iospc.c revision 4df55fde49134f9735f84011f23a767c75e393c7
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* IO Performance Counter Driver
*/
#include <sys/types.h>
#include <sys/ddi.h>
#include <sys/modctl.h>
#include "iospc.h"
/* Debugging level. */
#ifdef DEBUG
int iospc_debug = 0;
#endif /* DEBUG */
/* State structure anchor. */
void *iospc_state_p;
static int iospc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int iospc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);
static int iospc_create_name_kstat(iospc_grp_t *grp);
static void iospc_delete_name_kstats(kstat_t **name_kstats_pp,
int num_kstats);
static kstat_t *iospc_create_cntr_kstat(char *name, int dev_inst,
int (*update)(kstat_t *, int), iospc_ksinfo_t *ksinfop, int num_pics);
static int iospc_kstat_update(kstat_t *ksp, int rw);
static kstat_t *iospc_create_picN_kstat(char *mod_name, int pic,
uint64_t mask, int num_ev, iospc_event_t *ev_array);
iospc_grp_t **iospc_leaf_grps = NULL;
int iospc_kstat_inited = 0;
kmutex_t iospc_mutex;
static struct dev_ops iospc_ops = {
DEVO_REV,
0,
nulldev,
nulldev,
nulldev,
iospc_attach,
iospc_detach,
nodev,
NULL,
NULL,
nodev
};
extern struct mod_ops mod_driverops;
static struct modldrv md = {
&mod_driverops,
"IO Perf Counter Driver",
&iospc_ops,
};
static struct modlinkage ml = {
MODREV_1,
(void *)&md,
NULL
};
/*
* One-time module-wide initialization.
*/
int
_init(void)
{
int rval;
/* Initialize per-leaf soft state pointer. */
if ((rval = ddi_soft_state_init(&iospc_state_p,
sizeof (iospc_t), 1)) != DDI_SUCCESS)
return (rval);
/* If all checks out, install the module. */
if ((rval = mod_install(&ml)) != DDI_SUCCESS) {
ddi_soft_state_fini(&iospc_state_p);
return (rval);
}
mutex_init(&iospc_mutex, NULL, MUTEX_DRIVER, NULL);
return (DDI_SUCCESS);
}
/*
* One-time module-wide cleanup, after last detach is done.
*/
int
_fini(void)
{
int rval;
/*
* Remove the module first as this operation is the only thing here
* which can fail.
*/
rval = mod_remove(&ml);
if (rval != DDI_SUCCESS)
return (rval);
if (iospc_leaf_grps != NULL) {
iospc_kstat_fini();
mutex_enter(&iospc_mutex);
iospc_kstat_inited = 0;
(void) rfios_unbind_group();
iospc_leaf_grps = NULL;
mutex_exit(&iospc_mutex);
}
mutex_destroy(&iospc_mutex);
/* Free px soft state */
ddi_soft_state_fini(&iospc_state_p);
return (DDI_SUCCESS);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&ml, modinfop));
}
/*
* Per-instance initialization. Suspend/resume not supported.
*/
static int
iospc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
iospc_t *iospc_p;
int instance = ddi_get_instance(dip);
char *ptr;
IOSPC_DBG2("iospc: iospc_attach: enter\n");
switch (cmd) {
case DDI_RESUME:
case DDI_ATTACH:
/* Initialize one-time kstat structures. */
mutex_enter(&iospc_mutex);
if (!iospc_kstat_inited) {
if ((ddi_prop_lookup_string(DDI_DEV_T_ANY, dip,
0, "compatible", &ptr)) != DDI_PROP_SUCCESS)
goto bad_property;
if ((strcmp(ptr, "SUNW,ktios-pr") == 0) ||
(strcmp(ptr, "SUNW,rfios-pr") == 0)) {
iospc_leaf_grps = rfios_bind_group();
} else {
ddi_prop_free(ptr);
goto bad_property;
}
ddi_prop_free(ptr);
if (iospc_kstat_init() != DDI_SUCCESS)
goto bad_kstat_init;
iospc_kstat_inited++;
}
mutex_exit(&iospc_mutex);
if (ddi_soft_state_zalloc(iospc_state_p, instance) !=
DDI_SUCCESS) {
goto bad_softstate;
}
iospc_p = (iospc_t *)ddi_get_soft_state(iospc_state_p,
instance);
iospc_p->iospc_dip = dip;
/* Set up kstats. */
if (iospc_kstat_attach(iospc_p) != DDI_SUCCESS)
goto bad_kstat_attach;
IOSPC_DBG2("iospc: iospc_attach: exit SUCCESS\n");
return (DDI_SUCCESS);
bad_kstat_attach:
(void) ddi_soft_state_free(iospc_state_p, instance);
bad_softstate:
iospc_kstat_fini();
bad_kstat_init:
bad_property:
mutex_enter(&iospc_mutex);
IOSPC_DBG2("iospc: iospc_attach: exit FAILURE\n");
return (DDI_FAILURE);
default:
return (DDI_FAILURE);
}
}
/*
* Per-instance cleanup. Suspend/resume not supported.
*/
static int
iospc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
int instance = ddi_get_instance(dip);
IOSPC_DBG2("iospc: iospc_detach: enter\n");
iospc_t *iospc_p = (iospc_t *)ddi_get_soft_state(
iospc_state_p, instance);
switch (cmd) {
case DDI_SUSPEND:
case DDI_DETACH:
iospc_kstat_detach(iospc_p);
(void) ddi_soft_state_free(iospc_state_p, instance);
IOSPC_DBG2("iospc: iospc_detach: exit - SUCCESS\n");
return (DDI_SUCCESS);
default:
IOSPC_DBG2("iospc: iospc_detach: exit - FAILURE\n");
return (DDI_FAILURE);
}
}
#define PIC_STR_LEN 5 /* Size of a PICx name string. */
/*
* One-time initialization for this module.
*/
int
iospc_kstat_init()
{
iospc_grp_t **grp_pp;
iospc_grp_t *grp_p;
IOSPC_DBG2("iospc: kstat_init: enter\n");
/*
* Initialize the name kstats for each group, drawing upon the table
* for values.
*/
for (grp_pp = iospc_leaf_grps; *grp_pp != NULL; grp_pp++) {
grp_p = *grp_pp;
IOSPC_DBG2("Setting up group for %s\n", grp_p->grp_name);
/* Create basic pic event-type pair. */
grp_p->name_kstats_pp = kmem_zalloc((grp_p->num_counters *
sizeof (kstat_t)), KM_SLEEP);
if (iospc_create_name_kstat(grp_p) != DDI_SUCCESS) {
iospc_kstat_fini();
IOSPC_DBG1("iospc: init: failure exit\n");
return (DDI_FAILURE);
}
}
IOSPC_DBG2("iospc: kstat_init: success exit\n");
return (DDI_SUCCESS);
}
/*
* Per-instance initialization for this module.
*/
int
iospc_kstat_attach(iospc_t *iospc_p)
{
iospc_grp_t **grp_pp;
iospc_grp_t *grp_p;
iospc_ksinfo_t *ksinfo_p;
int i;
IOSPC_DBG2("iospc: kstat_attach %d: enter\n",
ddi_get_instance(iospc_p->iospc_dip));
/* Set up kstats for each group. */
for (i = 0, grp_pp = iospc_leaf_grps; *grp_pp != NULL; i++, grp_pp++) {
if (i >= IOSPC_MAX_NUM_GRPS)
goto err;
grp_p = *grp_pp;
/*
* ksinfo_p keeps all info needed by iospc_kstat_update,
* which is fired off asynchronously on demand by the kstat
* framework.
*/
ksinfo_p = (iospc_ksinfo_t *)kmem_zalloc(
sizeof (iospc_ksinfo_t), KM_SLEEP);
ksinfo_p->iospc_p = iospc_p;
ksinfo_p->grp_p = grp_p;
/* Also save in state structure, for later cleanup. */
iospc_p->iospc_ksinfo_p[i] = ksinfo_p;
/* Create counter kstats */
ksinfo_p->cntr_ksp = iospc_create_cntr_kstat(grp_p->grp_name,
ddi_get_instance(iospc_p->iospc_dip),
iospc_kstat_update, ksinfo_p, grp_p->num_counters);
if (ksinfo_p->cntr_ksp == NULL)
goto err;
if (grp_p->access_init(iospc_p, ksinfo_p) != SUCCESS)
goto err;
}
IOSPC_DBG2("iospc: kstat_attach: success exit\n");
return (DDI_SUCCESS);
err:
iospc_kstat_detach(iospc_p);
IOSPC_DBG2("iospc: kstat_attach: failure exit\n");
return (DDI_FAILURE);
}
/*
* Create the name kstats for each group.
*/
static int
iospc_create_name_kstat(iospc_grp_t *grp_p)
{
int i;
for (i = 0; i < grp_p->num_counters; i++) {
grp_p->name_kstats_pp[i] = iospc_create_picN_kstat(
grp_p->grp_name, i,
grp_p->regsel_p->fields_p[i].event_offset,
grp_p->regsel_p->fields_p[i].num_events,
grp_p->regsel_p->fields_p[i].events_p);
if (grp_p->name_kstats_pp[i] == NULL)
return (DDI_FAILURE);
}
return (DDI_SUCCESS);
}
/*
* Create the picN kstat. Returns a pointer to the
* kstat which the driver must store to allow it
* to be deleted when necessary.
*/
static kstat_t *
iospc_create_picN_kstat(char *mod_name, int pic, uint64_t ev_offset,
int num_ev, iospc_event_t *ev_array)
{
int event;
char pic_name[PIC_STR_LEN];
kstat_t *picN_ksp = NULL;
struct kstat_named *pic_named_data;
(void) snprintf(pic_name, PIC_STR_LEN, "pic%1d", pic);
if ((picN_ksp = kstat_create(mod_name, 0, pic_name,
"bus", KSTAT_TYPE_NAMED, num_ev, NULL)) == NULL) {
return (NULL);
}
/* NOTE: Number of events is assumed to always be non-zero. */
pic_named_data = (struct kstat_named *)picN_ksp->ks_data;
/*
* Fill up data section of the kstat
* Write event names and their associated pcr masks.
* num_ev - 1 is because CLEAR_PIC is added separately.
*/
for (event = 0; event < num_ev - 1; event++) {
pic_named_data[event].value.ui64 =
ev_array[event].value << ev_offset;
kstat_named_init(&pic_named_data[event],
ev_array[event].name, KSTAT_DATA_UINT64);
}
/*
* add the clear_pic entry
*/
pic_named_data[event].value.ui64 =
(uint64_t)~(ev_array[event].value << ev_offset);
kstat_named_init(&pic_named_data[event], ev_array[event].name,
KSTAT_DATA_UINT64);
kstat_install(picN_ksp);
return (picN_ksp);
}
/*
* Create the "counters" kstat.
*/
static kstat_t *
iospc_create_cntr_kstat(char *name, int dev_inst,
int (*update)(kstat_t *, int), iospc_ksinfo_t *ksinfop, int num_pics)
{
int i;
char pic_str[PIC_STR_LEN];
struct kstat *counters_ksp;
struct kstat_named *counters_named_data;
IOSPC_DBG2("iospc_create_cntr_kstat: name: %s instance: %d\n",
name, dev_inst);
/*
* Size of kstat is num_pics + 1. extra one for pcr.
*/
if ((counters_ksp = kstat_create(name, dev_inst, "counters", "bus",
KSTAT_TYPE_NAMED, num_pics + 1, KSTAT_FLAG_WRITABLE)) == NULL) {
return (NULL);
}
counters_named_data = (struct kstat_named *)(counters_ksp->ks_data);
kstat_named_init(&counters_named_data[0], "pcr", KSTAT_DATA_UINT64);
for (i = 0; i < num_pics; i++) {
(void) snprintf(pic_str, PIC_STR_LEN, "pic%1d", i);
kstat_named_init(&counters_named_data[i+1], pic_str,
KSTAT_DATA_UINT64);
}
/*
* Store the reg type and other info. in the kstat's private field
* so that they are available to the update function.
*/
counters_ksp->ks_private = (void *)ksinfop;
counters_ksp->ks_update = update;
kstat_install(counters_ksp);
return (counters_ksp);
}
/*
* Program a performance counter.
*
* reggroup is which type of counter.
* counter is the counter number.
* event is the event to program for that counter.
*/
static int
iospc_perfcnt_program(iospc_t *iospc_p, iospc_grp_t *grp_p,
iospc_ksinfo_t *ksinfo_p, uint64_t new_events)
{
uint64_t old_events;
int rval = SUCCESS;
uint64_t event_mask;
int counter;
IOSPC_DBG1(
"iospc_perfcnt_program enter: new_events:0x%" PRIx64 "\n",
new_events);
if ((rval = grp_p->access(iospc_p, ksinfo_p->arg, IOSPC_REG_READ,
grp_p->regsel_p->regoff, &old_events)) != SUCCESS)
goto done_pgm;
IOSPC_DBG1(" old_events:0x%" PRIx64 "\n", old_events);
for (counter = 0; counter < grp_p->num_counters; counter++) {
if (grp_p->counters_p[counter].zero_regoff == NO_REGISTER)
continue;
event_mask = grp_p->regsel_p->fields_p[counter].event_mask <<
grp_p->regsel_p->fields_p[counter].event_offset;
IOSPC_DBG1(
"grp:%s, counter:%d, zero_regoff:0x%lx, "
"event_mask:0x%" PRIx64 ", old&mask:0x%lx, "
"new&mask:0x%lx\n",
grp_p->grp_name, counter,
grp_p->counters_p[counter].zero_regoff,
event_mask, old_events & event_mask,
new_events & event_mask);
if ((old_events & event_mask) ==
(new_events & event_mask))
continue;
IOSPC_DBG1("Zeroing counter %d\n", counter);
if ((rval = grp_p->access(iospc_p, ksinfo_p->arg,
IOSPC_REG_WRITE, grp_p->counters_p[counter].zero_regoff,
&grp_p->counters_p[counter].zero_value)) != SUCCESS)
goto done_pgm;
}
if (old_events != new_events) {
IOSPC_DBG1("old != new, setting event reg %ld to 0x%lx\n",
grp_p->regsel_p->regoff, new_events);
if ((rval = grp_p->access(iospc_p, ksinfo_p->arg,
IOSPC_REG_WRITE, grp_p->regsel_p->regoff, &new_events))
!= SUCCESS) {
IOSPC_DBG1(
"Write of new event data failed, "
"select reg offset: %ld\n",
grp_p->regsel_p->regoff);
goto done_pgm;
}
}
done_pgm:
IOSPC_DBG1("iospc_perfcnt_program: returning status %d.\n", rval);
return (rval);
}
/*
* kstat update function. Handles reads/writes
* from/to kstat.
*/
static int
iospc_kstat_update(kstat_t *ksp, int rw)
{
struct kstat_named *data_p;
int counter;
iospc_ksinfo_t *ksinfop = ksp->ks_private;
iospc_grp_t *grp_p = ksinfop->grp_p;
iospc_t *iospc_p = ksinfop->iospc_p;
data_p = (struct kstat_named *)ksp->ks_data;
if (rw == KSTAT_WRITE) {
IOSPC_DBG2("iospc_kstat_update: wr %ld\n",
data_p[0].value.ui64);
/*
* Fields without programmable events won't be zeroed as
* iospc_perfcnt_program is what zeros them.
*/
/* This group has programmable events. */
if (grp_p->regsel_p->regoff != NO_REGISTER) {
IOSPC_DBG2("write: regoff has valid register\n");
if (iospc_perfcnt_program(iospc_p, grp_p, ksinfop,
data_p[0].value.ui64) != SUCCESS)
return (EIO);
}
} else { /* Read the event register and all of the counters. */
/* This group has programmable events. */
if (grp_p->regsel_p->regoff != NO_REGISTER) {
IOSPC_DBG2("read: regoff has valid register\n");
if (grp_p->access(iospc_p, ksinfop->arg, IOSPC_REG_READ,
grp_p->regsel_p->regoff, &data_p[0].value.ui64)
!= SUCCESS)
return (EIO);
} else
data_p[0].value.ui64 = 0ull;
IOSPC_DBG2("iospc_kstat_update: rd event %lx\n",
data_p[0].value.ui64);
for (counter = 0; counter < grp_p->num_counters; counter++) {
if (grp_p->access(iospc_p, ksinfop->arg, IOSPC_REG_READ,
grp_p->counters_p[counter].regoff,
&data_p[counter + 1].value.ui64) != SUCCESS)
return (EIO);
IOSPC_DBG2("cntr%d, off:0x%lx, val:0x%lx\n", counter,
grp_p->counters_p[counter].regoff,
data_p[counter + 1].value.ui64);
}
}
return (SUCCESS);
}
void
iospc_kstat_fini()
{
iospc_grp_t **grp_pp;
iospc_grp_t *grp_p;
int j;
IOSPC_DBG2("iospc_kstat_fini called\n");
for (j = 0, grp_pp = iospc_leaf_grps; *grp_pp != NULL; j++, grp_pp++) {
grp_p = *grp_pp;
if (grp_p->name_kstats_pp != NULL) {
iospc_delete_name_kstats(grp_p->name_kstats_pp,
grp_p->num_counters);
kmem_free(grp_p->name_kstats_pp,
grp_p->num_counters * sizeof (kstat_t));
grp_p->name_kstats_pp = NULL;
}
}
}
static void
iospc_delete_name_kstats(kstat_t **name_kstats_pp, int num_kstats)
{
int i;
if (name_kstats_pp != NULL) {
for (i = 0; i < num_kstats; i++) {
if (name_kstats_pp[i] != NULL)
kstat_delete(name_kstats_pp[i]);
}
}
}
void
iospc_kstat_detach(iospc_t *iospc_p)
{
iospc_grp_t **grp_pp;
iospc_grp_t *grp_p;
int i;
IOSPC_DBG2("iospc_kstat_detach called\n");
for (i = 0, grp_pp = iospc_leaf_grps; *grp_pp != NULL; i++, grp_pp++) {
if (i >= IOSPC_MAX_NUM_GRPS)
return;
grp_p = *grp_pp;
if (iospc_p->iospc_ksinfo_p[i] != NULL) {
grp_p->access_fini(iospc_p, iospc_p->iospc_ksinfo_p[i]);
if (iospc_p->iospc_ksinfo_p[i]->cntr_ksp != NULL)
kstat_delete(
iospc_p->iospc_ksinfo_p[i]->cntr_ksp);
kmem_free(iospc_p->iospc_ksinfo_p[i],
sizeof (iospc_ksinfo_t));
}
}
}