2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
8 * SGI Altix topology and hardware performance monitoring API.
9 * Mark Goodwin <markgw@sgi.com>.
11 * Creates /proc/sgi_sn/sn_topology (read-only) to export
12 * info about Altix nodes, routers, CPUs and NumaLink
13 * interconnection/topology.
15 * Also creates a dynamic misc device named "sn_hwperf"
16 * that supports an ioctl interface to call down into SAL
17 * to discover hw objects, topology and to read/write
18 * memory mapped registers, e.g. for performance monitoring.
19 * The "sn_hwperf" device is registered only after the procfs
20 * file is first opened, i.e. only if/when it's needed.
22 * This API is used by SGI Performance Co-Pilot and other
23 * tools, see http://oss.sgi.com/projects/pcp
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/seq_file.h>
30 #include <linux/miscdevice.h>
31 #include <linux/utsname.h>
32 #include <linux/cpumask.h>
33 #include <linux/smp_lock.h>
34 #include <linux/nodemask.h>
35 #include <asm/processor.h>
36 #include <asm/topology.h>
38 #include <asm/semaphore.h>
39 #include <asm/uaccess.h>
41 #include <asm/sn/io.h>
42 #include <asm/sn/sn_sal.h>
43 #include <asm/sn/module.h>
44 #include <asm/sn/geo.h>
45 #include <asm/sn/sn2/sn_hwperf.h>
46 #include <asm/sn/addrs.h>
48 static void *sn_hwperf_salheap = NULL;
49 static int sn_hwperf_obj_cnt = 0;
50 static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
51 static int sn_hwperf_init(void);
52 static DECLARE_MUTEX(sn_hwperf_init_mutex);
54 #define cnode_possible(n) ((n) < num_cnodes)
56 static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
60 struct sn_hwperf_object_info *objbuf = NULL;
62 if ((e = sn_hwperf_init()) < 0) {
63 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
67 sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
68 if ((objbuf = (struct sn_hwperf_object_info *) vmalloc(sz)) == NULL) {
69 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
74 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
75 0, sz, (u64) objbuf, 0, 0, NULL);
76 if (e != SN_HWPERF_OP_OK) {
82 *nobj = sn_hwperf_obj_cnt;
87 static int sn_hwperf_location_to_bpos(char *location,
88 int *rack, int *bay, int *slot, int *slab)
92 /* first scan for an old style geoid string */
93 if (sscanf(location, "%03d%c%02d#%d",
94 rack, &type, bay, slab) == 4)
96 else /* scan for a new bladed geoid string */
97 if (sscanf(location, "%03d%c%02d^%02d#%d",
98 rack, &type, bay, slot, slab) != 5)
104 static int sn_hwperf_geoid_to_cnode(char *location)
108 moduleid_t module_id;
109 int rack, bay, slot, slab;
110 int this_rack, this_bay, this_slot, this_slab;
112 if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
116 * FIXME: replace with cleaner for_each_XXX macro which addresses
117 * both compute and IO nodes once ACPI3.0 is available.
119 for (cnode = 0; cnode < num_cnodes; cnode++) {
120 geoid = cnodeid_get_geoid(cnode);
121 module_id = geo_module(geoid);
122 this_rack = MODULE_GET_RACK(module_id);
123 this_bay = MODULE_GET_BPOS(module_id);
124 this_slot = geo_slot(geoid);
125 this_slab = geo_slab(geoid);
126 if (rack == this_rack && bay == this_bay &&
127 slot == this_slot && slab == this_slab) {
132 return cnode_possible(cnode) ? cnode : -1;
135 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
137 if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
139 if (SN_HWPERF_FOREIGN(obj))
141 return sn_hwperf_geoid_to_cnode(obj->location);
144 static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
145 struct sn_hwperf_object_info *objs)
148 struct sn_hwperf_object_info *p;
150 for (ordinal=0, p=objs; p != obj; p++) {
151 if (SN_HWPERF_FOREIGN(p))
153 if (SN_HWPERF_SAME_OBJTYPE(p, obj))
160 static const char *slabname_node = "node"; /* SHub asic */
161 static const char *slabname_ionode = "ionode"; /* TIO asic */
162 static const char *slabname_router = "router"; /* NL3R or NL4R */
163 static const char *slabname_other = "other"; /* unknown asic */
165 static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
166 struct sn_hwperf_object_info *objs, int *ordinal)
169 const char *slabname = slabname_other;
171 if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
172 slabname = isnode ? slabname_node : slabname_ionode;
173 *ordinal = sn_hwperf_obj_to_cnode(obj);
176 *ordinal = sn_hwperf_generic_ordinal(obj, objs);
177 if (SN_HWPERF_IS_ROUTER(obj))
178 slabname = slabname_router;
184 static void print_pci_topology(struct seq_file *s)
190 for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
191 if (!(p = (char *)kmalloc(sz, GFP_KERNEL)))
193 e = ia64_sn_ioif_get_pci_topology(__pa(p), sz);
197 if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED)
202 static inline int sn_hwperf_has_cpus(cnodeid_t node)
204 return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
207 static inline int sn_hwperf_has_mem(cnodeid_t node)
209 return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages;
212 static struct sn_hwperf_object_info *
213 sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
217 struct sn_hwperf_object_info *p = objbuf;
219 for (i=0; i < nobj; i++, p++) {
228 static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf,
229 int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
232 struct sn_hwperf_object_info *nodeobj = NULL;
233 struct sn_hwperf_object_info *op;
234 struct sn_hwperf_object_info *dest;
235 struct sn_hwperf_object_info *router;
236 struct sn_hwperf_port_info ptdata[16];
242 if (!cnode_possible(node))
245 if (sn_hwperf_has_cpus(node)) {
247 *near_cpu_node = node;
251 if (sn_hwperf_has_mem(node)) {
253 *near_mem_node = node;
257 if (found_cpu && found_mem)
258 return 0; /* trivially successful */
260 /* find the argument node object */
261 for (i=0, op=objbuf; i < nobj; i++, op++) {
262 if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op))
264 if (node == sn_hwperf_obj_to_cnode(op)) {
274 /* get it's interconnect topology */
275 sz = op->ports * sizeof(struct sn_hwperf_port_info);
276 if (sz > sizeof(ptdata))
278 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
279 SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
280 (u64)&ptdata, 0, 0, NULL);
281 if (e != SN_HWPERF_OP_OK) {
286 /* find nearest node with cpus and nearest memory */
287 for (router=NULL, j=0; j < op->ports; j++) {
288 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
289 if (dest && SN_HWPERF_IS_ROUTER(dest))
291 if (!dest || SN_HWPERF_FOREIGN(dest) ||
292 !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
295 c = sn_hwperf_obj_to_cnode(dest);
296 if (!found_cpu && sn_hwperf_has_cpus(c)) {
301 if (!found_mem && sn_hwperf_has_mem(c)) {
308 if (router && (!found_cpu || !found_mem)) {
309 /* search for a node connected to the same router */
310 sz = router->ports * sizeof(struct sn_hwperf_port_info);
311 if (sz > sizeof(ptdata))
313 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
314 SN_HWPERF_ENUM_PORTS, router->id, sz,
315 (u64)&ptdata, 0, 0, NULL);
316 if (e != SN_HWPERF_OP_OK) {
320 for (j=0; j < router->ports; j++) {
321 dest = sn_hwperf_findobj_id(objbuf, nobj,
323 if (!dest || dest->id == node ||
324 SN_HWPERF_FOREIGN(dest) ||
325 !SN_HWPERF_IS_NODE(dest) ||
326 SN_HWPERF_IS_IONODE(dest)) {
329 c = sn_hwperf_obj_to_cnode(dest);
330 if (!found_cpu && sn_hwperf_has_cpus(c)) {
335 if (!found_mem && sn_hwperf_has_mem(c)) {
340 if (found_cpu && found_mem)
345 if (!found_cpu || !found_mem) {
346 /* resort to _any_ node with CPUs and memory */
347 for (i=0, op=objbuf; i < nobj; i++, op++) {
348 if (SN_HWPERF_FOREIGN(op) ||
349 SN_HWPERF_IS_IONODE(op) ||
350 !SN_HWPERF_IS_NODE(op)) {
353 c = sn_hwperf_obj_to_cnode(op);
354 if (!found_cpu && sn_hwperf_has_cpus(c)) {
359 if (!found_mem && sn_hwperf_has_mem(c)) {
364 if (found_cpu && found_mem)
369 if (!found_cpu || !found_mem)
377 static int sn_topology_show(struct seq_file *s, void *d)
384 const char *slabname;
388 struct cpuinfo_ia64 *c;
389 struct sn_hwperf_port_info *ptdata;
390 struct sn_hwperf_object_info *p;
391 struct sn_hwperf_object_info *obj = d; /* this object */
392 struct sn_hwperf_object_info *objs = s->private; /* all objects */
404 seq_printf(s, "# sn_topology version 2\n");
405 seq_printf(s, "# objtype ordinal location partition"
406 " [attribute value [, ...]]\n");
408 if (ia64_sn_get_sn_info(0,
409 &shubtype, &nasid_mask, &nasid_shift, &system_size,
410 &sharing_size, &partid, &coher, ®ion_size))
412 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
413 if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
416 seq_printf(s, "partition %u %s local "
418 "nasid_mask 0x%016lx, "
422 "coherency_domain %d, "
425 partid, system_utsname.nodename,
426 shubtype ? "shub2" : "shub1",
427 (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
428 system_size, sharing_size, coher, region_size);
430 print_pci_topology(s);
433 if (SN_HWPERF_FOREIGN(obj)) {
434 /* private in another partition: not interesting */
438 for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
439 if (obj->name[i] == ' ')
443 slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
444 seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
445 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
447 if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
450 cnodeid_t near_mem = -1;
451 cnodeid_t near_cpu = -1;
453 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
455 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
456 ordinal, &near_mem, &near_cpu) == 0) {
457 seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
461 if (!SN_HWPERF_IS_IONODE(obj)) {
462 for_each_online_node(i) {
463 seq_printf(s, i ? ":%d" : ", dist %d",
464 node_distance(ordinal, i));
471 * CPUs on this node, if any
473 if (!SN_HWPERF_IS_IONODE(obj)) {
474 cpumask = node_to_cpumask(ordinal);
475 for_each_online_cpu(i) {
476 if (cpu_isset(i, cpumask)) {
477 slice = 'a' + cpuid_to_slice(i);
479 seq_printf(s, "cpu %d %s%c local"
480 " freq %luMHz, arch ia64",
481 i, obj->location, slice,
482 c->proc_freq / 1000000);
483 for_each_online_cpu(j) {
484 seq_printf(s, j ? ":%d" : ", dist %d",
499 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
500 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
502 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
503 SN_HWPERF_ENUM_PORTS, obj->id, sz,
504 (u64) ptdata, 0, 0, NULL);
505 if (e != SN_HWPERF_OP_OK)
507 for (ordinal=0, p=objs; p != obj; p++) {
508 if (!SN_HWPERF_FOREIGN(p))
511 for (pt = 0; pt < obj->ports; pt++) {
512 for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
513 if (ptdata[pt].conn_id == p->id) {
517 seq_printf(s, "numalink %d %s-%d",
518 ordinal+pt, obj->location, ptdata[pt].port);
520 if (i >= sn_hwperf_obj_cnt) {
522 seq_puts(s, " local endpoint disconnected"
523 ", protocol unknown\n");
527 if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
528 /* both ends local to this partition */
529 seq_puts(s, " local");
530 else if (SN_HWPERF_FOREIGN(p))
531 /* both ends of the link in foreign partiton */
532 seq_puts(s, " foreign");
534 /* link straddles a partition */
535 seq_puts(s, " shared");
538 * Unlikely, but strictly should query the LLP config
539 * registers because an NL4R can be configured to run
540 * NL3 protocol, even when not talking to an NL3 router.
541 * Ditto for node-node.
543 seq_printf(s, " endpoint %s-%d, protocol %s\n",
544 p->location, ptdata[pt].conn_port,
545 (SN_HWPERF_IS_NL3ROUTER(obj) ||
546 SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4");
554 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
556 struct sn_hwperf_object_info *objs = s->private;
558 if (*pos < sn_hwperf_obj_cnt)
559 return (void *)(objs + *pos);
564 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
567 return sn_topology_start(s, pos);
570 static void sn_topology_stop(struct seq_file *m, void *v)
576 * /proc/sgi_sn/sn_topology, read-only using seq_file
578 static struct seq_operations sn_topology_seq_ops = {
579 .start = sn_topology_start,
580 .next = sn_topology_next,
581 .stop = sn_topology_stop,
582 .show = sn_topology_show
585 struct sn_hwperf_op_info {
587 struct sn_hwperf_ioctl_args *a;
593 static void sn_hwperf_call_sal(void *info)
595 struct sn_hwperf_op_info *op_info = info;
598 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
599 op_info->a->arg, op_info->a->sz,
600 (u64) op_info->p, 0, 0, op_info->v0);
604 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
609 cpumask_t save_allowed;
611 cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
612 use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
613 op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
615 if (cpu != SN_HWPERF_ARG_ANY_CPU) {
616 if (cpu >= NR_CPUS || !cpu_online(cpu)) {
622 if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
623 /* don't care, or already on correct cpu */
624 sn_hwperf_call_sal(op_info);
628 /* use an interprocessor interrupt to call SAL */
629 smp_call_function_single(cpu, sn_hwperf_call_sal,
633 /* migrate the task before calling SAL */
634 save_allowed = current->cpus_allowed;
635 set_cpus_allowed(current, cpumask_of_cpu(cpu));
636 sn_hwperf_call_sal(op_info);
637 set_cpus_allowed(current, save_allowed);
646 /* map SAL hwperf error code to system error code */
647 static int sn_hwperf_map_err(int hwperf_err)
652 case SN_HWPERF_OP_OK:
656 case SN_HWPERF_OP_NOMEM:
660 case SN_HWPERF_OP_NO_PERM:
664 case SN_HWPERF_OP_IO_ERROR:
668 case SN_HWPERF_OP_BUSY:
672 case SN_HWPERF_OP_RECONFIGURE:
676 case SN_HWPERF_OP_INVAL:
686 * ioctl for "sn_hwperf" misc device
689 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
691 struct sn_hwperf_ioctl_args a;
692 struct cpuinfo_ia64 *cdata;
693 struct sn_hwperf_object_info *objs;
694 struct sn_hwperf_object_info *cpuobj;
695 struct sn_hwperf_op_info op_info;
707 /* only user requests are allowed here */
708 if ((op & SN_HWPERF_OP_MASK) < 10) {
712 r = copy_from_user(&a, (const void __user *)arg,
713 sizeof(struct sn_hwperf_ioctl_args));
720 * Allocate memory to hold a kernel copy of the user buffer. The
721 * buffer contents are either copied in or out (or both) of user
722 * space depending on the flags encoded in the requested operation.
732 if (op & SN_HWPERF_OP_MEM_COPYIN) {
733 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
741 case SN_HWPERF_GET_CPU_INFO:
742 if (a.sz == sizeof(u64)) {
743 /* special case to get size needed */
744 *(u64 *) p = (u64) num_online_cpus() *
745 sizeof(struct sn_hwperf_object_info);
747 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
751 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
753 for (i = 0; i < nobj; i++) {
754 int cpuobj_index = 0;
755 if (!SN_HWPERF_IS_NODE(objs + i))
757 node = sn_hwperf_obj_to_cnode(objs + i);
758 for_each_online_cpu(j) {
759 if (node != cpu_to_node(j))
761 cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++;
762 slice = 'a' + cpuid_to_slice(j);
765 snprintf(cpuobj->name,
766 sizeof(cpuobj->name),
768 cdata->proc_freq / 1000000,
770 snprintf(cpuobj->location,
771 sizeof(cpuobj->location),
772 "%s%c", objs[i].location,
781 case SN_HWPERF_GET_NODE_NASID:
782 if (a.sz != sizeof(u64) ||
783 (node = a.arg) < 0 || !cnode_possible(node)) {
787 *(u64 *)p = (u64)cnodeid_to_nasid(node);
790 case SN_HWPERF_GET_OBJ_NODE:
791 if (a.sz != sizeof(u64) || a.arg < 0) {
795 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
801 if (objs[(i = a.arg)].id != a.arg) {
802 for (i = 0; i < nobj; i++) {
803 if (objs[i].id == a.arg)
813 if (!SN_HWPERF_IS_NODE(objs + i) &&
814 !SN_HWPERF_IS_IONODE(objs + i)) {
820 *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
825 case SN_HWPERF_GET_MMRS:
826 case SN_HWPERF_SET_MMRS:
827 case SN_HWPERF_OBJECT_DISTANCE:
832 r = sn_hwperf_op_cpu(&op_info);
834 r = sn_hwperf_map_err(r);
841 /* all other ops are a direct SAL call */
842 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
843 a.arg, a.sz, (u64) p, 0, 0, &v0);
845 r = sn_hwperf_map_err(r);
852 if (op & SN_HWPERF_OP_MEM_COPYOUT) {
853 r = copy_to_user((void __user *)a.ptr, p, a.sz);
867 static struct file_operations sn_hwperf_fops = {
868 .ioctl = sn_hwperf_ioctl,
871 static struct miscdevice sn_hwperf_dev = {
877 static int sn_hwperf_init(void)
883 /* single threaded, once-only initialization */
884 down(&sn_hwperf_init_mutex);
886 if (sn_hwperf_salheap) {
887 up(&sn_hwperf_init_mutex);
892 * The PROM code needs a fixed reference node. For convenience the
893 * same node as the console I/O is used.
895 sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
898 * Request the needed size and install the PROM scratch area.
899 * The PROM keeps various tracking bits in this memory area.
901 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
902 (u64) SN_HWPERF_GET_HEAPSIZE, 0,
903 (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
904 if (salr != SN_HWPERF_OP_OK) {
909 if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
913 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
914 SN_HWPERF_INSTALL_HEAP, 0, v,
915 (u64) sn_hwperf_salheap, 0, 0, NULL);
916 if (salr != SN_HWPERF_OP_OK) {
921 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
922 SN_HWPERF_OBJECT_COUNT, 0,
923 sizeof(u64), (u64) &v, 0, 0, NULL);
924 if (salr != SN_HWPERF_OP_OK) {
928 sn_hwperf_obj_cnt = (int)v;
931 if (e < 0 && sn_hwperf_salheap) {
932 vfree(sn_hwperf_salheap);
933 sn_hwperf_salheap = NULL;
934 sn_hwperf_obj_cnt = 0;
936 up(&sn_hwperf_init_mutex);
940 int sn_topology_open(struct inode *inode, struct file *file)
943 struct seq_file *seq;
944 struct sn_hwperf_object_info *objbuf;
947 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
948 e = seq_open(file, &sn_topology_seq_ops);
949 seq = file->private_data;
950 seq->private = objbuf;
956 int sn_topology_release(struct inode *inode, struct file *file)
958 struct seq_file *seq = file->private_data;
961 return seq_release(inode, file);
964 int sn_hwperf_get_nearest_node(cnodeid_t node,
965 cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
969 struct sn_hwperf_object_info *objbuf;
971 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
972 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
973 node, near_mem_node, near_cpu_node);
980 static int __devinit sn_hwperf_misc_register_init(void)
984 if (!ia64_platform_is("sn2"))
990 * Register a dynamic misc device for hwperf ioctls. Platforms
991 * supporting hotplug will create /dev/sn_hwperf, else user
992 * can to look up the minor number in /proc/misc.
994 if ((e = misc_register(&sn_hwperf_dev)) != 0) {
995 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
996 "register misc device for \"%s\"\n", sn_hwperf_dev.name);
1002 device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
1003 EXPORT_SYMBOL(sn_hwperf_get_nearest_node);