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[pohmelfs.git] / arch / m32r / kernel / smpboot.c
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1 /*
2 * linux/arch/m32r/kernel/smpboot.c
3 * orig : i386 2.4.10
5 * M32R SMP booting functions
7 * Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto
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>
13 * Much of the core SMP work is based on previous work by Thomas Radke, to
14 * whom a great many thanks are extended.
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.
20 * This code is released under the GNU General Public License version 2 or
21 * later.
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
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>
53 #include <asm/io.h>
54 #include <asm/pgalloc.h>
55 #include <asm/tlbflush.h>
57 #define DEBUG_SMP
58 #ifdef DEBUG_SMP
59 #define Dprintk(x...) printk(x)
60 #else
61 #define Dprintk(x...)
62 #endif
64 extern cpumask_t cpu_initialized;
66 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
67 /* Data structures and variables */
68 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
70 /* Processor that is doing the boot up */
71 static unsigned int bsp_phys_id = -1;
73 /* Bitmask of physically existing CPUs */
74 physid_mask_t phys_cpu_present_map;
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);
82 /* Per CPU bogomips and other parameters */
83 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
85 static int cpucount;
86 static cpumask_t smp_commenced_mask;
88 extern struct {
89 void * spi;
90 unsigned short ss;
91 } stack_start;
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]
97 /* which logical CPU number maps to which physical ID */
98 volatile int cpu_2_physid[NR_CPUS];
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;
104 spinlock_t ipi_lock[NR_IPIS];
106 static unsigned int calibration_result;
108 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
109 /* Function Prototypes */
110 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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);
119 int start_secondary(void *);
120 static void smp_callin(void);
121 static void smp_online(void);
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);
131 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
132 /* Boot up APs Routines : BSP */
133 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
134 void __devinit smp_prepare_boot_cpu(void)
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);
143 * Initialize the logical to physical CPU number mapping
145 init_cpu_to_physid();
146 map_cpu_to_physid(0, bsp_phys_id);
147 current_thread_info()->cpu = 0;
150 /*==========================================================================*
151 * Name: smp_prepare_cpus (old smp_boot_cpus)
153 * Description: This routine boot up APs.
155 * Born on Date: 2002.02.05
157 * Arguments: NONE
159 * Returns: void (cannot fail)
161 * Modification log:
162 * Date Who Description
163 * ---------- --- --------------------------------------------------------
164 * 2003-06-24 hy modify for linux-2.5.69
166 *==========================================================================*/
167 void __init smp_prepare_cpus(unsigned int max_cpus)
169 int phys_id;
170 unsigned long nr_cpu;
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;
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
184 show_mp_info(nr_cpu);
186 init_ipi_lock();
189 * Setup boot CPU information
191 smp_store_cpu_info(0); /* Final full version of the data */
194 * If SMP should be disabled, then really disable it!
196 if (!max_cpus) {
197 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
198 goto smp_done;
202 * Now scan the CPU present map and fire up the other CPUs.
204 Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
206 for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
208 * Don't even attempt to start the boot CPU!
210 if (phys_id == bsp_phys_id)
211 continue;
213 if (!physid_isset(phys_id, phys_cpu_present_map))
214 continue;
216 if (max_cpus <= cpucount + 1)
217 continue;
219 do_boot_cpu(phys_id);
222 * Make sure we unmap all failed CPUs
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);
231 smp_done:
232 Dprintk("Boot done.\n");
236 * init_ipi_lock : Initialize IPI locks.
238 static void __init init_ipi_lock(void)
240 int ipi;
242 for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
243 spin_lock_init(&ipi_lock[ipi]);
246 /*==========================================================================*
247 * Name: do_boot_cpu
249 * Description: This routine boot up one AP.
251 * Born on Date: 2002.02.05
253 * Arguments: phys_id - Target CPU physical ID
255 * Returns: void (cannot fail)
257 * Modification log:
258 * Date Who Description
259 * ---------- --- --------------------------------------------------------
260 * 2003-06-24 hy modify for linux-2.5.69
262 *==========================================================================*/
263 static void __init do_boot_cpu(int phys_id)
265 struct task_struct *idle;
266 unsigned long send_status, boot_status;
267 int timeout, cpu_id;
269 cpu_id = ++cpucount;
272 * We can't use kernel_thread since we must avoid to
273 * reschedule the child.
275 idle = fork_idle(cpu_id);
276 if (IS_ERR(idle))
277 panic("failed fork for CPU#%d.", cpu_id);
279 idle->thread.lr = (unsigned long)start_secondary;
281 map_cpu_to_physid(cpu_id, phys_id);
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;
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()
294 send_status = 0;
295 boot_status = 0;
297 cpumask_set_cpu(phys_id, &cpu_bootout_map);
299 /* Send Startup IPI */
300 send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
302 Dprintk("Waiting for send to finish...\n");
303 timeout = 0;
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));
312 Dprintk("After Startup.\n");
314 if (!send_status) {
316 * allow APs to start initializing.
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);
323 * Wait 5s total for a response
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);
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");
338 } else
339 printk("IPI never delivered???\n");
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--;
350 int __cpuinit __cpu_up(unsigned int cpu_id)
352 int timeout;
354 cpumask_set_cpu(cpu_id, &smp_commenced_mask);
357 * Wait 5s total for a response
359 for (timeout = 0; timeout < 5000; timeout++) {
360 if (cpu_online(cpu_id))
361 break;
362 udelay(1000);
364 if (!cpu_online(cpu_id))
365 BUG();
367 return 0;
370 void __init smp_cpus_done(unsigned int max_cpus)
372 int cpu_id, timeout;
373 unsigned long bogosum = 0;
375 for (timeout = 0; timeout < 5000; timeout++) {
376 if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
377 break;
378 udelay(1000);
380 if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
381 BUG();
383 for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
384 show_cpu_info(cpu_id);
387 * Allow the user to impress friends.
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;
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");
402 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
403 /* Activate a secondary processor Routines */
404 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
406 /*==========================================================================*
407 * Name: start_secondary
409 * Description: This routine activate a secondary processor.
411 * Born on Date: 2002.02.05
413 * Arguments: *unused - currently unused.
415 * Returns: void (cannot fail)
417 * Modification log:
418 * Date Who Description
419 * ---------- --- --------------------------------------------------------
420 * 2003-06-24 hy modify for linux-2.5.69
422 *==========================================================================*/
423 int __init start_secondary(void *unused)
425 cpu_init();
426 preempt_disable();
427 smp_callin();
428 while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
429 cpu_relax();
431 smp_online();
434 * low-memory mappings have been cleared, flush them from
435 * the local TLBs too.
437 local_flush_tlb_all();
439 cpu_idle();
440 return 0;
443 /*==========================================================================*
444 * Name: smp_callin
446 * Description: This routine activate a secondary processor.
448 * Born on Date: 2002.02.05
450 * Arguments: NONE
452 * Returns: void (cannot fail)
454 * Modification log:
455 * Date Who Description
456 * ---------- --- --------------------------------------------------------
457 * 2003-06-24 hy modify for linux-2.5.69
459 *==========================================================================*/
460 static void __init smp_callin(void)
462 int phys_id = hard_smp_processor_id();
463 int cpu_id = smp_processor_id();
464 unsigned long timeout;
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();
471 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
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();
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();
488 /* Allow the master to continue. */
489 cpumask_set_cpu(cpu_id, &cpu_callin_map);
492 static void __init smp_online(void)
494 int cpu_id = smp_processor_id();
496 notify_cpu_starting(cpu_id);
498 local_irq_enable();
500 /* Get our bogomips. */
501 calibrate_delay();
503 /* Save our processor parameters */
504 smp_store_cpu_info(cpu_id);
506 set_cpu_online(cpu_id, true);
509 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
510 /* Boot up CPUs common Routines */
511 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
512 static void __init show_mp_info(int nr_cpu)
514 int i;
515 char cpu_model0[17], cpu_model1[17], cpu_ver[9];
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);
521 cpu_model0[16] = '\0';
522 for (i = 15 ; i >= 0 ; i--) {
523 if (cpu_model0[i] != ' ')
524 break;
525 cpu_model0[i] = '\0';
527 cpu_model1[16] = '\0';
528 for (i = 15 ; i >= 0 ; i--) {
529 if (cpu_model1[i] != ' ')
530 break;
531 cpu_model1[i] = '\0';
533 cpu_ver[8] = '\0';
534 for (i = 7 ; i >= 0 ; i--) {
535 if (cpu_ver[i] != ' ')
536 break;
537 cpu_ver[i] = '\0';
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);
547 * The bootstrap kernel entry code has set these up. Save them for
548 * a given CPU
550 static void __init smp_store_cpu_info(int cpu_id)
552 struct cpuinfo_m32r *ci = cpu_data + cpu_id;
554 *ci = boot_cpu_data;
555 ci->loops_per_jiffy = loops_per_jiffy;
558 static void __init show_cpu_info(int cpu_id)
560 struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
562 printk("CPU#%d : ", cpu_id);
564 #define PRINT_CLOCK(name, value) \
565 printk(name " clock %d.%02dMHz", \
566 ((value) / 1000000), ((value) % 1000000) / 10000)
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);
574 * the frequency of the profiling timer can be changed
575 * by writing a multiplier value into /proc/profile.
577 int setup_profiling_timer(unsigned int multiplier)
579 int i;
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]
586 if ( (!multiplier) || (calibration_result / multiplier < 500))
587 return -EINVAL;
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.
595 for_each_possible_cpu(i)
596 per_cpu(prof_multiplier, i) = multiplier;
598 return 0;
601 /* Initialize all maps between cpu number and apicids */
602 static void __init init_cpu_to_physid(void)
604 int i;
606 for (i = 0 ; i < NR_CPUS ; i++) {
607 cpu_2_physid[i] = -1;
608 physid_2_cpu[i] = -1;
613 * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
614 * else physical apic ids
616 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
618 physid_2_cpu[phys_id] = cpu_id;
619 cpu_2_physid[cpu_id] = phys_id;
623 * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
624 * else physical apic ids
626 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
628 physid_2_cpu[phys_id] = -1;
629 cpu_2_physid[cpu_id] = -1;