| // 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/log2.h> |
| #include <linux/list.h> |
| #include <linux/slab.h> |
| #include <linux/mm.h> |
| #include <linux/miscdevice.h> |
| #include <linux/memblock.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_phys_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); |
| memblock_free_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(); |
| } |