2 * linux/arch/m32r/kernel/smpboot.c
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
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
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/config.h>
43 #include <linux/init.h>
45 #include <linux/smp_lock.h>
46 #include <linux/irq.h>
47 #include <linux/bootmem.h>
48 #include <linux/delay.h>
51 #include <asm/pgalloc.h>
52 #include <asm/tlbflush.h>
56 #define Dprintk(x...) printk(x)
61 extern cpumask_t cpu_initialized;
63 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
64 /* Data structures and variables */
65 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
67 /* Processor that is doing the boot up */
68 static unsigned int bsp_phys_id = -1;
70 /* Bitmask of physically existing CPUs */
71 physid_mask_t phys_cpu_present_map;
73 /* Bitmask of currently online CPUs */
74 cpumask_t cpu_online_map;
76 cpumask_t cpu_bootout_map;
77 cpumask_t cpu_bootin_map;
78 cpumask_t cpu_callout_map;
79 static cpumask_t cpu_callin_map;
81 /* Per CPU bogomips and other parameters */
82 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
85 static cpumask_t smp_commenced_mask;
92 /* which physical physical ID maps to which logical CPU number */
93 static volatile int physid_2_cpu[NR_CPUS];
94 #define physid_to_cpu(physid) physid_2_cpu[physid]
96 /* which logical CPU number maps to which physical ID */
97 volatile int cpu_2_physid[NR_CPUS];
99 DEFINE_PER_CPU(int, prof_multiplier) = 1;
100 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
101 DEFINE_PER_CPU(int, prof_counter) = 1;
103 spinlock_t ipi_lock[NR_IPIS];
105 static unsigned int calibration_result;
107 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
108 /* Function Prototypes */
109 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
111 void smp_prepare_boot_cpu(void);
112 void smp_prepare_cpus(unsigned int);
113 static void smp_tune_scheduling(void);
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 Routins : 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 cpu_set(0, cpu_online_map); /* BSP's cpu_id == 0 */
139 cpu_set(0, cpu_callout_map);
140 cpu_set(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
159 * Returns: void (cannot fail)
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)
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]",
178 for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
179 physid_set(phys_id, phys_cpu_present_map);
181 show_mp_info(nr_cpu);
186 * Setup boot CPU information
188 smp_store_cpu_info(0); /* Final full version of the data */
189 smp_tune_scheduling();
192 * If SMP should be disabled, then really disable it!
195 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
200 * Now scan the CPU present map and fire up the other CPUs.
202 Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
204 for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
206 * Don't even attempt to start the boot CPU!
208 if (phys_id == bsp_phys_id)
211 if (!physid_isset(phys_id, phys_cpu_present_map))
214 if ((max_cpus >= 0) && (max_cpus <= cpucount + 1))
217 do_boot_cpu(phys_id);
220 * Make sure we unmap all failed CPUs
222 if (physid_to_cpu(phys_id) == -1) {
223 physid_clear(phys_id, phys_cpu_present_map);
224 printk("phys CPU#%d not responding - " \
225 "cannot use it.\n", phys_id);
230 Dprintk("Boot done.\n");
233 static void __init smp_tune_scheduling(void)
239 * init_ipi_lock : Initialize IPI locks.
241 static void __init init_ipi_lock(void)
245 for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
246 spin_lock_init(&ipi_lock[ipi]);
249 /*==========================================================================*
252 * Description: This routine boot up one AP.
254 * Born on Date: 2002.02.05
256 * Arguments: phys_id - Target CPU physical ID
258 * Returns: void (cannot fail)
261 * Date Who Description
262 * ---------- --- --------------------------------------------------------
263 * 2003-06-24 hy modify for linux-2.5.69
265 *==========================================================================*/
266 static void __init do_boot_cpu(int phys_id)
268 struct task_struct *idle;
269 unsigned long send_status, boot_status;
275 * We can't use kernel_thread since we must avoid to
276 * reschedule the child.
278 idle = fork_idle(cpu_id);
280 panic("failed fork for CPU#%d.", cpu_id);
282 idle->thread.lr = (unsigned long)start_secondary;
284 map_cpu_to_physid(cpu_id, phys_id);
286 /* So we see what's up */
287 printk("Booting processor %d/%d\n", phys_id, cpu_id);
288 stack_start.spi = (void *)idle->thread.sp;
289 idle->thread_info->cpu = cpu_id;
293 * 1.IPI received by CPU#(phys_id).
294 * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
295 * 3.CPU#(phys_id) enter start_secondary()
300 cpu_set(phys_id, cpu_bootout_map);
302 /* Send Startup IPI */
303 send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0);
305 Dprintk("Waiting for send to finish...\n");
312 send_status = !cpu_isset(phys_id, cpu_bootin_map);
313 } while (send_status && (timeout++ < 100));
315 Dprintk("After Startup.\n");
319 * allow APs to start initializing.
321 Dprintk("Before Callout %d.\n", cpu_id);
322 cpu_set(cpu_id, cpu_callout_map);
323 Dprintk("After Callout %d.\n", cpu_id);
326 * Wait 5s total for a response
328 for (timeout = 0; timeout < 5000; timeout++) {
329 if (cpu_isset(cpu_id, cpu_callin_map))
330 break; /* It has booted */
334 if (cpu_isset(cpu_id, cpu_callin_map)) {
335 /* number CPUs logically, starting from 1 (BSP is 0) */
339 printk("Not responding.\n");
342 printk("IPI never delivered???\n");
344 if (send_status || boot_status) {
345 unmap_cpu_to_physid(cpu_id, phys_id);
346 cpu_clear(cpu_id, cpu_callout_map);
347 cpu_clear(cpu_id, cpu_callin_map);
348 cpu_clear(cpu_id, cpu_initialized);
353 int __devinit __cpu_up(unsigned int cpu_id)
357 cpu_set(cpu_id, smp_commenced_mask);
360 * Wait 5s total for a response
362 for (timeout = 0; timeout < 5000; timeout++) {
363 if (cpu_isset(cpu_id, cpu_online_map))
367 if (!cpu_isset(cpu_id, cpu_online_map))
373 void __init smp_cpus_done(unsigned int max_cpus)
376 unsigned long bogosum = 0;
378 for (timeout = 0; timeout < 5000; timeout++) {
379 if (cpus_equal(cpu_callin_map, cpu_online_map))
383 if (!cpus_equal(cpu_callin_map, cpu_online_map))
386 for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
387 show_cpu_info(cpu_id);
390 * Allow the user to impress friends.
392 Dprintk("Before bogomips.\n");
394 for_each_cpu_mask(cpu_id, cpu_online_map)
395 bogosum += cpu_data[cpu_id].loops_per_jiffy;
397 printk(KERN_INFO "Total of %d processors activated " \
398 "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
399 bogosum / (500000 / HZ),
400 (bogosum / (5000 / HZ)) % 100);
401 Dprintk("Before bogocount - setting activated=1.\n");
405 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
406 /* Activate a secondary processor Routins */
407 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
409 /*==========================================================================*
410 * Name: start_secondary
412 * Description: This routine activate a secondary processor.
414 * Born on Date: 2002.02.05
416 * Arguments: *unused - currently unused.
418 * Returns: void (cannot fail)
421 * Date Who Description
422 * ---------- --- --------------------------------------------------------
423 * 2003-06-24 hy modify for linux-2.5.69
425 *==========================================================================*/
426 int __init start_secondary(void *unused)
430 while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
436 * low-memory mappings have been cleared, flush them from
437 * the local TLBs too.
439 local_flush_tlb_all();
445 /*==========================================================================*
448 * Description: This routine activate a secondary processor.
450 * Born on Date: 2002.02.05
454 * Returns: void (cannot fail)
457 * Date Who Description
458 * ---------- --- --------------------------------------------------------
459 * 2003-06-24 hy modify for linux-2.5.69
461 *==========================================================================*/
462 static void __init smp_callin(void)
464 int phys_id = hard_smp_processor_id();
465 int cpu_id = smp_processor_id();
466 unsigned long timeout;
468 if (cpu_isset(cpu_id, cpu_callin_map)) {
469 printk("huh, phys CPU#%d, CPU#%d already present??\n",
473 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
475 /* Waiting 2s total for startup (udelay is not yet working) */
476 timeout = jiffies + (2 * HZ);
477 while (time_before(jiffies, timeout)) {
478 /* Has the boot CPU finished it's STARTUP sequence ? */
479 if (cpu_isset(cpu_id, cpu_callout_map))
484 if (!time_before(jiffies, timeout)) {
485 printk("BUG: CPU#%d started up but did not get a callout!\n",
490 /* Allow the master to continue. */
491 cpu_set(cpu_id, cpu_callin_map);
494 static void __init smp_online(void)
496 int cpu_id = smp_processor_id();
500 /* Get our bogomips. */
503 /* Save our processor parameters */
504 smp_store_cpu_info(cpu_id);
506 cpu_set(cpu_id, cpu_online_map);
509 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
510 /* Boot up CPUs common Routins */
511 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
512 static void __init show_mp_info(int nr_cpu)
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] != ' ')
525 cpu_model0[i] = '\0';
527 cpu_model1[16] = '\0';
528 for (i = 15 ; i >= 0 ; i--) {
529 if (cpu_model1[i] != ' ')
531 cpu_model1[i] = '\0';
534 for (i = 7 ; i >= 0 ; i--) {
535 if (cpu_ver[i] != ' ')
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
550 static void __init smp_store_cpu_info(int cpu_id)
552 struct cpuinfo_m32r *ci = cpu_data + cpu_id;
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)
582 * Sanity check. [at least 500 APIC cycles should be
583 * between APIC interrupts as a rule of thumb, to avoid
586 if ( (!multiplier) || (calibration_result / multiplier < 500))
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
595 for (i = 0; i < NR_CPUS; ++i)
596 per_cpu(prof_multiplier, i) = multiplier;
601 /* Initialize all maps between cpu number and apicids */
602 static void __init init_cpu_to_physid(void)
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;