1 /*
2 * linux/arch/m32r/kernel/smpboot.c
3 * orig : i386 2.4.10
4 *
5 * M32R SMP booting functions
6 *
7 * Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto
8 *
9 * Taken from i386 version.
10 * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
11 * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
12 *
13 * Much of the core SMP work is based on previous work by Thomas Radke, to
14 * whom a great many thanks are extended.
15 *
16 * Thanks to Intel for making available several different Pentium,
17 * Pentium Pro and Pentium-II/Xeon MP machines.
18 * Original development of Linux SMP code supported by Caldera.
19 *
20 * This code is released under the GNU General Public License version 2 or
21 * later.
22 *
23 * Fixes
24 * Felix Koop : NR_CPUS used properly
25 * Jose Renau : Handle single CPU case.
26 * Alan Cox : By repeated request
27 * 8) - Total BogoMIP report.
28 * Greg Wright : Fix for kernel stacks panic.
29 * Erich Boleyn : MP v1.4 and additional changes.
30 * Matthias Sattler : Changes for 2.1 kernel map.
31 * Michel Lespinasse : Changes for 2.1 kernel map.
32 * Michael Chastain : Change trampoline.S to gnu as.
33 * Alan Cox : Dumb bug: 'B' step PPro's are fine
34 * Ingo Molnar : Added APIC timers, based on code
35 * from Jose Renau
36 * Ingo Molnar : various cleanups and rewrites
37 * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug.
38 * Maciej W. Rozycki : Bits for genuine 82489DX APICs
39 * Martin J. Bligh : Added support for multi-quad systems
40 */
41
42 #include <linux/module.h>
43 #include <linux/cpu.h>
44 #include <linux/init.h>
45 #include <linux/kernel.h>
46 #include <linux/mm.h>
47 #include <linux/sched.h>
48 #include <linux/err.h>
49 #include <linux/irq.h>
50 #include <linux/bootmem.h>
51 #include <linux/delay.h>
52
53 #include <asm/io.h>
54 #include <asm/pgalloc.h>
55 #include <asm/tlbflush.h>
56
57 #define DEBUG_SMP
58 #ifdef DEBUG_SMP
59 #define Dprintk(x...) printk(x)
60 #else
61 #define Dprintk(x...)
62 #endif
63
64 extern cpumask_t cpu_initialized;
65
66 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
67 /* Data structures and variables */
68 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
69
70 /* Processor that is doing the boot up */
71 static unsigned int bsp_phys_id = -1;
72
73 /* Bitmask of physically existing CPUs */
74 physid_mask_t phys_cpu_present_map;
75
76 cpumask_t cpu_bootout_map;
77 cpumask_t cpu_bootin_map;
78 static cpumask_t cpu_callin_map;
79 cpumask_t cpu_callout_map;
80 EXPORT_SYMBOL(cpu_callout_map);
81
82 /* Per CPU bogomips and other parameters */
83 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
84
85 static int cpucount;
86 static cpumask_t smp_commenced_mask;
87
88 extern struct {
89 void * spi;
90 unsigned short ss;
91 } stack_start;
92
93 /* which physical physical ID maps to which logical CPU number */
94 static volatile int physid_2_cpu[NR_CPUS];
95 #define physid_to_cpu(physid) physid_2_cpu[physid]
96
97 /* which logical CPU number maps to which physical ID */
98 volatile int cpu_2_physid[NR_CPUS];
99
100 DEFINE_PER_CPU(int, prof_multiplier) = 1;
101 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
102 DEFINE_PER_CPU(int, prof_counter) = 1;
103
104 spinlock_t ipi_lock[NR_IPIS];
105
106 static unsigned int calibration_result;
107
108 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
109 /* Function Prototypes */
110 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
111
112 static void init_ipi_lock(void);
113 static void do_boot_cpu(int);
114
115 int start_secondary(void *);
116 static void smp_callin(void);
117 static void smp_online(void);
118
119 static void show_mp_info(int);
120 static void smp_store_cpu_info(int);
121 static void show_cpu_info(int);
122 int setup_profiling_timer(unsigned int);
123 static void init_cpu_to_physid(void);
124 static void map_cpu_to_physid(int, int);
125 static void unmap_cpu_to_physid(int, int);
126
127 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
128 /* Boot up APs Routines : BSP */
129 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
smp_prepare_boot_cpu(void)130 void smp_prepare_boot_cpu(void)
131 {
132 bsp_phys_id = hard_smp_processor_id();
133 physid_set(bsp_phys_id, phys_cpu_present_map);
134 set_cpu_online(0, true); /* BSP's cpu_id == 0 */
135 cpumask_set_cpu(0, &cpu_callout_map);
136 cpumask_set_cpu(0, &cpu_callin_map);
137
138 /*
139 * Initialize the logical to physical CPU number mapping
140 */
141 init_cpu_to_physid();
142 map_cpu_to_physid(0, bsp_phys_id);
143 current_thread_info()->cpu = 0;
144 }
145
146 /*==========================================================================*
147 * Name: smp_prepare_cpus (old smp_boot_cpus)
148 *
149 * Description: This routine boot up APs.
150 *
151 * Born on Date: 2002.02.05
152 *
153 * Arguments: NONE
154 *
155 * Returns: void (cannot fail)
156 *
157 * Modification log:
158 * Date Who Description
159 * ---------- --- --------------------------------------------------------
160 * 2003-06-24 hy modify for linux-2.5.69
161 *
162 *==========================================================================*/
smp_prepare_cpus(unsigned int max_cpus)163 void __init smp_prepare_cpus(unsigned int max_cpus)
164 {
165 int phys_id;
166 unsigned long nr_cpu;
167
168 nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
169 if (nr_cpu > NR_CPUS) {
170 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
171 nr_cpu, NR_CPUS);
172 goto smp_done;
173 }
174 for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
175 physid_set(phys_id, phys_cpu_present_map);
176 #ifndef CONFIG_HOTPLUG_CPU
177 init_cpu_present(cpu_possible_mask);
178 #endif
179
180 show_mp_info(nr_cpu);
181
182 init_ipi_lock();
183
184 /*
185 * Setup boot CPU information
186 */
187 smp_store_cpu_info(0); /* Final full version of the data */
188
189 /*
190 * If SMP should be disabled, then really disable it!
191 */
192 if (!max_cpus) {
193 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
194 goto smp_done;
195 }
196
197 /*
198 * Now scan the CPU present map and fire up the other CPUs.
199 */
200 Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
201
202 for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
203 /*
204 * Don't even attempt to start the boot CPU!
205 */
206 if (phys_id == bsp_phys_id)
207 continue;
208
209 if (!physid_isset(phys_id, phys_cpu_present_map))
210 continue;
211
212 if (max_cpus <= cpucount + 1)
213 continue;
214
215 do_boot_cpu(phys_id);
216
217 /*
218 * Make sure we unmap all failed CPUs
219 */
220 if (physid_to_cpu(phys_id) == -1) {
221 physid_clear(phys_id, phys_cpu_present_map);
222 printk("phys CPU#%d not responding - " \
223 "cannot use it.\n", phys_id);
224 }
225 }
226
227 smp_done:
228 Dprintk("Boot done.\n");
229 }
230
231 /*
232 * init_ipi_lock : Initialize IPI locks.
233 */
init_ipi_lock(void)234 static void __init init_ipi_lock(void)
235 {
236 int ipi;
237
238 for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
239 spin_lock_init(&ipi_lock[ipi]);
240 }
241
242 /*==========================================================================*
243 * Name: do_boot_cpu
244 *
245 * Description: This routine boot up one AP.
246 *
247 * Born on Date: 2002.02.05
248 *
249 * Arguments: phys_id - Target CPU physical ID
250 *
251 * Returns: void (cannot fail)
252 *
253 * Modification log:
254 * Date Who Description
255 * ---------- --- --------------------------------------------------------
256 * 2003-06-24 hy modify for linux-2.5.69
257 *
258 *==========================================================================*/
do_boot_cpu(int phys_id)259 static void __init do_boot_cpu(int phys_id)
260 {
261 struct task_struct *idle;
262 unsigned long send_status, boot_status;
263 int timeout, cpu_id;
264
265 cpu_id = ++cpucount;
266
267 /*
268 * We can't use kernel_thread since we must avoid to
269 * reschedule the child.
270 */
271 idle = fork_idle(cpu_id);
272 if (IS_ERR(idle))
273 panic("failed fork for CPU#%d.", cpu_id);
274
275 idle->thread.lr = (unsigned long)start_secondary;
276
277 map_cpu_to_physid(cpu_id, phys_id);
278
279 /* So we see what's up */
280 printk("Booting processor %d/%d\n", phys_id, cpu_id);
281 stack_start.spi = (void *)idle->thread.sp;
282 task_thread_info(idle)->cpu = cpu_id;
283
284 /*
285 * Send Startup IPI
286 * 1.IPI received by CPU#(phys_id).
287 * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
288 * 3.CPU#(phys_id) enter start_secondary()
289 */
290 send_status = 0;
291 boot_status = 0;
292
293 cpumask_set_cpu(phys_id, &cpu_bootout_map);
294
295 /* Send Startup IPI */
296 send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
297
298 Dprintk("Waiting for send to finish...\n");
299 timeout = 0;
300
301 /* Wait 100[ms] */
302 do {
303 Dprintk("+");
304 udelay(1000);
305 send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
306 } while (send_status && (timeout++ < 100));
307
308 Dprintk("After Startup.\n");
309
310 if (!send_status) {
311 /*
312 * allow APs to start initializing.
313 */
314 Dprintk("Before Callout %d.\n", cpu_id);
315 cpumask_set_cpu(cpu_id, &cpu_callout_map);
316 Dprintk("After Callout %d.\n", cpu_id);
317
318 /*
319 * Wait 5s total for a response
320 */
321 for (timeout = 0; timeout < 5000; timeout++) {
322 if (cpumask_test_cpu(cpu_id, &cpu_callin_map))
323 break; /* It has booted */
324 udelay(1000);
325 }
326
327 if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
328 /* number CPUs logically, starting from 1 (BSP is 0) */
329 Dprintk("OK.\n");
330 } else {
331 boot_status = 1;
332 printk("Not responding.\n");
333 }
334 } else
335 printk("IPI never delivered???\n");
336
337 if (send_status || boot_status) {
338 unmap_cpu_to_physid(cpu_id, phys_id);
339 cpumask_clear_cpu(cpu_id, &cpu_callout_map);
340 cpumask_clear_cpu(cpu_id, &cpu_callin_map);
341 cpumask_clear_cpu(cpu_id, &cpu_initialized);
342 cpucount--;
343 }
344 }
345
__cpu_up(unsigned int cpu_id,struct task_struct * tidle)346 int __cpuinit __cpu_up(unsigned int cpu_id, struct task_struct *tidle)
347 {
348 int timeout;
349
350 cpumask_set_cpu(cpu_id, &smp_commenced_mask);
351
352 /*
353 * Wait 5s total for a response
354 */
355 for (timeout = 0; timeout < 5000; timeout++) {
356 if (cpu_online(cpu_id))
357 break;
358 udelay(1000);
359 }
360 if (!cpu_online(cpu_id))
361 BUG();
362
363 return 0;
364 }
365
smp_cpus_done(unsigned int max_cpus)366 void __init smp_cpus_done(unsigned int max_cpus)
367 {
368 int cpu_id, timeout;
369 unsigned long bogosum = 0;
370
371 for (timeout = 0; timeout < 5000; timeout++) {
372 if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
373 break;
374 udelay(1000);
375 }
376 if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
377 BUG();
378
379 for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
380 show_cpu_info(cpu_id);
381
382 /*
383 * Allow the user to impress friends.
384 */
385 Dprintk("Before bogomips.\n");
386 if (cpucount) {
387 for_each_cpu(cpu_id,cpu_online_mask)
388 bogosum += cpu_data[cpu_id].loops_per_jiffy;
389
390 printk(KERN_INFO "Total of %d processors activated " \
391 "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
392 bogosum / (500000 / HZ),
393 (bogosum / (5000 / HZ)) % 100);
394 Dprintk("Before bogocount - setting activated=1.\n");
395 }
396 }
397
398 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
399 /* Activate a secondary processor Routines */
400 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
401
402 /*==========================================================================*
403 * Name: start_secondary
404 *
405 * Description: This routine activate a secondary processor.
406 *
407 * Born on Date: 2002.02.05
408 *
409 * Arguments: *unused - currently unused.
410 *
411 * Returns: void (cannot fail)
412 *
413 * Modification log:
414 * Date Who Description
415 * ---------- --- --------------------------------------------------------
416 * 2003-06-24 hy modify for linux-2.5.69
417 *
418 *==========================================================================*/
start_secondary(void * unused)419 int __init start_secondary(void *unused)
420 {
421 cpu_init();
422 preempt_disable();
423 smp_callin();
424 while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
425 cpu_relax();
426
427 smp_online();
428
429 /*
430 * low-memory mappings have been cleared, flush them from
431 * the local TLBs too.
432 */
433 local_flush_tlb_all();
434
435 cpu_startup_entry(CPUHP_ONLINE);
436 return 0;
437 }
438
439 /*==========================================================================*
440 * Name: smp_callin
441 *
442 * Description: This routine activate a secondary processor.
443 *
444 * Born on Date: 2002.02.05
445 *
446 * Arguments: NONE
447 *
448 * Returns: void (cannot fail)
449 *
450 * Modification log:
451 * Date Who Description
452 * ---------- --- --------------------------------------------------------
453 * 2003-06-24 hy modify for linux-2.5.69
454 *
455 *==========================================================================*/
smp_callin(void)456 static void __init smp_callin(void)
457 {
458 int phys_id = hard_smp_processor_id();
459 int cpu_id = smp_processor_id();
460 unsigned long timeout;
461
462 if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
463 printk("huh, phys CPU#%d, CPU#%d already present??\n",
464 phys_id, cpu_id);
465 BUG();
466 }
467 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
468
469 /* Waiting 2s total for startup (udelay is not yet working) */
470 timeout = jiffies + (2 * HZ);
471 while (time_before(jiffies, timeout)) {
472 /* Has the boot CPU finished it's STARTUP sequence ? */
473 if (cpumask_test_cpu(cpu_id, &cpu_callout_map))
474 break;
475 cpu_relax();
476 }
477
478 if (!time_before(jiffies, timeout)) {
479 printk("BUG: CPU#%d started up but did not get a callout!\n",
480 cpu_id);
481 BUG();
482 }
483
484 /* Allow the master to continue. */
485 cpumask_set_cpu(cpu_id, &cpu_callin_map);
486 }
487
smp_online(void)488 static void __init smp_online(void)
489 {
490 int cpu_id = smp_processor_id();
491
492 notify_cpu_starting(cpu_id);
493
494 local_irq_enable();
495
496 /* Get our bogomips. */
497 calibrate_delay();
498
499 /* Save our processor parameters */
500 smp_store_cpu_info(cpu_id);
501
502 set_cpu_online(cpu_id, true);
503 }
504
505 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
506 /* Boot up CPUs common Routines */
507 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
show_mp_info(int nr_cpu)508 static void __init show_mp_info(int nr_cpu)
509 {
510 int i;
511 char cpu_model0[17], cpu_model1[17], cpu_ver[9];
512
513 strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
514 strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
515 strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
516
517 cpu_model0[16] = '\0';
518 for (i = 15 ; i >= 0 ; i--) {
519 if (cpu_model0[i] != ' ')
520 break;
521 cpu_model0[i] = '\0';
522 }
523 cpu_model1[16] = '\0';
524 for (i = 15 ; i >= 0 ; i--) {
525 if (cpu_model1[i] != ' ')
526 break;
527 cpu_model1[i] = '\0';
528 }
529 cpu_ver[8] = '\0';
530 for (i = 7 ; i >= 0 ; i--) {
531 if (cpu_ver[i] != ' ')
532 break;
533 cpu_ver[i] = '\0';
534 }
535
536 printk(KERN_INFO "M32R-mp information\n");
537 printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu);
538 printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0,
539 cpu_model1, cpu_ver);
540 }
541
542 /*
543 * The bootstrap kernel entry code has set these up. Save them for
544 * a given CPU
545 */
smp_store_cpu_info(int cpu_id)546 static void __init smp_store_cpu_info(int cpu_id)
547 {
548 struct cpuinfo_m32r *ci = cpu_data + cpu_id;
549
550 *ci = boot_cpu_data;
551 ci->loops_per_jiffy = loops_per_jiffy;
552 }
553
show_cpu_info(int cpu_id)554 static void __init show_cpu_info(int cpu_id)
555 {
556 struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
557
558 printk("CPU#%d : ", cpu_id);
559
560 #define PRINT_CLOCK(name, value) \
561 printk(name " clock %d.%02dMHz", \
562 ((value) / 1000000), ((value) % 1000000) / 10000)
563
564 PRINT_CLOCK("CPU", (int)ci->cpu_clock);
565 PRINT_CLOCK(", Bus", (int)ci->bus_clock);
566 printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
567 }
568
569 /*
570 * the frequency of the profiling timer can be changed
571 * by writing a multiplier value into /proc/profile.
572 */
setup_profiling_timer(unsigned int multiplier)573 int setup_profiling_timer(unsigned int multiplier)
574 {
575 int i;
576
577 /*
578 * Sanity check. [at least 500 APIC cycles should be
579 * between APIC interrupts as a rule of thumb, to avoid
580 * irqs flooding us]
581 */
582 if ( (!multiplier) || (calibration_result / multiplier < 500))
583 return -EINVAL;
584
585 /*
586 * Set the new multiplier for each CPU. CPUs don't start using the
587 * new values until the next timer interrupt in which they do process
588 * accounting. At that time they also adjust their APIC timers
589 * accordingly.
590 */
591 for_each_possible_cpu(i)
592 per_cpu(prof_multiplier, i) = multiplier;
593
594 return 0;
595 }
596
597 /* Initialize all maps between cpu number and apicids */
init_cpu_to_physid(void)598 static void __init init_cpu_to_physid(void)
599 {
600 int i;
601
602 for (i = 0 ; i < NR_CPUS ; i++) {
603 cpu_2_physid[i] = -1;
604 physid_2_cpu[i] = -1;
605 }
606 }
607
608 /*
609 * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
610 * else physical apic ids
611 */
map_cpu_to_physid(int cpu_id,int phys_id)612 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
613 {
614 physid_2_cpu[phys_id] = cpu_id;
615 cpu_2_physid[cpu_id] = phys_id;
616 }
617
618 /*
619 * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
620 * else physical apic ids
621 */
unmap_cpu_to_physid(int cpu_id,int phys_id)622 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
623 {
624 physid_2_cpu[phys_id] = -1;
625 cpu_2_physid[cpu_id] = -1;
626 }
627