^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Character device driver for reading z/VM *MONITOR service records.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2004, 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define KMSG_COMPONENT "monreader"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <net/iucv/iucv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/ebcdic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/extmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define MON_COLLECT_SAMPLE 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define MON_COLLECT_EVENT 0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define MON_SERVICE "*MONITOR"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define MON_IN_USE 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define MON_MSGLIM 255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static char mon_dcss_name[9] = "MONDCSS\0";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct mon_msg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) u32 pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) u32 mca_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct iucv_message msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) char msglim_reached;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) char replied_msglim;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct mon_private {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct iucv_path *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct mon_msg *msg_array[MON_MSGLIM];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) unsigned int write_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned int read_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) atomic_t msglim_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) atomic_t read_ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) atomic_t iucv_connected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) atomic_t iucv_severed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static unsigned long mon_in_use = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static unsigned long mon_dcss_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static unsigned long mon_dcss_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static u8 user_data_connect[16] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* Version code, must be 0x01 for shared mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 0x01,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* what to collect */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) MON_COLLECT_SAMPLE | MON_COLLECT_EVENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* DCSS name in EBCDIC, 8 bytes padded with blanks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static u8 user_data_sever[16] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static struct device *monreader_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * helper functions *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) *****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Create the 8 bytes EBCDIC DCSS segment name from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * an ASCII name, incl. padding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static void dcss_mkname(char *ascii_name, char *ebcdic_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) for (i = 0; i < 8; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (ascii_name[i] == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ebcdic_name[i] = toupper(ascii_name[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) for (; i < 8; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ebcdic_name[i] = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) ASCEBC(ebcdic_name, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static inline unsigned long mon_mca_start(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return *(u32 *) &monmsg->msg.rmmsg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static inline unsigned long mon_mca_end(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return *(u32 *) &monmsg->msg.rmmsg[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static inline u8 mon_mca_type(struct mon_msg *monmsg, u8 index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline u32 mon_mca_size(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static inline u32 mon_rec_start(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static inline u32 mon_rec_end(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static int mon_check_mca(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) (mon_rec_start(monmsg) < mon_dcss_start) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) (mon_rec_end(monmsg) > mon_dcss_end) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) (mon_mca_type(monmsg, 0) == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) (mon_mca_size(monmsg) % 12 != 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) (mon_mca_end(monmsg) <= mon_mca_start(monmsg)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) (mon_mca_end(monmsg) > mon_dcss_end) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) (mon_mca_start(monmsg) < mon_dcss_start) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static int mon_send_reply(struct mon_msg *monmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct mon_private *monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) rc = iucv_message_reply(monpriv->path, &monmsg->msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) IUCV_IPRMDATA, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) atomic_dec(&monpriv->msglim_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (likely(!monmsg->msglim_reached)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) monmsg->pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) monmsg->mca_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) monpriv->read_index = (monpriv->read_index + 1) %
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) MON_MSGLIM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) atomic_dec(&monpriv->read_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) monmsg->replied_msglim = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) pr_err("Reading monitor data failed with rc=%i\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static void mon_free_mem(struct mon_private *monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) for (i = 0; i < MON_MSGLIM; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) kfree(monpriv->msg_array[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) kfree(monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static struct mon_private *mon_alloc_mem(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct mon_private *monpriv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (!monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) for (i = 0; i < MON_MSGLIM; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (!monpriv->msg_array[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) mon_free_mem(monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return monpriv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static inline void mon_next_mca(struct mon_msg *monmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) monmsg->mca_offset += 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) monmsg->pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static struct mon_msg *mon_next_message(struct mon_private *monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct mon_msg *monmsg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (!atomic_read(&monpriv->read_ready))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) monmsg = monpriv->msg_array[monpriv->read_index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (unlikely(monmsg->replied_msglim)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) monmsg->replied_msglim = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) monmsg->msglim_reached = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) monmsg->pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) monmsg->mca_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) monpriv->read_index = (monpriv->read_index + 1) %
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) MON_MSGLIM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) atomic_dec(&monpriv->read_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return ERR_PTR(-EOVERFLOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return monmsg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * IUCV handler *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) *****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static void mon_iucv_path_complete(struct iucv_path *path, u8 *ipuser)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) struct mon_private *monpriv = path->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) atomic_set(&monpriv->iucv_connected, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) wake_up(&mon_conn_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static void mon_iucv_path_severed(struct iucv_path *path, u8 *ipuser)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct mon_private *monpriv = path->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pr_err("z/VM *MONITOR system service disconnected with rc=%i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) ipuser[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) iucv_path_sever(path, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) atomic_set(&monpriv->iucv_severed, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) wake_up(&mon_conn_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) wake_up_interruptible(&mon_read_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static void mon_iucv_message_pending(struct iucv_path *path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct iucv_message *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct mon_private *monpriv = path->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) memcpy(&monpriv->msg_array[monpriv->write_index]->msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) msg, sizeof(*msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) pr_warn("The read queue for monitor data is full\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) monpriv->msg_array[monpriv->write_index]->msglim_reached = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) atomic_inc(&monpriv->read_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) wake_up_interruptible(&mon_read_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static struct iucv_handler monreader_iucv_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) .path_complete = mon_iucv_path_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) .path_severed = mon_iucv_path_severed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) .message_pending = mon_iucv_message_pending,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * file operations *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) *****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static int mon_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) struct mon_private *monpriv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * only one user allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (test_and_set_bit(MON_IN_USE, &mon_in_use))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) monpriv = mon_alloc_mem();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (!monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) goto out_use;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * Connect to *MONITOR service
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (!monpriv->path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) goto out_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) MON_SERVICE, NULL, user_data_connect, monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) pr_err("Connecting to the z/VM *MONITOR system service "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) "failed with rc=%i\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) goto out_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * Wait for connection confirmation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) wait_event(mon_conn_wait_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) atomic_read(&monpriv->iucv_connected) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) atomic_read(&monpriv->iucv_severed));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (atomic_read(&monpriv->iucv_severed)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) atomic_set(&monpriv->iucv_severed, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) atomic_set(&monpriv->iucv_connected, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) goto out_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) filp->private_data = monpriv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) dev_set_drvdata(monreader_device, monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return nonseekable_open(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) out_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) iucv_path_free(monpriv->path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) out_priv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) mon_free_mem(monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) out_use:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) clear_bit(MON_IN_USE, &mon_in_use);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static int mon_close(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int rc, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct mon_private *monpriv = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * Close IUCV connection and unregister
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (monpriv->path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) rc = iucv_path_sever(monpriv->path, user_data_sever);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) pr_warn("Disconnecting the z/VM *MONITOR system service failed with rc=%i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) iucv_path_free(monpriv->path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) atomic_set(&monpriv->iucv_severed, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) atomic_set(&monpriv->iucv_connected, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) atomic_set(&monpriv->read_ready, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) atomic_set(&monpriv->msglim_count, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) monpriv->write_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) monpriv->read_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) dev_set_drvdata(monreader_device, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) for (i = 0; i < MON_MSGLIM; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) kfree(monpriv->msg_array[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) kfree(monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) clear_bit(MON_IN_USE, &mon_in_use);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) static ssize_t mon_read(struct file *filp, char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) struct mon_private *monpriv = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct mon_msg *monmsg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) u32 mce_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) monmsg = mon_next_message(monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (IS_ERR(monmsg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return PTR_ERR(monmsg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (!monmsg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) if (filp->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) ret = wait_event_interruptible(mon_read_wait_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) atomic_read(&monpriv->read_ready) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) atomic_read(&monpriv->iucv_severed));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (unlikely(atomic_read(&monpriv->iucv_severed)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) monmsg = monpriv->msg_array[monpriv->read_index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (!monmsg->pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (mon_check_mca(monmsg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) goto reply;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /* read monitor control element (12 bytes) first */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) mce_start = mon_mca_start(monmsg) + monmsg->mca_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) count = min(count, (size_t) mce_start + 12 - monmsg->pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) monmsg->pos += count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (monmsg->pos == mce_start + 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) monmsg->pos = mon_rec_start(monmsg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) goto out_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) /* read records */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (monmsg->pos <= mon_rec_end(monmsg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) monmsg->pos += count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (monmsg->pos > mon_rec_end(monmsg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) mon_next_mca(monmsg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) goto out_copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) reply:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) ret = mon_send_reply(monmsg, monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) out_copy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) *ppos += count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) static __poll_t mon_poll(struct file *filp, struct poll_table_struct *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) struct mon_private *monpriv = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) poll_wait(filp, &mon_read_wait_queue, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (unlikely(atomic_read(&monpriv->iucv_severed)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return EPOLLERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (atomic_read(&monpriv->read_ready))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) static const struct file_operations mon_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) .open = &mon_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) .release = &mon_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) .read = &mon_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) .poll = &mon_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) static struct miscdevice mon_dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) .name = "monreader",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) .fops = &mon_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) .minor = MISC_DYNAMIC_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) * suspend / resume *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) *****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static int monreader_freeze(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct mon_private *monpriv = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (!monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (monpriv->path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) rc = iucv_path_sever(monpriv->path, user_data_sever);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) pr_warn("Disconnecting the z/VM *MONITOR system service failed with rc=%i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) iucv_path_free(monpriv->path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) atomic_set(&monpriv->iucv_severed, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) atomic_set(&monpriv->iucv_connected, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) atomic_set(&monpriv->read_ready, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) atomic_set(&monpriv->msglim_count, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) monpriv->write_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) monpriv->read_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) monpriv->path = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) static int monreader_thaw(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) struct mon_private *monpriv = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (!monpriv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (!monpriv->path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) MON_SERVICE, NULL, user_data_connect, monpriv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) pr_err("Connecting to the z/VM *MONITOR system service "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) "failed with rc=%i\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) goto out_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) wait_event(mon_conn_wait_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) atomic_read(&monpriv->iucv_connected) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) atomic_read(&monpriv->iucv_severed));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (atomic_read(&monpriv->iucv_severed))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) goto out_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) out_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) iucv_path_free(monpriv->path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) monpriv->path = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) atomic_set(&monpriv->iucv_severed, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) static int monreader_restore(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) segment_unload(mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) rc = segment_load(mon_dcss_name, SEGMENT_SHARED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) &mon_dcss_start, &mon_dcss_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) segment_warning(rc, mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) panic("fatal monreader resume error: no monitor dcss\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return monreader_thaw(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) static const struct dev_pm_ops monreader_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) .freeze = monreader_freeze,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) .thaw = monreader_thaw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) .restore = monreader_restore,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) static struct device_driver monreader_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) .name = "monreader",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) .bus = &iucv_bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) .pm = &monreader_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * module init/exit *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) *****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) static int __init mon_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (!MACHINE_IS_VM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) pr_err("The z/VM *MONITOR record device driver cannot be "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) "loaded without z/VM\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) * Register with IUCV and connect to *MONITOR service
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) rc = iucv_register(&monreader_iucv_handler, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) pr_err("The z/VM *MONITOR record device driver failed to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) "register with IUCV\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) rc = driver_register(&monreader_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) goto out_iucv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (!monreader_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) goto out_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) dev_set_name(monreader_device, "monreader-dev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) monreader_device->bus = &iucv_bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) monreader_device->parent = iucv_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) monreader_device->driver = &monreader_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) monreader_device->release = (void (*)(struct device *))kfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) rc = device_register(monreader_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) put_device(monreader_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) goto out_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) rc = segment_type(mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) segment_warning(rc, mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) goto out_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (rc != SEG_TYPE_SC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) pr_err("The specified *MONITOR DCSS %s does not have the "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) "required type SC\n", mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) goto out_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) rc = segment_load(mon_dcss_name, SEGMENT_SHARED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) &mon_dcss_start, &mon_dcss_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) segment_warning(rc, mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) goto out_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) dcss_mkname(mon_dcss_name, &user_data_connect[8]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) * misc_register() has to be the last action in module_init(), because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) * file operations will be available right after this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) rc = misc_register(&mon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if (rc < 0 )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) segment_unload(mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) out_device:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) device_unregister(monreader_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) out_driver:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) driver_unregister(&monreader_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) out_iucv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) iucv_unregister(&monreader_iucv_handler, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) static void __exit mon_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) segment_unload(mon_dcss_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) misc_deregister(&mon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) device_unregister(monreader_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) driver_unregister(&monreader_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) iucv_unregister(&monreader_iucv_handler, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) module_init(mon_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) module_exit(mon_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) module_param_string(mondcss, mon_dcss_name, 9, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) "service, max. 8 chars. Default is MONDCSS");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) MODULE_AUTHOR("Gerald Schaefer <geraldsc@de.ibm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) MODULE_DESCRIPTION("Character device driver for reading z/VM "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) "monitor service records.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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