![Peter Senna Tschudin](/assets/img/avatar_default.png)
Convert a nonnegative error return code to a negative one, as returned elsewhere in the function. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> ( if@p1 (\(ret < 0\|ret != 0\)) { ... return ret; } | ret@p1 = 0 ) ... when != ret = e1 when != &ret *if(...) { ... when != ret = e2 when forall return ret; } // </smpl> Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
653 lines
16 KiB
C
653 lines
16 KiB
C
/*
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* Character device driver for reading z/VM *MONITOR service records.
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*
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* Copyright IBM Corp. 2004, 2009
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*
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* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#define KMSG_COMPONENT "monreader"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/ctype.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <net/iucv/iucv.h>
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#include <asm/uaccess.h>
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#include <asm/ebcdic.h>
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#include <asm/extmem.h>
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#define MON_COLLECT_SAMPLE 0x80
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#define MON_COLLECT_EVENT 0x40
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#define MON_SERVICE "*MONITOR"
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#define MON_IN_USE 0x01
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#define MON_MSGLIM 255
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static char mon_dcss_name[9] = "MONDCSS\0";
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struct mon_msg {
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u32 pos;
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u32 mca_offset;
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struct iucv_message msg;
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char msglim_reached;
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char replied_msglim;
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};
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struct mon_private {
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struct iucv_path *path;
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struct mon_msg *msg_array[MON_MSGLIM];
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unsigned int write_index;
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unsigned int read_index;
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atomic_t msglim_count;
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atomic_t read_ready;
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atomic_t iucv_connected;
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atomic_t iucv_severed;
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};
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static unsigned long mon_in_use = 0;
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static unsigned long mon_dcss_start;
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static unsigned long mon_dcss_end;
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static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue);
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static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue);
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static u8 user_data_connect[16] = {
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/* Version code, must be 0x01 for shared mode */
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0x01,
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/* what to collect */
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MON_COLLECT_SAMPLE | MON_COLLECT_EVENT,
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/* DCSS name in EBCDIC, 8 bytes padded with blanks */
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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static u8 user_data_sever[16] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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static struct device *monreader_device;
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/******************************************************************************
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* helper functions *
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*****************************************************************************/
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/*
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* Create the 8 bytes EBCDIC DCSS segment name from
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* an ASCII name, incl. padding
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*/
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static void dcss_mkname(char *ascii_name, char *ebcdic_name)
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{
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int i;
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for (i = 0; i < 8; i++) {
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if (ascii_name[i] == '\0')
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break;
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ebcdic_name[i] = toupper(ascii_name[i]);
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};
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for (; i < 8; i++)
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ebcdic_name[i] = ' ';
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ASCEBC(ebcdic_name, 8);
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}
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static inline unsigned long mon_mca_start(struct mon_msg *monmsg)
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{
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return *(u32 *) &monmsg->msg.rmmsg;
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}
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static inline unsigned long mon_mca_end(struct mon_msg *monmsg)
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{
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return *(u32 *) &monmsg->msg.rmmsg[4];
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}
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static inline u8 mon_mca_type(struct mon_msg *monmsg, u8 index)
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{
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return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index);
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}
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static inline u32 mon_mca_size(struct mon_msg *monmsg)
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{
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return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1;
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}
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static inline u32 mon_rec_start(struct mon_msg *monmsg)
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{
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return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4));
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}
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static inline u32 mon_rec_end(struct mon_msg *monmsg)
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{
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return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8));
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}
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static int mon_check_mca(struct mon_msg *monmsg)
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{
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if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) ||
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(mon_rec_start(monmsg) < mon_dcss_start) ||
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(mon_rec_end(monmsg) > mon_dcss_end) ||
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(mon_mca_type(monmsg, 0) == 0) ||
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(mon_mca_size(monmsg) % 12 != 0) ||
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(mon_mca_end(monmsg) <= mon_mca_start(monmsg)) ||
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(mon_mca_end(monmsg) > mon_dcss_end) ||
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(mon_mca_start(monmsg) < mon_dcss_start) ||
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((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0)))
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return -EINVAL;
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return 0;
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}
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static int mon_send_reply(struct mon_msg *monmsg,
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struct mon_private *monpriv)
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{
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int rc;
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rc = iucv_message_reply(monpriv->path, &monmsg->msg,
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IUCV_IPRMDATA, NULL, 0);
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atomic_dec(&monpriv->msglim_count);
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if (likely(!monmsg->msglim_reached)) {
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monmsg->pos = 0;
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monmsg->mca_offset = 0;
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monpriv->read_index = (monpriv->read_index + 1) %
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MON_MSGLIM;
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atomic_dec(&monpriv->read_ready);
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} else
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monmsg->replied_msglim = 1;
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if (rc) {
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pr_err("Reading monitor data failed with rc=%i\n", rc);
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return -EIO;
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}
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return 0;
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}
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static void mon_free_mem(struct mon_private *monpriv)
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{
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int i;
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for (i = 0; i < MON_MSGLIM; i++)
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if (monpriv->msg_array[i])
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kfree(monpriv->msg_array[i]);
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kfree(monpriv);
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}
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static struct mon_private *mon_alloc_mem(void)
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{
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int i;
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struct mon_private *monpriv;
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monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL);
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if (!monpriv)
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return NULL;
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for (i = 0; i < MON_MSGLIM; i++) {
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monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg),
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GFP_KERNEL);
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if (!monpriv->msg_array[i]) {
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mon_free_mem(monpriv);
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return NULL;
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}
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}
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return monpriv;
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}
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static inline void mon_next_mca(struct mon_msg *monmsg)
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{
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if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12))
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return;
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monmsg->mca_offset += 12;
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monmsg->pos = 0;
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}
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static struct mon_msg *mon_next_message(struct mon_private *monpriv)
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{
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struct mon_msg *monmsg;
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if (!atomic_read(&monpriv->read_ready))
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return NULL;
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monmsg = monpriv->msg_array[monpriv->read_index];
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if (unlikely(monmsg->replied_msglim)) {
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monmsg->replied_msglim = 0;
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monmsg->msglim_reached = 0;
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monmsg->pos = 0;
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monmsg->mca_offset = 0;
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monpriv->read_index = (monpriv->read_index + 1) %
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MON_MSGLIM;
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atomic_dec(&monpriv->read_ready);
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return ERR_PTR(-EOVERFLOW);
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}
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return monmsg;
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}
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/******************************************************************************
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* IUCV handler *
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*****************************************************************************/
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static void mon_iucv_path_complete(struct iucv_path *path, u8 ipuser[16])
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{
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struct mon_private *monpriv = path->private;
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atomic_set(&monpriv->iucv_connected, 1);
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wake_up(&mon_conn_wait_queue);
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}
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static void mon_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
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{
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struct mon_private *monpriv = path->private;
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pr_err("z/VM *MONITOR system service disconnected with rc=%i\n",
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ipuser[0]);
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iucv_path_sever(path, NULL);
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atomic_set(&monpriv->iucv_severed, 1);
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wake_up(&mon_conn_wait_queue);
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wake_up_interruptible(&mon_read_wait_queue);
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}
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static void mon_iucv_message_pending(struct iucv_path *path,
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struct iucv_message *msg)
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{
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struct mon_private *monpriv = path->private;
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memcpy(&monpriv->msg_array[monpriv->write_index]->msg,
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msg, sizeof(*msg));
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if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) {
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pr_warning("The read queue for monitor data is full\n");
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monpriv->msg_array[monpriv->write_index]->msglim_reached = 1;
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}
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monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM;
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atomic_inc(&monpriv->read_ready);
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wake_up_interruptible(&mon_read_wait_queue);
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}
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static struct iucv_handler monreader_iucv_handler = {
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.path_complete = mon_iucv_path_complete,
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.path_severed = mon_iucv_path_severed,
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.message_pending = mon_iucv_message_pending,
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};
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/******************************************************************************
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* file operations *
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*****************************************************************************/
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static int mon_open(struct inode *inode, struct file *filp)
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{
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struct mon_private *monpriv;
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int rc;
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/*
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* only one user allowed
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*/
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rc = -EBUSY;
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if (test_and_set_bit(MON_IN_USE, &mon_in_use))
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goto out;
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rc = -ENOMEM;
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monpriv = mon_alloc_mem();
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if (!monpriv)
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goto out_use;
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/*
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* Connect to *MONITOR service
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*/
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monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL);
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if (!monpriv->path)
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goto out_priv;
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rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler,
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MON_SERVICE, NULL, user_data_connect, monpriv);
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if (rc) {
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pr_err("Connecting to the z/VM *MONITOR system service "
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"failed with rc=%i\n", rc);
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rc = -EIO;
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goto out_path;
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}
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/*
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* Wait for connection confirmation
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*/
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wait_event(mon_conn_wait_queue,
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atomic_read(&monpriv->iucv_connected) ||
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atomic_read(&monpriv->iucv_severed));
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if (atomic_read(&monpriv->iucv_severed)) {
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atomic_set(&monpriv->iucv_severed, 0);
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atomic_set(&monpriv->iucv_connected, 0);
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rc = -EIO;
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goto out_path;
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}
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filp->private_data = monpriv;
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dev_set_drvdata(monreader_device, monpriv);
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return nonseekable_open(inode, filp);
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out_path:
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iucv_path_free(monpriv->path);
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out_priv:
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mon_free_mem(monpriv);
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out_use:
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clear_bit(MON_IN_USE, &mon_in_use);
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out:
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return rc;
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}
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static int mon_close(struct inode *inode, struct file *filp)
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{
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int rc, i;
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struct mon_private *monpriv = filp->private_data;
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/*
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* Close IUCV connection and unregister
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*/
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if (monpriv->path) {
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rc = iucv_path_sever(monpriv->path, user_data_sever);
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if (rc)
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pr_warning("Disconnecting the z/VM *MONITOR system "
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"service failed with rc=%i\n", rc);
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iucv_path_free(monpriv->path);
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}
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atomic_set(&monpriv->iucv_severed, 0);
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atomic_set(&monpriv->iucv_connected, 0);
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atomic_set(&monpriv->read_ready, 0);
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atomic_set(&monpriv->msglim_count, 0);
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monpriv->write_index = 0;
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monpriv->read_index = 0;
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dev_set_drvdata(monreader_device, NULL);
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for (i = 0; i < MON_MSGLIM; i++)
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kfree(monpriv->msg_array[i]);
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kfree(monpriv);
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clear_bit(MON_IN_USE, &mon_in_use);
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return 0;
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}
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static ssize_t mon_read(struct file *filp, char __user *data,
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size_t count, loff_t *ppos)
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{
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struct mon_private *monpriv = filp->private_data;
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struct mon_msg *monmsg;
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int ret;
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u32 mce_start;
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monmsg = mon_next_message(monpriv);
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if (IS_ERR(monmsg))
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return PTR_ERR(monmsg);
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if (!monmsg) {
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if (filp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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ret = wait_event_interruptible(mon_read_wait_queue,
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atomic_read(&monpriv->read_ready) ||
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atomic_read(&monpriv->iucv_severed));
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if (ret)
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return ret;
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if (unlikely(atomic_read(&monpriv->iucv_severed)))
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return -EIO;
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monmsg = monpriv->msg_array[monpriv->read_index];
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}
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if (!monmsg->pos)
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monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset;
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if (mon_check_mca(monmsg))
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goto reply;
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/* read monitor control element (12 bytes) first */
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mce_start = mon_mca_start(monmsg) + monmsg->mca_offset;
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if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) {
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count = min(count, (size_t) mce_start + 12 - monmsg->pos);
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ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos,
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count);
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if (ret)
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return -EFAULT;
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monmsg->pos += count;
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if (monmsg->pos == mce_start + 12)
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monmsg->pos = mon_rec_start(monmsg);
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goto out_copy;
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}
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/* read records */
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if (monmsg->pos <= mon_rec_end(monmsg)) {
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count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos
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+ 1);
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ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos,
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count);
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if (ret)
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return -EFAULT;
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monmsg->pos += count;
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if (monmsg->pos > mon_rec_end(monmsg))
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mon_next_mca(monmsg);
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goto out_copy;
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}
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reply:
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ret = mon_send_reply(monmsg, monpriv);
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return ret;
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out_copy:
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*ppos += count;
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return count;
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}
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static unsigned int mon_poll(struct file *filp, struct poll_table_struct *p)
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{
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struct mon_private *monpriv = filp->private_data;
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poll_wait(filp, &mon_read_wait_queue, p);
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if (unlikely(atomic_read(&monpriv->iucv_severed)))
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return POLLERR;
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if (atomic_read(&monpriv->read_ready))
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return POLLIN | POLLRDNORM;
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return 0;
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}
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static const struct file_operations mon_fops = {
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.owner = THIS_MODULE,
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.open = &mon_open,
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.release = &mon_close,
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.read = &mon_read,
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.poll = &mon_poll,
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.llseek = noop_llseek,
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};
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static struct miscdevice mon_dev = {
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.name = "monreader",
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.fops = &mon_fops,
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.minor = MISC_DYNAMIC_MINOR,
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};
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/******************************************************************************
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* suspend / resume *
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*****************************************************************************/
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static int monreader_freeze(struct device *dev)
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{
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struct mon_private *monpriv = dev_get_drvdata(dev);
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int rc;
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if (!monpriv)
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return 0;
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if (monpriv->path) {
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rc = iucv_path_sever(monpriv->path, user_data_sever);
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if (rc)
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pr_warning("Disconnecting the z/VM *MONITOR system "
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"service failed with rc=%i\n", rc);
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iucv_path_free(monpriv->path);
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}
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atomic_set(&monpriv->iucv_severed, 0);
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atomic_set(&monpriv->iucv_connected, 0);
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atomic_set(&monpriv->read_ready, 0);
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atomic_set(&monpriv->msglim_count, 0);
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monpriv->write_index = 0;
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monpriv->read_index = 0;
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monpriv->path = NULL;
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return 0;
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}
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static int monreader_thaw(struct device *dev)
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{
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struct mon_private *monpriv = dev_get_drvdata(dev);
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int rc;
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if (!monpriv)
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return 0;
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rc = -ENOMEM;
|
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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 const 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 *
|
|
*****************************************************************************/
|
|
static int __init mon_init(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!MACHINE_IS_VM) {
|
|
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 = driver_register(&monreader_driver);
|
|
if (rc)
|
|
goto out_iucv;
|
|
monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
if (!monreader_device) {
|
|
rc = -ENOMEM;
|
|
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) {
|
|
put_device(monreader_device);
|
|
goto out_driver;
|
|
}
|
|
|
|
rc = segment_type(mon_dcss_name);
|
|
if (rc < 0) {
|
|
segment_warning(rc, mon_dcss_name);
|
|
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_device;
|
|
}
|
|
|
|
rc = segment_load(mon_dcss_name, SEGMENT_SHARED,
|
|
&mon_dcss_start, &mon_dcss_end);
|
|
if (rc < 0) {
|
|
segment_warning(rc, mon_dcss_name);
|
|
rc = -EINVAL;
|
|
goto out_device;
|
|
}
|
|
dcss_mkname(mon_dcss_name, &user_data_connect[8]);
|
|
|
|
/*
|
|
* misc_register() has to be the last action in module_init(), because
|
|
* file operations will be available right after this.
|
|
*/
|
|
rc = misc_register(&mon_dev);
|
|
if (rc < 0 )
|
|
goto out;
|
|
return 0;
|
|
|
|
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;
|
|
}
|
|
|
|
static void __exit mon_exit(void)
|
|
{
|
|
segment_unload(mon_dcss_name);
|
|
misc_deregister(&mon_dev);
|
|
device_unregister(monreader_device);
|
|
driver_unregister(&monreader_driver);
|
|
iucv_unregister(&monreader_iucv_handler, 1);
|
|
return;
|
|
}
|
|
|
|
|
|
module_init(mon_init);
|
|
module_exit(mon_exit);
|
|
|
|
module_param_string(mondcss, mon_dcss_name, 9, 0444);
|
|
MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR "
|
|
"service, max. 8 chars. Default is MONDCSS");
|
|
|
|
MODULE_AUTHOR("Gerald Schaefer <geraldsc@de.ibm.com>");
|
|
MODULE_DESCRIPTION("Character device driver for reading z/VM "
|
|
"monitor service records.");
|
|
MODULE_LICENSE("GPL");
|