*
* Character device driver for reading z/VM *MONITOR service records.
*
- * Copyright 2004 IBM Corporation, IBM Deutschland Entwicklung GmbH.
- *
- * Author: Gerald Schaefer <geraldsc@de.ibm.com>
+ * Copyright IBM Corp. 2004, 2008
+ * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
*/
+#define KMSG_COMPONENT "monreader"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
+#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <net/iucv/iucv.h>
#include <asm/uaccess.h>
#include <asm/ebcdic.h>
#include <asm/extmem.h>
-#include <linux/poll.h>
-#include <net/iucv/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
(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;
}
{
int rc;
- P_DEBUG("read, REPLY: pathid = 0x%04X, msgid = 0x%08X, trgcls = "
- "0x%08X\n\n",
- monpriv->path->pathid, monmsg->msg.id, monmsg->msg.class);
-
rc = iucv_message_reply(monpriv->path, &monmsg->msg,
IUCV_IPRMDATA, NULL, 0);
atomic_dec(&monpriv->msglim_count);
} 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;
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");
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->msg.class, 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",
- monpriv->path->pathid, monmsg->msg.id, monmsg->msg.class);
- 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)
{
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;
}
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);
{
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",
- ipuser[0], ipuser[1], ipuser[2]);
atomic_set(&monpriv->iucv_connected, 1);
wake_up(&mon_conn_wait_queue);
}
{
struct mon_private *monpriv = path->private;
- P_ERROR("IUCV connection severed with rc = 0x%X\n", 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);
{
struct mon_private *monpriv = path->private;
- P_DEBUG("IUCV message pending\n");
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;
/*
* only one user allowed
*/
+ lock_kernel();
rc = -EBUSY;
if (test_and_set_bit(MON_IN_USE, &mon_in_use))
goto out;
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_path;
}
rc = -EIO;
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_path:
out_use:
clear_bit(MON_IN_USE, &mon_in_use);
out:
+ unlock_kernel();
return rc;
}
*/
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");
+ 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);
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;
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;
}
*/
rc = iucv_register(&monreader_iucv_handler, 1);
if (rc) {
- P_ERROR("failed to register with iucv driver\n");
+ pr_err("The z/VM *MONITOR record device driver failed to "
+ "register with IUCV\n");
return rc;
}
- P_INFO("open, registered with IUCV\n");
rc = segment_type(mon_dcss_name);
if (rc < 0) {
goto out_iucv;
}
if (rc != SEG_TYPE_SC) {
- P_ERROR("segment %s has unsupported type, should be SC\n",
- mon_dcss_name);
+ pr_err("The specified *MONITOR DCSS %s does not have the "
+ "required type SC\n", 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:
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff