1 /* mdesc.c: Sun4V machine description handling.
3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
5 #include <linux/kernel.h>
6 #include <linux/types.h>
7 #include <linux/bootmem.h>
8 #include <linux/log2.h>
9 #include <linux/list.h>
10 #include <linux/slab.h>
13 #include <asm/hypervisor.h>
14 #include <asm/mdesc.h>
16 #include <asm/oplib.h>
19 /* Unlike the OBP device tree, the machine description is a full-on
20 * DAG. An arbitrary number of ARCs are possible from one
21 * node to other nodes and thus we can't use the OBP device_node
22 * data structure to represent these nodes inside of the kernel.
24 * Actually, it isn't even a DAG, because there are back pointers
25 * which create cycles in the graph.
27 * mdesc_hdr and mdesc_elem describe the layout of the data structure
28 * we get from the Hypervisor.
31 u32 version; /* Transport version */
32 u32 node_sz; /* node block size */
33 u32 name_sz; /* name block size */
34 u32 data_sz; /* data block size */
35 } __attribute__((aligned(16)));
39 #define MD_LIST_END 0x00
41 #define MD_NODE_END 0x45
43 #define MD_PROP_ARC 0x61
44 #define MD_PROP_VAL 0x76
45 #define MD_PROP_STR 0x73
46 #define MD_PROP_DATA 0x64
59 struct mdesc_mem_ops {
60 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
61 void (*free)(struct mdesc_handle *handle);
65 struct list_head list;
66 struct mdesc_mem_ops *mops;
69 unsigned int handle_size;
70 struct mdesc_hdr mdesc;
73 static void mdesc_handle_init(struct mdesc_handle *hp,
74 unsigned int handle_size,
77 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
79 memset(hp, 0, handle_size);
80 INIT_LIST_HEAD(&hp->list);
82 atomic_set(&hp->refcnt, 1);
83 hp->handle_size = handle_size;
86 static struct mdesc_handle *mdesc_bootmem_alloc(unsigned int mdesc_size)
88 struct mdesc_handle *hp;
89 unsigned int handle_size, alloc_size;
91 handle_size = (sizeof(struct mdesc_handle) -
92 sizeof(struct mdesc_hdr) +
94 alloc_size = PAGE_ALIGN(handle_size);
96 hp = __alloc_bootmem(alloc_size, PAGE_SIZE, 0UL);
98 mdesc_handle_init(hp, handle_size, hp);
103 static void mdesc_bootmem_free(struct mdesc_handle *hp)
105 unsigned int alloc_size, handle_size = hp->handle_size;
106 unsigned long start, end;
108 BUG_ON(atomic_read(&hp->refcnt) != 0);
109 BUG_ON(!list_empty(&hp->list));
111 alloc_size = PAGE_ALIGN(handle_size);
113 start = (unsigned long) hp;
114 end = start + alloc_size;
116 while (start < end) {
119 p = virt_to_page(start);
120 ClearPageReserved(p);
126 static struct mdesc_mem_ops bootmem_mdesc_memops = {
127 .alloc = mdesc_bootmem_alloc,
128 .free = mdesc_bootmem_free,
131 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
133 unsigned int handle_size;
136 handle_size = (sizeof(struct mdesc_handle) -
137 sizeof(struct mdesc_hdr) +
140 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
142 struct mdesc_handle *hp;
145 addr = (unsigned long)base;
146 addr = (addr + 15UL) & ~15UL;
147 hp = (struct mdesc_handle *) addr;
149 mdesc_handle_init(hp, handle_size, base);
156 static void mdesc_kfree(struct mdesc_handle *hp)
158 BUG_ON(atomic_read(&hp->refcnt) != 0);
159 BUG_ON(!list_empty(&hp->list));
161 kfree(hp->self_base);
164 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
165 .alloc = mdesc_kmalloc,
169 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
170 struct mdesc_mem_ops *mops)
172 struct mdesc_handle *hp = mops->alloc(mdesc_size);
180 static void mdesc_free(struct mdesc_handle *hp)
185 static struct mdesc_handle *cur_mdesc;
186 static LIST_HEAD(mdesc_zombie_list);
187 static DEFINE_SPINLOCK(mdesc_lock);
189 struct mdesc_handle *mdesc_grab(void)
191 struct mdesc_handle *hp;
194 spin_lock_irqsave(&mdesc_lock, flags);
197 atomic_inc(&hp->refcnt);
198 spin_unlock_irqrestore(&mdesc_lock, flags);
202 EXPORT_SYMBOL(mdesc_grab);
204 void mdesc_release(struct mdesc_handle *hp)
208 spin_lock_irqsave(&mdesc_lock, flags);
209 if (atomic_dec_and_test(&hp->refcnt)) {
210 list_del_init(&hp->list);
213 spin_unlock_irqrestore(&mdesc_lock, flags);
215 EXPORT_SYMBOL(mdesc_release);
217 static DEFINE_MUTEX(mdesc_mutex);
218 static struct mdesc_notifier_client *client_list;
220 void mdesc_register_notifier(struct mdesc_notifier_client *client)
224 mutex_lock(&mdesc_mutex);
225 client->next = client_list;
226 client_list = client;
228 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
229 client->add(cur_mdesc, node);
231 mutex_unlock(&mdesc_mutex);
234 /* Run 'func' on nodes which are in A but not in B. */
235 static void invoke_on_missing(const char *name,
236 struct mdesc_handle *a,
237 struct mdesc_handle *b,
238 void (*func)(struct mdesc_handle *, u64))
242 mdesc_for_each_node_by_name(a, node, name) {
243 const u64 *id = mdesc_get_property(a, node, "id", NULL);
247 mdesc_for_each_node_by_name(b, fnode, name) {
248 const u64 *fid = mdesc_get_property(b, fnode,
261 static void notify_one(struct mdesc_notifier_client *p,
262 struct mdesc_handle *old_hp,
263 struct mdesc_handle *new_hp)
265 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
266 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
269 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
270 struct mdesc_handle *new_hp)
272 struct mdesc_notifier_client *p = client_list;
275 notify_one(p, old_hp, new_hp);
280 void mdesc_update(void)
282 unsigned long len, real_len, status;
283 struct mdesc_handle *hp, *orig_hp;
286 mutex_lock(&mdesc_mutex);
288 (void) sun4v_mach_desc(0UL, 0UL, &len);
290 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
292 printk(KERN_ERR "MD: mdesc alloc fails\n");
296 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
297 if (status != HV_EOK || real_len > len) {
298 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
300 atomic_dec(&hp->refcnt);
305 spin_lock_irqsave(&mdesc_lock, flags);
308 spin_unlock_irqrestore(&mdesc_lock, flags);
310 mdesc_notify_clients(orig_hp, hp);
312 spin_lock_irqsave(&mdesc_lock, flags);
313 if (atomic_dec_and_test(&orig_hp->refcnt))
316 list_add(&orig_hp->list, &mdesc_zombie_list);
317 spin_unlock_irqrestore(&mdesc_lock, flags);
320 mutex_unlock(&mdesc_mutex);
323 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
325 return (struct mdesc_elem *) (mdesc + 1);
328 static void *name_block(struct mdesc_hdr *mdesc)
330 return ((void *) node_block(mdesc)) + mdesc->node_sz;
333 static void *data_block(struct mdesc_hdr *mdesc)
335 return ((void *) name_block(mdesc)) + mdesc->name_sz;
338 u64 mdesc_node_by_name(struct mdesc_handle *hp,
339 u64 from_node, const char *name)
341 struct mdesc_elem *ep = node_block(&hp->mdesc);
342 const char *names = name_block(&hp->mdesc);
343 u64 last_node = hp->mdesc.node_sz / 16;
346 if (from_node == MDESC_NODE_NULL) {
348 } else if (from_node >= last_node) {
349 return MDESC_NODE_NULL;
351 ret = ep[from_node].d.val;
354 while (ret < last_node) {
355 if (ep[ret].tag != MD_NODE)
356 return MDESC_NODE_NULL;
357 if (!strcmp(names + ep[ret].name_offset, name))
361 if (ret >= last_node)
362 ret = MDESC_NODE_NULL;
365 EXPORT_SYMBOL(mdesc_node_by_name);
367 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
368 const char *name, int *lenp)
370 const char *names = name_block(&hp->mdesc);
371 u64 last_node = hp->mdesc.node_sz / 16;
372 void *data = data_block(&hp->mdesc);
373 struct mdesc_elem *ep;
375 if (node == MDESC_NODE_NULL || node >= last_node)
378 ep = node_block(&hp->mdesc) + node;
380 for (; ep->tag != MD_NODE_END; ep++) {
392 val = data + ep->d.data.data_offset;
393 len = ep->d.data.data_len;
402 if (!strcmp(names + ep->name_offset, name)) {
411 EXPORT_SYMBOL(mdesc_get_property);
413 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
415 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
416 const char *names = name_block(&hp->mdesc);
417 u64 last_node = hp->mdesc.node_sz / 16;
419 if (from == MDESC_NODE_NULL || from >= last_node)
420 return MDESC_NODE_NULL;
425 for (; ep->tag != MD_NODE_END; ep++) {
426 if (ep->tag != MD_PROP_ARC)
429 if (strcmp(names + ep->name_offset, arc_type))
435 return MDESC_NODE_NULL;
437 EXPORT_SYMBOL(mdesc_next_arc);
439 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
441 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
447 EXPORT_SYMBOL(mdesc_arc_target);
449 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
451 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
452 const char *names = name_block(&hp->mdesc);
453 u64 last_node = hp->mdesc.node_sz / 16;
455 if (node == MDESC_NODE_NULL || node >= last_node)
459 if (ep->tag != MD_NODE)
462 return names + ep->name_offset;
464 EXPORT_SYMBOL(mdesc_node_name);
466 static void __init report_platform_properties(void)
468 struct mdesc_handle *hp = mdesc_grab();
469 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
473 if (pn == MDESC_NODE_NULL) {
474 prom_printf("No platform node in machine-description.\n");
478 s = mdesc_get_property(hp, pn, "banner-name", NULL);
479 printk("PLATFORM: banner-name [%s]\n", s);
480 s = mdesc_get_property(hp, pn, "name", NULL);
481 printk("PLATFORM: name [%s]\n", s);
483 v = mdesc_get_property(hp, pn, "hostid", NULL);
485 printk("PLATFORM: hostid [%08lx]\n", *v);
486 v = mdesc_get_property(hp, pn, "serial#", NULL);
488 printk("PLATFORM: serial# [%08lx]\n", *v);
489 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
490 printk("PLATFORM: stick-frequency [%08lx]\n", *v);
491 v = mdesc_get_property(hp, pn, "mac-address", NULL);
493 printk("PLATFORM: mac-address [%lx]\n", *v);
494 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
496 printk("PLATFORM: watchdog-resolution [%lu ms]\n", *v);
497 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
499 printk("PLATFORM: watchdog-max-timeout [%lu ms]\n", *v);
500 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
502 printk("PLATFORM: max-cpus [%lu]\n", *v);
510 if (max_cpu > NR_CPUS)
515 for (i = 0; i < max_cpu; i++)
516 cpu_set(i, cpu_possible_map);
523 static int inline find_in_proplist(const char *list, const char *match, int len)
528 if (!strcmp(list, match))
530 l = strlen(list) + 1;
537 static void __devinit fill_in_one_cache(cpuinfo_sparc *c,
538 struct mdesc_handle *hp,
541 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
542 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
543 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
547 type = mdesc_get_property(hp, mp, "type", &type_len);
551 if (find_in_proplist(type, "instn", type_len)) {
552 c->icache_size = *size;
553 c->icache_line_size = *line_size;
554 } else if (find_in_proplist(type, "data", type_len)) {
555 c->dcache_size = *size;
556 c->dcache_line_size = *line_size;
561 c->ecache_size = *size;
562 c->ecache_line_size = *line_size;
572 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
573 u64 target = mdesc_arc_target(hp, a);
574 const char *name = mdesc_node_name(hp, target);
576 if (!strcmp(name, "cache"))
577 fill_in_one_cache(c, hp, target);
582 static void __devinit mark_core_ids(struct mdesc_handle *hp, u64 mp,
587 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
588 u64 t = mdesc_arc_target(hp, a);
592 name = mdesc_node_name(hp, t);
593 if (!strcmp(name, "cpu")) {
594 id = mdesc_get_property(hp, t, "id", NULL);
596 cpu_data(*id).core_id = core_id;
600 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
601 u64 n = mdesc_arc_target(hp, j);
604 n_name = mdesc_node_name(hp, n);
605 if (strcmp(n_name, "cpu"))
608 id = mdesc_get_property(hp, n, "id", NULL);
610 cpu_data(*id).core_id = core_id;
616 static void __devinit set_core_ids(struct mdesc_handle *hp)
622 mdesc_for_each_node_by_name(hp, mp, "cache") {
627 level = mdesc_get_property(hp, mp, "level", NULL);
631 type = mdesc_get_property(hp, mp, "type", &len);
632 if (!find_in_proplist(type, "instn", len))
635 mark_core_ids(hp, mp, idx);
641 static void __devinit mark_proc_ids(struct mdesc_handle *hp, u64 mp,
646 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
647 u64 t = mdesc_arc_target(hp, a);
651 name = mdesc_node_name(hp, t);
652 if (strcmp(name, "cpu"))
655 id = mdesc_get_property(hp, t, "id", NULL);
657 cpu_data(*id).proc_id = proc_id;
661 static void __devinit __set_proc_ids(struct mdesc_handle *hp,
662 const char *exec_unit_name)
668 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
672 type = mdesc_get_property(hp, mp, "type", &len);
673 if (!find_in_proplist(type, "int", len) &&
674 !find_in_proplist(type, "integer", len))
677 mark_proc_ids(hp, mp, idx);
683 static void __devinit set_proc_ids(struct mdesc_handle *hp)
685 __set_proc_ids(hp, "exec_unit");
686 __set_proc_ids(hp, "exec-unit");
689 static void __devinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
698 if (!val || val >= 64)
701 *mask = ((1U << val) * 64U) - 1U;
705 *mask = ((1U << def) * 64U) - 1U;
708 static void __devinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
709 struct trap_per_cpu *tb)
713 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
714 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
716 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
717 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
719 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
720 get_one_mondo_bits(val, &tb->resum_qmask, 6);
722 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
723 get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
726 void __devinit mdesc_fill_in_cpu_data(cpumask_t mask)
728 struct mdesc_handle *hp = mdesc_grab();
732 mdesc_for_each_node_by_name(hp, mp, "cpu") {
733 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
734 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
735 struct trap_per_cpu *tb;
745 if (cpuid >= NR_CPUS)
747 if (!cpu_isset(cpuid, mask))
750 /* On uniprocessor we only want the values for the
751 * real physical cpu the kernel booted onto, however
752 * cpu_data() only has one entry at index 0.
754 if (cpuid != real_hard_smp_processor_id())
759 c = &cpu_data(cpuid);
760 c->clock_tick = *cfreq;
762 tb = &trap_block[cpuid];
763 get_mondo_data(hp, mp, tb);
765 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
766 u64 j, t = mdesc_arc_target(hp, a);
769 t_name = mdesc_node_name(hp, t);
770 if (!strcmp(t_name, "cache")) {
771 fill_in_one_cache(c, hp, t);
775 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
776 u64 n = mdesc_arc_target(hp, j);
779 n_name = mdesc_node_name(hp, n);
780 if (!strcmp(n_name, "cache"))
781 fill_in_one_cache(c, hp, n);
786 cpu_set(cpuid, cpu_present_map);
794 sparc64_multi_core = 1;
800 smp_fill_in_sib_core_maps();
805 void __init sun4v_mdesc_init(void)
807 struct mdesc_handle *hp;
808 unsigned long len, real_len, status;
811 (void) sun4v_mach_desc(0UL, 0UL, &len);
813 printk("MDESC: Size is %lu bytes.\n", len);
815 hp = mdesc_alloc(len, &bootmem_mdesc_memops);
817 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
821 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
822 if (status != HV_EOK || real_len > len) {
823 prom_printf("sun4v_mach_desc fails, err(%lu), "
824 "len(%lu), real_len(%lu)\n",
825 status, len, real_len);
832 report_platform_properties();
835 mdesc_fill_in_cpu_data(mask);