Commit 823d494a authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
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[S390] pm: ccw bus power management callbacks


Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 03347e25
/*
* include/asm-s390/ccwdev.h
* include/asm-s390x/ccwdev.h
* Copyright IBM Corp. 2002, 2009
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Arnd Bergmann <arndb@de.ibm.com>
* Author(s): Arnd Bergmann <arndb@de.ibm.com>
*
* Interface for CCW device drivers
* Interface for CCW device drivers
*/
#ifndef _S390_CCWDEV_H_
#define _S390_CCWDEV_H_
......@@ -104,6 +102,11 @@ struct ccw_device {
* @set_offline: called when setting device offline
* @notify: notify driver of device state changes
* @shutdown: called at device shutdown
* @prepare: prepare for pm state transition
* @complete: undo work done in @prepare
* @freeze: callback for freezing during hibernation snapshotting
* @thaw: undo work done in @freeze
* @restore: callback for restoring after hibernation
* @driver: embedded device driver structure
* @name: device driver name
*/
......@@ -116,6 +119,11 @@ struct ccw_driver {
int (*set_offline) (struct ccw_device *);
int (*notify) (struct ccw_device *, int);
void (*shutdown) (struct ccw_device *);
int (*prepare) (struct ccw_device *);
void (*complete) (struct ccw_device *);
int (*freeze)(struct ccw_device *);
int (*thaw) (struct ccw_device *);
int (*restore)(struct ccw_device *);
struct device_driver driver;
char *name;
};
......
......@@ -1204,6 +1204,11 @@ static ssize_t cmb_enable_store(struct device *dev,
DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store);
int ccw_set_cmf(struct ccw_device *cdev, int enable)
{
return cmbops->set(cdev, enable ? 2 : 0);
}
/**
* enable_cmf() - switch on the channel measurement for a specific device
* @cdev: The ccw device to be enabled
......
......@@ -1895,6 +1895,242 @@ static void ccw_device_shutdown(struct device *dev)
disable_cmf(cdev);
}
static int ccw_device_pm_prepare(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
if (work_pending(&cdev->private->kick_work))
return -EAGAIN;
/* Fail while device is being set online/offline. */
if (atomic_read(&cdev->private->onoff))
return -EAGAIN;
if (cdev->online && cdev->drv && cdev->drv->prepare)
return cdev->drv->prepare(cdev);
return 0;
}
static void ccw_device_pm_complete(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
if (cdev->online && cdev->drv && cdev->drv->complete)
cdev->drv->complete(cdev);
}
static int ccw_device_pm_freeze(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int ret, cm_enabled;
/* Fail suspend while device is in transistional state. */
if (!dev_fsm_final_state(cdev))
return -EAGAIN;
if (!cdev->online)
return 0;
if (cdev->drv && cdev->drv->freeze) {
ret = cdev->drv->freeze(cdev);
if (ret)
return ret;
}
spin_lock_irq(sch->lock);
cm_enabled = cdev->private->cmb != NULL;
spin_unlock_irq(sch->lock);
if (cm_enabled) {
/* Don't have the css write on memory. */
ret = ccw_set_cmf(cdev, 0);
if (ret)
return ret;
}
/* From here on, disallow device driver I/O. */
spin_lock_irq(sch->lock);
ret = cio_disable_subchannel(sch);
spin_unlock_irq(sch->lock);
return ret;
}
static int ccw_device_pm_thaw(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int ret, cm_enabled;
if (!cdev->online)
return 0;
spin_lock_irq(sch->lock);
/* Allow device driver I/O again. */
ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
cm_enabled = cdev->private->cmb != NULL;
spin_unlock_irq(sch->lock);
if (ret)
return ret;
if (cm_enabled) {
ret = ccw_set_cmf(cdev, 1);
if (ret)
return ret;
}
if (cdev->drv && cdev->drv->thaw)
ret = cdev->drv->thaw(cdev);
return ret;
}
static void __ccw_device_pm_restore(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int ret;
if (cio_is_console(sch->schid))
goto out;
/*
* While we were sleeping, devices may have gone or become
* available again. Kick re-detection.
*/
spin_lock_irq(sch->lock);
cdev->private->flags.resuming = 1;
ret = ccw_device_recognition(cdev);
spin_unlock_irq(sch->lock);
if (ret) {
CIO_MSG_EVENT(0, "Couldn't start recognition for device "
"%s (ret=%d)\n", dev_name(&cdev->dev), ret);
spin_lock_irq(sch->lock);
cdev->private->state = DEV_STATE_DISCONNECTED;
spin_unlock_irq(sch->lock);
/* notify driver after the resume cb */
goto out;
}
wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
cdev->private->state == DEV_STATE_DISCONNECTED);
out:
cdev->private->flags.resuming = 0;
}
static int resume_handle_boxed(struct ccw_device *cdev)
{
cdev->private->state = DEV_STATE_BOXED;
if (ccw_device_notify(cdev, CIO_BOXED))
return 0;
ccw_device_schedule_sch_unregister(cdev);
return -ENODEV;
}
static int resume_handle_disc(struct ccw_device *cdev)
{
cdev->private->state = DEV_STATE_DISCONNECTED;
if (ccw_device_notify(cdev, CIO_GONE))
return 0;
ccw_device_schedule_sch_unregister(cdev);
return -ENODEV;
}
static int ccw_device_pm_restore(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int ret = 0, cm_enabled;
__ccw_device_pm_restore(cdev);
spin_lock_irq(sch->lock);
if (cio_is_console(sch->schid)) {
cio_enable_subchannel(sch, (u32)(addr_t)sch);
spin_unlock_irq(sch->lock);
goto out_restore;
}
cdev->private->flags.donotify = 0;
/* check recognition results */
switch (cdev->private->state) {
case DEV_STATE_OFFLINE:
break;
case DEV_STATE_BOXED:
ret = resume_handle_boxed(cdev);
spin_unlock_irq(sch->lock);
if (ret)
goto out;
goto out_restore;
case DEV_STATE_DISCONNECTED:
goto out_disc_unlock;
default:
goto out_unreg_unlock;
}
/* check if the device id has changed */
if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
CIO_MSG_EVENT(0, "resume: sch %s: failed (devno changed from "
"%04x to %04x)\n", dev_name(&sch->dev),
cdev->private->dev_id.devno,
sch->schib.pmcw.dev);
goto out_unreg_unlock;
}
/* check if the device type has changed */
if (!ccw_device_test_sense_data(cdev)) {
ccw_device_update_sense_data(cdev);
PREPARE_WORK(&cdev->private->kick_work,
ccw_device_do_unbind_bind);
queue_work(ccw_device_work, &cdev->private->kick_work);
ret = -ENODEV;
goto out_unlock;
}
if (!cdev->online) {
ret = 0;
goto out_unlock;
}
ret = ccw_device_online(cdev);
if (ret)
goto out_disc_unlock;
cm_enabled = cdev->private->cmb != NULL;
spin_unlock_irq(sch->lock);
wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
if (cdev->private->state != DEV_STATE_ONLINE) {
spin_lock_irq(sch->lock);
goto out_disc_unlock;
}
if (cm_enabled) {
ret = ccw_set_cmf(cdev, 1);
if (ret) {
CIO_MSG_EVENT(2, "resume: cdev %s: cmf failed "
"(rc=%d)\n", dev_name(&cdev->dev), ret);
ret = 0;
}
}
out_restore:
if (cdev->online && cdev->drv && cdev->drv->restore)
ret = cdev->drv->restore(cdev);
out:
return ret;
out_disc_unlock:
ret = resume_handle_disc(cdev);
spin_unlock_irq(sch->lock);
if (ret)
return ret;
goto out_restore;
out_unreg_unlock:
ccw_device_schedule_sch_unregister(cdev);
ret = -ENODEV;
out_unlock:
spin_unlock_irq(sch->lock);
return ret;
}
static struct dev_pm_ops ccw_pm_ops = {
.prepare = ccw_device_pm_prepare,
.complete = ccw_device_pm_complete,
.freeze = ccw_device_pm_freeze,
.thaw = ccw_device_pm_thaw,
.restore = ccw_device_pm_restore,
};
struct bus_type ccw_bus_type = {
.name = "ccw",
.match = ccw_bus_match,
......@@ -1902,6 +2138,7 @@ struct bus_type ccw_bus_type = {
.probe = ccw_device_probe,
.remove = ccw_device_remove,
.shutdown = ccw_device_shutdown,
.pm = &ccw_pm_ops,
};
/**
......
......@@ -87,6 +87,8 @@ int ccw_device_is_orphan(struct ccw_device *);
int ccw_device_recognition(struct ccw_device *);
int ccw_device_online(struct ccw_device *);
int ccw_device_offline(struct ccw_device *);
void ccw_device_update_sense_data(struct ccw_device *);
int ccw_device_test_sense_data(struct ccw_device *);
void ccw_device_schedule_sch_unregister(struct ccw_device *);
int ccw_purge_blacklisted(void);
......@@ -133,5 +135,6 @@ extern struct bus_type ccw_bus_type;
void retry_set_schib(struct ccw_device *cdev);
void cmf_retry_copy_block(struct ccw_device *);
int cmf_reenable(struct ccw_device *);
int ccw_set_cmf(struct ccw_device *cdev, int enable);
extern struct device_attribute dev_attr_cmb_enable;
#endif
......@@ -177,29 +177,21 @@ ccw_device_cancel_halt_clear(struct ccw_device *cdev)
panic("Can't stop i/o on subchannel.\n");
}
static int
ccw_device_handle_oper(struct ccw_device *cdev)
void ccw_device_update_sense_data(struct ccw_device *cdev)
{
struct subchannel *sch;
memset(&cdev->id, 0, sizeof(cdev->id));
cdev->id.cu_type = cdev->private->senseid.cu_type;
cdev->id.cu_model = cdev->private->senseid.cu_model;
cdev->id.dev_type = cdev->private->senseid.dev_type;
cdev->id.dev_model = cdev->private->senseid.dev_model;
}
sch = to_subchannel(cdev->dev.parent);
cdev->private->flags.recog_done = 1;
/*
* Check if cu type and device type still match. If
* not, it is certainly another device and we have to
* de- and re-register.
*/
if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
cdev->id.cu_model != cdev->private->senseid.cu_model ||
cdev->id.dev_type != cdev->private->senseid.dev_type ||
cdev->id.dev_model != cdev->private->senseid.dev_model) {
PREPARE_WORK(&cdev->private->kick_work,
ccw_device_do_unbind_bind);
queue_work(ccw_device_work, &cdev->private->kick_work);
return 0;
}
cdev->private->flags.donotify = 1;
return 1;
int ccw_device_test_sense_data(struct ccw_device *cdev)
{
return cdev->id.cu_type == cdev->private->senseid.cu_type &&
cdev->id.cu_model == cdev->private->senseid.cu_model &&
cdev->id.dev_type == cdev->private->senseid.dev_type &&
cdev->id.dev_model == cdev->private->senseid.dev_model;
}
/*
......@@ -233,7 +225,7 @@ static void
ccw_device_recog_done(struct ccw_device *cdev, int state)
{
struct subchannel *sch;
int notify, old_lpm, same_dev;
int old_lpm;
sch = to_subchannel(cdev->dev.parent);
......@@ -263,8 +255,12 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
wake_up(&cdev->private->wait_q);
return;
}
notify = 0;
same_dev = 0; /* Keep the compiler quiet... */
if (cdev->private->flags.resuming) {
cdev->private->state = state;
cdev->private->flags.recog_done = 1;
wake_up(&cdev->private->wait_q);
return;
}
switch (state) {
case DEV_STATE_NOT_OPER:
CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
......@@ -273,34 +269,31 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
sch->schid.ssid, sch->schid.sch_no);
break;
case DEV_STATE_OFFLINE:
if (cdev->online) {
same_dev = ccw_device_handle_oper(cdev);
notify = 1;
if (!cdev->online) {
ccw_device_update_sense_data(cdev);
/* Issue device info message. */
CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
"CU Type/Mod = %04X/%02X, Dev Type/Mod "
"= %04X/%02X\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno,
cdev->id.cu_type, cdev->id.cu_model,
cdev->id.dev_type, cdev->id.dev_model);
break;
}
/* fill out sense information */
memset(&cdev->id, 0, sizeof(cdev->id));
cdev->id.cu_type = cdev->private->senseid.cu_type;
cdev->id.cu_model = cdev->private->senseid.cu_model;
cdev->id.dev_type = cdev->private->senseid.dev_type;
cdev->id.dev_model = cdev->private->senseid.dev_model;
if (notify) {
cdev->private->state = DEV_STATE_OFFLINE;
if (same_dev) {
/* Get device online again. */
ccw_device_online(cdev);
wake_up(&cdev->private->wait_q);
}
return;
cdev->private->state = DEV_STATE_OFFLINE;
cdev->private->flags.recog_done = 1;
if (ccw_device_test_sense_data(cdev)) {
cdev->private->flags.donotify = 1;
ccw_device_online(cdev);
wake_up(&cdev->private->wait_q);
} else {
ccw_device_update_sense_data(cdev);
PREPARE_WORK(&cdev->private->kick_work,
ccw_device_do_unbind_bind);
queue_work(ccw_device_work, &cdev->private->kick_work);
}
/* Issue device info message. */
CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
"CU Type/Mod = %04X/%02X, Dev Type/Mod = "
"%04X/%02X\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno,
cdev->id.cu_type, cdev->id.cu_model,
cdev->id.dev_type, cdev->id.dev_model);
break;
return;
case DEV_STATE_BOXED:
CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
" subchannel 0.%x.%04x\n",
......@@ -502,9 +495,6 @@ ccw_device_recognition(struct ccw_device *cdev)
struct subchannel *sch;
int ret;
if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
(cdev->private->state != DEV_STATE_BOXED))
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
if (ret != 0)
......
/*
* drivers/s390/cio/device_ops.c
* Copyright IBM Corp. 2002, 2009
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
*/
#include <linux/module.h>
#include <linux/init.h>
......@@ -116,12 +114,15 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE &&
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
ret = cio_clear(sch);
if (ret == 0)
cdev->private->intparm = intparm;
......@@ -162,6 +163,8 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state == DEV_STATE_VERIFY ||
......@@ -337,12 +340,15 @@ int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE &&
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
ret = cio_halt(sch);
if (ret == 0)
cdev->private->intparm = intparm;
......@@ -369,6 +375,8 @@ int ccw_device_resume(struct ccw_device *cdev)
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE ||
......@@ -580,6 +588,8 @@ int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
int rc;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
/* Adjust requested path mask to excluded varied off paths. */
......@@ -669,6 +679,8 @@ int ccw_device_tm_intrg(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
if (!scsw_is_tm(&sch->schib.scsw) ||
......
......@@ -107,6 +107,7 @@ struct ccw_device_private {
unsigned int recog_done:1; /* dev. recog. complete */
unsigned int fake_irb:1; /* deliver faked irb */
unsigned int intretry:1; /* retry internal operation */
unsigned int resuming:1; /* recognition while resume */
} __attribute__((packed)) flags;
unsigned long intparm; /* user interruption parameter */
struct qdio_irq *qdio_data;
......
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