diff options
| -rw-r--r-- | drivers/s390/cio/blacklist.c | 35 | ||||
| -rw-r--r-- | drivers/s390/cio/css.c | 63 | ||||
| -rw-r--r-- | drivers/s390/cio/device.c | 4 | ||||
| -rw-r--r-- | drivers/s390/cio/device.h | 6 | ||||
| -rw-r--r-- | include/asm-s390/cio.h | 2 |
5 files changed, 74 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); diff --git a/include/asm-s390/cio.h b/include/asm-s390/cio.h index 089cf567c31..2b161930635 100644 --- a/include/asm-s390/cio.h +++ b/include/asm-s390/cio.h @@ -276,6 +276,8 @@ extern void wait_cons_dev(void); extern void clear_all_subchannels(void); +extern void css_schedule_reprobe(void); + #endif #endif |