X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fs390%2Fchar%2Fmonreader.c;h=97e63cf469443ab594e231a288b856c0cc5d9562;hb=babdb788f7ec1a782a52240a5f6dae568f32565f;hp=a138b1510093cc53a6538a99c47fe020da53518a;hpb=96192ff1a9d0c6ef365d21667080259d83ea2f5b;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c index a138b15..97e63cf 100644 --- a/drivers/s390/char/monreader.c +++ b/drivers/s390/char/monreader.c @@ -3,14 +3,17 @@ * * Character device driver for reading z/VM *MONITOR service records. * - * Copyright (C) 2004 IBM Corporation, IBM Deutschland Entwicklung GmbH. - * - * Author: Gerald Schaefer + * Copyright IBM Corp. 2004, 2008 + * Author: Gerald Schaefer */ +#define KMSG_COMPONENT "monreader" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + #include #include #include +#include #include #include #include @@ -18,26 +21,12 @@ #include #include #include +#include +#include #include #include #include -#include -#include "../net/iucv.h" - - -//#define MON_DEBUG /* Debug messages on/off */ - -#define MON_NAME "monreader" -#define P_INFO(x...) printk(KERN_INFO MON_NAME " info: " x) -#define P_ERROR(x...) printk(KERN_ERR MON_NAME " error: " x) -#define P_WARNING(x...) printk(KERN_WARNING MON_NAME " warning: " x) - -#ifdef MON_DEBUG -#define P_DEBUG(x...) printk(KERN_DEBUG MON_NAME " debug: " x) -#else -#define P_DEBUG(x...) do {} while (0) -#endif #define MON_COLLECT_SAMPLE 0x80 #define MON_COLLECT_EVENT 0x40 @@ -50,14 +39,13 @@ static char mon_dcss_name[9] = "MONDCSS\0"; struct mon_msg { u32 pos; u32 mca_offset; - iucv_MessagePending local_eib; + struct iucv_message msg; char msglim_reached; char replied_msglim; }; struct mon_private { - u16 pathid; - iucv_handle_t iucv_handle; + struct iucv_path *path; struct mon_msg *msg_array[MON_MSGLIM]; unsigned int write_index; unsigned int read_index; @@ -75,8 +63,6 @@ static unsigned long mon_dcss_end; static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue); static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue); -static u8 iucv_host[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; - static u8 user_data_connect[16] = { /* Version code, must be 0x01 for shared mode */ 0x01, @@ -100,8 +86,7 @@ static u8 user_data_sever[16] = { * Create the 8 bytes EBCDIC DCSS segment name from * an ASCII name, incl. padding */ -static inline void -dcss_mkname(char *ascii_name, char *ebcdic_name) +static void dcss_mkname(char *ascii_name, char *ebcdic_name) { int i; @@ -115,95 +100,37 @@ dcss_mkname(char *ascii_name, char *ebcdic_name) ASCEBC(ebcdic_name, 8); } -/* - * print appropriate error message for segment_load()/segment_type() - * return code - */ -static void -mon_segment_warn(int rc, char* seg_name) +static inline unsigned long mon_mca_start(struct mon_msg *monmsg) { - switch (rc) { - case -ENOENT: - P_WARNING("cannot load/query segment %s, does not exist\n", - seg_name); - break; - case -ENOSYS: - P_WARNING("cannot load/query segment %s, not running on VM\n", - seg_name); - break; - case -EIO: - P_WARNING("cannot load/query segment %s, hardware error\n", - seg_name); - break; - case -ENOTSUPP: - P_WARNING("cannot load/query segment %s, is a multi-part " - "segment\n", seg_name); - break; - case -ENOSPC: - P_WARNING("cannot load/query segment %s, overlaps with " - "storage\n", seg_name); - break; - case -EBUSY: - P_WARNING("cannot load/query segment %s, overlaps with " - "already loaded dcss\n", seg_name); - break; - case -EPERM: - P_WARNING("cannot load/query segment %s, already loaded in " - "incompatible mode\n", seg_name); - break; - case -ENOMEM: - P_WARNING("cannot load/query segment %s, out of memory\n", - seg_name); - break; - case -ERANGE: - P_WARNING("cannot load/query segment %s, exceeds kernel " - "mapping range\n", seg_name); - break; - default: - P_WARNING("cannot load/query segment %s, return value %i\n", - seg_name, rc); - break; - } + return *(u32 *) &monmsg->msg.rmmsg; } -static inline unsigned long -mon_mca_start(struct mon_msg *monmsg) +static inline unsigned long mon_mca_end(struct mon_msg *monmsg) { - return monmsg->local_eib.ln1msg1.iprmmsg1_u32; + return *(u32 *) &monmsg->msg.rmmsg[4]; } -static inline unsigned long -mon_mca_end(struct mon_msg *monmsg) -{ - return monmsg->local_eib.ln1msg2.ipbfln1f; -} - -static inline u8 -mon_mca_type(struct mon_msg *monmsg, u8 index) +static inline u8 mon_mca_type(struct mon_msg *monmsg, u8 index) { return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index); } -static inline u32 -mon_mca_size(struct mon_msg *monmsg) +static inline u32 mon_mca_size(struct mon_msg *monmsg) { return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1; } -static inline u32 -mon_rec_start(struct mon_msg *monmsg) +static inline u32 mon_rec_start(struct mon_msg *monmsg) { return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4)); } -static inline u32 -mon_rec_end(struct mon_msg *monmsg) +static inline u32 mon_rec_end(struct mon_msg *monmsg) { return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8)); } -static inline int -mon_check_mca(struct mon_msg *monmsg) +static int mon_check_mca(struct mon_msg *monmsg) { if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) || (mon_rec_start(monmsg) < mon_dcss_start) || @@ -214,27 +141,17 @@ mon_check_mca(struct mon_msg *monmsg) (mon_mca_end(monmsg) > mon_dcss_end) || (mon_mca_start(monmsg) < mon_dcss_start) || ((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0))) - { - P_DEBUG("READ, IGNORED INVALID MCA\n\n"); return -EINVAL; - } return 0; } -static inline int -mon_send_reply(struct mon_msg *monmsg, struct mon_private *monpriv) +static int mon_send_reply(struct mon_msg *monmsg, + struct mon_private *monpriv) { - u8 prmmsg[8]; int rc; - P_DEBUG("read, REPLY: pathid = 0x%04X, msgid = 0x%08X, trgcls = " - "0x%08X\n\n", - monmsg->local_eib.ippathid, monmsg->local_eib.ipmsgid, - monmsg->local_eib.iptrgcls); - rc = iucv_reply_prmmsg(monmsg->local_eib.ippathid, - monmsg->local_eib.ipmsgid, - monmsg->local_eib.iptrgcls, - 0, prmmsg); + rc = iucv_message_reply(monpriv->path, &monmsg->msg, + IUCV_IPRMDATA, NULL, 0); atomic_dec(&monpriv->msglim_count); if (likely(!monmsg->msglim_reached)) { monmsg->pos = 0; @@ -245,79 +162,50 @@ mon_send_reply(struct mon_msg *monmsg, struct mon_private *monpriv) } else monmsg->replied_msglim = 1; if (rc) { - P_ERROR("read, IUCV reply failed with rc = %i\n\n", rc); + pr_err("Reading monitor data failed with rc=%i\n", rc); return -EIO; } return 0; } -static inline struct mon_private * -mon_alloc_mem(void) +static void mon_free_mem(struct mon_private *monpriv) { - int i,j; + int i; + + for (i = 0; i < MON_MSGLIM; i++) + if (monpriv->msg_array[i]) + kfree(monpriv->msg_array[i]); + kfree(monpriv); +} + +static struct mon_private *mon_alloc_mem(void) +{ + int i; struct mon_private *monpriv; monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); - if (!monpriv) { - P_ERROR("no memory for monpriv\n"); + if (!monpriv) return NULL; - } for (i = 0; i < MON_MSGLIM; i++) { monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg), GFP_KERNEL); if (!monpriv->msg_array[i]) { - P_ERROR("open, no memory for msg_array\n"); - for (j = 0; j < i; j++) - kfree(monpriv->msg_array[j]); + mon_free_mem(monpriv); return NULL; } } return monpriv; } -static inline void -mon_read_debug(struct mon_msg *monmsg, struct mon_private *monpriv) -{ -#ifdef MON_DEBUG - u8 msg_type[2], mca_type; - unsigned long records_len; - - records_len = mon_rec_end(monmsg) - mon_rec_start(monmsg) + 1; - - memcpy(msg_type, &monmsg->local_eib.iptrgcls, 2); - EBCASC(msg_type, 2); - mca_type = mon_mca_type(monmsg, 0); - EBCASC(&mca_type, 1); - - P_DEBUG("read, mon_read_index = %i, mon_write_index = %i\n", - monpriv->read_index, monpriv->write_index); - P_DEBUG("read, pathid = 0x%04X, msgid = 0x%08X, trgcls = 0x%08X\n", - monmsg->local_eib.ippathid, monmsg->local_eib.ipmsgid, - monmsg->local_eib.iptrgcls); - P_DEBUG("read, msg_type = '%c%c', mca_type = '%c' / 0x%X / 0x%X\n", - msg_type[0], msg_type[1], mca_type ? mca_type : 'X', - mon_mca_type(monmsg, 1), mon_mca_type(monmsg, 2)); - P_DEBUG("read, MCA: start = 0x%lX, end = 0x%lX\n", - mon_mca_start(monmsg), mon_mca_end(monmsg)); - P_DEBUG("read, REC: start = 0x%X, end = 0x%X, len = %lu\n\n", - mon_rec_start(monmsg), mon_rec_end(monmsg), records_len); - if (mon_mca_size(monmsg) > 12) - P_DEBUG("READ, MORE THAN ONE MCA\n\n"); -#endif -} - -static inline void -mon_next_mca(struct mon_msg *monmsg) +static inline void mon_next_mca(struct mon_msg *monmsg) { if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12)) return; - P_DEBUG("READ, NEXT MCA\n\n"); monmsg->mca_offset += 12; monmsg->pos = 0; } -static inline struct mon_msg * -mon_next_message(struct mon_private *monpriv) +static struct mon_msg *mon_next_message(struct mon_private *monpriv) { struct mon_msg *monmsg; @@ -329,7 +217,6 @@ mon_next_message(struct mon_private *monpriv) monmsg->msglim_reached = 0; monmsg->pos = 0; monmsg->mca_offset = 0; - P_WARNING("read, message limit reached\n"); monpriv->read_index = (monpriv->read_index + 1) % MON_MSGLIM; atomic_dec(&monpriv->read_ready); @@ -342,42 +229,35 @@ mon_next_message(struct mon_private *monpriv) /****************************************************************************** * IUCV handler * *****************************************************************************/ -static void -mon_iucv_ConnectionComplete(iucv_ConnectionComplete *eib, void *pgm_data) +static void mon_iucv_path_complete(struct iucv_path *path, u8 ipuser[16]) { - struct mon_private *monpriv = (struct mon_private *) pgm_data; + struct mon_private *monpriv = path->private; - P_DEBUG("IUCV connection completed\n"); - P_DEBUG("IUCV ACCEPT (from *MONITOR): Version = 0x%02X, Event = " - "0x%02X, Sample = 0x%02X\n", - eib->ipuser[0], eib->ipuser[1], eib->ipuser[2]); atomic_set(&monpriv->iucv_connected, 1); wake_up(&mon_conn_wait_queue); } -static void -mon_iucv_ConnectionSevered(iucv_ConnectionSevered *eib, void *pgm_data) +static void mon_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) { - struct mon_private *monpriv = (struct mon_private *) pgm_data; + struct mon_private *monpriv = path->private; - P_ERROR("IUCV connection severed with rc = 0x%X\n", - (u8) eib->ipuser[0]); + pr_err("z/VM *MONITOR system service disconnected with rc=%i\n", + ipuser[0]); + iucv_path_sever(path, NULL); atomic_set(&monpriv->iucv_severed, 1); wake_up(&mon_conn_wait_queue); wake_up_interruptible(&mon_read_wait_queue); } -static void -mon_iucv_MessagePending(iucv_MessagePending *eib, void *pgm_data) +static void mon_iucv_message_pending(struct iucv_path *path, + struct iucv_message *msg) { - struct mon_private *monpriv = (struct mon_private *) pgm_data; + struct mon_private *monpriv = path->private; - P_DEBUG("IUCV message pending\n"); - memcpy(&monpriv->msg_array[monpriv->write_index]->local_eib, eib, - sizeof(iucv_MessagePending)); + memcpy(&monpriv->msg_array[monpriv->write_index]->msg, + msg, sizeof(*msg)); if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) { - P_WARNING("IUCV message pending, message limit (%i) reached\n", - MON_MSGLIM); + pr_warning("The read queue for monitor data is full\n"); monpriv->msg_array[monpriv->write_index]->msglim_reached = 1; } monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM; @@ -385,54 +265,46 @@ mon_iucv_MessagePending(iucv_MessagePending *eib, void *pgm_data) wake_up_interruptible(&mon_read_wait_queue); } -static iucv_interrupt_ops_t mon_iucvops = { - .ConnectionComplete = mon_iucv_ConnectionComplete, - .ConnectionSevered = mon_iucv_ConnectionSevered, - .MessagePending = mon_iucv_MessagePending, +static struct iucv_handler monreader_iucv_handler = { + .path_complete = mon_iucv_path_complete, + .path_severed = mon_iucv_path_severed, + .message_pending = mon_iucv_message_pending, }; /****************************************************************************** * file operations * *****************************************************************************/ -static int -mon_open(struct inode *inode, struct file *filp) +static int mon_open(struct inode *inode, struct file *filp) { - int rc, i; struct mon_private *monpriv; + int rc; /* * only one user allowed */ + lock_kernel(); + rc = -EBUSY; if (test_and_set_bit(MON_IN_USE, &mon_in_use)) - return -EBUSY; + goto out; + rc = -ENOMEM; monpriv = mon_alloc_mem(); if (!monpriv) - return -ENOMEM; + goto out_use; /* - * Register with IUCV and connect to *MONITOR service + * Connect to *MONITOR service */ - monpriv->iucv_handle = iucv_register_program("my_monreader ", - MON_SERVICE, - NULL, - &mon_iucvops, - monpriv); - if (!monpriv->iucv_handle) { - P_ERROR("failed to register with iucv driver\n"); - rc = -EIO; - goto out_error; - } - P_INFO("open, registered with IUCV\n"); - - rc = iucv_connect(&monpriv->pathid, MON_MSGLIM, user_data_connect, - MON_SERVICE, iucv_host, IPRMDATA, NULL, NULL, - monpriv->iucv_handle, NULL); + monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); + if (!monpriv->path) + goto out_priv; + rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, + MON_SERVICE, NULL, user_data_connect, monpriv); if (rc) { - P_ERROR("iucv connection to *MONITOR failed with " - "IPUSER SEVER code = %i\n", rc); + pr_err("Connecting to the z/VM *MONITOR system service " + "failed with rc=%i\n", rc); rc = -EIO; - goto out_unregister; + goto out_path; } /* * Wait for connection confirmation @@ -444,24 +316,24 @@ mon_open(struct inode *inode, struct file *filp) atomic_set(&monpriv->iucv_severed, 0); atomic_set(&monpriv->iucv_connected, 0); rc = -EIO; - goto out_unregister; + goto out_path; } - P_INFO("open, established connection to *MONITOR service\n\n"); filp->private_data = monpriv; + unlock_kernel(); return nonseekable_open(inode, filp); -out_unregister: - iucv_unregister_program(monpriv->iucv_handle); -out_error: - for (i = 0; i < MON_MSGLIM; i++) - kfree(monpriv->msg_array[i]); - kfree(monpriv); +out_path: + kfree(monpriv->path); +out_priv: + mon_free_mem(monpriv); +out_use: clear_bit(MON_IN_USE, &mon_in_use); +out: + unlock_kernel(); return rc; } -static int -mon_close(struct inode *inode, struct file *filp) +static int mon_close(struct inode *inode, struct file *filp) { int rc, i; struct mon_private *monpriv = filp->private_data; @@ -469,17 +341,10 @@ mon_close(struct inode *inode, struct file *filp) /* * Close IUCV connection and unregister */ - rc = iucv_sever(monpriv->pathid, user_data_sever); + rc = iucv_path_sever(monpriv->path, user_data_sever); if (rc) - P_ERROR("close, iucv_sever failed with rc = %i\n", rc); - else - P_INFO("close, terminated connection to *MONITOR service\n"); - - rc = iucv_unregister_program(monpriv->iucv_handle); - if (rc) - P_ERROR("close, iucv_unregister failed with rc = %i\n", rc); - else - P_INFO("close, unregistered with IUCV\n"); + pr_warning("Disconnecting the z/VM *MONITOR system service " + "failed with rc=%i\n", rc); atomic_set(&monpriv->iucv_severed, 0); atomic_set(&monpriv->iucv_connected, 0); @@ -495,8 +360,8 @@ mon_close(struct inode *inode, struct file *filp) return 0; } -static ssize_t -mon_read(struct file *filp, char __user *data, size_t count, loff_t *ppos) +static ssize_t mon_read(struct file *filp, char __user *data, + size_t count, loff_t *ppos) { struct mon_private *monpriv = filp->private_data; struct mon_msg *monmsg; @@ -520,10 +385,8 @@ mon_read(struct file *filp, char __user *data, size_t count, loff_t *ppos) monmsg = monpriv->msg_array[monpriv->read_index]; } - if (!monmsg->pos) { + if (!monmsg->pos) monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset; - mon_read_debug(monmsg, monpriv); - } if (mon_check_mca(monmsg)) goto reply; @@ -563,8 +426,7 @@ out_copy: return count; } -static unsigned int -mon_poll(struct file *filp, struct poll_table_struct *p) +static unsigned int mon_poll(struct file *filp, struct poll_table_struct *p) { struct mon_private *monpriv = filp->private_data; @@ -576,7 +438,7 @@ mon_poll(struct file *filp, struct poll_table_struct *p) return 0; } -static struct file_operations mon_fops = { +static const struct file_operations mon_fops = { .owner = THIS_MODULE, .open = &mon_open, .release = &mon_close, @@ -593,55 +455,64 @@ static struct miscdevice mon_dev = { /****************************************************************************** * module init/exit * *****************************************************************************/ -static int __init -mon_init(void) +static int __init mon_init(void) { int rc; if (!MACHINE_IS_VM) { - P_ERROR("not running under z/VM, driver not loaded\n"); + pr_err("The z/VM *MONITOR record device driver cannot be " + "loaded without z/VM\n"); return -ENODEV; } + /* + * Register with IUCV and connect to *MONITOR service + */ + rc = iucv_register(&monreader_iucv_handler, 1); + if (rc) { + pr_err("The z/VM *MONITOR record device driver failed to " + "register with IUCV\n"); + return rc; + } + rc = segment_type(mon_dcss_name); if (rc < 0) { - mon_segment_warn(rc, mon_dcss_name); - return rc; + segment_warning(rc, mon_dcss_name); + goto out_iucv; } if (rc != SEG_TYPE_SC) { - P_ERROR("segment %s has unsupported type, should be SC\n", - mon_dcss_name); - return -EINVAL; + pr_err("The specified *MONITOR DCSS %s does not have the " + "required type SC\n", mon_dcss_name); + rc = -EINVAL; + goto out_iucv; } rc = segment_load(mon_dcss_name, SEGMENT_SHARED, &mon_dcss_start, &mon_dcss_end); if (rc < 0) { - mon_segment_warn(rc, mon_dcss_name); - return -EINVAL; + segment_warning(rc, mon_dcss_name); + rc = -EINVAL; + goto out_iucv; } dcss_mkname(mon_dcss_name, &user_data_connect[8]); rc = misc_register(&mon_dev); - if (rc < 0 ) { - P_ERROR("misc_register failed, rc = %i\n", rc); + if (rc < 0 ) goto out; - } - P_INFO("Loaded segment %s from %p to %p, size = %lu Byte\n", - mon_dcss_name, (void *) mon_dcss_start, (void *) mon_dcss_end, - mon_dcss_end - mon_dcss_start + 1); return 0; out: segment_unload(mon_dcss_name); +out_iucv: + iucv_unregister(&monreader_iucv_handler, 1); return rc; } -static void __exit -mon_exit(void) +static void __exit mon_exit(void) { segment_unload(mon_dcss_name); WARN_ON(misc_deregister(&mon_dev) != 0); + iucv_unregister(&monreader_iucv_handler, 1); return; }