sn_hwperf.c

linux 内核源代码

/* 
 * 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) 2004-2006 Silicon Graphics, Inc. All rights reserved.
 *
 * SGI Altix topology and hardware performance monitoring API.
 * Mark Goodwin <[e-mail]>. 
 *
 * 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 <linux/fs.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/seq_file.h>
#include <linux/miscdevice.h>
#include <linux/utsname.h>
#include <linux/cpumask.h>
#include <linux/smp_lock.h>
#include <linux/nodemask.h>
#include <linux/smp.h>

#include <asm/processor.h>
#include <asm/topology.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <asm/sal.h>
#include <asm/sn/io.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/module.h>
#include <asm/sn/geo.h>
#include <asm/sn/sn2/sn_hwperf.h>
#include <asm/sn/addrs.h>

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);

#define cnode_possible(n)	((n) < num_cnodes)

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);
	objbuf = vmalloc(sz);
	if (objbuf == 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;

	/*
	 * FIXME: replace with cleaner for_each_XXX macro which addresses
	 * both compute and IO nodes once ACPI3.0 is available.
	 */
	for (cnode = 0; cnode < num_cnodes; 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 cnode_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 (SN_HWPERF_FOREIGN(obj))
		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 = 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 < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
}

static inline int sn_hwperf_has_mem(cnodeid_t node)
{
	return node < MAX_NUMNODES && 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 (!cnode_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_IS_ROUTER(dest))
			router = dest;
		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 (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, &region_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, 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 (ordinal < 0 || (!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
		 */
		if (!SN_HWPERF_IS_IONODE(obj)) {
			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 = kmalloc(sz, GFP_KERNEL)) == NULL)
			return -ENOMEM;
		e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,