[SPARC64]: Use machine description and OBP properly for cpu probing.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 619 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/mdesc.c b/arch/sparc64/kernel/mdesc.c
new file mode 100644
index 000000000000..9246c2cf9574
--- /dev/null
+++ b/arch/sparc64/kernel/mdesc.c
@@ -0,0 +1,619 @@
+/* mdesc.c: Sun4V machine description handling.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/log2.h>
+
+#include <asm/hypervisor.h>
+#include <asm/mdesc.h>
+#include <asm/prom.h>
+#include <asm/oplib.h>
+#include <asm/smp.h>
+
+/* Unlike the OBP device tree, the machine description is a full-on
+ * DAG.  An arbitrary number of ARCs are possible from one
+ * node to other nodes and thus we can't use the OBP device_node
+ * data structure to represent these nodes inside of the kernel.
+ *
+ * Actually, it isn't even a DAG, because there are back pointers
+ * which create cycles in the graph.
+ *
+ * mdesc_hdr and mdesc_elem describe the layout of the data structure
+ * we get from the Hypervisor.
+ */
+struct mdesc_hdr {
+	u32	version; /* Transport version */
+	u32	node_sz; /* node block size */
+	u32	name_sz; /* name block size */
+	u32	data_sz; /* data block size */
+};
+
+struct mdesc_elem {
+	u8	tag;
+#define MD_LIST_END	0x00
+#define MD_NODE		0x4e
+#define MD_NODE_END	0x45
+#define MD_NOOP		0x20
+#define MD_PROP_ARC	0x61
+#define MD_PROP_VAL	0x76
+#define MD_PROP_STR	0x73
+#define MD_PROP_DATA	0x64
+	u8	name_len;
+	u16	resv;
+	u32	name_offset;
+	union {
+		struct {
+			u32	data_len;
+			u32	data_offset;
+		} data;
+		u64	val;
+	} d;
+};
+
+static struct mdesc_hdr *main_mdesc;
+static struct mdesc_node *allnodes;
+
+static struct mdesc_node *allnodes_tail;
+static unsigned int unique_id;
+
+static struct mdesc_node **mdesc_hash;
+static unsigned int mdesc_hash_size;
+
+static inline unsigned int node_hashfn(u64 node)
+{
+	return ((unsigned int) (node ^ (node >> 8) ^ (node >> 16)))
+		& (mdesc_hash_size - 1);
+}
+
+static inline void hash_node(struct mdesc_node *mp)
+{
+	struct mdesc_node **head = &mdesc_hash[node_hashfn(mp->node)];
+
+	mp->hash_next = *head;
+	*head = mp;
+
+	if (allnodes_tail) {
+		allnodes_tail->allnodes_next = mp;
+		allnodes_tail = mp;
+	} else {
+		allnodes = allnodes_tail = mp;
+	}
+}
+
+static struct mdesc_node *find_node(u64 node)
+{
+	struct mdesc_node *mp = mdesc_hash[node_hashfn(node)];
+
+	while (mp) {
+		if (mp->node == node)
+			return mp;
+
+		mp = mp->hash_next;
+	}
+	return NULL;
+}
+
+struct property *md_find_property(const struct mdesc_node *mp,
+				  const char *name,
+				  int *lenp)
+{
+	struct property *pp;
+
+	for (pp = mp->properties; pp != 0; pp = pp->next) {
+		if (strcasecmp(pp->name, name) == 0) {
+			if (lenp)
+				*lenp = pp->length;
+			break;
+		}
+	}
+	return pp;
+}
+EXPORT_SYMBOL(md_find_property);
+
+/*
+ * Find a property with a given name for a given node
+ * and return the value.
+ */
+const void *md_get_property(const struct mdesc_node *mp, const char *name,
+			    int *lenp)
+{
+	struct property *pp = md_find_property(mp, name, lenp);
+	return pp ? pp->value : NULL;
+}
+EXPORT_SYMBOL(md_get_property);
+
+struct mdesc_node *md_find_node_by_name(struct mdesc_node *from,
+					const char *name)
+{
+	struct mdesc_node *mp;
+
+	mp = from ? from->allnodes_next : allnodes;
+	for (; mp != NULL; mp = mp->allnodes_next) {
+		if (strcmp(mp->name, name) == 0)
+			break;
+	}
+	return mp;
+}
+EXPORT_SYMBOL(md_find_node_by_name);
+
+static unsigned int mdesc_early_allocated;
+
+static void * __init mdesc_early_alloc(unsigned long size)
+{
+	void *ret;
+
+	ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
+	if (ret == NULL) {
+		prom_printf("MDESC: alloc of %lu bytes failed.\n", size);
+		prom_halt();
+	}
+
+	memset(ret, 0, size);
+
+	mdesc_early_allocated += size;
+
+	return ret;
+}
+
+static unsigned int __init count_arcs(struct mdesc_elem *ep)
+{
+	unsigned int ret = 0;
+
+	ep++;
+	while (ep->tag != MD_NODE_END) {
+		if (ep->tag == MD_PROP_ARC)
+			ret++;
+		ep++;
+	}
+	return ret;
+}
+
+static void __init mdesc_node_alloc(u64 node, struct mdesc_elem *ep, const char *names)
+{
+	unsigned int num_arcs = count_arcs(ep);
+	struct mdesc_node *mp;
+
+	mp = mdesc_early_alloc(sizeof(*mp) +
+			       (num_arcs * sizeof(struct mdesc_arc)));
+	mp->name = names + ep->name_offset;
+	mp->node = node;
+	mp->unique_id = unique_id++;
+	mp->num_arcs = num_arcs;
+
+	hash_node(mp);
+}
+
+static inline struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
+{
+	return (struct mdesc_elem *) (mdesc + 1);
+}
+
+static inline void *name_block(struct mdesc_hdr *mdesc)
+{
+	return ((void *) node_block(mdesc)) + mdesc->node_sz;
+}
+
+static inline void *data_block(struct mdesc_hdr *mdesc)
+{
+	return ((void *) name_block(mdesc)) + mdesc->name_sz;
+}
+
+/* In order to avoid recursion (the graph can be very deep) we use a
+ * two pass algorithm.  First we allocate all the nodes and hash them.
+ * Then we iterate over each node, filling in the arcs and properties.
+ */
+static void __init build_all_nodes(struct mdesc_hdr *mdesc)
+{
+	struct mdesc_elem *start, *ep;
+	struct mdesc_node *mp;
+	const char *names;
+	void *data;
+	u64 last_node;
+
+	start = ep = node_block(mdesc);
+	last_node = mdesc->node_sz / 16;
+
+	names = name_block(mdesc);
+
+	while (1) {
+		u64 node = ep - start;
+
+		if (ep->tag == MD_LIST_END)
+			break;
+
+		if (ep->tag != MD_NODE) {
+			prom_printf("MDESC: Inconsistent element list.\n");
+			prom_halt();
+		}
+
+		mdesc_node_alloc(node, ep, names);
+
+		if (ep->d.val >= last_node) {
+			printk("MDESC: Warning, early break out of node scan.\n");
+			printk("MDESC: Next node [%lu] last_node [%lu].\n",
+			       node, last_node);
+			break;
+		}
+
+		ep = start + ep->d.val;
+	}
+
+	data = data_block(mdesc);
+	for (mp = allnodes; mp; mp = mp->allnodes_next) {
+		struct mdesc_elem *ep = start + mp->node;
+		struct property **link = &mp->properties;
+		unsigned int this_arc = 0;
+
+		ep++;
+		while (ep->tag != MD_NODE_END) {
+			switch (ep->tag) {
+			case MD_PROP_ARC: {
+				struct mdesc_node *target;
+
+				if (this_arc >= mp->num_arcs) {
+					prom_printf("MDESC: ARC overrun [%u:%u]\n",
+						    this_arc, mp->num_arcs);
+					prom_halt();
+				}
+				target = find_node(ep->d.val);
+				if (!target) {
+					printk("MDESC: Warning, arc points to "
+					       "missing node, ignoring.\n");
+					break;
+				}
+				mp->arcs[this_arc].name =
+					(names + ep->name_offset);
+				mp->arcs[this_arc].arc = target;
+				this_arc++;
+				break;
+			}
+
+			case MD_PROP_VAL:
+			case MD_PROP_STR:
+			case MD_PROP_DATA: {
+				struct property *p = mdesc_early_alloc(sizeof(*p));
+
+				p->unique_id = unique_id++;
+				p->name = (char *) names + ep->name_offset;
+				if (ep->tag == MD_PROP_VAL) {
+					p->value = &ep->d.val;
+					p->length = 8;
+				} else {
+					p->value = data + ep->d.data.data_offset;
+					p->length = ep->d.data.data_len;
+				}
+				*link = p;
+				link = &p->next;
+				break;
+			}
+
+			case MD_NOOP:
+				break;
+
+			default:
+				printk("MDESC: Warning, ignoring unknown tag type %02x\n",
+				       ep->tag);
+			}
+			ep++;
+		}
+	}
+}
+
+static unsigned int __init count_nodes(struct mdesc_hdr *mdesc)
+{
+	struct mdesc_elem *ep = node_block(mdesc);
+	struct mdesc_elem *end;
+	unsigned int cnt = 0;
+
+	end = ((void *)ep) + mdesc->node_sz;
+	while (ep < end) {
+		if (ep->tag == MD_NODE)
+			cnt++;
+		ep++;
+	}
+	return cnt;
+}
+
+static void __init report_platform_properties(void)
+{
+	struct mdesc_node *pn = md_find_node_by_name(NULL, "platform");
+	const char *s;
+	const u64 *v;
+
+	if (!pn) {
+		prom_printf("No platform node in machine-description.\n");
+		prom_halt();
+	}
+
+	s = md_get_property(pn, "banner-name", NULL);
+	printk("PLATFORM: banner-name [%s]\n", s);
+	s = md_get_property(pn, "name", NULL);
+	printk("PLATFORM: name [%s]\n", s);
+
+	v = md_get_property(pn, "hostid", NULL);
+	if (v)
+		printk("PLATFORM: hostid [%08lx]\n", *v);
+	v = md_get_property(pn, "serial#", NULL);
+	if (v)
+		printk("PLATFORM: serial# [%08lx]\n", *v);
+	v = md_get_property(pn, "stick-frequency", NULL);
+	printk("PLATFORM: stick-frequency [%08lx]\n", *v);
+	v = md_get_property(pn, "mac-address", NULL);
+	if (v)
+		printk("PLATFORM: mac-address [%lx]\n", *v);
+	v = md_get_property(pn, "watchdog-resolution", NULL);
+	if (v)
+		printk("PLATFORM: watchdog-resolution [%lu ms]\n", *v);
+	v = md_get_property(pn, "watchdog-max-timeout", NULL);
+	if (v)
+		printk("PLATFORM: watchdog-max-timeout [%lu ms]\n", *v);
+	v = md_get_property(pn, "max-cpus", NULL);
+	if (v)
+		printk("PLATFORM: max-cpus [%lu]\n", *v);
+}
+
+static int inline find_in_proplist(const char *list, const char *match, int len)
+{
+	while (len > 0) {
+		int l;
+
+		if (!strcmp(list, match))
+			return 1;
+		l = strlen(list) + 1;
+		list += l;
+		len -= l;
+	}
+	return 0;
+}
+
+static void __init fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_node *mp)
+{
+	const u64 *level = md_get_property(mp, "level", NULL);
+	const u64 *size = md_get_property(mp, "size", NULL);
+	const u64 *line_size = md_get_property(mp, "line-size", NULL);
+	const char *type;
+	int type_len;
+
+	type = md_get_property(mp, "type", &type_len);
+
+	switch (*level) {
+	case 1:
+		if (find_in_proplist(type, "instn", type_len)) {
+			c->icache_size = *size;
+			c->icache_line_size = *line_size;
+		} else if (find_in_proplist(type, "data", type_len)) {
+			c->dcache_size = *size;
+			c->dcache_line_size = *line_size;
+		}
+		break;
+
+	case 2:
+		c->ecache_size = *size;
+		c->ecache_line_size = *line_size;
+		break;
+
+	default:
+		break;
+	}
+
+	if (*level == 1) {
+		unsigned int i;
+
+		for (i = 0; i < mp->num_arcs; i++) {
+			struct mdesc_node *t = mp->arcs[i].arc;
+
+			if (strcmp(mp->arcs[i].name, "fwd"))
+				continue;
+
+			if (!strcmp(t->name, "cache"))
+				fill_in_one_cache(c, t);
+		}
+	}
+}
+
+static void __init mark_core_ids(struct mdesc_node *mp, int core_id)
+{
+	unsigned int i;
+
+	for (i = 0; i < mp->num_arcs; i++) {
+		struct mdesc_node *t = mp->arcs[i].arc;
+		const u64 *id;
+
+		if (strcmp(mp->arcs[i].name, "back"))
+			continue;
+
+		if (!strcmp(t->name, "cpu")) {
+			id = md_get_property(t, "id", NULL);
+			if (*id < NR_CPUS)
+				cpu_data(*id).core_id = core_id;
+		} else {
+			unsigned int j;
+
+			for (j = 0; j < t->num_arcs; j++) {
+				struct mdesc_node *n = t->arcs[j].arc;
+
+				if (strcmp(t->arcs[j].name, "back"))
+					continue;
+
+				if (strcmp(n->name, "cpu"))
+					continue;
+
+				id = md_get_property(n, "id", NULL);
+				if (*id < NR_CPUS)
+					cpu_data(*id).core_id = core_id;
+			}
+		}
+	}
+}
+
+static void __init set_core_ids(void)
+{
+	struct mdesc_node *mp;
+	int idx;
+
+	idx = 1;
+	md_for_each_node_by_name(mp, "cache") {
+		const u64 *level = md_get_property(mp, "level", NULL);
+		const char *type;
+		int len;
+
+		if (*level != 1)
+			continue;
+
+		type = md_get_property(mp, "type", &len);
+		if (!find_in_proplist(type, "instn", len))
+			continue;
+
+		mark_core_ids(mp, idx);
+
+		idx++;
+	}
+}
+
+static void __init get_one_mondo_bits(const u64 *p, unsigned int *mask, unsigned char def)
+{
+	u64 val;
+
+	if (!p)
+		goto use_default;
+	val = *p;
+
+	if (!val || val >= 64)
+		goto use_default;
+
+	*mask = ((1U << val) * 64U) - 1U;
+	return;
+
+use_default:
+	*mask = ((1U << def) * 64U) - 1U;
+}
+
+static void __init get_mondo_data(struct mdesc_node *mp, struct trap_per_cpu *tb)
+{
+	const u64 *val;
+
+	val = md_get_property(mp, "q-cpu-mondo-#bits", NULL);
+	get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
+
+	val = md_get_property(mp, "q-dev-mondo-#bits", NULL);
+	get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
+
+	val = md_get_property(mp, "q-resumable-#bits", NULL);
+	get_one_mondo_bits(val, &tb->resum_qmask, 6);
+
+	val = md_get_property(mp, "q-nonresumable-#bits", NULL);
+	get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
+}
+
+static void __init mdesc_fill_in_cpu_data(void)
+{
+	struct mdesc_node *mp;
+
+	ncpus_probed = 0;
+	md_for_each_node_by_name(mp, "cpu") {
+		const u64 *id = md_get_property(mp, "id", NULL);
+		const u64 *cfreq = md_get_property(mp, "clock-frequency", NULL);
+		struct trap_per_cpu *tb;
+		cpuinfo_sparc *c;
+		unsigned int i;
+		int cpuid;
+
+		ncpus_probed++;
+
+		cpuid = *id;
+
+#ifdef CONFIG_SMP
+		if (cpuid >= NR_CPUS)
+			continue;
+#else
+		/* On uniprocessor we only want the values for the
+		 * real physical cpu the kernel booted onto, however
+		 * cpu_data() only has one entry at index 0.
+		 */
+		if (cpuid != real_hard_smp_processor_id())
+			continue;
+		cpuid = 0;
+#endif
+
+		c = &cpu_data(cpuid);
+		c->clock_tick = *cfreq;
+
+		tb = &trap_block[cpuid];
+		get_mondo_data(mp, tb);
+
+		for (i = 0; i < mp->num_arcs; i++) {
+			struct mdesc_node *t = mp->arcs[i].arc;
+			unsigned int j;
+
+			if (strcmp(mp->arcs[i].name, "fwd"))
+				continue;
+
+			if (!strcmp(t->name, "cache")) {
+				fill_in_one_cache(c, t);
+				continue;
+			}
+
+			for (j = 0; j < t->num_arcs; j++) {
+				struct mdesc_node *n;
+
+				n = t->arcs[j].arc;
+				if (strcmp(t->arcs[j].name, "fwd"))
+					continue;
+
+				if (!strcmp(n->name, "cache"))
+					fill_in_one_cache(c, n);
+			}
+		}
+
+#ifdef CONFIG_SMP
+		cpu_set(cpuid, cpu_present_map);
+		cpu_set(cpuid, phys_cpu_present_map);
+#endif
+
+		c->core_id = 0;
+	}
+
+	set_core_ids();
+
+	smp_fill_in_sib_core_maps();
+}
+
+void __init sun4v_mdesc_init(void)
+{
+	unsigned long len, real_len, status;
+
+	(void) sun4v_mach_desc(0UL, 0UL, &len);
+
+	printk("MDESC: Size is %lu bytes.\n", len);
+
+	main_mdesc = mdesc_early_alloc(len);
+
+	status = sun4v_mach_desc(__pa(main_mdesc), len, &real_len);
+	if (status != HV_EOK || real_len > len) {
+		prom_printf("sun4v_mach_desc fails, err(%lu), "
+			    "len(%lu), real_len(%lu)\n",
+			    status, len, real_len);
+		prom_halt();
+	}
+
+	len = count_nodes(main_mdesc);
+	printk("MDESC: %lu nodes.\n", len);
+
+	len = roundup_pow_of_two(len);
+
+	mdesc_hash = mdesc_early_alloc(len * sizeof(struct mdesc_node *));
+	mdesc_hash_size = len;
+
+	printk("MDESC: Hash size %lu entries.\n", len);
+
+	build_all_nodes(main_mdesc);
+
+	printk("MDESC: Built graph with %u bytes of memory.\n",
+	       mdesc_early_allocated);
+
+	report_platform_properties();
+	mdesc_fill_in_cpu_data();
+}