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Linux/arch/m32r/kernel/smpboot.c

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  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 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
130 void __devinit 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  *==========================================================================*/
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  */
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  *==========================================================================*/
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 
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 
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  *==========================================================================*/
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_idle();
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  *==========================================================================*/
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 
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 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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  */
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 
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  */
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 */
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  */
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  */
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 

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