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) 2004-2005 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/cpumask.h>
32 #include <linux/smp_lock.h>
33 #include <linux/nodemask.h>
34 #include <asm/processor.h>
35 #include <asm/topology.h>
37 #include <asm/semaphore.h>
38 #include <asm/segment.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>
47 static void *sn_hwperf_salheap
= NULL
;
48 static int sn_hwperf_obj_cnt
= 0;
49 static nasid_t sn_hwperf_master_nasid
= INVALID_NASID
;
50 static int sn_hwperf_init(void);
51 static DECLARE_MUTEX(sn_hwperf_init_mutex
);
53 static int sn_hwperf_enum_objects(int *nobj
, struct sn_hwperf_object_info
**ret
)
57 struct sn_hwperf_object_info
*objbuf
= NULL
;
59 if ((e
= sn_hwperf_init()) < 0) {
60 printk("sn_hwperf_init failed: err %d\n", e
);
64 sz
= sn_hwperf_obj_cnt
* sizeof(struct sn_hwperf_object_info
);
65 if ((objbuf
= (struct sn_hwperf_object_info
*) vmalloc(sz
)) == NULL
) {
66 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz
);
71 e
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
, SN_HWPERF_ENUM_OBJECTS
,
72 0, sz
, (u64
) objbuf
, 0, 0, NULL
);
73 if (e
!= SN_HWPERF_OP_OK
) {
79 *nobj
= sn_hwperf_obj_cnt
;
84 static int sn_hwperf_geoid_to_cnode(char *location
)
91 int this_rack
, this_slot
, this_slab
;
93 if (sscanf(location
, "%03d%c%02d#%d", &rack
, &type
, &slot
, &slab
) != 4)
96 for (cnode
= 0; cnode
< numionodes
; cnode
++) {
97 geoid
= cnodeid_get_geoid(cnode
);
98 module_id
= geo_module(geoid
);
99 this_rack
= MODULE_GET_RACK(module_id
);
100 this_slot
= MODULE_GET_BPOS(module_id
);
101 this_slab
= geo_slab(geoid
);
102 if (rack
== this_rack
&& slot
== this_slot
&& slab
== this_slab
)
106 return cnode
< numionodes
? cnode
: -1;
109 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info
* obj
)
111 if (!obj
->sn_hwp_this_part
)
113 return sn_hwperf_geoid_to_cnode(obj
->location
);
116 static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info
*obj
,
117 struct sn_hwperf_object_info
*objs
)
120 struct sn_hwperf_object_info
*p
;
122 for (ordinal
=0, p
=objs
; p
!= obj
; p
++) {
123 if (SN_HWPERF_FOREIGN(p
))
125 if (SN_HWPERF_SAME_OBJTYPE(p
, obj
))
132 static const char *slabname_node
= "node"; /* SHub asic */
133 static const char *slabname_ionode
= "ionode"; /* TIO asic */
134 static const char *slabname_router
= "router"; /* NL3R or NL4R */
135 static const char *slabname_other
= "other"; /* unknown asic */
137 static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info
*obj
,
138 struct sn_hwperf_object_info
*objs
, int *ordinal
)
141 const char *slabname
= slabname_other
;
143 if ((isnode
= SN_HWPERF_IS_NODE(obj
)) || SN_HWPERF_IS_IONODE(obj
)) {
144 slabname
= isnode
? slabname_node
: slabname_ionode
;
145 *ordinal
= sn_hwperf_obj_to_cnode(obj
);
148 *ordinal
= sn_hwperf_generic_ordinal(obj
, objs
);
149 if (SN_HWPERF_IS_ROUTER(obj
))
150 slabname
= slabname_router
;
156 static int sn_topology_show(struct seq_file
*s
, void *d
)
163 const char *slabname
;
167 struct cpuinfo_ia64
*c
;
168 struct sn_hwperf_port_info
*ptdata
;
169 struct sn_hwperf_object_info
*p
;
170 struct sn_hwperf_object_info
*obj
= d
; /* this object */
171 struct sn_hwperf_object_info
*objs
= s
->private; /* all objects */
174 seq_printf(s
, "# sn_topology version 1\n");
175 seq_printf(s
, "# objtype ordinal location partition"
176 " [attribute value [, ...]]\n");
179 if (SN_HWPERF_FOREIGN(obj
)) {
180 /* private in another partition: not interesting */
184 for (i
= 0; obj
->name
[i
]; i
++) {
185 if (obj
->name
[i
] == ' ')
189 slabname
= sn_hwperf_get_slabname(obj
, objs
, &ordinal
);
190 seq_printf(s
, "%s %d %s %s asic %s", slabname
, ordinal
, obj
->location
,
191 obj
->sn_hwp_this_part
? "local" : "shared", obj
->name
);
193 if (!SN_HWPERF_IS_NODE(obj
) && !SN_HWPERF_IS_IONODE(obj
))
196 seq_printf(s
, ", nasid 0x%x", cnodeid_to_nasid(ordinal
));
197 for (i
=0; i
< numionodes
; i
++) {
198 seq_printf(s
, i
? ":%d" : ", dist %d",
199 node_distance(ordinal
, i
));
204 * CPUs on this node, if any
206 cpumask
= node_to_cpumask(ordinal
);
207 for_each_online_cpu(i
) {
208 if (cpu_isset(i
, cpumask
)) {
209 slice
= 'a' + cpuid_to_slice(i
);
211 seq_printf(s
, "cpu %d %s%c local"
212 " freq %luMHz, arch ia64",
213 i
, obj
->location
, slice
,
214 c
->proc_freq
/ 1000000);
215 for_each_online_cpu(j
) {
216 seq_printf(s
, j
? ":%d" : ", dist %d",
219 cpuid_to_cnodeid(j
)));
230 sz
= obj
->ports
* sizeof(struct sn_hwperf_port_info
);
231 if ((ptdata
= vmalloc(sz
)) == NULL
)
233 e
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
,
234 SN_HWPERF_ENUM_PORTS
, obj
->id
, sz
,
235 (u64
) ptdata
, 0, 0, NULL
);
236 if (e
!= SN_HWPERF_OP_OK
)
238 for (ordinal
=0, p
=objs
; p
!= obj
; p
++) {
239 if (!SN_HWPERF_FOREIGN(p
))
242 for (pt
= 0; pt
< obj
->ports
; pt
++) {
243 for (p
= objs
, i
= 0; i
< sn_hwperf_obj_cnt
; i
++, p
++) {
244 if (ptdata
[pt
].conn_id
== p
->id
) {
248 seq_printf(s
, "numalink %d %s-%d",
249 ordinal
+pt
, obj
->location
, ptdata
[pt
].port
);
251 if (i
>= sn_hwperf_obj_cnt
) {
253 seq_puts(s
, " local endpoint disconnected"
254 ", protocol unknown\n");
258 if (obj
->sn_hwp_this_part
&& p
->sn_hwp_this_part
)
259 /* both ends local to this partition */
260 seq_puts(s
, " local");
261 else if (!obj
->sn_hwp_this_part
&& !p
->sn_hwp_this_part
)
262 /* both ends of the link in foreign partiton */
263 seq_puts(s
, " foreign");
265 /* link straddles a partition */
266 seq_puts(s
, " shared");
269 * Unlikely, but strictly should query the LLP config
270 * registers because an NL4R can be configured to run
271 * NL3 protocol, even when not talking to an NL3 router.
272 * Ditto for node-node.
274 seq_printf(s
, " endpoint %s-%d, protocol %s\n",
275 p
->location
, ptdata
[pt
].conn_port
,
276 (SN_HWPERF_IS_NL3ROUTER(obj
) ||
277 SN_HWPERF_IS_NL3ROUTER(p
)) ? "LLP3" : "LLP4");
285 static void *sn_topology_start(struct seq_file
*s
, loff_t
* pos
)
287 struct sn_hwperf_object_info
*objs
= s
->private;
289 if (*pos
< sn_hwperf_obj_cnt
)
290 return (void *)(objs
+ *pos
);
295 static void *sn_topology_next(struct seq_file
*s
, void *v
, loff_t
* pos
)
298 return sn_topology_start(s
, pos
);
301 static void sn_topology_stop(struct seq_file
*m
, void *v
)
307 * /proc/sgi_sn/sn_topology, read-only using seq_file
309 static struct seq_operations sn_topology_seq_ops
= {
310 .start
= sn_topology_start
,
311 .next
= sn_topology_next
,
312 .stop
= sn_topology_stop
,
313 .show
= sn_topology_show
316 struct sn_hwperf_op_info
{
318 struct sn_hwperf_ioctl_args
*a
;
324 static void sn_hwperf_call_sal(void *info
)
326 struct sn_hwperf_op_info
*op_info
= info
;
329 r
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
, op_info
->op
,
330 op_info
->a
->arg
, op_info
->a
->sz
,
331 (u64
) op_info
->p
, 0, 0, op_info
->v0
);
335 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info
*op_info
)
340 cpumask_t save_allowed
;
342 cpu
= (op_info
->a
->arg
& SN_HWPERF_ARG_CPU_MASK
) >> 32;
343 use_ipi
= op_info
->a
->arg
& SN_HWPERF_ARG_USE_IPI_MASK
;
344 op_info
->a
->arg
&= SN_HWPERF_ARG_OBJID_MASK
;
346 if (cpu
!= SN_HWPERF_ARG_ANY_CPU
) {
347 if (cpu
>= num_online_cpus() || !cpu_online(cpu
)) {
353 if (cpu
== SN_HWPERF_ARG_ANY_CPU
|| cpu
== get_cpu()) {
354 /* don't care, or already on correct cpu */
355 sn_hwperf_call_sal(op_info
);
359 /* use an interprocessor interrupt to call SAL */
360 smp_call_function_single(cpu
, sn_hwperf_call_sal
,
364 /* migrate the task before calling SAL */
365 save_allowed
= current
->cpus_allowed
;
366 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
367 sn_hwperf_call_sal(op_info
);
368 set_cpus_allowed(current
, save_allowed
);
377 /* map SAL hwperf error code to system error code */
378 static int sn_hwperf_map_err(int hwperf_err
)
383 case SN_HWPERF_OP_OK
:
387 case SN_HWPERF_OP_NOMEM
:
391 case SN_HWPERF_OP_NO_PERM
:
395 case SN_HWPERF_OP_IO_ERROR
:
399 case SN_HWPERF_OP_BUSY
:
400 case SN_HWPERF_OP_RECONFIGURE
:
404 case SN_HWPERF_OP_INVAL
:
414 * ioctl for "sn_hwperf" misc device
417 sn_hwperf_ioctl(struct inode
*in
, struct file
*fp
, u32 op
, u64 arg
)
419 struct sn_hwperf_ioctl_args a
;
420 struct cpuinfo_ia64
*cdata
;
421 struct sn_hwperf_object_info
*objs
;
422 struct sn_hwperf_object_info
*cpuobj
;
423 struct sn_hwperf_op_info op_info
;
435 /* only user requests are allowed here */
436 if ((op
& SN_HWPERF_OP_MASK
) < 10) {
440 r
= copy_from_user(&a
, (const void __user
*)arg
,
441 sizeof(struct sn_hwperf_ioctl_args
));
448 * Allocate memory to hold a kernel copy of the user buffer. The
449 * buffer contents are either copied in or out (or both) of user
450 * space depending on the flags encoded in the requested operation.
460 if (op
& SN_HWPERF_OP_MEM_COPYIN
) {
461 r
= copy_from_user(p
, (const void __user
*)a
.ptr
, a
.sz
);
469 case SN_HWPERF_GET_CPU_INFO
:
470 if (a
.sz
== sizeof(u64
)) {
471 /* special case to get size needed */
472 *(u64
*) p
= (u64
) num_online_cpus() *
473 sizeof(struct sn_hwperf_object_info
);
475 if (a
.sz
< num_online_cpus() * sizeof(struct sn_hwperf_object_info
)) {
479 if ((r
= sn_hwperf_enum_objects(&nobj
, &objs
)) == 0) {
481 for (i
= 0; i
< nobj
; i
++) {
482 node
= sn_hwperf_obj_to_cnode(objs
+ i
);
483 for_each_online_cpu(j
) {
484 if (node
!= cpu_to_node(j
))
486 cpuobj
= (struct sn_hwperf_object_info
*) p
+ j
;
487 slice
= 'a' + cpuid_to_slice(j
);
490 snprintf(cpuobj
->name
,
491 sizeof(cpuobj
->name
),
493 cdata
->proc_freq
/ 1000000,
495 snprintf(cpuobj
->location
,
496 sizeof(cpuobj
->location
),
497 "%s%c", objs
[i
].location
,
506 case SN_HWPERF_GET_NODE_NASID
:
507 if (a
.sz
!= sizeof(u64
) ||
508 (node
= a
.arg
) < 0 || node
>= numionodes
) {
512 *(u64
*)p
= (u64
)cnodeid_to_nasid(node
);
515 case SN_HWPERF_GET_OBJ_NODE
:
516 if (a
.sz
!= sizeof(u64
) || a
.arg
< 0) {
520 if ((r
= sn_hwperf_enum_objects(&nobj
, &objs
)) == 0) {
526 if (objs
[(i
= a
.arg
)].id
!= a
.arg
) {
527 for (i
= 0; i
< nobj
; i
++) {
528 if (objs
[i
].id
== a
.arg
)
537 *(u64
*)p
= (u64
)sn_hwperf_obj_to_cnode(objs
+ i
);
542 case SN_HWPERF_GET_MMRS
:
543 case SN_HWPERF_SET_MMRS
:
544 case SN_HWPERF_OBJECT_DISTANCE
:
549 r
= sn_hwperf_op_cpu(&op_info
);
551 r
= sn_hwperf_map_err(r
);
557 /* all other ops are a direct SAL call */
558 r
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
, op
,
559 a
.arg
, a
.sz
, (u64
) p
, 0, 0, &v0
);
561 r
= sn_hwperf_map_err(r
);
568 if (op
& SN_HWPERF_OP_MEM_COPYOUT
) {
569 r
= copy_to_user((void __user
*)a
.ptr
, p
, a
.sz
);
583 static struct file_operations sn_hwperf_fops
= {
584 .ioctl
= sn_hwperf_ioctl
,
587 static struct miscdevice sn_hwperf_dev
= {
593 static int sn_hwperf_init(void)
599 /* single threaded, once-only initialization */
600 down(&sn_hwperf_init_mutex
);
601 if (sn_hwperf_salheap
) {
602 up(&sn_hwperf_init_mutex
);
607 * The PROM code needs a fixed reference node. For convenience the
608 * same node as the console I/O is used.
610 sn_hwperf_master_nasid
= (nasid_t
) ia64_sn_get_console_nasid();
613 * Request the needed size and install the PROM scratch area.
614 * The PROM keeps various tracking bits in this memory area.
616 salr
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
,
617 (u64
) SN_HWPERF_GET_HEAPSIZE
, 0,
618 (u64
) sizeof(u64
), (u64
) &v
, 0, 0, NULL
);
619 if (salr
!= SN_HWPERF_OP_OK
) {
624 if ((sn_hwperf_salheap
= vmalloc(v
)) == NULL
) {
628 salr
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
,
629 SN_HWPERF_INSTALL_HEAP
, 0, v
,
630 (u64
) sn_hwperf_salheap
, 0, 0, NULL
);
631 if (salr
!= SN_HWPERF_OP_OK
) {
636 salr
= ia64_sn_hwperf_op(sn_hwperf_master_nasid
,
637 SN_HWPERF_OBJECT_COUNT
, 0,
638 sizeof(u64
), (u64
) &v
, 0, 0, NULL
);
639 if (salr
!= SN_HWPERF_OP_OK
) {
643 sn_hwperf_obj_cnt
= (int)v
;
646 if (e
< 0 && sn_hwperf_salheap
) {
647 vfree(sn_hwperf_salheap
);
648 sn_hwperf_salheap
= NULL
;
649 sn_hwperf_obj_cnt
= 0;
654 * Register a dynamic misc device for ioctl. Platforms
655 * supporting hotplug will create /dev/sn_hwperf, else
656 * user can to look up the minor number in /proc/misc.
658 if ((e
= misc_register(&sn_hwperf_dev
)) != 0) {
659 printk(KERN_ERR
"sn_hwperf_init: misc register "
660 "for \"sn_hwperf\" failed, err %d\n", e
);
664 up(&sn_hwperf_init_mutex
);
668 int sn_topology_open(struct inode
*inode
, struct file
*file
)
671 struct seq_file
*seq
;
672 struct sn_hwperf_object_info
*objbuf
;
675 if ((e
= sn_hwperf_enum_objects(&nobj
, &objbuf
)) == 0) {
676 e
= seq_open(file
, &sn_topology_seq_ops
);
677 seq
= file
->private_data
;
678 seq
->private = objbuf
;
684 int sn_topology_release(struct inode
*inode
, struct file
*file
)
686 struct seq_file
*seq
= file
->private_data
;
689 return seq_release(inode
, file
);