diff options
| -rw-r--r-- | drivers/s390/char/monreader.c | 140 |
1 files changed, 128 insertions, 12 deletions
diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c index 97e63cf4694..75a8831eebb 100644 --- a/drivers/s390/char/monreader.c +++ b/drivers/s390/char/monreader.c @@ -1,10 +1,9 @@ /* - * drivers/s390/char/monreader.c - * * Character device driver for reading z/VM *MONITOR service records. * - * Copyright IBM Corp. 2004, 2008 - * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> + * Copyright IBM Corp. 2004, 2009 + * + * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> */ #define KMSG_COMPONENT "monreader" @@ -22,6 +21,7 @@ #include <linux/spinlock.h> #include <linux/interrupt.h> #include <linux/poll.h> +#include <linux/device.h> #include <net/iucv/iucv.h> #include <asm/uaccess.h> #include <asm/ebcdic.h> @@ -78,6 +78,7 @@ static u8 user_data_sever[16] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }; +static struct device *monreader_device; /****************************************************************************** * helper functions * @@ -319,11 +320,12 @@ static int mon_open(struct inode *inode, struct file *filp) goto out_path; } filp->private_data = monpriv; + monreader_device->driver_data = monpriv; unlock_kernel(); return nonseekable_open(inode, filp); out_path: - kfree(monpriv->path); + iucv_path_free(monpriv->path); out_priv: mon_free_mem(monpriv); out_use: @@ -341,10 +343,13 @@ static int mon_close(struct inode *inode, struct file *filp) /* * Close IUCV connection and unregister */ - rc = iucv_path_sever(monpriv->path, user_data_sever); - if (rc) - pr_warning("Disconnecting the z/VM *MONITOR system service " - "failed with rc=%i\n", rc); + if (monpriv->path) { + rc = iucv_path_sever(monpriv->path, user_data_sever); + if (rc) + pr_warning("Disconnecting the z/VM *MONITOR system " + "service failed with rc=%i\n", rc); + iucv_path_free(monpriv->path); + } atomic_set(&monpriv->iucv_severed, 0); atomic_set(&monpriv->iucv_connected, 0); @@ -452,6 +457,94 @@ static struct miscdevice mon_dev = { .minor = MISC_DYNAMIC_MINOR, }; + +/****************************************************************************** + * suspend / resume * + *****************************************************************************/ +static int monreader_freeze(struct device *dev) +{ + struct mon_private *monpriv = dev->driver_data; + int rc; + + if (!monpriv) + return 0; + if (monpriv->path) { + rc = iucv_path_sever(monpriv->path, user_data_sever); + if (rc) + pr_warning("Disconnecting the z/VM *MONITOR system " + "service failed with rc=%i\n", rc); + iucv_path_free(monpriv->path); + } + atomic_set(&monpriv->iucv_severed, 0); + atomic_set(&monpriv->iucv_connected, 0); + atomic_set(&monpriv->read_ready, 0); + atomic_set(&monpriv->msglim_count, 0); + monpriv->write_index = 0; + monpriv->read_index = 0; + monpriv->path = NULL; + return 0; +} + +static int monreader_thaw(struct device *dev) +{ + struct mon_private *monpriv = dev->driver_data; + int rc; + + if (!monpriv) + return 0; + rc = -ENOMEM; + monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); + if (!monpriv->path) + goto out; + rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, + MON_SERVICE, NULL, user_data_connect, monpriv); + if (rc) { + pr_err("Connecting to the z/VM *MONITOR system service " + "failed with rc=%i\n", rc); + goto out_path; + } + wait_event(mon_conn_wait_queue, + atomic_read(&monpriv->iucv_connected) || + atomic_read(&monpriv->iucv_severed)); + if (atomic_read(&monpriv->iucv_severed)) + goto out_path; + return 0; +out_path: + rc = -EIO; + iucv_path_free(monpriv->path); + monpriv->path = NULL; +out: + atomic_set(&monpriv->iucv_severed, 1); + return rc; +} + +static int monreader_restore(struct device *dev) +{ + int rc; + + segment_unload(mon_dcss_name); + rc = segment_load(mon_dcss_name, SEGMENT_SHARED, + &mon_dcss_start, &mon_dcss_end); + if (rc < 0) { + segment_warning(rc, mon_dcss_name); + panic("fatal monreader resume error: no monitor dcss\n"); + } + return monreader_thaw(dev); +} + +static struct dev_pm_ops monreader_pm_ops = { + .freeze = monreader_freeze, + .thaw = monreader_thaw, + .restore = monreader_restore, +}; + +static struct device_driver monreader_driver = { + .name = "monreader", + .bus = &iucv_bus, + .pm = &monreader_pm_ops, +}; + + /****************************************************************************** * module init/exit * *****************************************************************************/ @@ -475,16 +568,33 @@ static int __init mon_init(void) return rc; } + rc = driver_register(&monreader_driver); + if (rc) + goto out_iucv; + monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!monreader_device) + goto out_driver; + dev_set_name(monreader_device, "monreader-dev"); + monreader_device->bus = &iucv_bus; + monreader_device->parent = iucv_root; + monreader_device->driver = &monreader_driver; + monreader_device->release = (void (*)(struct device *))kfree; + rc = device_register(monreader_device); + if (rc) { + kfree(monreader_device); + goto out_driver; + } + rc = segment_type(mon_dcss_name); if (rc < 0) { segment_warning(rc, mon_dcss_name); - goto out_iucv; + goto out_device; } if (rc != SEG_TYPE_SC) { pr_err("The specified *MONITOR DCSS %s does not have the " "required type SC\n", mon_dcss_name); rc = -EINVAL; - goto out_iucv; + goto out_device; } rc = segment_load(mon_dcss_name, SEGMENT_SHARED, @@ -492,7 +602,7 @@ static int __init mon_init(void) if (rc < 0) { segment_warning(rc, mon_dcss_name); rc = -EINVAL; - goto out_iucv; + goto out_device; } dcss_mkname(mon_dcss_name, &user_data_connect[8]); @@ -503,6 +613,10 @@ static int __init mon_init(void) out: segment_unload(mon_dcss_name); +out_device: + device_unregister(monreader_device); +out_driver: + driver_unregister(&monreader_driver); out_iucv: iucv_unregister(&monreader_iucv_handler, 1); return rc; @@ -512,6 +626,8 @@ static void __exit mon_exit(void) { segment_unload(mon_dcss_name); WARN_ON(misc_deregister(&mon_dev) != 0); + device_unregister(monreader_device); + driver_unregister(&monreader_driver); iucv_unregister(&monreader_iucv_handler, 1); return; } |