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 void smp_prepare_boot_cpu(void);
113 void smp_prepare_cpus(unsigned int);
114 static void init_ipi_lock(void);
115 static void do_boot_cpu(int);
116 int __cpu_up(unsigned int);
117 void smp_cpus_done(unsigned int);
118
119 int start_secondary(void *);
120 static void smp_callin(void);
121 static void smp_online(void);
122
123 static void show_mp_info(int);
124 static void smp_store_cpu_info(int);
125 static void show_cpu_info(int);
126 int setup_profiling_timer(unsigned int);
127 static void init_cpu_to_physid(void);
128 static void map_cpu_to_physid(int, int);
129 static void unmap_cpu_to_physid(int, int);
130
131 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
132 /* Boot up APs Routines : BSP */
133 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
smp_prepare_boot_cpu(void)134 void __devinit smp_prepare_boot_cpu(void)
135 {
136 bsp_phys_id = hard_smp_processor_id();
137 physid_set(bsp_phys_id, phys_cpu_present_map);
138 set_cpu_online(0, true); /* BSP's cpu_id == 0 */
139 cpumask_set_cpu(0, &cpu_callout_map);
140 cpumask_set_cpu(0, &cpu_callin_map);
141
142 /*
143 * Initialize the logical to physical CPU number mapping
144 */
145 init_cpu_to_physid();
146 map_cpu_to_physid(0, bsp_phys_id);
147 current_thread_info()->cpu = 0;
148 }
149
150 /*==========================================================================*
151 * Name: smp_prepare_cpus (old smp_boot_cpus)
152 *
153 * Description: This routine boot up APs.
154 *
155 * Born on Date: 2002.02.05
156 *
157 * Arguments: NONE
158 *
159 * Returns: void (cannot fail)
160 *
161 * Modification log:
162 * Date Who Description
163 * ---------- --- --------------------------------------------------------
164 * 2003-06-24 hy modify for linux-2.5.69
165 *
166 *==========================================================================*/
smp_prepare_cpus(unsigned int max_cpus)167 void __init smp_prepare_cpus(unsigned int max_cpus)
168 {
169 int phys_id;
170 unsigned long nr_cpu;
171
172 nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
173 if (nr_cpu > NR_CPUS) {
174 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
175 nr_cpu, NR_CPUS);
176 goto smp_done;
177 }
178 for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
179 physid_set(phys_id, phys_cpu_present_map);
180 #ifndef CONFIG_HOTPLUG_CPU
181 init_cpu_present(cpu_possible_mask);
182 #endif
183
184 show_mp_info(nr_cpu);
185
186 init_ipi_lock();
187
188 /*
189 * Setup boot CPU information
190 */
191 smp_store_cpu_info(0); /* Final full version of the data */
192
193 /*
194 * If SMP should be disabled, then really disable it!
195 */
196 if (!max_cpus) {
197 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
198 goto smp_done;
199 }
200
201 /*
202 * Now scan the CPU present map and fire up the other CPUs.
203 */
204 Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
205
206 for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
207 /*
208 * Don't even attempt to start the boot CPU!
209 */
210 if (phys_id == bsp_phys_id)
211 continue;
212
213 if (!physid_isset(phys_id, phys_cpu_present_map))
214 continue;
215
216 if (max_cpus <= cpucount + 1)
217 continue;
218
219 do_boot_cpu(phys_id);
220
221 /*
222 * Make sure we unmap all failed CPUs
223 */
224 if (physid_to_cpu(phys_id) == -1) {
225 physid_clear(phys_id, phys_cpu_present_map);
226 printk("phys CPU#%d not responding - " \
227 "cannot use it.\n", phys_id);
228 }
229 }
230
231 smp_done:
232 Dprintk("Boot done.\n");
233 }
234
235 /*
236 * init_ipi_lock : Initialize IPI locks.
237 */
init_ipi_lock(void)238 static void __init init_ipi_lock(void)
239 {
240 int ipi;
241
242 for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
243 spin_lock_init(&ipi_lock[ipi]);
244 }
245
246 /*==========================================================================*
247 * Name: do_boot_cpu
248 *
249 * Description: This routine boot up one AP.
250 *
251 * Born on Date: 2002.02.05
252 *
253 * Arguments: phys_id - Target CPU physical ID
254 *
255 * Returns: void (cannot fail)
256 *
257 * Modification log:
258 * Date Who Description
259 * ---------- --- --------------------------------------------------------
260 * 2003-06-24 hy modify for linux-2.5.69
261 *
262 *==========================================================================*/
do_boot_cpu(int phys_id)263 static void __init do_boot_cpu(int phys_id)
264 {
265 struct task_struct *idle;
266 unsigned long send_status, boot_status;
267 int timeout, cpu_id;
268
269 cpu_id = ++cpucount;
270
271 /*
272 * We can't use kernel_thread since we must avoid to
273 * reschedule the child.
274 */
275 idle = fork_idle(cpu_id);
276 if (IS_ERR(idle))
277 panic("failed fork for CPU#%d.", cpu_id);
278
279 idle->thread.lr = (unsigned long)start_secondary;
280
281 map_cpu_to_physid(cpu_id, phys_id);
282
283 /* So we see what's up */
284 printk("Booting processor %d/%d\n", phys_id, cpu_id);
285 stack_start.spi = (void *)idle->thread.sp;
286 task_thread_info(idle)->cpu = cpu_id;
287
288 /*
289 * Send Startup IPI
290 * 1.IPI received by CPU#(phys_id).
291 * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
292 * 3.CPU#(phys_id) enter start_secondary()
293 */
294 send_status = 0;
295 boot_status = 0;
296
297 cpumask_set_cpu(phys_id, &cpu_bootout_map);
298
299 /* Send Startup IPI */
300 send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
301
302 Dprintk("Waiting for send to finish...\n");
303 timeout = 0;
304
305 /* Wait 100[ms] */
306 do {
307 Dprintk("+");
308 udelay(1000);
309 send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
310 } while (send_status && (timeout++ < 100));
311
312 Dprintk("After Startup.\n");
313
314 if (!send_status) {
315 /*
316 * allow APs to start initializing.
317 */
318 Dprintk("Before Callout %d.\n", cpu_id);
319 cpumask_set_cpu(cpu_id, &cpu_callout_map);
320 Dprintk("After Callout %d.\n", cpu_id);
321
322 /*
323 * Wait 5s total for a response
324 */
325 for (timeout = 0; timeout < 5000; timeout++) {
326 if (cpumask_test_cpu(cpu_id, &cpu_callin_map))
327 break; /* It has booted */
328 udelay(1000);
329 }
330
331 if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
332 /* number CPUs logically, starting from 1 (BSP is 0) */
333 Dprintk("OK.\n");
334 } else {
335 boot_status = 1;
336 printk("Not responding.\n");
337 }
338 } else
339 printk("IPI never delivered???\n");
340
341 if (send_status || boot_status) {
342 unmap_cpu_to_physid(cpu_id, phys_id);
343 cpumask_clear_cpu(cpu_id, &cpu_callout_map);
344 cpumask_clear_cpu(cpu_id, &cpu_callin_map);
345 cpumask_clear_cpu(cpu_id, &cpu_initialized);
346 cpucount--;
347 }
348 }
349
__cpu_up(unsigned int cpu_id)350 int __cpuinit __cpu_up(unsigned int cpu_id)
351 {
352 int timeout;
353
354 cpumask_set_cpu(cpu_id, &smp_commenced_mask);
355
356 /*
357 * Wait 5s total for a response
358 */
359 for (timeout = 0; timeout < 5000; timeout++) {
360 if (cpu_online(cpu_id))
361 break;
362 udelay(1000);
363 }
364 if (!cpu_online(cpu_id))
365 BUG();
366
367 return 0;
368 }
369
smp_cpus_done(unsigned int max_cpus)370 void __init smp_cpus_done(unsigned int max_cpus)
371 {
372 int cpu_id, timeout;
373 unsigned long bogosum = 0;
374
375 for (timeout = 0; timeout < 5000; timeout++) {
376 if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
377 break;
378 udelay(1000);
379 }
380 if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
381 BUG();
382
383 for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
384 show_cpu_info(cpu_id);
385
386 /*
387 * Allow the user to impress friends.
388 */
389 Dprintk("Before bogomips.\n");
390 if (cpucount) {
391 for_each_cpu(cpu_id,cpu_online_mask)
392 bogosum += cpu_data[cpu_id].loops_per_jiffy;
393
394 printk(KERN_INFO "Total of %d processors activated " \
395 "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
396 bogosum / (500000 / HZ),
397 (bogosum / (5000 / HZ)) % 100);
398 Dprintk("Before bogocount - setting activated=1.\n");
399 }
400 }
401
402 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
403 /* Activate a secondary processor Routines */
404 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
405
406 /*==========================================================================*
407 * Name: start_secondary
408 *
409 * Description: This routine activate a secondary processor.
410 *
411 * Born on Date: 2002.02.05
412 *
413 * Arguments: *unused - currently unused.
414 *
415 * Returns: void (cannot fail)
416 *
417 * Modification log:
418 * Date Who Description
419 * ---------- --- --------------------------------------------------------
420 * 2003-06-24 hy modify for linux-2.5.69
421 *
422 *==========================================================================*/
start_secondary(void * unused)423 int __init start_secondary(void *unused)
424 {
425 cpu_init();
426 preempt_disable();
427 smp_callin();
428 while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
429 cpu_relax();
430
431 smp_online();
432
433 /*
434 * low-memory mappings have been cleared, flush them from
435 * the local TLBs too.
436 */
437 local_flush_tlb_all();
438
439 cpu_idle();
440 return 0;
441 }
442
443 /*==========================================================================*
444 * Name: smp_callin
445 *
446 * Description: This routine activate a secondary processor.
447 *
448 * Born on Date: 2002.02.05
449 *
450 * Arguments: NONE
451 *
452 * Returns: void (cannot fail)
453 *
454 * Modification log:
455 * Date Who Description
456 * ---------- --- --------------------------------------------------------
457 * 2003-06-24 hy modify for linux-2.5.69
458 *
459 *==========================================================================*/
smp_callin(void)460 static void __init smp_callin(void)
461 {
462 int phys_id = hard_smp_processor_id();
463 int cpu_id = smp_processor_id();
464 unsigned long timeout;
465
466 if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
467 printk("huh, phys CPU#%d, CPU#%d already present??\n",
468 phys_id, cpu_id);
469 BUG();
470 }
471 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
472
473 /* Waiting 2s total for startup (udelay is not yet working) */
474 timeout = jiffies + (2 * HZ);
475 while (time_before(jiffies, timeout)) {
476 /* Has the boot CPU finished it's STARTUP sequence ? */
477 if (cpumask_test_cpu(cpu_id, &cpu_callout_map))
478 break;
479 cpu_relax();
480 }
481
482 if (!time_before(jiffies, timeout)) {
483 printk("BUG: CPU#%d started up but did not get a callout!\n",
484 cpu_id);
485 BUG();
486 }
487
488 /* Allow the master to continue. */
489 cpumask_set_cpu(cpu_id, &cpu_callin_map);
490 }
491
smp_online(void)492 static void __init smp_online(void)
493 {
494 int cpu_id = smp_processor_id();
495
496 notify_cpu_starting(cpu_id);
497
498 local_irq_enable();
499
500 /* Get our bogomips. */
501 calibrate_delay();
502
503 /* Save our processor parameters */
504 smp_store_cpu_info(cpu_id);
505
506 set_cpu_online(cpu_id, true);
507 }
508
509 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
510 /* Boot up CPUs common Routines */
511 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
show_mp_info(int nr_cpu)512 static void __init show_mp_info(int nr_cpu)
513 {
514 int i;
515 char cpu_model0[17], cpu_model1[17], cpu_ver[9];
516
517 strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
518 strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
519 strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
520
521 cpu_model0[16] = '\0';
522 for (i = 15 ; i >= 0 ; i--) {
523 if (cpu_model0[i] != ' ')
524 break;
525 cpu_model0[i] = '\0';
526 }
527 cpu_model1[16] = '\0';
528 for (i = 15 ; i >= 0 ; i--) {
529 if (cpu_model1[i] != ' ')
530 break;
531 cpu_model1[i] = '\0';
532 }
533 cpu_ver[8] = '\0';
534 for (i = 7 ; i >= 0 ; i--) {
535 if (cpu_ver[i] != ' ')
536 break;
537 cpu_ver[i] = '\0';
538 }
539
540 printk(KERN_INFO "M32R-mp information\n");
541 printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu);
542 printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0,
543 cpu_model1, cpu_ver);
544 }
545
546 /*
547 * The bootstrap kernel entry code has set these up. Save them for
548 * a given CPU
549 */
smp_store_cpu_info(int cpu_id)550 static void __init smp_store_cpu_info(int cpu_id)
551 {
552 struct cpuinfo_m32r *ci = cpu_data + cpu_id;
553
554 *ci = boot_cpu_data;
555 ci->loops_per_jiffy = loops_per_jiffy;
556 }
557
show_cpu_info(int cpu_id)558 static void __init show_cpu_info(int cpu_id)
559 {
560 struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
561
562 printk("CPU#%d : ", cpu_id);
563
564 #define PRINT_CLOCK(name, value) \
565 printk(name " clock %d.%02dMHz", \
566 ((value) / 1000000), ((value) % 1000000) / 10000)
567
568 PRINT_CLOCK("CPU", (int)ci->cpu_clock);
569 PRINT_CLOCK(", Bus", (int)ci->bus_clock);
570 printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
571 }
572
573 /*
574 * the frequency of the profiling timer can be changed
575 * by writing a multiplier value into /proc/profile.
576 */
setup_profiling_timer(unsigned int multiplier)577 int setup_profiling_timer(unsigned int multiplier)
578 {
579 int i;
580
581 /*
582 * Sanity check. [at least 500 APIC cycles should be
583 * between APIC interrupts as a rule of thumb, to avoid
584 * irqs flooding us]
585 */
586 if ( (!multiplier) || (calibration_result / multiplier < 500))
587 return -EINVAL;
588
589 /*
590 * Set the new multiplier for each CPU. CPUs don't start using the
591 * new values until the next timer interrupt in which they do process
592 * accounting. At that time they also adjust their APIC timers
593 * accordingly.
594 */
595 for_each_possible_cpu(i)
596 per_cpu(prof_multiplier, i) = multiplier;
597
598 return 0;
599 }
600
601 /* Initialize all maps between cpu number and apicids */
init_cpu_to_physid(void)602 static void __init init_cpu_to_physid(void)
603 {
604 int i;
605
606 for (i = 0 ; i < NR_CPUS ; i++) {
607 cpu_2_physid[i] = -1;
608 physid_2_cpu[i] = -1;
609 }
610 }
611
612 /*
613 * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
614 * else physical apic ids
615 */
map_cpu_to_physid(int cpu_id,int phys_id)616 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
617 {
618 physid_2_cpu[phys_id] = cpu_id;
619 cpu_2_physid[cpu_id] = phys_id;
620 }
621
622 /*
623 * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
624 * else physical apic ids
625 */
unmap_cpu_to_physid(int cpu_id,int phys_id)626 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
627 {
628 physid_2_cpu[phys_id] = -1;
629 cpu_2_physid[cpu_id] = -1;
630 }
631