2007-04-27 14:01:28 +00:00
|
|
|
/*
|
|
|
|
* drivers/s390/cio/chp.c
|
|
|
|
*
|
|
|
|
* Copyright IBM Corp. 1999,2007
|
|
|
|
* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
|
|
|
|
* Arnd Bergmann (arndb@de.ibm.com)
|
|
|
|
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/bug.h>
|
|
|
|
#include <linux/workqueue.h>
|
|
|
|
#include <linux/spinlock.h>
|
2007-04-27 14:01:31 +00:00
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/jiffies.h>
|
|
|
|
#include <linux/wait.h>
|
|
|
|
#include <linux/mutex.h>
|
2007-04-27 14:01:28 +00:00
|
|
|
#include <asm/errno.h>
|
2007-04-27 14:01:31 +00:00
|
|
|
#include <asm/chpid.h>
|
|
|
|
#include <asm/sclp.h>
|
2007-04-27 14:01:28 +00:00
|
|
|
|
|
|
|
#include "cio.h"
|
|
|
|
#include "css.h"
|
|
|
|
#include "ioasm.h"
|
|
|
|
#include "cio_debug.h"
|
|
|
|
#include "chp.h"
|
|
|
|
|
|
|
|
#define to_channelpath(device) container_of(device, struct channel_path, dev)
|
2007-04-27 14:01:31 +00:00
|
|
|
#define CHP_INFO_UPDATE_INTERVAL 1*HZ
|
|
|
|
|
|
|
|
enum cfg_task_t {
|
|
|
|
cfg_none,
|
|
|
|
cfg_configure,
|
|
|
|
cfg_deconfigure
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Map for pending configure tasks. */
|
|
|
|
static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1];
|
|
|
|
static DEFINE_MUTEX(cfg_lock);
|
|
|
|
static int cfg_busy;
|
|
|
|
|
|
|
|
/* Map for channel-path status. */
|
|
|
|
static struct sclp_chp_info chp_info;
|
|
|
|
static DEFINE_MUTEX(info_lock);
|
|
|
|
|
|
|
|
/* Time after which channel-path status may be outdated. */
|
|
|
|
static unsigned long chp_info_expires;
|
|
|
|
|
|
|
|
/* Workqueue to perform pending configure tasks. */
|
|
|
|
static struct workqueue_struct *chp_wq;
|
|
|
|
static struct work_struct cfg_work;
|
|
|
|
|
|
|
|
/* Wait queue for configure completion events. */
|
|
|
|
static wait_queue_head_t cfg_wait_queue;
|
2007-04-27 14:01:28 +00:00
|
|
|
|
|
|
|
/* Return channel_path struct for given chpid. */
|
|
|
|
static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
return css[chpid.cssid]->chps[chpid.id];
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set vary state for given chpid. */
|
|
|
|
static void set_chp_logically_online(struct chp_id chpid, int onoff)
|
|
|
|
{
|
|
|
|
chpid_to_chp(chpid)->state = onoff;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* On succes return 0 if channel-path is varied offline, 1 if it is varied
|
|
|
|
* online. Return -ENODEV if channel-path is not registered. */
|
|
|
|
int chp_get_status(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_get_sch_opm - return opm for subchannel
|
|
|
|
* @sch: subchannel
|
|
|
|
*
|
|
|
|
* Calculate and return the operational path mask (opm) based on the chpids
|
|
|
|
* used by the subchannel and the status of the associated channel-paths.
|
|
|
|
*/
|
|
|
|
u8 chp_get_sch_opm(struct subchannel *sch)
|
|
|
|
{
|
|
|
|
struct chp_id chpid;
|
|
|
|
int opm;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
opm = 0;
|
|
|
|
chp_id_init(&chpid);
|
|
|
|
for (i=0; i < 8; i++) {
|
|
|
|
opm <<= 1;
|
|
|
|
chpid.id = sch->schib.pmcw.chpid[i];
|
|
|
|
if (chp_get_status(chpid) != 0)
|
|
|
|
opm |= 1;
|
|
|
|
}
|
|
|
|
return opm;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_is_registered - check if a channel-path is registered
|
|
|
|
* @chpid: channel-path ID
|
|
|
|
*
|
|
|
|
* Return non-zero if a channel-path with the given chpid is registered,
|
|
|
|
* zero otherwise.
|
|
|
|
*/
|
|
|
|
int chp_is_registered(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
return chpid_to_chp(chpid) != NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Function: s390_vary_chpid
|
|
|
|
* Varies the specified chpid online or offline
|
|
|
|
*/
|
|
|
|
static int s390_vary_chpid(struct chp_id chpid, int on)
|
|
|
|
{
|
|
|
|
char dbf_text[15];
|
|
|
|
int status;
|
|
|
|
|
|
|
|
sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid,
|
|
|
|
chpid.id);
|
|
|
|
CIO_TRACE_EVENT( 2, dbf_text);
|
|
|
|
|
|
|
|
status = chp_get_status(chpid);
|
|
|
|
if (status < 0) {
|
|
|
|
printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n",
|
|
|
|
chpid.cssid, chpid.id);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!on && !status) {
|
|
|
|
printk(KERN_ERR "chpid %x.%02x is already offline\n",
|
|
|
|
chpid.cssid, chpid.id);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
set_chp_logically_online(chpid, on);
|
|
|
|
chsc_chp_vary(chpid, on);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Channel measurement related functions
|
|
|
|
*/
|
|
|
|
static ssize_t chp_measurement_chars_read(struct kobject *kobj, char *buf,
|
|
|
|
loff_t off, size_t count)
|
|
|
|
{
|
|
|
|
struct channel_path *chp;
|
|
|
|
unsigned int size;
|
|
|
|
|
|
|
|
chp = to_channelpath(container_of(kobj, struct device, kobj));
|
|
|
|
if (!chp->cmg_chars)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
size = sizeof(struct cmg_chars);
|
|
|
|
|
|
|
|
if (off > size)
|
|
|
|
return 0;
|
|
|
|
if (off + count > size)
|
|
|
|
count = size - off;
|
|
|
|
memcpy(buf, chp->cmg_chars + off, count);
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct bin_attribute chp_measurement_chars_attr = {
|
|
|
|
.attr = {
|
|
|
|
.name = "measurement_chars",
|
|
|
|
.mode = S_IRUSR,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
.size = sizeof(struct cmg_chars),
|
|
|
|
.read = chp_measurement_chars_read,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void chp_measurement_copy_block(struct cmg_entry *buf,
|
|
|
|
struct channel_subsystem *css,
|
|
|
|
struct chp_id chpid)
|
|
|
|
{
|
|
|
|
void *area;
|
|
|
|
struct cmg_entry *entry, reference_buf;
|
|
|
|
int idx;
|
|
|
|
|
|
|
|
if (chpid.id < 128) {
|
|
|
|
area = css->cub_addr1;
|
|
|
|
idx = chpid.id;
|
|
|
|
} else {
|
|
|
|
area = css->cub_addr2;
|
|
|
|
idx = chpid.id - 128;
|
|
|
|
}
|
|
|
|
entry = area + (idx * sizeof(struct cmg_entry));
|
|
|
|
do {
|
|
|
|
memcpy(buf, entry, sizeof(*entry));
|
|
|
|
memcpy(&reference_buf, entry, sizeof(*entry));
|
|
|
|
} while (reference_buf.values[0] != buf->values[0]);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t chp_measurement_read(struct kobject *kobj, char *buf,
|
|
|
|
loff_t off, size_t count)
|
|
|
|
{
|
|
|
|
struct channel_path *chp;
|
|
|
|
struct channel_subsystem *css;
|
|
|
|
unsigned int size;
|
|
|
|
|
|
|
|
chp = to_channelpath(container_of(kobj, struct device, kobj));
|
|
|
|
css = to_css(chp->dev.parent);
|
|
|
|
|
|
|
|
size = sizeof(struct cmg_entry);
|
|
|
|
|
|
|
|
/* Only allow single reads. */
|
|
|
|
if (off || count < size)
|
|
|
|
return 0;
|
|
|
|
chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid);
|
|
|
|
count = size;
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct bin_attribute chp_measurement_attr = {
|
|
|
|
.attr = {
|
|
|
|
.name = "measurement",
|
|
|
|
.mode = S_IRUSR,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
.size = sizeof(struct cmg_entry),
|
|
|
|
.read = chp_measurement_read,
|
|
|
|
};
|
|
|
|
|
|
|
|
void chp_remove_cmg_attr(struct channel_path *chp)
|
|
|
|
{
|
|
|
|
device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
|
|
|
|
device_remove_bin_file(&chp->dev, &chp_measurement_attr);
|
|
|
|
}
|
|
|
|
|
|
|
|
int chp_add_cmg_attr(struct channel_path *chp)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
ret = device_create_bin_file(&chp->dev, &chp_measurement_attr);
|
|
|
|
if (ret)
|
|
|
|
device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Files for the channel path entries.
|
|
|
|
*/
|
|
|
|
static ssize_t chp_status_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct channel_path *chp = container_of(dev, struct channel_path, dev);
|
|
|
|
|
|
|
|
if (!chp)
|
|
|
|
return 0;
|
|
|
|
return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") :
|
|
|
|
sprintf(buf, "offline\n"));
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t chp_status_write(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct channel_path *cp = container_of(dev, struct channel_path, dev);
|
|
|
|
char cmd[10];
|
|
|
|
int num_args;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
num_args = sscanf(buf, "%5s", cmd);
|
|
|
|
if (!num_args)
|
|
|
|
return count;
|
|
|
|
|
|
|
|
if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1"))
|
|
|
|
error = s390_vary_chpid(cp->chpid, 1);
|
|
|
|
else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0"))
|
|
|
|
error = s390_vary_chpid(cp->chpid, 0);
|
|
|
|
else
|
|
|
|
error = -EINVAL;
|
|
|
|
|
|
|
|
return error < 0 ? error : count;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
|
|
|
|
|
2007-04-27 14:01:31 +00:00
|
|
|
static ssize_t chp_configure_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct channel_path *cp;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
cp = container_of(dev, struct channel_path, dev);
|
|
|
|
status = chp_info_get_status(cp->chpid);
|
|
|
|
if (status < 0)
|
|
|
|
return status;
|
|
|
|
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", status);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cfg_wait_idle(void);
|
|
|
|
|
|
|
|
static ssize_t chp_configure_write(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct channel_path *cp;
|
|
|
|
int val;
|
|
|
|
char delim;
|
|
|
|
|
|
|
|
if (sscanf(buf, "%d %c", &val, &delim) != 1)
|
|
|
|
return -EINVAL;
|
|
|
|
if (val != 0 && val != 1)
|
|
|
|
return -EINVAL;
|
|
|
|
cp = container_of(dev, struct channel_path, dev);
|
|
|
|
chp_cfg_schedule(cp->chpid, val);
|
|
|
|
cfg_wait_idle();
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write);
|
|
|
|
|
2007-04-27 14:01:28 +00:00
|
|
|
static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct channel_path *chp = container_of(dev, struct channel_path, dev);
|
|
|
|
|
|
|
|
if (!chp)
|
|
|
|
return 0;
|
|
|
|
return sprintf(buf, "%x\n", chp->desc.desc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
|
|
|
|
|
|
|
|
static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct channel_path *chp = to_channelpath(dev);
|
|
|
|
|
|
|
|
if (!chp)
|
|
|
|
return 0;
|
|
|
|
if (chp->cmg == -1) /* channel measurements not available */
|
|
|
|
return sprintf(buf, "unknown\n");
|
|
|
|
return sprintf(buf, "%x\n", chp->cmg);
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);
|
|
|
|
|
|
|
|
static ssize_t chp_shared_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct channel_path *chp = to_channelpath(dev);
|
|
|
|
|
|
|
|
if (!chp)
|
|
|
|
return 0;
|
|
|
|
if (chp->shared == -1) /* channel measurements not available */
|
|
|
|
return sprintf(buf, "unknown\n");
|
|
|
|
return sprintf(buf, "%x\n", chp->shared);
|
|
|
|
}
|
|
|
|
|
|
|
|
static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);
|
|
|
|
|
|
|
|
static struct attribute * chp_attrs[] = {
|
|
|
|
&dev_attr_status.attr,
|
2007-04-27 14:01:31 +00:00
|
|
|
&dev_attr_configure.attr,
|
2007-04-27 14:01:28 +00:00
|
|
|
&dev_attr_type.attr,
|
|
|
|
&dev_attr_cmg.attr,
|
|
|
|
&dev_attr_shared.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group chp_attr_group = {
|
|
|
|
.attrs = chp_attrs,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void chp_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct channel_path *cp;
|
|
|
|
|
|
|
|
cp = container_of(dev, struct channel_path, dev);
|
|
|
|
kfree(cp);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_new - register a new channel-path
|
|
|
|
* @chpid - channel-path ID
|
|
|
|
*
|
|
|
|
* Create and register data structure representing new channel-path. Return
|
|
|
|
* zero on success, non-zero otherwise.
|
|
|
|
*/
|
|
|
|
int chp_new(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
struct channel_path *chp;
|
|
|
|
int ret;
|
|
|
|
|
2007-04-27 14:01:31 +00:00
|
|
|
if (chp_is_registered(chpid))
|
|
|
|
return 0;
|
2007-04-27 14:01:28 +00:00
|
|
|
chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
|
|
|
|
if (!chp)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
/* fill in status, etc. */
|
|
|
|
chp->chpid = chpid;
|
|
|
|
chp->state = 1;
|
|
|
|
chp->dev.parent = &css[chpid.cssid]->device;
|
|
|
|
chp->dev.release = chp_release;
|
|
|
|
snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid,
|
|
|
|
chpid.id);
|
|
|
|
|
|
|
|
/* Obtain channel path description and fill it in. */
|
|
|
|
ret = chsc_determine_channel_path_description(chpid, &chp->desc);
|
|
|
|
if (ret)
|
|
|
|
goto out_free;
|
2007-04-27 14:01:29 +00:00
|
|
|
if ((chp->desc.flags & 0x80) == 0) {
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto out_free;
|
|
|
|
}
|
2007-04-27 14:01:28 +00:00
|
|
|
/* Get channel-measurement characteristics. */
|
|
|
|
if (css_characteristics_avail && css_chsc_characteristics.scmc
|
|
|
|
&& css_chsc_characteristics.secm) {
|
|
|
|
ret = chsc_get_channel_measurement_chars(chp);
|
|
|
|
if (ret)
|
|
|
|
goto out_free;
|
|
|
|
} else {
|
|
|
|
static int msg_done;
|
|
|
|
|
|
|
|
if (!msg_done) {
|
|
|
|
printk(KERN_WARNING "cio: Channel measurements not "
|
|
|
|
"available, continuing.\n");
|
|
|
|
msg_done = 1;
|
|
|
|
}
|
|
|
|
chp->cmg = -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* make it known to the system */
|
|
|
|
ret = device_register(&chp->dev);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_WARNING "%s: could not register %x.%02x\n",
|
|
|
|
__func__, chpid.cssid, chpid.id);
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
|
|
|
|
if (ret) {
|
|
|
|
device_unregister(&chp->dev);
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
mutex_lock(&css[chpid.cssid]->mutex);
|
|
|
|
if (css[chpid.cssid]->cm_enabled) {
|
|
|
|
ret = chp_add_cmg_attr(chp);
|
|
|
|
if (ret) {
|
|
|
|
sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
|
|
|
|
device_unregister(&chp->dev);
|
|
|
|
mutex_unlock(&css[chpid.cssid]->mutex);
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
css[chpid.cssid]->chps[chpid.id] = chp;
|
|
|
|
mutex_unlock(&css[chpid.cssid]->mutex);
|
|
|
|
return ret;
|
|
|
|
out_free:
|
|
|
|
kfree(chp);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_get_chp_desc - return newly allocated channel-path description
|
|
|
|
* @chpid: channel-path ID
|
|
|
|
*
|
|
|
|
* On success return a newly allocated copy of the channel-path description
|
|
|
|
* data associated with the given channel-path ID. Return %NULL on error.
|
|
|
|
*/
|
|
|
|
void *chp_get_chp_desc(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
struct channel_path *chp;
|
|
|
|
struct channel_path_desc *desc;
|
|
|
|
|
|
|
|
chp = chpid_to_chp(chpid);
|
|
|
|
if (!chp)
|
|
|
|
return NULL;
|
|
|
|
desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
|
|
|
|
if (!desc)
|
|
|
|
return NULL;
|
|
|
|
memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
|
|
|
|
return desc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_process_crw - process channel-path status change
|
|
|
|
* @id: channel-path ID number
|
|
|
|
* @status: non-zero if channel-path has become available, zero otherwise
|
|
|
|
*
|
|
|
|
* Handle channel-report-words indicating that the status of a channel-path
|
|
|
|
* has changed.
|
|
|
|
*/
|
2007-04-27 14:01:34 +00:00
|
|
|
void chp_process_crw(int id, int status)
|
2007-04-27 14:01:28 +00:00
|
|
|
{
|
|
|
|
struct chp_id chpid;
|
|
|
|
|
|
|
|
chp_id_init(&chpid);
|
|
|
|
chpid.id = id;
|
|
|
|
if (status) {
|
|
|
|
if (!chp_is_registered(chpid))
|
|
|
|
chp_new(chpid);
|
2007-04-27 14:01:34 +00:00
|
|
|
chsc_chp_online(chpid);
|
|
|
|
} else
|
2007-04-27 14:01:28 +00:00
|
|
|
chsc_chp_offline(chpid);
|
|
|
|
}
|
2007-04-27 14:01:31 +00:00
|
|
|
|
|
|
|
static inline int info_bit_num(struct chp_id id)
|
|
|
|
{
|
|
|
|
return id.id + id.cssid * (__MAX_CHPID + 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Force chp_info refresh on next call to info_validate(). */
|
|
|
|
static void info_expire(void)
|
|
|
|
{
|
|
|
|
mutex_lock(&info_lock);
|
|
|
|
chp_info_expires = jiffies - 1;
|
|
|
|
mutex_unlock(&info_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Ensure that chp_info is up-to-date. */
|
|
|
|
static int info_update(void)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
mutex_lock(&info_lock);
|
|
|
|
rc = 0;
|
|
|
|
if (time_after(jiffies, chp_info_expires)) {
|
|
|
|
/* Data is too old, update. */
|
|
|
|
rc = sclp_chp_read_info(&chp_info);
|
|
|
|
chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ;
|
|
|
|
}
|
|
|
|
mutex_unlock(&info_lock);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_info_get_status - retrieve configure status of a channel-path
|
|
|
|
* @chpid: channel-path ID
|
|
|
|
*
|
|
|
|
* On success, return 0 for standby, 1 for configured, 2 for reserved,
|
|
|
|
* 3 for not recognized. Return negative error code on error.
|
|
|
|
*/
|
|
|
|
int chp_info_get_status(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
int bit;
|
|
|
|
|
|
|
|
rc = info_update();
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
bit = info_bit_num(chpid);
|
|
|
|
mutex_lock(&info_lock);
|
|
|
|
if (!chp_test_bit(chp_info.recognized, bit))
|
|
|
|
rc = CHP_STATUS_NOT_RECOGNIZED;
|
|
|
|
else if (chp_test_bit(chp_info.configured, bit))
|
|
|
|
rc = CHP_STATUS_CONFIGURED;
|
|
|
|
else if (chp_test_bit(chp_info.standby, bit))
|
|
|
|
rc = CHP_STATUS_STANDBY;
|
|
|
|
else
|
|
|
|
rc = CHP_STATUS_RESERVED;
|
|
|
|
mutex_unlock(&info_lock);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return configure task for chpid. */
|
|
|
|
static enum cfg_task_t cfg_get_task(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
return chp_cfg_task[chpid.cssid][chpid.id];
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set configure task for chpid. */
|
|
|
|
static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg)
|
|
|
|
{
|
|
|
|
chp_cfg_task[chpid.cssid][chpid.id] = cfg;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Perform one configure/deconfigure request. Reschedule work function until
|
|
|
|
* last request. */
|
|
|
|
static void cfg_func(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct chp_id chpid;
|
|
|
|
enum cfg_task_t t;
|
|
|
|
|
|
|
|
mutex_lock(&cfg_lock);
|
|
|
|
t = cfg_none;
|
|
|
|
chp_id_for_each(&chpid) {
|
|
|
|
t = cfg_get_task(chpid);
|
|
|
|
if (t != cfg_none) {
|
|
|
|
cfg_set_task(chpid, cfg_none);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
mutex_unlock(&cfg_lock);
|
|
|
|
|
|
|
|
switch (t) {
|
|
|
|
case cfg_configure:
|
|
|
|
sclp_chp_configure(chpid);
|
|
|
|
info_expire();
|
|
|
|
chsc_chp_online(chpid);
|
|
|
|
break;
|
|
|
|
case cfg_deconfigure:
|
|
|
|
sclp_chp_deconfigure(chpid);
|
|
|
|
info_expire();
|
|
|
|
chsc_chp_offline(chpid);
|
|
|
|
break;
|
|
|
|
case cfg_none:
|
|
|
|
/* Get updated information after last change. */
|
|
|
|
info_update();
|
|
|
|
mutex_lock(&cfg_lock);
|
|
|
|
cfg_busy = 0;
|
|
|
|
mutex_unlock(&cfg_lock);
|
|
|
|
wake_up_interruptible(&cfg_wait_queue);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
queue_work(chp_wq, &cfg_work);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_cfg_schedule - schedule chpid configuration request
|
|
|
|
* @chpid - channel-path ID
|
|
|
|
* @configure - Non-zero for configure, zero for deconfigure
|
|
|
|
*
|
|
|
|
* Schedule a channel-path configuration/deconfiguration request.
|
|
|
|
*/
|
|
|
|
void chp_cfg_schedule(struct chp_id chpid, int configure)
|
|
|
|
{
|
|
|
|
CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id,
|
|
|
|
configure);
|
|
|
|
mutex_lock(&cfg_lock);
|
|
|
|
cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure);
|
|
|
|
cfg_busy = 1;
|
|
|
|
mutex_unlock(&cfg_lock);
|
|
|
|
queue_work(chp_wq, &cfg_work);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request
|
|
|
|
* @chpid - channel-path ID
|
|
|
|
*
|
|
|
|
* Cancel an active channel-path deconfiguration request if it has not yet
|
|
|
|
* been performed.
|
|
|
|
*/
|
|
|
|
void chp_cfg_cancel_deconfigure(struct chp_id chpid)
|
|
|
|
{
|
|
|
|
CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id);
|
|
|
|
mutex_lock(&cfg_lock);
|
|
|
|
if (cfg_get_task(chpid) == cfg_deconfigure)
|
|
|
|
cfg_set_task(chpid, cfg_none);
|
|
|
|
mutex_unlock(&cfg_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cfg_wait_idle(void)
|
|
|
|
{
|
|
|
|
if (wait_event_interruptible(cfg_wait_queue, !cfg_busy))
|
|
|
|
return -ERESTARTSYS;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init chp_init(void)
|
|
|
|
{
|
|
|
|
struct chp_id chpid;
|
|
|
|
|
|
|
|
chp_wq = create_singlethread_workqueue("cio_chp");
|
|
|
|
if (!chp_wq)
|
|
|
|
return -ENOMEM;
|
|
|
|
INIT_WORK(&cfg_work, cfg_func);
|
|
|
|
init_waitqueue_head(&cfg_wait_queue);
|
|
|
|
if (info_update())
|
|
|
|
return 0;
|
|
|
|
/* Register available channel-paths. */
|
|
|
|
chp_id_for_each(&chpid) {
|
|
|
|
if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED)
|
|
|
|
chp_new(chpid);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
subsys_initcall(chp_init);
|