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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8401707f KE |
2 | /* leon_smp.c: Sparc-Leon SMP support. |
3 | * | |
4 | * based on sun4m_smp.c | |
5 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB | |
7 | * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB | |
8 | */ | |
9 | ||
10 | #include <asm/head.h> | |
11 | ||
12 | #include <linux/kernel.h> | |
68e21be2 | 13 | #include <linux/sched/mm.h> |
8401707f KE |
14 | #include <linux/threads.h> |
15 | #include <linux/smp.h> | |
8401707f KE |
16 | #include <linux/interrupt.h> |
17 | #include <linux/kernel_stat.h> | |
1ca0c808 | 18 | #include <linux/of.h> |
8401707f KE |
19 | #include <linux/init.h> |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/profile.h> | |
24 | #include <linux/pm.h> | |
25 | #include <linux/delay.h> | |
5a0e3ad6 | 26 | #include <linux/gfp.h> |
62f08283 TK |
27 | #include <linux/cpu.h> |
28 | #include <linux/clockchips.h> | |
8401707f KE |
29 | |
30 | #include <asm/cacheflush.h> | |
31 | #include <asm/tlbflush.h> | |
32 | ||
33 | #include <asm/ptrace.h> | |
60063497 | 34 | #include <linux/atomic.h> |
8401707f | 35 | #include <asm/irq_regs.h> |
1ca0c808 | 36 | #include <asm/traps.h> |
8401707f KE |
37 | |
38 | #include <asm/delay.h> | |
39 | #include <asm/irq.h> | |
40 | #include <asm/page.h> | |
41 | #include <asm/pgalloc.h> | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/oplib.h> | |
44 | #include <asm/cpudata.h> | |
45 | #include <asm/asi.h> | |
46 | #include <asm/leon.h> | |
47 | #include <asm/leon_amba.h> | |
62f08283 | 48 | #include <asm/timer.h> |
8401707f | 49 | |
a2a211cb SR |
50 | #include "kernel.h" |
51 | ||
8401707f KE |
52 | #include "irq.h" |
53 | ||
54 | extern ctxd_t *srmmu_ctx_table_phys; | |
55 | static int smp_processors_ready; | |
56 | extern volatile unsigned long cpu_callin_map[NR_CPUS]; | |
8401707f | 57 | extern cpumask_t smp_commenced_mask; |
2066aadd | 58 | void leon_configure_cache_smp(void); |
1ca0c808 DH |
59 | static void leon_ipi_init(void); |
60 | ||
61 | /* IRQ number of LEON IPIs */ | |
62 | int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT; | |
8401707f KE |
63 | |
64 | static inline unsigned long do_swap(volatile unsigned long *ptr, | |
65 | unsigned long val) | |
66 | { | |
502279a7 DH |
67 | __asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val) |
68 | : "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS) | |
8401707f KE |
69 | : "memory"); |
70 | return val; | |
71 | } | |
72 | ||
2066aadd | 73 | void leon_cpu_pre_starting(void *arg) |
8401707f | 74 | { |
8401707f | 75 | leon_configure_cache_smp(); |
f9fd3488 | 76 | } |
8401707f | 77 | |
2066aadd | 78 | void leon_cpu_pre_online(void *arg) |
f9fd3488 SR |
79 | { |
80 | int cpuid = hard_smp_processor_id(); | |
8401707f | 81 | |
f9fd3488 SR |
82 | /* Allow master to continue. The master will then give us the |
83 | * go-ahead by setting the smp_commenced_mask and will wait without | |
84 | * timeouts until our setup is completed fully (signified by | |
85 | * our bit being set in the cpu_online_mask). | |
8401707f KE |
86 | */ |
87 | do_swap(&cpu_callin_map[cpuid], 1); | |
88 | ||
5d83d666 DM |
89 | local_ops->cache_all(); |
90 | local_ops->tlb_all(); | |
8401707f | 91 | |
8401707f KE |
92 | /* Fix idle thread fields. */ |
93 | __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid]) | |
94 | : "memory" /* paranoid */); | |
95 | ||
96 | /* Attach to the address space of init_task. */ | |
f1f10076 | 97 | mmgrab(&init_mm); |
8401707f KE |
98 | current->active_mm = &init_mm; |
99 | ||
fb1fece5 | 100 | while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) |
8401707f | 101 | mb(); |
8401707f KE |
102 | } |
103 | ||
104 | /* | |
105 | * Cycle through the processors asking the PROM to start each one. | |
106 | */ | |
107 | ||
108 | extern struct linux_prom_registers smp_penguin_ctable; | |
109 | ||
2066aadd | 110 | void leon_configure_cache_smp(void) |
8401707f KE |
111 | { |
112 | unsigned long cfg = sparc_leon3_get_dcachecfg(); | |
113 | int me = smp_processor_id(); | |
114 | ||
115 | if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) { | |
116 | printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n", | |
117 | (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg), | |
118 | (unsigned int)cfg, (unsigned int)me); | |
119 | sparc_leon3_disable_cache(); | |
120 | } else { | |
121 | if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) { | |
122 | sparc_leon3_enable_snooping(); | |
123 | } else { | |
124 | printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n", | |
125 | me); | |
126 | sparc_leon3_disable_cache(); | |
127 | } | |
128 | } | |
129 | ||
5d83d666 DM |
130 | local_ops->cache_all(); |
131 | local_ops->tlb_all(); | |
8401707f KE |
132 | } |
133 | ||
1bbc9060 | 134 | static void leon_smp_setbroadcast(unsigned int mask) |
8401707f KE |
135 | { |
136 | int broadcast = | |
137 | ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> | |
138 | LEON3_IRQMPSTATUS_BROADCAST) & 1); | |
139 | if (!broadcast) { | |
140 | prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n", | |
141 | leon_smp_nrcpus()); | |
142 | if (leon_smp_nrcpus() > 1) { | |
143 | BUG(); | |
144 | } else { | |
145 | prom_printf("continue anyway\n"); | |
146 | return; | |
147 | } | |
148 | } | |
149 | LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask); | |
150 | } | |
151 | ||
8401707f KE |
152 | int leon_smp_nrcpus(void) |
153 | { | |
154 | int nrcpu = | |
155 | ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> | |
156 | LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1; | |
157 | return nrcpu; | |
158 | } | |
159 | ||
160 | void __init leon_boot_cpus(void) | |
161 | { | |
162 | int nrcpu = leon_smp_nrcpus(); | |
163 | int me = smp_processor_id(); | |
164 | ||
1ca0c808 DH |
165 | /* Setup IPI */ |
166 | leon_ipi_init(); | |
167 | ||
0da2b300 | 168 | printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me, |
8401707f KE |
169 | (unsigned int)nrcpu, (unsigned int)NR_CPUS, |
170 | (unsigned int)&(leon3_irqctrl_regs->mpstatus)); | |
171 | ||
172 | leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me); | |
173 | leon_enable_irq_cpu(LEON3_IRQ_TICKER, me); | |
1ca0c808 | 174 | leon_enable_irq_cpu(leon_ipi_irq, me); |
8401707f KE |
175 | |
176 | leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER); | |
177 | ||
178 | leon_configure_cache_smp(); | |
5d83d666 | 179 | local_ops->cache_all(); |
8401707f KE |
180 | |
181 | } | |
182 | ||
2066aadd | 183 | int leon_boot_one_cpu(int i, struct task_struct *idle) |
8401707f | 184 | { |
8401707f KE |
185 | int timeout; |
186 | ||
f0a2bc7e | 187 | current_set[i] = task_thread_info(idle); |
8401707f KE |
188 | |
189 | /* See trampoline.S:leon_smp_cpu_startup for details... | |
190 | * Initialize the contexts table | |
191 | * Since the call to prom_startcpu() trashes the structure, | |
192 | * we need to re-initialize it for each cpu | |
193 | */ | |
194 | smp_penguin_ctable.which_io = 0; | |
195 | smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys; | |
196 | smp_penguin_ctable.reg_size = 0; | |
197 | ||
198 | /* whirrr, whirrr, whirrrrrrrrr... */ | |
199 | printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i, | |
200 | (unsigned int)&leon3_irqctrl_regs->mpstatus); | |
5d83d666 | 201 | local_ops->cache_all(); |
8401707f | 202 | |
970def65 DH |
203 | /* Make sure all IRQs are of from the start for this new CPU */ |
204 | LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0); | |
205 | ||
206 | /* Wake one CPU */ | |
8401707f KE |
207 | LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i); |
208 | ||
209 | /* wheee... it's going... */ | |
210 | for (timeout = 0; timeout < 10000; timeout++) { | |
211 | if (cpu_callin_map[i]) | |
212 | break; | |
213 | udelay(200); | |
214 | } | |
0da2b300 | 215 | printk(KERN_INFO "Started CPU %d\n", (unsigned int)i); |
8401707f KE |
216 | |
217 | if (!(cpu_callin_map[i])) { | |
218 | printk(KERN_ERR "Processor %d is stuck.\n", i); | |
219 | return -ENODEV; | |
220 | } else { | |
221 | leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i); | |
222 | leon_enable_irq_cpu(LEON3_IRQ_TICKER, i); | |
1ca0c808 | 223 | leon_enable_irq_cpu(leon_ipi_irq, i); |
8401707f KE |
224 | } |
225 | ||
5d83d666 | 226 | local_ops->cache_all(); |
8401707f KE |
227 | return 0; |
228 | } | |
229 | ||
230 | void __init leon_smp_done(void) | |
231 | { | |
232 | ||
233 | int i, first; | |
234 | int *prev; | |
235 | ||
236 | /* setup cpu list for irq rotation */ | |
237 | first = 0; | |
238 | prev = &first; | |
239 | for (i = 0; i < NR_CPUS; i++) { | |
240 | if (cpu_online(i)) { | |
241 | *prev = i; | |
242 | prev = &cpu_data(i).next; | |
243 | } | |
244 | } | |
245 | *prev = first; | |
5d83d666 | 246 | local_ops->cache_all(); |
8401707f KE |
247 | |
248 | /* Free unneeded trap tables */ | |
fb1fece5 | 249 | if (!cpu_present(1)) { |
70affe45 | 250 | free_reserved_page(virt_to_page(&trapbase_cpu1)); |
8401707f | 251 | } |
fb1fece5 | 252 | if (!cpu_present(2)) { |
70affe45 | 253 | free_reserved_page(virt_to_page(&trapbase_cpu2)); |
8401707f | 254 | } |
fb1fece5 | 255 | if (!cpu_present(3)) { |
70affe45 | 256 | free_reserved_page(virt_to_page(&trapbase_cpu3)); |
8401707f KE |
257 | } |
258 | /* Ok, they are spinning and ready to go. */ | |
259 | smp_processors_ready = 1; | |
260 | ||
261 | } | |
262 | ||
1ca0c808 DH |
263 | struct leon_ipi_work { |
264 | int single; | |
265 | int msk; | |
266 | int resched; | |
267 | }; | |
268 | ||
269 | static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work); | |
270 | ||
271 | /* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ | |
272 | * is used for all three types of IPIs. | |
273 | */ | |
274 | static void __init leon_ipi_init(void) | |
275 | { | |
276 | int cpu, len; | |
277 | struct leon_ipi_work *work; | |
278 | struct property *pp; | |
279 | struct device_node *rootnp; | |
280 | struct tt_entry *trap_table; | |
281 | unsigned long flags; | |
282 | ||
283 | /* Find IPI IRQ or stick with default value */ | |
284 | rootnp = of_find_node_by_path("/ambapp0"); | |
285 | if (rootnp) { | |
286 | pp = of_find_property(rootnp, "ipi_num", &len); | |
287 | if (pp && (*(int *)pp->value)) | |
288 | leon_ipi_irq = *(int *)pp->value; | |
289 | } | |
290 | printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq); | |
291 | ||
292 | /* Adjust so that we jump directly to smpleon_ipi */ | |
293 | local_irq_save(flags); | |
294 | trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)]; | |
295 | trap_table->inst_three += smpleon_ipi - real_irq_entry; | |
5d83d666 | 296 | local_ops->cache_all(); |
1ca0c808 DH |
297 | local_irq_restore(flags); |
298 | ||
299 | for_each_possible_cpu(cpu) { | |
300 | work = &per_cpu(leon_ipi_work, cpu); | |
301 | work->single = work->msk = work->resched = 0; | |
302 | } | |
303 | } | |
304 | ||
4ba22b16 SR |
305 | static void leon_send_ipi(int cpu, int level) |
306 | { | |
307 | unsigned long mask; | |
308 | mask = leon_get_irqmask(level); | |
309 | LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask); | |
310 | } | |
311 | ||
1ca0c808 DH |
312 | static void leon_ipi_single(int cpu) |
313 | { | |
314 | struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); | |
315 | ||
316 | /* Mark work */ | |
317 | work->single = 1; | |
318 | ||
319 | /* Generate IRQ on the CPU */ | |
4ba22b16 | 320 | leon_send_ipi(cpu, leon_ipi_irq); |
1ca0c808 DH |
321 | } |
322 | ||
323 | static void leon_ipi_mask_one(int cpu) | |
324 | { | |
325 | struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); | |
326 | ||
327 | /* Mark work */ | |
328 | work->msk = 1; | |
329 | ||
330 | /* Generate IRQ on the CPU */ | |
4ba22b16 | 331 | leon_send_ipi(cpu, leon_ipi_irq); |
1ca0c808 DH |
332 | } |
333 | ||
334 | static void leon_ipi_resched(int cpu) | |
335 | { | |
336 | struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); | |
337 | ||
338 | /* Mark work */ | |
339 | work->resched = 1; | |
340 | ||
341 | /* Generate IRQ on the CPU (any IRQ will cause resched) */ | |
4ba22b16 | 342 | leon_send_ipi(cpu, leon_ipi_irq); |
1ca0c808 DH |
343 | } |
344 | ||
345 | void leonsmp_ipi_interrupt(void) | |
346 | { | |
494fc421 | 347 | struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work); |
1ca0c808 DH |
348 | |
349 | if (work->single) { | |
350 | work->single = 0; | |
351 | smp_call_function_single_interrupt(); | |
352 | } | |
353 | if (work->msk) { | |
354 | work->msk = 0; | |
355 | smp_call_function_interrupt(); | |
356 | } | |
357 | if (work->resched) { | |
358 | work->resched = 0; | |
359 | smp_resched_interrupt(); | |
360 | } | |
361 | } | |
362 | ||
8401707f KE |
363 | static struct smp_funcall { |
364 | smpfunc_t func; | |
365 | unsigned long arg1; | |
366 | unsigned long arg2; | |
367 | unsigned long arg3; | |
368 | unsigned long arg4; | |
369 | unsigned long arg5; | |
370 | unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */ | |
371 | unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */ | |
92f268ee | 372 | } ccall_info __attribute__((aligned(8))); |
8401707f KE |
373 | |
374 | static DEFINE_SPINLOCK(cross_call_lock); | |
375 | ||
376 | /* Cross calls must be serialized, at least currently. */ | |
377 | static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, | |
378 | unsigned long arg2, unsigned long arg3, | |
379 | unsigned long arg4) | |
380 | { | |
381 | if (smp_processors_ready) { | |
382 | register int high = NR_CPUS - 1; | |
383 | unsigned long flags; | |
384 | ||
385 | spin_lock_irqsave(&cross_call_lock, flags); | |
386 | ||
387 | { | |
388 | /* If you make changes here, make sure gcc generates proper code... */ | |
389 | register smpfunc_t f asm("i0") = func; | |
390 | register unsigned long a1 asm("i1") = arg1; | |
391 | register unsigned long a2 asm("i2") = arg2; | |
392 | register unsigned long a3 asm("i3") = arg3; | |
393 | register unsigned long a4 asm("i4") = arg4; | |
394 | register unsigned long a5 asm("i5") = 0; | |
395 | ||
396 | __asm__ __volatile__("std %0, [%6]\n\t" | |
397 | "std %2, [%6 + 8]\n\t" | |
398 | "std %4, [%6 + 16]\n\t" : : | |
399 | "r"(f), "r"(a1), "r"(a2), "r"(a3), | |
400 | "r"(a4), "r"(a5), | |
401 | "r"(&ccall_info.func)); | |
402 | } | |
403 | ||
404 | /* Init receive/complete mapping, plus fire the IPI's off. */ | |
405 | { | |
406 | register int i; | |
407 | ||
fb1fece5 KM |
408 | cpumask_clear_cpu(smp_processor_id(), &mask); |
409 | cpumask_and(&mask, cpu_online_mask, &mask); | |
8401707f | 410 | for (i = 0; i <= high; i++) { |
fb1fece5 | 411 | if (cpumask_test_cpu(i, &mask)) { |
8401707f KE |
412 | ccall_info.processors_in[i] = 0; |
413 | ccall_info.processors_out[i] = 0; | |
4ba22b16 | 414 | leon_send_ipi(i, LEON3_IRQ_CROSS_CALL); |
8401707f KE |
415 | |
416 | } | |
417 | } | |
418 | } | |
419 | ||
420 | { | |
421 | register int i; | |
422 | ||
423 | i = 0; | |
424 | do { | |
fb1fece5 | 425 | if (!cpumask_test_cpu(i, &mask)) |
8401707f KE |
426 | continue; |
427 | ||
428 | while (!ccall_info.processors_in[i]) | |
429 | barrier(); | |
430 | } while (++i <= high); | |
431 | ||
432 | i = 0; | |
433 | do { | |
fb1fece5 | 434 | if (!cpumask_test_cpu(i, &mask)) |
8401707f KE |
435 | continue; |
436 | ||
437 | while (!ccall_info.processors_out[i]) | |
438 | barrier(); | |
439 | } while (++i <= high); | |
440 | } | |
441 | ||
442 | spin_unlock_irqrestore(&cross_call_lock, flags); | |
443 | } | |
444 | } | |
445 | ||
446 | /* Running cross calls. */ | |
447 | void leon_cross_call_irq(void) | |
448 | { | |
449 | int i = smp_processor_id(); | |
450 | ||
451 | ccall_info.processors_in[i] = 1; | |
452 | ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, | |
453 | ccall_info.arg4, ccall_info.arg5); | |
454 | ccall_info.processors_out[i] = 1; | |
455 | } | |
456 | ||
4ba22b16 SR |
457 | static const struct sparc32_ipi_ops leon_ipi_ops = { |
458 | .cross_call = leon_cross_call, | |
459 | .resched = leon_ipi_resched, | |
460 | .single = leon_ipi_single, | |
461 | .mask_one = leon_ipi_mask_one, | |
462 | }; | |
463 | ||
8401707f KE |
464 | void __init leon_init_smp(void) |
465 | { | |
466 | /* Patch ipi15 trap table */ | |
467 | t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m); | |
468 | ||
4ba22b16 | 469 | sparc32_ipi_ops = &leon_ipi_ops; |
8401707f | 470 | } |