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>
12 #include <asm/hypervisor.h>
13 #include <asm/mdesc.h>
15 #include <asm/oplib.h>
18 /* Unlike the OBP device tree, the machine description is a full-on
19 * DAG. An arbitrary number of ARCs are possible from one
20 * node to other nodes and thus we can't use the OBP device_node
21 * data structure to represent these nodes inside of the kernel.
23 * Actually, it isn't even a DAG, because there are back pointers
24 * which create cycles in the graph.
26 * mdesc_hdr and mdesc_elem describe the layout of the data structure
27 * we get from the Hypervisor.
30 u32 version; /* Transport version */
31 u32 node_sz; /* node block size */
32 u32 name_sz; /* name block size */
33 u32 data_sz; /* data block size */
34 } __attribute__((aligned(16)));
38 #define MD_LIST_END 0x00
40 #define MD_NODE_END 0x45
42 #define MD_PROP_ARC 0x61
43 #define MD_PROP_VAL 0x76
44 #define MD_PROP_STR 0x73
45 #define MD_PROP_DATA 0x64
58 struct mdesc_mem_ops {
59 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
60 void (*free)(struct mdesc_handle *handle);
64 struct list_head list;
65 struct mdesc_mem_ops *mops;
68 unsigned int handle_size;
69 struct mdesc_hdr mdesc;
72 static void mdesc_handle_init(struct mdesc_handle *hp,
73 unsigned int handle_size,
76 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
78 memset(hp, 0, handle_size);
79 INIT_LIST_HEAD(&hp->list);
81 atomic_set(&hp->refcnt, 1);
82 hp->handle_size = handle_size;
85 static struct mdesc_handle *mdesc_bootmem_alloc(unsigned int mdesc_size)
87 struct mdesc_handle *hp;
88 unsigned int handle_size, alloc_size;
90 handle_size = (sizeof(struct mdesc_handle) -
91 sizeof(struct mdesc_hdr) +
93 alloc_size = PAGE_ALIGN(handle_size);
95 hp = __alloc_bootmem(alloc_size, PAGE_SIZE, 0UL);
97 mdesc_handle_init(hp, handle_size, hp);
102 static void mdesc_bootmem_free(struct mdesc_handle *hp)
104 unsigned int alloc_size, handle_size = hp->handle_size;
105 unsigned long start, end;
107 BUG_ON(atomic_read(&hp->refcnt) != 0);
108 BUG_ON(!list_empty(&hp->list));
110 alloc_size = PAGE_ALIGN(handle_size);
112 start = (unsigned long) hp;
113 end = start + alloc_size;
115 while (start < end) {
118 p = virt_to_page(start);
119 ClearPageReserved(p);
125 static struct mdesc_mem_ops bootmem_mdesc_memops = {
126 .alloc = mdesc_bootmem_alloc,
127 .free = mdesc_bootmem_free,
130 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
132 unsigned int handle_size;
135 handle_size = (sizeof(struct mdesc_handle) -
136 sizeof(struct mdesc_hdr) +
139 base = kmalloc(handle_size + 15, GFP_KERNEL);
141 struct mdesc_handle *hp;
144 addr = (unsigned long)base;
145 addr = (addr + 15UL) & ~15UL;
146 hp = (struct mdesc_handle *) addr;
148 mdesc_handle_init(hp, handle_size, base);
155 static void mdesc_kfree(struct mdesc_handle *hp)
157 BUG_ON(atomic_read(&hp->refcnt) != 0);
158 BUG_ON(!list_empty(&hp->list));
160 kfree(hp->self_base);
163 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
164 .alloc = mdesc_kmalloc,
168 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
169 struct mdesc_mem_ops *mops)
171 struct mdesc_handle *hp = mops->alloc(mdesc_size);
179 static void mdesc_free(struct mdesc_handle *hp)
184 static struct mdesc_handle *cur_mdesc;
185 static LIST_HEAD(mdesc_zombie_list);
186 static DEFINE_SPINLOCK(mdesc_lock);
188 struct mdesc_handle *mdesc_grab(void)
190 struct mdesc_handle *hp;
193 spin_lock_irqsave(&mdesc_lock, flags);
196 atomic_inc(&hp->refcnt);
197 spin_unlock_irqrestore(&mdesc_lock, flags);
201 EXPORT_SYMBOL(mdesc_grab);
203 void mdesc_release(struct mdesc_handle *hp)
207 spin_lock_irqsave(&mdesc_lock, flags);
208 if (atomic_dec_and_test(&hp->refcnt)) {
209 list_del_init(&hp->list);
212 spin_unlock_irqrestore(&mdesc_lock, flags);
214 EXPORT_SYMBOL(mdesc_release);
216 static void do_mdesc_update(struct work_struct *work)
218 unsigned long len, real_len, status;
219 struct mdesc_handle *hp, *orig_hp;
222 (void) sun4v_mach_desc(0UL, 0UL, &len);
224 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
226 printk(KERN_ERR "MD: mdesc alloc fails\n");
230 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
231 if (status != HV_EOK || real_len > len) {
232 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
234 atomic_dec(&hp->refcnt);
239 spin_lock_irqsave(&mdesc_lock, flags);
243 if (atomic_dec_and_test(&orig_hp->refcnt))
246 list_add(&orig_hp->list, &mdesc_zombie_list);
247 spin_unlock_irqrestore(&mdesc_lock, flags);
250 static DECLARE_WORK(mdesc_update_work, do_mdesc_update);
252 void mdesc_update(void)
254 schedule_work(&mdesc_update_work);
257 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
259 return (struct mdesc_elem *) (mdesc + 1);
262 static void *name_block(struct mdesc_hdr *mdesc)
264 return ((void *) node_block(mdesc)) + mdesc->node_sz;
267 static void *data_block(struct mdesc_hdr *mdesc)
269 return ((void *) name_block(mdesc)) + mdesc->name_sz;
272 u64 mdesc_node_by_name(struct mdesc_handle *hp,
273 u64 from_node, const char *name)
275 struct mdesc_elem *ep = node_block(&hp->mdesc);
276 const char *names = name_block(&hp->mdesc);
277 u64 last_node = hp->mdesc.node_sz / 16;
280 if (from_node == MDESC_NODE_NULL)
283 if (from_node >= last_node)
284 return MDESC_NODE_NULL;
286 ret = ep[from_node].d.val;
287 while (ret < last_node) {
288 if (ep[ret].tag != MD_NODE)
289 return MDESC_NODE_NULL;
290 if (!strcmp(names + ep[ret].name_offset, name))
294 if (ret >= last_node)
295 ret = MDESC_NODE_NULL;
298 EXPORT_SYMBOL(mdesc_node_by_name);
300 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
301 const char *name, int *lenp)
303 const char *names = name_block(&hp->mdesc);
304 u64 last_node = hp->mdesc.node_sz / 16;
305 void *data = data_block(&hp->mdesc);
306 struct mdesc_elem *ep;
308 if (node == MDESC_NODE_NULL || node >= last_node)
311 ep = node_block(&hp->mdesc) + node;
313 for (; ep->tag != MD_NODE_END; ep++) {
325 val = data + ep->d.data.data_offset;
326 len = ep->d.data.data_len;
335 if (!strcmp(names + ep->name_offset, name)) {
344 EXPORT_SYMBOL(mdesc_get_property);
346 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
348 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
349 const char *names = name_block(&hp->mdesc);
350 u64 last_node = hp->mdesc.node_sz / 16;
352 if (from == MDESC_NODE_NULL || from >= last_node)
353 return MDESC_NODE_NULL;
358 for (; ep->tag != MD_NODE_END; ep++) {
359 if (ep->tag != MD_PROP_ARC)
362 if (strcmp(names + ep->name_offset, arc_type))
368 return MDESC_NODE_NULL;
370 EXPORT_SYMBOL(mdesc_next_arc);
372 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
374 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
380 EXPORT_SYMBOL(mdesc_arc_target);
382 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
384 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
385 const char *names = name_block(&hp->mdesc);
386 u64 last_node = hp->mdesc.node_sz / 16;
388 if (node == MDESC_NODE_NULL || node >= last_node)
392 if (ep->tag != MD_NODE)
395 return names + ep->name_offset;
397 EXPORT_SYMBOL(mdesc_node_name);
399 static void __init report_platform_properties(void)
401 struct mdesc_handle *hp = mdesc_grab();
402 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
406 if (pn == MDESC_NODE_NULL) {
407 prom_printf("No platform node in machine-description.\n");
411 s = mdesc_get_property(hp, pn, "banner-name", NULL);
412 printk("PLATFORM: banner-name [%s]\n", s);
413 s = mdesc_get_property(hp, pn, "name", NULL);
414 printk("PLATFORM: name [%s]\n", s);
416 v = mdesc_get_property(hp, pn, "hostid", NULL);
418 printk("PLATFORM: hostid [%08lx]\n", *v);
419 v = mdesc_get_property(hp, pn, "serial#", NULL);
421 printk("PLATFORM: serial# [%08lx]\n", *v);
422 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
423 printk("PLATFORM: stick-frequency [%08lx]\n", *v);
424 v = mdesc_get_property(hp, pn, "mac-address", NULL);
426 printk("PLATFORM: mac-address [%lx]\n", *v);
427 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
429 printk("PLATFORM: watchdog-resolution [%lu ms]\n", *v);
430 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
432 printk("PLATFORM: watchdog-max-timeout [%lu ms]\n", *v);
433 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
435 printk("PLATFORM: max-cpus [%lu]\n", *v);
440 static int inline find_in_proplist(const char *list, const char *match, int len)
445 if (!strcmp(list, match))
447 l = strlen(list) + 1;
454 static void __init fill_in_one_cache(cpuinfo_sparc *c,
455 struct mdesc_handle *hp,
458 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
459 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
460 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
464 type = mdesc_get_property(hp, mp, "type", &type_len);
468 if (find_in_proplist(type, "instn", type_len)) {
469 c->icache_size = *size;
470 c->icache_line_size = *line_size;
471 } else if (find_in_proplist(type, "data", type_len)) {
472 c->dcache_size = *size;
473 c->dcache_line_size = *line_size;
478 c->ecache_size = *size;
479 c->ecache_line_size = *line_size;
489 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
490 u64 target = mdesc_arc_target(hp, a);
491 const char *name = mdesc_node_name(hp, target);
493 if (!strcmp(name, "cache"))
494 fill_in_one_cache(c, hp, target);
499 static void __init mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
503 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
504 u64 t = mdesc_arc_target(hp, a);
508 name = mdesc_node_name(hp, t);
509 if (!strcmp(name, "cpu")) {
510 id = mdesc_get_property(hp, t, "id", NULL);
512 cpu_data(*id).core_id = core_id;
516 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
517 u64 n = mdesc_arc_target(hp, j);
520 n_name = mdesc_node_name(hp, n);
521 if (strcmp(n_name, "cpu"))
524 id = mdesc_get_property(hp, n, "id", NULL);
526 cpu_data(*id).core_id = core_id;
532 static void __init set_core_ids(struct mdesc_handle *hp)
538 mdesc_for_each_node_by_name(hp, mp, "cache") {
543 level = mdesc_get_property(hp, mp, "level", NULL);
547 type = mdesc_get_property(hp, mp, "type", &len);
548 if (!find_in_proplist(type, "instn", len))
551 mark_core_ids(hp, mp, idx);
557 static void __init mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
561 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
562 u64 t = mdesc_arc_target(hp, a);
566 name = mdesc_node_name(hp, t);
567 if (strcmp(name, "cpu"))
570 id = mdesc_get_property(hp, t, "id", NULL);
572 cpu_data(*id).proc_id = proc_id;
576 static void __init __set_proc_ids(struct mdesc_handle *hp,
577 const char *exec_unit_name)
583 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
587 type = mdesc_get_property(hp, mp, "type", &len);
588 if (!find_in_proplist(type, "int", len) &&
589 !find_in_proplist(type, "integer", len))
592 mark_proc_ids(hp, mp, idx);
598 static void __init set_proc_ids(struct mdesc_handle *hp)
600 __set_proc_ids(hp, "exec_unit");
601 __set_proc_ids(hp, "exec-unit");
604 static void __init get_one_mondo_bits(const u64 *p, unsigned int *mask, unsigned char def)
612 if (!val || val >= 64)
615 *mask = ((1U << val) * 64U) - 1U;
619 *mask = ((1U << def) * 64U) - 1U;
622 static void __init get_mondo_data(struct mdesc_handle *hp, u64 mp,
623 struct trap_per_cpu *tb)
627 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
628 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
630 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
631 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
633 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
634 get_one_mondo_bits(val, &tb->resum_qmask, 6);
636 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
637 get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
640 static void __init mdesc_fill_in_cpu_data(void)
642 struct mdesc_handle *hp = mdesc_grab();
646 mdesc_for_each_node_by_name(hp, mp, "cpu") {
647 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
648 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
649 struct trap_per_cpu *tb;
659 if (cpuid >= NR_CPUS)
662 /* On uniprocessor we only want the values for the
663 * real physical cpu the kernel booted onto, however
664 * cpu_data() only has one entry at index 0.
666 if (cpuid != real_hard_smp_processor_id())
671 c = &cpu_data(cpuid);
672 c->clock_tick = *cfreq;
674 tb = &trap_block[cpuid];
675 get_mondo_data(hp, mp, tb);
677 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
678 u64 j, t = mdesc_arc_target(hp, a);
681 t_name = mdesc_node_name(hp, t);
682 if (!strcmp(t_name, "cache")) {
683 fill_in_one_cache(c, hp, t);
687 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
688 u64 n = mdesc_arc_target(hp, j);
691 n_name = mdesc_node_name(hp, n);
692 if (!strcmp(n_name, "cache"))
693 fill_in_one_cache(c, hp, n);
698 cpu_set(cpuid, cpu_present_map);
699 cpu_set(cpuid, phys_cpu_present_map);
707 sparc64_multi_core = 1;
713 smp_fill_in_sib_core_maps();
718 void __init sun4v_mdesc_init(void)
720 struct mdesc_handle *hp;
721 unsigned long len, real_len, status;
723 (void) sun4v_mach_desc(0UL, 0UL, &len);
725 printk("MDESC: Size is %lu bytes.\n", len);
727 hp = mdesc_alloc(len, &bootmem_mdesc_memops);
729 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
733 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
734 if (status != HV_EOK || real_len > len) {
735 prom_printf("sun4v_mach_desc fails, err(%lu), "
736 "len(%lu), real_len(%lu)\n",
737 status, len, real_len);
744 report_platform_properties();
745 mdesc_fill_in_cpu_data();