v4.19.13 snapshot.
diff --git a/arch/sparc/kernel/mdesc.c b/arch/sparc/kernel/mdesc.c
new file mode 100644
index 0000000..39a2503
--- /dev/null
+++ b/arch/sparc/kernel/mdesc.c
@@ -0,0 +1,1351 @@
+// SPDX-License-Identifier: GPL-2.0
+/* mdesc.c: Sun4V machine description handling.
+ *
+ * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/memblock.h>
+#include <linux/log2.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/bootmem.h>
+#include <linux/export.h>
+#include <linux/refcount.h>
+
+#include <asm/cpudata.h>
+#include <asm/hypervisor.h>
+#include <asm/mdesc.h>
+#include <asm/prom.h>
+#include <linux/uaccess.h>
+#include <asm/oplib.h>
+#include <asm/smp.h>
+#include <asm/adi.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 */
+} __attribute__((aligned(16)));
+
+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;
+};
+
+struct mdesc_mem_ops {
+ struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
+ void (*free)(struct mdesc_handle *handle);
+};
+
+struct mdesc_handle {
+ struct list_head list;
+ struct mdesc_mem_ops *mops;
+ void *self_base;
+ refcount_t refcnt;
+ unsigned int handle_size;
+ struct mdesc_hdr mdesc;
+};
+
+typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
+ union md_node_info *);
+typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
+typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
+
+struct md_node_ops {
+ char *name;
+ mdesc_node_info_get_f get_info;
+ mdesc_node_info_rel_f rel_info;
+ mdesc_node_match_f node_match;
+};
+
+static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
+ union md_node_info *node_info);
+static void rel_vdev_port_node_info(union md_node_info *node_info);
+static bool vdev_port_node_match(union md_node_info *a_node_info,
+ union md_node_info *b_node_info);
+
+static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
+ union md_node_info *node_info);
+static void rel_ds_port_node_info(union md_node_info *node_info);
+static bool ds_port_node_match(union md_node_info *a_node_info,
+ union md_node_info *b_node_info);
+
+/* supported node types which can be registered */
+static struct md_node_ops md_node_ops_table[] = {
+ {"virtual-device-port", get_vdev_port_node_info,
+ rel_vdev_port_node_info, vdev_port_node_match},
+ {"domain-services-port", get_ds_port_node_info,
+ rel_ds_port_node_info, ds_port_node_match},
+ {NULL, NULL, NULL, NULL}
+};
+
+static void mdesc_get_node_ops(const char *node_name,
+ mdesc_node_info_get_f *get_info_f,
+ mdesc_node_info_rel_f *rel_info_f,
+ mdesc_node_match_f *match_f)
+{
+ int i;
+
+ if (get_info_f)
+ *get_info_f = NULL;
+
+ if (rel_info_f)
+ *rel_info_f = NULL;
+
+ if (match_f)
+ *match_f = NULL;
+
+ if (!node_name)
+ return;
+
+ for (i = 0; md_node_ops_table[i].name != NULL; i++) {
+ if (strcmp(md_node_ops_table[i].name, node_name) == 0) {
+ if (get_info_f)
+ *get_info_f = md_node_ops_table[i].get_info;
+
+ if (rel_info_f)
+ *rel_info_f = md_node_ops_table[i].rel_info;
+
+ if (match_f)
+ *match_f = md_node_ops_table[i].node_match;
+
+ break;
+ }
+ }
+}
+
+static void mdesc_handle_init(struct mdesc_handle *hp,
+ unsigned int handle_size,
+ void *base)
+{
+ BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
+
+ memset(hp, 0, handle_size);
+ INIT_LIST_HEAD(&hp->list);
+ hp->self_base = base;
+ refcount_set(&hp->refcnt, 1);
+ hp->handle_size = handle_size;
+}
+
+static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
+{
+ unsigned int handle_size, alloc_size;
+ struct mdesc_handle *hp;
+ unsigned long paddr;
+
+ handle_size = (sizeof(struct mdesc_handle) -
+ sizeof(struct mdesc_hdr) +
+ mdesc_size);
+ alloc_size = PAGE_ALIGN(handle_size);
+
+ paddr = memblock_alloc(alloc_size, PAGE_SIZE);
+
+ hp = NULL;
+ if (paddr) {
+ hp = __va(paddr);
+ mdesc_handle_init(hp, handle_size, hp);
+ }
+ return hp;
+}
+
+static void __init mdesc_memblock_free(struct mdesc_handle *hp)
+{
+ unsigned int alloc_size;
+ unsigned long start;
+
+ BUG_ON(refcount_read(&hp->refcnt) != 0);
+ BUG_ON(!list_empty(&hp->list));
+
+ alloc_size = PAGE_ALIGN(hp->handle_size);
+ start = __pa(hp);
+ free_bootmem_late(start, alloc_size);
+}
+
+static struct mdesc_mem_ops memblock_mdesc_ops = {
+ .alloc = mdesc_memblock_alloc,
+ .free = mdesc_memblock_free,
+};
+
+static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
+{
+ unsigned int handle_size;
+ struct mdesc_handle *hp;
+ unsigned long addr;
+ void *base;
+
+ handle_size = (sizeof(struct mdesc_handle) -
+ sizeof(struct mdesc_hdr) +
+ mdesc_size);
+ base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
+ if (!base)
+ return NULL;
+
+ addr = (unsigned long)base;
+ addr = (addr + 15UL) & ~15UL;
+ hp = (struct mdesc_handle *) addr;
+
+ mdesc_handle_init(hp, handle_size, base);
+
+ return hp;
+}
+
+static void mdesc_kfree(struct mdesc_handle *hp)
+{
+ BUG_ON(refcount_read(&hp->refcnt) != 0);
+ BUG_ON(!list_empty(&hp->list));
+
+ kfree(hp->self_base);
+}
+
+static struct mdesc_mem_ops kmalloc_mdesc_memops = {
+ .alloc = mdesc_kmalloc,
+ .free = mdesc_kfree,
+};
+
+static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
+ struct mdesc_mem_ops *mops)
+{
+ struct mdesc_handle *hp = mops->alloc(mdesc_size);
+
+ if (hp)
+ hp->mops = mops;
+
+ return hp;
+}
+
+static void mdesc_free(struct mdesc_handle *hp)
+{
+ hp->mops->free(hp);
+}
+
+static struct mdesc_handle *cur_mdesc;
+static LIST_HEAD(mdesc_zombie_list);
+static DEFINE_SPINLOCK(mdesc_lock);
+
+struct mdesc_handle *mdesc_grab(void)
+{
+ struct mdesc_handle *hp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&mdesc_lock, flags);
+ hp = cur_mdesc;
+ if (hp)
+ refcount_inc(&hp->refcnt);
+ spin_unlock_irqrestore(&mdesc_lock, flags);
+
+ return hp;
+}
+EXPORT_SYMBOL(mdesc_grab);
+
+void mdesc_release(struct mdesc_handle *hp)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mdesc_lock, flags);
+ if (refcount_dec_and_test(&hp->refcnt)) {
+ list_del_init(&hp->list);
+ hp->mops->free(hp);
+ }
+ spin_unlock_irqrestore(&mdesc_lock, flags);
+}
+EXPORT_SYMBOL(mdesc_release);
+
+static DEFINE_MUTEX(mdesc_mutex);
+static struct mdesc_notifier_client *client_list;
+
+void mdesc_register_notifier(struct mdesc_notifier_client *client)
+{
+ bool supported = false;
+ u64 node;
+ int i;
+
+ mutex_lock(&mdesc_mutex);
+
+ /* check to see if the node is supported for registration */
+ for (i = 0; md_node_ops_table[i].name != NULL; i++) {
+ if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) {
+ supported = true;
+ break;
+ }
+ }
+
+ if (!supported) {
+ pr_err("MD: %s node not supported\n", client->node_name);
+ mutex_unlock(&mdesc_mutex);
+ return;
+ }
+
+ client->next = client_list;
+ client_list = client;
+
+ mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
+ client->add(cur_mdesc, node, client->node_name);
+
+ mutex_unlock(&mdesc_mutex);
+}
+
+static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
+{
+ const u64 *id;
+ u64 a;
+
+ id = NULL;
+ mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
+ u64 target;
+
+ target = mdesc_arc_target(hp, a);
+ id = mdesc_get_property(hp, target,
+ "cfg-handle", NULL);
+ if (id)
+ break;
+ }
+
+ return id;
+}
+
+static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
+ union md_node_info *node_info)
+{
+ const u64 *parent_cfg_hdlp;
+ const char *name;
+ const u64 *idp;
+
+ /*
+ * Virtual device nodes are distinguished by:
+ * 1. "id" property
+ * 2. "name" property
+ * 3. parent node "cfg-handle" property
+ */
+ idp = mdesc_get_property(md, node, "id", NULL);
+ name = mdesc_get_property(md, node, "name", NULL);
+ parent_cfg_hdlp = parent_cfg_handle(md, node);
+
+ if (!idp || !name || !parent_cfg_hdlp)
+ return -1;
+
+ node_info->vdev_port.id = *idp;
+ node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);
+ node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;
+
+ return 0;
+}
+
+static void rel_vdev_port_node_info(union md_node_info *node_info)
+{
+ if (node_info && node_info->vdev_port.name) {
+ kfree_const(node_info->vdev_port.name);
+ node_info->vdev_port.name = NULL;
+ }
+}
+
+static bool vdev_port_node_match(union md_node_info *a_node_info,
+ union md_node_info *b_node_info)
+{
+ if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)
+ return false;
+
+ if (a_node_info->vdev_port.parent_cfg_hdl !=
+ b_node_info->vdev_port.parent_cfg_hdl)
+ return false;
+
+ if (strncmp(a_node_info->vdev_port.name,
+ b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)
+ return false;
+
+ return true;
+}
+
+static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
+ union md_node_info *node_info)
+{
+ const u64 *idp;
+
+ /* DS port nodes use the "id" property to distinguish them */
+ idp = mdesc_get_property(md, node, "id", NULL);
+ if (!idp)
+ return -1;
+
+ node_info->ds_port.id = *idp;
+
+ return 0;
+}
+
+static void rel_ds_port_node_info(union md_node_info *node_info)
+{
+}
+
+static bool ds_port_node_match(union md_node_info *a_node_info,
+ union md_node_info *b_node_info)
+{
+ if (a_node_info->ds_port.id != b_node_info->ds_port.id)
+ return false;
+
+ return true;
+}
+
+/* Run 'func' on nodes which are in A but not in B. */
+static void invoke_on_missing(const char *name,
+ struct mdesc_handle *a,
+ struct mdesc_handle *b,
+ void (*func)(struct mdesc_handle *, u64,
+ const char *node_name))
+{
+ mdesc_node_info_get_f get_info_func;
+ mdesc_node_info_rel_f rel_info_func;
+ mdesc_node_match_f node_match_func;
+ union md_node_info a_node_info;
+ union md_node_info b_node_info;
+ bool found;
+ u64 a_node;
+ u64 b_node;
+ int rv;
+
+ /*
+ * Find the get_info, rel_info and node_match ops for the given
+ * node name
+ */
+ mdesc_get_node_ops(name, &get_info_func, &rel_info_func,
+ &node_match_func);
+
+ /* If we didn't find a match, the node type is not supported */
+ if (!get_info_func || !rel_info_func || !node_match_func) {
+ pr_err("MD: %s node type is not supported\n", name);
+ return;
+ }
+
+ mdesc_for_each_node_by_name(a, a_node, name) {
+ found = false;
+
+ rv = get_info_func(a, a_node, &a_node_info);
+ if (rv != 0) {
+ pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
+ name);
+ continue;
+ }
+
+ /* Check each node in B for node matching a_node */
+ mdesc_for_each_node_by_name(b, b_node, name) {
+ rv = get_info_func(b, b_node, &b_node_info);
+ if (rv != 0)
+ continue;
+
+ if (node_match_func(&a_node_info, &b_node_info)) {
+ found = true;
+ rel_info_func(&b_node_info);
+ break;
+ }
+
+ rel_info_func(&b_node_info);
+ }
+
+ rel_info_func(&a_node_info);
+
+ if (!found)
+ func(a, a_node, name);
+ }
+}
+
+static void notify_one(struct mdesc_notifier_client *p,
+ struct mdesc_handle *old_hp,
+ struct mdesc_handle *new_hp)
+{
+ invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
+ invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
+}
+
+static void mdesc_notify_clients(struct mdesc_handle *old_hp,
+ struct mdesc_handle *new_hp)
+{
+ struct mdesc_notifier_client *p = client_list;
+
+ while (p) {
+ notify_one(p, old_hp, new_hp);
+ p = p->next;
+ }
+}
+
+void mdesc_update(void)
+{
+ unsigned long len, real_len, status;
+ struct mdesc_handle *hp, *orig_hp;
+ unsigned long flags;
+
+ mutex_lock(&mdesc_mutex);
+
+ (void) sun4v_mach_desc(0UL, 0UL, &len);
+
+ hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
+ if (!hp) {
+ printk(KERN_ERR "MD: mdesc alloc fails\n");
+ goto out;
+ }
+
+ status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
+ if (status != HV_EOK || real_len > len) {
+ printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
+ status);
+ refcount_dec(&hp->refcnt);
+ mdesc_free(hp);
+ goto out;
+ }
+
+ spin_lock_irqsave(&mdesc_lock, flags);
+ orig_hp = cur_mdesc;
+ cur_mdesc = hp;
+ spin_unlock_irqrestore(&mdesc_lock, flags);
+
+ mdesc_notify_clients(orig_hp, hp);
+
+ spin_lock_irqsave(&mdesc_lock, flags);
+ if (refcount_dec_and_test(&orig_hp->refcnt))
+ mdesc_free(orig_hp);
+ else
+ list_add(&orig_hp->list, &mdesc_zombie_list);
+ spin_unlock_irqrestore(&mdesc_lock, flags);
+
+out:
+ mutex_unlock(&mdesc_mutex);
+}
+
+u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
+ union md_node_info *node_info)
+{
+ mdesc_node_info_get_f get_info_func;
+ mdesc_node_info_rel_f rel_info_func;
+ mdesc_node_match_f node_match_func;
+ union md_node_info hp_node_info;
+ u64 hp_node;
+ int rv;
+
+ if (hp == NULL || node_name == NULL || node_info == NULL)
+ return MDESC_NODE_NULL;
+
+ /* Find the ops for the given node name */
+ mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,
+ &node_match_func);
+
+ /* If we didn't find ops for the given node name, it is not supported */
+ if (!get_info_func || !rel_info_func || !node_match_func) {
+ pr_err("MD: %s node is not supported\n", node_name);
+ return -EINVAL;
+ }
+
+ mdesc_for_each_node_by_name(hp, hp_node, node_name) {
+ rv = get_info_func(hp, hp_node, &hp_node_info);
+ if (rv != 0)
+ continue;
+
+ if (node_match_func(node_info, &hp_node_info))
+ break;
+
+ rel_info_func(&hp_node_info);
+ }
+
+ rel_info_func(&hp_node_info);
+
+ return hp_node;
+}
+EXPORT_SYMBOL(mdesc_get_node);
+
+int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
+ const char *node_name, union md_node_info *node_info)
+{
+ mdesc_node_info_get_f get_info_func;
+ int rv;
+
+ if (hp == NULL || node == MDESC_NODE_NULL ||
+ node_name == NULL || node_info == NULL)
+ return -EINVAL;
+
+ /* Find the get_info op for the given node name */
+ mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);
+
+ /* If we didn't find a get_info_func, the node name is not supported */
+ if (get_info_func == NULL) {
+ pr_err("MD: %s node is not supported\n", node_name);
+ return -EINVAL;
+ }
+
+ rv = get_info_func(hp, node, node_info);
+ if (rv != 0) {
+ pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
+ node_name);
+ return -1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mdesc_get_node_info);
+
+static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
+{
+ return (struct mdesc_elem *) (mdesc + 1);
+}
+
+static void *name_block(struct mdesc_hdr *mdesc)
+{
+ return ((void *) node_block(mdesc)) + mdesc->node_sz;
+}
+
+static void *data_block(struct mdesc_hdr *mdesc)
+{
+ return ((void *) name_block(mdesc)) + mdesc->name_sz;
+}
+
+u64 mdesc_node_by_name(struct mdesc_handle *hp,
+ u64 from_node, const char *name)
+{
+ struct mdesc_elem *ep = node_block(&hp->mdesc);
+ const char *names = name_block(&hp->mdesc);
+ u64 last_node = hp->mdesc.node_sz / 16;
+ u64 ret;
+
+ if (from_node == MDESC_NODE_NULL) {
+ ret = from_node = 0;
+ } else if (from_node >= last_node) {
+ return MDESC_NODE_NULL;
+ } else {
+ ret = ep[from_node].d.val;
+ }
+
+ while (ret < last_node) {
+ if (ep[ret].tag != MD_NODE)
+ return MDESC_NODE_NULL;
+ if (!strcmp(names + ep[ret].name_offset, name))
+ break;
+ ret = ep[ret].d.val;
+ }
+ if (ret >= last_node)
+ ret = MDESC_NODE_NULL;
+ return ret;
+}
+EXPORT_SYMBOL(mdesc_node_by_name);
+
+const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
+ const char *name, int *lenp)
+{
+ const char *names = name_block(&hp->mdesc);
+ u64 last_node = hp->mdesc.node_sz / 16;
+ void *data = data_block(&hp->mdesc);
+ struct mdesc_elem *ep;
+
+ if (node == MDESC_NODE_NULL || node >= last_node)
+ return NULL;
+
+ ep = node_block(&hp->mdesc) + node;
+ ep++;
+ for (; ep->tag != MD_NODE_END; ep++) {
+ void *val = NULL;
+ int len = 0;
+
+ switch (ep->tag) {
+ case MD_PROP_VAL:
+ val = &ep->d.val;
+ len = 8;
+ break;
+
+ case MD_PROP_STR:
+ case MD_PROP_DATA:
+ val = data + ep->d.data.data_offset;
+ len = ep->d.data.data_len;
+ break;
+
+ default:
+ break;
+ }
+ if (!val)
+ continue;
+
+ if (!strcmp(names + ep->name_offset, name)) {
+ if (lenp)
+ *lenp = len;
+ return val;
+ }
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(mdesc_get_property);
+
+u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
+{
+ struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
+ const char *names = name_block(&hp->mdesc);
+ u64 last_node = hp->mdesc.node_sz / 16;
+
+ if (from == MDESC_NODE_NULL || from >= last_node)
+ return MDESC_NODE_NULL;
+
+ ep = base + from;
+
+ ep++;
+ for (; ep->tag != MD_NODE_END; ep++) {
+ if (ep->tag != MD_PROP_ARC)
+ continue;
+
+ if (strcmp(names + ep->name_offset, arc_type))
+ continue;
+
+ return ep - base;
+ }
+
+ return MDESC_NODE_NULL;
+}
+EXPORT_SYMBOL(mdesc_next_arc);
+
+u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
+{
+ struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
+
+ ep = base + arc;
+
+ return ep->d.val;
+}
+EXPORT_SYMBOL(mdesc_arc_target);
+
+const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
+{
+ struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
+ const char *names = name_block(&hp->mdesc);
+ u64 last_node = hp->mdesc.node_sz / 16;
+
+ if (node == MDESC_NODE_NULL || node >= last_node)
+ return NULL;
+
+ ep = base + node;
+ if (ep->tag != MD_NODE)
+ return NULL;
+
+ return names + ep->name_offset;
+}
+EXPORT_SYMBOL(mdesc_node_name);
+
+static u64 max_cpus = 64;
+
+static void __init report_platform_properties(void)
+{
+ struct mdesc_handle *hp = mdesc_grab();
+ u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
+ const char *s;
+ const u64 *v;
+
+ if (pn == MDESC_NODE_NULL) {
+ prom_printf("No platform node in machine-description.\n");
+ prom_halt();
+ }
+
+ s = mdesc_get_property(hp, pn, "banner-name", NULL);
+ printk("PLATFORM: banner-name [%s]\n", s);
+ s = mdesc_get_property(hp, pn, "name", NULL);
+ printk("PLATFORM: name [%s]\n", s);
+
+ v = mdesc_get_property(hp, pn, "hostid", NULL);
+ if (v)
+ printk("PLATFORM: hostid [%08llx]\n", *v);
+ v = mdesc_get_property(hp, pn, "serial#", NULL);
+ if (v)
+ printk("PLATFORM: serial# [%08llx]\n", *v);
+ v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
+ printk("PLATFORM: stick-frequency [%08llx]\n", *v);
+ v = mdesc_get_property(hp, pn, "mac-address", NULL);
+ if (v)
+ printk("PLATFORM: mac-address [%llx]\n", *v);
+ v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
+ if (v)
+ printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
+ v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
+ if (v)
+ printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
+ v = mdesc_get_property(hp, pn, "max-cpus", NULL);
+ if (v) {
+ max_cpus = *v;
+ printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
+ }
+
+#ifdef CONFIG_SMP
+ {
+ int max_cpu, i;
+
+ if (v) {
+ max_cpu = *v;
+ if (max_cpu > NR_CPUS)
+ max_cpu = NR_CPUS;
+ } else {
+ max_cpu = NR_CPUS;
+ }
+ for (i = 0; i < max_cpu; i++)
+ set_cpu_possible(i, true);
+ }
+#endif
+
+ mdesc_release(hp);
+}
+
+static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
+{
+ const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
+ const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
+ const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
+ const char *type;
+ int type_len;
+
+ type = mdesc_get_property(hp, mp, "type", &type_len);
+
+ switch (*level) {
+ case 1:
+ if (of_find_in_proplist(type, "instn", type_len)) {
+ c->icache_size = *size;
+ c->icache_line_size = *line_size;
+ } else if (of_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) {
+ u64 a;
+
+ mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
+ u64 target = mdesc_arc_target(hp, a);
+ const char *name = mdesc_node_name(hp, target);
+
+ if (!strcmp(name, "cache"))
+ fill_in_one_cache(c, hp, target);
+ }
+ }
+}
+
+static void find_back_node_value(struct mdesc_handle *hp, u64 node,
+ char *srch_val,
+ void (*func)(struct mdesc_handle *, u64, int),
+ u64 val, int depth)
+{
+ u64 arc;
+
+ /* Since we have an estimate of recursion depth, do a sanity check. */
+ if (depth == 0)
+ return;
+
+ mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
+ u64 n = mdesc_arc_target(hp, arc);
+ const char *name = mdesc_node_name(hp, n);
+
+ if (!strcmp(srch_val, name))
+ (*func)(hp, n, val);
+
+ find_back_node_value(hp, n, srch_val, func, val, depth-1);
+ }
+}
+
+static void __mark_core_id(struct mdesc_handle *hp, u64 node,
+ int core_id)
+{
+ const u64 *id = mdesc_get_property(hp, node, "id", NULL);
+
+ if (*id < num_possible_cpus())
+ cpu_data(*id).core_id = core_id;
+}
+
+static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
+ int max_cache_id)
+{
+ const u64 *id = mdesc_get_property(hp, node, "id", NULL);
+
+ if (*id < num_possible_cpus()) {
+ cpu_data(*id).max_cache_id = max_cache_id;
+
+ /**
+ * On systems without explicit socket descriptions socket
+ * is max_cache_id
+ */
+ cpu_data(*id).sock_id = max_cache_id;
+ }
+}
+
+static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
+ int core_id)
+{
+ find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
+}
+
+static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
+ int max_cache_id)
+{
+ find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
+ max_cache_id, 10);
+}
+
+static void set_core_ids(struct mdesc_handle *hp)
+{
+ int idx;
+ u64 mp;
+
+ idx = 1;
+
+ /* Identify unique cores by looking for cpus backpointed to by
+ * level 1 instruction caches.
+ */
+ mdesc_for_each_node_by_name(hp, mp, "cache") {
+ const u64 *level;
+ const char *type;
+ int len;
+
+ level = mdesc_get_property(hp, mp, "level", NULL);
+ if (*level != 1)
+ continue;
+
+ type = mdesc_get_property(hp, mp, "type", &len);
+ if (!of_find_in_proplist(type, "instn", len))
+ continue;
+
+ mark_core_ids(hp, mp, idx);
+ idx++;
+ }
+}
+
+static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
+{
+ u64 mp;
+ int idx = 1;
+ int fnd = 0;
+
+ /**
+ * Identify unique highest level of shared cache by looking for cpus
+ * backpointed to by shared level N caches.
+ */
+ mdesc_for_each_node_by_name(hp, mp, "cache") {
+ const u64 *cur_lvl;
+
+ cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
+ if (*cur_lvl != level)
+ continue;
+ mark_max_cache_ids(hp, mp, idx);
+ idx++;
+ fnd = 1;
+ }
+ return fnd;
+}
+
+static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
+{
+ int idx = 1;
+
+ mdesc_for_each_node_by_name(hp, mp, "socket") {
+ u64 a;
+
+ mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
+ u64 t = mdesc_arc_target(hp, a);
+ const char *name;
+ const u64 *id;
+
+ name = mdesc_node_name(hp, t);
+ if (strcmp(name, "cpu"))
+ continue;
+
+ id = mdesc_get_property(hp, t, "id", NULL);
+ if (*id < num_possible_cpus())
+ cpu_data(*id).sock_id = idx;
+ }
+ idx++;
+ }
+}
+
+static void set_sock_ids(struct mdesc_handle *hp)
+{
+ u64 mp;
+
+ /**
+ * Find the highest level of shared cache which pre-T7 is also
+ * the socket.
+ */
+ if (!set_max_cache_ids_by_cache(hp, 3))
+ set_max_cache_ids_by_cache(hp, 2);
+
+ /* If machine description exposes sockets data use it.*/
+ mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
+ if (mp != MDESC_NODE_NULL)
+ set_sock_ids_by_socket(hp, mp);
+}
+
+static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
+{
+ u64 a;
+
+ mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
+ u64 t = mdesc_arc_target(hp, a);
+ const char *name;
+ const u64 *id;
+
+ name = mdesc_node_name(hp, t);
+ if (strcmp(name, "cpu"))
+ continue;
+
+ id = mdesc_get_property(hp, t, "id", NULL);
+ if (*id < NR_CPUS)
+ cpu_data(*id).proc_id = proc_id;
+ }
+}
+
+static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
+{
+ int idx;
+ u64 mp;
+
+ idx = 0;
+ mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
+ const char *type;
+ int len;
+
+ type = mdesc_get_property(hp, mp, "type", &len);
+ if (!of_find_in_proplist(type, "int", len) &&
+ !of_find_in_proplist(type, "integer", len))
+ continue;
+
+ mark_proc_ids(hp, mp, idx);
+ idx++;
+ }
+}
+
+static void set_proc_ids(struct mdesc_handle *hp)
+{
+ __set_proc_ids(hp, "exec_unit");
+ __set_proc_ids(hp, "exec-unit");
+}
+
+static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
+ unsigned long def, unsigned long max)
+{
+ u64 val;
+
+ if (!p)
+ goto use_default;
+ val = *p;
+
+ if (!val || val >= 64)
+ goto use_default;
+
+ if (val > max)
+ val = max;
+
+ *mask = ((1U << val) * 64U) - 1U;
+ return;
+
+use_default:
+ *mask = ((1U << def) * 64U) - 1U;
+}
+
+static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
+ struct trap_per_cpu *tb)
+{
+ static int printed;
+ const u64 *val;
+
+ val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
+ get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
+
+ val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
+ get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
+
+ val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
+ get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
+
+ val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
+ get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
+ if (!printed++) {
+ pr_info("SUN4V: Mondo queue sizes "
+ "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
+ tb->cpu_mondo_qmask + 1,
+ tb->dev_mondo_qmask + 1,
+ tb->resum_qmask + 1,
+ tb->nonresum_qmask + 1);
+ }
+}
+
+static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
+{
+ struct mdesc_handle *hp = mdesc_grab();
+ void *ret = NULL;
+ u64 mp;
+
+ mdesc_for_each_node_by_name(hp, mp, "cpu") {
+ const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
+ int cpuid = *id;
+
+#ifdef CONFIG_SMP
+ if (cpuid >= NR_CPUS) {
+ printk(KERN_WARNING "Ignoring CPU %d which is "
+ ">= NR_CPUS (%d)\n",
+ cpuid, NR_CPUS);
+ continue;
+ }
+ if (!cpumask_test_cpu(cpuid, mask))
+ continue;
+#endif
+
+ ret = func(hp, mp, cpuid, arg);
+ if (ret)
+ goto out;
+ }
+out:
+ mdesc_release(hp);
+ return ret;
+}
+
+static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
+ void *arg)
+{
+ ncpus_probed++;
+#ifdef CONFIG_SMP
+ set_cpu_present(cpuid, true);
+#endif
+ return NULL;
+}
+
+void mdesc_populate_present_mask(cpumask_t *mask)
+{
+ if (tlb_type != hypervisor)
+ return;
+
+ ncpus_probed = 0;
+ mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
+}
+
+static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
+{
+ const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
+ unsigned long *pgsz_mask = arg;
+ u64 val;
+
+ val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
+ HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
+ if (pgsz_prop)
+ val = *pgsz_prop;
+
+ if (!*pgsz_mask)
+ *pgsz_mask = val;
+ else
+ *pgsz_mask &= val;
+ return NULL;
+}
+
+void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
+{
+ *pgsz_mask = 0;
+ mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
+}
+
+static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
+ void *arg)
+{
+ const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
+ struct trap_per_cpu *tb;
+ cpuinfo_sparc *c;
+ u64 a;
+
+#ifndef CONFIG_SMP
+ /* 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())
+ return NULL;
+ cpuid = 0;
+#endif
+
+ c = &cpu_data(cpuid);
+ c->clock_tick = *cfreq;
+
+ tb = &trap_block[cpuid];
+ get_mondo_data(hp, mp, tb);
+
+ mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
+ u64 j, t = mdesc_arc_target(hp, a);
+ const char *t_name;
+
+ t_name = mdesc_node_name(hp, t);
+ if (!strcmp(t_name, "cache")) {
+ fill_in_one_cache(c, hp, t);
+ continue;
+ }
+
+ mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
+ u64 n = mdesc_arc_target(hp, j);
+ const char *n_name;
+
+ n_name = mdesc_node_name(hp, n);
+ if (!strcmp(n_name, "cache"))
+ fill_in_one_cache(c, hp, n);
+ }
+ }
+
+ c->core_id = 0;
+ c->proc_id = -1;
+
+ return NULL;
+}
+
+void mdesc_fill_in_cpu_data(cpumask_t *mask)
+{
+ struct mdesc_handle *hp;
+
+ mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
+
+ hp = mdesc_grab();
+
+ set_core_ids(hp);
+ set_proc_ids(hp);
+ set_sock_ids(hp);
+
+ mdesc_release(hp);
+
+ smp_fill_in_sib_core_maps();
+}
+
+/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
+ * opened. Hold this reference until /dev/mdesc is closed to ensure
+ * mdesc data structure is not released underneath us. Store the
+ * pointer to mdesc structure in private_data for read and seek to use
+ */
+static int mdesc_open(struct inode *inode, struct file *file)
+{
+ struct mdesc_handle *hp = mdesc_grab();
+
+ if (!hp)
+ return -ENODEV;
+
+ file->private_data = hp;
+
+ return 0;
+}
+
+static ssize_t mdesc_read(struct file *file, char __user *buf,
+ size_t len, loff_t *offp)
+{
+ struct mdesc_handle *hp = file->private_data;
+ unsigned char *mdesc;
+ int bytes_left, count = len;
+
+ if (*offp >= hp->handle_size)
+ return 0;
+
+ bytes_left = hp->handle_size - *offp;
+ if (count > bytes_left)
+ count = bytes_left;
+
+ mdesc = (unsigned char *)&hp->mdesc;
+ mdesc += *offp;
+ if (!copy_to_user(buf, mdesc, count)) {
+ *offp += count;
+ return count;
+ } else {
+ return -EFAULT;
+ }
+}
+
+static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
+{
+ struct mdesc_handle *hp = file->private_data;
+
+ return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
+}
+
+/* mdesc_close() - /dev/mdesc is being closed, release the reference to
+ * mdesc structure.
+ */
+static int mdesc_close(struct inode *inode, struct file *file)
+{
+ mdesc_release(file->private_data);
+ return 0;
+}
+
+static const struct file_operations mdesc_fops = {
+ .open = mdesc_open,
+ .read = mdesc_read,
+ .llseek = mdesc_llseek,
+ .release = mdesc_close,
+ .owner = THIS_MODULE,
+};
+
+static struct miscdevice mdesc_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "mdesc",
+ .fops = &mdesc_fops,
+};
+
+static int __init mdesc_misc_init(void)
+{
+ return misc_register(&mdesc_misc);
+}
+
+__initcall(mdesc_misc_init);
+
+void __init sun4v_mdesc_init(void)
+{
+ struct mdesc_handle *hp;
+ unsigned long len, real_len, status;
+
+ (void) sun4v_mach_desc(0UL, 0UL, &len);
+
+ printk("MDESC: Size is %lu bytes.\n", len);
+
+ hp = mdesc_alloc(len, &memblock_mdesc_ops);
+ if (hp == NULL) {
+ prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
+ prom_halt();
+ }
+
+ status = sun4v_mach_desc(__pa(&hp->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);
+ mdesc_free(hp);
+ prom_halt();
+ }
+
+ cur_mdesc = hp;
+
+ mdesc_adi_init();
+ report_platform_properties();
+}