cpu. | |
588 | */ | |
589 | printk("CPU[%d]: mondo stuckage result[%016lx]\n", | |
590 | smp_processor_id(), dispatch_stat); | |
591 | } else { | |
592 | int i, this_busy_nack = 0; | |
593 | ||
594 | /* Delay some random time with interrupts enabled | |
595 | * to prevent deadlock. | |
596 | */ | |
597 | udelay(2 * nack_busy_id); | |
598 | ||
599 | /* Clear out the mask bits for cpus which did not | |
600 | * NACK us. | |
601 | */ | |
90f7ae8a DM |
602 | for (i = 0; i < cnt; i++) { |
603 | u64 check_mask, nr; | |
604 | ||
605 | nr = cpu_list[i]; | |
606 | if (nr == 0xffff) | |
607 | continue; | |
1da177e4 | 608 | |
92704a1c | 609 | if (is_jbus) |
90f7ae8a | 610 | check_mask = (0x2UL << (2*nr)); |
1da177e4 LT |
611 | else |
612 | check_mask = (0x2UL << | |
613 | this_busy_nack); | |
614 | if ((dispatch_stat & check_mask) == 0) | |
90f7ae8a | 615 | cpu_list[i] = 0xffff; |
1da177e4 | 616 | this_busy_nack += 2; |
22adb358 DM |
617 | if (this_busy_nack == 64) |
618 | break; | |
1da177e4 LT |
619 | } |
620 | ||
621 | goto retry; | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
1d2f1f90 | 626 | /* Multi-cpu list version. */ |
90f7ae8a | 627 | static void hypervisor_xcall_deliver(struct trap_per_cpu *tb, int cnt) |
a43fe0e7 | 628 | { |
ed4d9c66 | 629 | int retries, this_cpu, prev_sent, i, saw_cpu_error; |
c02a5119 | 630 | unsigned long status; |
b830ab66 | 631 | u16 *cpu_list; |
17f34f0e | 632 | |
b830ab66 | 633 | this_cpu = smp_processor_id(); |
1d2f1f90 | 634 | |
b830ab66 DM |
635 | cpu_list = __va(tb->cpu_list_pa); |
636 | ||
ed4d9c66 | 637 | saw_cpu_error = 0; |
1d2f1f90 | 638 | retries = 0; |
3cab0c3e | 639 | prev_sent = 0; |
1d2f1f90 | 640 | do { |
3cab0c3e | 641 | int forward_progress, n_sent; |
1d2f1f90 | 642 | |
b830ab66 DM |
643 | status = sun4v_cpu_mondo_send(cnt, |
644 | tb->cpu_list_pa, | |
645 | tb->cpu_mondo_block_pa); | |
646 | ||
647 | /* HV_EOK means all cpus received the xcall, we're done. */ | |
648 | if (likely(status == HV_EOK)) | |
1d2f1f90 | 649 | break; |
b830ab66 | 650 | |
3cab0c3e DM |
651 | /* First, see if we made any forward progress. |
652 | * | |
653 | * The hypervisor indicates successful sends by setting | |
654 | * cpu list entries to the value 0xffff. | |
b830ab66 | 655 | */ |
3cab0c3e | 656 | n_sent = 0; |
b830ab66 | 657 | for (i = 0; i < cnt; i++) { |
3cab0c3e DM |
658 | if (likely(cpu_list[i] == 0xffff)) |
659 | n_sent++; | |
1d2f1f90 DM |
660 | } |
661 | ||
3cab0c3e DM |
662 | forward_progress = 0; |
663 | if (n_sent > prev_sent) | |
664 | forward_progress = 1; | |
665 | ||
666 | prev_sent = n_sent; | |
667 | ||
b830ab66 DM |
668 | /* If we get a HV_ECPUERROR, then one or more of the cpus |
669 | * in the list are in error state. Use the cpu_state() | |
670 | * hypervisor call to find out which cpus are in error state. | |
671 | */ | |
672 | if (unlikely(status == HV_ECPUERROR)) { | |
673 | for (i = 0; i < cnt; i++) { | |
674 | long err; | |
675 | u16 cpu; | |
676 | ||
677 | cpu = cpu_list[i]; | |
678 | if (cpu == 0xffff) | |
679 | continue; | |
680 | ||
681 | err = sun4v_cpu_state(cpu); | |
ed4d9c66 DM |
682 | if (err == HV_CPU_STATE_ERROR) { |
683 | saw_cpu_error = (cpu + 1); | |
3cab0c3e | 684 | cpu_list[i] = 0xffff; |
b830ab66 DM |
685 | } |
686 | } | |
687 | } else if (unlikely(status != HV_EWOULDBLOCK)) | |
688 | goto fatal_mondo_error; | |
689 | ||
3cab0c3e DM |
690 | /* Don't bother rewriting the CPU list, just leave the |
691 | * 0xffff and non-0xffff entries in there and the | |
692 | * hypervisor will do the right thing. | |
693 | * | |
694 | * Only advance timeout state if we didn't make any | |
695 | * forward progress. | |
696 | */ | |
b830ab66 DM |
697 | if (unlikely(!forward_progress)) { |
698 | if (unlikely(++retries > 10000)) | |
699 | goto fatal_mondo_timeout; | |
700 | ||
701 | /* Delay a little bit to let other cpus catch up | |
702 | * on their cpu mondo queue work. | |
703 | */ | |
704 | udelay(2 * cnt); | |
705 | } | |
1d2f1f90 DM |
706 | } while (1); |
707 | ||
ed4d9c66 | 708 | if (unlikely(saw_cpu_error)) |
b830ab66 DM |
709 | goto fatal_mondo_cpu_error; |
710 | ||
711 | return; | |
712 | ||
713 | fatal_mondo_cpu_error: | |
714 | printk(KERN_CRIT "CPU[%d]: SUN4V mondo cpu error, some target cpus " | |
ed4d9c66 DM |
715 | "(including %d) were in error state\n", |
716 | this_cpu, saw_cpu_error - 1); | |
b830ab66 DM |
717 | return; |
718 | ||
719 | fatal_mondo_timeout: | |
b830ab66 DM |
720 | printk(KERN_CRIT "CPU[%d]: SUN4V mondo timeout, no forward " |
721 | " progress after %d retries.\n", | |
722 | this_cpu, retries); | |
723 | goto dump_cpu_list_and_out; | |
724 | ||
725 | fatal_mondo_error: | |
b830ab66 DM |
726 | printk(KERN_CRIT "CPU[%d]: Unexpected SUN4V mondo error %lu\n", |
727 | this_cpu, status); | |
728 | printk(KERN_CRIT "CPU[%d]: Args were cnt(%d) cpulist_pa(%lx) " | |
729 | "mondo_block_pa(%lx)\n", | |
730 | this_cpu, cnt, tb->cpu_list_pa, tb->cpu_mondo_block_pa); | |
731 | ||
732 | dump_cpu_list_and_out: | |
733 | printk(KERN_CRIT "CPU[%d]: CPU list [ ", this_cpu); | |
734 | for (i = 0; i < cnt; i++) | |
735 | printk("%u ", cpu_list[i]); | |
736 | printk("]\n"); | |
1d2f1f90 | 737 | } |
a43fe0e7 | 738 | |
90f7ae8a | 739 | static void (*xcall_deliver_impl)(struct trap_per_cpu *, int); |
deb16999 DM |
740 | |
741 | static void xcall_deliver(u64 data0, u64 data1, u64 data2, const cpumask_t *mask) | |
742 | { | |
90f7ae8a DM |
743 | struct trap_per_cpu *tb; |
744 | int this_cpu, i, cnt; | |
c02a5119 | 745 | unsigned long flags; |
90f7ae8a DM |
746 | u16 *cpu_list; |
747 | u64 *mondo; | |
c02a5119 DM |
748 | |
749 | /* We have to do this whole thing with interrupts fully disabled. | |
750 | * Otherwise if we send an xcall from interrupt context it will | |
751 | * corrupt both our mondo block and cpu list state. | |
752 | * | |
753 | * One consequence of this is that we cannot use timeout mechanisms | |
754 | * that depend upon interrupts being delivered locally. So, for | |
755 | * example, we cannot sample jiffies and expect it to advance. | |
756 | * | |
757 | * Fortunately, udelay() uses %stick/%tick so we can use that. | |
758 | */ | |
759 | local_irq_save(flags); | |
90f7ae8a DM |
760 | |
761 | this_cpu = smp_processor_id(); | |
762 | tb = &trap_block[this_cpu]; | |
763 | ||
764 | mondo = __va(tb->cpu_mondo_block_pa); | |
765 | mondo[0] = data0; | |
766 | mondo[1] = data1; | |
767 | mondo[2] = data2; | |
768 | wmb(); | |
769 | ||
770 | cpu_list = __va(tb->cpu_list_pa); | |
771 | ||
772 | /* Setup the initial cpu list. */ | |
773 | cnt = 0; | |
774 | for_each_cpu_mask_nr(i, *mask) { | |
775 | if (i == this_cpu || !cpu_online(i)) | |
776 | continue; | |
777 | cpu_list[cnt++] = i; | |
778 | } | |
779 | ||
780 | if (cnt) | |
781 | xcall_deliver_impl(tb, cnt); | |
782 | ||
c02a5119 | 783 | local_irq_restore(flags); |
deb16999 | 784 | } |
5e0797e5 | 785 | |
91a4231c DM |
786 | /* Send cross call to all processors mentioned in MASK_P |
787 | * except self. Really, there are only two cases currently, | |
788 | * "&cpu_online_map" and "&mm->cpu_vm_mask". | |
1da177e4 | 789 | */ |
ae583885 | 790 | static void smp_cross_call_masked(unsigned long *func, u32 ctx, u64 data1, u64 data2, const cpumask_t *mask) |
1da177e4 LT |
791 | { |
792 | u64 data0 = (((u64)ctx)<<32 | (((u64)func) & 0xffffffff)); | |
1da177e4 | 793 | |
ae583885 DM |
794 | xcall_deliver(data0, data1, data2, mask); |
795 | } | |
1da177e4 | 796 | |
ae583885 DM |
797 | /* Send cross call to all processors except self. */ |
798 | static void smp_cross_call(unsigned long *func, u32 ctx, u64 data1, u64 data2) | |
799 | { | |
800 | smp_cross_call_masked(func, ctx, data1, data2, &cpu_online_map); | |
1da177e4 LT |
801 | } |
802 | ||
803 | extern unsigned long xcall_sync_tick; | |
804 | ||
805 | static void smp_start_sync_tick_client(int cpu) | |
806 | { | |
24445a4a DM |
807 | xcall_deliver((u64) &xcall_sync_tick, 0, 0, |
808 | &cpumask_of_cpu(cpu)); | |
1da177e4 LT |
809 | } |
810 | ||
1da177e4 LT |
811 | extern unsigned long xcall_call_function; |
812 | ||
d172ad18 | 813 | void arch_send_call_function_ipi(cpumask_t mask) |
1da177e4 | 814 | { |
19926630 | 815 | xcall_deliver((u64) &xcall_call_function, 0, 0, &mask); |
d172ad18 | 816 | } |
1da177e4 | 817 | |
d172ad18 | 818 | extern unsigned long xcall_call_function_single; |
1da177e4 | 819 | |
d172ad18 DM |
820 | void arch_send_call_function_single_ipi(int cpu) |
821 | { | |
19926630 DM |
822 | xcall_deliver((u64) &xcall_call_function_single, 0, 0, |
823 | &cpumask_of_cpu(cpu)); | |
1da177e4 LT |
824 | } |
825 | ||
826 | void smp_call_function_client(int irq, struct pt_regs *regs) | |
827 | { | |
d172ad18 DM |
828 | clear_softint(1 << irq); |
829 | generic_smp_call_function_interrupt(); | |
830 | } | |
1da177e4 | 831 | |
d172ad18 DM |
832 | void smp_call_function_single_client(int irq, struct pt_regs *regs) |
833 | { | |
1da177e4 | 834 | clear_softint(1 << irq); |
d172ad18 | 835 | generic_smp_call_function_single_interrupt(); |
1da177e4 LT |
836 | } |
837 | ||
bd40791e DM |
838 | static void tsb_sync(void *info) |
839 | { | |
6f25f398 | 840 | struct trap_per_cpu *tp = &trap_block[raw_smp_processor_id()]; |
bd40791e DM |
841 | struct mm_struct *mm = info; |
842 | ||
6f25f398 DM |
843 | /* It is not valid to test "currrent->active_mm == mm" here. |
844 | * | |
845 | * The value of "current" is not changed atomically with | |
846 | * switch_mm(). But that's OK, we just need to check the | |
847 | * current cpu's trap block PGD physical address. | |
848 | */ | |
849 | if (tp->pgd_paddr == __pa(mm->pgd)) | |
bd40791e DM |
850 | tsb_context_switch(mm); |
851 | } | |
852 | ||
853 | void smp_tsb_sync(struct mm_struct *mm) | |
854 | { | |
d172ad18 | 855 | smp_call_function_mask(mm->cpu_vm_mask, tsb_sync, mm, 1); |
bd40791e DM |
856 | } |
857 | ||
1da177e4 LT |
858 | extern unsigned long xcall_flush_tlb_mm; |
859 | extern unsigned long xcall_flush_tlb_pending; | |
860 | extern unsigned long xcall_flush_tlb_kernel_range; | |
93dae5b7 | 861 | extern unsigned long xcall_fetch_glob_regs; |
1da177e4 | 862 | extern unsigned long xcall_receive_signal; |
ee29074d | 863 | extern unsigned long xcall_new_mmu_context_version; |
e2fdd7fd DM |
864 | #ifdef CONFIG_KGDB |
865 | extern unsigned long xcall_kgdb_capture; | |
866 | #endif | |
1da177e4 LT |
867 | |
868 | #ifdef DCACHE_ALIASING_POSSIBLE | |
869 | extern unsigned long xcall_flush_dcache_page_cheetah; | |
870 | #endif | |
871 | extern unsigned long xcall_flush_dcache_page_spitfire; | |
872 | ||
873 | #ifdef CONFIG_DEBUG_DCFLUSH | |
874 | extern atomic_t dcpage_flushes; | |
875 | extern atomic_t dcpage_flushes_xcall; | |
876 | #endif | |
877 | ||
d979f179 | 878 | static inline void __local_flush_dcache_page(struct page *page) |
1da177e4 LT |
879 | { |
880 | #ifdef DCACHE_ALIASING_POSSIBLE | |
881 | __flush_dcache_page(page_address(page), | |
882 | ((tlb_type == spitfire) && | |
883 | page_mapping(page) != NULL)); | |
884 | #else | |
885 | if (page_mapping(page) != NULL && | |
886 | tlb_type == spitfire) | |
887 | __flush_icache_page(__pa(page_address(page))); | |
888 | #endif | |
889 | } | |
890 | ||
891 | void smp_flush_dcache_page_impl(struct page *page, int cpu) | |
892 | { | |
a43fe0e7 DM |
893 | int this_cpu; |
894 | ||
895 | if (tlb_type == hypervisor) | |
896 | return; | |
1da177e4 LT |
897 | |
898 | #ifdef CONFIG_DEBUG_DCFLUSH | |
899 | atomic_inc(&dcpage_flushes); | |
900 | #endif | |
a43fe0e7 DM |
901 | |
902 | this_cpu = get_cpu(); | |
903 | ||
1da177e4 LT |
904 | if (cpu == this_cpu) { |
905 | __local_flush_dcache_page(page); | |
906 | } else if (cpu_online(cpu)) { | |
907 | void *pg_addr = page_address(page); | |
622824db | 908 | u64 data0 = 0; |
1da177e4 LT |
909 | |
910 | if (tlb_type == spitfire) { | |
622824db | 911 | data0 = ((u64)&xcall_flush_dcache_page_spitfire); |
1da177e4 LT |
912 | if (page_mapping(page) != NULL) |
913 | data0 |= ((u64)1 << 32); | |
a43fe0e7 | 914 | } else if (tlb_type == cheetah || tlb_type == cheetah_plus) { |
1da177e4 | 915 | #ifdef DCACHE_ALIASING_POSSIBLE |
622824db | 916 | data0 = ((u64)&xcall_flush_dcache_page_cheetah); |
1da177e4 LT |
917 | #endif |
918 | } | |
622824db DM |
919 | if (data0) { |
920 | xcall_deliver(data0, __pa(pg_addr), | |
ae583885 | 921 | (u64) pg_addr, &cpumask_of_cpu(cpu)); |
1da177e4 | 922 | #ifdef CONFIG_DEBUG_DCFLUSH |
622824db | 923 | atomic_inc(&dcpage_flushes_xcall); |
1da177e4 | 924 | #endif |
622824db | 925 | } |
1da177e4 LT |
926 | } |
927 | ||
928 | put_cpu(); | |
929 | } | |
930 | ||
931 | void flush_dcache_page_all(struct mm_struct *mm, struct page *page) | |
932 | { | |
622824db | 933 | void *pg_addr; |
a43fe0e7 | 934 | int this_cpu; |
622824db | 935 | u64 data0; |
a43fe0e7 DM |
936 | |
937 | if (tlb_type == hypervisor) | |
938 | return; | |
939 | ||
940 | this_cpu = get_cpu(); | |
1da177e4 | 941 | |
1da177e4 LT |
942 | #ifdef CONFIG_DEBUG_DCFLUSH |
943 | atomic_inc(&dcpage_flushes); | |
944 | #endif | |
622824db DM |
945 | data0 = 0; |
946 | pg_addr = page_address(page); | |
1da177e4 LT |
947 | if (tlb_type == spitfire) { |
948 | data0 = ((u64)&xcall_flush_dcache_page_spitfire); | |
949 | if (page_mapping(page) != NULL) | |
950 | data0 |= ((u64)1 << 32); | |
a43fe0e7 | 951 | } else if (tlb_type == cheetah || tlb_type == cheetah_plus) { |
1da177e4 LT |
952 | #ifdef DCACHE_ALIASING_POSSIBLE |
953 | data0 = ((u64)&xcall_flush_dcache_page_cheetah); | |
1da177e4 LT |
954 | #endif |
955 | } | |
622824db DM |
956 | if (data0) { |
957 | xcall_deliver(data0, __pa(pg_addr), | |
ae583885 | 958 | (u64) pg_addr, &cpu_online_map); |
1da177e4 | 959 | #ifdef CONFIG_DEBUG_DCFLUSH |
622824db | 960 | atomic_inc(&dcpage_flushes_xcall); |
1da177e4 | 961 | #endif |
622824db | 962 | } |
1da177e4 LT |
963 | __local_flush_dcache_page(page); |
964 | ||
965 | put_cpu(); | |
966 | } | |
967 | ||
ee29074d | 968 | void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs) |
1da177e4 | 969 | { |
a0663a79 | 970 | struct mm_struct *mm; |
ee29074d | 971 | unsigned long flags; |
a0663a79 | 972 | |
1da177e4 | 973 | clear_softint(1 << irq); |
a0663a79 DM |
974 | |
975 | /* See if we need to allocate a new TLB context because | |
976 | * the version of the one we are using is now out of date. | |
977 | */ | |
978 | mm = current->active_mm; | |
ee29074d DM |
979 | if (unlikely(!mm || (mm == &init_mm))) |
980 | return; | |
a0663a79 | 981 | |
ee29074d | 982 | spin_lock_irqsave(&mm->context.lock, flags); |
aac0aadf | 983 | |
ee29074d DM |
984 | if (unlikely(!CTX_VALID(mm->context))) |
985 | get_new_mmu_context(mm); | |
aac0aadf | 986 | |
ee29074d | 987 | spin_unlock_irqrestore(&mm->context.lock, flags); |
aac0aadf | 988 | |
ee29074d DM |
989 | load_secondary_context(mm); |
990 | __flush_tlb_mm(CTX_HWBITS(mm->context), | |
991 | SECONDARY_CONTEXT); | |
a0663a79 DM |
992 | } |
993 | ||
994 | void smp_new_mmu_context_version(void) | |
995 | { | |
ee29074d | 996 | smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0); |
1da177e4 LT |
997 | } |
998 | ||
e2fdd7fd DM |
999 | #ifdef CONFIG_KGDB |
1000 | void kgdb_roundup_cpus(unsigned long flags) | |
1001 | { | |
1002 | smp_cross_call(&xcall_kgdb_capture, 0, 0, 0); | |
1003 | } | |
1004 | #endif | |
1005 | ||
93dae5b7 DM |
1006 | void smp_fetch_global_regs(void) |
1007 | { | |
1008 | smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0); | |
1009 | } | |
93dae5b7 | 1010 | |
1da177e4 LT |
1011 | /* We know that the window frames of the user have been flushed |
1012 | * to the stack before we get here because all callers of us | |
1013 | * are flush_tlb_*() routines, and these run after flush_cache_*() | |
1014 | * which performs the flushw. | |
1015 | * | |
1016 | * The SMP TLB coherency scheme we use works as follows: | |
1017 | * | |
1018 | * 1) mm->cpu_vm_mask is a bit mask of which cpus an address | |
1019 | * space has (potentially) executed on, this is the heuristic | |
1020 | * we use to avoid doing cross calls. | |
1021 | * | |
1022 | * Also, for flushing from kswapd and also for clones, we | |
1023 | * use cpu_vm_mask as the list of cpus to make run the TLB. | |
1024 | * | |
1025 | * 2) TLB context numbers are shared globally across all processors | |
1026 | * in the system, this allows us to play several games to avoid | |
1027 | * cross calls. | |
1028 | * | |
1029 | * One invariant is that when a cpu switches to a process, and | |
1030 | * that processes tsk->active_mm->cpu_vm_mask does not have the | |
1031 | * current cpu's bit set, that tlb context is flushed locally. | |
1032 | * | |
1033 | * If the address space is non-shared (ie. mm->count == 1) we avoid | |
1034 | * cross calls when we want to flush the currently running process's | |
1035 | * tlb state. This is done by clearing all cpu bits except the current | |
1036 | * processor's in current->active_mm->cpu_vm_mask and performing the | |
1037 | * flush locally only. This will force any subsequent cpus which run | |
1038 | * this task to flush the context from the local tlb if the process | |
1039 | * migrates to another cpu (again). | |
1040 | * | |
1041 | * 3) For shared address spaces (threads) and swapping we bite the | |
1042 | * bullet for most cases and perform the cross call (but only to | |
1043 | * the cpus listed in cpu_vm_mask). | |
1044 | * | |
1045 | * The performance gain from "optimizing" away the cross call for threads is | |
1046 | * questionable (in theory the big win for threads is the massive sharing of | |
1047 | * address space state across processors). | |
1048 | */ | |
62dbec78 DM |
1049 | |
1050 | /* This currently is only used by the hugetlb arch pre-fault | |
1051 | * hook on UltraSPARC-III+ and later when changing the pagesize | |
1052 | * bits of the context register for an address space. | |
1053 | */ | |
1da177e4 LT |
1054 | void smp_flush_tlb_mm(struct mm_struct *mm) |
1055 | { | |
62dbec78 DM |
1056 | u32 ctx = CTX_HWBITS(mm->context); |
1057 | int cpu = get_cpu(); | |
1da177e4 | 1058 | |
62dbec78 DM |
1059 | if (atomic_read(&mm->mm_users) == 1) { |
1060 | mm->cpu_vm_mask = cpumask_of_cpu(cpu); | |
1061 | goto local_flush_and_out; | |
1062 | } | |
1da177e4 | 1063 | |
62dbec78 DM |
1064 | smp_cross_call_masked(&xcall_flush_tlb_mm, |
1065 | ctx, 0, 0, | |
91a4231c | 1066 | &mm->cpu_vm_mask); |
1da177e4 | 1067 | |
62dbec78 DM |
1068 | local_flush_and_out: |
1069 | __flush_tlb_mm(ctx, SECONDARY_CONTEXT); | |
1da177e4 | 1070 | |
62dbec78 | 1071 | put_cpu(); |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs) | |
1075 | { | |
1076 | u32 ctx = CTX_HWBITS(mm->context); | |
1077 | int cpu = get_cpu(); | |
1078 | ||
dedeb002 | 1079 | if (mm == current->active_mm && atomic_read(&mm->mm_users) == 1) |
1da177e4 | 1080 | mm->cpu_vm_mask = cpumask_of_cpu(cpu); |
dedeb002 HD |
1081 | else |
1082 | smp_cross_call_masked(&xcall_flush_tlb_pending, | |
1083 | ctx, nr, (unsigned long) vaddrs, | |
91a4231c | 1084 | &mm->cpu_vm_mask); |
1da177e4 | 1085 | |
1da177e4 LT |
1086 | __flush_tlb_pending(ctx, nr, vaddrs); |
1087 | ||
1088 | put_cpu(); | |
1089 | } | |
1090 | ||
1091 | void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
1092 | { | |
1093 | start &= PAGE_MASK; | |
1094 | end = PAGE_ALIGN(end); | |
1095 | if (start != end) { | |
1096 | smp_cross_call(&xcall_flush_tlb_kernel_range, | |
1097 | 0, start, end); | |
1098 | ||
1099 | __flush_tlb_kernel_range(start, end); | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* CPU capture. */ | |
1104 | /* #define CAPTURE_DEBUG */ | |
1105 | extern unsigned long xcall_capture; | |
1106 | ||
1107 | static atomic_t smp_capture_depth = ATOMIC_INIT(0); | |
1108 | static atomic_t smp_capture_registry = ATOMIC_INIT(0); | |
1109 | static unsigned long penguins_are_doing_time; | |
1110 | ||
1111 | void smp_capture(void) | |
1112 | { | |
1113 | int result = atomic_add_ret(1, &smp_capture_depth); | |
1114 | ||
1115 | if (result == 1) { | |
1116 | int ncpus = num_online_cpus(); | |
1117 | ||
1118 | #ifdef CAPTURE_DEBUG | |
1119 | printk("CPU[%d]: Sending penguins to jail...", | |
1120 | smp_processor_id()); | |
1121 | #endif | |
1122 | penguins_are_doing_time = 1; | |
4f07118f | 1123 | membar_storestore_loadstore(); |
1da177e4 LT |
1124 | atomic_inc(&smp_capture_registry); |
1125 | smp_cross_call(&xcall_capture, 0, 0, 0); | |
1126 | while (atomic_read(&smp_capture_registry) != ncpus) | |
4f07118f | 1127 | rmb(); |
1da177e4 LT |
1128 | #ifdef CAPTURE_DEBUG |
1129 | printk("done\n"); | |
1130 | #endif | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | void smp_release(void) | |
1135 | { | |
1136 | if (atomic_dec_and_test(&smp_capture_depth)) { | |
1137 | #ifdef CAPTURE_DEBUG | |
1138 | printk("CPU[%d]: Giving pardon to " | |
1139 | "imprisoned penguins\n", | |
1140 | smp_processor_id()); | |
1141 | #endif | |
1142 | penguins_are_doing_time = 0; | |
4f07118f | 1143 | membar_storeload_storestore(); |
1da177e4 LT |
1144 | atomic_dec(&smp_capture_registry); |
1145 | } | |
1146 | } | |
1147 | ||
1148 | /* Imprisoned penguins run with %pil == 15, but PSTATE_IE set, so they | |
1149 | * can service tlb flush xcalls... | |
1150 | */ | |
1151 | extern void prom_world(int); | |
96c6e0d8 | 1152 | |
1da177e4 LT |
1153 | void smp_penguin_jailcell(int irq, struct pt_regs *regs) |
1154 | { | |
1da177e4 LT |
1155 | clear_softint(1 << irq); |
1156 | ||
1157 | preempt_disable(); | |
1158 | ||
1159 | __asm__ __volatile__("flushw"); | |
1da177e4 LT |
1160 | prom_world(1); |
1161 | atomic_inc(&smp_capture_registry); | |
4f07118f | 1162 | membar_storeload_storestore(); |
1da177e4 | 1163 | while (penguins_are_doing_time) |
4f07118f | 1164 | rmb(); |
1da177e4 LT |
1165 | atomic_dec(&smp_capture_registry); |
1166 | prom_world(0); | |
1167 | ||
1168 | preempt_enable(); | |
1169 | } | |
1170 | ||
1da177e4 | 1171 | /* /proc/profile writes can call this, don't __init it please. */ |
1da177e4 LT |
1172 | int setup_profiling_timer(unsigned int multiplier) |
1173 | { | |
777a4475 | 1174 | return -EINVAL; |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
1178 | { | |
1da177e4 LT |
1179 | } |
1180 | ||
5cbc3073 | 1181 | void __devinit smp_prepare_boot_cpu(void) |
7abea921 | 1182 | { |
7abea921 DM |
1183 | } |
1184 | ||
5e0797e5 DM |
1185 | void __init smp_setup_processor_id(void) |
1186 | { | |
1187 | if (tlb_type == spitfire) | |
deb16999 | 1188 | xcall_deliver_impl = spitfire_xcall_deliver; |
5e0797e5 | 1189 | else if (tlb_type == cheetah || tlb_type == cheetah_plus) |
deb16999 | 1190 | xcall_deliver_impl = cheetah_xcall_deliver; |
5e0797e5 | 1191 | else |
deb16999 | 1192 | xcall_deliver_impl = hypervisor_xcall_deliver; |
5e0797e5 DM |
1193 | } |
1194 | ||
5cbc3073 | 1195 | void __devinit smp_fill_in_sib_core_maps(void) |
1da177e4 | 1196 | { |
5cbc3073 DM |
1197 | unsigned int i; |
1198 | ||
e0204409 | 1199 | for_each_present_cpu(i) { |
5cbc3073 DM |
1200 | unsigned int j; |
1201 | ||
39dd992a | 1202 | cpus_clear(cpu_core_map[i]); |
5cbc3073 | 1203 | if (cpu_data(i).core_id == 0) { |
f78eae2e | 1204 | cpu_set(i, cpu_core_map[i]); |
5cbc3073 DM |
1205 | continue; |
1206 | } | |
1207 | ||
e0204409 | 1208 | for_each_present_cpu(j) { |
5cbc3073 DM |
1209 | if (cpu_data(i).core_id == |
1210 | cpu_data(j).core_id) | |
f78eae2e DM |
1211 | cpu_set(j, cpu_core_map[i]); |
1212 | } | |
1213 | } | |
1214 | ||
e0204409 | 1215 | for_each_present_cpu(i) { |
f78eae2e DM |
1216 | unsigned int j; |
1217 | ||
d5a7430d | 1218 | cpus_clear(per_cpu(cpu_sibling_map, i)); |
f78eae2e | 1219 | if (cpu_data(i).proc_id == -1) { |
d5a7430d | 1220 | cpu_set(i, per_cpu(cpu_sibling_map, i)); |
f78eae2e DM |
1221 | continue; |
1222 | } | |
1223 | ||
e0204409 | 1224 | for_each_present_cpu(j) { |
f78eae2e DM |
1225 | if (cpu_data(i).proc_id == |
1226 | cpu_data(j).proc_id) | |
d5a7430d | 1227 | cpu_set(j, per_cpu(cpu_sibling_map, i)); |
5cbc3073 DM |
1228 | } |
1229 | } | |
1da177e4 LT |
1230 | } |
1231 | ||
b282b6f8 | 1232 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
1233 | { |
1234 | int ret = smp_boot_one_cpu(cpu); | |
1235 | ||
1236 | if (!ret) { | |
1237 | cpu_set(cpu, smp_commenced_mask); | |
1238 | while (!cpu_isset(cpu, cpu_online_map)) | |
1239 | mb(); | |
1240 | if (!cpu_isset(cpu, cpu_online_map)) { | |
1241 | ret = -ENODEV; | |
1242 | } else { | |
02fead75 DM |
1243 | /* On SUN4V, writes to %tick and %stick are |
1244 | * not allowed. | |
1245 | */ | |
1246 | if (tlb_type != hypervisor) | |
1247 | smp_synchronize_one_tick(cpu); | |
1da177e4 LT |
1248 | } |
1249 | } | |
1250 | return ret; | |
1251 | } | |
1252 | ||
4f0234f4 | 1253 | #ifdef CONFIG_HOTPLUG_CPU |
e0204409 DM |
1254 | void cpu_play_dead(void) |
1255 | { | |
1256 | int cpu = smp_processor_id(); | |
1257 | unsigned long pstate; | |
1258 | ||
1259 | idle_task_exit(); | |
1260 | ||
1261 | if (tlb_type == hypervisor) { | |
1262 | struct trap_per_cpu *tb = &trap_block[cpu]; | |
1263 | ||
1264 | sun4v_cpu_qconf(HV_CPU_QUEUE_CPU_MONDO, | |
1265 | tb->cpu_mondo_pa, 0); | |
1266 | sun4v_cpu_qconf(HV_CPU_QUEUE_DEVICE_MONDO, | |
1267 | tb->dev_mondo_pa, 0); | |
1268 | sun4v_cpu_qconf(HV_CPU_QUEUE_RES_ERROR, | |
1269 | tb->resum_mondo_pa, 0); | |
1270 | sun4v_cpu_qconf(HV_CPU_QUEUE_NONRES_ERROR, | |
1271 | tb->nonresum_mondo_pa, 0); | |
1272 | } | |
1273 | ||
1274 | cpu_clear(cpu, smp_commenced_mask); | |
1275 | membar_safe("#Sync"); | |
1276 | ||
1277 | local_irq_disable(); | |
1278 | ||
1279 | __asm__ __volatile__( | |
1280 | "rdpr %%pstate, %0\n\t" | |
1281 | "wrpr %0, %1, %%pstate" | |
1282 | : "=r" (pstate) | |
1283 | : "i" (PSTATE_IE)); | |
1284 | ||
1285 | while (1) | |
1286 | barrier(); | |
1287 | } | |
1288 | ||
4f0234f4 DM |
1289 | int __cpu_disable(void) |
1290 | { | |
e0204409 DM |
1291 | int cpu = smp_processor_id(); |
1292 | cpuinfo_sparc *c; | |
1293 | int i; | |
1294 | ||
1295 | for_each_cpu_mask(i, cpu_core_map[cpu]) | |
1296 | cpu_clear(cpu, cpu_core_map[i]); | |
1297 | cpus_clear(cpu_core_map[cpu]); | |
1298 | ||
d5a7430d MT |
1299 | for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) |
1300 | cpu_clear(cpu, per_cpu(cpu_sibling_map, i)); | |
1301 | cpus_clear(per_cpu(cpu_sibling_map, cpu)); | |
e0204409 DM |
1302 | |
1303 | c = &cpu_data(cpu); | |
1304 | ||
1305 | c->core_id = 0; | |
1306 | c->proc_id = -1; | |
1307 | ||
1308 | spin_lock(&call_lock); | |
1309 | cpu_clear(cpu, cpu_online_map); | |
1310 | spin_unlock(&call_lock); | |
1311 | ||
1312 | smp_wmb(); | |
1313 | ||
1314 | /* Make sure no interrupts point to this cpu. */ | |
1315 | fixup_irqs(); | |
1316 | ||
1317 | local_irq_enable(); | |
1318 | mdelay(1); | |
1319 | local_irq_disable(); | |
1320 | ||
1321 | return 0; | |
4f0234f4 DM |
1322 | } |
1323 | ||
1324 | void __cpu_die(unsigned int cpu) | |
1325 | { | |
e0204409 DM |
1326 | int i; |
1327 | ||
1328 | for (i = 0; i < 100; i++) { | |
1329 | smp_rmb(); | |
1330 | if (!cpu_isset(cpu, smp_commenced_mask)) | |
1331 | break; | |
1332 | msleep(100); | |
1333 | } | |
1334 | if (cpu_isset(cpu, smp_commenced_mask)) { | |
1335 | printk(KERN_ERR "CPU %u didn't die...\n", cpu); | |
1336 | } else { | |
1337 | #if defined(CONFIG_SUN_LDOMS) | |
1338 | unsigned long hv_err; | |
1339 | int limit = 100; | |
1340 | ||
1341 | do { | |
1342 | hv_err = sun4v_cpu_stop(cpu); | |
1343 | if (hv_err == HV_EOK) { | |
1344 | cpu_clear(cpu, cpu_present_map); | |
1345 | break; | |
1346 | } | |
1347 | } while (--limit > 0); | |
1348 | if (limit <= 0) { | |
1349 | printk(KERN_ERR "sun4v_cpu_stop() fails err=%lu\n", | |
1350 | hv_err); | |
1351 | } | |
1352 | #endif | |
1353 | } | |
4f0234f4 DM |
1354 | } |
1355 | #endif | |
1356 | ||
1da177e4 LT |
1357 | void __init smp_cpus_done(unsigned int max_cpus) |
1358 | { | |
1da177e4 LT |
1359 | } |
1360 | ||
1da177e4 LT |
1361 | void smp_send_reschedule(int cpu) |
1362 | { | |
19926630 DM |
1363 | xcall_deliver((u64) &xcall_receive_signal, 0, 0, |
1364 | &cpumask_of_cpu(cpu)); | |
1365 | } | |
1366 | ||
1367 | void smp_receive_signal_client(int irq, struct pt_regs *regs) | |
1368 | { | |
1369 | clear_softint(1 << irq); | |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | /* This is a nop because we capture all other cpus | |
1373 | * anyways when making the PROM active. | |
1374 | */ | |
1375 | void smp_send_stop(void) | |
1376 | { | |
1377 | } | |
1378 | ||
d369ddd2 DM |
1379 | unsigned long __per_cpu_base __read_mostly; |
1380 | unsigned long __per_cpu_shift __read_mostly; | |
1da177e4 LT |
1381 | |
1382 | EXPORT_SYMBOL(__per_cpu_base); | |
1383 | EXPORT_SYMBOL(__per_cpu_shift); | |
1384 | ||
5cbc3073 | 1385 | void __init real_setup_per_cpu_areas(void) |
1da177e4 | 1386 | { |
b9709456 | 1387 | unsigned long paddr, goal, size, i; |
1da177e4 | 1388 | char *ptr; |
1da177e4 LT |
1389 | |
1390 | /* Copy section for each CPU (we discard the original) */ | |
5a089006 DM |
1391 | goal = PERCPU_ENOUGH_ROOM; |
1392 | ||
b6e3590f JF |
1393 | __per_cpu_shift = PAGE_SHIFT; |
1394 | for (size = PAGE_SIZE; size < goal; size <<= 1UL) | |
1da177e4 LT |
1395 | __per_cpu_shift++; |
1396 | ||
b9709456 DM |
1397 | paddr = lmb_alloc(size * NR_CPUS, PAGE_SIZE); |
1398 | if (!paddr) { | |
1399 | prom_printf("Cannot allocate per-cpu memory.\n"); | |
1400 | prom_halt(); | |
1401 | } | |
1da177e4 | 1402 | |
b9709456 | 1403 | ptr = __va(paddr); |
1da177e4 LT |
1404 | __per_cpu_base = ptr - __per_cpu_start; |
1405 | ||
1da177e4 LT |
1406 | for (i = 0; i < NR_CPUS; i++, ptr += size) |
1407 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
951bc82c DM |
1408 | |
1409 | /* Setup %g5 for the boot cpu. */ | |
1410 | __local_per_cpu_offset = __per_cpu_offset(smp_processor_id()); | |
1da177e4 | 1411 | } |