^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) * Linux driver for System z and s390 unit record devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * (z/VM virtual punch, reader, printer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright IBM Corp. 2001, 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Michael Holzheu <holzheu@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Frank Munzert <munzert@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define KMSG_COMPONENT "vmur"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/cdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/cio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/ccwdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/diag.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "vmur.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Driver overview
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Unit record device support is implemented as a character device driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * We can fit at least 16 bits into a device minor number and use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * simple method of mapping a character device number with minor abcd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * to the unit record device with devno abcd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * I/O to virtual unit record devices is handled as follows:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * Reads: Diagnose code 0x14 (input spool file manipulation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * is used to read spool data page-wise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * is available by reading sysfs attr reclen. Each write() to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * must specify an integral multiple (maximal 511) of reclen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static char ur_banner[] = "z/VM virtual unit record device driver";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) MODULE_AUTHOR("IBM Corporation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static dev_t ur_first_dev_maj_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static struct class *vmur_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static struct debug_info *vmur_dbf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* We put the device's record length (for writes) in the driver_info field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static struct ccw_device_id ur_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) { /* end of list */ }
^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) MODULE_DEVICE_TABLE(ccw, ur_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static int ur_probe(struct ccw_device *cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static void ur_remove(struct ccw_device *cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int ur_set_online(struct ccw_device *cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int ur_set_offline(struct ccw_device *cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static int ur_pm_suspend(struct ccw_device *cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static struct ccw_driver ur_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) .name = "vmur",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .ids = ur_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .probe = ur_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .remove = ur_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .set_online = ur_set_online,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .set_offline = ur_set_offline,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .freeze = ur_pm_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .int_class = IRQIO_VMR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static DEFINE_MUTEX(vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Allocation, freeing, getting and putting of urdev structures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * Each ur device (urd) contains a reference to its corresponding ccw device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * ur device using dev_get_drvdata(&cdev->dev) pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * urd references:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * - ur_probe gets a urd reference, ur_remove drops the reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * dev_get_drvdata(&cdev->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * - ur_open gets a urd reference, ur_release drops the reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * (urf->urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * cdev references:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * - urdev_alloc get a cdev reference (urd->cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * - urdev_free drops the cdev reference (urd->cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * Setting and clearing of dev_get_drvdata(&cdev->dev) is protected by the ccwdev lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static struct urdev *urdev_alloc(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (!urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) urd->reclen = cdev->id.driver_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) ccw_device_get_id(cdev, &urd->dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) mutex_init(&urd->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) init_waitqueue_head(&urd->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) spin_lock_init(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) refcount_set(&urd->ref_count, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) urd->cdev = cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) get_device(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return urd;
^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 void urdev_free(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) TRACE("urdev_free: %p\n", urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (urd->cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) put_device(&urd->cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) kfree(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static void urdev_get(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) refcount_inc(&urd->ref_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) urd = dev_get_drvdata(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) urdev_get(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct urdev *urdev_get_from_devno(u16 devno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) char bus_id[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct ccw_device *cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) sprintf(bus_id, "0.0.%04x", devno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (!cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) urd = urdev_get_from_cdev(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) put_device(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static void urdev_put(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (refcount_dec_and_test(&urd->ref_count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) urdev_free(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * State and contents of ur devices can be changed by class D users issuing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * CP commands such as PURGE or TRANSFER, while the Linux guest is suspended.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * Also the Linux guest might be logged off, which causes all active spool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * files to be closed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * So we cannot guarantee that spool files are still the same when the Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * guest is resumed. In order to avoid unpredictable results at resume time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * we simply refuse to suspend if a ur device node is open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int ur_pm_suspend(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct urdev *urd = dev_get_drvdata(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) TRACE("ur_pm_suspend: cdev=%p\n", cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (urd->open_flag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) pr_err("Unit record device %s is busy, %s refusing to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) "suspend.\n", dev_name(&cdev->dev), ur_banner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * Low-level functions to do I/O to a ur device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * alloc_chan_prog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * free_chan_prog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * do_ur_io
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * ur_int_handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * alloc_chan_prog allocates and builds the channel program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * free_chan_prog frees memory of the channel program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * do_ur_io issues the channel program to the device and blocks waiting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * on a completion event it publishes at urd->io_done. The function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * serialises itself on the device's mutex so that only one I/O
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * is issued at a time (and that I/O is synchronous).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * ur_int_handler catches the "I/O done" interrupt, writes the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * subchannel status word into the scsw member of the urdev structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * and complete()s the io_done to wake the waiting do_ur_io.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * The caller of do_ur_io is responsible for kfree()ing the channel program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * address pointer that alloc_chan_prog returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static void free_chan_prog(struct ccw1 *cpa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct ccw1 *ptr = cpa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) while (ptr->cda) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) kfree((void *)(addr_t) ptr->cda);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) kfree(cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * alloc_chan_prog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * The channel program we use is write commands chained together
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * with a final NOP CCW command-chained on (which ensures that CE and DE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * are presented together in a single interrupt instead of as separate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * interrupts unless an incorrect length indication kicks in first). The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * data length in each CCW is reclen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int reclen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct ccw1 *cpa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) void *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen);
^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) * We chain a NOP onto the writes to force CE+DE together.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * That means we allocate room for CCWs to cover count/reclen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * records plus a NOP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) cpa = kcalloc(rec_count + 1, sizeof(struct ccw1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (!cpa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) for (i = 0; i < rec_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) cpa[i].cmd_code = WRITE_CCW_CMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) cpa[i].count = reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (!kbuf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) free_chan_prog(cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) cpa[i].cda = (u32)(addr_t) kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (copy_from_user(kbuf, ubuf, reclen)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) free_chan_prog(cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return ERR_PTR(-EFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) ubuf += reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /* The following NOP CCW forces CE+DE to be presented together */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) cpa[i].cmd_code = CCW_CMD_NOOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return cpa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static int do_ur_io(struct urdev *urd, struct ccw1 *cpa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) struct ccw_device *cdev = urd->cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) DECLARE_COMPLETION_ONSTACK(event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) TRACE("do_ur_io: cpa=%p\n", cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) rc = mutex_lock_interruptible(&urd->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) urd->io_done = &event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) spin_lock_irq(get_ccwdev_lock(cdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) rc = ccw_device_start(cdev, cpa, 1, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) spin_unlock_irq(get_ccwdev_lock(cdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) TRACE("do_ur_io: ccw_device_start returned %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) wait_for_completion(&event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) TRACE("do_ur_io: I/O complete\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) mutex_unlock(&urd->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * ur interrupt handler, called from the ccw_device layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct irb *irb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (!IS_ERR(irb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) irb->scsw.cmd.count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (!intparm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) TRACE("ur_int_handler: unsolicited interrupt\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) urd = dev_get_drvdata(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) BUG_ON(!urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /* On special conditions irb is an error pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (IS_ERR(irb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) urd->io_request_rc = PTR_ERR(irb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) urd->io_request_rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) urd->io_request_rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) complete(urd->io_done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * reclen sysfs attribute - The record length to be used for write CCWs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static ssize_t ur_attr_reclen_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) urd = urdev_get_from_cdev(to_ccwdev(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) if (!urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) rc = sprintf(buf, "%zu\n", urd->reclen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) urdev_put(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static int ur_create_attributes(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return device_create_file(dev, &dev_attr_reclen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) static void ur_remove_attributes(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) device_remove_file(dev, &dev_attr_reclen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * diagnose code 0x210 - retrieve device information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * cc=0 normal completion, we have a real device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * cc=1 CP paging error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * cc=2 The virtual device exists, but is not associated with a real device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * cc=3 Invalid device address, or the virtual device does not exist
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) static int get_urd_class(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static struct diag210 ur_diag210;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) ur_diag210.vrdcdvno = urd->dev_id.devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) ur_diag210.vrdclen = sizeof(struct diag210);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) cc = diag210(&ur_diag210);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return ur_diag210.vrdcvcla; /* virtual device class */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * Allocation and freeing of urfile structures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static struct urfile *urfile_alloc(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) struct urfile *urf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) urf = kzalloc(sizeof(struct urfile), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (!urf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) urf->urd = urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) urf->dev_reclen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return urf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static void urfile_free(struct urfile *urf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) kfree(urf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * The fops implementation of the character device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) static ssize_t do_write(struct urdev *urd, const char __user *udata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) size_t count, size_t reclen, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) struct ccw1 *cpa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) cpa = alloc_chan_prog(udata, count / reclen, reclen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (IS_ERR(cpa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return PTR_ERR(cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) rc = do_ur_io(urd, cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) goto fail_kfree_cpa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (urd->io_request_rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) rc = urd->io_request_rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) goto fail_kfree_cpa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) *ppos += count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) rc = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) fail_kfree_cpa:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) free_chan_prog(cpa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static ssize_t ur_write(struct file *file, const char __user *udata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct urfile *urf = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) TRACE("ur_write: count=%zu\n", count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (count % urf->dev_reclen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return -EINVAL; /* count must be a multiple of reclen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (count > urf->dev_reclen * MAX_RECS_PER_IO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) count = urf->dev_reclen * MAX_RECS_PER_IO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) * diagnose code 0x14 subcode 0x0028 - position spool file to designated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) * record
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) * cc=0 normal completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * cc=2 no file active on the virtual reader or device not ready
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * cc=3 record specified is beyond EOF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) static int diag_position_to_record(int devno, int record)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) cc = diag14(record, devno, 0x28);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return -ENOMEDIUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return -ENODATA; /* position beyond end of file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * diagnose code 0x14 subcode 0x0000 - read next spool file buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * cc=0 normal completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * cc=1 EOF reached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) * cc=2 no file active on the virtual reader, and no file eligible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * cc=3 file already active on the virtual reader or specified virtual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * reader does not exist or is not a reader
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) static int diag_read_file(int devno, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) cc = diag14((unsigned long) buf, devno, 0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return -ENOMEDIUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) loff_t *offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) size_t len, copied, res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) u16 reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) urd = ((struct urfile *) file->private_data)->urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) reclen = ((struct urfile *) file->private_data)->file_reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (rc == -ENODATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) len = min((size_t) PAGE_SIZE, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) copied = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) res = (size_t) (*offs % PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) rc = diag_read_file(urd->dev_id.devno, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (rc == -ENODATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (reclen && (copied == 0) && (*offs < PAGE_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) len = min(count - copied, PAGE_SIZE - res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (copy_to_user(ubuf + copied, buf + res, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) copied += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) } while (copied != count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) *offs += copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) rc = copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) free_page((unsigned long) buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return rc;
^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) static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) loff_t *offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) urd = ((struct urfile *) file->private_data)->urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) rc = mutex_lock_interruptible(&urd->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) rc = diag14_read(file, ubuf, count, offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) mutex_unlock(&urd->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * cc=0 normal completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * cc=1 no files on reader queue or no subsequent file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * cc=2 spid specified is invalid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) static int diag_read_next_file_info(struct file_control_block *buf, int spid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) int cc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) cc = diag14((unsigned long) buf, spid, 0xfff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) switch (cc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) return -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) static int verify_uri_device(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) struct file_control_block *fcb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if (!fcb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) /* check for empty reader device (beginning of chain) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) rc = diag_read_next_file_info(fcb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) goto fail_free_fcb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) /* if file is in hold status, we do not read it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) rc = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) goto fail_free_fcb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) /* open file on virtual reader */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) if (!buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) goto fail_free_fcb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) rc = diag_read_file(urd->dev_id.devno, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) goto fail_free_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) /* check if the file on top of the queue is open now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) rc = diag_read_next_file_info(fcb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) goto fail_free_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (!(fcb->file_stat & FLG_IN_USE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) rc = -EMFILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) goto fail_free_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) fail_free_buf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) free_page((unsigned long) buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) fail_free_fcb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) kfree(fcb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) static int verify_device(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) switch (urd->class) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) case DEV_CLASS_UR_O:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) return 0; /* no check needed here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) case DEV_CLASS_UR_I:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) return verify_uri_device(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) static int get_uri_file_reclen(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) struct file_control_block *fcb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) if (!fcb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) rc = diag_read_next_file_info(fcb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) goto fail_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) if (fcb->file_stat & FLG_CP_DUMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) rc = fcb->rec_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) fail_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) kfree(fcb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) static int get_file_reclen(struct urdev *urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) switch (urd->class) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) case DEV_CLASS_UR_O:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) case DEV_CLASS_UR_I:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) return get_uri_file_reclen(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) static int ur_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) u16 devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) struct urfile *urf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) unsigned short accmode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) accmode = file->f_flags & O_ACCMODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) if (accmode == O_RDWR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) * We treat the minor number as the devno of the ur device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) * to find in the driver tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) devno = MINOR(file_inode(file)->i_rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) urd = urdev_get_from_devno(devno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (!urd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) rc = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) spin_lock(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) while (urd->open_flag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) spin_unlock(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) if (file->f_flags & O_NONBLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) goto fail_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) rc = -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) goto fail_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) spin_lock(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) urd->open_flag++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) spin_unlock(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) TRACE("ur_open\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) TRACE("ur_open: unsupported dev class (%d)\n", urd->class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) rc = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) goto fail_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) rc = verify_device(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) goto fail_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) urf = urfile_alloc(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (!urf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) goto fail_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) urf->dev_reclen = urd->reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) rc = get_file_reclen(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) goto fail_urfile_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) urf->file_reclen = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) file->private_data = urf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) fail_urfile_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) urfile_free(urf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) fail_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) spin_lock(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) urd->open_flag--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) spin_unlock(&urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) fail_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) urdev_put(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) static int ur_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) struct urfile *urf = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) TRACE("ur_release\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) spin_lock(&urf->urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) urf->urd->open_flag--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) spin_unlock(&urf->urd->open_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) wake_up_interruptible(&urf->urd->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) urdev_put(urf->urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) urfile_free(urf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) static loff_t ur_llseek(struct file *file, loff_t offset, int whence)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) if ((file->f_flags & O_ACCMODE) != O_RDONLY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) return -ESPIPE; /* seek allowed only for reader */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) if (offset % PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) return -ESPIPE; /* only multiples of 4K allowed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) return no_seek_end_llseek(file, offset, whence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) static const struct file_operations ur_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) .open = ur_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) .release = ur_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) .read = ur_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) .write = ur_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) .llseek = ur_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * ccw_device infrastructure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * ur_probe creates the struct urdev (with refcount = 1), the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * attributes, sets up the interrupt handler and validates the virtual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) * unit record device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) * ur_remove removes the device attributes and drops the reference to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) * struct urdev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) * ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) * by the vmur_mutex lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) * urd->char_device is used as indication that the online function has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) * been completed successfully.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) static int ur_probe(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) TRACE("ur_probe: cdev=%p\n", cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) mutex_lock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) urd = urdev_alloc(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) if (!urd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) goto fail_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) rc = ur_create_attributes(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) goto fail_urdev_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) cdev->handler = ur_int_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) /* validate virtual unit record device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) urd->class = get_urd_class(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) if (urd->class < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) rc = urd->class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) goto fail_remove_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) goto fail_remove_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) spin_lock_irq(get_ccwdev_lock(cdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) dev_set_drvdata(&cdev->dev, urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) spin_unlock_irq(get_ccwdev_lock(cdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) mutex_unlock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) fail_remove_attr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) ur_remove_attributes(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) fail_urdev_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) urdev_put(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) fail_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) mutex_unlock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) static int ur_set_online(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) int minor, major, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) char node_id[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) TRACE("ur_set_online: cdev=%p\n", cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) mutex_lock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) urd = urdev_get_from_cdev(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) if (!urd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) /* ur_remove already deleted our urd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) rc = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) goto fail_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (urd->char_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) /* Another ur_set_online was faster */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) goto fail_urdev_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) minor = urd->dev_id.devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) major = MAJOR(ur_first_dev_maj_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) urd->char_device = cdev_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) if (!urd->char_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) goto fail_urdev_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) urd->char_device->ops = &ur_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) urd->char_device->owner = ur_fops.owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) rc = cdev_add(urd->char_device, MKDEV(major, minor), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) goto fail_free_cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (urd->class == DEV_CLASS_UR_I)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) sprintf(node_id, "vmrdr-%s", dev_name(&cdev->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) if (urd->class == DEV_CLASS_UR_O)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) sprintf(node_id, "vmpun-%s", dev_name(&cdev->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) sprintf(node_id, "vmprt-%s", dev_name(&cdev->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) rc = -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) goto fail_free_cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) urd->device = device_create(vmur_class, &cdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) urd->char_device->dev, NULL, "%s", node_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) if (IS_ERR(urd->device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) rc = PTR_ERR(urd->device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) TRACE("ur_set_online: device_create rc=%d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) goto fail_free_cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) urdev_put(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) mutex_unlock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) fail_free_cdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) cdev_del(urd->char_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) urd->char_device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) fail_urdev_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) urdev_put(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) fail_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) mutex_unlock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) static int ur_set_offline_force(struct ccw_device *cdev, int force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) struct urdev *urd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) TRACE("ur_set_offline: cdev=%p\n", cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) urd = urdev_get_from_cdev(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) if (!urd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) /* ur_remove already deleted our urd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) if (!urd->char_device) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) /* Another ur_set_offline was faster */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) goto fail_urdev_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) if (!force && (refcount_read(&urd->ref_count) > 2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) /* There is still a user of urd (e.g. ur_open) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) TRACE("ur_set_offline: BUSY\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) goto fail_urdev_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) device_destroy(vmur_class, urd->char_device->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) cdev_del(urd->char_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) urd->char_device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) fail_urdev_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) urdev_put(urd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) static int ur_set_offline(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) mutex_lock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) rc = ur_set_offline_force(cdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) mutex_unlock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) static void ur_remove(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) TRACE("ur_remove\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) mutex_lock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if (cdev->online)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) ur_set_offline_force(cdev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) ur_remove_attributes(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) urdev_put(dev_get_drvdata(&cdev->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) dev_set_drvdata(&cdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) mutex_unlock(&vmur_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) * Module initialisation and cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) static int __init ur_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) dev_t dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (!MACHINE_IS_VM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) pr_err("The %s cannot be loaded without z/VM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) ur_banner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) if (!vmur_dbf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) rc = debug_register_view(vmur_dbf, &debug_sprintf_view);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) goto fail_free_dbf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) debug_set_level(vmur_dbf, 6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) vmur_class = class_create(THIS_MODULE, "vmur");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) if (IS_ERR(vmur_class)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) rc = PTR_ERR(vmur_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) goto fail_free_dbf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) rc = ccw_driver_register(&ur_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) goto fail_class_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) pr_err("Kernel function alloc_chrdev_region failed with "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) "error code %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) goto fail_unregister_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) pr_info("%s loaded.\n", ur_banner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) fail_unregister_driver:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) ccw_driver_unregister(&ur_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) fail_class_destroy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) class_destroy(vmur_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) fail_free_dbf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) debug_unregister(vmur_dbf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) static void __exit ur_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) ccw_driver_unregister(&ur_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) class_destroy(vmur_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) debug_unregister(vmur_dbf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) pr_info("%s unloaded.\n", ur_banner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) module_init(ur_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) module_exit(ur_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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