/* 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/lmb.h> #include <linux/log2.h> #include <linux/list.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/miscdevice.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 */ } __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; atomic_t refcnt; unsigned int handle_size; struct mdesc_hdr mdesc; }; 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; atomic_set(&hp->refcnt, 1); hp->handle_size = handle_size; } static struct mdesc_handle * __init mdesc_lmb_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 = lmb_alloc(alloc_size, PAGE_SIZE); hp = NULL; if (paddr) { hp = __va(paddr); mdesc_handle_init(hp, handle_size, hp); } return hp; } static void mdesc_lmb_free(struct mdesc_handle *hp) { unsigned int alloc_size, handle_size = hp->handle_size; unsigned long start, end; BUG_ON(atomic_read(&hp->refcnt) != 0); BUG_ON(!list_empty(&hp->list)); alloc_size = PAGE_ALIGN(handle_size); start = (unsigned long) hp; end = start + alloc_size; while (start < end) { struct page *p; p = virt_to_page(start); ClearPageReserved(p); __free_page(p); start += PAGE_SIZE; } } static struct mdesc_mem_ops lmb_mdesc_ops = { .alloc = mdesc_lmb_alloc, .free = mdesc_lmb_free, }; static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size) { unsigned int handle_size; void *base; handle_size = (sizeof(struct mdesc_handle) - sizeof(struct mdesc_hdr) + mdesc_size); base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL); if (base) { struct mdesc_handle *hp; unsigned long addr; addr = (unsigned long)base; addr = (addr + 15UL) & ~15UL; hp = (struct mdesc_handle *) addr; mdesc_handle_init(hp, handle_size, base); return hp; } return NULL; } static void mdesc_kfree(struct mdesc_handle *hp) { BUG_ON(atomic_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) atomic_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 (atomic_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) { u64 node; mutex_lock(&mdesc_mutex); client->next = client_list; client_list = client; mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name) client->add(cur_mdesc, node); 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; } /* 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)) { u64 node; mdesc_for_each_node_by_name(a, node, name) { int found = 0, is_vdc_port = 0; const char *name_prop; const u64 *id; u64 fnode; name_prop = mdesc_get_property(a, node, "name", NULL); if (name_prop && !strcmp(name_prop, "vdc-port")) { is_vdc_port = 1; id = parent_cfg_handle(a, node); } else id = mdesc_get_property(a, node, "id", NULL); if (!id) { printk(KERN_ERR "MD: Cannot find ID for %s node.\n", (name_prop ? name_prop : name)); continue; } mdesc_for_each_node_by_name(b, fnode, name) { const u64 *fid; if (is_vdc_port) { name_prop = mdesc_get_property(b, fnode, "name", NULL); if (!name_prop || strcmp(name_prop, "vdc-port")) continue; fid = parent_cfg_handle(b, fnode); if (!fid) { printk(KERN_ERR "MD: Cannot find ID " "for vdc-port node.\n"); continue; } } else fid = mdesc_get_property(b, fnode, "id", NULL); if (*id == *fid) { found = 1; break; } } if (!found) func(a, node); } } 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); atomic_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 (atomic_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); } 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 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 [%08lx]\n", *v); v = mdesc_get_property(hp, pn, "serial#", NULL); if (v) printk("PLATFORM: serial# [%08lx]\n", *v); v = mdesc_get_property(hp, pn, "stick-frequency", NULL); printk("PLATFORM: stick-frequency [%08lx]\n", *v); v = mdesc_get_property(hp, pn, "mac-address", NULL); if (v) printk("PLATFORM: mac-address [%lx]\n", *v); v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL); if (v) printk("PLATFORM: watchdog-resolution [%lu ms]\n", *v); v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL); if (v) printk("PLATFORM: watchdog-max-timeout [%lu ms]\n", *v); v = mdesc_get_property(hp, pn, "max-cpus", NULL); if (v) printk("PLATFORM: max-cpus [%lu]\n", *v); #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++) cpu_set(i, cpu_possible_map); } #endif mdesc_release(hp); } static void __devinit 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 __devinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_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")) { id = mdesc_get_property(hp, t, "id", NULL); if (*id < NR_CPUS) cpu_data(*id).core_id = core_id; } else { u64 j; mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) { u64 n = mdesc_arc_target(hp, j); const char *n_name; n_name = mdesc_node_name(hp, n); if (strcmp(n_name, "cpu")) continue; id = mdesc_get_property(hp, n, "id", NULL); if (*id < NR_CPUS) cpu_data(*id).core_id = core_id; } } } } static void __devinit set_core_ids(struct mdesc_handle *hp) { int idx; u64 mp; idx = 1; 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 void __devinit 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 __devinit __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 __devinit set_proc_ids(struct mdesc_handle *hp) { __set_proc_ids(hp, "exec_unit"); __set_proc_ids(hp, "exec-unit"); } static void __devinit 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 __devinit get_mondo_data(struct mdesc_handle *hp, u64 mp, struct trap_per_cpu *tb) { const u64 *val; val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7); val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7); val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); get_one_mondo_bits(val, &tb->resum_qmask, 6); val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); get_one_mondo_bits(val, &tb->nonresum_qmask, 2); } void __cpuinit mdesc_fill_in_cpu_data(cpumask_t mask) { struct mdesc_handle *hp = mdesc_grab(); u64 mp; ncpus_probed = 0; mdesc_for_each_node_by_name(hp, mp, "cpu") { const u64 *id = mdesc_get_property(hp, mp, "id", NULL); const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); struct trap_per_cpu *tb; cpuinfo_sparc *c; int cpuid; u64 a; ncpus_probed++; 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 (!cpu_isset(cpuid, mask)) 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(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); } } #ifdef CONFIG_SMP cpu_set(cpuid, cpu_present_map); #endif c->core_id = 0; c->proc_id = -1; } #ifdef CONFIG_SMP sparc64_multi_core = 1; #endif set_core_ids(hp); set_proc_ids(hp); smp_fill_in_sib_core_maps(); mdesc_release(hp); } static ssize_t mdesc_read(struct file *file, char __user *buf, size_t len, loff_t *offp) { struct mdesc_handle *hp = mdesc_grab(); int err; if (!hp) return -ENODEV; err = hp->handle_size; if (len < hp->handle_size) err = -EMSGSIZE; else if (copy_to_user(buf, &hp->mdesc, hp->handle_size)) err = -EFAULT; mdesc_release(hp); return err; } static const struct file_operations mdesc_fops = { .read = mdesc_read, .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; cpumask_t mask; (void) sun4v_mach_desc(0UL, 0UL, &len); printk("MDESC: Size is %lu bytes.\n", len); hp = mdesc_alloc(len, &lmb_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; report_platform_properties(); cpus_setall(mask); mdesc_fill_in_cpu_data(mask); }