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authorSebastian Ott <sebott@linux.vnet.ibm.com>2013-04-13 12:53:21 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-04-17 14:07:30 +0200
commit188561a462d3b82451d6ba09e2e32c9ba2c9938c (patch)
treeced10861aad02cad5cac0e232c8c85964dd2dc1f
parent91c15a951091a64a5f048ff93292057e3b590b6f (diff)
downloadop-kernel-dev-188561a462d3b82451d6ba09e2e32c9ba2c9938c.zip
op-kernel-dev-188561a462d3b82451d6ba09e2e32c9ba2c9938c.tar.gz
s390/cio: wait_cons_dev don't use static variable
wait_cons_dev is used to busy wait for an interrupt on the console ccw device. Stop using the static console_subchannel and add a parameter to this function to specify on which ccw device/subchannel we have to do the polling. While at it rename the function to ccw_device_wait_idle and move it to device.c Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/asm/ccwdev.h1
-rw-r--r--arch/s390/include/asm/cio.h2
-rw-r--r--drivers/s390/char/con3215.c2
-rw-r--r--drivers/s390/char/raw3270.c4
-rw-r--r--drivers/s390/cio/cio.c20
-rw-r--r--drivers/s390/cio/cio.h1
-rw-r--r--drivers/s390/cio/device.c27
7 files changed, 32 insertions, 25 deletions
diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index e606161..cb56fb6 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -220,6 +220,7 @@ extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
extern struct ccw_device *ccw_device_probe_console(void);
+extern void ccw_device_wait_idle(struct ccw_device *);
extern int ccw_device_force_console(void);
int ccw_device_siosl(struct ccw_device *);
diff --git a/arch/s390/include/asm/cio.h b/arch/s390/include/asm/cio.h
index ad2b924..ffb8989 100644
--- a/arch/s390/include/asm/cio.h
+++ b/arch/s390/include/asm/cio.h
@@ -296,8 +296,6 @@ static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
return 0;
}
-extern void wait_cons_dev(void);
-
extern void css_schedule_reprobe(void);
extern void reipl_ccw_dev(struct ccw_dev_id *id);
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 7b00fa6..0d79eec 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -502,7 +502,7 @@ static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
raw3215_try_io(raw);
raw->flags &= ~RAW3215_FLUSHING;
#ifdef CONFIG_TN3215_CONSOLE
- wait_cons_dev();
+ ccw_device_wait_idle(raw->cdev);
#endif
/* Enough room freed up ? */
if (RAW3215_BUFFER_SIZE - raw->count >= length)
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c
index 4c9030a..383d643 100644
--- a/drivers/s390/char/raw3270.c
+++ b/drivers/s390/char/raw3270.c
@@ -796,7 +796,7 @@ struct raw3270 __init *raw3270_setup_console(struct ccw_device *cdev)
do {
__raw3270_reset_device(rp);
while (!raw3270_state_final(rp)) {
- wait_cons_dev();
+ ccw_device_wait_idle(rp->cdev);
barrier();
}
} while (rp->state != RAW3270_STATE_READY);
@@ -810,7 +810,7 @@ raw3270_wait_cons_dev(struct raw3270 *rp)
unsigned long flags;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
- wait_cons_dev();
+ ccw_device_wait_idle(rp->cdev);
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
}
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 986ef6a..2c1d53f 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -656,9 +656,9 @@ static int console_subchannel_in_use;
/*
* Use cio_tsch to update the subchannel status and call the interrupt handler
- * if status had been pending. Called with the console_subchannel lock.
+ * if status had been pending. Called with the subchannel's lock held.
*/
-static void cio_tsch(struct subchannel *sch)
+void cio_tsch(struct subchannel *sch)
{
struct irb *irb;
int irq_context;
@@ -690,22 +690,6 @@ void *cio_get_console_priv(void)
return &console_priv;
}
-/*
- * busy wait for the next interrupt on the console
- */
-void wait_cons_dev(void)
-{
- if (!console_subchannel_in_use)
- return;
-
- while (1) {
- cio_tsch(&console_subchannel);
- if (console_subchannel.schib.scsw.cmd.actl == 0)
- break;
- udelay_simple(100);
- }
-}
-
static int
cio_test_for_console(struct subchannel_id schid, void *data)
{
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 4a1ff5c..3b97c8b 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -133,6 +133,7 @@ extern int cio_is_console(struct subchannel_id);
extern struct subchannel *cio_get_console_subchannel(void);
extern spinlock_t * cio_get_console_lock(void);
extern void *cio_get_console_priv(void);
+extern void cio_tsch(struct subchannel *sch);
#else
#define cio_is_console(schid) 0
#define cio_get_console_subchannel() NULL
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index c6767f5..2e1e908 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -19,6 +19,7 @@
#include <linux/list.h>
#include <linux/device.h>
#include <linux/workqueue.h>
+#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/kernel_stat.h>
@@ -1612,13 +1613,15 @@ static int ccw_device_console_enable(struct ccw_device *cdev,
/* Now wait for the async. recognition to come to an end. */
spin_lock_irq(cdev->ccwlock);
while (!dev_fsm_final_state(cdev))
- wait_cons_dev();
+ ccw_device_wait_idle(cdev);
+
rc = -EIO;
if (cdev->private->state != DEV_STATE_OFFLINE)
goto out_unlock;
ccw_device_online(cdev);
while (!dev_fsm_final_state(cdev))
- wait_cons_dev();
+ ccw_device_wait_idle(cdev);
+
if (cdev->private->state != DEV_STATE_ONLINE)
goto out_unlock;
rc = 0;
@@ -1655,6 +1658,26 @@ ccw_device_probe_console(void)
return &console_cdev;
}
+/**
+ * ccw_device_wait_idle() - busy wait for device to become idle
+ * @cdev: ccw device
+ *
+ * Poll until activity control is zero, that is, no function or data
+ * transfer is pending/active.
+ * Called with device lock being held.
+ */
+void ccw_device_wait_idle(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
+ while (1) {
+ cio_tsch(sch);
+ if (sch->schib.scsw.cmd.actl == 0)
+ break;
+ udelay_simple(100);
+ }
+}
+
static int ccw_device_pm_restore(struct device *dev);
int ccw_device_force_console(void)
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