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Linux/arch/sparc/kernel/leon_smp.c

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  1 // SPDX-License-Identifier: GPL-2.0
  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>
 13 #include <linux/sched/mm.h>
 14 #include <linux/threads.h>
 15 #include <linux/smp.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/kernel_stat.h>
 18 #include <linux/of.h>
 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>
 26 #include <linux/gfp.h>
 27 #include <linux/cpu.h>
 28 #include <linux/clockchips.h>
 29 
 30 #include <asm/cacheflush.h>
 31 #include <asm/tlbflush.h>
 32 
 33 #include <asm/ptrace.h>
 34 #include <linux/atomic.h>
 35 #include <asm/irq_regs.h>
 36 #include <asm/traps.h>
 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>
 48 #include <asm/timer.h>
 49 
 50 #include "kernel.h"
 51 
 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];
 57 extern cpumask_t smp_commenced_mask;
 58 void leon_configure_cache_smp(void);
 59 static void leon_ipi_init(void);
 60 
 61 /* IRQ number of LEON IPIs */
 62 int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
 63 
 64 static inline unsigned long do_swap(volatile unsigned long *ptr,
 65                                     unsigned long val)
 66 {
 67         __asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
 68                              : ""(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
 69                              : "memory");
 70         return val;
 71 }
 72 
 73 void leon_cpu_pre_starting(void *arg)
 74 {
 75         leon_configure_cache_smp();
 76 }
 77 
 78 void leon_cpu_pre_online(void *arg)
 79 {
 80         int cpuid = hard_smp_processor_id();
 81 
 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).
 86          */
 87         do_swap(&cpu_callin_map[cpuid], 1);
 88 
 89         local_ops->cache_all();
 90         local_ops->tlb_all();
 91 
 92         /* Fix idle thread fields. */
 93         __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
 94                              : "memory" /* paranoid */);
 95 
 96         /* Attach to the address space of init_task. */
 97         mmgrab(&init_mm);
 98         current->active_mm = &init_mm;
 99 
100         while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
101                 mb();
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 
110 void leon_configure_cache_smp(void)
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 
130         local_ops->cache_all();
131         local_ops->tlb_all();
132 }
133 
134 static void leon_smp_setbroadcast(unsigned int mask)
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 
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 
165         /* Setup IPI */
166         leon_ipi_init();
167 
168         printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
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);
174         leon_enable_irq_cpu(leon_ipi_irq, me);
175 
176         leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
177 
178         leon_configure_cache_smp();
179         local_ops->cache_all();
180 
181 }
182 
183 int leon_boot_one_cpu(int i, struct task_struct *idle)
184 {
185         int timeout;
186 
187         current_set[i] = task_thread_info(idle);
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);
201         local_ops->cache_all();
202 
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 */
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         }
215         printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
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);
223                 leon_enable_irq_cpu(leon_ipi_irq, i);
224         }
225 
226         local_ops->cache_all();
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;
246         local_ops->cache_all();
247 
248         /* Free unneeded trap tables */
249         if (!cpu_present(1)) {
250                 free_reserved_page(virt_to_page(&trapbase_cpu1));
251         }
252         if (!cpu_present(2)) {
253                 free_reserved_page(virt_to_page(&trapbase_cpu2));
254         }
255         if (!cpu_present(3)) {
256                 free_reserved_page(virt_to_page(&trapbase_cpu3));
257         }
258         /* Ok, they are spinning and ready to go. */
259         smp_processors_ready = 1;
260 
261 }
262 
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;
296         local_ops->cache_all();
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 
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 
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 */
320         leon_send_ipi(cpu, leon_ipi_irq);
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 */
331         leon_send_ipi(cpu, leon_ipi_irq);
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) */
342         leon_send_ipi(cpu, leon_ipi_irq);
343 }
344 
345 void leonsmp_ipi_interrupt(void)
346 {
347         struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work);
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 
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. */
372 } ccall_info __attribute__((aligned(8)));
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 
408                         cpumask_clear_cpu(smp_processor_id(), &mask);
409                         cpumask_and(&mask, cpu_online_mask, &mask);
410                         for (i = 0; i <= high; i++) {
411                                 if (cpumask_test_cpu(i, &mask)) {
412                                         ccall_info.processors_in[i] = 0;
413                                         ccall_info.processors_out[i] = 0;
414                                         leon_send_ipi(i, LEON3_IRQ_CROSS_CALL);
415 
416                                 }
417                         }
418                 }
419 
420                 {
421                         register int i;
422 
423                         i = 0;
424                         do {
425                                 if (!cpumask_test_cpu(i, &mask))
426                                         continue;
427 
428                                 while (!ccall_info.processors_in[i])
429                                         barrier();
430                         } while (++i <= high);
431 
432                         i = 0;
433                         do {
434                                 if (!cpumask_test_cpu(i, &mask))
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 
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 
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 
469         sparc32_ipi_ops = &leon_ipi_ops;
470 }
471 

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