2005-04-16 22:20:36 +00:00
|
|
|
/*
|
2009-06-16 08:30:22 +00:00
|
|
|
* driver for channel subsystem
|
2005-04-16 22:20:36 +00:00
|
|
|
*
|
2009-06-16 08:30:22 +00:00
|
|
|
* Copyright IBM Corp. 2002, 2009
|
|
|
|
*
|
|
|
|
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
|
|
|
|
* Cornelia Huck (cornelia.huck@de.ibm.com)
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
2008-12-25 12:39:36 +00:00
|
|
|
|
|
|
|
#define KMSG_COMPONENT "cio"
|
|
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/device.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/list.h>
|
2007-10-12 14:11:20 +00:00
|
|
|
#include <linux/reboot.h>
|
2009-06-16 08:30:22 +00:00
|
|
|
#include <linux/suspend.h>
|
2008-07-14 07:58:58 +00:00
|
|
|
#include <asm/isc.h>
|
2009-03-26 14:24:01 +00:00
|
|
|
#include <asm/crw.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#include "css.h"
|
|
|
|
#include "cio.h"
|
|
|
|
#include "cio_debug.h"
|
|
|
|
#include "ioasm.h"
|
|
|
|
#include "chsc.h"
|
2006-06-29 12:57:03 +00:00
|
|
|
#include "device.h"
|
2007-04-27 14:01:34 +00:00
|
|
|
#include "idset.h"
|
2007-04-27 14:01:35 +00:00
|
|
|
#include "chp.h"
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
int css_init_done = 0;
|
2006-06-29 12:57:03 +00:00
|
|
|
static int need_reprobe = 0;
|
2006-01-06 08:19:25 +00:00
|
|
|
static int max_ssid = 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-10-12 14:11:13 +00:00
|
|
|
struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1];
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-02-05 20:18:53 +00:00
|
|
|
int
|
2006-01-06 08:19:22 +00:00
|
|
|
for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
|
|
|
|
{
|
|
|
|
struct subchannel_id schid;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
init_subchannel_id(&schid);
|
|
|
|
ret = -ENODEV;
|
|
|
|
do {
|
2006-01-06 08:19:25 +00:00
|
|
|
do {
|
|
|
|
ret = fn(schid, data);
|
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
|
|
|
|
schid.sch_no = 0;
|
|
|
|
} while (schid.ssid++ < max_ssid);
|
2006-01-06 08:19:22 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:48 +00:00
|
|
|
struct cb_data {
|
|
|
|
void *data;
|
|
|
|
struct idset *set;
|
|
|
|
int (*fn_known_sch)(struct subchannel *, void *);
|
|
|
|
int (*fn_unknown_sch)(struct subchannel_id, void *);
|
|
|
|
};
|
|
|
|
|
|
|
|
static int call_fn_known_sch(struct device *dev, void *data)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct cb_data *cb = data;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
idset_sch_del(cb->set, sch->schid);
|
|
|
|
if (cb->fn_known_sch)
|
|
|
|
rc = cb->fn_known_sch(sch, cb->data);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int call_fn_unknown_sch(struct subchannel_id schid, void *data)
|
|
|
|
{
|
|
|
|
struct cb_data *cb = data;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
if (idset_sch_contains(cb->set, schid))
|
|
|
|
rc = cb->fn_unknown_sch(schid, cb->data);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2009-03-26 14:24:11 +00:00
|
|
|
static int call_fn_all_sch(struct subchannel_id schid, void *data)
|
|
|
|
{
|
|
|
|
struct cb_data *cb = data;
|
|
|
|
struct subchannel *sch;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
sch = get_subchannel_by_schid(schid);
|
|
|
|
if (sch) {
|
|
|
|
if (cb->fn_known_sch)
|
|
|
|
rc = cb->fn_known_sch(sch, cb->data);
|
|
|
|
put_device(&sch->dev);
|
|
|
|
} else {
|
|
|
|
if (cb->fn_unknown_sch)
|
|
|
|
rc = cb->fn_unknown_sch(schid, cb->data);
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:48 +00:00
|
|
|
int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
|
|
|
|
int (*fn_unknown)(struct subchannel_id,
|
|
|
|
void *), void *data)
|
|
|
|
{
|
|
|
|
struct cb_data cb;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
cb.data = data;
|
|
|
|
cb.fn_known_sch = fn_known;
|
|
|
|
cb.fn_unknown_sch = fn_unknown;
|
2009-03-26 14:24:11 +00:00
|
|
|
|
|
|
|
cb.set = idset_sch_new();
|
|
|
|
if (!cb.set)
|
|
|
|
/* fall back to brute force scanning in case of oom */
|
|
|
|
return for_each_subchannel(call_fn_all_sch, &cb);
|
|
|
|
|
|
|
|
idset_fill(cb.set);
|
|
|
|
|
2008-01-26 13:10:48 +00:00
|
|
|
/* Process registered subchannels. */
|
|
|
|
rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
/* Process unregistered subchannels. */
|
|
|
|
if (fn_unknown)
|
|
|
|
rc = for_each_subchannel(call_fn_unknown_sch, &cb);
|
|
|
|
out:
|
|
|
|
idset_free(cb.set);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static struct subchannel *
|
2006-01-06 08:19:21 +00:00
|
|
|
css_alloc_subchannel(struct subchannel_id schid)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA);
|
|
|
|
if (sch == NULL)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
2006-01-06 08:19:21 +00:00
|
|
|
ret = cio_validate_subchannel (sch, schid);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (ret < 0) {
|
|
|
|
kfree(sch);
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
}
|
|
|
|
return sch;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
css_free_subchannel(struct subchannel *sch)
|
|
|
|
{
|
|
|
|
if (sch) {
|
|
|
|
/* Reset intparm to zeroes. */
|
2008-12-25 12:39:13 +00:00
|
|
|
sch->config.intparm = 0;
|
|
|
|
cio_commit_config(sch);
|
2006-12-08 14:54:26 +00:00
|
|
|
kfree(sch->lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
kfree(sch);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
css_subchannel_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
|
|
|
|
|
|
|
sch = to_subchannel(dev);
|
2006-12-08 14:54:26 +00:00
|
|
|
if (!cio_is_console(sch->schid)) {
|
2009-09-11 08:28:16 +00:00
|
|
|
/* Reset intparm to zeroes. */
|
|
|
|
sch->config.intparm = 0;
|
|
|
|
cio_commit_config(sch);
|
2006-12-08 14:54:26 +00:00
|
|
|
kfree(sch->lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
kfree(sch);
|
2006-12-08 14:54:26 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-07-27 10:29:10 +00:00
|
|
|
static int css_sch_device_register(struct subchannel *sch)
|
2006-07-12 14:39:50 +00:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_lock(&sch->reg_mutex);
|
2009-09-11 08:28:24 +00:00
|
|
|
if (cio_is_console(sch->schid))
|
|
|
|
sch->dev.init_name = cio_get_console_sch_name(sch->schid);
|
|
|
|
else
|
|
|
|
dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid,
|
|
|
|
sch->schid.sch_no);
|
2006-07-12 14:39:50 +00:00
|
|
|
ret = device_register(&sch->dev);
|
|
|
|
mutex_unlock(&sch->reg_mutex);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-07-14 07:58:47 +00:00
|
|
|
/**
|
|
|
|
* css_sch_device_unregister - unregister a subchannel
|
|
|
|
* @sch: subchannel to be unregistered
|
|
|
|
*/
|
2006-07-12 14:39:50 +00:00
|
|
|
void css_sch_device_unregister(struct subchannel *sch)
|
|
|
|
{
|
|
|
|
mutex_lock(&sch->reg_mutex);
|
2008-07-14 07:59:20 +00:00
|
|
|
if (device_is_registered(&sch->dev))
|
|
|
|
device_unregister(&sch->dev);
|
2006-07-12 14:39:50 +00:00
|
|
|
mutex_unlock(&sch->reg_mutex);
|
|
|
|
}
|
2008-07-14 07:58:47 +00:00
|
|
|
EXPORT_SYMBOL_GPL(css_sch_device_unregister);
|
2006-07-12 14:39:50 +00:00
|
|
|
|
2007-04-27 14:01:35 +00:00
|
|
|
static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int mask;
|
|
|
|
|
|
|
|
memset(ssd, 0, sizeof(struct chsc_ssd_info));
|
|
|
|
ssd->path_mask = pmcw->pim;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
|
|
mask = 0x80 >> i;
|
|
|
|
if (pmcw->pim & mask) {
|
|
|
|
chp_id_init(&ssd->chpid[i]);
|
|
|
|
ssd->chpid[i].id = pmcw->chpid[i];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ssd_register_chpids(struct chsc_ssd_info *ssd)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int mask;
|
|
|
|
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
|
|
mask = 0x80 >> i;
|
|
|
|
if (ssd->path_mask & mask)
|
|
|
|
if (!chp_is_registered(ssd->chpid[i]))
|
|
|
|
chp_new(ssd->chpid[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void css_update_ssd_info(struct subchannel *sch)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (cio_is_console(sch->schid)) {
|
|
|
|
/* Console is initialized too early for functions requiring
|
|
|
|
* memory allocation. */
|
|
|
|
ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
|
|
|
|
} else {
|
|
|
|
ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
|
|
|
|
if (ret)
|
|
|
|
ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
|
|
|
|
ssd_register_chpids(&sch->ssd_info);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-14 07:58:44 +00:00
|
|
|
static ssize_t type_show(struct device *dev, struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
|
|
|
|
return sprintf(buf, "%01x\n", sch->st);
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(type, 0444, type_show, NULL);
|
|
|
|
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
|
|
|
|
return sprintf(buf, "css:t%01X\n", sch->st);
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
|
|
|
|
|
|
|
|
static struct attribute *subch_attrs[] = {
|
|
|
|
&dev_attr_type.attr,
|
|
|
|
&dev_attr_modalias.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group subch_attr_group = {
|
|
|
|
.attrs = subch_attrs,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group *default_subch_attr_groups[] = {
|
|
|
|
&subch_attr_group,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
2007-04-27 14:01:35 +00:00
|
|
|
static int css_register_subchannel(struct subchannel *sch)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* Initialize the subchannel structure */
|
2007-10-12 14:11:13 +00:00
|
|
|
sch->dev.parent = &channel_subsystems[0]->device;
|
2005-04-16 22:20:36 +00:00
|
|
|
sch->dev.bus = &css_bus_type;
|
|
|
|
sch->dev.release = &css_subchannel_release;
|
2008-07-14 07:58:44 +00:00
|
|
|
sch->dev.groups = default_subch_attr_groups;
|
2007-10-22 10:52:41 +00:00
|
|
|
/*
|
|
|
|
* We don't want to generate uevents for I/O subchannels that don't
|
|
|
|
* have a working ccw device behind them since they will be
|
|
|
|
* unregistered before they can be used anyway, so we delay the add
|
|
|
|
* uevent until after device recognition was successful.
|
2008-07-14 07:58:44 +00:00
|
|
|
* Note that we suppress the uevent for all subchannel types;
|
|
|
|
* the subchannel driver can decide itself when it wants to inform
|
|
|
|
* userspace of its existence.
|
2007-10-22 10:52:41 +00:00
|
|
|
*/
|
2009-03-01 13:10:49 +00:00
|
|
|
dev_set_uevent_suppress(&sch->dev, 1);
|
2007-04-27 14:01:35 +00:00
|
|
|
css_update_ssd_info(sch);
|
2005-04-16 22:20:36 +00:00
|
|
|
/* make it known to the system */
|
2006-07-12 14:39:50 +00:00
|
|
|
ret = css_sch_device_register(sch);
|
2006-12-08 14:54:21 +00:00
|
|
|
if (ret) {
|
2007-07-27 10:29:19 +00:00
|
|
|
CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n",
|
|
|
|
sch->schid.ssid, sch->schid.sch_no, ret);
|
2006-12-08 14:54:21 +00:00
|
|
|
return ret;
|
|
|
|
}
|
2008-07-14 07:58:44 +00:00
|
|
|
if (!sch->driver) {
|
|
|
|
/*
|
|
|
|
* No driver matched. Generate the uevent now so that
|
|
|
|
* a fitting driver module may be loaded based on the
|
|
|
|
* modalias.
|
|
|
|
*/
|
2009-03-01 13:10:49 +00:00
|
|
|
dev_set_uevent_suppress(&sch->dev, 0);
|
2008-07-14 07:58:44 +00:00
|
|
|
kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-07-14 07:58:45 +00:00
|
|
|
int css_probe_device(struct subchannel_id schid)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct subchannel *sch;
|
|
|
|
|
2006-01-06 08:19:21 +00:00
|
|
|
sch = css_alloc_subchannel(schid);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (IS_ERR(sch))
|
|
|
|
return PTR_ERR(sch);
|
|
|
|
ret = css_register_subchannel(sch);
|
|
|
|
if (ret)
|
|
|
|
css_free_subchannel(sch);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2005-06-25 21:55:27 +00:00
|
|
|
static int
|
|
|
|
check_subchannel(struct device * dev, void * data)
|
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
2006-01-06 08:19:21 +00:00
|
|
|
struct subchannel_id *schid = data;
|
2005-06-25 21:55:27 +00:00
|
|
|
|
|
|
|
sch = to_subchannel(dev);
|
2006-01-06 08:19:21 +00:00
|
|
|
return schid_equal(&sch->schid, schid);
|
2005-06-25 21:55:27 +00:00
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
struct subchannel *
|
2006-01-06 08:19:21 +00:00
|
|
|
get_subchannel_by_schid(struct subchannel_id schid)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct device *dev;
|
|
|
|
|
2005-06-25 21:55:27 +00:00
|
|
|
dev = bus_find_device(&css_bus_type, NULL,
|
2006-10-11 13:31:47 +00:00
|
|
|
&schid, check_subchannel);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-25 21:55:27 +00:00
|
|
|
return dev ? to_subchannel(dev) : NULL;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:45 +00:00
|
|
|
/**
|
|
|
|
* css_sch_is_valid() - check if a subchannel is valid
|
|
|
|
* @schib: subchannel information block for the subchannel
|
|
|
|
*/
|
|
|
|
int css_sch_is_valid(struct schib *schib)
|
|
|
|
{
|
|
|
|
if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
|
|
|
|
return 0;
|
2008-07-14 07:58:48 +00:00
|
|
|
if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w)
|
|
|
|
return 0;
|
2008-01-26 13:10:45 +00:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(css_sch_is_valid);
|
|
|
|
|
2006-09-20 14:00:01 +00:00
|
|
|
static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
|
|
|
|
{
|
|
|
|
struct schib schib;
|
|
|
|
|
|
|
|
if (!slow) {
|
|
|
|
/* Will be done on the slow path. */
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
2008-01-26 13:10:45 +00:00
|
|
|
if (stsch_err(schid, &schib) || !css_sch_is_valid(&schib)) {
|
2006-09-20 14:00:01 +00:00
|
|
|
/* Unusable - ignore. */
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2006-09-20 14:00:01 +00:00
|
|
|
CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, "
|
|
|
|
"slow path.\n", schid.ssid, schid.sch_no, CIO_OPER);
|
|
|
|
|
|
|
|
return css_probe_device(schid);
|
|
|
|
}
|
|
|
|
|
2008-07-14 07:58:45 +00:00
|
|
|
static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (sch->driver) {
|
|
|
|
if (sch->driver->sch_event)
|
|
|
|
ret = sch->driver->sch_event(sch, slow);
|
|
|
|
else
|
|
|
|
dev_dbg(&sch->dev,
|
|
|
|
"Got subchannel machine check but "
|
|
|
|
"no sch_event handler provided.\n");
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-04-27 14:01:34 +00:00
|
|
|
static void css_evaluate_subchannel(struct subchannel_id schid, int slow)
|
2006-09-20 14:00:01 +00:00
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
sch = get_subchannel_by_schid(schid);
|
|
|
|
if (sch) {
|
|
|
|
ret = css_evaluate_known_subchannel(sch, slow);
|
|
|
|
put_device(&sch->dev);
|
|
|
|
} else
|
|
|
|
ret = css_evaluate_new_subchannel(schid, slow);
|
2007-04-27 14:01:34 +00:00
|
|
|
if (ret == -EAGAIN)
|
|
|
|
css_schedule_eval(schid);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-04-27 14:01:34 +00:00
|
|
|
static struct idset *slow_subchannel_set;
|
|
|
|
static spinlock_t slow_subchannel_lock;
|
|
|
|
|
|
|
|
static int __init slow_subchannel_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-04-27 14:01:34 +00:00
|
|
|
spin_lock_init(&slow_subchannel_lock);
|
|
|
|
slow_subchannel_set = idset_sch_new();
|
|
|
|
if (!slow_subchannel_set) {
|
2007-07-27 10:29:19 +00:00
|
|
|
CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n");
|
2007-04-27 14:01:34 +00:00
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:48 +00:00
|
|
|
static int slow_eval_known_fn(struct subchannel *sch, void *data)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-01-26 13:10:48 +00:00
|
|
|
int eval;
|
|
|
|
int rc;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
spin_lock_irq(&slow_subchannel_lock);
|
2008-01-26 13:10:48 +00:00
|
|
|
eval = idset_sch_contains(slow_subchannel_set, sch->schid);
|
|
|
|
idset_sch_del(slow_subchannel_set, sch->schid);
|
|
|
|
spin_unlock_irq(&slow_subchannel_lock);
|
|
|
|
if (eval) {
|
|
|
|
rc = css_evaluate_known_subchannel(sch, 1);
|
|
|
|
if (rc == -EAGAIN)
|
|
|
|
css_schedule_eval(sch->schid);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-01-26 13:10:48 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
|
|
|
|
{
|
|
|
|
int eval;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
spin_lock_irq(&slow_subchannel_lock);
|
|
|
|
eval = idset_sch_contains(slow_subchannel_set, schid);
|
|
|
|
idset_sch_del(slow_subchannel_set, schid);
|
2005-04-16 22:20:36 +00:00
|
|
|
spin_unlock_irq(&slow_subchannel_lock);
|
2008-01-26 13:10:48 +00:00
|
|
|
if (eval) {
|
|
|
|
rc = css_evaluate_new_subchannel(schid, 1);
|
|
|
|
switch (rc) {
|
|
|
|
case -EAGAIN:
|
|
|
|
css_schedule_eval(schid);
|
|
|
|
rc = 0;
|
|
|
|
break;
|
|
|
|
case -ENXIO:
|
|
|
|
case -ENOMEM:
|
|
|
|
case -EIO:
|
|
|
|
/* These should abort looping */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
rc = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void css_slow_path_func(struct work_struct *unused)
|
|
|
|
{
|
|
|
|
CIO_TRACE_EVENT(4, "slowpath");
|
|
|
|
for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn,
|
|
|
|
NULL);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-04-27 14:01:34 +00:00
|
|
|
static DECLARE_WORK(slow_path_work, css_slow_path_func);
|
2005-04-16 22:20:36 +00:00
|
|
|
struct workqueue_struct *slow_path_wq;
|
|
|
|
|
2007-04-27 14:01:34 +00:00
|
|
|
void css_schedule_eval(struct subchannel_id schid)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&slow_subchannel_lock, flags);
|
|
|
|
idset_sch_add(slow_subchannel_set, schid);
|
|
|
|
queue_work(slow_path_wq, &slow_path_work);
|
|
|
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
void css_schedule_eval_all(void)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&slow_subchannel_lock, flags);
|
|
|
|
idset_fill(slow_subchannel_set);
|
|
|
|
queue_work(slow_path_wq, &slow_path_work);
|
|
|
|
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
|
|
|
|
}
|
|
|
|
|
2008-04-17 05:45:59 +00:00
|
|
|
void css_wait_for_slow_path(void)
|
|
|
|
{
|
|
|
|
flush_workqueue(slow_path_wq);
|
|
|
|
}
|
|
|
|
|
2006-06-29 12:57:03 +00:00
|
|
|
/* Reprobe subchannel if unregistered. */
|
|
|
|
static int reprobe_subchannel(struct subchannel_id schid, void *data)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2007-07-27 10:29:19 +00:00
|
|
|
CIO_MSG_EVENT(6, "cio: reprobe 0.%x.%04x\n",
|
|
|
|
schid.ssid, schid.sch_no);
|
2006-06-29 12:57:03 +00:00
|
|
|
if (need_reprobe)
|
|
|
|
return -EAGAIN;
|
|
|
|
|
|
|
|
ret = css_probe_device(schid);
|
|
|
|
switch (ret) {
|
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
case -ENXIO:
|
|
|
|
case -ENOMEM:
|
2007-12-04 15:09:02 +00:00
|
|
|
case -EIO:
|
2006-06-29 12:57:03 +00:00
|
|
|
/* These should abort looping */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2009-03-26 14:24:20 +00:00
|
|
|
static void reprobe_after_idle(struct work_struct *unused)
|
|
|
|
{
|
|
|
|
/* Make sure initial subchannel scan is done. */
|
|
|
|
wait_event(ccw_device_init_wq,
|
|
|
|
atomic_read(&ccw_device_init_count) == 0);
|
|
|
|
if (need_reprobe)
|
|
|
|
css_schedule_reprobe();
|
|
|
|
}
|
|
|
|
|
|
|
|
static DECLARE_WORK(reprobe_idle_work, reprobe_after_idle);
|
|
|
|
|
2006-06-29 12:57:03 +00:00
|
|
|
/* Work function used to reprobe all unregistered subchannels. */
|
2006-12-06 19:18:20 +00:00
|
|
|
static void reprobe_all(struct work_struct *unused)
|
2006-06-29 12:57:03 +00:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2008-05-07 07:22:54 +00:00
|
|
|
CIO_MSG_EVENT(4, "reprobe start\n");
|
2006-06-29 12:57:03 +00:00
|
|
|
|
|
|
|
/* Make sure initial subchannel scan is done. */
|
2009-03-26 14:24:20 +00:00
|
|
|
if (atomic_read(&ccw_device_init_count) != 0) {
|
|
|
|
queue_work(ccw_device_work, &reprobe_idle_work);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
need_reprobe = 0;
|
2008-01-26 13:10:48 +00:00
|
|
|
ret = for_each_subchannel_staged(NULL, reprobe_subchannel, NULL);
|
2006-06-29 12:57:03 +00:00
|
|
|
|
2008-05-07 07:22:54 +00:00
|
|
|
CIO_MSG_EVENT(4, "reprobe done (rc=%d, need_reprobe=%d)\n", ret,
|
2006-06-29 12:57:03 +00:00
|
|
|
need_reprobe);
|
|
|
|
}
|
|
|
|
|
2007-02-05 20:16:47 +00:00
|
|
|
static DECLARE_WORK(css_reprobe_work, reprobe_all);
|
2006-06-29 12:57:03 +00:00
|
|
|
|
|
|
|
/* Schedule reprobing of all unregistered subchannels. */
|
|
|
|
void css_schedule_reprobe(void)
|
|
|
|
{
|
|
|
|
need_reprobe = 1;
|
2007-11-20 10:13:41 +00:00
|
|
|
queue_work(slow_path_wq, &css_reprobe_work);
|
2006-06-29 12:57:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(css_schedule_reprobe);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Called from the machine check handler for subchannel report words.
|
|
|
|
*/
|
2008-07-14 07:58:46 +00:00
|
|
|
static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-01-06 08:19:21 +00:00
|
|
|
struct subchannel_id mchk_schid;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-07-14 07:58:46 +00:00
|
|
|
if (overflow) {
|
|
|
|
css_schedule_eval_all();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, "
|
|
|
|
"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
|
|
|
|
crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
|
|
|
|
crw0->erc, crw0->rsid);
|
|
|
|
if (crw1)
|
|
|
|
CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, "
|
|
|
|
"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
|
|
|
|
crw1->slct, crw1->oflw, crw1->chn, crw1->rsc,
|
|
|
|
crw1->anc, crw1->erc, crw1->rsid);
|
2006-01-06 08:19:21 +00:00
|
|
|
init_subchannel_id(&mchk_schid);
|
2008-07-14 07:58:46 +00:00
|
|
|
mchk_schid.sch_no = crw0->rsid;
|
|
|
|
if (crw1)
|
|
|
|
mchk_schid.ssid = (crw1->rsid >> 8) & 3;
|
2006-01-06 08:19:25 +00:00
|
|
|
|
2008-07-14 07:58:46 +00:00
|
|
|
/*
|
2005-04-16 22:20:36 +00:00
|
|
|
* Since we are always presented with IPI in the CRW, we have to
|
|
|
|
* use stsch() to find out if the subchannel in question has come
|
|
|
|
* or gone.
|
|
|
|
*/
|
2007-04-27 14:01:34 +00:00
|
|
|
css_evaluate_subchannel(mchk_schid, 0);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2006-01-06 08:19:22 +00:00
|
|
|
static int __init
|
|
|
|
__init_channel_subsystem(struct subchannel_id schid, void *data)
|
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (cio_is_console(schid))
|
|
|
|
sch = cio_get_console_subchannel();
|
|
|
|
else {
|
|
|
|
sch = css_alloc_subchannel(schid);
|
|
|
|
if (IS_ERR(sch))
|
|
|
|
ret = PTR_ERR(sch);
|
|
|
|
else
|
|
|
|
ret = 0;
|
|
|
|
switch (ret) {
|
|
|
|
case 0:
|
|
|
|
break;
|
|
|
|
case -ENOMEM:
|
|
|
|
panic("Out of memory in init_channel_subsystem\n");
|
|
|
|
/* -ENXIO: no more subchannels. */
|
|
|
|
case -ENXIO:
|
|
|
|
return ret;
|
2006-03-15 03:50:17 +00:00
|
|
|
/* -EIO: this subchannel set not supported. */
|
|
|
|
case -EIO:
|
|
|
|
return ret;
|
2006-01-06 08:19:22 +00:00
|
|
|
default:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* We register ALL valid subchannels in ioinfo, even those
|
|
|
|
* that have been present before init_channel_subsystem.
|
|
|
|
* These subchannels can't have been registered yet (kmalloc
|
|
|
|
* not working) so we do it now. This is true e.g. for the
|
|
|
|
* console subchannel.
|
|
|
|
*/
|
|
|
|
css_register_subchannel(sch);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static void __init
|
2006-01-06 08:19:23 +00:00
|
|
|
css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-07-14 07:58:57 +00:00
|
|
|
if (css_general_characteristics.mcss) {
|
2006-01-06 08:19:23 +00:00
|
|
|
css->global_pgid.pgid_high.ext_cssid.version = 0x80;
|
|
|
|
css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
|
|
|
|
} else {
|
2005-04-16 22:20:36 +00:00
|
|
|
#ifdef CONFIG_SMP
|
2009-03-26 14:24:42 +00:00
|
|
|
css->global_pgid.pgid_high.cpu_addr = stap();
|
2005-04-16 22:20:36 +00:00
|
|
|
#else
|
2006-01-06 08:19:23 +00:00
|
|
|
css->global_pgid.pgid_high.cpu_addr = 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
#endif
|
|
|
|
}
|
2006-01-06 08:19:23 +00:00
|
|
|
css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
|
|
|
|
css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
|
|
|
|
css->global_pgid.tod_high = tod_high;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2006-01-06 08:19:26 +00:00
|
|
|
static void
|
|
|
|
channel_subsystem_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct channel_subsystem *css;
|
|
|
|
|
|
|
|
css = to_css(dev);
|
2006-03-24 11:15:14 +00:00
|
|
|
mutex_destroy(&css->mutex);
|
2008-09-09 10:38:57 +00:00
|
|
|
if (css->pseudo_subchannel) {
|
|
|
|
/* Implies that it has been generated but never registered. */
|
|
|
|
css_subchannel_release(&css->pseudo_subchannel->dev);
|
|
|
|
css->pseudo_subchannel = NULL;
|
|
|
|
}
|
2006-01-06 08:19:26 +00:00
|
|
|
kfree(css);
|
|
|
|
}
|
|
|
|
|
2006-03-24 11:15:14 +00:00
|
|
|
static ssize_t
|
|
|
|
css_cm_enable_show(struct device *dev, struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct channel_subsystem *css = to_css(dev);
|
2008-04-17 05:46:01 +00:00
|
|
|
int ret;
|
2006-03-24 11:15:14 +00:00
|
|
|
|
|
|
|
if (!css)
|
|
|
|
return 0;
|
2008-04-17 05:46:01 +00:00
|
|
|
mutex_lock(&css->mutex);
|
|
|
|
ret = sprintf(buf, "%x\n", css->cm_enabled);
|
|
|
|
mutex_unlock(&css->mutex);
|
|
|
|
return ret;
|
2006-03-24 11:15:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
|
|
|
css_cm_enable_store(struct device *dev, struct device_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct channel_subsystem *css = to_css(dev);
|
|
|
|
int ret;
|
2008-04-30 11:38:33 +00:00
|
|
|
unsigned long val;
|
2006-03-24 11:15:14 +00:00
|
|
|
|
2008-04-30 11:38:33 +00:00
|
|
|
ret = strict_strtoul(buf, 16, &val);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
2008-04-17 05:46:01 +00:00
|
|
|
mutex_lock(&css->mutex);
|
2008-04-30 11:38:33 +00:00
|
|
|
switch (val) {
|
|
|
|
case 0:
|
2006-03-24 11:15:14 +00:00
|
|
|
ret = css->cm_enabled ? chsc_secm(css, 0) : 0;
|
|
|
|
break;
|
2008-04-30 11:38:33 +00:00
|
|
|
case 1:
|
2006-03-24 11:15:14 +00:00
|
|
|
ret = css->cm_enabled ? 0 : chsc_secm(css, 1);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = -EINVAL;
|
|
|
|
}
|
2008-04-17 05:46:01 +00:00
|
|
|
mutex_unlock(&css->mutex);
|
2006-03-24 11:15:14 +00:00
|
|
|
return ret < 0 ? ret : count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store);
|
|
|
|
|
2007-02-05 20:18:53 +00:00
|
|
|
static int __init setup_css(int nr)
|
2006-01-06 08:19:23 +00:00
|
|
|
{
|
|
|
|
u32 tod_high;
|
2006-12-08 14:54:28 +00:00
|
|
|
int ret;
|
2007-10-12 14:11:13 +00:00
|
|
|
struct channel_subsystem *css;
|
2006-01-06 08:19:23 +00:00
|
|
|
|
2007-10-12 14:11:13 +00:00
|
|
|
css = channel_subsystems[nr];
|
|
|
|
memset(css, 0, sizeof(struct channel_subsystem));
|
|
|
|
css->pseudo_subchannel =
|
|
|
|
kzalloc(sizeof(*css->pseudo_subchannel), GFP_KERNEL);
|
|
|
|
if (!css->pseudo_subchannel)
|
2006-12-08 14:54:28 +00:00
|
|
|
return -ENOMEM;
|
2007-10-12 14:11:13 +00:00
|
|
|
css->pseudo_subchannel->dev.parent = &css->device;
|
|
|
|
css->pseudo_subchannel->dev.release = css_subchannel_release;
|
2008-10-10 19:33:10 +00:00
|
|
|
dev_set_name(&css->pseudo_subchannel->dev, "defunct");
|
2007-10-12 14:11:13 +00:00
|
|
|
ret = cio_create_sch_lock(css->pseudo_subchannel);
|
2006-12-08 14:54:28 +00:00
|
|
|
if (ret) {
|
2007-10-12 14:11:13 +00:00
|
|
|
kfree(css->pseudo_subchannel);
|
2006-12-08 14:54:28 +00:00
|
|
|
return ret;
|
|
|
|
}
|
2007-10-12 14:11:13 +00:00
|
|
|
mutex_init(&css->mutex);
|
|
|
|
css->valid = 1;
|
|
|
|
css->cssid = nr;
|
2008-10-10 19:33:10 +00:00
|
|
|
dev_set_name(&css->device, "css%x", nr);
|
2007-10-12 14:11:13 +00:00
|
|
|
css->device.release = channel_subsystem_release;
|
2006-01-06 08:19:23 +00:00
|
|
|
tod_high = (u32) (get_clock() >> 32);
|
2007-10-12 14:11:13 +00:00
|
|
|
css_generate_pgid(css, tod_high);
|
2006-12-08 14:54:28 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-10-12 14:11:20 +00:00
|
|
|
static int css_reboot_event(struct notifier_block *this,
|
|
|
|
unsigned long event,
|
|
|
|
void *ptr)
|
|
|
|
{
|
|
|
|
int ret, i;
|
|
|
|
|
|
|
|
ret = NOTIFY_DONE;
|
|
|
|
for (i = 0; i <= __MAX_CSSID; i++) {
|
|
|
|
struct channel_subsystem *css;
|
|
|
|
|
|
|
|
css = channel_subsystems[i];
|
2008-04-17 05:46:01 +00:00
|
|
|
mutex_lock(&css->mutex);
|
2007-10-12 14:11:20 +00:00
|
|
|
if (css->cm_enabled)
|
|
|
|
if (chsc_secm(css, 0))
|
|
|
|
ret = NOTIFY_BAD;
|
2008-04-17 05:46:01 +00:00
|
|
|
mutex_unlock(&css->mutex);
|
2007-10-12 14:11:20 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block css_reboot_notifier = {
|
|
|
|
.notifier_call = css_reboot_event,
|
|
|
|
};
|
|
|
|
|
2009-06-16 08:30:22 +00:00
|
|
|
/*
|
|
|
|
* Since the css devices are neither on a bus nor have a class
|
|
|
|
* nor have a special device type, we cannot stop/restart channel
|
|
|
|
* path measurements via the normal suspend/resume callbacks, but have
|
|
|
|
* to use notifiers.
|
|
|
|
*/
|
|
|
|
static int css_power_event(struct notifier_block *this, unsigned long event,
|
|
|
|
void *ptr)
|
|
|
|
{
|
|
|
|
void *secm_area;
|
|
|
|
int ret, i;
|
|
|
|
|
|
|
|
switch (event) {
|
|
|
|
case PM_HIBERNATION_PREPARE:
|
|
|
|
case PM_SUSPEND_PREPARE:
|
|
|
|
ret = NOTIFY_DONE;
|
|
|
|
for (i = 0; i <= __MAX_CSSID; i++) {
|
|
|
|
struct channel_subsystem *css;
|
|
|
|
|
|
|
|
css = channel_subsystems[i];
|
|
|
|
mutex_lock(&css->mutex);
|
|
|
|
if (!css->cm_enabled) {
|
|
|
|
mutex_unlock(&css->mutex);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
secm_area = (void *)get_zeroed_page(GFP_KERNEL |
|
|
|
|
GFP_DMA);
|
|
|
|
if (secm_area) {
|
|
|
|
if (__chsc_do_secm(css, 0, secm_area))
|
|
|
|
ret = NOTIFY_BAD;
|
|
|
|
free_page((unsigned long)secm_area);
|
|
|
|
} else
|
|
|
|
ret = NOTIFY_BAD;
|
|
|
|
|
|
|
|
mutex_unlock(&css->mutex);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case PM_POST_HIBERNATION:
|
|
|
|
case PM_POST_SUSPEND:
|
|
|
|
ret = NOTIFY_DONE;
|
|
|
|
for (i = 0; i <= __MAX_CSSID; i++) {
|
|
|
|
struct channel_subsystem *css;
|
|
|
|
|
|
|
|
css = channel_subsystems[i];
|
|
|
|
mutex_lock(&css->mutex);
|
|
|
|
if (!css->cm_enabled) {
|
|
|
|
mutex_unlock(&css->mutex);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
secm_area = (void *)get_zeroed_page(GFP_KERNEL |
|
|
|
|
GFP_DMA);
|
|
|
|
if (secm_area) {
|
|
|
|
if (__chsc_do_secm(css, 1, secm_area))
|
|
|
|
ret = NOTIFY_BAD;
|
|
|
|
free_page((unsigned long)secm_area);
|
|
|
|
} else
|
|
|
|
ret = NOTIFY_BAD;
|
|
|
|
|
|
|
|
mutex_unlock(&css->mutex);
|
|
|
|
}
|
|
|
|
/* search for subchannels, which appeared during hibernation */
|
|
|
|
css_schedule_reprobe();
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
}
|
|
|
|
static struct notifier_block css_power_notifier = {
|
|
|
|
.notifier_call = css_power_event,
|
|
|
|
};
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Now that the driver core is running, we can setup our channel subsystem.
|
|
|
|
* The struct subchannel's are created during probing (except for the
|
|
|
|
* static console subchannel).
|
|
|
|
*/
|
|
|
|
static int __init
|
|
|
|
init_channel_subsystem (void)
|
|
|
|
{
|
2006-01-06 08:19:23 +00:00
|
|
|
int ret, i;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-07-27 10:29:21 +00:00
|
|
|
ret = chsc_determine_css_characteristics();
|
|
|
|
if (ret == -ENOMEM)
|
|
|
|
goto out; /* No need to continue. */
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-07-27 10:29:21 +00:00
|
|
|
ret = chsc_alloc_sei_area();
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = slow_subchannel_init();
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
2009-03-26 14:24:01 +00:00
|
|
|
ret = crw_register_handler(CRW_RSC_SCH, css_process_crw);
|
2008-07-14 07:58:46 +00:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if ((ret = bus_register(&css_bus_type)))
|
|
|
|
goto out;
|
|
|
|
|
2006-01-06 08:19:25 +00:00
|
|
|
/* Try to enable MSS. */
|
|
|
|
ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
|
|
|
|
switch (ret) {
|
|
|
|
case 0: /* Success. */
|
|
|
|
max_ssid = __MAX_SSID;
|
|
|
|
break;
|
|
|
|
case -ENOMEM:
|
|
|
|
goto out_bus;
|
|
|
|
default:
|
|
|
|
max_ssid = 0;
|
|
|
|
}
|
2006-01-06 08:19:23 +00:00
|
|
|
/* Setup css structure. */
|
|
|
|
for (i = 0; i <= __MAX_CSSID; i++) {
|
2007-10-12 14:11:13 +00:00
|
|
|
struct channel_subsystem *css;
|
|
|
|
|
|
|
|
css = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL);
|
|
|
|
if (!css) {
|
2006-01-06 08:19:23 +00:00
|
|
|
ret = -ENOMEM;
|
2006-01-06 08:19:25 +00:00
|
|
|
goto out_unregister;
|
2006-01-06 08:19:23 +00:00
|
|
|
}
|
2007-10-12 14:11:13 +00:00
|
|
|
channel_subsystems[i] = css;
|
2006-12-08 14:54:28 +00:00
|
|
|
ret = setup_css(i);
|
2008-09-09 10:38:57 +00:00
|
|
|
if (ret) {
|
|
|
|
kfree(channel_subsystems[i]);
|
|
|
|
goto out_unregister;
|
|
|
|
}
|
2007-10-12 14:11:13 +00:00
|
|
|
ret = device_register(&css->device);
|
2008-09-09 10:38:57 +00:00
|
|
|
if (ret) {
|
|
|
|
put_device(&css->device);
|
|
|
|
goto out_unregister;
|
|
|
|
}
|
2008-07-14 07:58:57 +00:00
|
|
|
if (css_chsc_characteristics.secm) {
|
2007-10-12 14:11:13 +00:00
|
|
|
ret = device_create_file(&css->device,
|
2006-07-12 14:40:19 +00:00
|
|
|
&dev_attr_cm_enable);
|
|
|
|
if (ret)
|
|
|
|
goto out_device;
|
|
|
|
}
|
2007-10-12 14:11:13 +00:00
|
|
|
ret = device_register(&css->pseudo_subchannel->dev);
|
2006-12-08 14:54:28 +00:00
|
|
|
if (ret)
|
|
|
|
goto out_file;
|
2006-01-06 08:19:23 +00:00
|
|
|
}
|
2007-10-12 14:11:20 +00:00
|
|
|
ret = register_reboot_notifier(&css_reboot_notifier);
|
|
|
|
if (ret)
|
2008-09-09 10:38:57 +00:00
|
|
|
goto out_unregister;
|
2009-06-16 08:30:22 +00:00
|
|
|
ret = register_pm_notifier(&css_power_notifier);
|
|
|
|
if (ret) {
|
|
|
|
unregister_reboot_notifier(&css_reboot_notifier);
|
|
|
|
goto out_unregister;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
css_init_done = 1;
|
|
|
|
|
2008-07-14 07:58:58 +00:00
|
|
|
/* Enable default isc for I/O subchannels. */
|
2008-07-14 07:59:01 +00:00
|
|
|
isc_register(IO_SCH_ISC);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-01-06 08:19:22 +00:00
|
|
|
for_each_subchannel(__init_channel_subsystem, NULL);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
2006-12-08 14:54:28 +00:00
|
|
|
out_file:
|
2008-09-09 10:38:57 +00:00
|
|
|
if (css_chsc_characteristics.secm)
|
|
|
|
device_remove_file(&channel_subsystems[i]->device,
|
|
|
|
&dev_attr_cm_enable);
|
2006-07-12 14:40:19 +00:00
|
|
|
out_device:
|
2007-10-12 14:11:13 +00:00
|
|
|
device_unregister(&channel_subsystems[i]->device);
|
2006-01-06 08:19:25 +00:00
|
|
|
out_unregister:
|
2006-01-06 08:19:23 +00:00
|
|
|
while (i > 0) {
|
2007-10-12 14:11:13 +00:00
|
|
|
struct channel_subsystem *css;
|
|
|
|
|
2006-01-06 08:19:23 +00:00
|
|
|
i--;
|
2007-10-12 14:11:13 +00:00
|
|
|
css = channel_subsystems[i];
|
|
|
|
device_unregister(&css->pseudo_subchannel->dev);
|
2008-09-09 10:38:57 +00:00
|
|
|
css->pseudo_subchannel = NULL;
|
2008-07-14 07:58:57 +00:00
|
|
|
if (css_chsc_characteristics.secm)
|
2007-10-12 14:11:13 +00:00
|
|
|
device_remove_file(&css->device,
|
2006-03-24 11:15:14 +00:00
|
|
|
&dev_attr_cm_enable);
|
2007-10-12 14:11:13 +00:00
|
|
|
device_unregister(&css->device);
|
2006-01-06 08:19:23 +00:00
|
|
|
}
|
2006-01-06 08:19:25 +00:00
|
|
|
out_bus:
|
2005-04-16 22:20:36 +00:00
|
|
|
bus_unregister(&css_bus_type);
|
|
|
|
out:
|
2009-03-26 14:24:01 +00:00
|
|
|
crw_unregister_handler(CRW_RSC_CSS);
|
2007-07-27 10:29:21 +00:00
|
|
|
chsc_free_sei_area();
|
|
|
|
kfree(slow_subchannel_set);
|
2008-12-25 12:39:36 +00:00
|
|
|
pr_alert("The CSS device driver initialization failed with "
|
|
|
|
"errno=%d\n", ret);
|
2005-04-16 22:20:36 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-12-08 14:54:28 +00:00
|
|
|
int sch_is_pseudo_sch(struct subchannel *sch)
|
|
|
|
{
|
|
|
|
return sch == to_css(sch->dev.parent)->pseudo_subchannel;
|
|
|
|
}
|
|
|
|
|
2008-07-14 07:59:03 +00:00
|
|
|
static int css_bus_match(struct device *dev, struct device_driver *drv)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-01-26 13:10:38 +00:00
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct css_driver *driver = to_cssdriver(drv);
|
2008-07-14 07:59:03 +00:00
|
|
|
struct css_device_id *id;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-07-14 07:59:03 +00:00
|
|
|
for (id = driver->subchannel_type; id->match_flags; id++) {
|
|
|
|
if (sch->st == id->type)
|
|
|
|
return 1;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:40 +00:00
|
|
|
static int css_probe(struct device *dev)
|
2006-01-11 09:56:22 +00:00
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
2008-01-26 13:10:40 +00:00
|
|
|
int ret;
|
2006-01-11 09:56:22 +00:00
|
|
|
|
|
|
|
sch = to_subchannel(dev);
|
2008-01-26 13:10:38 +00:00
|
|
|
sch->driver = to_cssdriver(dev->driver);
|
2008-01-26 13:10:40 +00:00
|
|
|
ret = sch->driver->probe ? sch->driver->probe(sch) : 0;
|
|
|
|
if (ret)
|
|
|
|
sch->driver = NULL;
|
|
|
|
return ret;
|
2006-01-11 09:56:22 +00:00
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:40 +00:00
|
|
|
static int css_remove(struct device *dev)
|
2006-01-11 09:56:22 +00:00
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
2008-01-26 13:10:40 +00:00
|
|
|
int ret;
|
2006-01-11 09:56:22 +00:00
|
|
|
|
|
|
|
sch = to_subchannel(dev);
|
2008-01-26 13:10:40 +00:00
|
|
|
ret = sch->driver->remove ? sch->driver->remove(sch) : 0;
|
|
|
|
sch->driver = NULL;
|
|
|
|
return ret;
|
2006-01-11 09:56:22 +00:00
|
|
|
}
|
|
|
|
|
2008-01-26 13:10:40 +00:00
|
|
|
static void css_shutdown(struct device *dev)
|
2006-01-11 09:56:22 +00:00
|
|
|
{
|
|
|
|
struct subchannel *sch;
|
|
|
|
|
|
|
|
sch = to_subchannel(dev);
|
2008-01-26 13:10:40 +00:00
|
|
|
if (sch->driver && sch->driver->shutdown)
|
2006-01-11 09:56:22 +00:00
|
|
|
sch->driver->shutdown(sch);
|
|
|
|
}
|
|
|
|
|
2008-07-14 07:58:44 +00:00
|
|
|
static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = add_uevent_var(env, "ST=%01X", sch->st);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2009-06-16 08:30:22 +00:00
|
|
|
static int css_pm_prepare(struct device *dev)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct css_driver *drv;
|
|
|
|
|
|
|
|
if (mutex_is_locked(&sch->reg_mutex))
|
|
|
|
return -EAGAIN;
|
|
|
|
if (!sch->dev.driver)
|
|
|
|
return 0;
|
|
|
|
drv = to_cssdriver(sch->dev.driver);
|
|
|
|
/* Notify drivers that they may not register children. */
|
|
|
|
return drv->prepare ? drv->prepare(sch) : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void css_pm_complete(struct device *dev)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct css_driver *drv;
|
|
|
|
|
|
|
|
if (!sch->dev.driver)
|
|
|
|
return;
|
|
|
|
drv = to_cssdriver(sch->dev.driver);
|
|
|
|
if (drv->complete)
|
|
|
|
drv->complete(sch);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int css_pm_freeze(struct device *dev)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct css_driver *drv;
|
|
|
|
|
|
|
|
if (!sch->dev.driver)
|
|
|
|
return 0;
|
|
|
|
drv = to_cssdriver(sch->dev.driver);
|
|
|
|
return drv->freeze ? drv->freeze(sch) : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int css_pm_thaw(struct device *dev)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct css_driver *drv;
|
|
|
|
|
|
|
|
if (!sch->dev.driver)
|
|
|
|
return 0;
|
|
|
|
drv = to_cssdriver(sch->dev.driver);
|
|
|
|
return drv->thaw ? drv->thaw(sch) : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int css_pm_restore(struct device *dev)
|
|
|
|
{
|
|
|
|
struct subchannel *sch = to_subchannel(dev);
|
|
|
|
struct css_driver *drv;
|
|
|
|
|
|
|
|
if (!sch->dev.driver)
|
|
|
|
return 0;
|
|
|
|
drv = to_cssdriver(sch->dev.driver);
|
|
|
|
return drv->restore ? drv->restore(sch) : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct dev_pm_ops css_pm_ops = {
|
|
|
|
.prepare = css_pm_prepare,
|
|
|
|
.complete = css_pm_complete,
|
|
|
|
.freeze = css_pm_freeze,
|
|
|
|
.thaw = css_pm_thaw,
|
|
|
|
.restore = css_pm_restore,
|
|
|
|
};
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
struct bus_type css_bus_type = {
|
2006-01-11 09:56:22 +00:00
|
|
|
.name = "css",
|
|
|
|
.match = css_bus_match,
|
|
|
|
.probe = css_probe,
|
|
|
|
.remove = css_remove,
|
|
|
|
.shutdown = css_shutdown,
|
2008-07-14 07:58:44 +00:00
|
|
|
.uevent = css_uevent,
|
2009-06-16 08:30:22 +00:00
|
|
|
.pm = &css_pm_ops,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2008-01-26 13:10:41 +00:00
|
|
|
/**
|
|
|
|
* css_driver_register - register a css driver
|
|
|
|
* @cdrv: css driver to register
|
|
|
|
*
|
|
|
|
* This is mainly a wrapper around driver_register that sets name
|
|
|
|
* and bus_type in the embedded struct device_driver correctly.
|
|
|
|
*/
|
|
|
|
int css_driver_register(struct css_driver *cdrv)
|
|
|
|
{
|
|
|
|
cdrv->drv.name = cdrv->name;
|
|
|
|
cdrv->drv.bus = &css_bus_type;
|
2008-01-26 13:10:47 +00:00
|
|
|
cdrv->drv.owner = cdrv->owner;
|
2008-01-26 13:10:41 +00:00
|
|
|
return driver_register(&cdrv->drv);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(css_driver_register);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* css_driver_unregister - unregister a css driver
|
|
|
|
* @cdrv: css driver to unregister
|
|
|
|
*
|
|
|
|
* This is a wrapper around driver_unregister.
|
|
|
|
*/
|
|
|
|
void css_driver_unregister(struct css_driver *cdrv)
|
|
|
|
{
|
|
|
|
driver_unregister(&cdrv->drv);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(css_driver_unregister);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
subsys_initcall(init_channel_subsystem);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
EXPORT_SYMBOL(css_bus_type);
|