aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/cio
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/cio')
-rw-r--r--drivers/s390/cio/Makefile2
-rw-r--r--drivers/s390/cio/ccwreq.c328
-rw-r--r--drivers/s390/cio/cio.h8
-rw-r--r--drivers/s390/cio/css.c57
-rw-r--r--drivers/s390/cio/css.h3
-rw-r--r--drivers/s390/cio/device.c1006
-rw-r--r--drivers/s390/cio/device.h25
-rw-r--r--drivers/s390/cio/device_fsm.c411
-rw-r--r--drivers/s390/cio/device_id.c375
-rw-r--r--drivers/s390/cio/device_ops.c142
-rw-r--r--drivers/s390/cio/device_pgid.c963
-rw-r--r--drivers/s390/cio/device_status.c3
-rw-r--r--drivers/s390/cio/io_sch.h73
13 files changed, 1668 insertions, 1728 deletions
diff --git a/drivers/s390/cio/Makefile b/drivers/s390/cio/Makefile
index fa4c9662f65..d033414f759 100644
--- a/drivers/s390/cio/Makefile
+++ b/drivers/s390/cio/Makefile
@@ -3,7 +3,7 @@
#
obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o \
- fcx.o itcw.o crw.o
+ fcx.o itcw.o crw.o ccwreq.o
ccw_device-objs += device.o device_fsm.o device_ops.o
ccw_device-objs += device_id.o device_pgid.o device_status.o
obj-y += ccw_device.o cmf.o
diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c
new file mode 100644
index 00000000000..9509e386093
--- /dev/null
+++ b/drivers/s390/cio/ccwreq.c
@@ -0,0 +1,328 @@
+/*
+ * Handling of internal CCW device requests.
+ *
+ * Copyright IBM Corp. 2009
+ * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/err.h>
+#include <asm/ccwdev.h>
+#include <asm/cio.h>
+
+#include "io_sch.h"
+#include "cio.h"
+#include "device.h"
+#include "cio_debug.h"
+
+/**
+ * lpm_adjust - adjust path mask
+ * @lpm: path mask to adjust
+ * @mask: mask of available paths
+ *
+ * Shift @lpm right until @lpm and @mask have at least one bit in common or
+ * until @lpm is zero. Return the resulting lpm.
+ */
+int lpm_adjust(int lpm, int mask)
+{
+ while (lpm && ((lpm & mask) == 0))
+ lpm >>= 1;
+ return lpm;
+}
+
+/*
+ * Adjust path mask to use next path and reset retry count. Return resulting
+ * path mask.
+ */
+static u16 ccwreq_next_path(struct ccw_device *cdev)
+{
+ struct ccw_request *req = &cdev->private->req;
+
+ req->retries = req->maxretries;
+ req->mask = lpm_adjust(req->mask >>= 1, req->lpm);
+
+ return req->mask;
+}
+
+/*
+ * Clean up device state and report to callback.
+ */
+static void ccwreq_stop(struct ccw_device *cdev, int rc)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+
+ if (req->done)
+ return;
+ req->done = 1;
+ ccw_device_set_timeout(cdev, 0);
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+ sch->lpm = sch->schib.pmcw.pam;
+ if (rc && rc != -ENODEV && req->drc)
+ rc = req->drc;
+ req->callback(cdev, req->data, rc);
+}
+
+/*
+ * (Re-)Start the operation until retries and paths are exhausted.
+ */
+static void ccwreq_do(struct ccw_device *cdev)
+{
+ struct ccw_request *req = &cdev->private->req;
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw1 *cp = req->cp;
+ int rc = -EACCES;
+
+ while (req->mask) {
+ if (req->retries-- == 0) {
+ /* Retries exhausted, try next path. */
+ ccwreq_next_path(cdev);
+ continue;
+ }
+ /* Perform start function. */
+ sch->lpm = 0xff;
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+ rc = cio_start(sch, cp, (u8) req->mask);
+ if (rc == 0) {
+ /* I/O started successfully. */
+ ccw_device_set_timeout(cdev, req->timeout);
+ return;
+ }
+ if (rc == -ENODEV) {
+ /* Permanent device error. */
+ break;
+ }
+ if (rc == -EACCES) {
+ /* Permant path error. */
+ ccwreq_next_path(cdev);
+ continue;
+ }
+ /* Temporary improper status. */
+ rc = cio_clear(sch);
+ if (rc)
+ break;
+ return;
+ }
+ ccwreq_stop(cdev, rc);
+}
+
+/**
+ * ccw_request_start - perform I/O request
+ * @cdev: ccw device
+ *
+ * Perform the I/O request specified by cdev->req.
+ */
+void ccw_request_start(struct ccw_device *cdev)
+{
+ struct ccw_request *req = &cdev->private->req;
+
+ /* Try all paths twice to counter link flapping. */
+ req->mask = 0x8080;
+ req->retries = req->maxretries;
+ req->mask = lpm_adjust(req->mask, req->lpm);
+ req->drc = 0;
+ req->done = 0;
+ req->cancel = 0;
+ if (!req->mask)
+ goto out_nopath;
+ ccwreq_do(cdev);
+ return;
+
+out_nopath:
+ ccwreq_stop(cdev, -EACCES);
+}
+
+/**
+ * ccw_request_cancel - cancel running I/O request
+ * @cdev: ccw device
+ *
+ * Cancel the I/O request specified by cdev->req. Return non-zero if request
+ * has already finished, zero otherwise.
+ */
+int ccw_request_cancel(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+ int rc;
+
+ if (req->done)
+ return 1;
+ req->cancel = 1;
+ rc = cio_clear(sch);
+ if (rc)
+ ccwreq_stop(cdev, rc);
+ return 0;
+}
+
+/*
+ * Return the status of the internal I/O started on the specified ccw device.
+ * Perform BASIC SENSE if required.
+ */
+static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
+{
+ struct irb *irb = &cdev->private->irb;
+ struct cmd_scsw *scsw = &irb->scsw.cmd;
+
+ /* Perform BASIC SENSE if needed. */
+ if (ccw_device_accumulate_and_sense(cdev, lcirb))
+ return IO_RUNNING;
+ /* Check for halt/clear interrupt. */
+ if (scsw->fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
+ return IO_KILLED;
+ /* Check for path error. */
+ if (scsw->cc == 3 || scsw->pno)
+ return IO_PATH_ERROR;
+ /* Handle BASIC SENSE data. */
+ if (irb->esw.esw0.erw.cons) {
+ CIO_TRACE_EVENT(2, "sensedata");
+ CIO_HEX_EVENT(2, &cdev->private->dev_id,
+ sizeof(struct ccw_dev_id));
+ CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);
+ /* Check for command reject. */
+ if (irb->ecw[0] & SNS0_CMD_REJECT)
+ return IO_REJECTED;
+ /* Assume that unexpected SENSE data implies an error. */
+ return IO_STATUS_ERROR;
+ }
+ /* Check for channel errors. */
+ if (scsw->cstat != 0)
+ return IO_STATUS_ERROR;
+ /* Check for device errors. */
+ if (scsw->dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
+ return IO_STATUS_ERROR;
+ /* Check for final state. */
+ if (!(scsw->dstat & DEV_STAT_DEV_END))
+ return IO_RUNNING;
+ /* Check for other improper status. */
+ if (scsw->cc == 1 && (scsw->stctl & SCSW_STCTL_ALERT_STATUS))
+ return IO_STATUS_ERROR;
+ return IO_DONE;
+}
+
+/*
+ * Log ccw request status.
+ */
+static void ccwreq_log_status(struct ccw_device *cdev, enum io_status status)
+{
+ struct ccw_request *req = &cdev->private->req;
+ struct {
+ struct ccw_dev_id dev_id;
+ u16 retries;
+ u8 lpm;
+ u8 status;
+ } __attribute__ ((packed)) data;
+ data.dev_id = cdev->private->dev_id;
+ data.retries = req->retries;
+ data.lpm = (u8) req->mask;
+ data.status = (u8) status;
+ CIO_TRACE_EVENT(2, "reqstat");
+ CIO_HEX_EVENT(2, &data, sizeof(data));
+}
+
+/**
+ * ccw_request_handler - interrupt handler for I/O request procedure.
+ * @cdev: ccw device
+ *
+ * Handle interrupt during I/O request procedure.
+ */
+void ccw_request_handler(struct ccw_device *cdev)
+{
+ struct ccw_request *req = &cdev->private->req;
+ struct irb *irb = (struct irb *) __LC_IRB;
+ enum io_status status;
+ int rc = -EOPNOTSUPP;
+
+ /* Check status of I/O request. */
+ status = ccwreq_status(cdev, irb);
+ if (req->filter)
+ status = req->filter(cdev, req->data, irb, status);
+ if (status != IO_RUNNING)
+ ccw_device_set_timeout(cdev, 0);
+ if (status != IO_DONE && status != IO_RUNNING)
+ ccwreq_log_status(cdev, status);
+ switch (status) {
+ case IO_DONE:
+ break;
+ case IO_RUNNING:
+ return;
+ case IO_REJECTED:
+ goto err;
+ case IO_PATH_ERROR:
+ goto out_next_path;
+ case IO_STATUS_ERROR:
+ goto out_restart;
+ case IO_KILLED:
+ /* Check if request was cancelled on purpose. */
+ if (req->cancel) {
+ rc = -EIO;
+ goto err;
+ }
+ goto out_restart;
+ }
+ /* Check back with request initiator. */
+ if (!req->check)
+ goto out;
+ switch (req->check(cdev, req->data)) {
+ case 0:
+ break;
+ case -EAGAIN:
+ goto out_restart;
+ case -EACCES:
+ goto out_next_path;
+ default:
+ goto err;
+ }
+out:
+ ccwreq_stop(cdev, 0);
+ return;
+
+out_next_path:
+ /* Try next path and restart I/O. */
+ if (!ccwreq_next_path(cdev)) {
+ rc = -EACCES;
+ goto err;
+ }
+out_restart:
+ /* Restart. */
+ ccwreq_do(cdev);
+ return;
+err:
+ ccwreq_stop(cdev, rc);
+}
+
+
+/**
+ * ccw_request_timeout - timeout handler for I/O request procedure
+ * @cdev: ccw device
+ *
+ * Handle timeout during I/O request procedure.
+ */
+void ccw_request_timeout(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+ int rc;
+
+ if (!ccwreq_next_path(cdev)) {
+ /* set the final return code for this request */
+ req->drc = -ETIME;
+ }
+ rc = cio_clear(sch);
+ if (rc)
+ goto err;
+ return;
+
+err:
+ ccwreq_stop(cdev, rc);
+}
+
+/**
+ * ccw_request_notoper - notoper handler for I/O request procedure
+ * @cdev: ccw device
+ *
+ * Handle timeout during I/O request procedure.
+ */
+void ccw_request_notoper(struct ccw_device *cdev)
+{
+ ccwreq_stop(cdev, -ENODEV);
+}
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 2e43558c704..bf7f80f5a33 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -68,6 +68,11 @@ struct schib {
__u8 mda[4]; /* model dependent area */
} __attribute__ ((packed,aligned(4)));
+enum sch_todo {
+ SCH_TODO_NOTHING,
+ SCH_TODO_UNREG,
+};
+
/* subchannel data structure used by I/O subroutines */
struct subchannel {
struct subchannel_id schid;
@@ -95,7 +100,8 @@ struct subchannel {
struct device dev; /* entry in device tree */
struct css_driver *driver;
void *private; /* private per subchannel type data */
- struct work_struct work;
+ enum sch_todo todo;
+ struct work_struct todo_work;
struct schib_config config;
} __attribute__ ((aligned(8)));
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 91c25706fa8..92ff88ac110 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -133,6 +133,8 @@ out:
return rc;
}
+static void css_sch_todo(struct work_struct *work);
+
static struct subchannel *
css_alloc_subchannel(struct subchannel_id schid)
{
@@ -147,6 +149,7 @@ css_alloc_subchannel(struct subchannel_id schid)
kfree(sch);
return ERR_PTR(ret);
}
+ INIT_WORK(&sch->todo_work, css_sch_todo);
return sch;
}
@@ -190,6 +193,51 @@ void css_sch_device_unregister(struct subchannel *sch)
}
EXPORT_SYMBOL_GPL(css_sch_device_unregister);
+static void css_sch_todo(struct work_struct *work)
+{
+ struct subchannel *sch;
+ enum sch_todo todo;
+
+ sch = container_of(work, struct subchannel, todo_work);
+ /* Find out todo. */
+ spin_lock_irq(sch->lock);
+ todo = sch->todo;
+ CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid,
+ sch->schid.sch_no, todo);
+ sch->todo = SCH_TODO_NOTHING;
+ spin_unlock_irq(sch->lock);
+ /* Perform todo. */
+ if (todo == SCH_TODO_UNREG)
+ css_sch_device_unregister(sch);
+ /* Release workqueue ref. */
+ put_device(&sch->dev);
+}
+
+/**
+ * css_sched_sch_todo - schedule a subchannel operation
+ * @sch: subchannel
+ * @todo: todo
+ *
+ * Schedule the operation identified by @todo to be performed on the slow path
+ * workqueue. Do nothing if another operation with higher priority is already
+ * scheduled. Needs to be called with subchannel lock held.
+ */
+void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo)
+{
+ CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n",
+ sch->schid.ssid, sch->schid.sch_no, todo);
+ if (sch->todo >= todo)
+ return;
+ /* Get workqueue ref. */
+ if (!get_device(&sch->dev))
+ return;
+ sch->todo = todo;
+ if (!queue_work(slow_path_wq, &sch->todo_work)) {
+ /* Already queued, release workqueue ref. */
+ put_device(&sch->dev);
+ }
+}
+
static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
{
int i;
@@ -376,8 +424,8 @@ static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
/* Unusable - ignore. */
return 0;
}
- CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, "
- "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER);
+ CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid,
+ schid.sch_no);
return css_probe_device(schid);
}
@@ -394,6 +442,10 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
"Got subchannel machine check but "
"no sch_event handler provided.\n");
}
+ if (ret != 0 && ret != -EAGAIN) {
+ CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n",
+ sch->schid.ssid, sch->schid.sch_no, ret);
+ }
return ret;
}
@@ -684,6 +736,7 @@ static int __init setup_css(int nr)
css->pseudo_subchannel->dev.parent = &css->device;
css->pseudo_subchannel->dev.release = css_subchannel_release;
dev_set_name(&css->pseudo_subchannel->dev, "defunct");
+ mutex_init(&css->pseudo_subchannel->reg_mutex);
ret = cio_create_sch_lock(css->pseudo_subchannel);
if (ret) {
kfree(css->pseudo_subchannel);
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index 68d6b0bf151..fe84b92cde6 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -11,6 +11,8 @@
#include <asm/chpid.h>
#include <asm/schid.h>
+#include "cio.h"
+
/*
* path grouping stuff
*/
@@ -151,4 +153,5 @@ int css_sch_is_valid(struct schib *);
extern struct workqueue_struct *slow_path_wq;
void css_wait_for_slow_path(void);
+void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
#endif
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 2490b741e16..9fecfb4223a 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -7,6 +7,10 @@
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*/
+
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
@@ -299,53 +303,18 @@ int ccw_device_is_orphan(struct ccw_device *cdev)
static void ccw_device_unregister(struct ccw_device *cdev)
{
- if (test_and_clear_bit(1, &cdev->private->registered)) {
+ if (device_is_registered(&cdev->dev)) {
+ /* Undo device_add(). */
device_del(&cdev->dev);
+ }
+ if (cdev->private->flags.initialized) {
+ cdev->private->flags.initialized = 0;
/* Release reference from device_initialize(). */
put_device(&cdev->dev);
}
}
-static void ccw_device_remove_orphan_cb(struct work_struct *work)
-{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
-
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- ccw_device_unregister(cdev);
- /* Release cdev reference for workqueue processing. */
- put_device(&cdev->dev);
-}
-
-static void
-ccw_device_remove_disconnected(struct ccw_device *cdev)
-{
- unsigned long flags;
-
- /*
- * Forced offline in disconnected state means
- * 'throw away device'.
- */
- if (ccw_device_is_orphan(cdev)) {
- /*
- * Deregister ccw device.
- * Unfortunately, we cannot do this directly from the
- * attribute method.
- */
- /* Get cdev reference for workqueue processing. */
- if (!get_device(&cdev->dev))
- return;
- spin_lock_irqsave(cdev->ccwlock, flags);
- cdev->private->state = DEV_STATE_NOT_OPER;
- spin_unlock_irqrestore(cdev->ccwlock, flags);
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_remove_orphan_cb);
- queue_work(slow_path_wq, &cdev->private->kick_work);
- } else
- /* Deregister subchannel, which will kill the ccw device. */
- ccw_device_schedule_sch_unregister(cdev);
-}
+static void io_subchannel_quiesce(struct subchannel *);
/**
* ccw_device_set_offline() - disable a ccw device for I/O
@@ -360,7 +329,8 @@ ccw_device_remove_disconnected(struct ccw_device *cdev)
*/
int ccw_device_set_offline(struct ccw_device *cdev)
{
- int ret;
+ struct subchannel *sch;
+ int ret, state;
if (!cdev)
return -ENODEV;
@@ -374,6 +344,7 @@ int ccw_device_set_offline(struct ccw_device *cdev)
}
cdev->online = 0;
spin_lock_irq(cdev->ccwlock);
+ sch = to_subchannel(cdev->dev.parent);
/* Wait until a final state or DISCONNECTED is reached */
while (!dev_fsm_final_state(cdev) &&
cdev->private->state != DEV_STATE_DISCONNECTED) {
@@ -382,20 +353,37 @@ int ccw_device_set_offline(struct ccw_device *cdev)
cdev->private->state == DEV_STATE_DISCONNECTED));
spin_lock_irq(cdev->ccwlock);
}
- ret = ccw_device_offline(cdev);
- if (ret)
- goto error;
+ do {
+ ret = ccw_device_offline(cdev);
+ if (!ret)
+ break;
+ CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
+ "0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
+ cdev->private->dev_id.devno);
+ if (ret != -EBUSY)
+ goto error;
+ state = cdev->private->state;
+ spin_unlock_irq(cdev->ccwlock);
+ io_subchannel_quiesce(sch);
+ spin_lock_irq(cdev->ccwlock);
+ cdev->private->state = state;
+ } while (ret == -EBUSY);
spin_unlock_irq(cdev->ccwlock);
wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
cdev->private->state == DEV_STATE_DISCONNECTED));
+ /* Inform the user if set offline failed. */
+ if (cdev->private->state == DEV_STATE_BOXED) {
+ pr_warning("%s: The device entered boxed state while "
+ "being set offline\n", dev_name(&cdev->dev));
+ } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
+ pr_warning("%s: The device stopped operating while "
+ "being set offline\n", dev_name(&cdev->dev));
+ }
/* Give up reference from ccw_device_set_online(). */
put_device(&cdev->dev);
return 0;
error:
- CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
- ret, cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno);
cdev->private->state = DEV_STATE_OFFLINE;
dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
spin_unlock_irq(cdev->ccwlock);
@@ -448,6 +436,16 @@ int ccw_device_set_online(struct ccw_device *cdev)
if ((cdev->private->state != DEV_STATE_ONLINE) &&
(cdev->private->state != DEV_STATE_W4SENSE)) {
spin_unlock_irq(cdev->ccwlock);
+ /* Inform the user that set online failed. */
+ if (cdev->private->state == DEV_STATE_BOXED) {
+ pr_warning("%s: Setting the device online failed "
+ "because it is boxed\n",
+ dev_name(&cdev->dev));
+ } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
+ pr_warning("%s: Setting the device online failed "
+ "because it is not operational\n",
+ dev_name(&cdev->dev));
+ }
/* Give up online reference since onlining failed. */
put_device(&cdev->dev);
return -ENODEV;
@@ -494,27 +492,22 @@ error:
static int online_store_handle_offline(struct ccw_device *cdev)
{
- if (cdev->private->state == DEV_STATE_DISCONNECTED)
- ccw_device_remove_disconnected(cdev);
- else if (cdev->online && cdev->drv && cdev->drv->set_offline)
+ if (cdev->private->state == DEV_STATE_DISCONNECTED) {
+ spin_lock_irq(cdev->ccwlock);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
+ spin_unlock_irq(cdev->ccwlock);
+ } else if (cdev->online && cdev->drv && cdev->drv->set_offline)
return ccw_device_set_offline(cdev);
return 0;
}
static int online_store_recog_and_online(struct ccw_device *cdev)
{
- int ret;
-
/* Do device recognition, if needed. */
if (cdev->private->state == DEV_STATE_BOXED) {
- ret = ccw_device_recognition(cdev);
- if (ret) {
- CIO_MSG_EVENT(0, "Couldn't start recognition "
- "for device 0.%x.%04x (ret=%d)\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- return ret;
- }
+ spin_lock_irq(cdev->ccwlock);
+ ccw_device_recognition(cdev);
+ spin_unlock_irq(cdev->ccwlock);
wait_event(cdev->private->wait_q,
cdev->private->flags.recog_done);
if (cdev->private->state != DEV_STATE_OFFLINE)
@@ -553,11 +546,10 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr,
int force, ret;
unsigned long i;
- if ((cdev->private->state != DEV_STATE_OFFLINE &&
- cdev->private->state != DEV_STATE_ONLINE &&
- cdev->private->state != DEV_STATE_BOXED &&
- cdev->private->state != DEV_STATE_DISCONNECTED) ||
- atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
+ if (!dev_fsm_final_state(cdev) &&
+ cdev->private->state != DEV_STATE_DISCONNECTED)
+ return -EAGAIN;
+ if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
return -EAGAIN;
if (cdev->drv && !try_module_get(cdev->drv->owner)) {
@@ -665,81 +657,31 @@ static int ccw_device_register(struct ccw_device *cdev)
cdev->private->dev_id.devno);
if (ret)
return ret;
- ret = device_add(dev);
- if (ret)
- return ret;
-
- set_bit(1, &cdev->private->registered);
- return ret;
+ return device_add(dev);
}
-struct match_data {
- struct ccw_dev_id dev_id;
- struct ccw_device * sibling;
-};
-
-static int
-match_devno(struct device * dev, void * data)
-{
- struct match_data * d = data;
- struct ccw_device * cdev;
-
- cdev = to_ccwdev(dev);
- if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
- !ccw_device_is_orphan(cdev) &&
- ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
- (cdev != d->sibling))
- return 1;
- return 0;
-}
-
-static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
- struct ccw_device *sibling)
-{
- struct device *dev;
- struct match_data data;
-
- data.dev_id = *dev_id;
- data.sibling = sibling;
- dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
-
- return dev ? to_ccwdev(dev) : NULL;
-}
-
-static int match_orphan(struct device *dev, void *data)
+static int match_dev_id(struct device *dev, void *data)
{
- struct ccw_dev_id *dev_id;
- struct ccw_device *cdev;
+ struct ccw_device *cdev = to_ccwdev(dev);
+ struct ccw_dev_id *dev_id = data;
- dev_id = data;
- cdev = to_ccwdev(dev);
return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
}
-static struct ccw_device *
-get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
- struct ccw_dev_id *dev_id)
+static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
{
struct device *dev;
- dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
- match_orphan);
+ dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
return dev ? to_ccwdev(dev) : NULL;
}
-void ccw_device_do_unbind_bind(struct work_struct *work)
+static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
- struct subchannel *sch;
int ret;
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- sch = to_subchannel(cdev->dev.parent);
-
- if (test_bit(1, &cdev->private->registered)) {
+ if (device_is_registered(&cdev->dev)) {
device_release_driver(&cdev->dev);
ret = device_attach(&cdev->dev);
WARN_ON(ret == -ENODEV);
@@ -773,6 +715,8 @@ static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
return ERR_PTR(-ENOMEM);
}
+static void ccw_device_todo(struct work_struct *work);
+
static int io_subchannel_initialize_dev(struct subchannel *sch,
struct ccw_device *cdev)
{
@@ -780,7 +724,7 @@ static int io_subchannel_initialize_dev(struct subchannel *sch,
atomic_set(&cdev->private->onoff, 0);
cdev->dev.parent = &sch->dev;
cdev->dev.release = ccw_device_release;
- INIT_WORK(&cdev->private->kick_work, NULL);
+ INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
cdev->dev.groups = ccwdev_attr_groups;
/* Do first half of device_register. */
device_initialize(&cdev->dev);
@@ -789,6 +733,7 @@ static int io_subchannel_initialize_dev(struct subchannel *sch,
put_device(&cdev->dev);
return -ENODEV;
}
+ cdev->private->flags.initialized = 1;
return 0;
}
@@ -806,76 +751,7 @@ static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
return cdev;
}
-static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
-
-static void sch_attach_device(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- css_update_ssd_info(sch);
- spin_lock_irq(sch->lock);
- sch_set_cdev(sch, cdev);
- cdev->private->schid = sch->schid;
- cdev->ccwlock = sch->lock;
- ccw_device_trigger_reprobe(cdev);
- spin_unlock_irq(sch->lock);
-}
-
-static void sch_attach_disconnected_device(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- struct subchannel *other_sch;
- int ret;
-
- /* Get reference for new parent. */
- if (!get_device(&sch->dev))
- return;
- other_sch = to_subchannel(cdev->dev.parent);
- /* Note: device_move() changes cdev->dev.parent */
- ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
- if (ret) {
- CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
- "(ret=%d)!\n", cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- /* Put reference for new parent. */
- put_device(&sch->dev);
- return;
- }
- sch_set_cdev(other_sch, NULL);
- /* No need to keep a subchannel without ccw device around. */
- css_sch_device_unregister(other_sch);
- sch_attach_device(sch, cdev);
- /* Put reference for old parent. */
- put_device(&other_sch->dev);
-}
-
-static void sch_attach_orphaned_device(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- int ret;
- struct subchannel *pseudo_sch;
-
- /* Get reference for new parent. */
- if (!get_device(&sch->dev))
- return;
- pseudo_sch = to_subchannel(cdev->dev.parent);
- /*
- * Try to move the ccw device to its new subchannel.
- * Note: device_move() changes cdev->dev.parent
- */
- ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
- if (ret) {
- CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
- "failed (ret=%d)!\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- /* Put reference for new parent. */
- put_device(&sch->dev);
- return;
- }
- sch_attach_device(sch, cdev);
- /* Put reference on pseudo subchannel. */
- put_device(&pseudo_sch->dev);
-}
+static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
static void sch_create_and_recog_new_device(struct subchannel *sch)
{
@@ -888,100 +764,19 @@ static void sch_create_and_recog_new_device(struct subchannel *sch)
css_sch_device_unregister(sch);
return;
}
- spin_lock_irq(sch->lock);
- sch_set_cdev(sch, cdev);
- spin_unlock_irq(sch->lock);
/* Start recognition for the new ccw device. */
- if (io_subchannel_recog(cdev, sch)) {
- spin_lock_irq(sch->lock);
- sch_set_cdev(sch, NULL);
- spin_unlock_irq(sch->lock);
- css_sch_device_unregister(sch);
- /* Put reference from io_subchannel_create_ccwdev(). */
- put_device(&sch->dev);
- /* Give up initial reference. */
- put_device(&cdev->dev);
- }
-}
-
-
-void ccw_device_move_to_orphanage(struct work_struct *work)
-{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
- struct ccw_device *replacing_cdev;
- struct subchannel *sch;
- int ret;
- struct channel_subsystem *css;
- struct ccw_dev_id dev_id;
-
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- sch = to_subchannel(cdev->dev.parent);
- css = to_css(sch->dev.parent);
- dev_id.devno = sch->schib.pmcw.dev;
- dev_id.ssid = sch->schid.ssid;
-
- /* Increase refcount for pseudo subchannel. */
- get_device(&css->pseudo_subchannel->dev);
- /*
- * Move the orphaned ccw device to the orphanage so the replacing
- * ccw device can take its place on the subchannel.
- * Note: device_move() changes cdev->dev.parent
- */
- ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev,
- DPM_ORDER_NONE);
- if (ret) {
- CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
- "(ret=%d)!\n", cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, ret);
- /* Decrease refcount for pseudo subchannel again. */
- put_device(&css->pseudo_subchannel->dev);
- return;
- }
- cdev->ccwlock = css->pseudo_subchannel->lock;
- /*
- * Search for the replacing ccw device
- * - among the disconnected devices
- * - in the orphanage
- */
- replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
- if (replacing_cdev) {
- sch_attach_disconnected_device(sch, replacing_cdev);
- /* Release reference from get_disc_ccwdev_by_dev_id() */
- put_device(&replacing_cdev->dev);
- /* Release reference of subchannel from old cdev. */
- put_device(&sch->dev);
- return;
- }
- replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
- if (replacing_cdev) {
- sch_attach_orphaned_device(sch, replacing_cdev);
- /* Release reference from get_orphaned_ccwdev_by_dev_id() */
- put_device(&replacing_cdev->dev);
- /* Release reference of subchannel from old cdev. */
- put_device(&sch->dev);
- return;
- }
- sch_create_and_recog_new_device(sch);
- /* Release reference of subchannel from old cdev. */
- put_device(&sch->dev);
+ io_subchannel_recog(cdev, sch);
}
/*
* Register recognized device.
*/
-static void
-io_subchannel_register(struct work_struct *work)
+static void io_subchannel_register(struct ccw_device *cdev)
{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
struct subchannel *sch;
int ret;
unsigned long flags;
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
sch = to_subchannel(cdev->dev.parent);
/*
* Check if subchannel is still registered. It may have become
@@ -1033,41 +828,23 @@ out:
cdev->private->flags.recog_done = 1;
wake_up(&cdev->private->wait_q);
out_err:
- /* Release reference for workqueue processing. */
- put_device(&cdev->dev);
if (atomic_dec_and_test(&ccw_device_init_count))
wake_up(&ccw_device_init_wq);
}
-static void ccw_device_call_sch_unregister(struct work_struct *work)
+static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
struct subchannel *sch;
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
/* Get subchannel reference for local processing. */
if (!get_device(cdev->dev.parent))
return;
sch = to_subchannel(cdev->dev.parent);
css_sch_device_unregister(sch);
- /* Release cdev reference for workqueue processing.*/
- put_device(&cdev->dev);
/* Release subchannel reference for local processing. */
put_device(&sch->dev);
}
-void ccw_device_schedule_sch_unregister(struct ccw_device *cdev)
-{
- /* Get cdev reference for workqueue processing. */
- if (!get_device(&cdev->dev))
- return;
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_call_sch_unregister);
- queue_work(slow_path_wq, &cdev->private->kick_work);
-}
-
/*
* subchannel recognition done. Called from the state machine.
*/
@@ -1083,7 +860,8 @@ io_subchannel_recog_done(struct ccw_device *cdev)
/* Device did not respond in time. */
case DEV_STATE_NOT_OPER:
cdev->private->flags.recog_done = 1;
- ccw_device_schedule_sch_unregister(cdev);
+ /* Remove device found not operational. */
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
if (atomic_dec_and_test(&ccw_device_init_count))
wake_up(&ccw_device_init_wq);
break;
@@ -1092,22 +870,15 @@ io_subchannel_recog_done(struct ccw_device *cdev)
* We can't register the device in interrupt context so
* we schedule a work item.
*/
- if (!get_device(&cdev->dev))
- break;
- PREPARE_WORK(&cdev->private->kick_work,
- io_subchannel_register);
- queue_work(slow_path_wq, &cdev->private->kick_work);
+ ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
break;
}
}
-static int
-io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
+static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
{
- int rc;
struct ccw_device_private *priv;
- sch_set_cdev(sch, cdev);
cdev->ccwlock = sch->lock;
/* Init private data. */
@@ -1125,62 +896,81 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
/* Start async. device sensing. */
spin_lock_irq(sch->lock);
- rc = ccw_device_recognition(cdev);
+ sch_set_cdev(sch, cdev);
+ ccw_device_recognition(cdev);
spin_unlock_irq(sch->lock);
- if (rc) {
- if (atomic_dec_and_test(&ccw_device_init_count))
- wake_up(&ccw_device_init_wq);
- }
- return rc;
}
-static void ccw_device_move_to_sch(struct work_struct *work)
+static int ccw_device_move_to_sch(struct ccw_device *cdev,
+ struct subchannel *sch)
{
- struct ccw_device_private *priv;
- int rc;
- struct subchannel *sch;
- struct ccw_device *cdev;
- struct subchannel *former_parent;
+ struct subchannel *old_sch;
+ int rc, old_enabled = 0;
- priv = container_of(work, struct ccw_device_private, kick_work);
- sch = priv->sch;
- cdev = priv->cdev;
- former_parent = to_subchannel(cdev->dev.parent);
- /* Get reference for new parent. */
+ old_sch = to_subchannel(cdev->dev.parent);
+ /* Obtain child reference for new parent. */
if (!get_device(&sch->dev))
- return;
+ return -ENODEV;
+
+ if (!sch_is_pseudo_sch(old_sch)) {
+ spin_lock_irq(old_sch->lock);
+ old_enabled = old_sch->schib.pmcw.ena;
+ rc = 0;
+ if (old_enabled)
+ rc = cio_disable_subchannel(old_sch);
+ spin_unlock_irq(old_sch->lock);
+ if (rc == -EBUSY) {
+ /* Release child reference for new parent. */
+ put_device(&sch->dev);
+ return rc;
+ }
+ }
+
mutex_lock(&sch->reg_mutex);
- /*
- * Try to move the ccw device to its new subchannel.
- * Note: device_move() changes cdev->dev.parent
- */
rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
mutex_unlock(&sch->reg_mutex);
if (rc) {
- CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
- "0.%x.%04x failed (ret=%d)!\n",
+ CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, rc);
- css_sch_device_unregister(sch);
- /* Put reference for new parent again. */
+ sch->schib.pmcw.dev, rc);
+ if (old_enabled) {
+ /* Try to reenable the old subchannel. */
+ spin_lock_irq(old_sch->lock);
+ cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
+ spin_unlock_irq(old_sch->lock);
+ }
+ /* Release child reference for new parent. */
put_device(&sch->dev);
- goto out;
+ return rc;
}
- if (!sch_is_pseudo_sch(former_parent)) {
- spin_lock_irq(former_parent->lock);
- sch_set_cdev(former_parent, NULL);
- spin_unlock_irq(former_parent->lock);
- css_sch_device_unregister(former_parent);
- /* Reset intparm to zeroes. */
- former_parent->config.intparm = 0;
- cio_commit_config(former_parent);
+ /* Clean up old subchannel. */
+ if (!sch_is_pseudo_sch(old_sch)) {
+ spin_lock_irq(old_sch->lock);
+ sch_set_cdev(old_sch, NULL);
+ spin_unlock_irq(old_sch->lock);
+ css_schedule_eval(old_sch->schid);
}
- sch_attach_device(sch, cdev);
-out:
- /* Put reference for old parent. */
- put_device(&former_parent->dev);
- put_device(&cdev->dev);
+ /* Release child reference for old parent. */
+ put_device(&old_sch->dev);
+ /* Initialize new subchannel. */
+ spin_lock_irq(sch->lock);
+ cdev->private->schid = sch->schid;
+ cdev->ccwlock = sch->lock;
+ if (!sch_is_pseudo_sch(sch))
+ sch_set_cdev(sch, cdev);
+ spin_unlock_irq(sch->lock);
+ if (!sch_is_pseudo_sch(sch))
+ css_update_ssd_info(sch);
+ return 0;
+}
+
+static int ccw_device_move_to_orph(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct channel_subsystem *css = to_css(sch->dev.parent);
+
+ return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
}
static void io_subchannel_irq(struct subchannel *sch)
@@ -1199,9 +989,6 @@ void io_subchannel_init_config(struct subchannel *sch)
{
memset(&sch->config, 0, sizeof(sch->config));
sch->config.csense = 1;
- /* Use subchannel mp mode when there is more than 1 installed CHPID. */
- if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0)
- sch->config.mp = 1;
}
static void io_subchannel_init_fields(struct subchannel *sch)
@@ -1222,23 +1009,6 @@ static void io_subchannel_init_fields(struct subchannel *sch)
io_subchannel_init_config(sch);
}
-static void io_subchannel_do_unreg(struct work_struct *work)
-{
- struct subchannel *sch;
-
- sch = container_of(work, struct subchannel, work);
- css_sch_device_unregister(sch);
- put_device(&sch->dev);
-}
-
-/* Schedule unregister if we have no cdev. */
-static void io_subchannel_schedule_removal(struct subchannel *sch)
-{
- get_device(&sch->dev);
- INIT_WORK(&sch->work, io_subchannel_do_unreg);
- queue_work(slow_path_wq, &sch->work);
-}
-
/*
* Note: We always return 0 so that we bind to the device even on error.
* This is needed so that our remove function is called on unregister.
@@ -1247,8 +1017,6 @@ static int io_subchannel_probe(struct subchannel *sch)
{
struct ccw_device *cdev;
int rc;
- unsigned long flags;
- struct ccw_dev_id dev_id;
if (cio_is_console(sch->schid)) {
rc = sysfs_create_group(&sch->dev.kobj,
@@ -1268,6 +1036,7 @@ static int io_subchannel_probe(struct subchannel *sch)
cdev = sch_get_cdev(sch);
cdev->dev.groups = ccwdev_attr_groups;
device_initialize(&cdev->dev);
+ cdev->private->flags.initialized = 1;
ccw_device_register(cdev);
/*
* Check if the device is already online. If it is
@@ -1292,44 +1061,14 @@ static int io_subchannel_probe(struct subchannel *sch)
sch->private = kzalloc(sizeof(struct io_subchannel_private),
GFP_KERNEL | GFP_DMA);
if (!sch->private)
- goto out_err;
- /*
- * First check if a fitting device may be found amongst the
- * disconnected devices or in the orphanage.
- */
- dev_id.devno = sch->schib.pmcw.dev;
- dev_id.ssid = sch->schid.ssid;
- cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
- if (!cdev)
- cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
- &dev_id);
- if (cdev) {
- /*
- * Schedule moving the device until when we have a registered
- * subchannel to move to and succeed the probe. We can
- * unregister later again, when the probe is through.
- */
- cdev->private->sch = sch;
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_move_to_sch);
- queue_work(slow_path_wq, &cdev->private->kick_work);
- return 0;
- }
- cdev = io_subchannel_create_ccwdev(sch);
- if (IS_ERR(cdev))
- goto out_err;
- rc = io_subchannel_recog(cdev, sch);
- if (rc) {
- spin_lock_irqsave(sch->lock, flags);
- io_subchannel_recog_done(cdev);
- spin_unlock_irqrestore(sch->lock, flags);
- }
+ goto out_schedule;
+ css_schedule_eval(sch->schid);
return 0;
-out_err:
- kfree(sch->private);
- sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
+
out_schedule:
- io_subchannel_schedule_removal(sch);
+ spin_lock_irq(sch->lock);
+ css_sched_sch_todo(sch, SCH_TODO_UNREG);
+ spin_unlock_irq(sch->lock);
return 0;
}
@@ -1337,32 +1076,23 @@ static int
io_subchannel_remove (struct subchannel *sch)
{
struct ccw_device *cdev;
- unsigned long flags;
cdev = sch_get_cdev(sch);
if (!cdev)
- return 0;
+ goto out_free;
+ io_subchannel_quiesce(sch);
/* Set ccw device to not operational and drop reference. */
- spin_lock_irqsave(cdev->ccwlock, flags);
+ spin_lock_irq(cdev->ccwlock);
sch_set_cdev(sch, NULL);
cdev->private->state = DEV_STATE_NOT_OPER;
- spin_unlock_irqrestore(cdev->ccwlock, flags);
+ spin_unlock_irq(cdev->ccwlock);
ccw_device_unregister(cdev);
+out_free:
kfree(sch->private);
sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
return 0;
}
-static int io_subchannel_notify(struct subchannel *sch, int event)
-{
- struct ccw_device *cdev;
-
- cdev = sch_get_cdev(sch);
- if (!cdev)
- return 0;
- return ccw_device_notify(cdev, event);
-}
-
static void io_subchannel_verify(struct subchannel *sch)
{
struct ccw_device *cdev;
@@ -1372,36 +1102,6 @@ static void io_subchannel_verify(struct subchannel *sch)
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
}
-static int check_for_io_on_path(struct subchannel *sch, int mask)
-{
- if (cio_update_schib(sch))
- return 0;
- if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask)
- return 1;
- return 0;
-}
-
-static void terminate_internal_io(struct subchannel *sch,
- struct ccw_device *cdev)
-{
- if (cio_clear(sch)) {
- /* Recheck device in case clear failed. */
- sch->lpm = 0;
- if (cdev->online)
- dev_fsm_event(cdev, DEV_EVENT_VERIFY);
- else
- css_schedule_eval(sch->schid);
- return;
- }
- cdev->private->state = DEV_STATE_CLEAR_VERIFY;
- /* Request retry of internal operation. */
- cdev->private->flags.intretry = 1;
- /* Call handler. */
- if (cdev->handler)
- cdev->handler(cdev, cdev->private->intparm,
- ERR_PTR(-EIO));
-}
-
static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
{
struct ccw_device *cdev;
@@ -1409,18 +1109,24 @@ static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
cdev = sch_get_cdev(sch);
if (!cdev)
return;
- if (check_for_io_on_path(sch, mask)) {
- if (cdev->private->state == DEV_STATE_ONLINE)
- ccw_device_kill_io(cdev);
- else {
- terminate_internal_io(sch, cdev);
- /* Re-start path verification. */
- dev_fsm_event(cdev, DEV_EVENT_VERIFY);
- }
- } else
- /* trigger path verification. */
- dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+ if (cio_update_schib(sch))
+ goto err;
+ /* Check for I/O on path. */
+ if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
+ goto out;
+ if (cdev->private->state == DEV_STATE_ONLINE) {
+ ccw_device_kill_io(cdev);
+ goto out;
+ }
+ if (cio_clear(sch))
+ goto err;
+out:
+ /* Trigger path verification. */
+ dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+ return;
+err:
+ dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
}
static int io_subchannel_chp_event(struct subchannel *sch,
@@ -1457,46 +1163,41 @@ static int io_subchannel_chp_event(struct subchannel *sch,
return 0;
}
-static void
-io_subchannel_shutdown(struct subchannel *sch)
+static void io_subchannel_quiesce(struct subchannel *sch)
{
struct ccw_device *cdev;
int ret;
+ spin_lock_irq(sch->lock);
cdev = sch_get_cdev(sch);
-
if (cio_is_console(sch->schid))
- return;
+ goto out_unlock;
if (!sch->schib.pmcw.ena)
- /* Nothing to do. */
- return;
+ goto out_unlock;
ret = cio_disable_subchannel(sch);
if (ret != -EBUSY)
- /* Subchannel is disabled, we're done. */
- return;
- cdev->private->state = DEV_STATE_QUIESCE;
+ goto out_unlock;
if (cdev->handler)
- cdev->handler(cdev, cdev->private->intparm,
- ERR_PTR(-EIO));
- ret = ccw_device_cancel_halt_clear(cdev);
- if (ret == -EBUSY) {
- ccw_device_set_timeout(cdev, HZ/10);
- wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
+ cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
+ while (ret == -EBUSY) {
+ cdev->private->state = DEV_STATE_QUIESCE;
+ ret = ccw_device_cancel_halt_clear(cdev);
+ if (ret == -EBUSY) {
+ ccw_device_set_timeout(cdev, HZ/10);
+ spin_unlock_irq(sch->lock);
+ wait_event(cdev->private->wait_q,
+ cdev->private->state != DEV_STATE_QUIESCE);
+ spin_lock_irq(sch->lock);
+ }
+ ret = cio_disable_subchannel(sch);
}
- cio_disable_subchannel(sch);
+out_unlock:
+ spin_unlock_irq(sch->lock);
}
-static int io_subchannel_get_status(struct subchannel *sch)
+static void io_subchannel_shutdown(struct subchannel *sch)
{
- struct schib schib;
-
- if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
- return CIO_GONE;
- if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
- return CIO_REVALIDATE;
- if (!sch->lpm)
- return CIO_NO_PATH;
- return CIO_OPER;
+ io_subchannel_quiesce(sch);
}
static int device_is_disconnected(struct ccw_device *cdev)
@@ -1575,20 +1276,16 @@ static void ccw_device_schedule_recovery(void)
static int purge_fn(struct device *dev, void *data)
{
struct ccw_device *cdev = to_ccwdev(dev);
- struct ccw_device_private *priv = cdev->private;
- int unreg;
+ struct ccw_dev_id *id = &cdev->private->dev_id;
spin_lock_irq(cdev->ccwlock);
- unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) &&
- (priv->state == DEV_STATE_OFFLINE);
+ if (is_blacklisted(id->ssid, id->devno) &&
+ (cdev->private->state == DEV_STATE_OFFLINE)) {
+ CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
+ id->devno);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+ }
spin_unlock_irq(cdev->ccwlock);
- if (!unreg)
- goto out;
- CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid,
- priv->dev_id.devno);
- ccw_device_schedule_sch_unregister(cdev);
-
-out:
/* Abort loop in case of pending signal. */
if (signal_pending(current))
return -EINTR;
@@ -1630,91 +1327,169 @@ void ccw_device_set_notoper(struct ccw_device *cdev)
cdev->private->state = DEV_STATE_NOT_OPER;
}
-static int io_subchannel_sch_event(struct subchannel *sch, int slow)
+enum io_sch_action {
+ IO_SCH_UNREG,
+ IO_SCH_ORPH_UNREG,
+ IO_SCH_ATTACH,
+ IO_SCH_UNREG_ATTACH,
+ IO_SCH_ORPH_ATTACH,
+ IO_SCH_REPROBE,
+ IO_SCH_VERIFY,
+ IO_SCH_DISC,
+ IO_SCH_NOP,
+};
+
+static enum io_sch_action sch_get_action(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+
+ cdev = sch_get_cdev(sch);
+ if (cio_update_schib(sch)) {
+ /* Not operational. */
+ if (!cdev)
+ return IO_SCH_UNREG;
+ if (!ccw_device_notify(cdev, CIO_GONE))
+ return IO_SCH_UNREG;
+ return IO_SCH_ORPH_UNREG;
+ }
+ /* Operational. */
+ if (!cdev)
+ return IO_SCH_ATTACH;
+ if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
+ if (!ccw_device_notify(cdev, CIO_GONE))
+ return IO_SCH_UNREG_ATTACH;
+ return IO_SCH_ORPH_ATTACH;
+ }
+ if ((sch->schib.pmcw.pam & sch->opm) == 0) {
+ if (!ccw_device_notify(cdev, CIO_NO_PATH))
+ return IO_SCH_UNREG;
+ return IO_SCH_DISC;
+ }
+ if (device_is_disconnected(cdev))
+ return IO_SCH_REPROBE;
+ if (cdev->online)
+ return IO_SCH_VERIFY;
+ return IO_SCH_NOP;
+}
+
+/**
+ * io_subchannel_sch_event - process subchannel event
+ * @sch: subchannel
+ * @process: non-zero if function is called in process context
+ *
+ * An unspecified event occurred for this subchannel. Adjust data according
+ * to the current operational state of the subchannel and device. Return
+ * zero when the event has been handled sufficiently or -EAGAIN when this
+ * function should be called again in process context.
+ */
+static int io_subchannel_sch_event(struct subchannel *sch, int process)
{
- int event, ret, disc;
unsigned long flags;
- enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action;
struct ccw_device *cdev;
+ struct ccw_dev_id dev_id;
+ enum io_sch_action action;
+ int rc = -EAGAIN;
spin_lock_irqsave(sch->lock, flags);
+ if (!device_is_registered(&sch->dev))
+ goto out_unlock;
+ if (work_pending(&sch->todo_work))
+ goto out_unlock;
cdev = sch_get_cdev(sch);
- disc = device_is_disconnected(cdev);
- if (disc && slow) {
- /* Disconnected devices are evaluated directly only.*/
- spin_unlock_irqrestore(sch->lock, flags);
- return 0;
- }
- /* No interrupt after machine check - kill pending timers. */
- if (cdev)
- ccw_device_set_timeout(cdev, 0);
- if (!disc && !slow) {
- /* Non-disconnected devices are evaluated on the slow path. */
- spin_unlock_irqrestore(sch->lock, flags);
- return -EAGAIN;
+ if (cdev && work_pending(&cdev->private->todo_work))
+ goto out_unlock;
+ action = sch_get_action(sch);
+ CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
+ sch->schid.ssid, sch->schid.sch_no, process,
+ action);
+ /* Perform immediate actions while holding the lock. */
+ switch (action) {
+ case IO_SCH_REPROBE:
+ /* Trigger device recognition. */
+ ccw_device_trigger_reprobe(cdev);
+ rc = 0;
+ goto out_unlock;
+ case IO_SCH_VERIFY:
+ /* Trigger path verification. */
+ io_subchannel_verify(sch);
+ rc = 0;
+ goto out_unlock;
+ case IO_SCH_DISC:
+ ccw_device_set_disconnected(cdev);
+ rc = 0;
+ goto out_unlock;
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_ORPH_ATTACH:
+ ccw_device_set_disconnected(cdev);
+ break;
+ case IO_SCH_UNREG_ATTACH:
+ case IO_SCH_UNREG:
+ if (cdev)
+ ccw_device_set_notoper(cdev);
+ break;
+ case IO_SCH_NOP:
+ rc = 0;
+ goto out_unlock;
+ default:
+ break;
}
- event = io_subchannel_get_status(sch);
- CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
- sch->schid.ssid, sch->schid.sch_no, event,
- disc ? "disconnected" : "normal",
- slow ? "slow" : "fast");
- /* Analyze subchannel status. */
- action = NONE;
- switch (event) {
- case CIO_NO_PATH:
- if (disc) {
- /* Check if paths have become available. */
- action = REPROBE;
- break;
- }
- /* fall through */
- case CIO_GONE:
- /* Ask driver what to do with device. */
- if (io_subchannel_notify(sch, event))
- action = DISC;
- else
- action = UNREGISTER;
+ spin_unlock_irqrestore(sch->lock, flags);
+ /* All other actions require process context. */
+ if (!process)
+ goto out;
+ /* Handle attached ccw device. */
+ switch (action) {
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_ORPH_ATTACH:
+ /* Move ccw device to orphanage. */
+ rc = ccw_device_move_to_orph(cdev);
+ if (rc)
+ goto out;
break;
- case CIO_REVALIDATE:
- /* Device will be removed, so no notify necessary. */
- if (disc)
- /* Reprobe because immediate unregister might block. */
- action = REPROBE;
- else
- action = UNREGISTER_PROBE;
+ case IO_SCH_UNREG_ATTACH:
+ /* Unregister ccw device. */
+ ccw_device_unregister(cdev);
break;
- case CIO_OPER:
- if (disc)
- /* Get device operational again. */
- action = REPROBE;
+ default:
break;
}
- /* Perform action. */
- ret = 0;
+ /* Handle subchannel. */
switch (action) {
- case UNREGISTER:
- case UNREGISTER_PROBE:
- ccw_device_set_notoper(cdev);
- /* Unregister device (will use subchannel lock). */
- spin_unlock_irqrestore(sch->lock, flags);
+ case IO_SCH_ORPH_UNREG:
+ case IO_SCH_UNREG:
css_sch_device_unregister(sch);
- spin_lock_irqsave(sch->lock, flags);
break;
- case REPROBE:
+ case IO_SCH_ORPH_ATTACH:
+ case IO_SCH_UNREG_ATTACH:
+ case IO_SCH_ATTACH:
+ dev_id.ssid = sch->schid.ssid;
+ dev_id.devno = sch->schib.pmcw.dev;
+ cdev = get_ccwdev_by_dev_id(&dev_id);
+ if (!cdev) {
+ sch_create_and_recog_new_device(sch);
+ break;
+ }
+ rc = ccw_device_move_to_sch(cdev, sch);
+ if (rc) {
+ /* Release reference from get_ccwdev_by_dev_id() */
+ put_device(&cdev->dev);
+ goto out;
+ }
+ spin_lock_irqsave(sch->lock, flags);
ccw_device_trigger_reprobe(cdev);
- break;
- case DISC:
- ccw_device_set_disconnected(cdev);
+ spin_unlock_irqrestore(sch->lock, flags);
+ /* Release reference from get_ccwdev_by_dev_id() */
+ put_device(&cdev->dev);
break;
default:
break;
}
- spin_unlock_irqrestore(sch->lock, flags);
- /* Probe if necessary. */
- if (action == UNREGISTER_PROBE)
- ret = css_probe_device(sch->schid);
+ return 0;
- return ret;
+out_unlock:
+ spin_unlock_irqrestore(sch->lock, flags);
+out:
+ return rc;
}
#ifdef CONFIG_CCW_CONSOLE
@@ -1744,10 +1519,7 @@ static int ccw_device_console_enable(struct ccw_device *cdev,
sch->driver = &io_subchannel_driver;
/* Initialize the ccw_device structure. */
cdev->dev.parent= &sch->dev;
- rc = io_subchannel_recog(cdev, sch);
- if (rc)
- return rc;
-
+ io_subchannel_recog(cdev, sch);
/* Now wait for the async. recognition to come to an end. */
spin_lock_irq(cdev->ccwlock);
while (!dev_fsm_final_state(cdev))
@@ -1763,7 +1535,7 @@ static int ccw_device_console_enable(struct ccw_device *cdev,
rc = 0;
out_unlock:
spin_unlock_irq(cdev->ccwlock);
- return 0;
+ return rc;
}
struct ccw_device *
@@ -1919,7 +1691,7 @@ static int ccw_device_pm_prepare(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
- if (work_pending(&cdev->private->kick_work))
+ if (work_pending(&cdev->private->todo_work))
return -EAGAIN;
/* Fail while device is being set online/offline. */
if (atomic_read(&cdev->private->onoff))
@@ -2005,7 +1777,6 @@ static int ccw_device_pm_thaw(struct device *dev)
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;
@@ -2015,22 +1786,10 @@ static void __ccw_device_pm_restore(struct ccw_device *cdev)
*/
spin_lock_irq(sch->lock);
cdev->private->flags.resuming = 1;
- ret = ccw_device_recognition(cdev);
+ ccw_device_recognition(cdev);
spin_unlock_irq(sch->lock);
- if (ret) {
- CIO_MSG_EVENT(0, "Couldn't start recognition for device "
- "0.%x.%04x (ret=%d)\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno, 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;
}
@@ -2040,7 +1799,7 @@ 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);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
return -ENODEV;
}
@@ -2049,7 +1808,7 @@ 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);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
return -ENODEV;
}
@@ -2094,9 +1853,7 @@ static int ccw_device_pm_restore(struct device *dev)
/* 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);
+ ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
ret = -ENODEV;
goto out_unlock;
}
@@ -2140,7 +1897,7 @@ out_disc_unlock:
goto out_restore;
out_unreg_unlock:
- ccw_device_schedule_sch_unregister(cdev);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
ret = -ENODEV;
out_unlock:
spin_unlock_irq(sch->lock);
@@ -2205,6 +1962,77 @@ ccw_device_get_subchannel_id(struct ccw_device *cdev)
return sch->schid;
}
+static void ccw_device_todo(struct work_struct *work)
+{
+ struct ccw_device_private *priv;
+ struct ccw_device *cdev;
+ struct subchannel *sch;
+ enum cdev_todo todo;
+
+ priv = container_of(work, struct ccw_device_private, todo_work);
+ cdev = priv->cdev;
+ sch = to_subchannel(cdev->dev.parent);
+ /* Find out todo. */
+ spin_lock_irq(cdev->ccwlock);
+ todo = priv->todo;
+ priv->todo = CDEV_TODO_NOTHING;
+ CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
+ priv->dev_id.ssid, priv->dev_id.devno, todo);
+ spin_unlock_irq(cdev->ccwlock);
+ /* Perform todo. */
+ switch (todo) {
+ case CDEV_TODO_ENABLE_CMF:
+ cmf_reenable(cdev);
+ break;
+ case CDEV_TODO_REBIND:
+ ccw_device_do_unbind_bind(cdev);
+ break;
+ case CDEV_TODO_REGISTER:
+ io_subchannel_register(cdev);
+ break;
+ case CDEV_TODO_UNREG_EVAL:
+ if (!sch_is_pseudo_sch(sch))
+ css_schedule_eval(sch->schid);
+ /* fall-through */
+ case CDEV_TODO_UNREG:
+ if (sch_is_pseudo_sch(sch))
+ ccw_device_unregister(cdev);
+ else
+ ccw_device_call_sch_unregister(cdev);
+ break;
+ default:
+ break;
+ }
+ /* Release workqueue ref. */
+ put_device(&cdev->dev);
+}
+
+/**
+ * ccw_device_sched_todo - schedule ccw device operation
+ * @cdev: ccw device
+ * @todo: todo
+ *
+ * Schedule the operation identified by @todo to be performed on the slow path
+ * workqueue. Do nothing if another operation with higher priority is already
+ * scheduled. Needs to be called with ccwdev lock held.
+ */
+void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
+{
+ CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
+ cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
+ todo);
+ if (cdev->private->todo >= todo)
+ return;
+ cdev->private->todo = todo;
+ /* Get workqueue ref. */
+ if (!get_device(&cdev->dev))
+ return;
+ if (!queue_work(slow_path_wq, &cdev->private->todo_work)) {
+ /* Already queued, release workqueue ref. */
+ put_device(&cdev->dev);
+ }
+}
+
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_online);
EXPORT_SYMBOL(ccw_device_set_offline);
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index 246c6482842..bcfe13e4263 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -21,7 +21,6 @@ enum dev_state {
DEV_STATE_DISBAND_PGID,
DEV_STATE_BOXED,
/* states to wait for i/o completion before doing something */
- DEV_STATE_CLEAR_VERIFY,
DEV_STATE_TIMEOUT_KILL,
DEV_STATE_QUIESCE,
/* special states for devices gone not operational */
@@ -29,6 +28,7 @@ enum dev_state {
DEV_STATE_DISCONNECTED_SENSE_ID,
DEV_STATE_CMFCHANGE,
DEV_STATE_CMFUPDATE,
+ DEV_STATE_STEAL_LOCK,
/* last element! */
NR_DEV_STATES
};
@@ -81,17 +81,16 @@ void io_subchannel_init_config(struct subchannel *sch);
int ccw_device_cancel_halt_clear(struct ccw_device *);
-void ccw_device_do_unbind_bind(struct work_struct *);
-void ccw_device_move_to_orphanage(struct work_struct *);
int ccw_device_is_orphan(struct ccw_device *);
-int ccw_device_recognition(struct ccw_device *);
+void 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);
+void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
/* Function prototypes for device status and basic sense stuff. */
void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
@@ -99,24 +98,28 @@ void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
int ccw_device_do_sense(struct ccw_device *, struct irb *);
+/* Function prototype for internal request handling. */
+int lpm_adjust(int lpm, int mask);
+void ccw_request_start(struct ccw_device *);
+int ccw_request_cancel(struct ccw_device *cdev);
+void ccw_request_handler(struct ccw_device *cdev);
+void ccw_request_timeout(struct ccw_device *cdev);
+void ccw_request_notoper(struct ccw_device *cdev);
+
/* Function prototypes for sense id stuff. */
void ccw_device_sense_id_start(struct ccw_device *);
-void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
void ccw_device_sense_id_done(struct ccw_device *, int);
/* Function prototypes for path grouping stuff. */
-void ccw_device_sense_pgid_start(struct ccw_device *);
-void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
-void ccw_device_sense_pgid_done(struct ccw_device *, int);
-
void ccw_device_verify_start(struct ccw_device *);
-void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
void ccw_device_verify_done(struct ccw_device *, int);
void ccw_device_disband_start(struct ccw_device *);
-void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
void ccw_device_disband_done(struct ccw_device *, int);
+void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
+void ccw_device_stlck_done(struct ccw_device *, void *, int);
+
int ccw_device_call_handler(struct ccw_device *);
int ccw_device_stlck(struct ccw_device *);
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index b9613d7df9e..ae760658a13 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -229,8 +229,8 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
sch = to_subchannel(cdev->dev.parent);
- ccw_device_set_timeout(cdev, 0);
- cio_disable_subchannel(sch);
+ if (cio_disable_subchannel(sch))
+ state = DEV_STATE_NOT_OPER;
/*
* Now that we tried recognition, we have performed device selection
* through ssch() and the path information is up to date.
@@ -263,22 +263,10 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
}
switch (state) {
case DEV_STATE_NOT_OPER:
- CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
- "subchannel 0.%x.%04x\n",
- cdev->private->dev_id.devno,
- sch->schid.ssid, sch->schid.sch_no);
break;
case DEV_STATE_OFFLINE:
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;
}
cdev->private->state = DEV_STATE_OFFLINE;
@@ -289,16 +277,10 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
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);
+ ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
}
return;
case DEV_STATE_BOXED:
- CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
- " subchannel 0.%x.%04x\n",
- cdev->private->dev_id.devno,
- sch->schid.ssid, sch->schid.sch_no);
if (cdev->id.cu_type != 0) { /* device was recognized before */
cdev->private->flags.recog_done = 1;
cdev->private->state = DEV_STATE_BOXED;
@@ -343,28 +325,16 @@ int ccw_device_notify(struct ccw_device *cdev, int event)
return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
}
-static void cmf_reenable_delayed(struct work_struct *work)
-{
- struct ccw_device_private *priv;
- struct ccw_device *cdev;
-
- priv = container_of(work, struct ccw_device_private, kick_work);
- cdev = priv->cdev;
- cmf_reenable(cdev);
-}
-
static void ccw_device_oper_notify(struct ccw_device *cdev)
{
if (ccw_device_notify(cdev, CIO_OPER)) {
/* Reenable channel measurements, if needed. */
- PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed);
- queue_work(ccw_device_work, &cdev->private->kick_work);
+ ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
return;
}
/* Driver doesn't want device back. */
ccw_device_set_notoper(cdev);
- PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unbind_bind);
- queue_work(ccw_device_work, &cdev->private->kick_work);
+ ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
}
/*
@@ -392,14 +362,14 @@ ccw_device_done(struct ccw_device *cdev, int state)
CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
cdev->private->dev_id.devno, sch->schid.sch_no);
if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED))
- ccw_device_schedule_sch_unregister(cdev);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
cdev->private->flags.donotify = 0;
break;
case DEV_STATE_NOT_OPER:
CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
cdev->private->dev_id.devno, sch->schid.sch_no);
if (!ccw_device_notify(cdev, CIO_GONE))
- ccw_device_schedule_sch_unregister(cdev);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
else
ccw_device_set_disconnected(cdev);
cdev->private->flags.donotify = 0;
@@ -409,7 +379,7 @@ ccw_device_done(struct ccw_device *cdev, int state)
"%04x\n", cdev->private->dev_id.devno,
sch->schid.sch_no);
if (!ccw_device_notify(cdev, CIO_NO_PATH))
- ccw_device_schedule_sch_unregister(cdev);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
else
ccw_device_set_disconnected(cdev);
cdev->private->flags.donotify = 0;
@@ -425,107 +395,12 @@ ccw_device_done(struct ccw_device *cdev, int state)
wake_up(&cdev->private->wait_q);
}
-static int cmp_pgid(struct pgid *p1, struct pgid *p2)
-{
- char *c1;
- char *c2;
-
- c1 = (char *)p1;
- c2 = (char *)p2;
-
- return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
-}
-
-static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
-{
- int i;
- int last;
-
- last = 0;
- for (i = 0; i < 8; i++) {
- if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
- /* No PGID yet */
- continue;
- if (cdev->private->pgid[last].inf.ps.state1 ==
- SNID_STATE1_RESET) {
- /* First non-zero PGID */
- last = i;
- continue;
- }
- if (cmp_pgid(&cdev->private->pgid[i],
- &cdev->private->pgid[last]) == 0)
- /* Non-conflicting PGIDs */
- continue;
-
- /* PGID mismatch, can't pathgroup. */
- CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
- "0.%x.%04x, can't pathgroup\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno);
- cdev->private->options.pgroup = 0;
- return;
- }
- if (cdev->private->pgid[last].inf.ps.state1 ==
- SNID_STATE1_RESET)
- /* No previous pgid found */
- memcpy(&cdev->private->pgid[0],
- &channel_subsystems[0]->global_pgid,
- sizeof(struct pgid));
- else
- /* Use existing pgid */
- memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
- sizeof(struct pgid));
-}
-
-/*
- * Function called from device_pgid.c after sense path ground has completed.
- */
-void
-ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
-{
- struct subchannel *sch;
-
- sch = to_subchannel(cdev->dev.parent);
- switch (err) {
- case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
- cdev->private->options.pgroup = 0;
- break;
- case 0: /* success */
- case -EACCES: /* partial success, some paths not operational */
- /* Check if all pgids are equal or 0. */
- __ccw_device_get_common_pgid(cdev);
- break;
- case -ETIME: /* Sense path group id stopped by timeout. */
- case -EUSERS: /* device is reserved for someone else. */
- ccw_device_done(cdev, DEV_STATE_BOXED);
- return;
- default:
- ccw_device_done(cdev, DEV_STATE_NOT_OPER);
- return;
- }
- /* Start Path Group verification. */
- cdev->private->state = DEV_STATE_VERIFY;
- cdev->private->flags.doverify = 0;
- ccw_device_verify_start(cdev);
-}
-
/*
* Start device recognition.
*/
-int
-ccw_device_recognition(struct ccw_device *cdev)
+void ccw_device_recognition(struct ccw_device *cdev)
{
- struct subchannel *sch;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
- ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
- if (ret != 0)
- /* Couldn't enable the subchannel for i/o. Sick device. */
- return ret;
-
- /* After 60s the device recognition is considered to have failed. */
- ccw_device_set_timeout(cdev, 60*HZ);
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
/*
* We used to start here with a sense pgid to find out whether a device
@@ -537,32 +412,33 @@ ccw_device_recognition(struct ccw_device *cdev)
*/
cdev->private->flags.recog_done = 0;
cdev->private->state = DEV_STATE_SENSE_ID;
+ if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
+ ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
+ return;
+ }
ccw_device_sense_id_start(cdev);
- return 0;
}
/*
- * Handle timeout in device recognition.
+ * Handle events for states that use the ccw request infrastructure.
*/
-static void
-ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
+static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
{
- int ret;
-
- ret = ccw_device_cancel_halt_clear(cdev);
- switch (ret) {
- case 0:
- ccw_device_recog_done(cdev, DEV_STATE_BOXED);
+ switch (e) {
+ case DEV_EVENT_NOTOPER:
+ ccw_request_notoper(cdev);
break;
- case -ENODEV:
- ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
+ case DEV_EVENT_INTERRUPT:
+ ccw_request_handler(cdev);
+ break;
+ case DEV_EVENT_TIMEOUT:
+ ccw_request_timeout(cdev);
break;
default:
- ccw_device_set_timeout(cdev, 3*HZ);
+ break;
}
}
-
void
ccw_device_verify_done(struct ccw_device *cdev, int err)
{
@@ -571,21 +447,18 @@ ccw_device_verify_done(struct ccw_device *cdev, int err)
sch = to_subchannel(cdev->dev.parent);
/* Update schib - pom may have changed. */
if (cio_update_schib(sch)) {
- cdev->private->flags.donotify = 0;
- ccw_device_done(cdev, DEV_STATE_NOT_OPER);
- return;
+ err = -ENODEV;
+ goto callback;
}
/* Update lpm with verified path mask. */
sch->lpm = sch->vpm;
/* Repeat path verification? */
if (cdev->private->flags.doverify) {
- cdev->private->flags.doverify = 0;
ccw_device_verify_start(cdev);
return;
}
+callback:
switch (err) {
- case -EOPNOTSUPP: /* path grouping not supported, just set online. */
- cdev->private->options.pgroup = 0;
case 0:
ccw_device_done(cdev, DEV_STATE_ONLINE);
/* Deliver fake irb to device driver, if needed. */
@@ -604,18 +477,20 @@ ccw_device_verify_done(struct ccw_device *cdev, int err)
}
break;
case -ETIME:
+ case -EUSERS:
/* Reset oper notify indication after verify error. */
cdev->private->flags.donotify = 0;
ccw_device_done(cdev, DEV_STATE_BOXED);
break;
+ case -EACCES:
+ /* Reset oper notify indication after verify error. */
+ cdev->private->flags.donotify = 0;
+ ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
+ break;
default:
/* Reset oper notify indication after verify error. */
cdev->private->flags.donotify = 0;
- if (cdev->online) {
- ccw_device_set_timeout(cdev, 0);
- dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
- } else
- ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+ ccw_device_done(cdev, DEV_STATE_NOT_OPER);
break;
}
}
@@ -640,17 +515,9 @@ ccw_device_online(struct ccw_device *cdev)
dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
return ret;
}
- /* Do we want to do path grouping? */
- if (!cdev->private->options.pgroup) {
- /* Start initial path verification. */
- cdev->private->state = DEV_STATE_VERIFY;
- cdev->private->flags.doverify = 0;
- ccw_device_verify_start(cdev);
- return 0;
- }
- /* Do a SensePGID first. */
- cdev->private->state = DEV_STATE_SENSE_PGID;
- ccw_device_sense_pgid_start(cdev);
+ /* Start initial path verification. */
+ cdev->private->state = DEV_STATE_VERIFY;
+ ccw_device_verify_start(cdev);
return 0;
}
@@ -666,7 +533,6 @@ ccw_device_disband_done(struct ccw_device *cdev, int err)
break;
default:
cdev->private->flags.donotify = 0;
- dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
break;
}
@@ -703,7 +569,7 @@ ccw_device_offline(struct ccw_device *cdev)
if (cdev->private->state != DEV_STATE_ONLINE)
return -EINVAL;
/* Are we doing path grouping? */
- if (!cdev->private->options.pgroup) {
+ if (!cdev->private->flags.pgroup) {
/* No, set state offline immediately. */
ccw_device_done(cdev, DEV_STATE_OFFLINE);
return 0;
@@ -715,43 +581,13 @@ ccw_device_offline(struct ccw_device *cdev)
}
/*
- * Handle timeout in device online/offline process.
- */
-static void
-ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
-{
- int ret;
-
- ret = ccw_device_cancel_halt_clear(cdev);
- switch (ret) {
- case 0:
- ccw_device_done(cdev, DEV_STATE_BOXED);
- break;
- case -ENODEV:
- ccw_device_done(cdev, DEV_STATE_NOT_OPER);
- break;
- default:
- ccw_device_set_timeout(cdev, 3*HZ);
- }
-}
-
-/*
- * Handle not oper event in device recognition.
- */
-static void
-ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
-{
- ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
-}
-
-/*
* Handle not operational event in non-special state.
*/
static void ccw_device_generic_notoper(struct ccw_device *cdev,
enum dev_event dev_event)
{
if (!ccw_device_notify(cdev, CIO_GONE))
- ccw_device_schedule_sch_unregister(cdev);
+ ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
else
ccw_device_set_disconnected(cdev);
}
@@ -802,11 +638,27 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
}
/* Device is idle, we can do the path verification. */
cdev->private->state = DEV_STATE_VERIFY;
- cdev->private->flags.doverify = 0;
ccw_device_verify_start(cdev);
}
/*
+ * Handle path verification event in boxed state.
+ */
+static void ccw_device_boxed_verify(struct ccw_device *cdev,
+ enum dev_event dev_event)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ if (cdev->online) {
+ if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
+ ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+ else
+ ccw_device_online_verify(cdev, dev_event);
+ } else
+ css_schedule_eval(sch->schid);
+}
+
+/*
* Got an interrupt for a normal io (state online).
*/
static void
@@ -904,12 +756,6 @@ ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
*/
if (scsw_fctl(&irb->scsw) &
(SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
- /* Retry Basic Sense if requested. */
- if (cdev->private->flags.intretry) {
- cdev->private->flags.intretry = 0;
- ccw_device_do_sense(cdev, irb);
- return;
- }
cdev->private->flags.dosense = 0;
memset(&cdev->private->irb, 0, sizeof(struct irb));
ccw_device_accumulate_irb(cdev, irb);
@@ -933,21 +779,6 @@ call_handler:
}
static void
-ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
-{
- struct irb *irb;
-
- irb = (struct irb *) __LC_IRB;
- /* Accumulate status. We don't do basic sense. */
- ccw_device_accumulate_irb(cdev, irb);
- /* Remember to clear irb to avoid residuals. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
- /* Try to start delayed device verification. */
- ccw_device_online_verify(cdev, 0);
- /* Note: Don't call handler for cio initiated clear! */
-}
-
-static void
ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
struct subchannel *sch;
@@ -1004,32 +835,6 @@ ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
}
static void
-ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
-{
- struct irb *irb;
-
- switch (dev_event) {
- case DEV_EVENT_INTERRUPT:
- irb = (struct irb *) __LC_IRB;
- /* Check for unsolicited interrupt. */
- if ((scsw_stctl(&irb->scsw) ==
- (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
- (!scsw_cc(&irb->scsw)))
- /* FIXME: we should restart stlck here, but this
- * is extremely unlikely ... */
- goto out_wakeup;
-
- ccw_device_accumulate_irb(cdev, irb);
- /* We don't care about basic sense etc. */
- break;
- default: /* timeout */
- break;
- }
-out_wakeup:
- wake_up(&cdev->private->wait_q);
-}
-
-static void
ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
{
struct subchannel *sch;
@@ -1038,10 +843,6 @@ ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
/* Couldn't enable the subchannel for i/o. Sick device. */
return;
-
- /* After 60s the device recognition is considered to have failed. */
- ccw_device_set_timeout(cdev, 60*HZ);
-
cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
ccw_device_sense_id_start(cdev);
}
@@ -1072,22 +873,20 @@ void ccw_device_trigger_reprobe(struct ccw_device *cdev)
/* We should also udate ssd info, but this has to wait. */
/* Check if this is another device which appeared on the same sch. */
- if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
- PREPARE_WORK(&cdev->private->kick_work,
- ccw_device_move_to_orphanage);
- queue_work(slow_path_wq, &cdev->private->kick_work);
- } else
+ if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
+ css_schedule_eval(sch->schid);
+ else
ccw_device_start_id(cdev, 0);
}
-static void
-ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
+static void ccw_device_disabled_irq(struct ccw_device *cdev,
+ enum dev_event dev_event)
{
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
/*
- * An interrupt in state offline means a previous disable was not
+ * An interrupt in a disabled state means a previous disable was not
* successful - should not happen, but we try to disable again.
*/
cio_disable_subchannel(sch);
@@ -1113,10 +912,7 @@ static void
ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
{
ccw_device_set_timeout(cdev, 0);
- if (dev_event == DEV_EVENT_NOTOPER)
- cdev->private->state = DEV_STATE_NOT_OPER;
- else
- cdev->private->state = DEV_STATE_OFFLINE;
+ cdev->private->state = DEV_STATE_NOT_OPER;
wake_up(&cdev->private->wait_q);
}
@@ -1126,17 +922,11 @@ ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
int ret;
ret = ccw_device_cancel_halt_clear(cdev);
- switch (ret) {
- case 0:
- cdev->private->state = DEV_STATE_OFFLINE;
- wake_up(&cdev->private->wait_q);
- break;
- case -ENODEV:
+ if (ret == -EBUSY) {
+ ccw_device_set_timeout(cdev, HZ/10);
+ } else {
cdev->private->state = DEV_STATE_NOT_OPER;
wake_up(&cdev->private->wait_q);
- break;
- default:
- ccw_device_set_timeout(cdev, HZ/10);
}
}
@@ -1150,50 +940,37 @@ ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
}
/*
- * Bug operation action.
- */
-static void
-ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
-{
- CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
- "0.%x.%04x\n", cdev->private->state, dev_event,
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno);
- BUG();
-}
-
-/*
* device statemachine
*/
fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_STATE_NOT_OPER] = {
[DEV_EVENT_NOTOPER] = ccw_device_nop,
- [DEV_EVENT_INTERRUPT] = ccw_device_bug,
+ [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_SENSE_PGID] = {
- [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
- [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
+ [DEV_EVENT_NOTOPER] = ccw_device_request_event,
+ [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
+ [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_SENSE_ID] = {
- [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
- [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
+ [DEV_EVENT_NOTOPER] = ccw_device_request_event,
+ [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
+ [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_OFFLINE] = {
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
+ [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
[DEV_EVENT_VERIFY] = ccw_device_offline_verify,
},
[DEV_STATE_VERIFY] = {
- [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
- [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
+ [DEV_EVENT_NOTOPER] = ccw_device_request_event,
+ [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
+ [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_delay_verify,
},
[DEV_STATE_ONLINE] = {
@@ -1209,24 +986,18 @@ fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_EVENT_VERIFY] = ccw_device_online_verify,
},
[DEV_STATE_DISBAND_PGID] = {
- [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
- [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
+ [DEV_EVENT_NOTOPER] = ccw_device_request_event,
+ [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
+ [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_BOXED] = {
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
- [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
- [DEV_EVENT_VERIFY] = ccw_device_nop,
- },
- /* states to wait for i/o completion before doing something */
- [DEV_STATE_CLEAR_VERIFY] = {
- [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
+ [DEV_EVENT_INTERRUPT] = ccw_device_nop,
[DEV_EVENT_TIMEOUT] = ccw_device_nop,
- [DEV_EVENT_VERIFY] = ccw_device_nop,
+ [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
},
+ /* states to wait for i/o completion before doing something */
[DEV_STATE_TIMEOUT_KILL] = {
[DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
[DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
@@ -1243,13 +1014,13 @@ fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_STATE_DISCONNECTED] = {
[DEV_EVENT_NOTOPER] = ccw_device_nop,
[DEV_EVENT_INTERRUPT] = ccw_device_start_id,
- [DEV_EVENT_TIMEOUT] = ccw_device_bug,
+ [DEV_EVENT_TIMEOUT] = ccw_device_nop,
[DEV_EVENT_VERIFY] = ccw_device_start_id,
},
[DEV_STATE_DISCONNECTED_SENSE_ID] = {
- [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
- [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
- [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
+ [DEV_EVENT_NOTOPER] = ccw_device_request_event,
+ [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
+ [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_CMFCHANGE] = {
@@ -1264,6 +1035,12 @@ fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
[DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
},
+ [DEV_STATE_STEAL_LOCK] = {
+ [DEV_EVENT_NOTOPER] = ccw_device_request_event,
+ [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
+ [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
+ [DEV_EVENT_VERIFY] = ccw_device_nop,
+ },
};
EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index 1bdaa614e34..78a0b43862c 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -1,40 +1,39 @@
/*
- * drivers/s390/cio/device_id.c
+ * CCW device SENSE ID I/O handling.
*
- * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
- * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
- * Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * Sense ID functions.
+ * Copyright IBM Corp. 2002,2009
+ * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
-#include <linux/module.h>
-#include <linux/init.h>
#include <linux/kernel.h>
-
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/errno.h>
#include <asm/ccwdev.h>
-#include <asm/delay.h>
+#include <asm/setup.h>
#include <asm/cio.h>
-#include <asm/lowcore.h>
#include <asm/diag.h>
#include "cio.h"
#include "cio_debug.h"
-#include "css.h"
#include "device.h"
-#include "ioasm.h"
#include "io_sch.h"
+#define SENSE_ID_RETRIES 256
+#define SENSE_ID_TIMEOUT (10 * HZ)
+#define SENSE_ID_MIN_LEN 4
+#define SENSE_ID_BASIC_LEN 7
+
/**
- * vm_vdev_to_cu_type - Convert vm virtual device into control unit type
- * for certain devices.
- * @class: virtual device class
- * @type: virtual device type
+ * diag210_to_senseid - convert diag 0x210 data to sense id information
+ * @senseid: sense id
+ * @diag: diag 0x210 data
*
- * Returns control unit type if a match was made or %0xffff otherwise.
+ * Return 0 on success, non-zero otherwise.
*/
-static int vm_vdev_to_cu_type(int class, int type)
+static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
{
static struct {
int class, type, cu_type;
@@ -71,253 +70,153 @@ static int vm_vdev_to_cu_type(int class, int type)
};
int i;
- for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
- if (class == vm_devices[i].class && type == vm_devices[i].type)
- return vm_devices[i].cu_type;
+ /* Special case for osa devices. */
+ if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
+ senseid->cu_type = 0x3088;
+ senseid->cu_model = 0x60;
+ senseid->reserved = 0xff;
+ return 0;
+ }
+ for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
+ if (diag->vrdcvcla == vm_devices[i].class &&
+ diag->vrdcvtyp == vm_devices[i].type) {
+ senseid->cu_type = vm_devices[i].cu_type;
+ senseid->reserved = 0xff;
+ return 0;
+ }
+ }
- return 0xffff;
+ return -ENODEV;
}
/**
- * diag_get_dev_info - retrieve device information via DIAG X'210'
- * @devno: device number
- * @ps: pointer to sense ID data area
+ * diag_get_dev_info - retrieve device information via diag 0x210
+ * @cdev: ccw device
*
* Returns zero on success, non-zero otherwise.
*/
-static int diag_get_dev_info(u16 devno, struct senseid *ps)
+static int diag210_get_dev_info(struct ccw_device *cdev)
{
+ struct ccw_dev_id *dev_id = &cdev->private->dev_id;
+ struct senseid *senseid = &cdev->private->senseid;
struct diag210 diag_data;
- int ccode;
-
- CIO_TRACE_EVENT (4, "VMvdinf");
-
- diag_data = (struct diag210) {
- .vrdcdvno = devno,
- .vrdclen = sizeof (diag_data),
- };
-
- ccode = diag210 (&diag_data);
- if ((ccode == 0) || (ccode == 2)) {
- ps->reserved = 0xff;
-
- /* Special case for osa devices. */
- if (diag_data.vrdcvcla == 0x02 && diag_data.vrdcvtyp == 0x20) {
- ps->cu_type = 0x3088;
- ps->cu_model = 0x60;
- return 0;
- }
- ps->cu_type = vm_vdev_to_cu_type(diag_data.vrdcvcla,
- diag_data.vrdcvtyp);
- if (ps->cu_type != 0xffff)
- return 0;
- }
-
- CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
- "vdev class : %02X, vdev type : %04X \n ... "
- "rdev class : %02X, rdev type : %04X, "
- "rdev model: %02X\n",
- devno, ccode,
- diag_data.vrdcvcla, diag_data.vrdcvtyp,
- diag_data.vrdcrccl, diag_data.vrdccrty,
- diag_data.vrdccrmd);
-
+ int rc;
+
+ if (dev_id->ssid != 0)
+ return -ENODEV;
+ memset(&diag_data, 0, sizeof(diag_data));
+ diag_data.vrdcdvno = dev_id->devno;
+ diag_data.vrdclen = sizeof(diag_data);
+ rc = diag210(&diag_data);
+ CIO_TRACE_EVENT(4, "diag210");
+ CIO_HEX_EVENT(4, &rc, sizeof(rc));
+ CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
+ if (rc != 0 && rc != 2)
+ goto err_failed;
+ if (diag210_to_senseid(senseid, &diag_data))
+ goto err_unknown;
+ return 0;
+
+err_unknown:
+ CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
+ dev_id->ssid, dev_id->devno);
+ return -ENODEV;
+err_failed:
+ CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
+ dev_id->ssid, dev_id->devno, rc);
return -ENODEV;
}
/*
- * Start Sense ID helper function.
- * Try to obtain the 'control unit'/'device type' information
- * associated with the subchannel.
+ * Initialize SENSE ID data.
*/
-static int
-__ccw_device_sense_id_start(struct ccw_device *cdev)
-{
- struct subchannel *sch;
- struct ccw1 *ccw;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
- /* Setup sense channel program. */
- ccw = cdev->private->iccws;
- ccw->cmd_code = CCW_CMD_SENSE_ID;
- ccw->cda = (__u32) __pa (&cdev->private->senseid);
- ccw->count = sizeof (struct senseid);
- ccw->flags = CCW_FLAG_SLI;
-
- /* Reset device status. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
-
- /* Try on every path. */
- ret = -ENODEV;
- while (cdev->private->imask != 0) {
- cdev->private->senseid.cu_type = 0xFFFF;
- if ((sch->opm & cdev->private->imask) != 0 &&
- cdev->private->iretry > 0) {
- cdev->private->iretry--;
- /* Reset internal retry indication. */
- cdev->private->flags.intretry = 0;
- ret = cio_start (sch, cdev->private->iccws,
- cdev->private->imask);
- /* ret is 0, -EBUSY, -EACCES or -ENODEV */
- if (ret != -EACCES)
- return ret;
- }
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- }
- return ret;
-}
-
-void
-ccw_device_sense_id_start(struct ccw_device *cdev)
+static void snsid_init(struct ccw_device *cdev)
{
- int ret;
-
- memset (&cdev->private->senseid, 0, sizeof (struct senseid));
- cdev->private->imask = 0x80;
- cdev->private->iretry = 5;
- ret = __ccw_device_sense_id_start(cdev);
- if (ret && ret != -EBUSY)
- ccw_device_sense_id_done(cdev, ret);
+ cdev->private->flags.esid = 0;
+ memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
+ cdev->private->senseid.cu_type = 0xffff;
}
/*
- * Called from interrupt context to check if a valid answer
- * to Sense ID was received.
+ * Check for complete SENSE ID data.
*/
-static int
-ccw_device_check_sense_id(struct ccw_device *cdev)
+static int snsid_check(struct ccw_device *cdev, void *data)
{
- struct subchannel *sch;
- struct irb *irb;
-
- sch = to_subchannel(cdev->dev.parent);
- irb = &cdev->private->irb;
-
- /* Check the error cases. */
- if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
- /* Retry Sense ID if requested. */
- if (cdev->private->flags.intretry) {
- cdev->private->flags.intretry = 0;
- return -EAGAIN;
- }
- return -ETIME;
- }
- if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
- /*
- * if the device doesn't support the SenseID
- * command further retries wouldn't help ...
- * NB: We don't check here for intervention required like we
- * did before, because tape devices with no tape inserted
- * may present this status *in conjunction with* the
- * sense id information. So, for intervention required,
- * we use the "whack it until it talks" strategy...
- */
- CIO_MSG_EVENT(0, "SenseID : device %04x on Subchannel "
- "0.%x.%04x reports cmd reject\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no);
+ struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
+ int len = sizeof(struct senseid) - scsw->count;
+
+ /* Check for incomplete SENSE ID data. */
+ if (len < SENSE_ID_MIN_LEN)
+ goto out_restart;
+ if (cdev->private->senseid.cu_type == 0xffff)
+ goto out_restart;
+ /* Check for incompatible SENSE ID data. */
+ if (cdev->private->senseid.reserved != 0xff)
return -EOPNOTSUPP;
- }
- if (irb->esw.esw0.erw.cons) {
- CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
- "lpum %02X, cnt %02d, sns :"
- " %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno,
- irb->esw.esw0.sublog.lpum,
- irb->esw.esw0.erw.scnt,
- irb->ecw[0], irb->ecw[1],
- irb->ecw[2], irb->ecw[3],
- irb->ecw[4], irb->ecw[5],
- irb->ecw[6], irb->ecw[7]);
- return -EAGAIN;
- }
- if (irb->scsw.cmd.cc == 3) {
- u8 lpm;
+ /* Check for extended-identification information. */
+ if (len > SENSE_ID_BASIC_LEN)
+ cdev->private->flags.esid = 1;
+ return 0;
- lpm = to_io_private(sch)->orb.cmd.lpm;
- if ((lpm & sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
- CIO_MSG_EVENT(4, "SenseID : path %02X for device %04x "
- "on subchannel 0.%x.%04x is "
- "'not operational'\n", lpm,
- cdev->private->dev_id.devno,
- sch->schid.ssid, sch->schid.sch_no);
- return -EACCES;
- }
-
- /* Did we get a proper answer ? */
- if (irb->scsw.cmd.cc == 0 && cdev->private->senseid.cu_type != 0xFFFF &&
- cdev->private->senseid.reserved == 0xFF) {
- if (irb->scsw.cmd.count < sizeof(struct senseid) - 8)
- cdev->private->flags.esid = 1;
- return 0; /* Success */
- }
-
- /* Hmm, whatever happened, try again. */
- CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
- "subchannel 0.%x.%04x returns status %02X%02X\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no,
- irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
+out_restart:
+ snsid_init(cdev);
return -EAGAIN;
}
/*
- * Got interrupt for Sense ID.
+ * Process SENSE ID request result.
*/
-void
-ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
+static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
{
- struct subchannel *sch;
- struct irb *irb;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
- irb = (struct irb *) __LC_IRB;
- /* Retry sense id, if needed. */
- if (irb->scsw.cmd.stctl ==
- (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if ((irb->scsw.cmd.cc == 1) || !irb->scsw.cmd.actl) {
- ret = __ccw_device_sense_id_start(cdev);
- if (ret && ret != -EBUSY)
- ccw_device_sense_id_done(cdev, ret);
+ struct ccw_dev_id *id = &cdev->private->dev_id;
+ struct senseid *senseid = &cdev->private->senseid;
+ int vm = 0;
+
+ if (rc && MACHINE_IS_VM) {
+ /* Try diag 0x210 fallback on z/VM. */
+ snsid_init(cdev);
+ if (diag210_get_dev_info(cdev) == 0) {
+ rc = 0;
+ vm = 1;
}
- return;
}
- if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
- return;
- ret = ccw_device_check_sense_id(cdev);
- memset(&cdev->private->irb, 0, sizeof(struct irb));
- switch (ret) {
- /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
- case 0: /* Sense id succeeded. */
- case -ETIME: /* Sense id stopped by timeout. */
- ccw_device_sense_id_done(cdev, ret);
- break;
- case -EACCES: /* channel is not operational. */
- sch->lpm &= ~cdev->private->imask;
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- /* fall through. */
- case -EAGAIN: /* try again. */
- ret = __ccw_device_sense_id_start(cdev);
- if (ret == 0 || ret == -EBUSY)
- break;
- /* fall through. */
- default: /* Sense ID failed. Try asking VM. */
- if (MACHINE_IS_VM)
- ret = diag_get_dev_info(cdev->private->dev_id.devno,
- &cdev->private->senseid);
- else
- /*
- * If we can't couldn't identify the device type we
- * consider the device "not operational".
- */
- ret = -ENODEV;
+ CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
+ "%04x/%02x%s\n", id->ssid, id->devno, rc,
+ senseid->cu_type, senseid->cu_model, senseid->dev_type,
+ senseid->dev_model, vm ? " (diag210)" : "");
+ ccw_device_sense_id_done(cdev, rc);
+}
- ccw_device_sense_id_done(cdev, ret);
- break;
- }
+/**
+ * ccw_device_sense_id_start - perform SENSE ID
+ * @cdev: ccw device
+ *
+ * Execute a SENSE ID channel program on @cdev to update its sense id
+ * information. When finished, call ccw_device_sense_id_done with a
+ * return code specifying the result.
+ */
+void ccw_device_sense_id_start(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+ struct ccw1 *cp = cdev->private->iccws;
+
+ CIO_TRACE_EVENT(4, "snsid");
+ CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
+ /* Data setup. */
+ snsid_init(cdev);
+ /* Channel program setup. */
+ cp->cmd_code = CCW_CMD_SENSE_ID;
+ cp->cda = (u32) (addr_t) &cdev->private->senseid;
+ cp->count = sizeof(struct senseid);
+ cp->flags = CCW_FLAG_SLI;
+ /* Request setup. */
+ memset(req, 0, sizeof(*req));
+ req->cp = cp;
+ req->timeout = SENSE_ID_TIMEOUT;
+ req->maxretries = SENSE_ID_RETRIES;
+ req->lpm = sch->schib.pmcw.pam & sch->opm;
+ req->check = snsid_check;
+ req->callback = snsid_callback;
+ ccw_request_start(cdev);
}
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 2d0efee8a29..6da84543dfe 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -11,6 +11,7 @@
#include <linux/list.h>
#include <linux/device.h>
#include <linux/delay.h>
+#include <linux/completion.h>
#include <asm/ccwdev.h>
#include <asm/idals.h>
@@ -46,6 +47,7 @@ int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
+ cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0;
return 0;
}
@@ -74,6 +76,7 @@ int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0;
cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0;
cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0;
+ cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0;
return 0;
}
@@ -90,9 +93,34 @@ void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0;
cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0;
cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
+ cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0;
}
/**
+ * ccw_device_is_pathgroup - determine if paths to this device are grouped
+ * @cdev: ccw device
+ *
+ * Return non-zero if there is a path group, zero otherwise.
+ */
+int ccw_device_is_pathgroup(struct ccw_device *cdev)
+{
+ return cdev->private->flags.pgroup;
+}
+EXPORT_SYMBOL(ccw_device_is_pathgroup);
+
+/**
+ * ccw_device_is_multipath - determine if device is operating in multipath mode
+ * @cdev: ccw device
+ *
+ * Return non-zero if device is operating in multipath mode, zero otherwise.
+ */
+int ccw_device_is_multipath(struct ccw_device *cdev)
+{
+ return cdev->private->flags.mpath;
+}
+EXPORT_SYMBOL(ccw_device_is_multipath);
+
+/**
* ccw_device_clear() - terminate I/O request processing
* @cdev: target ccw device
* @intparm: interruption parameter; value is only used if no I/O is
@@ -167,8 +195,7 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
- if (cdev->private->state == DEV_STATE_VERIFY ||
- cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
+ if (cdev->private->state == DEV_STATE_VERIFY) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
cdev->private->flags.fake_irb = 1;
@@ -478,74 +505,65 @@ __u8 ccw_device_get_path_mask(struct ccw_device *cdev)
return sch->lpm;
}
-/*
- * Try to break the lock on a boxed device.
- */
-int
-ccw_device_stlck(struct ccw_device *cdev)
-{
- void *buf, *buf2;
- unsigned long flags;
- struct subchannel *sch;
- int ret;
+struct stlck_data {
+ struct completion done;
+ int rc;
+};
- if (!cdev)
- return -ENODEV;
+void ccw_device_stlck_done(struct ccw_device *cdev, void *data, int rc)
+{
+ struct stlck_data *sdata = data;
- if (cdev->drv && !cdev->private->options.force)
- return -EINVAL;
+ sdata->rc = rc;
+ complete(&sdata->done);
+}
- sch = to_subchannel(cdev->dev.parent);
-
- CIO_TRACE_EVENT(2, "stl lock");
- CIO_TRACE_EVENT(2, dev_name(&cdev->dev));
+/*
+ * Perform unconditional reserve + release.
+ */
+int ccw_device_stlck(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct stlck_data data;
+ u8 *buffer;
+ int rc;
- buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
- if (!buf2) {
- kfree(buf);
- return -ENOMEM;
+ /* Check if steal lock operation is valid for this device. */
+ if (cdev->drv) {
+ if (!cdev->private->options.force)
+ return -EINVAL;
}
- spin_lock_irqsave(sch->lock, flags);
- ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
- if (ret)
- goto out_unlock;
- /*
- * Setup ccw. We chain an unconditional reserve and a release so we
- * only break the lock.
- */
- cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
- cdev->private->iccws[0].cda = (__u32) __pa(buf);
- cdev->private->iccws[0].count = 32;
- cdev->private->iccws[0].flags = CCW_FLAG_CC;
- cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
- cdev->private->iccws[1].cda = (__u32) __pa(buf2);
- cdev->private->iccws[1].count = 32;
- cdev->private->iccws[1].flags = 0;
- ret = cio_start(sch, cdev->private->iccws, 0);
- if (ret) {
- cio_disable_subchannel(sch); //FIXME: return code?
+ buffer = kzalloc(64, GFP_DMA | GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+ init_completion(&data.done);
+ data.rc = -EIO;
+ spin_lock_irq(sch->lock);
+ rc = cio_enable_subchannel(sch, (u32) (addr_t) sch);
+ if (rc)
goto out_unlock;
+ /* Perform operation. */
+ cdev->private->state = DEV_STATE_STEAL_LOCK,
+ ccw_device_stlck_start(cdev, &data, &buffer[0], &buffer[32]);
+ spin_unlock_irq(sch->lock);
+ /* Wait for operation to finish. */
+ if (wait_for_completion_interruptible(&data.done)) {
+ /* Got a signal. */
+ spin_lock_irq(sch->lock);
+ ccw_request_cancel(cdev);
+ spin_unlock_irq(sch->lock);
+ wait_for_completion(&data.done);
}
- cdev->private->irb.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
- spin_unlock_irqrestore(sch->lock, flags);
- wait_event(cdev->private->wait_q,
- cdev->private->irb.scsw.cmd.actl == 0);
- spin_lock_irqsave(sch->lock, flags);
- cio_disable_subchannel(sch); //FIXME: return code?
- if ((cdev->private->irb.scsw.cmd.dstat !=
- (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
- (cdev->private->irb.scsw.cmd.cstat != 0))
- ret = -EIO;
- /* Clear irb. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
+ rc = data.rc;
+ /* Check results. */
+ spin_lock_irq(sch->lock);
+ cio_disable_subchannel(sch);
+ cdev->private->state = DEV_STATE_BOXED;
out_unlock:
- kfree(buf);
- kfree(buf2);
- spin_unlock_irqrestore(sch->lock, flags);
- return ret;
+ spin_unlock_irq(sch->lock);
+ kfree(buffer);
+
+ return rc;
}
void *ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index fc5ca1dd52b..aad188e43b4 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -1,594 +1,561 @@
/*
- * drivers/s390/cio/device_pgid.c
+ * CCW device PGID and path verification I/O handling.
*
- * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
- * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
- * Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * Path Group ID functions.
+ * Copyright IBM Corp. 2002,2009
+ * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
-#include <linux/module.h>
-#include <linux/init.h>
-
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/bitops.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
-#include <asm/delay.h>
-#include <asm/lowcore.h>
#include "cio.h"
#include "cio_debug.h"
-#include "css.h"
#include "device.h"
-#include "ioasm.h"
#include "io_sch.h"
+#define PGID_RETRIES 256
+#define PGID_TIMEOUT (10 * HZ)
+
/*
- * Helper function called from interrupt context to decide whether an
- * operation should be tried again.
+ * Process path verification data and report result.
*/
-static int __ccw_device_should_retry(union scsw *scsw)
+static void verify_done(struct ccw_device *cdev, int rc)
{
- /* CC is only valid if start function bit is set. */
- if ((scsw->cmd.fctl & SCSW_FCTL_START_FUNC) && scsw->cmd.cc == 1)
- return 1;
- /* No more activity. For sense and set PGID we stubbornly try again. */
- if (!scsw->cmd.actl)
- return 1;
- return 0;
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_dev_id *id = &cdev->private->dev_id;
+ int mpath = cdev->private->flags.mpath;
+ int pgroup = cdev->private->flags.pgroup;
+
+ if (rc)
+ goto out;
+ /* Ensure consistent multipathing state at device and channel. */
+ if (sch->config.mp != mpath) {
+ sch->config.mp = mpath;
+ rc = cio_commit_config(sch);
+ }
+out:
+ CIO_MSG_EVENT(2, "vrfy: device 0.%x.%04x: rc=%d pgroup=%d mpath=%d "
+ "vpm=%02x\n", id->ssid, id->devno, rc, pgroup, mpath,
+ sch->vpm);
+ ccw_device_verify_done(cdev, rc);
}
/*
- * Start Sense Path Group ID helper function. Used in ccw_device_recog
- * and ccw_device_sense_pgid.
+ * Create channel program to perform a NOOP.
*/
-static int
-__ccw_device_sense_pgid_start(struct ccw_device *cdev)
+static void nop_build_cp(struct ccw_device *cdev)
{
- struct subchannel *sch;
- struct ccw1 *ccw;
- int ret;
- int i;
-
- sch = to_subchannel(cdev->dev.parent);
- /* Return if we already checked on all paths. */
- if (cdev->private->imask == 0)
- return (sch->lpm == 0) ? -ENODEV : -EACCES;
- i = 8 - ffs(cdev->private->imask);
-
- /* Setup sense path group id channel program. */
- ccw = cdev->private->iccws;
- ccw->cmd_code = CCW_CMD_SENSE_PGID;
- ccw->count = sizeof (struct pgid);
- ccw->flags = CCW_FLAG_SLI;
-
- /* Reset device status. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
- /* Try on every path. */
- ret = -ENODEV;
- while (cdev->private->imask != 0) {
- /* Try every path multiple times. */
- ccw->cda = (__u32) __pa (&cdev->private->pgid[i]);
- if (cdev->private->iretry > 0) {
- cdev->private->iretry--;
- /* Reset internal retry indication. */
- cdev->private->flags.intretry = 0;
- ret = cio_start (sch, cdev->private->iccws,
- cdev->private->imask);
- /* ret is 0, -EBUSY, -EACCES or -ENODEV */
- if (ret != -EACCES)
- return ret;
- CIO_MSG_EVENT(3, "SNID - Device %04x on Subchannel "
- "0.%x.%04x, lpm %02X, became 'not "
- "operational'\n",
- cdev->private->dev_id.devno,
- sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
-
- }
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- i++;
- }
-
- return ret;
+ struct ccw_request *req = &cdev->private->req;
+ struct ccw1 *cp = cdev->private->iccws;
+
+ cp->cmd_code = CCW_CMD_NOOP;
+ cp->cda = 0;
+ cp->count = 0;
+ cp->flags = CCW_FLAG_SLI;
+ req->cp = cp;
}
-void
-ccw_device_sense_pgid_start(struct ccw_device *cdev)
+/*
+ * Perform NOOP on a single path.
+ */
+static void nop_do(struct ccw_device *cdev)
{
- int ret;
-
- /* Set a timeout of 60s */
- ccw_device_set_timeout(cdev, 60*HZ);
-
- cdev->private->state = DEV_STATE_SENSE_PGID;
- cdev->private->imask = 0x80;
- cdev->private->iretry = 5;
- memset (&cdev->private->pgid, 0, sizeof (cdev->private->pgid));
- ret = __ccw_device_sense_pgid_start(cdev);
- if (ret && ret != -EBUSY)
- ccw_device_sense_pgid_done(cdev, ret);
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+
+ /* Adjust lpm. */
+ req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm);
+ if (!req->lpm)
+ goto out_nopath;
+ nop_build_cp(cdev);
+ ccw_request_start(cdev);
+ return;
+
+out_nopath:
+ verify_done(cdev, sch->vpm ? 0 : -EACCES);
}
/*
- * Called from interrupt context to check if a valid answer
- * to Sense Path Group ID was received.
+ * Adjust NOOP I/O status.
*/
-static int
-__ccw_device_check_sense_pgid(struct ccw_device *cdev)
+static enum io_status nop_filter(struct ccw_device *cdev, void *data,
+ struct irb *irb, enum io_status status)
{
- struct subchannel *sch;
- struct irb *irb;
- int i;
-
- sch = to_subchannel(cdev->dev.parent);
- irb = &cdev->private->irb;
- if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
- /* Retry Sense PGID if requested. */
- if (cdev->private->flags.intretry) {
- cdev->private->flags.intretry = 0;
- return -EAGAIN;
- }
- return -ETIME;
- }
- if (irb->esw.esw0.erw.cons &&
- (irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) {
- /*
- * If the device doesn't support the Sense Path Group ID
- * command further retries wouldn't help ...
- */
- return -EOPNOTSUPP;
- }
- if (irb->esw.esw0.erw.cons) {
- CIO_MSG_EVENT(2, "SNID - device 0.%x.%04x, unit check, "
- "lpum %02X, cnt %02d, sns : "
- "%02X%02X%02X%02X %02X%02X%02X%02X ...\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno,
- irb->esw.esw0.sublog.lpum,
- irb->esw.esw0.erw.scnt,
- irb->ecw[0], irb->ecw[1],
- irb->ecw[2], irb->ecw[3],
- irb->ecw[4], irb->ecw[5],
- irb->ecw[6], irb->ecw[7]);
- return -EAGAIN;
- }
- if (irb->scsw.cmd.cc == 3) {
- u8 lpm;
-
- lpm = to_io_private(sch)->orb.cmd.lpm;
- CIO_MSG_EVENT(3, "SNID - Device %04x on Subchannel 0.%x.%04x,"
- " lpm %02X, became 'not operational'\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, lpm);
- return -EACCES;
- }
- i = 8 - ffs(cdev->private->imask);
- if (cdev->private->pgid[i].inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
- CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel 0.%x.%04x "
- "is reserved by someone else\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no);
- return -EUSERS;
- }
- return 0;
+ /* Only subchannel status might indicate a path error. */
+ if (status == IO_STATUS_ERROR && irb->scsw.cmd.cstat == 0)
+ return IO_DONE;
+ return status;
}
/*
- * Got interrupt for Sense Path Group ID.
+ * Process NOOP request result for a single path.
*/
-void
-ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
+static void nop_callback(struct ccw_device *cdev, void *data, int rc)
{
- struct subchannel *sch;
- struct irb *irb;
- int ret;
-
- irb = (struct irb *) __LC_IRB;
-
- if (irb->scsw.cmd.stctl ==
- (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if (__ccw_device_should_retry(&irb->scsw)) {
- ret = __ccw_device_sense_pgid_start(cdev);
- if (ret && ret != -EBUSY)
- ccw_device_sense_pgid_done(cdev, ret);
- }
- return;
- }
- if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
- return;
- sch = to_subchannel(cdev->dev.parent);
- ret = __ccw_device_check_sense_pgid(cdev);
- memset(&cdev->private->irb, 0, sizeof(struct irb));
- switch (ret) {
- /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
- case -EOPNOTSUPP: /* Sense Path Group ID not supported */
- ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
- break;
- case -ETIME: /* Sense path group id stopped by timeout. */
- ccw_device_sense_pgid_done(cdev, -ETIME);
- break;
- case -EACCES: /* channel is not operational. */
- sch->lpm &= ~cdev->private->imask;
- /* Fall through. */
- case 0: /* Sense Path Group ID successful. */
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- /* Fall through. */
- case -EAGAIN: /* Try again. */
- ret = __ccw_device_sense_pgid_start(cdev);
- if (ret != 0 && ret != -EBUSY)
- ccw_device_sense_pgid_done(cdev, ret);
- break;
- case -EUSERS: /* device is reserved for someone else. */
- ccw_device_sense_pgid_done(cdev, -EUSERS);
- break;
- }
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+
+ if (rc == 0)
+ sch->vpm |= req->lpm;
+ else if (rc != -EACCES)
+ goto err;
+ req->lpm >>= 1;
+ nop_do(cdev);
+ return;
+
+err:
+ verify_done(cdev, rc);
}
/*
- * Path Group ID helper function.
+ * Create channel program to perform SET PGID on a single path.
*/
-static int
-__ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
+static void spid_build_cp(struct ccw_device *cdev, u8 fn)
{
- struct subchannel *sch;
- struct ccw1 *ccw;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
-
- /* Setup sense path group id channel program. */
- cdev->private->pgid[0].inf.fc = func;
- ccw = cdev->private->iccws;
- if (cdev->private->flags.pgid_single)
- cdev->private->pgid[0].inf.fc |= SPID_FUNC_SINGLE_PATH;
- else
- cdev->private->pgid[0].inf.fc |= SPID_FUNC_MULTI_PATH;
- ccw->cmd_code = CCW_CMD_SET_PGID;
- ccw->cda = (__u32) __pa (&cdev->private->pgid[0]);
- ccw->count = sizeof (struct pgid);
- ccw->flags = CCW_FLAG_SLI;
-
- /* Reset device status. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
-
- /* Try multiple times. */
- ret = -EACCES;
- if (cdev->private->iretry > 0) {
- cdev->private->iretry--;
- /* Reset internal retry indication. */
- cdev->private->flags.intretry = 0;
- ret = cio_start (sch, cdev->private->iccws,
- cdev->private->imask);
- /* We expect an interrupt in case of success or busy
- * indication. */
- if ((ret == 0) || (ret == -EBUSY))
- return ret;
- }
- /* PGID command failed on this path. */
- CIO_MSG_EVENT(3, "SPID - Device %04x on Subchannel "
- "0.%x.%04x, lpm %02X, became 'not operational'\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
- return ret;
+ struct ccw_request *req = &cdev->private->req;
+ struct ccw1 *cp = cdev->private->iccws;
+ int i = 8 - ffs(req->lpm);
+ struct pgid *pgid = &cdev->private->pgid[i];
+
+ pgid->inf.fc = fn;
+ cp->cmd_code = CCW_CMD_SET_PGID;
+ cp->cda = (u32) (addr_t) pgid;
+ cp->count = sizeof(*pgid);
+ cp->flags = CCW_FLAG_SLI;
+ req->cp = cp;
}
/*
- * Helper function to send a nop ccw down a path.
+ * Perform establish/resign SET PGID on a single path.
*/
-static int __ccw_device_do_nop(struct ccw_device *cdev)
+static void spid_do(struct ccw_device *cdev)
{
- struct subchannel *sch;
- struct ccw1 *ccw;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
-
- /* Setup nop channel program. */
- ccw = cdev->private->iccws;
- ccw->cmd_code = CCW_CMD_NOOP;
- ccw->cda = 0;
- ccw->count = 0;
- ccw->flags = CCW_FLAG_SLI;
-
- /* Reset device status. */
- memset(&cdev->private->irb, 0, sizeof(struct irb));
-
- /* Try multiple times. */
- ret = -EACCES;
- if (cdev->private->iretry > 0) {
- cdev->private->iretry--;
- /* Reset internal retry indication. */
- cdev->private->flags.intretry = 0;
- ret = cio_start (sch, cdev->private->iccws,
- cdev->private->imask);
- /* We expect an interrupt in case of success or busy
- * indication. */
- if ((ret == 0) || (ret == -EBUSY))
- return ret;
- }
- /* nop command failed on this path. */
- CIO_MSG_EVENT(3, "NOP - Device %04x on Subchannel "
- "0.%x.%04x, lpm %02X, became 'not operational'\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
- return ret;
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+ u8 fn;
+
+ /* Use next available path that is not already in correct state. */
+ req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & ~sch->vpm);
+ if (!req->lpm)
+ goto out_nopath;
+ /* Channel program setup. */
+ if (req->lpm & sch->opm)
+ fn = SPID_FUNC_ESTABLISH;
+ else
+ fn = SPID_FUNC_RESIGN;
+ if (cdev->private->flags.mpath)
+ fn |= SPID_FUNC_MULTI_PATH;
+ spid_build_cp(cdev, fn);
+ ccw_request_start(cdev);
+ return;
+
+out_nopath:
+ verify_done(cdev, sch->vpm ? 0 : -EACCES);
}
+static void verify_start(struct ccw_device *cdev);
/*
- * Called from interrupt context to check if a valid answer
- * to Set Path Group ID was received.
+ * Process SET PGID request result for a single path.
*/
-static int
-__ccw_device_check_pgid(struct ccw_device *cdev)
+static void spid_callback(struct ccw_device *cdev, void *data, int rc)
{
- struct subchannel *sch;
- struct irb *irb;
-
- sch = to_subchannel(cdev->dev.parent);
- irb = &cdev->private->irb;
- if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
- /* Retry Set PGID if requested. */
- if (cdev->private->flags.intretry) {
- cdev->private->flags.intretry = 0;
- return -EAGAIN;
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+
+ switch (rc) {
+ case 0:
+ sch->vpm |= req->lpm & sch->opm;
+ break;
+ case -EACCES:
+ break;
+ case -EOPNOTSUPP:
+ if (cdev->private->flags.mpath) {
+ /* Try without multipathing. */
+ cdev->private->flags.mpath = 0;
+ goto out_restart;
}
- return -ETIME;
+ /* Try without pathgrouping. */
+ cdev->private->flags.pgroup = 0;
+ goto out_restart;
+ default:
+ goto err;
}
- if (irb->esw.esw0.erw.cons) {
- if (irb->ecw[0] & SNS0_CMD_REJECT)
- return -EOPNOTSUPP;
- /* Hmm, whatever happened, try again. */
- CIO_MSG_EVENT(2, "SPID - device 0.%x.%04x, unit check, "
- "cnt %02d, "
- "sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
- cdev->private->dev_id.ssid,
- cdev->private->dev_id.devno,
- irb->esw.esw0.erw.scnt,
- irb->ecw[0], irb->ecw[1],
- irb->ecw[2], irb->ecw[3],
- irb->ecw[4], irb->ecw[5],
- irb->ecw[6], irb->ecw[7]);
- return -EAGAIN;
- }
- if (irb->scsw.cmd.cc == 3) {
- CIO_MSG_EVENT(3, "SPID - Device %04x on Subchannel 0.%x.%04x,"
- " lpm %02X, became 'not operational'\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
- return -EACCES;
- }
- return 0;
+ req->lpm >>= 1;
+ spid_do(cdev);
+ return;
+
+out_restart:
+ verify_start(cdev);
+ return;
+err:
+ verify_done(cdev, rc);
+}
+
+static void spid_start(struct ccw_device *cdev)
+{
+ struct ccw_request *req = &cdev->private->req;
+
+ /* Initialize request data. */
+ memset(req, 0, sizeof(*req));
+ req->timeout = PGID_TIMEOUT;
+ req->maxretries = PGID_RETRIES;
+ req->lpm = 0x80;
+ req->callback = spid_callback;
+ spid_do(cdev);
+}
+
+static int pgid_cmp(struct pgid *p1, struct pgid *p2)
+{
+ return memcmp((char *) p1 + 1, (char *) p2 + 1,
+ sizeof(struct pgid) - 1);
}
/*
- * Called from interrupt context to check the path status after a nop has
- * been send.
+ * Determine pathgroup state from PGID data.
*/
-static int __ccw_device_check_nop(struct ccw_device *cdev)
+static void pgid_analyze(struct ccw_device *cdev, struct pgid **p,
+ int *mismatch, int *reserved, int *reset)
{
- struct subchannel *sch;
- struct irb *irb;
-
- sch = to_subchannel(cdev->dev.parent);
- irb = &cdev->private->irb;
- if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
- /* Retry NOP if requested. */
- if (cdev->private->flags.intretry) {
- cdev->private->flags.intretry = 0;
- return -EAGAIN;
+ struct pgid *pgid = &cdev->private->pgid[0];
+ struct pgid *first = NULL;
+ int lpm;
+ int i;
+
+ *mismatch = 0;
+ *reserved = 0;
+ *reset = 0;
+ for (i = 0, lpm = 0x80; i < 8; i++, pgid++, lpm >>= 1) {
+ if ((cdev->private->pgid_valid_mask & lpm) == 0)
+ continue;
+ if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE)
+ *reserved = 1;
+ if (pgid->inf.ps.state1 == SNID_STATE1_RESET) {
+ /* A PGID was reset. */
+ *reset = 1;
+ continue;
}
- return -ETIME;
- }
- if (irb->scsw.cmd.cc == 3) {
- CIO_MSG_EVENT(3, "NOP - Device %04x on Subchannel 0.%x.%04x,"
- " lpm %02X, became 'not operational'\n",
- cdev->private->dev_id.devno, sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
- return -EACCES;
+ if (!first) {
+ first = pgid;
+ continue;
+ }
+ if (pgid_cmp(pgid, first) != 0)
+ *mismatch = 1;
}
- return 0;
+ if (!first)
+ first = &channel_subsystems[0]->global_pgid;
+ *p = first;
}
-static void
-__ccw_device_verify_start(struct ccw_device *cdev)
+static u8 pgid_to_vpm(struct ccw_device *cdev)
{
- struct subchannel *sch;
- __u8 func;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
- /* Repeat for all paths. */
- for (; cdev->private->imask; cdev->private->imask >>= 1,
- cdev->private->iretry = 5) {
- if ((cdev->private->imask & sch->schib.pmcw.pam) == 0)
- /* Path not available, try next. */
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct pgid *pgid;
+ int i;
+ int lpm;
+ u8 vpm = 0;
+
+ /* Set VPM bits for paths which are already in the target state. */
+ for (i = 0; i < 8; i++) {
+ lpm = 0x80 >> i;
+ if ((cdev->private->pgid_valid_mask & lpm) == 0)
continue;
- if (cdev->private->options.pgroup) {
- if (sch->opm & cdev->private->imask)
- func = SPID_FUNC_ESTABLISH;
- else
- func = SPID_FUNC_RESIGN;
- ret = __ccw_device_do_pgid(cdev, func);
- } else
- ret = __ccw_device_do_nop(cdev);
- /* We expect an interrupt in case of success or busy
- * indication. */
- if (ret == 0 || ret == -EBUSY)
- return;
- /* Permanent path failure, try next. */
+ pgid = &cdev->private->pgid[i];
+ if (sch->opm & lpm) {
+ if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED)
+ continue;
+ } else {
+ if (pgid->inf.ps.state1 != SNID_STATE1_UNGROUPED)
+ continue;
+ }
+ if (cdev->private->flags.mpath) {
+ if (pgid->inf.ps.state3 != SNID_STATE3_MULTI_PATH)
+ continue;
+ } else {
+ if (pgid->inf.ps.state3 != SNID_STATE3_SINGLE_PATH)
+ continue;
+ }
+ vpm |= lpm;
}
- /* Done with all paths. */
- ccw_device_verify_done(cdev, (sch->vpm != 0) ? 0 : -ENODEV);
+
+ return vpm;
}
-
-/*
- * Got interrupt for Set Path Group ID.
- */
-void
-ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
+
+static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid)
{
- struct subchannel *sch;
- struct irb *irb;
- int ret;
+ int i;
- irb = (struct irb *) __LC_IRB;
+ for (i = 0; i < 8; i++)
+ memcpy(&cdev->private->pgid[i], pgid, sizeof(struct pgid));
+}
- if (irb->scsw.cmd.stctl ==
- (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if (__ccw_device_should_retry(&irb->scsw))
- __ccw_device_verify_start(cdev);
- return;
+/*
+ * Process SENSE PGID data and report result.
+ */
+static void snid_done(struct ccw_device *cdev, int rc)
+{
+ struct ccw_dev_id *id = &cdev->private->dev_id;
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct pgid *pgid;
+ int mismatch = 0;
+ int reserved = 0;
+ int reset = 0;
+
+ if (rc)
+ goto out;
+ pgid_analyze(cdev, &pgid, &mismatch, &reserved, &reset);
+ if (reserved)
+ rc = -EUSERS;
+ else if (mismatch)
+ rc = -EOPNOTSUPP;
+ else {
+ sch->vpm = pgid_to_vpm(cdev);
+ pgid_fill(cdev, pgid);
}
- if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
- return;
- sch = to_subchannel(cdev->dev.parent);
- if (cdev->private->options.pgroup)
- ret = __ccw_device_check_pgid(cdev);
- else
- ret = __ccw_device_check_nop(cdev);
- memset(&cdev->private->irb, 0, sizeof(struct irb));
-
- switch (ret) {
- /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
+out:
+ CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x vpm=%02x "
+ "mism=%d rsvd=%d reset=%d\n", id->ssid, id->devno, rc,
+ cdev->private->pgid_valid_mask, sch->vpm, mismatch,
+ reserved, reset);
+ switch (rc) {
case 0:
- /* Path verification ccw finished successfully, update lpm. */
- sch->vpm |= sch->opm & cdev->private->imask;
- /* Go on with next path. */
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- __ccw_device_verify_start(cdev);
+ /* Anything left to do? */
+ if (sch->vpm == sch->schib.pmcw.pam) {
+ verify_done(cdev, sch->vpm == 0 ? -EACCES : 0);
+ return;
+ }
+ /* Perform path-grouping. */
+ spid_start(cdev);
break;
case -EOPNOTSUPP:
- /*
- * One of those strange devices which claim to be able
- * to do multipathing but not for Set Path Group ID.
- */
- if (cdev->private->flags.pgid_single)
- cdev->private->options.pgroup = 0;
- else
- cdev->private->flags.pgid_single = 1;
- /* Retry */
- sch->vpm = 0;
- cdev->private->imask = 0x80;
- cdev->private->iretry = 5;
- /* fall through. */
- case -EAGAIN: /* Try again. */
- __ccw_device_verify_start(cdev);
- break;
- case -ETIME: /* Set path group id stopped by timeout. */
- ccw_device_verify_done(cdev, -ETIME);
- break;
- case -EACCES: /* channel is not operational. */
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- __ccw_device_verify_start(cdev);
+ /* Path-grouping not supported. */
+ cdev->private->flags.pgroup = 0;
+ cdev->private->flags.mpath = 0;
+ verify_start(cdev);
break;
+ default:
+ verify_done(cdev, rc);
}
}
-void
-ccw_device_verify_start(struct ccw_device *cdev)
+/*
+ * Create channel program to perform a SENSE PGID on a single path.
+ */
+static void snid_build_cp(struct ccw_device *cdev)
+{
+ struct ccw_request *req = &cdev->private->req;
+ struct ccw1 *cp = cdev->private->iccws;
+ int i = 8 - ffs(req->lpm);
+
+ /* Channel program setup. */
+ cp->cmd_code = CCW_CMD_SENSE_PGID;
+ cp->cda = (u32) (addr_t) &cdev->private->pgid[i];
+ cp->count = sizeof(struct pgid);
+ cp->flags = CCW_FLAG_SLI;
+ req->cp = cp;
+}
+
+/*
+ * Perform SENSE PGID on a single path.
+ */
+static void snid_do(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+
+ /* Adjust lpm if paths are not set in pam. */
+ req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam);
+ if (!req->lpm)
+ goto out_nopath;
+ snid_build_cp(cdev);
+ ccw_request_start(cdev);
+ return;
+
+out_nopath:
+ snid_done(cdev, cdev->private->pgid_valid_mask ? 0 : -EACCES);
+}
- cdev->private->flags.pgid_single = 0;
- cdev->private->imask = 0x80;
- cdev->private->iretry = 5;
+/*
+ * Process SENSE PGID request result for single path.
+ */
+static void snid_callback(struct ccw_device *cdev, void *data, int rc)
+{
+ struct ccw_request *req = &cdev->private->req;
+
+ if (rc == 0)
+ cdev->private->pgid_valid_mask |= req->lpm;
+ else if (rc != -EACCES)
+ goto err;
+ req->lpm >>= 1;
+ snid_do(cdev);
+ return;
+
+err:
+ snid_done(cdev, rc);
+}
- /* Start with empty vpm. */
- sch->vpm = 0;
+/*
+ * Perform path verification.
+ */
+static void verify_start(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+ struct ccw_dev_id *devid = &cdev->private->dev_id;
- /* Get current pam. */
- if (cio_update_schib(sch)) {
- ccw_device_verify_done(cdev, -ENODEV);
- return;
+ sch->vpm = 0;
+ /* Initialize request data. */
+ memset(req, 0, sizeof(*req));
+ req->timeout = PGID_TIMEOUT;
+ req->maxretries = PGID_RETRIES;
+ req->lpm = 0x80;
+ if (cdev->private->flags.pgroup) {
+ CIO_TRACE_EVENT(4, "snid");
+ CIO_HEX_EVENT(4, devid, sizeof(*devid));
+ req->callback = snid_callback;
+ snid_do(cdev);
+ } else {
+ CIO_TRACE_EVENT(4, "nop");
+ CIO_HEX_EVENT(4, devid, sizeof(*devid));
+ req->filter = nop_filter;
+ req->callback = nop_callback;
+ nop_do(cdev);
}
- /* After 60s path verification is considered to have failed. */
- ccw_device_set_timeout(cdev, 60*HZ);
- __ccw_device_verify_start(cdev);
}
-static void
-__ccw_device_disband_start(struct ccw_device *cdev)
+/**
+ * ccw_device_verify_start - perform path verification
+ * @cdev: ccw device
+ *
+ * Perform an I/O on each available channel path to @cdev to determine which
+ * paths are operational. The resulting path mask is stored in sch->vpm.
+ * If device options specify pathgrouping, establish a pathgroup for the
+ * operational paths. When finished, call ccw_device_verify_done with a
+ * return code specifying the result.
+ */
+void ccw_device_verify_start(struct ccw_device *cdev)
{
- struct subchannel *sch;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
- while (cdev->private->imask != 0) {
- if (sch->lpm & cdev->private->imask) {
- ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND);
- if (ret == 0)
- return;
- }
- cdev->private->iretry = 5;
- cdev->private->imask >>= 1;
- }
- ccw_device_disband_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
+ CIO_TRACE_EVENT(4, "vrfy");
+ CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
+ /* Initialize PGID data. */
+ memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
+ cdev->private->pgid_valid_mask = 0;
+ /*
+ * Initialize pathgroup and multipath state with target values.
+ * They may change in the course of path verification.
+ */
+ cdev->private->flags.pgroup = cdev->private->options.pgroup;
+ cdev->private->flags.mpath = cdev->private->options.mpath;
+ cdev->private->flags.doverify = 0;
+ verify_start(cdev);
}
/*
- * Got interrupt for Unset Path Group ID.
+ * Process disband SET PGID request result.
*/
-void
-ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
+static void disband_callback(struct ccw_device *cdev, void *data, int rc)
{
- struct subchannel *sch;
- struct irb *irb;
- int ret;
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_dev_id *id = &cdev->private->dev_id;
+
+ if (rc)
+ goto out;
+ /* Ensure consistent multipathing state at device and channel. */
+ cdev->private->flags.mpath = 0;
+ if (sch->config.mp) {
+ sch->config.mp = 0;
+ rc = cio_commit_config(sch);
+ }
+out:
+ CIO_MSG_EVENT(0, "disb: device 0.%x.%04x: rc=%d\n", id->ssid, id->devno,
+ rc);
+ ccw_device_disband_done(cdev, rc);
+}
- irb = (struct irb *) __LC_IRB;
+/**
+ * ccw_device_disband_start - disband pathgroup
+ * @cdev: ccw device
+ *
+ * Execute a SET PGID channel program on @cdev to disband a previously
+ * established pathgroup. When finished, call ccw_device_disband_done with
+ * a return code specifying the result.
+ */
+void ccw_device_disband_start(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+ u8 fn;
+
+ CIO_TRACE_EVENT(4, "disb");
+ CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
+ /* Request setup. */
+ memset(req, 0, sizeof(*req));
+ req->timeout = PGID_TIMEOUT;
+ req->maxretries = PGID_RETRIES;
+ req->lpm = sch->schib.pmcw.pam & sch->opm;
+ req->callback = disband_callback;
+ fn = SPID_FUNC_DISBAND;
+ if (cdev->private->flags.mpath)
+ fn |= SPID_FUNC_MULTI_PATH;
+ spid_build_cp(cdev, fn);
+ ccw_request_start(cdev);
+}
- if (irb->scsw.cmd.stctl ==
- (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
- if (__ccw_device_should_retry(&irb->scsw))
- __ccw_device_disband_start(cdev);
- return;
- }
- if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
- return;
- sch = to_subchannel(cdev->dev.parent);
- ret = __ccw_device_check_pgid(cdev);
- memset(&cdev->private->irb, 0, sizeof(struct irb));
- switch (ret) {
- /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
- case 0: /* disband successful. */
- ccw_device_disband_done(cdev, ret);
- break;
- case -EOPNOTSUPP:
- /*
- * One of those strange devices which claim to be able
- * to do multipathing but not for Unset Path Group ID.
- */
- cdev->private->flags.pgid_single = 1;
- /* fall through. */
- case -EAGAIN: /* Try again. */
- __ccw_device_disband_start(cdev);
- break;
- case -ETIME: /* Set path group id stopped by timeout. */
- ccw_device_disband_done(cdev, -ETIME);
- break;
- case -EACCES: /* channel is not operational. */
- cdev->private->imask >>= 1;
- cdev->private->iretry = 5;
- __ccw_device_disband_start(cdev);
- break;
- }
+static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2)
+{
+ struct ccw_request *req = &cdev->private->req;
+ struct ccw1 *cp = cdev->private->iccws;
+
+ cp[0].cmd_code = CCW_CMD_STLCK;
+ cp[0].cda = (u32) (addr_t) buf1;
+ cp[0].count = 32;
+ cp[0].flags = CCW_FLAG_CC;
+ cp[1].cmd_code = CCW_CMD_RELEASE;
+ cp[1].cda = (u32) (addr_t) buf2;
+ cp[1].count = 32;
+ cp[1].flags = 0;
+ req->cp = cp;
}
-void
-ccw_device_disband_start(struct ccw_device *cdev)
+static void stlck_callback(struct ccw_device *cdev, void *data, int rc)
{
- /* After 60s disbanding is considered to have failed. */
- ccw_device_set_timeout(cdev, 60*HZ);
+ ccw_device_stlck_done(cdev, data, rc);
+}
- cdev->private->flags.pgid_single = 0;
- cdev->private->iretry = 5;
- cdev->private->imask = 0x80;
- __ccw_device_disband_start(cdev);
+/**
+ * ccw_device_stlck_start - perform unconditional release
+ * @cdev: ccw device
+ * @data: data pointer to be passed to ccw_device_stlck_done
+ * @buf1: data pointer used in channel program
+ * @buf2: data pointer used in channel program
+ *
+ * Execute a channel program on @cdev to release an existing PGID reservation.
+ * When finished, call ccw_device_stlck_done with a return code specifying the
+ * result.
+ */
+void ccw_device_stlck_start(struct ccw_device *cdev, void *data, void *buf1,
+ void *buf2)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ struct ccw_request *req = &cdev->private->req;
+
+ CIO_TRACE_EVENT(4, "stlck");
+ CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
+ /* Request setup. */
+ memset(req, 0, sizeof(*req));
+ req->timeout = PGID_TIMEOUT;
+ req->maxretries = PGID_RETRIES;
+ req->lpm = sch->schib.pmcw.pam & sch->opm;
+ req->data = data;
+ req->callback = stlck_callback;
+ stlck_build_cp(cdev, buf1, buf2);
+ ccw_request_start(cdev);
}
+
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 5814dbee241..66d8066ef22 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -336,9 +336,6 @@ ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
sense_ccw->count = SENSE_MAX_COUNT;
sense_ccw->flags = CCW_FLAG_SLI;
- /* Reset internal retry indication. */
- cdev->private->flags.intretry = 0;
-
rc = cio_start(sch, sense_ccw, 0xff);
if (rc == -ENODEV || rc == -EACCES)
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h
index 0b8f381bd20..d72ae4c93af 100644
--- a/drivers/s390/cio/io_sch.h
+++ b/drivers/s390/cio/io_sch.h
@@ -1,7 +1,10 @@
#ifndef S390_IO_SCH_H
#define S390_IO_SCH_H
+#include <linux/types.h>
#include <asm/schid.h>
+#include <asm/ccwdev.h>
+#include "css.h"
/*
* command-mode operation request block
@@ -68,6 +71,52 @@ struct io_subchannel_private {
#define MAX_CIWS 8
/*
+ * Possible status values for a CCW request's I/O.
+ */
+enum io_status {
+ IO_DONE,
+ IO_RUNNING,
+ IO_STATUS_ERROR,
+ IO_PATH_ERROR,
+ IO_REJECTED,
+ IO_KILLED
+};
+
+/**
+ * ccw_request - Internal CCW request.
+ * @cp: channel program to start
+ * @timeout: maximum allowable time in jiffies between start I/O and interrupt
+ * @maxretries: number of retries per I/O operation and path
+ * @lpm: mask of paths to use
+ * @check: optional callback that determines if results are final
+ * @filter: optional callback to adjust request status based on IRB data
+ * @callback: final callback
+ * @data: user-defined pointer passed to all callbacks
+ * @mask: current path mask
+ * @retries: current number of retries
+ * @drc: delayed return code
+ * @cancel: non-zero if request was cancelled
+ * @done: non-zero if request was finished
+ */
+struct ccw_request {
+ struct ccw1 *cp;
+ unsigned long timeout;
+ u16 maxretries;
+ u8 lpm;
+ int (*check)(struct ccw_device *, void *);
+ enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
+ enum io_status);
+ void (*callback)(struct ccw_device *, void *, int);
+ void *data;
+ /* These fields are used internally. */
+ u16 mask;
+ u16 retries;
+ int drc;
+ int cancel:1;
+ int done:1;
+} __attribute__((packed));
+
+/*
* sense-id response buffer layout
*/
struct senseid {
@@ -82,32 +131,43 @@ struct senseid {
struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
} __attribute__ ((packed, aligned(4)));
+enum cdev_todo {
+ CDEV_TODO_NOTHING,
+ CDEV_TODO_ENABLE_CMF,
+ CDEV_TODO_REBIND,
+ CDEV_TODO_REGISTER,
+ CDEV_TODO_UNREG,
+ CDEV_TODO_UNREG_EVAL,
+};
+
struct ccw_device_private {
struct ccw_device *cdev;
struct subchannel *sch;
int state; /* device state */
atomic_t onoff;
- unsigned long registered;
struct ccw_dev_id dev_id; /* device id */
struct subchannel_id schid; /* subchannel number */
- u8 imask; /* lpm mask for SNID/SID/SPGID */
- int iretry; /* retry counter SNID/SID/SPGID */
+ struct ccw_request req; /* internal I/O request */
+ int iretry;
+ u8 pgid_valid_mask; /* mask of valid PGIDs */
struct {
unsigned int fast:1; /* post with "channel end" */
unsigned int repall:1; /* report every interrupt status */
unsigned int pgroup:1; /* do path grouping */
unsigned int force:1; /* allow forced online */
+ unsigned int mpath:1; /* do multipathing */
} __attribute__ ((packed)) options;
struct {
- unsigned int pgid_single:1; /* use single path for Set PGID */
unsigned int esid:1; /* Ext. SenseID supported by HW */
unsigned int dosense:1; /* delayed SENSE required */
unsigned int doverify:1; /* delayed path verification */
unsigned int donotify:1; /* call notify function */
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 */
+ unsigned int pgroup:1; /* pathgroup is set up */
+ unsigned int mpath:1; /* multipathing is set up */
+ unsigned int initialized:1; /* set if initial reference held */
} __attribute__((packed)) flags;
unsigned long intparm; /* user interruption parameter */
struct qdio_irq *qdio_data;
@@ -115,7 +175,8 @@ struct ccw_device_private {
struct senseid senseid; /* SenseID info */
struct pgid pgid[8]; /* path group IDs per chpid*/
struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
- struct work_struct kick_work;
+ struct work_struct todo_work;
+ enum cdev_todo todo;
wait_queue_head_t wait_q;
struct timer_list timer;
void *cmb; /* measurement information */