[mirror_spl-debian.git] / module / spl / spl-kstat.c

/*****************************************************************************\
 *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
 *  Copyright (C) 2007 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
 *  UCRL-CODE-235197
 *
 *  This file is part of the SPL, Solaris Porting Layer.
 *  For details, see <http://github.com/behlendorf/spl/>.
 *
 *  The SPL is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  The SPL is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
 *****************************************************************************
 *  Solaris Porting Layer (SPL) Kstat Implementation.
\*****************************************************************************/

#include <linux/seq_file.h>
#include <sys/kstat.h>
#include <spl-debug.h>

#ifdef SS_DEBUG_SUBSYS
#undef SS_DEBUG_SUBSYS
#endif

#define SS_DEBUG_SUBSYS SS_KSTAT

static spinlock_t kstat_lock;
static struct list_head kstat_list;
static kid_t kstat_id;

static void
kstat_seq_show_headers(struct seq_file *f)
{
        kstat_t *ksp = (kstat_t *)f->private;
        ASSERT(ksp->ks_magic == KS_MAGIC);

        seq_printf(f, "%d %d 0x%02x %d %d %lld %lld\n",
		   ksp->ks_kid, ksp->ks_type, ksp->ks_flags,
		   ksp->ks_ndata, (int)ksp->ks_data_size,
		   ksp->ks_crtime, ksp->ks_snaptime);

	switch (ksp->ks_type) {
                case KSTAT_TYPE_RAW:
                        seq_printf(f, "raw data");
                        break;
                case KSTAT_TYPE_NAMED:
                        seq_printf(f, "%-31s %-4s %s\n",
                                   "name", "type", "data");
                        break;
                case KSTAT_TYPE_INTR:
                        seq_printf(f, "%-8s %-8s %-8s %-8s %-8s\n",
                                   "hard", "soft", "watchdog",
                                   "spurious", "multsvc");
                        break;
                case KSTAT_TYPE_IO:
                        seq_printf(f,
                                   "%-8s %-8s %-8s %-8s %-8s %-8s "
                                   "%-8s %-8s %-8s %-8s %-8s %-8s\n",
                                   "nread", "nwritten", "reads", "writes",
                                   "wtime", "wlentime", "wupdate",
                                   "rtime", "rlentime", "rupdate",
                                   "wcnt", "rcnt");
                        break;
                case KSTAT_TYPE_TIMER:
                        seq_printf(f,
                                   "%-31s %-8s "
                                   "%-8s %-8s %-8s %-8s %-8s\n",
                                   "name", "events", "elapsed",
                                   "min", "max", "start", "stop");
                        break;
                default:
                        PANIC("Undefined kstat type %d\n", ksp->ks_type);
        }
}

static int
kstat_seq_show_raw(struct seq_file *f, unsigned char *p, int l)
{
        int i, j;

        for (i = 0; ; i++) {
                seq_printf(f, "%03x:", i);

                for (j = 0; j < 16; j++) {
                        if (i * 16 + j >= l) {
                                seq_printf(f, "\n");
                                goto out;
                        }

                        seq_printf(f, " %02x", (unsigned char)p[i * 16 + j]);
                }
                seq_printf(f, "\n");
        }
out:
        return 0;
}

static int
kstat_seq_show_named(struct seq_file *f, kstat_named_t *knp)
{
        seq_printf(f, "%-31s %-4d ", knp->name, knp->data_type);

        switch (knp->data_type) {
                case KSTAT_DATA_CHAR:
                        knp->value.c[15] = '\0'; /* NULL terminate */
                        seq_printf(f, "%-16s", knp->value.c);
                        break;
                /* XXX - We need to be more careful able what tokens are
                 * used for each arch, for now this is correct for x86_64.
                 */
                case KSTAT_DATA_INT32:
                        seq_printf(f, "%d", knp->value.i32);
                        break;
                case KSTAT_DATA_UINT32:
                        seq_printf(f, "%u", knp->value.ui32);
                        break;
                case KSTAT_DATA_INT64:
                        seq_printf(f, "%lld", (signed long long)knp->value.i64);
                        break;
                case KSTAT_DATA_UINT64:
                        seq_printf(f, "%llu", (unsigned long long)knp->value.ui64);
                        break;
                case KSTAT_DATA_LONG:
                        seq_printf(f, "%ld", knp->value.l);
                        break;
                case KSTAT_DATA_ULONG:
                        seq_printf(f, "%lu", knp->value.ul);
                        break;
                case KSTAT_DATA_STRING:
                        KSTAT_NAMED_STR_PTR(knp)
                                [KSTAT_NAMED_STR_BUFLEN(knp)-1] = '\0';
                        seq_printf(f, "%s", KSTAT_NAMED_STR_PTR(knp));
                        break;
                default:
                        PANIC("Undefined kstat data type %d\n", knp->data_type);
        }

        seq_printf(f, "\n");

        return 0;
}

static int
kstat_seq_show_intr(struct seq_file *f, kstat_intr_t *kip)
{
        seq_printf(f, "%-8u %-8u %-8u %-8u %-8u\n",
                   kip->intrs[KSTAT_INTR_HARD],
                   kip->intrs[KSTAT_INTR_SOFT],
                   kip->intrs[KSTAT_INTR_WATCHDOG],
                   kip->intrs[KSTAT_INTR_SPURIOUS],
                   kip->intrs[KSTAT_INTR_MULTSVC]);

        return 0;
}

static int
kstat_seq_show_io(struct seq_file *f, kstat_io_t *kip)
{
        seq_printf(f,
                   "%-8llu %-8llu %-8u %-8u %-8lld %-8lld "
                   "%-8lld %-8lld %-8lld %-8lld %-8u %-8u\n",
                   kip->nread, kip->nwritten,
                   kip->reads, kip->writes,
                   kip->wtime, kip->wlentime, kip->wlastupdate,
                   kip->rtime, kip->wlentime, kip->rlastupdate,
                   kip->wcnt,  kip->rcnt);

        return 0;
}

static int
kstat_seq_show_timer(struct seq_file *f, kstat_timer_t *ktp)
{
        seq_printf(f,
                   "%-31s %-8llu %-8lld %-8lld %-8lld %-8lld %-8lld\n",
                   ktp->name, ktp->num_events, ktp->elapsed_time,
                   ktp->min_time, ktp->max_time,
                   ktp->start_time, ktp->stop_time);

        return 0;
}

static int
kstat_seq_show(struct seq_file *f, void *p)
{
        kstat_t *ksp = (kstat_t *)f->private;
        int rc = 0;

        ASSERT(ksp->ks_magic == KS_MAGIC);

	switch (ksp->ks_type) {
                case KSTAT_TYPE_RAW:
                        ASSERT(ksp->ks_ndata == 1);
                        rc = kstat_seq_show_raw(f, ksp->ks_data,
                                                ksp->ks_data_size);
                        break;
                case KSTAT_TYPE_NAMED:
                        rc = kstat_seq_show_named(f, (kstat_named_t *)p);
                        break;
                case KSTAT_TYPE_INTR:
                        rc = kstat_seq_show_intr(f, (kstat_intr_t *)p);
                        break;
                case KSTAT_TYPE_IO:
                        rc = kstat_seq_show_io(f, (kstat_io_t *)p);
                        break;
                case KSTAT_TYPE_TIMER:
                        rc = kstat_seq_show_timer(f, (kstat_timer_t *)p);
                        break;
                default:
                        PANIC("Undefined kstat type %d\n", ksp->ks_type);
        }

        return rc;
}

static void *
kstat_seq_data_addr(kstat_t *ksp, loff_t n)
{
        void *rc = NULL;
        SENTRY;

	switch (ksp->ks_type) {
                case KSTAT_TYPE_RAW:
	                rc = ksp->ks_data;
                        break;
                case KSTAT_TYPE_NAMED:
                        rc = ksp->ks_data + n * sizeof(kstat_named_t);
                        break;
                case KSTAT_TYPE_INTR:
                        rc = ksp->ks_data + n * sizeof(kstat_intr_t);
                        break;
                case KSTAT_TYPE_IO:
                        rc = ksp->ks_data + n * sizeof(kstat_io_t);
                        break;
                case KSTAT_TYPE_TIMER:
                        rc = ksp->ks_data + n * sizeof(kstat_timer_t);
                        break;
                default:
                        PANIC("Undefined kstat type %d\n", ksp->ks_type);
        }

        SRETURN(rc);
}

static void *
kstat_seq_start(struct seq_file *f, loff_t *pos)
{
        loff_t n = *pos;
        kstat_t *ksp = (kstat_t *)f->private;
        ASSERT(ksp->ks_magic == KS_MAGIC);
        SENTRY;

        spin_lock(&ksp->ks_lock);
	ksp->ks_snaptime = gethrtime();

        if (!n)
                kstat_seq_show_headers(f);

        if (n >= ksp->ks_ndata)
                SRETURN(NULL);

        SRETURN(kstat_seq_data_addr(ksp, n));
}

static void *
kstat_seq_next(struct seq_file *f, void *p, loff_t *pos)
{
        kstat_t *ksp = (kstat_t *)f->private;
        ASSERT(ksp->ks_magic == KS_MAGIC);
        SENTRY;

        ++*pos;
        if (*pos >= ksp->ks_ndata)
                SRETURN(NULL);

        SRETURN(kstat_seq_data_addr(ksp, *pos));
}

static void
kstat_seq_stop(struct seq_file *f, void *v)
{
        kstat_t *ksp = (kstat_t *)f->private;
        ASSERT(ksp->ks_magic == KS_MAGIC);

        spin_unlock(&ksp->ks_lock);
}

static struct seq_operations kstat_seq_ops = {
        .show  = kstat_seq_show,
        .start = kstat_seq_start,
        .next  = kstat_seq_next,
        .stop  = kstat_seq_stop,
};

static int
proc_kstat_open(struct inode *inode, struct file *filp)
{
        struct seq_file *f;
        int rc;

        rc = seq_open(filp, &kstat_seq_ops);
        if (rc)
                return rc;

        f = filp->private_data;
        f->private = PDE(inode)->data;

        return rc;
}

static struct file_operations proc_kstat_operations = {
        .open           = proc_kstat_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = seq_release,
};

kstat_t *
__kstat_create(const char *ks_module, int ks_instance, const char *ks_name,
             const char *ks_class, uchar_t ks_type, uint_t ks_ndata,
             uchar_t ks_flags)
{
	kstat_t *ksp;

	ASSERT(ks_module);
	ASSERT(ks_instance == 0);
	ASSERT(ks_name);
	ASSERT(!(ks_flags & KSTAT_FLAG_UNSUPPORTED));

	if ((ks_type == KSTAT_TYPE_INTR) || (ks_type == KSTAT_TYPE_IO))
                ASSERT(ks_ndata == 1);

	ksp = kmem_zalloc(sizeof(*ksp), KM_SLEEP);
	if (ksp == NULL)
		return ksp;

	spin_lock(&kstat_lock);
	ksp->ks_kid = kstat_id;
        kstat_id++;
	spin_unlock(&kstat_lock);

        ksp->ks_magic = KS_MAGIC;
	spin_lock_init(&ksp->ks_lock);
	INIT_LIST_HEAD(&ksp->ks_list);

	ksp->ks_crtime = gethrtime();
        ksp->ks_snaptime = ksp->ks_crtime;
	strncpy(ksp->ks_module, ks_module, KSTAT_STRLEN);
	ksp->ks_instance = ks_instance;
	strncpy(ksp->ks_name, ks_name, KSTAT_STRLEN);
	strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN);
	ksp->ks_type = ks_type;
	ksp->ks_flags = ks_flags;

	switch (ksp->ks_type) {
                case KSTAT_TYPE_RAW:
	                ksp->ks_ndata = 1;
                        ksp->ks_data_size = ks_ndata;
                        break;
                case KSTAT_TYPE_NAMED:
	                ksp->ks_ndata = ks_ndata;
                        ksp->ks_data_size = ks_ndata * sizeof(kstat_named_t);
                        break;
                case KSTAT_TYPE_INTR:
	                ksp->ks_ndata = ks_ndata;
                        ksp->ks_data_size = ks_ndata * sizeof(kstat_intr_t);
                        break;
                case KSTAT_TYPE_IO:
	                ksp->ks_ndata = ks_ndata;
                        ksp->ks_data_size = ks_ndata * sizeof(kstat_io_t);
                        break;
                case KSTAT_TYPE_TIMER:
	                ksp->ks_ndata = ks_ndata;
                        ksp->ks_data_size = ks_ndata * sizeof(kstat_timer_t);
                        break;
                default:
                        PANIC("Undefined kstat type %d\n", ksp->ks_type);
        }

	if (ksp->ks_flags & KSTAT_FLAG_VIRTUAL) {
                ksp->ks_data = NULL;
        } else {
                ksp->ks_data = kmem_alloc(ksp->ks_data_size, KM_SLEEP);
                if (ksp->ks_data == NULL) {
                        kmem_free(ksp, sizeof(*ksp));
                        ksp = NULL;
                }
        }

	return ksp;
}
EXPORT_SYMBOL(__kstat_create);

void
__kstat_install(kstat_t *ksp)
{
	struct proc_dir_entry *de_module, *de_name;
	kstat_t *tmp;
	int rc = 0;
	SENTRY;

	spin_lock(&kstat_lock);

	/* Item may only be added to the list once */
        list_for_each_entry(tmp, &kstat_list, ks_list) {
                if (tmp == ksp) {
		        spin_unlock(&kstat_lock);
			SGOTO(out, rc = -EEXIST);
		}
	}

        list_add_tail(&ksp->ks_list, &kstat_list);
	spin_unlock(&kstat_lock);

	de_module = proc_dir_entry_find(proc_spl_kstat, ksp->ks_module);
	if (de_module == NULL) {
                de_module = proc_mkdir(ksp->ks_module, proc_spl_kstat);
		if (de_module == NULL)
			SGOTO(out, rc = -EUNATCH);
	}

	de_name = create_proc_entry(ksp->ks_name, 0444, de_module);
	if (de_name == NULL)
		SGOTO(out, rc = -EUNATCH);

	spin_lock(&ksp->ks_lock);
	ksp->ks_proc = de_name;
	de_name->proc_fops = &proc_kstat_operations;
        de_name->data = (void *)ksp;
	spin_unlock(&ksp->ks_lock);
out:
	if (rc) {
		spin_lock(&kstat_lock);
	        list_del_init(&ksp->ks_list);
		spin_unlock(&kstat_lock);
	}

	SEXIT;
}
EXPORT_SYMBOL(__kstat_install);

void
__kstat_delete(kstat_t *ksp)
{
	struct proc_dir_entry *de_module;

	spin_lock(&kstat_lock);
        list_del_init(&ksp->ks_list);
	spin_unlock(&kstat_lock);

        if (ksp->ks_proc) {
	        de_module = ksp->ks_proc->parent;
	        remove_proc_entry(ksp->ks_name, de_module);

	        /* Remove top level module directory if it's empty */
	        if (proc_dir_entries(de_module) == 0)
		        remove_proc_entry(de_module->name, de_module->parent);
	}

	if (!(ksp->ks_flags & KSTAT_FLAG_VIRTUAL))
                kmem_free(ksp->ks_data, ksp->ks_data_size);

	kmem_free(ksp, sizeof(*ksp));

	return;
}
EXPORT_SYMBOL(__kstat_delete);

int
kstat_init(void)
{
	SENTRY;
	spin_lock_init(&kstat_lock);
	INIT_LIST_HEAD(&kstat_list);
        kstat_id = 0;
	SRETURN(0);
}

void
kstat_fini(void)
{
	SENTRY;
	ASSERT(list_empty(&kstat_list));
	SEXIT;
}
Commit	Line	Data
716154c5 BB	1	/*****************************************************************************\
	2	* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
	3	* Copyright (C) 2007 The Regents of the University of California.
	4	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	5	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
715f6251	6	* UCRL-CODE-235197
715f6251	7	*
716154c5 BB	8	* This file is part of the SPL, Solaris Porting Layer.
	9	* For details, see <http://github.com/behlendorf/spl/>.
	10	*
	11	* The SPL is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
715f6251	15	*
716154c5	16	* The SPL is distributed in the hope that it will be useful, but WITHOUT
715f6251	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	19	* for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along
716154c5 BB	22	* with the SPL. If not, see <http://www.gnu.org/licenses/>.
	23	*****************************************************************************
	24	* Solaris Porting Layer (SPL) Kstat Implementation.
	25	\*****************************************************************************/
715f6251	26
ae4c36ad	27	#include <linux/seq_file.h>
55abb092 BB	28	#include <sys/kstat.h>
55abb092 BB	29	#include <spl-debug.h>
04a479f7	30
b17edc10 BB	31	#ifdef SS_DEBUG_SUBSYS
	32	#undef SS_DEBUG_SUBSYS
	33	#endif
	34
	35	#define SS_DEBUG_SUBSYS SS_KSTAT
	36
04a479f7	37	static spinlock_t kstat_lock;
	38	static struct list_head kstat_list;
	39	static kid_t kstat_id;
	40
	41	static void
	42	kstat_seq_show_headers(struct seq_file *f)
	43	{
	44	kstat_t ksp = (kstat_t )f->private;
	45	ASSERT(ksp->ks_magic == KS_MAGIC);
	46
	47	seq_printf(f, "%d %d 0x%02x %d %d %lld %lld\n",
	48	ksp->ks_kid, ksp->ks_type, ksp->ks_flags,
	49	ksp->ks_ndata, (int)ksp->ks_data_size,
	50	ksp->ks_crtime, ksp->ks_snaptime);
	51
	52	switch (ksp->ks_type) {
	53	case KSTAT_TYPE_RAW:
	54	seq_printf(f, "raw data");
	55	break;
	56	case KSTAT_TYPE_NAMED:
	57	seq_printf(f, "%-31s %-4s %s\n",
	58	"name", "type", "data");
	59	break;
	60	case KSTAT_TYPE_INTR:
	61	seq_printf(f, "%-8s %-8s %-8s %-8s %-8s\n",
	62	"hard", "soft", "watchdog",
	63	"spurious", "multsvc");
	64	break;
	65	case KSTAT_TYPE_IO:
	66	seq_printf(f,
	67	"%-8s %-8s %-8s %-8s %-8s %-8s "
	68	"%-8s %-8s %-8s %-8s %-8s %-8s\n",
	69	"nread", "nwritten", "reads", "writes",
	70	"wtime", "wlentime", "wupdate",
	71	"rtime", "rlentime", "rupdate",
	72	"wcnt", "rcnt");
	73	break;
	74	case KSTAT_TYPE_TIMER:
	75	seq_printf(f,
	76	"%-31s %-8s "
	77	"%-8s %-8s %-8s %-8s %-8s\n",
	78	"name", "events", "elapsed",
	79	"min", "max", "start", "stop");
	80	break;
	81	default:
55abb092	82	PANIC("Undefined kstat type %d\n", ksp->ks_type);
04a479f7	83	}
	84	}
	85
	86	static int
	87	kstat_seq_show_raw(struct seq_file f, unsigned char p, int l)
	88	{
	89	int i, j;
	90
	91	for (i = 0; ; i++) {
	92	seq_printf(f, "%03x:", i);
	93
	94	for (j = 0; j < 16; j++) {
	95	if (i * 16 + j >= l) {
	96	seq_printf(f, "\n");
	97	goto out;
	98	}
	99
	100	seq_printf(f, " %02x", (unsigned char)p[i * 16 + j]);
	101	}
	102	seq_printf(f, "\n");
	103	}
	104	out:
	105	return 0;
	106	}
	107
	108	static int
	109	kstat_seq_show_named(struct seq_file f, kstat_named_t knp)
	110	{
	111	seq_printf(f, "%-31s %-4d ", knp->name, knp->data_type);
	112
	113	switch (knp->data_type) {
	114	case KSTAT_DATA_CHAR:
	115	knp->value.c[15] = '\0'; /* NULL terminate */
	116	seq_printf(f, "%-16s", knp->value.c);
	117	break;
	118	/* XXX - We need to be more careful able what tokens are
	119	* used for each arch, for now this is correct for x86_64.
	120	*/
	121	case KSTAT_DATA_INT32:
	122	seq_printf(f, "%d", knp->value.i32);
	123	break;
	124	case KSTAT_DATA_UINT32:
	125	seq_printf(f, "%u", knp->value.ui32);
	126	break;
	127	case KSTAT_DATA_INT64:
cfe57499	128	seq_printf(f, "%lld", (signed long long)knp->value.i64);
04a479f7	129	break;
04a479f7	130	case KSTAT_DATA_UINT64:
cfe57499	131	seq_printf(f, "%llu", (unsigned long long)knp->value.ui64);
04a479f7	132	break;
	133	case KSTAT_DATA_LONG:
	134	seq_printf(f, "%ld", knp->value.l);
	135	break;
	136	case KSTAT_DATA_ULONG:
cfe57499	137	seq_printf(f, "%lu", knp->value.ul);
04a479f7	138	break;
	139	case KSTAT_DATA_STRING:
	140	KSTAT_NAMED_STR_PTR(knp)
	141	[KSTAT_NAMED_STR_BUFLEN(knp)-1] = '\0';
	142	seq_printf(f, "%s", KSTAT_NAMED_STR_PTR(knp));
	143	break;
	144	default:
55abb092	145	PANIC("Undefined kstat data type %d\n", knp->data_type);
04a479f7	146	}
	147
	148	seq_printf(f, "\n");
	149
	150	return 0;
	151	}
	152
	153	static int
	154	kstat_seq_show_intr(struct seq_file f, kstat_intr_t kip)
	155	{
	156	seq_printf(f, "%-8u %-8u %-8u %-8u %-8u\n",
	157	kip->intrs[KSTAT_INTR_HARD],
	158	kip->intrs[KSTAT_INTR_SOFT],
	159	kip->intrs[KSTAT_INTR_WATCHDOG],
	160	kip->intrs[KSTAT_INTR_SPURIOUS],
	161	kip->intrs[KSTAT_INTR_MULTSVC]);
	162
	163	return 0;
	164	}
	165
	166	static int
	167	kstat_seq_show_io(struct seq_file f, kstat_io_t kip)
	168	{
	169	seq_printf(f,
	170	"%-8llu %-8llu %-8u %-8u %-8lld %-8lld "
	171	"%-8lld %-8lld %-8lld %-8lld %-8u %-8u\n",
	172	kip->nread, kip->nwritten,
	173	kip->reads, kip->writes,
	174	kip->wtime, kip->wlentime, kip->wlastupdate,
	175	kip->rtime, kip->wlentime, kip->rlastupdate,
	176	kip->wcnt, kip->rcnt);
	177
	178	return 0;
	179	}
	180
	181	static int
	182	kstat_seq_show_timer(struct seq_file f, kstat_timer_t ktp)
	183	{
	184	seq_printf(f,
	185	"%-31s %-8llu %-8lld %-8lld %-8lld %-8lld %-8lld\n",
	186	ktp->name, ktp->num_events, ktp->elapsed_time,
	187	ktp->min_time, ktp->max_time,
	188	ktp->start_time, ktp->stop_time);
	189
	190	return 0;
	191	}
	192
	193	static int
	194	kstat_seq_show(struct seq_file f, void p)
	195	{
	196	kstat_t ksp = (kstat_t )f->private;
	197	int rc = 0;
	198
	199	ASSERT(ksp->ks_magic == KS_MAGIC);
	200
	201	switch (ksp->ks_type) {
	202	case KSTAT_TYPE_RAW:
	203	ASSERT(ksp->ks_ndata == 1);
	204	rc = kstat_seq_show_raw(f, ksp->ks_data,
	205	ksp->ks_data_size);
	206	break;
	207	case KSTAT_TYPE_NAMED:
	208	rc = kstat_seq_show_named(f, (kstat_named_t *)p);
	209	break;
210	case KSTAT_TYPE_INTR:
211	rc = kstat_seq_show_intr(f, (kstat_intr_t *)p);
212	break;
213	case KSTAT_TYPE_IO:
214	rc = kstat_seq_show_io(f, (kstat_io_t *)p);
215	break;
216	case KSTAT_TYPE_TIMER:
217	rc = kstat_seq_show_timer(f, (kstat_timer_t *)p);
218	break;
219	default:
55abb092	220	PANIC("Undefined kstat type %d\n", ksp->ks_type);
04a479f7	221	}
	222
	223	return rc;
	224	}
	225
	226	static void *
	227	kstat_seq_data_addr(kstat_t *ksp, loff_t n)
	228	{
	229	void *rc = NULL;
b17edc10	230	SENTRY;
04a479f7	231
	232	switch (ksp->ks_type) {
	233	case KSTAT_TYPE_RAW:
	234	rc = ksp->ks_data;
	235	break;
	236	case KSTAT_TYPE_NAMED:
	237	rc = ksp->ks_data + n * sizeof(kstat_named_t);
	238	break;
	239	case KSTAT_TYPE_INTR:
	240	rc = ksp->ks_data + n * sizeof(kstat_intr_t);
	241	break;
	242	case KSTAT_TYPE_IO:
	243	rc = ksp->ks_data + n * sizeof(kstat_io_t);
	244	break;
	245	case KSTAT_TYPE_TIMER:
	246	rc = ksp->ks_data + n * sizeof(kstat_timer_t);
	247	break;
	248	default:
55abb092	249	PANIC("Undefined kstat type %d\n", ksp->ks_type);
04a479f7	250	}
04a479f7	251
b17edc10	252	SRETURN(rc);
04a479f7	253	}
	254
	255	static void *
	256	kstat_seq_start(struct seq_file f, loff_t pos)
	257	{
	258	loff_t n = *pos;
	259	kstat_t ksp = (kstat_t )f->private;
	260	ASSERT(ksp->ks_magic == KS_MAGIC);
b17edc10	261	SENTRY;
04a479f7	262
	263	spin_lock(&ksp->ks_lock);
	264	ksp->ks_snaptime = gethrtime();
	265
	266	if (!n)
	267	kstat_seq_show_headers(f);
	268
	269	if (n >= ksp->ks_ndata)
b17edc10	270	SRETURN(NULL);
04a479f7	271
b17edc10	272	SRETURN(kstat_seq_data_addr(ksp, n));
04a479f7	273	}
	274
	275	static void *
	276	kstat_seq_next(struct seq_file f, void p, loff_t *pos)
	277	{
	278	kstat_t ksp = (kstat_t )f->private;
	279	ASSERT(ksp->ks_magic == KS_MAGIC);
b17edc10	280	SENTRY;
04a479f7	281
	282	++*pos;
	283	if (*pos >= ksp->ks_ndata)
b17edc10	284	SRETURN(NULL);
04a479f7	285
b17edc10	286	SRETURN(kstat_seq_data_addr(ksp, *pos));
04a479f7	287	}
	288
	289	static void
	290	kstat_seq_stop(struct seq_file f, void v)
	291	{
	292	kstat_t ksp = (kstat_t )f->private;
	293	ASSERT(ksp->ks_magic == KS_MAGIC);
	294
	295	spin_unlock(&ksp->ks_lock);
	296	}
	297
	298	static struct seq_operations kstat_seq_ops = {
	299	.show = kstat_seq_show,
	300	.start = kstat_seq_start,
	301	.next = kstat_seq_next,
	302	.stop = kstat_seq_stop,
	303	};
	304
	305	static int
	306	proc_kstat_open(struct inode inode, struct file filp)
	307	{
	308	struct seq_file *f;
	309	int rc;
	310
	311	rc = seq_open(filp, &kstat_seq_ops);
	312	if (rc)
	313	return rc;
	314
	315	f = filp->private_data;
	316	f->private = PDE(inode)->data;
	317
	318	return rc;
	319	}
	320
	321	static struct file_operations proc_kstat_operations = {
	322	.open = proc_kstat_open,
	323	.read = seq_read,
	324	.llseek = seq_lseek,
	325	.release = seq_release,
	326	};
	327
	328	kstat_t *
	329	__kstat_create(const char ks_module, int ks_instance, const char ks_name,
	330	const char *ks_class, uchar_t ks_type, uint_t ks_ndata,
	331	uchar_t ks_flags)
	332	{
	333	kstat_t *ksp;
	334
	335	ASSERT(ks_module);
	336	ASSERT(ks_instance == 0);
	337	ASSERT(ks_name);
	338	ASSERT(!(ks_flags & KSTAT_FLAG_UNSUPPORTED));
	339
	340	if ((ks_type == KSTAT_TYPE_INTR) \|\| (ks_type == KSTAT_TYPE_IO))
	341	ASSERT(ks_ndata == 1);
	342
	343	ksp = kmem_zalloc(sizeof(*ksp), KM_SLEEP);
	344	if (ksp == NULL)
	345	return ksp;
	346
	347	spin_lock(&kstat_lock);
	348	ksp->ks_kid = kstat_id;
	349	kstat_id++;
	350	spin_unlock(&kstat_lock);
351
352	ksp->ks_magic = KS_MAGIC;
353	spin_lock_init(&ksp->ks_lock);
354	INIT_LIST_HEAD(&ksp->ks_list);
355
356	ksp->ks_crtime = gethrtime();
357	ksp->ks_snaptime = ksp->ks_crtime;
358	strncpy(ksp->ks_module, ks_module, KSTAT_STRLEN);
359	ksp->ks_instance = ks_instance;
360	strncpy(ksp->ks_name, ks_name, KSTAT_STRLEN);
361	strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN);
362	ksp->ks_type = ks_type;
363	ksp->ks_flags = ks_flags;
364
365	switch (ksp->ks_type) {
366	case KSTAT_TYPE_RAW:
367	ksp->ks_ndata = 1;
368	ksp->ks_data_size = ks_ndata;
369	break;
370	case KSTAT_TYPE_NAMED:
371	ksp->ks_ndata = ks_ndata;
372	ksp->ks_data_size = ks_ndata * sizeof(kstat_named_t);
373	break;
374	case KSTAT_TYPE_INTR:
375	ksp->ks_ndata = ks_ndata;
376	ksp->ks_data_size = ks_ndata * sizeof(kstat_intr_t);
377	break;
378	case KSTAT_TYPE_IO:
379	ksp->ks_ndata = ks_ndata;
380	ksp->ks_data_size = ks_ndata * sizeof(kstat_io_t);
381	break;
382	case KSTAT_TYPE_TIMER:
383	ksp->ks_ndata = ks_ndata;
384	ksp->ks_data_size = ks_ndata * sizeof(kstat_timer_t);
385	break;
386	default:
55abb092	387	PANIC("Undefined kstat type %d\n", ksp->ks_type);
04a479f7	388	}
	389
	390	if (ksp->ks_flags & KSTAT_FLAG_VIRTUAL) {
	391	ksp->ks_data = NULL;
	392	} else {
	393	ksp->ks_data = kmem_alloc(ksp->ks_data_size, KM_SLEEP);
	394	if (ksp->ks_data == NULL) {
	395	kmem_free(ksp, sizeof(*ksp));
	396	ksp = NULL;
	397	}
	398	}
	399
	400	return ksp;
	401	}
	402	EXPORT_SYMBOL(__kstat_create);
	403
	404	void
	405	__kstat_install(kstat_t *ksp)
	406	{
	407	struct proc_dir_entry de_module, de_name;
	408	kstat_t *tmp;
	409	int rc = 0;
b17edc10	410	SENTRY;
04a479f7	411
	412	spin_lock(&kstat_lock);
	413
	414	/* Item may only be added to the list once */
	415	list_for_each_entry(tmp, &kstat_list, ks_list) {
	416	if (tmp == ksp) {
	417	spin_unlock(&kstat_lock);
b17edc10	418	SGOTO(out, rc = -EEXIST);
04a479f7	419	}
	420	}
	421
	422	list_add_tail(&ksp->ks_list, &kstat_list);
	423	spin_unlock(&kstat_lock);
	424
c30df9c8	425	de_module = proc_dir_entry_find(proc_spl_kstat, ksp->ks_module);
04a479f7	426	if (de_module == NULL) {
c30df9c8	427	de_module = proc_mkdir(ksp->ks_module, proc_spl_kstat);
04a479f7	428	if (de_module == NULL)
b17edc10	429	SGOTO(out, rc = -EUNATCH);
04a479f7	430	}
	431
	432	de_name = create_proc_entry(ksp->ks_name, 0444, de_module);
	433	if (de_name == NULL)
b17edc10	434	SGOTO(out, rc = -EUNATCH);
04a479f7	435
	436	spin_lock(&ksp->ks_lock);
	437	ksp->ks_proc = de_name;
	438	de_name->proc_fops = &proc_kstat_operations;
	439	de_name->data = (void *)ksp;
	440	spin_unlock(&ksp->ks_lock);
	441	out:
	442	if (rc) {
	443	spin_lock(&kstat_lock);
	444	list_del_init(&ksp->ks_list);
	445	spin_unlock(&kstat_lock);
	446	}
	447
b17edc10	448	SEXIT;
04a479f7	449	}
	450	EXPORT_SYMBOL(__kstat_install);
	451
	452	void
	453	__kstat_delete(kstat_t *ksp)
	454	{
	455	struct proc_dir_entry *de_module;
	456
	457	spin_lock(&kstat_lock);
	458	list_del_init(&ksp->ks_list);
	459	spin_unlock(&kstat_lock);
	460
	461	if (ksp->ks_proc) {
	462	de_module = ksp->ks_proc->parent;
	463	remove_proc_entry(ksp->ks_name, de_module);
	464
	465	/* Remove top level module directory if it's empty */
	466	if (proc_dir_entries(de_module) == 0)
	467	remove_proc_entry(de_module->name, de_module->parent);
	468	}
	469
	470	if (!(ksp->ks_flags & KSTAT_FLAG_VIRTUAL))
	471	kmem_free(ksp->ks_data, ksp->ks_data_size);
	472
	473	kmem_free(ksp, sizeof(*ksp));
	474
	475	return;
	476	}
	477	EXPORT_SYMBOL(__kstat_delete);
	478
04a479f7	479	int
	480	kstat_init(void)
	481	{
b17edc10	482	SENTRY;
04a479f7	483	spin_lock_init(&kstat_lock);
	484	INIT_LIST_HEAD(&kstat_list);
	485	kstat_id = 0;
b17edc10	486	SRETURN(0);
04a479f7	487	}
	488
	489	void
	490	kstat_fini(void)
	491	{
b17edc10	492	SENTRY;
04a479f7	493	ASSERT(list_empty(&kstat_list));
b17edc10	494	SEXIT;
04a479f7	495	}
04a479f7	496