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[PATCH] s390: fix preempt_count of idle thread with cpu hotplug
[deliverable/linux.git] / arch / s390 / kernel / setup.c
CommitLineData
1da177e4
LT		 1/*
2 * arch/s390/kernel/setup.c
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
11 */
12
13/*
14 * This file handles the architecture-dependent parts of initialization
15 */
16
17#include <linux/errno.h>
18#include <linux/module.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/stddef.h>
23#include <linux/unistd.h>
24#include <linux/ptrace.h>
25#include <linux/slab.h>
26#include <linux/user.h>
27#include <linux/a.out.h>
28#include <linux/tty.h>
29#include <linux/ioport.h>
30#include <linux/delay.h>
31#include <linux/config.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/seq_file.h>
38#include <linux/kernel_stat.h>
1e8e3383 39#include <linux/device.h>
1da177e4
LT		 40
41#include <asm/uaccess.h>
42#include <asm/system.h>
43#include <asm/smp.h>
44#include <asm/mmu_context.h>
45#include <asm/cpcmd.h>
46#include <asm/lowcore.h>
47#include <asm/irq.h>
0b642ede
PO		 48#include <asm/page.h>
49#include <asm/ptrace.h>
1da177e4
LT		 50
51/*
52 * Machine setup..
53 */
54unsigned int console_mode = 0;
55unsigned int console_devno = -1;
56unsigned int console_irq = -1;
57unsigned long memory_size = 0;
58unsigned long machine_flags = 0;
1da177e4
LT		 59struct {
60 unsigned long addr, size, type;
61} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
62#define CHUNK_READ_WRITE 0
63#define CHUNK_READ_ONLY 1
64volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
c9e37353
HC		 65unsigned long __initdata zholes_size[MAX_NR_ZONES];
66static unsigned long __initdata memory_end;
1da177e4
LT		 67
68/*
69 * Setup options
70 */
71extern int _text,_etext, _edata, _end;
72
73/*
74 * This is set up by the setup-routine at boot-time
75 * for S390 need to find out, what we have to setup
76 * using address 0x10400 ...
77 */
78
79#include <asm/setup.h>
80
81static char command_line[COMMAND_LINE_SIZE] = { 0, };
82
83static struct resource code_resource = {
84 .name = "Kernel code",
c9e37353
HC		 85 .start = (unsigned long) &_text,
86 .end = (unsigned long) &_etext - 1,
1da177e4
LT		 87 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
88};
89
90static struct resource data_resource = {
91 .name = "Kernel data",
c9e37353
HC		 92 .start = (unsigned long) &_etext,
93 .end = (unsigned long) &_edata - 1,
1da177e4
LT		 94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
95};
96
97/*
98 * cpu_init() initializes state that is per-CPU.
99 */
100void __devinit cpu_init (void)
101{
102 int addr = hard_smp_processor_id();
103
104 /*
105 * Store processor id in lowcore (used e.g. in timer_interrupt)
106 */
107 asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
108 S390_lowcore.cpu_data.cpu_addr = addr;
109
110 /*
111 * Force FPU initialization:
112 */
113 clear_thread_flag(TIF_USEDFPU);
114 clear_used_math();
115
116 atomic_inc(&init_mm.mm_count);
117 current->active_mm = &init_mm;
118 if (current->mm)
119 BUG();
120 enter_lazy_tlb(&init_mm, current);
121}
122
123/*
124 * VM halt and poweroff setup routines
125 */
126char vmhalt_cmd[128] = "";
127char vmpoff_cmd[128] = "";
128
129static inline void strncpy_skip_quote(char *dst, char *src, int n)
130{
131 int sx, dx;
132
133 dx = 0;
134 for (sx = 0; src[sx] != 0; sx++) {
135 if (src[sx] == '"') continue;
136 dst[dx++] = src[sx];
137 if (dx >= n) break;
138 }
139}
140
141static int __init vmhalt_setup(char *str)
142{
143 strncpy_skip_quote(vmhalt_cmd, str, 127);
144 vmhalt_cmd[127] = 0;
145 return 1;
146}
147
148__setup("vmhalt=", vmhalt_setup);
149
150static int __init vmpoff_setup(char *str)
151{
152 strncpy_skip_quote(vmpoff_cmd, str, 127);
153 vmpoff_cmd[127] = 0;
154 return 1;
155}
156
157__setup("vmpoff=", vmpoff_setup);
158
159/*
160 * condev= and conmode= setup parameter.
161 */
162
163static int __init condev_setup(char *str)
164{
165 int vdev;
166
167 vdev = simple_strtoul(str, &str, 0);
168 if (vdev >= 0 && vdev < 65536) {
169 console_devno = vdev;
170 console_irq = -1;
171 }
172 return 1;
173}
174
175__setup("condev=", condev_setup);
176
177static int __init conmode_setup(char *str)
178{
179#if defined(CONFIG_SCLP_CONSOLE)
180 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
181 SET_CONSOLE_SCLP;
182#endif
183#if defined(CONFIG_TN3215_CONSOLE)
184 if (strncmp(str, "3215", 5) == 0)
185 SET_CONSOLE_3215;
186#endif
187#if defined(CONFIG_TN3270_CONSOLE)
188 if (strncmp(str, "3270", 5) == 0)
189 SET_CONSOLE_3270;
190#endif
191 return 1;
192}
193
194__setup("conmode=", conmode_setup);
195
196static void __init conmode_default(void)
197{
198 char query_buffer[1024];
199 char *ptr;
200
201 if (MACHINE_IS_VM) {
6b979de3 202 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
1da177e4
LT		 203 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
204 ptr = strstr(query_buffer, "SUBCHANNEL =");
205 console_irq = simple_strtoul(ptr + 13, NULL, 16);
6b979de3 206 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
1da177e4
LT		 207 ptr = strstr(query_buffer, "CONMODE");
208 /*
209 * Set the conmode to 3215 so that the device recognition
210 * will set the cu_type of the console to 3215. If the
211 * conmode is 3270 and we don't set it back then both
212 * 3215 and the 3270 driver will try to access the console
213 * device (3215 as console and 3270 as normal tty).
214 */
6b979de3 215 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
1da177e4
LT		 216 if (ptr == NULL) {
217#if defined(CONFIG_SCLP_CONSOLE)
218 SET_CONSOLE_SCLP;
219#endif
220 return;
221 }
222 if (strncmp(ptr + 8, "3270", 4) == 0) {
223#if defined(CONFIG_TN3270_CONSOLE)
224 SET_CONSOLE_3270;
225#elif defined(CONFIG_TN3215_CONSOLE)
226 SET_CONSOLE_3215;
227#elif defined(CONFIG_SCLP_CONSOLE)
228 SET_CONSOLE_SCLP;
229#endif
230 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
231#if defined(CONFIG_TN3215_CONSOLE)
232 SET_CONSOLE_3215;
233#elif defined(CONFIG_TN3270_CONSOLE)
234 SET_CONSOLE_3270;
235#elif defined(CONFIG_SCLP_CONSOLE)
236 SET_CONSOLE_SCLP;
237#endif
238 }
239 } else if (MACHINE_IS_P390) {
240#if defined(CONFIG_TN3215_CONSOLE)
241 SET_CONSOLE_3215;
242#elif defined(CONFIG_TN3270_CONSOLE)
243 SET_CONSOLE_3270;
244#endif
245 } else {
246#if defined(CONFIG_SCLP_CONSOLE)
247 SET_CONSOLE_SCLP;
248#endif
249 }
250}
251
252#ifdef CONFIG_SMP
253extern void machine_restart_smp(char *);
254extern void machine_halt_smp(void);
255extern void machine_power_off_smp(void);
256
257void (*_machine_restart)(char *command) = machine_restart_smp;
258void (*_machine_halt)(void) = machine_halt_smp;
259void (*_machine_power_off)(void) = machine_power_off_smp;
260#else
261/*
262 * Reboot, halt and power_off routines for non SMP.
263 */
264extern void reipl(unsigned long devno);
c782268b 265extern void reipl_diag(void);
1da177e4
LT		 266static void do_machine_restart_nonsmp(char * __unused)
267{
c782268b
VS		 268 reipl_diag();
269
1da177e4 270 if (MACHINE_IS_VM)
68c11917 271 cpcmd ("IPL", NULL, 0, NULL);
1da177e4
LT		 272 else
273 reipl (0x10000 | S390_lowcore.ipl_device);
274}
275
276static void do_machine_halt_nonsmp(void)
277{
278 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
68c11917 279 cpcmd(vmhalt_cmd, NULL, 0, NULL);
1da177e4
LT		 280 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
281}
282
283static void do_machine_power_off_nonsmp(void)
284{
285 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
68c11917 286 cpcmd(vmpoff_cmd, NULL, 0, NULL);
1da177e4
LT		 287 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
288}
289
290void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
291void (*_machine_halt)(void) = do_machine_halt_nonsmp;
292void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
293#endif
294
295 /*
296 * Reboot, halt and power_off stubs. They just call _machine_restart,
297 * _machine_halt or _machine_power_off.
298 */
299
300void machine_restart(char *command)
301{
302 console_unblank();
303 _machine_restart(command);
304}
305
1da177e4
LT		 306void machine_halt(void)
307{
308 console_unblank();
309 _machine_halt();
310}
311
1da177e4
LT		 312void machine_power_off(void)
313{
314 console_unblank();
315 _machine_power_off();
316}
317
53df751c
MS		 318/*
319 * Dummy power off function.
320 */
321void (*pm_power_off)(void) = machine_power_off;
322
c9e37353
HC		 323static void __init
324add_memory_hole(unsigned long start, unsigned long end)
1da177e4 325{
c9e37353
HC		 326 unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
327
328 if (end <= dma_pfn)
329 zholes_size[ZONE_DMA] += end - start + 1;
330 else if (start > dma_pfn)
331 zholes_size[ZONE_NORMAL] += end - start + 1;
332 else {
333 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
334 zholes_size[ZONE_NORMAL] += end - dma_pfn;
335 }
336}
1da177e4 337
c9e37353
HC		 338static void __init
339parse_cmdline_early(char **cmdline_p)
340{
341 char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
342 unsigned long delay = 0;
1da177e4 343
c9e37353
HC		 344 /* Save unparsed command line copy for /proc/cmdline */
345 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
346 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
1da177e4 347
c9e37353
HC		 348 for (;;) {
349 /*
350 * "mem=XXX[kKmM]" sets memsize
351 */
352 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
353 memory_end = simple_strtoul(from+4, &from, 0);
354 if ( *from == 'K' || *from == 'k' ) {
355 memory_end = memory_end << 10;
356 from++;
357 } else if ( *from == 'M' || *from == 'm' ) {
358 memory_end = memory_end << 20;
359 from++;
360 }
361 }
362 /*
363 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
364 */
365 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
366 delay = simple_strtoul(from+9, &from, 0);
1da177e4
LT		 367 if (*from == 's' || *from == 'S') {
368 delay = delay*1000000;
369 from++;
370 } else if (*from == 'm' || *from == 'M') {
371 delay = delay*60*1000000;
372 from++;
373 }
374 /* now wait for the requested amount of time */
375 udelay(delay);
c9e37353
HC		 376 }
377 cn = *(from++);
378 if (!cn)
379 break;
380 if (cn == '\n')
381 cn = ' '; /* replace newlines with space */
1da177e4
LT		 382 if (cn == 0x0d)
383 cn = ' '; /* replace 0x0d with space */
c9e37353
HC		 384 if (cn == ' ' && c == ' ')
385 continue; /* remove additional spaces */
386 c = cn;
387 if (to - command_line >= COMMAND_LINE_SIZE)
388 break;
389 *(to++) = c;
390 }
391 if (c == ' ' && to > command_line) to--;
392 *to = '\0';
393 *cmdline_p = command_line;
394}
395
396static void __init
397setup_lowcore(void)
398{
399 struct _lowcore *lc;
400 int lc_pages;
401
402 /*
403 * Setup lowcore for boot cpu
404 */
405 lc_pages = sizeof(void *) == 8 ? 2 : 1;
406 lc = (struct _lowcore *)
407 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
408 memset(lc, 0, lc_pages * PAGE_SIZE);
0b642ede 409 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
c9e37353
HC		 410 lc->restart_psw.addr =
411 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
412 lc->external_new_psw.mask = PSW_KERNEL_BITS;
413 lc->external_new_psw.addr =
414 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
415 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
416 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
417 lc->program_new_psw.mask = PSW_KERNEL_BITS;
418 lc->program_new_psw.addr =
419 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
77fa2245
HC		 420 lc->mcck_new_psw.mask =
421 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
c9e37353
HC		 422 lc->mcck_new_psw.addr =
423 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
424 lc->io_new_psw.mask = PSW_KERNEL_BITS;
425 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
426 lc->ipl_device = S390_lowcore.ipl_device;
427 lc->jiffy_timer = -1LL;
428 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
429 lc->async_stack = (unsigned long)
430 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
c9e37353
HC		 431 lc->panic_stack = (unsigned long)
432 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
c9e37353
HC		 433 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
434 lc->thread_info = (unsigned long) &init_thread_union;
347a8dc3 435#ifndef CONFIG_64BIT
77fa2245
HC		 436 if (MACHINE_HAS_IEEE) {
437 lc->extended_save_area_addr = (__u32)
438 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
439 /* enable extended save area */
440 ctl_set_bit(14, 29);
441 }
442#endif
c9e37353
HC		 443 set_prefix((u32)(unsigned long) lc);
444}
445
446static void __init
447setup_resources(void)
448{
449 struct resource *res;
450 int i;
451
452 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
453 res = alloc_bootmem_low(sizeof(struct resource));
454 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
455 switch (memory_chunk[i].type) {
456 case CHUNK_READ_WRITE:
457 res->name = "System RAM";
458 break;
459 case CHUNK_READ_ONLY:
460 res->name = "System ROM";
461 res->flags |= IORESOURCE_READONLY;
462 break;
463 default:
464 res->name = "reserved";
465 }
466 res->start = memory_chunk[i].addr;
467 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
468 request_resource(&iomem_resource, res);
469 request_resource(res, &code_resource);
470 request_resource(res, &data_resource);
471 }
472}
473
474static void __init
475setup_memory(void)
476{
477 unsigned long bootmap_size;
0b642ede 478 unsigned long start_pfn, end_pfn, init_pfn;
c9e37353
HC		 479 unsigned long last_rw_end;
480 int i;
1da177e4
LT		 481
482 /*
483 * partially used pages are not usable - thus
484 * we are rounding upwards:
485 */
486 start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
487 end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
488
0b642ede
PO		 489 /* Initialize storage key for kernel pages */
490 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
491 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
492
1da177e4
LT		 493 /*
494 * Initialize the boot-time allocator (with low memory only):
495 */
496 bootmap_size = init_bootmem(start_pfn, end_pfn);
497
498 /*
499 * Register RAM areas with the bootmem allocator.
500 */
c9e37353
HC		 501 last_rw_end = start_pfn;
502
0b642ede 503 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
1da177e4
LT		 504 unsigned long start_chunk, end_chunk;
505
506 if (memory_chunk[i].type != CHUNK_READ_WRITE)
507 continue;
508 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
509 start_chunk >>= PAGE_SHIFT;
510 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
511 end_chunk >>= PAGE_SHIFT;
512 if (start_chunk < start_pfn)
513 start_chunk = start_pfn;
514 if (end_chunk > end_pfn)
515 end_chunk = end_pfn;
c9e37353 516 if (start_chunk < end_chunk) {
0b642ede
PO		 517 /* Initialize storage key for RAM pages */
518 for (init_pfn = start_chunk ; init_pfn < end_chunk;
519 init_pfn++)
520 page_set_storage_key(init_pfn << PAGE_SHIFT,
521 PAGE_DEFAULT_KEY);
1da177e4
LT		 522 free_bootmem(start_chunk << PAGE_SHIFT,
523 (end_chunk - start_chunk) << PAGE_SHIFT);
c9e37353
HC		 524 if (last_rw_end < start_chunk)
525 add_memory_hole(last_rw_end, start_chunk - 1);
526 last_rw_end = end_chunk;
527 }
1da177e4
LT		 528 }
529
0b642ede
PO		 530 psw_set_key(PAGE_DEFAULT_KEY);
531
c9e37353
HC		 532 if (last_rw_end < end_pfn - 1)
533 add_memory_hole(last_rw_end, end_pfn - 1);
534
535 /*
536 * Reserve the bootmem bitmap itself as well. We do this in two
537 * steps (first step was init_bootmem()) because this catches
538 * the (very unlikely) case of us accidentally initializing the
539 * bootmem allocator with an invalid RAM area.
540 */
541 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
1da177e4
LT		 542
543#ifdef CONFIG_BLK_DEV_INITRD
c9e37353 544 if (INITRD_START) {
1da177e4
LT		 545 if (INITRD_START + INITRD_SIZE <= memory_end) {
546 reserve_bootmem(INITRD_START, INITRD_SIZE);
547 initrd_start = INITRD_START;
548 initrd_end = initrd_start + INITRD_SIZE;
549 } else {
c9e37353
HC		 550 printk("initrd extends beyond end of memory "
551 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
552 initrd_start + INITRD_SIZE, memory_end);
553 initrd_start = initrd_end = 0;
1da177e4 554 }
c9e37353 555 }
1da177e4 556#endif
c9e37353 557}
1da177e4 558
c9e37353
HC		 559/*
560 * Setup function called from init/main.c just after the banner
561 * was printed.
562 */
1da177e4 563
c9e37353
HC		 564void __init
565setup_arch(char **cmdline_p)
566{
1da177e4 567 /*
c9e37353 568 * print what head.S has found out about the machine
1da177e4 569 */
347a8dc3 570#ifndef CONFIG_64BIT
c9e37353
HC		 571 printk((MACHINE_IS_VM) ?
572 "We are running under VM (31 bit mode)\n" :
573 "We are running native (31 bit mode)\n");
574 printk((MACHINE_HAS_IEEE) ?
575 "This machine has an IEEE fpu\n" :
576 "This machine has no IEEE fpu\n");
347a8dc3 577#else /* CONFIG_64BIT */
c9e37353
HC		 578 printk((MACHINE_IS_VM) ?
579 "We are running under VM (64 bit mode)\n" :
580 "We are running native (64 bit mode)\n");
347a8dc3 581#endif /* CONFIG_64BIT */
c9e37353
HC		 582
583 ROOT_DEV = Root_RAM0;
347a8dc3 584#ifndef CONFIG_64BIT
c9e37353
HC		 585 memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
586 /*
587 * We need some free virtual space to be able to do vmalloc.
588 * On a machine with 2GB memory we make sure that we have at
589 * least 128 MB free space for vmalloc.
590 */
591 if (memory_end > 1920*1024*1024)
592 memory_end = 1920*1024*1024;
347a8dc3 593#else /* CONFIG_64BIT */
c9e37353 594 memory_end = memory_size & ~0x200000UL; /* detected in head.s */
347a8dc3 595#endif /* CONFIG_64BIT */
c9e37353
HC		 596
597 init_mm.start_code = PAGE_OFFSET;
598 init_mm.end_code = (unsigned long) &_etext;
599 init_mm.end_data = (unsigned long) &_edata;
600 init_mm.brk = (unsigned long) &_end;
601
602 parse_cmdline_early(cmdline_p);
603
604 setup_memory();
605 setup_resources();
606 setup_lowcore();
607
1da177e4
LT		 608 cpu_init();
609 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
610
611 /*
612 * Create kernel page tables and switch to virtual addressing.
613 */
614 paging_init();
615
616 /* Setup default console */
617 conmode_default();
618}
619
620void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
621{
622 printk("cpu %d "
623#ifdef CONFIG_SMP
624 "phys_idx=%d "
625#endif
626 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
627 cpuinfo->cpu_nr,
628#ifdef CONFIG_SMP
629 cpuinfo->cpu_addr,
630#endif
631 cpuinfo->cpu_id.version,
632 cpuinfo->cpu_id.ident,
633 cpuinfo->cpu_id.machine,
634 cpuinfo->cpu_id.unused);
635}
636
637/*
638 * show_cpuinfo - Get information on one CPU for use by procfs.
639 */
640
641static int show_cpuinfo(struct seq_file *m, void *v)
642{
643 struct cpuinfo_S390 *cpuinfo;
644 unsigned long n = (unsigned long) v - 1;
645
b7ae9dd8 646 preempt_disable();
1da177e4
LT		 647 if (!n) {
648 seq_printf(m, "vendor_id : IBM/S390\n"
649 "# processors : %i\n"
650 "bogomips per cpu: %lu.%02lu\n",
651 num_online_cpus(), loops_per_jiffy/(500000/HZ),
652 (loops_per_jiffy/(5000/HZ))%100);
653 }
654 if (cpu_online(n)) {
655#ifdef CONFIG_SMP
656 if (smp_processor_id() == n)
657 cpuinfo = &S390_lowcore.cpu_data;
658 else
659 cpuinfo = &lowcore_ptr[n]->cpu_data;
660#else
661 cpuinfo = &S390_lowcore.cpu_data;
662#endif
663 seq_printf(m, "processor %li: "
664 "version = %02X, "
665 "identification = %06X, "
666 "machine = %04X\n",
667 n, cpuinfo->cpu_id.version,
668 cpuinfo->cpu_id.ident,
669 cpuinfo->cpu_id.machine);
670 }
b7ae9dd8 671 preempt_enable();
1da177e4
LT		 672 return 0;
673}
674
675static void *c_start(struct seq_file *m, loff_t *pos)
676{
677 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
678}
679static void *c_next(struct seq_file *m, void *v, loff_t *pos)
680{
681 ++*pos;
682 return c_start(m, pos);
683}
684static void c_stop(struct seq_file *m, void *v)
685{
686}
687struct seq_operations cpuinfo_op = {
688 .start = c_start,
689 .next = c_next,
690 .stop = c_stop,
691 .show = show_cpuinfo,
692};
693
1e8e3383
HC		 694#define DEFINE_IPL_ATTR(_name, _format, _value) \
695static ssize_t ipl_##_name##_show(struct subsystem *subsys, \
696 char *page) \
697{ \
698 return sprintf(page, _format, _value); \
699} \
700static struct subsys_attribute ipl_##_name##_attr = \
701 __ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);
702
703DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
704 IPL_PARMBLOCK_START->fcp.wwpn);
705DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
706 IPL_PARMBLOCK_START->fcp.lun);
707DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
708 IPL_PARMBLOCK_START->fcp.bootprog);
709DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
710 IPL_PARMBLOCK_START->fcp.br_lba);
711
712enum ipl_type_type {
713 ipl_type_unknown,
714 ipl_type_ccw,
715 ipl_type_fcp,
716};
717
718static enum ipl_type_type
719get_ipl_type(void)
720{
721 struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
722
723 if (!IPL_DEVNO_VALID)
724 return ipl_type_unknown;
725 if (!IPL_PARMBLOCK_VALID)
726 return ipl_type_ccw;
727 if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
728 return ipl_type_unknown;
729 if (ipl->fcp.pbt != IPL_TYPE_FCP)
730 return ipl_type_unknown;
731 return ipl_type_fcp;
732}
733
734static ssize_t
735ipl_type_show(struct subsystem *subsys, char *page)
736{
737 switch (get_ipl_type()) {
738 case ipl_type_ccw:
739 return sprintf(page, "ccw\n");
740 case ipl_type_fcp:
741 return sprintf(page, "fcp\n");
742 default:
743 return sprintf(page, "unknown\n");
744 }
745}
746
747static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);
748
749static ssize_t
750ipl_device_show(struct subsystem *subsys, char *page)
751{
752 struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
753
754 switch (get_ipl_type()) {
755 case ipl_type_ccw:
756 return sprintf(page, "0.0.%04x\n", ipl_devno);
757 case ipl_type_fcp:
758 return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
759 default:
760 return 0;
761 }
762}
763
764static struct subsys_attribute ipl_device_attr =
765 __ATTR(device, S_IRUGO, ipl_device_show, NULL);
766
767static struct attribute *ipl_fcp_attrs[] = {
768 &ipl_type_attr.attr,
769 &ipl_device_attr.attr,
770 &ipl_wwpn_attr.attr,
771 &ipl_lun_attr.attr,
772 &ipl_bootprog_attr.attr,
773 &ipl_br_lba_attr.attr,
774 NULL,
775};
776
777static struct attribute_group ipl_fcp_attr_group = {
778 .attrs = ipl_fcp_attrs,
779};
780
781static struct attribute *ipl_ccw_attrs[] = {
782 &ipl_type_attr.attr,
783 &ipl_device_attr.attr,
784 NULL,
785};
786
787static struct attribute_group ipl_ccw_attr_group = {
788 .attrs = ipl_ccw_attrs,
789};
790
791static struct attribute *ipl_unknown_attrs[] = {
792 &ipl_type_attr.attr,
793 NULL,
794};
795
796static struct attribute_group ipl_unknown_attr_group = {
797 .attrs = ipl_unknown_attrs,
798};
799
800static ssize_t
801ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
802{
803 unsigned int size = IPL_PARMBLOCK_SIZE;
804
805 if (off > size)
806 return 0;
807 if (off + count > size)
808 count = size - off;
809
810 memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
811 return count;
812}
813
814static struct bin_attribute ipl_parameter_attr = {
815 .attr = {
816 .name = "binary_parameter",
817 .mode = S_IRUGO,
818 .owner = THIS_MODULE,
819 },
820 .size = PAGE_SIZE,
821 .read = &ipl_parameter_read,
822};
823
824static ssize_t
825ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
826{
827 unsigned int size = IPL_PARMBLOCK_START->fcp.scp_data_len;
828 void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;
829
830 if (off > size)
831 return 0;
832 if (off + count > size)
833 count = size - off;
834
835 memcpy(buf, scp_data + off, count);
836 return count;
837}
838
839static struct bin_attribute ipl_scp_data_attr = {
840 .attr = {
841 .name = "scp_data",
842 .mode = S_IRUGO,
843 .owner = THIS_MODULE,
844 },
845 .size = PAGE_SIZE,
846 .read = &ipl_scp_data_read,
847};
848
849static decl_subsys(ipl, NULL, NULL);
850
851static int __init
852ipl_device_sysfs_register(void) {
853 int rc;
854
855 rc = firmware_register(&ipl_subsys);
856 if (rc)
857 return rc;
858
859 switch (get_ipl_type()) {
860 case ipl_type_ccw:
861 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
862 break;
863 case ipl_type_fcp:
864 sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
865 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
866 &ipl_parameter_attr);
867 sysfs_create_bin_file(&ipl_subsys.kset.kobj,
868 &ipl_scp_data_attr);
869 break;
870 default:
871 sysfs_create_group(&ipl_subsys.kset.kobj,
872 &ipl_unknown_attr_group);
873 break;
874 }
875 return 0;
876}
877
878__initcall(ipl_device_sysfs_register);
Linux kernel - Deliverables
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