[S390] z/VM unit record device driver
z/VM Unit record character device driver to access VM reader, punch, and printer. Signed-off-by: Frank Munzert <munzert@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Frank Munzert
Martin Schwidefsky
parent
d9d119f12f
commit
810cb5b32d
5 changed files with 1018 additions and 0 deletions
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@ -512,6 +512,7 @@ CONFIG_S390_TAPE_34XX=m
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# CONFIG_VMCP is not set
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# CONFIG_MONREADER is not set
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CONFIG_MONWRITER=m
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CONFIG_S390_VMUR=m
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# CONFIG_POWER_SUPPLY is not set
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#
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@ -164,3 +164,9 @@ config MONWRITER
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help
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Character device driver for writing z/VM monitor service records
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config S390_VMUR
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tristate "z/VM unit record device driver"
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default "m"
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help
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Character device driver for z/VM reader, puncher and printer.
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@ -29,6 +29,7 @@ obj-$(CONFIG_S390_TAPE_34XX) += tape_34xx.o
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obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o
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obj-$(CONFIG_MONREADER) += monreader.o
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obj-$(CONFIG_MONWRITER) += monwriter.o
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obj-$(CONFIG_S390_VMUR) += vmur.o
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zcore_mod-objs := sclp_sdias.o zcore.o
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obj-$(CONFIG_ZFCPDUMP) += zcore_mod.o
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906
drivers/s390/char/vmur.c
Normal file
906
drivers/s390/char/vmur.c
Normal file
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@ -0,0 +1,906 @@
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/*
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* Linux driver for System z and s390 unit record devices
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* (z/VM virtual punch, reader, printer)
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*
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* Copyright IBM Corp. 2001, 2007
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* Authors: Malcolm Beattie <beattiem@uk.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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* Frank Munzert <munzert@de.ibm.com>
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*/
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#include <linux/cdev.h>
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#include <asm/uaccess.h>
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#include <asm/cio.h>
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#include <asm/ccwdev.h>
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#include <asm/debug.h>
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#include "vmur.h"
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/*
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* Driver overview
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*
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* Unit record device support is implemented as a character device driver.
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* We can fit at least 16 bits into a device minor number and use the
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* simple method of mapping a character device number with minor abcd
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* to the unit record device with devno abcd.
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* I/O to virtual unit record devices is handled as follows:
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* Reads: Diagnose code 0x14 (input spool file manipulation)
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* is used to read spool data page-wise.
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* Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length
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* is available by reading sysfs attr reclen. Each write() to the device
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* must specify an integral multiple (maximal 511) of reclen.
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*/
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static char ur_banner[] = "z/VM virtual unit record device driver";
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver");
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MODULE_LICENSE("GPL");
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#define PRINTK_HEADER "vmur: "
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static dev_t ur_first_dev_maj_min;
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static struct class *vmur_class;
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static struct debug_info *vmur_dbf;
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/* We put the device's record length (for writes) in the driver_info field */
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static struct ccw_device_id ur_ids[] = {
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{ CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) },
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{ CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) },
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{ /* end of list */ }
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};
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MODULE_DEVICE_TABLE(ccw, ur_ids);
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static int ur_probe(struct ccw_device *cdev);
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static void ur_remove(struct ccw_device *cdev);
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static int ur_set_online(struct ccw_device *cdev);
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static int ur_set_offline(struct ccw_device *cdev);
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static struct ccw_driver ur_driver = {
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.name = "vmur",
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.owner = THIS_MODULE,
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.ids = ur_ids,
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.probe = ur_probe,
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.remove = ur_remove,
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.set_online = ur_set_online,
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.set_offline = ur_set_offline,
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};
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/*
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* Allocation, freeing, getting and putting of urdev structures
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*/
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static struct urdev *urdev_alloc(struct ccw_device *cdev)
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{
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struct urdev *urd;
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urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
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if (!urd)
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return NULL;
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urd->cdev = cdev;
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urd->reclen = cdev->id.driver_info;
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ccw_device_get_id(cdev, &urd->dev_id);
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mutex_init(&urd->io_mutex);
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mutex_init(&urd->open_mutex);
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return urd;
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}
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static void urdev_free(struct urdev *urd)
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{
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kfree(urd);
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}
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/*
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* This is how the character device driver gets a reference to a
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* ur device. When this call returns successfully, a reference has
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* been taken (by get_device) on the underlying kobject. The recipient
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* of this urdev pointer must eventually drop it with urdev_put(urd)
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* which does the corresponding put_device().
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*/
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static struct urdev *urdev_get_from_devno(u16 devno)
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{
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char bus_id[16];
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struct ccw_device *cdev;
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sprintf(bus_id, "0.0.%04x", devno);
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cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
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if (!cdev)
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return NULL;
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return cdev->dev.driver_data;
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}
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static void urdev_put(struct urdev *urd)
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{
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put_device(&urd->cdev->dev);
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}
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/*
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* Low-level functions to do I/O to a ur device.
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* alloc_chan_prog
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* do_ur_io
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* ur_int_handler
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*
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* alloc_chan_prog allocates and builds the channel program
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*
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* do_ur_io issues the channel program to the device and blocks waiting
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* on a completion event it publishes at urd->io_done. The function
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* serialises itself on the device's mutex so that only one I/O
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* is issued at a time (and that I/O is synchronous).
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*
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* ur_int_handler catches the "I/O done" interrupt, writes the
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* subchannel status word into the scsw member of the urdev structure
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* and complete()s the io_done to wake the waiting do_ur_io.
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*
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* The caller of do_ur_io is responsible for kfree()ing the channel program
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* address pointer that alloc_chan_prog returned.
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*/
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/*
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* alloc_chan_prog
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* The channel program we use is write commands chained together
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* with a final NOP CCW command-chained on (which ensures that CE and DE
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* are presented together in a single interrupt instead of as separate
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* interrupts unless an incorrect length indication kicks in first). The
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* data length in each CCW is reclen. The caller must ensure that count
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* is an integral multiple of reclen.
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* The channel program pointer returned by this function must be freed
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* with kfree. The caller is responsible for checking that
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* count/reclen is not ridiculously large.
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*/
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static struct ccw1 *alloc_chan_prog(char *buf, size_t count, size_t reclen)
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{
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size_t num_ccws;
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struct ccw1 *cpa;
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int i;
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TRACE("alloc_chan_prog(%p, %zu, %zu)\n", buf, count, reclen);
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/*
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* We chain a NOP onto the writes to force CE+DE together.
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* That means we allocate room for CCWs to cover count/reclen
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* records plus a NOP.
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*/
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num_ccws = count / reclen + 1;
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cpa = kmalloc(num_ccws * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
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if (!cpa)
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return NULL;
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for (i = 0; count; i++) {
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cpa[i].cmd_code = WRITE_CCW_CMD;
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cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI;
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cpa[i].count = reclen;
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cpa[i].cda = __pa(buf);
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buf += reclen;
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count -= reclen;
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}
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/* The following NOP CCW forces CE+DE to be presented together */
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cpa[i].cmd_code = CCW_CMD_NOOP;
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cpa[i].flags = 0;
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cpa[i].count = 0;
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cpa[i].cda = 0;
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return cpa;
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}
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static int do_ur_io(struct urdev *urd, struct ccw1 *cpa)
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{
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int rc;
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struct ccw_device *cdev = urd->cdev;
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DECLARE_COMPLETION(event);
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TRACE("do_ur_io: cpa=%p\n", cpa);
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rc = mutex_lock_interruptible(&urd->io_mutex);
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if (rc)
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return rc;
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urd->io_done = &event;
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spin_lock_irq(get_ccwdev_lock(cdev));
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rc = ccw_device_start(cdev, cpa, 1, 0, 0);
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spin_unlock_irq(get_ccwdev_lock(cdev));
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TRACE("do_ur_io: ccw_device_start returned %d\n", rc);
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if (rc)
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goto out;
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wait_for_completion(&event);
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TRACE("do_ur_io: I/O complete\n");
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rc = 0;
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out:
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mutex_unlock(&urd->io_mutex);
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return rc;
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}
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/*
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* ur interrupt handler, called from the ccw_device layer
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*/
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static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
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struct irb *irb)
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{
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struct urdev *urd;
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TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
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intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count);
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if (!intparm) {
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TRACE("ur_int_handler: unsolicited interrupt\n");
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return;
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}
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urd = cdev->dev.driver_data;
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/* On special conditions irb is an error pointer */
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if (IS_ERR(irb))
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urd->io_request_rc = PTR_ERR(irb);
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else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
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urd->io_request_rc = 0;
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else
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urd->io_request_rc = -EIO;
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complete(urd->io_done);
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}
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/*
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* reclen sysfs attribute - The record length to be used for write CCWs
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*/
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static ssize_t ur_attr_reclen_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct urdev *urd = dev->driver_data;
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return sprintf(buf, "%zu\n", urd->reclen);
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}
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static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);
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static int ur_create_attributes(struct device *dev)
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{
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return device_create_file(dev, &dev_attr_reclen);
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}
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static void ur_remove_attributes(struct device *dev)
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{
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device_remove_file(dev, &dev_attr_reclen);
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}
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/*
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* diagnose code 0x210 - retrieve device information
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* cc=0 normal completion, we have a real device
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* cc=1 CP paging error
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* cc=2 The virtual device exists, but is not associated with a real device
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* cc=3 Invalid device address, or the virtual device does not exist
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*/
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static int get_urd_class(struct urdev *urd)
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{
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static struct diag210 ur_diag210;
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int cc;
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ur_diag210.vrdcdvno = urd->dev_id.devno;
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ur_diag210.vrdclen = sizeof(struct diag210);
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cc = diag210(&ur_diag210);
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switch (cc) {
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case 0:
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return -ENOTSUPP;
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case 2:
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return ur_diag210.vrdcvcla; /* virtual device class */
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case 3:
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return -ENODEV;
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default:
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return -EIO;
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}
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}
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/*
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* Allocation and freeing of urfile structures
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*/
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static struct urfile *urfile_alloc(struct urdev *urd)
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{
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struct urfile *urf;
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urf = kzalloc(sizeof(struct urfile), GFP_KERNEL);
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if (!urf)
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return NULL;
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urf->urd = urd;
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TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf,
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urf->dev_reclen);
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return urf;
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}
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static void urfile_free(struct urfile *urf)
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{
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TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);
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kfree(urf);
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}
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/*
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* The fops implementation of the character device driver
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*/
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static ssize_t do_write(struct urdev *urd, const char __user *udata,
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size_t count, size_t reclen, loff_t *ppos)
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{
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struct ccw1 *cpa;
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char *buf;
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int rc;
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/* Data buffer must be under 2GB line for fmt1 CCWs: hence GFP_DMA */
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buf = kmalloc(count, GFP_KERNEL | GFP_DMA);
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if (!buf)
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return -ENOMEM;
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if (copy_from_user(buf, udata, count)) {
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rc = -EFAULT;
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goto fail_kfree_buf;
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}
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cpa = alloc_chan_prog(buf, count, reclen);
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if (!cpa) {
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rc = -ENOMEM;
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goto fail_kfree_buf;
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}
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rc = do_ur_io(urd, cpa);
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if (rc)
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goto fail_kfree_cpa;
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if (urd->io_request_rc) {
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rc = urd->io_request_rc;
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goto fail_kfree_cpa;
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}
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*ppos += count;
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rc = count;
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fail_kfree_cpa:
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kfree(cpa);
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fail_kfree_buf:
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kfree(buf);
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return rc;
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}
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static ssize_t ur_write(struct file *file, const char __user *udata,
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size_t count, loff_t *ppos)
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{
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struct urfile *urf = file->private_data;
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TRACE("ur_write: count=%zu\n", count);
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if (count == 0)
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return 0;
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if (count % urf->dev_reclen)
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return -EINVAL; /* count must be a multiple of reclen */
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if (count > urf->dev_reclen * MAX_RECS_PER_IO)
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count = urf->dev_reclen * MAX_RECS_PER_IO;
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return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
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}
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static int do_diag_14(unsigned long rx, unsigned long ry1,
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unsigned long subcode)
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{
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register unsigned long _ry1 asm("2") = ry1;
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register unsigned long _ry2 asm("3") = subcode;
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int rc = 0;
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asm volatile(
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#ifdef CONFIG_64BIT
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" sam31\n"
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" diag %2,2,0x14\n"
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" sam64\n"
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#else
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" diag %2,2,0x14\n"
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#endif
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (rc), "+d" (_ry2)
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: "d" (rx), "d" (_ry1)
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: "cc");
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TRACE("diag 14: subcode=0x%lx, cc=%i\n", subcode, rc);
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return rc;
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}
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/*
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* diagnose code 0x14 subcode 0x0028 - position spool file to designated
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* record
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* cc=0 normal completion
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* cc=2 no file active on the virtual reader or device not ready
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* cc=3 record specified is beyond EOF
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*/
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static int diag_position_to_record(int devno, int record)
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{
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int cc;
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cc = do_diag_14(record, devno, 0x28);
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switch (cc) {
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case 0:
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return 0;
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case 2:
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return -ENOMEDIUM;
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case 3:
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return -ENODATA; /* position beyond end of file */
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default:
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return -EIO;
|
||||
}
|
||||
}
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||||
|
||||
/*
|
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* diagnose code 0x14 subcode 0x0000 - read next spool file buffer
|
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* cc=0 normal completion
|
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* cc=1 EOF reached
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* cc=2 no file active on the virtual reader, and no file eligible
|
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* cc=3 file already active on the virtual reader or specified virtual
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* reader does not exist or is not a reader
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*/
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static int diag_read_file(int devno, char *buf)
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{
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int cc;
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cc = do_diag_14((unsigned long) buf, devno, 0x00);
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switch (cc) {
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case 0:
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return 0;
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case 1:
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return -ENODATA;
|
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case 2:
|
||||
return -ENOMEDIUM;
|
||||
default:
|
||||
return -EIO;
|
||||
}
|
||||
}
|
||||
|
||||
static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count,
|
||||
loff_t *offs)
|
||||
{
|
||||
size_t len, copied, res;
|
||||
char *buf;
|
||||
int rc;
|
||||
u16 reclen;
|
||||
struct urdev *urd;
|
||||
|
||||
urd = ((struct urfile *) file->private_data)->urd;
|
||||
reclen = ((struct urfile *) file->private_data)->file_reclen;
|
||||
|
||||
rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1);
|
||||
if (rc == -ENODATA)
|
||||
return 0;
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
len = min((size_t) PAGE_SIZE, count);
|
||||
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
||||
if (!buf)
|
||||
return -ENOMEM;
|
||||
|
||||
copied = 0;
|
||||
res = (size_t) (*offs % PAGE_SIZE);
|
||||
do {
|
||||
rc = diag_read_file(urd->dev_id.devno, buf);
|
||||
if (rc == -ENODATA) {
|
||||
break;
|
||||
}
|
||||
if (rc)
|
||||
goto fail;
|
||||
if (reclen)
|
||||
*((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen;
|
||||
len = min(count - copied, PAGE_SIZE - res);
|
||||
if (copy_to_user(ubuf + copied, buf + res, len)) {
|
||||
rc = -EFAULT;
|
||||
goto fail;
|
||||
}
|
||||
res = 0;
|
||||
copied += len;
|
||||
} while (copied != count);
|
||||
|
||||
*offs += copied;
|
||||
rc = copied;
|
||||
fail:
|
||||
kfree(buf);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count,
|
||||
loff_t *offs)
|
||||
{
|
||||
struct urdev *urd;
|
||||
int rc;
|
||||
|
||||
TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs);
|
||||
|
||||
if (count == 0)
|
||||
return 0;
|
||||
|
||||
urd = ((struct urfile *) file->private_data)->urd;
|
||||
rc = mutex_lock_interruptible(&urd->io_mutex);
|
||||
if (rc)
|
||||
return rc;
|
||||
rc = diag14_read(file, ubuf, count, offs);
|
||||
mutex_unlock(&urd->io_mutex);
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
* diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor
|
||||
* cc=0 normal completion
|
||||
* cc=1 no files on reader queue or no subsequent file
|
||||
* cc=2 spid specified is invalid
|
||||
*/
|
||||
static int diag_read_next_file_info(struct file_control_block *buf, int spid)
|
||||
{
|
||||
int cc;
|
||||
|
||||
cc = do_diag_14((unsigned long) buf, spid, 0xfff);
|
||||
switch (cc) {
|
||||
case 0:
|
||||
return 0;
|
||||
default:
|
||||
return -ENODATA;
|
||||
}
|
||||
}
|
||||
|
||||
static int verify_device(struct urdev *urd)
|
||||
{
|
||||
struct file_control_block fcb;
|
||||
char *buf;
|
||||
int rc;
|
||||
|
||||
switch (urd->class) {
|
||||
case DEV_CLASS_UR_O:
|
||||
return 0; /* no check needed here */
|
||||
case DEV_CLASS_UR_I:
|
||||
/* check for empty reader device (beginning of chain) */
|
||||
rc = diag_read_next_file_info(&fcb, 0);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/* open file on virtual reader */
|
||||
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
||||
if (!buf)
|
||||
return -ENOMEM;
|
||||
rc = diag_read_file(urd->dev_id.devno, buf);
|
||||
kfree(buf);
|
||||
|
||||
if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */
|
||||
return rc;
|
||||
return 0;
|
||||
default:
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
}
|
||||
|
||||
static int get_file_reclen(struct urdev *urd)
|
||||
{
|
||||
struct file_control_block fcb;
|
||||
int rc;
|
||||
|
||||
switch (urd->class) {
|
||||
case DEV_CLASS_UR_O:
|
||||
return 0;
|
||||
case DEV_CLASS_UR_I:
|
||||
rc = diag_read_next_file_info(&fcb, 0);
|
||||
if (rc)
|
||||
return rc;
|
||||
break;
|
||||
default:
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
if (fcb.file_stat & FLG_CP_DUMP)
|
||||
return 0;
|
||||
|
||||
return fcb.rec_len;
|
||||
}
|
||||
|
||||
static int ur_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
u16 devno;
|
||||
struct urdev *urd;
|
||||
struct urfile *urf;
|
||||
unsigned short accmode;
|
||||
int rc;
|
||||
|
||||
accmode = file->f_flags & O_ACCMODE;
|
||||
|
||||
if (accmode == O_RDWR)
|
||||
return -EACCES;
|
||||
|
||||
/*
|
||||
* We treat the minor number as the devno of the ur device
|
||||
* to find in the driver tree.
|
||||
*/
|
||||
devno = MINOR(file->f_dentry->d_inode->i_rdev);
|
||||
|
||||
urd = urdev_get_from_devno(devno);
|
||||
if (!urd)
|
||||
return -ENXIO;
|
||||
|
||||
if (file->f_flags & O_NONBLOCK) {
|
||||
if (!mutex_trylock(&urd->open_mutex)) {
|
||||
rc = -EBUSY;
|
||||
goto fail_put;
|
||||
}
|
||||
} else {
|
||||
if (mutex_lock_interruptible(&urd->open_mutex)) {
|
||||
rc = -ERESTARTSYS;
|
||||
goto fail_put;
|
||||
}
|
||||
}
|
||||
|
||||
TRACE("ur_open\n");
|
||||
|
||||
if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) ||
|
||||
((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) {
|
||||
TRACE("ur_open: unsupported dev class (%d)\n", urd->class);
|
||||
rc = -EACCES;
|
||||
goto fail_unlock;
|
||||
}
|
||||
|
||||
rc = verify_device(urd);
|
||||
if (rc)
|
||||
goto fail_unlock;
|
||||
|
||||
urf = urfile_alloc(urd);
|
||||
if (!urf) {
|
||||
rc = -ENOMEM;
|
||||
goto fail_unlock;
|
||||
}
|
||||
|
||||
urf->dev_reclen = urd->reclen;
|
||||
rc = get_file_reclen(urd);
|
||||
if (rc < 0)
|
||||
goto fail_urfile_free;
|
||||
urf->file_reclen = rc;
|
||||
file->private_data = urf;
|
||||
return 0;
|
||||
|
||||
fail_urfile_free:
|
||||
urfile_free(urf);
|
||||
fail_unlock:
|
||||
mutex_unlock(&urd->open_mutex);
|
||||
fail_put:
|
||||
urdev_put(urd);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int ur_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct urfile *urf = file->private_data;
|
||||
|
||||
TRACE("ur_release\n");
|
||||
mutex_unlock(&urf->urd->open_mutex);
|
||||
urdev_put(urf->urd);
|
||||
urfile_free(urf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static loff_t ur_llseek(struct file *file, loff_t offset, int whence)
|
||||
{
|
||||
loff_t newpos;
|
||||
|
||||
if ((file->f_flags & O_ACCMODE) != O_RDONLY)
|
||||
return -ESPIPE; /* seek allowed only for reader */
|
||||
if (offset % PAGE_SIZE)
|
||||
return -ESPIPE; /* only multiples of 4K allowed */
|
||||
switch (whence) {
|
||||
case 0: /* SEEK_SET */
|
||||
newpos = offset;
|
||||
break;
|
||||
case 1: /* SEEK_CUR */
|
||||
newpos = file->f_pos + offset;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
file->f_pos = newpos;
|
||||
return newpos;
|
||||
}
|
||||
|
||||
static struct file_operations ur_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = ur_open,
|
||||
.release = ur_release,
|
||||
.read = ur_read,
|
||||
.write = ur_write,
|
||||
.llseek = ur_llseek,
|
||||
};
|
||||
|
||||
/*
|
||||
* ccw_device infrastructure:
|
||||
* ur_probe gets its own ref to the device (i.e. get_device),
|
||||
* creates the struct urdev, the device attributes, sets up
|
||||
* the interrupt handler and validates the virtual unit record device.
|
||||
* ur_remove removes the device attributes, frees the struct urdev
|
||||
* and drops (put_device) the ref to the device we got in ur_probe.
|
||||
*/
|
||||
static int ur_probe(struct ccw_device *cdev)
|
||||
{
|
||||
struct urdev *urd;
|
||||
int rc;
|
||||
|
||||
TRACE("ur_probe: cdev=%p state=%d\n", cdev, *(int *) cdev->private);
|
||||
|
||||
if (!get_device(&cdev->dev))
|
||||
return -ENODEV;
|
||||
|
||||
urd = urdev_alloc(cdev);
|
||||
if (!urd) {
|
||||
rc = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
rc = ur_create_attributes(&cdev->dev);
|
||||
if (rc) {
|
||||
rc = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
cdev->dev.driver_data = urd;
|
||||
cdev->handler = ur_int_handler;
|
||||
|
||||
/* validate virtual unit record device */
|
||||
urd->class = get_urd_class(urd);
|
||||
if (urd->class < 0) {
|
||||
rc = urd->class;
|
||||
goto fail;
|
||||
}
|
||||
if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {
|
||||
rc = -ENOTSUPP;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
urdev_free(urd);
|
||||
put_device(&cdev->dev);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void ur_remove(struct ccw_device *cdev)
|
||||
{
|
||||
struct urdev *urd = cdev->dev.driver_data;
|
||||
|
||||
TRACE("ur_remove\n");
|
||||
if (cdev->online)
|
||||
ur_set_offline(cdev);
|
||||
ur_remove_attributes(&cdev->dev);
|
||||
urdev_free(urd);
|
||||
put_device(&cdev->dev);
|
||||
}
|
||||
|
||||
static int ur_set_online(struct ccw_device *cdev)
|
||||
{
|
||||
struct urdev *urd;
|
||||
int minor, major, rc;
|
||||
char node_id[16];
|
||||
|
||||
TRACE("ur_set_online: cdev=%p state=%d\n", cdev,
|
||||
*(int *) cdev->private);
|
||||
|
||||
if (!try_module_get(ur_driver.owner))
|
||||
return -EINVAL;
|
||||
|
||||
urd = (struct urdev *) cdev->dev.driver_data;
|
||||
minor = urd->dev_id.devno;
|
||||
major = MAJOR(ur_first_dev_maj_min);
|
||||
|
||||
urd->char_device = cdev_alloc();
|
||||
if (!urd->char_device) {
|
||||
rc = -ENOMEM;
|
||||
goto fail_module_put;
|
||||
}
|
||||
|
||||
cdev_init(urd->char_device, &ur_fops);
|
||||
urd->char_device->dev = MKDEV(major, minor);
|
||||
urd->char_device->owner = ur_fops.owner;
|
||||
|
||||
rc = cdev_add(urd->char_device, urd->char_device->dev, 1);
|
||||
if (rc)
|
||||
goto fail_free_cdev;
|
||||
if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) {
|
||||
if (urd->class == DEV_CLASS_UR_I)
|
||||
sprintf(node_id, "vmrdr-%s", cdev->dev.bus_id);
|
||||
if (urd->class == DEV_CLASS_UR_O)
|
||||
sprintf(node_id, "vmpun-%s", cdev->dev.bus_id);
|
||||
} else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) {
|
||||
sprintf(node_id, "vmprt-%s", cdev->dev.bus_id);
|
||||
} else {
|
||||
rc = -ENOTSUPP;
|
||||
goto fail_free_cdev;
|
||||
}
|
||||
|
||||
urd->device = device_create(vmur_class, NULL, urd->char_device->dev,
|
||||
"%s", node_id);
|
||||
if (IS_ERR(urd->device)) {
|
||||
rc = PTR_ERR(urd->device);
|
||||
TRACE("ur_set_online: device_create rc=%d\n", rc);
|
||||
goto fail_free_cdev;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail_free_cdev:
|
||||
cdev_del(urd->char_device);
|
||||
fail_module_put:
|
||||
module_put(ur_driver.owner);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int ur_set_offline(struct ccw_device *cdev)
|
||||
{
|
||||
struct urdev *urd;
|
||||
|
||||
TRACE("ur_set_offline: cdev=%p cdev->private=%p state=%d\n",
|
||||
cdev, cdev->private, *(int *) cdev->private);
|
||||
urd = (struct urdev *) cdev->dev.driver_data;
|
||||
device_destroy(vmur_class, urd->char_device->dev);
|
||||
cdev_del(urd->char_device);
|
||||
module_put(ur_driver.owner);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Module initialisation and cleanup
|
||||
*/
|
||||
static int __init ur_init(void)
|
||||
{
|
||||
int rc;
|
||||
dev_t dev;
|
||||
|
||||
if (!MACHINE_IS_VM) {
|
||||
PRINT_ERR("%s is only available under z/VM.\n", ur_banner);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long));
|
||||
if (!vmur_dbf)
|
||||
return -ENOMEM;
|
||||
rc = debug_register_view(vmur_dbf, &debug_sprintf_view);
|
||||
if (rc)
|
||||
goto fail_free_dbf;
|
||||
|
||||
debug_set_level(vmur_dbf, 6);
|
||||
|
||||
rc = ccw_driver_register(&ur_driver);
|
||||
if (rc)
|
||||
goto fail_free_dbf;
|
||||
|
||||
rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur");
|
||||
if (rc) {
|
||||
PRINT_ERR("alloc_chrdev_region failed: err = %d\n", rc);
|
||||
goto fail_unregister_driver;
|
||||
}
|
||||
ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0);
|
||||
|
||||
vmur_class = class_create(THIS_MODULE, "vmur");
|
||||
if (IS_ERR(vmur_class)) {
|
||||
rc = PTR_ERR(vmur_class);
|
||||
goto fail_unregister_region;
|
||||
}
|
||||
PRINT_INFO("%s loaded.\n", ur_banner);
|
||||
return 0;
|
||||
|
||||
fail_unregister_region:
|
||||
unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
|
||||
fail_unregister_driver:
|
||||
ccw_driver_unregister(&ur_driver);
|
||||
fail_free_dbf:
|
||||
debug_unregister(vmur_dbf);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void __exit ur_exit(void)
|
||||
{
|
||||
class_destroy(vmur_class);
|
||||
unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
|
||||
ccw_driver_unregister(&ur_driver);
|
||||
debug_unregister(vmur_dbf);
|
||||
PRINT_INFO("%s unloaded.\n", ur_banner);
|
||||
}
|
||||
|
||||
module_init(ur_init);
|
||||
module_exit(ur_exit);
|
||||
104
drivers/s390/char/vmur.h
Normal file
104
drivers/s390/char/vmur.h
Normal file
|
|
@ -0,0 +1,104 @@
|
|||
/*
|
||||
* Linux driver for System z and s390 unit record devices
|
||||
* (z/VM virtual punch, reader, printer)
|
||||
*
|
||||
* Copyright IBM Corp. 2001, 2007
|
||||
* Authors: Malcolm Beattie <beattiem@uk.ibm.com>
|
||||
* Michael Holzheu <holzheu@de.ibm.com>
|
||||
* Frank Munzert <munzert@de.ibm.com>
|
||||
*/
|
||||
|
||||
#ifndef _VMUR_H_
|
||||
#define _VMUR_H_
|
||||
|
||||
#define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */
|
||||
#define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */
|
||||
/*
|
||||
* we only support z/VM's default unit record devices:
|
||||
* both in SPOOL directory control statement and in CP DEFINE statement
|
||||
* RDR defaults to 2540 reader
|
||||
* PUN defaults to 2540 punch
|
||||
* PRT defaults to 1403 printer
|
||||
*/
|
||||
#define READER_PUNCH_DEVTYPE 0x2540
|
||||
#define PRINTER_DEVTYPE 0x1403
|
||||
|
||||
/* z/VM spool file control block SFBLOK */
|
||||
struct file_control_block {
|
||||
char reserved_1[8];
|
||||
char user_owner[8];
|
||||
char user_orig[8];
|
||||
__s32 data_recs;
|
||||
__s16 rec_len;
|
||||
__s16 file_num;
|
||||
__u8 file_stat;
|
||||
__u8 dev_type;
|
||||
char reserved_2[6];
|
||||
char file_name[12];
|
||||
char file_type[12];
|
||||
char create_date[8];
|
||||
char create_time[8];
|
||||
char reserved_3[6];
|
||||
__u8 file_class;
|
||||
__u8 sfb_lok;
|
||||
__u64 distr_code;
|
||||
__u32 reserved_4;
|
||||
__u8 current_starting_copy_number;
|
||||
__u8 sfblock_cntrl_flags;
|
||||
__u8 reserved_5;
|
||||
__u8 more_status_flags;
|
||||
char rest[200];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
#define FLG_CP_DUMP 0x10
|
||||
|
||||
/*
|
||||
* A struct urdev is created for each ur device that is made available
|
||||
* via the ccw_device driver model.
|
||||
*/
|
||||
struct urdev {
|
||||
struct ccw_device *cdev; /* Backpointer to ccw device */
|
||||
struct mutex io_mutex; /* Serialises device IO */
|
||||
struct mutex open_mutex; /* Serialises access to device */
|
||||
struct completion *io_done; /* do_ur_io waits; irq completes */
|
||||
struct device *device;
|
||||
struct cdev *char_device;
|
||||
struct ccw_dev_id dev_id; /* device id */
|
||||
size_t reclen; /* Record length for *write* CCWs */
|
||||
int class; /* VM device class */
|
||||
int io_request_rc; /* return code from I/O request */
|
||||
};
|
||||
|
||||
/*
|
||||
* A struct urfile is allocated at open() time for each device and
|
||||
* freed on release().
|
||||
*/
|
||||
struct urfile {
|
||||
struct urdev *urd;
|
||||
unsigned int flags;
|
||||
size_t dev_reclen;
|
||||
__u16 file_reclen;
|
||||
};
|
||||
|
||||
/*
|
||||
* Device major/minor definitions.
|
||||
*/
|
||||
|
||||
#define UR_MAJOR 0 /* get dynamic major */
|
||||
/*
|
||||
* We map minor numbers directly to device numbers (0-FFFF) for simplicity.
|
||||
* This avoids having to allocate (and manage) slot numbers.
|
||||
*/
|
||||
#define NUM_MINORS 65536
|
||||
|
||||
/* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */
|
||||
#define MAX_RECS_PER_IO 511
|
||||
#define WRITE_CCW_CMD 0x01
|
||||
|
||||
#define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x)
|
||||
#define CCWDEV_CU_DI(cutype, di) \
|
||||
CCW_DEVICE(cutype, 0x00), .driver_info = (di)
|
||||
|
||||
#define FILE_RECLEN_OFFSET 4064 /* reclen offset in spool data block */
|
||||
|
||||
#endif /* _VMUR_H_ */
|
||||
Loading…
Reference in a new issue