/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2004-2005 Silicon Graphics, Inc. All rights reserved. * * SGI Altix topology and hardware performance monitoring API. * Mark Goodwin . * * Creates /proc/sgi_sn/sn_topology (read-only) to export * info about Altix nodes, routers, CPUs and NumaLink * interconnection/topology. * * Also creates a dynamic misc device named "sn_hwperf" * that supports an ioctl interface to call down into SAL * to discover hw objects, topology and to read/write * memory mapped registers, e.g. for performance monitoring. * The "sn_hwperf" device is registered only after the procfs * file is first opened, i.e. only if/when it's needed. * * This API is used by SGI Performance Co-Pilot and other * tools, see http://oss.sgi.com/projects/pcp */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void *sn_hwperf_salheap = NULL; static int sn_hwperf_obj_cnt = 0; static nasid_t sn_hwperf_master_nasid = INVALID_NASID; static int sn_hwperf_init(void); static DECLARE_MUTEX(sn_hwperf_init_mutex); static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret) { int e; u64 sz; struct sn_hwperf_object_info *objbuf = NULL; if ((e = sn_hwperf_init()) < 0) { printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e); goto out; } sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info); if ((objbuf = (struct sn_hwperf_object_info *) vmalloc(sz)) == NULL) { printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz); e = -ENOMEM; goto out; } e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS, 0, sz, (u64) objbuf, 0, 0, NULL); if (e != SN_HWPERF_OP_OK) { e = -EINVAL; vfree(objbuf); } out: *nobj = sn_hwperf_obj_cnt; *ret = objbuf; return e; } static int sn_hwperf_location_to_bpos(char *location, int *rack, int *bay, int *slot, int *slab) { char type; /* first scan for an old style geoid string */ if (sscanf(location, "%03d%c%02d#%d", rack, &type, bay, slab) == 4) *slot = 0; else /* scan for a new bladed geoid string */ if (sscanf(location, "%03d%c%02d^%02d#%d", rack, &type, bay, slot, slab) != 5) return -1; /* success */ return 0; } static int sn_hwperf_geoid_to_cnode(char *location) { int cnode; geoid_t geoid; moduleid_t module_id; int rack, bay, slot, slab; int this_rack, this_bay, this_slot, this_slab; if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab)) return -1; for_each_node(cnode) { geoid = cnodeid_get_geoid(cnode); module_id = geo_module(geoid); this_rack = MODULE_GET_RACK(module_id); this_bay = MODULE_GET_BPOS(module_id); this_slot = geo_slot(geoid); this_slab = geo_slab(geoid); if (rack == this_rack && bay == this_bay && slot == this_slot && slab == this_slab) { break; } } return node_possible(cnode) ? cnode : -1; } static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj) { if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)) BUG(); if (!obj->sn_hwp_this_part) return -1; return sn_hwperf_geoid_to_cnode(obj->location); } static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj, struct sn_hwperf_object_info *objs) { int ordinal; struct sn_hwperf_object_info *p; for (ordinal=0, p=objs; p != obj; p++) { if (SN_HWPERF_FOREIGN(p)) continue; if (SN_HWPERF_SAME_OBJTYPE(p, obj)) ordinal++; } return ordinal; } static const char *slabname_node = "node"; /* SHub asic */ static const char *slabname_ionode = "ionode"; /* TIO asic */ static const char *slabname_router = "router"; /* NL3R or NL4R */ static const char *slabname_other = "other"; /* unknown asic */ static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj, struct sn_hwperf_object_info *objs, int *ordinal) { int isnode; const char *slabname = slabname_other; if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) { slabname = isnode ? slabname_node : slabname_ionode; *ordinal = sn_hwperf_obj_to_cnode(obj); } else { *ordinal = sn_hwperf_generic_ordinal(obj, objs); if (SN_HWPERF_IS_ROUTER(obj)) slabname = slabname_router; } return slabname; } static void print_pci_topology(struct seq_file *s) { char *p; size_t sz; int e; for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) { if (!(p = (char *)kmalloc(sz, GFP_KERNEL))) break; e = ia64_sn_ioif_get_pci_topology(__pa(p), sz); if (e == SALRET_OK) seq_puts(s, p); kfree(p); if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED) break; } } static inline int sn_hwperf_has_cpus(cnodeid_t node) { return node_online(node) && nr_cpus_node(node); } static inline int sn_hwperf_has_mem(cnodeid_t node) { return node_online(node) && NODE_DATA(node)->node_present_pages; } static struct sn_hwperf_object_info * sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf, int nobj, int id) { int i; struct sn_hwperf_object_info *p = objbuf; for (i=0; i < nobj; i++, p++) { if (p->id == id) return p; } return NULL; } static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf, int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node) { int e; struct sn_hwperf_object_info *nodeobj = NULL; struct sn_hwperf_object_info *op; struct sn_hwperf_object_info *dest; struct sn_hwperf_object_info *router; struct sn_hwperf_port_info ptdata[16]; int sz, i, j; cnodeid_t c; int found_mem = 0; int found_cpu = 0; if (!node_possible(node)) return -EINVAL; if (sn_hwperf_has_cpus(node)) { if (near_cpu_node) *near_cpu_node = node; found_cpu++; } if (sn_hwperf_has_mem(node)) { if (near_mem_node) *near_mem_node = node; found_mem++; } if (found_cpu && found_mem) return 0; /* trivially successful */ /* find the argument node object */ for (i=0, op=objbuf; i < nobj; i++, op++) { if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op)) continue; if (node == sn_hwperf_obj_to_cnode(op)) { nodeobj = op; break; } } if (!nodeobj) { e = -ENOENT; goto err; } /* get it's interconnect topology */ sz = op->ports * sizeof(struct sn_hwperf_port_info); if (sz > sizeof(ptdata)) BUG(); e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_PORTS, nodeobj->id, sz, (u64)&ptdata, 0, 0, NULL); if (e != SN_HWPERF_OP_OK) { e = -EINVAL; goto err; } /* find nearest node with cpus and nearest memory */ for (router=NULL, j=0; j < op->ports; j++) { dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id); if (!dest || SN_HWPERF_FOREIGN(dest) || !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) { continue; } c = sn_hwperf_obj_to_cnode(dest); if (!found_cpu && sn_hwperf_has_cpus(c)) { if (near_cpu_node) *near_cpu_node = c; found_cpu++; } if (!found_mem && sn_hwperf_has_mem(c)) { if (near_mem_node) *near_mem_node = c; found_mem++; } if (SN_HWPERF_IS_ROUTER(dest)) router = dest; } if (router && (!found_cpu || !found_mem)) { /* search for a node connected to the same router */ sz = router->ports * sizeof(struct sn_hwperf_port_info); if (sz > sizeof(ptdata)) BUG(); e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_PORTS, router->id, sz, (u64)&ptdata, 0, 0, NULL); if (e != SN_HWPERF_OP_OK) { e = -EINVAL; goto err; } for (j=0; j < router->ports; j++) { dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id); if (!dest || dest->id == node || SN_HWPERF_FOREIGN(dest) || !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) { continue; } c = sn_hwperf_obj_to_cnode(dest); if (!found_cpu && sn_hwperf_has_cpus(c)) { if (near_cpu_node) *near_cpu_node = c; found_cpu++; } if (!found_mem && sn_hwperf_has_mem(c)) { if (near_mem_node) *near_mem_node = c; found_mem++; } if (found_cpu && found_mem) break; } } if (!found_cpu || !found_mem) { /* resort to _any_ node with CPUs and memory */ for (i=0, op=objbuf; i < nobj; i++, op++) { if (SN_HWPERF_FOREIGN(op) || SN_HWPERF_IS_IONODE(op) || !SN_HWPERF_IS_NODE(op)) { continue; } c = sn_hwperf_obj_to_cnode(op); if (!found_cpu && sn_hwperf_has_cpus(c)) { if (near_cpu_node) *near_cpu_node = c; found_cpu++; } if (!found_mem && sn_hwperf_has_mem(c)) { if (near_mem_node) *near_mem_node = c; found_mem++; } if (found_cpu && found_mem) break; } } if (!found_cpu || !found_mem) e = -ENODATA; err: return e; } static int sn_topology_show(struct seq_file *s, void *d) { int sz; int pt; int e = 0; int i; int j; const char *slabname; int ordinal; cpumask_t cpumask; char slice; struct cpuinfo_ia64 *c; struct sn_hwperf_port_info *ptdata; struct sn_hwperf_object_info *p; struct sn_hwperf_object_info *obj = d; /* this object */ struct sn_hwperf_object_info *objs = s->private; /* all objects */ u8 shubtype; u8 system_size; u8 sharing_size; u8 partid; u8 coher; u8 nasid_shift; u8 region_size; u16 nasid_mask; int nasid_msb; if (obj == objs) { seq_printf(s, "# sn_topology version 2\n"); seq_printf(s, "# objtype ordinal location partition" " [attribute value [, ...]]\n"); if (ia64_sn_get_sn_info(0, &shubtype, &nasid_mask, &nasid_shift, &system_size, &sharing_size, &partid, &coher, ®ion_size)) BUG(); for (nasid_msb=63; nasid_msb > 0; nasid_msb--) { if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb)) break; } seq_printf(s, "partition %u %s local " "shubtype %s, " "nasid_mask 0x%016lx, " "nasid_bits %d:%d, " "system_size %d, " "sharing_size %d, " "coherency_domain %d, " "region_size %d\n", partid, system_utsname.nodename, shubtype ? "shub2" : "shub1", (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift, system_size, sharing_size, coher, region_size); print_pci_topology(s); } if (SN_HWPERF_FOREIGN(obj)) { /* private in another partition: not interesting */ return 0; } for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) { if (obj->name[i] == ' ') obj->name[i] = '_'; } slabname = sn_hwperf_get_slabname(obj, objs, &ordinal); seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location, obj->sn_hwp_this_part ? "local" : "shared", obj->name); if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)) seq_putc(s, '\n'); else { cnodeid_t near_mem = -1; cnodeid_t near_cpu = -1; seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal)); if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt, ordinal, &near_mem, &near_cpu) == 0) { seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d", near_mem, near_cpu); } if (!SN_HWPERF_IS_IONODE(obj)) { for_each_online_node(i) { seq_printf(s, i ? ":%d" : ", dist %d", node_distance(ordinal, i)); } } seq_putc(s, '\n'); /* * CPUs on this node, if any */ cpumask = node_to_cpumask(ordinal); for_each_online_cpu(i) { if (cpu_isset(i, cpumask)) { slice = 'a' + cpuid_to_slice(i); c = cpu_data(i); seq_printf(s, "cpu %d %s%c local" " freq %luMHz, arch ia64", i, obj->location, slice, c->proc_freq / 1000000); for_each_online_cpu(j) { seq_printf(s, j ? ":%d" : ", dist %d", node_distance( cpu_to_node(i), cpu_to_node(j))); } seq_putc(s, '\n'); } } } if (obj->ports) { /* * numalink ports */ sz = obj->ports * sizeof(struct sn_hwperf_port_info); if ((ptdata = vmalloc(sz)) == NULL) return -ENOMEM; e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_PORTS, obj->id, sz, (u64) ptdata, 0, 0, NULL); if (e != SN_HWPERF_OP_OK) return -EINVAL; for (ordinal=0, p=objs; p != obj; p++) { if (!SN_HWPERF_FOREIGN(p)) ordinal += p->ports; } for (pt = 0; pt < obj->ports; pt++) { for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) { if (ptdata[pt].conn_id == p->id) { break; } } seq_printf(s, "numalink %d %s-%d", ordinal+pt, obj->location, ptdata[pt].port); if (i >= sn_hwperf_obj_cnt) { /* no connection */ seq_puts(s, " local endpoint disconnected" ", protocol unknown\n"); continue; } if (obj->sn_hwp_this_part && p->sn_hwp_this_part) /* both ends local to this partition */ seq_puts(s, " local"); else if (!obj->sn_hwp_this_part && !p->sn_hwp_this_part) /* both ends of the link in foreign partiton */ seq_puts(s, " foreign"); else /* link straddles a partition */ seq_puts(s, " shared"); /* * Unlikely, but strictly should query the LLP config * registers because an NL4R can be configured to run * NL3 protocol, even when not talking to an NL3 router. * Ditto for node-node. */ seq_printf(s, " endpoint %s-%d, protocol %s\n", p->location, ptdata[pt].conn_port, (SN_HWPERF_IS_NL3ROUTER(obj) || SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4"); } vfree(ptdata); } return 0; } static void *sn_topology_start(struct seq_file *s, loff_t * pos) { struct sn_hwperf_object_info *objs = s->private; if (*pos < sn_hwperf_obj_cnt) return (void *)(objs + *pos); return NULL; } static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos) { ++*pos; return sn_topology_start(s, pos); } static void sn_topology_stop(struct seq_file *m, void *v) { return; } /* * /proc/sgi_sn/sn_topology, read-only using seq_file */ static struct seq_operations sn_topology_seq_ops = { .start = sn_topology_start, .next = sn_topology_next, .stop = sn_topology_stop, .show = sn_topology_show }; struct sn_hwperf_op_info { u64 op; struct sn_hwperf_ioctl_args *a; void *p; int *v0; int ret; }; static void sn_hwperf_call_sal(void *info) { struct sn_hwperf_op_info *op_info = info; int r; r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op, op_info->a->arg, op_info->a->sz, (u64) op_info->p, 0, 0, op_info->v0); op_info->ret = r; } static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info) { u32 cpu; u32 use_ipi; int r = 0; cpumask_t save_allowed; cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32; use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK; op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK; if (cpu != SN_HWPERF_ARG_ANY_CPU) { if (cpu >= num_online_cpus() || !cpu_online(cpu)) { r = -EINVAL; goto out; } } if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) { /* don't care, or already on correct cpu */ sn_hwperf_call_sal(op_info); } else { if (use_ipi) { /* use an interprocessor interrupt to call SAL */ smp_call_function_single(cpu, sn_hwperf_call_sal, op_info, 1, 1); } else { /* migrate the task before calling SAL */ save_allowed = current->cpus_allowed; set_cpus_allowed(current, cpumask_of_cpu(cpu)); sn_hwperf_call_sal(op_info); set_cpus_allowed(current, save_allowed); } } r = op_info->ret; out: return r; } /* map SAL hwperf error code to system error code */ static int sn_hwperf_map_err(int hwperf_err) { int e; switch(hwperf_err) { case SN_HWPERF_OP_OK: e = 0; break; case SN_HWPERF_OP_NOMEM: e = -ENOMEM; break; case SN_HWPERF_OP_NO_PERM: e = -EPERM; break; case SN_HWPERF_OP_IO_ERROR: e = -EIO; break; case SN_HWPERF_OP_BUSY: e = -EBUSY; break; case SN_HWPERF_OP_RECONFIGURE: e = -EAGAIN; break; case SN_HWPERF_OP_INVAL: default: e = -EINVAL; break; } return e; } /* * ioctl for "sn_hwperf" misc device */ static int sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg) { struct sn_hwperf_ioctl_args a; struct cpuinfo_ia64 *cdata; struct sn_hwperf_object_info *objs; struct sn_hwperf_object_info *cpuobj; struct sn_hwperf_op_info op_info; void *p = NULL; int nobj; char slice; int node; int r; int v0; int i; int j; unlock_kernel(); /* only user requests are allowed here */ if ((op & SN_HWPERF_OP_MASK) < 10) { r = -EINVAL; goto error; } r = copy_from_user(&a, (const void __user *)arg, sizeof(struct sn_hwperf_ioctl_args)); if (r != 0) { r = -EFAULT; goto error; } /* * Allocate memory to hold a kernel copy of the user buffer. The * buffer contents are either copied in or out (or both) of user * space depending on the flags encoded in the requested operation. */ if (a.ptr) { p = vmalloc(a.sz); if (!p) { r = -ENOMEM; goto error; } } if (op & SN_HWPERF_OP_MEM_COPYIN) { r = copy_from_user(p, (const void __user *)a.ptr, a.sz); if (r != 0) { r = -EFAULT; goto error; } } switch (op) { case SN_HWPERF_GET_CPU_INFO: if (a.sz == sizeof(u64)) { /* special case to get size needed */ *(u64 *) p = (u64) num_online_cpus() * sizeof(struct sn_hwperf_object_info); } else if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) { r = -ENOMEM; goto error; } else if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { memset(p, 0, a.sz); for (i = 0; i < nobj; i++) { if (!SN_HWPERF_IS_NODE(objs + i)) continue; node = sn_hwperf_obj_to_cnode(objs + i); for_each_online_cpu(j) { if (node != cpu_to_node(j)) continue; cpuobj = (struct sn_hwperf_object_info *) p + j; slice = 'a' + cpuid_to_slice(j); cdata = cpu_data(j); cpuobj->id = j; snprintf(cpuobj->name, sizeof(cpuobj->name), "CPU %luMHz %s", cdata->proc_freq / 1000000, cdata->vendor); snprintf(cpuobj->location, sizeof(cpuobj->location), "%s%c", objs[i].location, slice); } } vfree(objs); } break; case SN_HWPERF_GET_NODE_NASID: if (a.sz != sizeof(u64) || (node = a.arg) < 0 || !node_possible(node)) { r = -EINVAL; goto error; } *(u64 *)p = (u64)cnodeid_to_nasid(node); break; case SN_HWPERF_GET_OBJ_NODE: if (a.sz != sizeof(u64) || a.arg < 0) { r = -EINVAL; goto error; } if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { if (a.arg >= nobj) { r = -EINVAL; vfree(objs); goto error; } if (objs[(i = a.arg)].id != a.arg) { for (i = 0; i < nobj; i++) { if (objs[i].id == a.arg) break; } } if (i == nobj) { r = -EINVAL; vfree(objs); goto error; } if (!SN_HWPERF_IS_NODE(objs + i) && !SN_HWPERF_IS_IONODE(objs + i)) { r = -ENOENT; vfree(objs); goto error; } *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i); vfree(objs); } break; case SN_HWPERF_GET_MMRS: case SN_HWPERF_SET_MMRS: case SN_HWPERF_OBJECT_DISTANCE: op_info.p = p; op_info.a = &a; op_info.v0 = &v0; op_info.op = op; r = sn_hwperf_op_cpu(&op_info); if (r) { r = sn_hwperf_map_err(r); a.v0 = v0; goto error; } break; default: /* all other ops are a direct SAL call */ r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op, a.arg, a.sz, (u64) p, 0, 0, &v0); if (r) { r = sn_hwperf_map_err(r); goto error; } a.v0 = v0; break; } if (op & SN_HWPERF_OP_MEM_COPYOUT) { r = copy_to_user((void __user *)a.ptr, p, a.sz); if (r != 0) { r = -EFAULT; goto error; } } error: vfree(p); lock_kernel(); return r; } static struct file_operations sn_hwperf_fops = { .ioctl = sn_hwperf_ioctl, }; static struct miscdevice sn_hwperf_dev = { MISC_DYNAMIC_MINOR, "sn_hwperf", &sn_hwperf_fops }; static int sn_hwperf_init(void) { u64 v; int salr; int e = 0; /* single threaded, once-only initialization */ down(&sn_hwperf_init_mutex); if (sn_hwperf_salheap) { up(&sn_hwperf_init_mutex); return e; } /* * The PROM code needs a fixed reference node. For convenience the * same node as the console I/O is used. */ sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid(); /* * Request the needed size and install the PROM scratch area. * The PROM keeps various tracking bits in this memory area. */ salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, (u64) SN_HWPERF_GET_HEAPSIZE, 0, (u64) sizeof(u64), (u64) &v, 0, 0, NULL); if (salr != SN_HWPERF_OP_OK) { e = -EINVAL; goto out; } if ((sn_hwperf_salheap = vmalloc(v)) == NULL) { e = -ENOMEM; goto out; } salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_INSTALL_HEAP, 0, v, (u64) sn_hwperf_salheap, 0, 0, NULL); if (salr != SN_HWPERF_OP_OK) { e = -EINVAL; goto out; } salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_OBJECT_COUNT, 0, sizeof(u64), (u64) &v, 0, 0, NULL); if (salr != SN_HWPERF_OP_OK) { e = -EINVAL; goto out; } sn_hwperf_obj_cnt = (int)v; out: if (e < 0 && sn_hwperf_salheap) { vfree(sn_hwperf_salheap); sn_hwperf_salheap = NULL; sn_hwperf_obj_cnt = 0; } up(&sn_hwperf_init_mutex); return e; } int sn_topology_open(struct inode *inode, struct file *file) { int e; struct seq_file *seq; struct sn_hwperf_object_info *objbuf; int nobj; if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { e = seq_open(file, &sn_topology_seq_ops); seq = file->private_data; seq->private = objbuf; } return e; } int sn_topology_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; vfree(seq->private); return seq_release(inode, file); } int sn_hwperf_get_nearest_node(cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node) { int e; int nobj; struct sn_hwperf_object_info *objbuf; if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj, node, near_mem_node, near_cpu_node); vfree(objbuf); } return e; } static int __devinit sn_hwperf_misc_register_init(void) { int e; sn_hwperf_init(); /* * Register a dynamic misc device for hwperf ioctls. Platforms * supporting hotplug will create /dev/sn_hwperf, else user * can to look up the minor number in /proc/misc. */ if ((e = misc_register(&sn_hwperf_dev)) != 0) { printk(KERN_ERR "sn_hwperf_misc_register_init: failed to " "register misc device for \"%s\"\n", sn_hwperf_dev.name); } return e; } device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */ EXPORT_SYMBOL(sn_hwperf_get_nearest_node);