[S390] z/VM unit record device driver (810cb5b3) · Commits · e / devices / android_kernel_fairphone_FP4

arch/s390/defconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -512,6 +512,7 @@ CONFIG_S390_TAPE_34XX=m
		# CONFIG_VMCP is not set
		# CONFIG_MONREADER is not set
		CONFIG_MONWRITER=m
		CONFIG_S390_VMUR=m
		# CONFIG_POWER_SUPPLY is not set

		#

drivers/s390/char/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -164,3 +164,9 @@ config MONWRITER
		help
		Character device driver for writing z/VM monitor service records

		config S390_VMUR
		tristate "z/VM unit record device driver"
		default "m"
		help
		Character device driver for z/VM reader, puncher and printer.

drivers/s390/char/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ obj-$(CONFIG_S390_TAPE_34XX) += tape_34xx.o
		obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o
		obj-$(CONFIG_MONREADER) += monreader.o
		obj-$(CONFIG_MONWRITER) += monwriter.o
		obj-$(CONFIG_S390_VMUR) += vmur.o

		zcore_mod-objs := sclp_sdias.o zcore.o
		obj-$(CONFIG_ZFCPDUMP) += zcore_mod.o

drivers/s390/char/vmur.c

0 → 100644

+906 −0

Original line number	Diff line number	Diff line
		/*
		* 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>
		*/

		#include <linux/cdev.h>

		#include <asm/uaccess.h>
		#include <asm/cio.h>
		#include <asm/ccwdev.h>
		#include <asm/debug.h>

		#include "vmur.h"

		/*
		* Driver overview
		*
		* Unit record device support is implemented as a character device driver.
		* We can fit at least 16 bits into a device minor number and use the
		* simple method of mapping a character device number with minor abcd
		* to the unit record device with devno abcd.
		* I/O to virtual unit record devices is handled as follows:
		* Reads: Diagnose code 0x14 (input spool file manipulation)
		* is used to read spool data page-wise.
		* Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length
		* is available by reading sysfs attr reclen. Each write() to the device
		* must specify an integral multiple (maximal 511) of reclen.
		*/

		static char ur_banner[] = "z/VM virtual unit record device driver";

		MODULE_AUTHOR("IBM Corporation");
		MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver");
		MODULE_LICENSE("GPL");

		#define PRINTK_HEADER "vmur: "

		static dev_t ur_first_dev_maj_min;
		static struct class *vmur_class;
		static struct debug_info *vmur_dbf;

		/* We put the device's record length (for writes) in the driver_info field */
		static struct ccw_device_id ur_ids[] = {
		{ CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) },
		{ CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) },
		{ /* end of list */ }
		};

		MODULE_DEVICE_TABLE(ccw, ur_ids);

		static int ur_probe(struct ccw_device *cdev);
		static void ur_remove(struct ccw_device *cdev);
		static int ur_set_online(struct ccw_device *cdev);
		static int ur_set_offline(struct ccw_device *cdev);

		static struct ccw_driver ur_driver = {
		.name = "vmur",
		.owner = THIS_MODULE,
		.ids = ur_ids,
		.probe = ur_probe,
		.remove = ur_remove,
		.set_online = ur_set_online,
		.set_offline = ur_set_offline,
		};

		/*
		* Allocation, freeing, getting and putting of urdev structures
		*/
		static struct urdev urdev_alloc(struct ccw_device cdev)
		{
		struct urdev *urd;

		urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
		if (!urd)
		return NULL;
		urd->cdev = cdev;
		urd->reclen = cdev->id.driver_info;
		ccw_device_get_id(cdev, &urd->dev_id);
		mutex_init(&urd->io_mutex);
		mutex_init(&urd->open_mutex);
		return urd;
		}

		static void urdev_free(struct urdev *urd)
		{
		kfree(urd);
		}

		/*
		* This is how the character device driver gets a reference to a
		* ur device. When this call returns successfully, a reference has
		* been taken (by get_device) on the underlying kobject. The recipient
		* of this urdev pointer must eventually drop it with urdev_put(urd)
		* which does the corresponding put_device().
		*/
		static struct urdev *urdev_get_from_devno(u16 devno)
		{
		char bus_id[16];
		struct ccw_device *cdev;

		sprintf(bus_id, "0.0.%04x", devno);
		cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
		if (!cdev)
		return NULL;

		return cdev->dev.driver_data;
		}

		static void urdev_put(struct urdev *urd)
		{
		put_device(&urd->cdev->dev);
		}

		/*
		* Low-level functions to do I/O to a ur device.
		* alloc_chan_prog
		* do_ur_io
		* ur_int_handler
		*
		* alloc_chan_prog allocates and builds the channel program
		*
		* do_ur_io issues the channel program to the device and blocks waiting
		* on a completion event it publishes at urd->io_done. The function
		* serialises itself on the device's mutex so that only one I/O
		* is issued at a time (and that I/O is synchronous).
		*
		* ur_int_handler catches the "I/O done" interrupt, writes the
		* subchannel status word into the scsw member of the urdev structure
		* and complete()s the io_done to wake the waiting do_ur_io.
		*
		* The caller of do_ur_io is responsible for kfree()ing the channel program
		* address pointer that alloc_chan_prog returned.
		*/


		/*
		* alloc_chan_prog
		* The channel program we use is write commands chained together
		* with a final NOP CCW command-chained on (which ensures that CE and DE
		* are presented together in a single interrupt instead of as separate
		* interrupts unless an incorrect length indication kicks in first). The
		* data length in each CCW is reclen. The caller must ensure that count
		* is an integral multiple of reclen.
		* The channel program pointer returned by this function must be freed
		* with kfree. The caller is responsible for checking that
		* count/reclen is not ridiculously large.
		*/
		static struct ccw1 alloc_chan_prog(char buf, size_t count, size_t reclen)
		{
		size_t num_ccws;
		struct ccw1 *cpa;
		int i;

		TRACE("alloc_chan_prog(%p, %zu, %zu)\n", buf, count, reclen);

		/*
		* We chain a NOP onto the writes to force CE+DE together.
		* That means we allocate room for CCWs to cover count/reclen
		* records plus a NOP.
		*/
		num_ccws = count / reclen + 1;
		cpa = kmalloc(num_ccws * sizeof(struct ccw1), GFP_KERNEL \| GFP_DMA);
		if (!cpa)
		return NULL;

		for (i = 0; count; i++) {
		cpa[i].cmd_code = WRITE_CCW_CMD;
		cpa[i].flags = CCW_FLAG_CC \| CCW_FLAG_SLI;
		cpa[i].count = reclen;
		cpa[i].cda = __pa(buf);
		buf += reclen;
		count -= reclen;
		}
		/* The following NOP CCW forces CE+DE to be presented together */
		cpa[i].cmd_code = CCW_CMD_NOOP;
		cpa[i].flags = 0;
		cpa[i].count = 0;
		cpa[i].cda = 0;

		return cpa;
		}

		static int do_ur_io(struct urdev urd, struct ccw1 cpa)
		{
		int rc;
		struct ccw_device *cdev = urd->cdev;
		DECLARE_COMPLETION(event);

		TRACE("do_ur_io: cpa=%p\n", cpa);

		rc = mutex_lock_interruptible(&urd->io_mutex);
		if (rc)
		return rc;

		urd->io_done = &event;

		spin_lock_irq(get_ccwdev_lock(cdev));
		rc = ccw_device_start(cdev, cpa, 1, 0, 0);
		spin_unlock_irq(get_ccwdev_lock(cdev));

		TRACE("do_ur_io: ccw_device_start returned %d\n", rc);
		if (rc)
		goto out;

		wait_for_completion(&event);
		TRACE("do_ur_io: I/O complete\n");
		rc = 0;

		out:
		mutex_unlock(&urd->io_mutex);
		return rc;
		}

		/*
		* ur interrupt handler, called from the ccw_device layer
		*/
		static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
		struct irb *irb)
		{
		struct urdev *urd;

		TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
		intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count);

		if (!intparm) {
		TRACE("ur_int_handler: unsolicited interrupt\n");
		return;
		}
		urd = cdev->dev.driver_data;
		/* On special conditions irb is an error pointer */
		if (IS_ERR(irb))
		urd->io_request_rc = PTR_ERR(irb);
		else if (irb->scsw.dstat == (DEV_STAT_CHN_END \| DEV_STAT_DEV_END))
		urd->io_request_rc = 0;
		else
		urd->io_request_rc = -EIO;

		complete(urd->io_done);
		}

		/*
		* reclen sysfs attribute - The record length to be used for write CCWs
		*/
		static ssize_t ur_attr_reclen_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct urdev *urd = dev->driver_data;

		return sprintf(buf, "%zu\n", urd->reclen);
		}

		static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);

		static int ur_create_attributes(struct device *dev)
		{
		return device_create_file(dev, &dev_attr_reclen);
		}

		static void ur_remove_attributes(struct device *dev)
		{
		device_remove_file(dev, &dev_attr_reclen);
		}

		/*
		* diagnose code 0x210 - retrieve device information
		* cc=0 normal completion, we have a real device
		* cc=1 CP paging error
		* cc=2 The virtual device exists, but is not associated with a real device
		* cc=3 Invalid device address, or the virtual device does not exist
		*/
		static int get_urd_class(struct urdev *urd)
		{
		static struct diag210 ur_diag210;
		int cc;

		ur_diag210.vrdcdvno = urd->dev_id.devno;
		ur_diag210.vrdclen = sizeof(struct diag210);

		cc = diag210(&ur_diag210);
		switch (cc) {
		case 0:
		return -ENOTSUPP;
		case 2:
		return ur_diag210.vrdcvcla; /* virtual device class */
		case 3:
		return -ENODEV;
		default:
		return -EIO;
		}
		}

		/*
		* Allocation and freeing of urfile structures
		*/
		static struct urfile urfile_alloc(struct urdev urd)
		{
		struct urfile *urf;

		urf = kzalloc(sizeof(struct urfile), GFP_KERNEL);
		if (!urf)
		return NULL;
		urf->urd = urd;

		TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf,
		urf->dev_reclen);

		return urf;
		}

		static void urfile_free(struct urfile *urf)
		{
		TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);
		kfree(urf);
		}

		/*
		* The fops implementation of the character device driver
		*/
		static ssize_t do_write(struct urdev urd, const char __user udata,
		size_t count, size_t reclen, loff_t *ppos)
		{
		struct ccw1 *cpa;
		char *buf;
		int rc;

		/* Data buffer must be under 2GB line for fmt1 CCWs: hence GFP_DMA */
		buf = kmalloc(count, GFP_KERNEL \| GFP_DMA);
		if (!buf)
		return -ENOMEM;

		if (copy_from_user(buf, udata, count)) {
		rc = -EFAULT;
		goto fail_kfree_buf;
		}

		cpa = alloc_chan_prog(buf, count, reclen);
		if (!cpa) {
		rc = -ENOMEM;
		goto fail_kfree_buf;
		}

		rc = do_ur_io(urd, cpa);
		if (rc)
		goto fail_kfree_cpa;

		if (urd->io_request_rc) {
		rc = urd->io_request_rc;
		goto fail_kfree_cpa;
		}
		*ppos += count;
		rc = count;
		fail_kfree_cpa:
		kfree(cpa);
		fail_kfree_buf:
		kfree(buf);
		return rc;
		}

		static ssize_t ur_write(struct file file, const char __user udata,
		size_t count, loff_t *ppos)
		{
		struct urfile *urf = file->private_data;

		TRACE("ur_write: count=%zu\n", count);

		if (count == 0)
		return 0;

		if (count % urf->dev_reclen)
		return -EINVAL; /* count must be a multiple of reclen */

		if (count > urf->dev_reclen * MAX_RECS_PER_IO)
		count = urf->dev_reclen * MAX_RECS_PER_IO;

		return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
		}

		static int do_diag_14(unsigned long rx, unsigned long ry1,
		unsigned long subcode)
		{
		register unsigned long _ry1 asm("2") = ry1;
		register unsigned long _ry2 asm("3") = subcode;
		int rc = 0;

		asm volatile(
		#ifdef CONFIG_64BIT
		" sam31\n"
		" diag %2,2,0x14\n"
		" sam64\n"
		#else
		" diag %2,2,0x14\n"
		#endif
		" ipm %0\n"
		" srl %0,28\n"
		: "=d" (rc), "+d" (_ry2)
		: "d" (rx), "d" (_ry1)
		: "cc");

		TRACE("diag 14: subcode=0x%lx, cc=%i\n", subcode, rc);
		return rc;
		}

		/*
		* diagnose code 0x14 subcode 0x0028 - position spool file to designated
		* record
		* cc=0 normal completion
		* cc=2 no file active on the virtual reader or device not ready
		* cc=3 record specified is beyond EOF
		*/
		static int diag_position_to_record(int devno, int record)
		{
		int cc;

		cc = do_diag_14(record, devno, 0x28);
		switch (cc) {
		case 0:
		return 0;
		case 2:
		return -ENOMEDIUM;
		case 3:
		return -ENODATA; /* position beyond end of file */
		default:
		return -EIO;
		}
		}

		/*
		* diagnose code 0x14 subcode 0x0000 - read next spool file buffer
		* cc=0 normal completion
		* cc=1 EOF reached
		* cc=2 no file active on the virtual reader, and no file eligible
		* cc=3 file already active on the virtual reader or specified virtual
		* reader does not exist or is not a reader
		*/
		static int diag_read_file(int devno, char *buf)
		{
		int cc;

		cc = do_diag_14((unsigned long) buf, devno, 0x00);
		switch (cc) {
		case 0:
		return 0;
		case 1:
		return -ENODATA;
		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);

drivers/s390/char/vmur.h

0 → 100644

+104 −0

Original line number	Diff line number	Diff line
		/*
		* 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_ */