aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/blacklist.c35
-rw-r--r--drivers/s390/cio/css.c63
-rw-r--r--drivers/s390/cio/device.c4
-rw-r--r--drivers/s390/cio/device.h6
4 files changed, 72 insertions, 36 deletions
diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c
index 0960bef7b19..15b895496a4 100644
--- a/drivers/s390/cio/blacklist.c
+++ b/drivers/s390/cio/blacklist.c
@@ -224,39 +224,6 @@ is_blacklisted (int ssid, int devno)
}
#ifdef CONFIG_PROC_FS
-static int
-__s390_redo_validation(struct subchannel_id schid, void *data)
-{
- int ret;
- struct subchannel *sch;
-
- sch = get_subchannel_by_schid(schid);
- if (sch) {
- /* Already known. */
- put_device(&sch->dev);
- return 0;
- }
- ret = css_probe_device(schid);
- if (ret == -ENXIO)
- return ret; /* We're through. */
- if (ret == -ENOMEM)
- /* Stop validation for now. Bad, but no need for a panic. */
- return ret;
- return 0;
-}
-
-/*
- * Function: s390_redo_validation
- * Look for no longer blacklisted devices
- * FIXME: there must be a better way to do this */
-static inline void
-s390_redo_validation (void)
-{
- CIO_TRACE_EVENT (0, "redoval");
-
- for_each_subchannel(__s390_redo_validation, NULL);
-}
-
/*
* Function: blacklist_parse_proc_parameters
* parse the stuff which is piped to /proc/cio_ignore
@@ -281,7 +248,7 @@ blacklist_parse_proc_parameters (char *buf)
return;
}
- s390_redo_validation ();
+ css_schedule_reprobe();
}
/* Iterator struct for all devices. */
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 74ea8aac4b7..1d3be80797f 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -19,9 +19,11 @@
#include "cio_debug.h"
#include "ioasm.h"
#include "chsc.h"
+#include "device.h"
int need_rescan = 0;
int css_init_done = 0;
+static int need_reprobe = 0;
static int max_ssid = 0;
struct channel_subsystem *css[__MAX_CSSID + 1];
@@ -339,6 +341,67 @@ typedef void (*workfunc)(void *);
DECLARE_WORK(slow_path_work, (workfunc)css_trigger_slow_path, NULL);
struct workqueue_struct *slow_path_wq;
+/* Reprobe subchannel if unregistered. */
+static int reprobe_subchannel(struct subchannel_id schid, void *data)
+{
+ struct subchannel *sch;
+ int ret;
+
+ CIO_DEBUG(KERN_INFO, 6, "cio: reprobe 0.%x.%04x\n",
+ schid.ssid, schid.sch_no);
+ if (need_reprobe)
+ return -EAGAIN;
+
+ sch = get_subchannel_by_schid(schid);
+ if (sch) {
+ /* Already known. */
+ put_device(&sch->dev);
+ return 0;
+ }
+
+ ret = css_probe_device(schid);
+ switch (ret) {
+ case 0:
+ break;
+ case -ENXIO:
+ case -ENOMEM:
+ /* These should abort looping */
+ break;
+ default:
+ ret = 0;
+ }
+
+ return ret;
+}
+
+/* Work function used to reprobe all unregistered subchannels. */
+static void reprobe_all(void *data)
+{
+ int ret;
+
+ CIO_MSG_EVENT(2, "reprobe start\n");
+
+ need_reprobe = 0;
+ /* Make sure initial subchannel scan is done. */
+ wait_event(ccw_device_init_wq,
+ atomic_read(&ccw_device_init_count) == 0);
+ ret = for_each_subchannel(reprobe_subchannel, NULL);
+
+ CIO_MSG_EVENT(2, "reprobe done (rc=%d, need_reprobe=%d)\n", ret,
+ need_reprobe);
+}
+
+DECLARE_WORK(css_reprobe_work, reprobe_all, NULL);
+
+/* Schedule reprobing of all unregistered subchannels. */
+void css_schedule_reprobe(void)
+{
+ need_reprobe = 1;
+ queue_work(ccw_device_work, &css_reprobe_work);
+}
+
+EXPORT_SYMBOL_GPL(css_schedule_reprobe);
+
/*
* Rescan for new devices. FIXME: This is slow.
* This function is called when we have lost CRWs due to overflows and we have
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 8e3053c2a45..eafde43e841 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -133,8 +133,8 @@ struct css_driver io_subchannel_driver = {
struct workqueue_struct *ccw_device_work;
struct workqueue_struct *ccw_device_notify_work;
-static wait_queue_head_t ccw_device_init_wq;
-static atomic_t ccw_device_init_count;
+wait_queue_head_t ccw_device_init_wq;
+atomic_t ccw_device_init_count;
static int __init
init_ccw_bus_type (void)
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index 11587ebb728..8e0d1db3dd4 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -1,6 +1,10 @@
#ifndef S390_DEVICE_H
#define S390_DEVICE_H
+#include <asm/ccwdev.h>
+#include <asm/atomic.h>
+#include <linux/wait.h>
+
/*
* states of the device statemachine
*/
@@ -67,6 +71,8 @@ dev_fsm_final_state(struct ccw_device *cdev)
extern struct workqueue_struct *ccw_device_work;
extern struct workqueue_struct *ccw_device_notify_work;
+extern wait_queue_head_t ccw_device_init_wq;
+extern atomic_t ccw_device_init_count;
void io_subchannel_recog_done(struct ccw_device *cdev);