1 // SPDX-License-Identifier: GPL-2.0
8  *	    Michael Holzheu <holzheu@de.ibm.com>
9  *	    Frank Munzert <munzert@de.ibm.com>
38  * is used to read spool data page-wise.
89  * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the
90  * ur device using dev_get_drvdata(&cdev->dev) pointer.
93  * - ur_probe gets a urd reference, ur_remove drops the reference
94  *   dev_get_drvdata(&cdev->dev)
95  * - ur_open gets a urd reference, ur_release drops the reference
96  *   (urf->urd)
99  * - urdev_alloc get a cdev reference (urd->cdev)
100  * - urdev_free drops the cdev reference (urd->cdev)
102  * Setting and clearing of dev_get_drvdata(&cdev->dev) is protected by the ccwdev lock
111 	urd->reclen = cdev->id.driver_info;  in urdev_alloc()
112 	ccw_device_get_id(cdev, &urd->dev_id);  in urdev_alloc()
113 	mutex_init(&urd->io_mutex);  in urdev_alloc()
114 	init_waitqueue_head(&urd->wait);  in urdev_alloc()
115 	INIT_WORK(&urd->uevent_work, ur_uevent);  in urdev_alloc()
116 	spin_lock_init(&urd->open_lock);  in urdev_alloc()
117 	refcount_set(&urd->ref_count,  1);  in urdev_alloc()
118 	urd->cdev = cdev;  in urdev_alloc()
119 	get_device(&cdev->dev);  in urdev_alloc()
126 	if (urd->cdev)  in urdev_free()
127 		put_device(&urd->cdev->dev);  in urdev_free()
133 	refcount_inc(&urd->ref_count);  in urdev_get()
142 	urd = dev_get_drvdata(&cdev->dev);  in urdev_get_from_cdev()
160 	put_device(&cdev->dev);  in urdev_get_from_devno()
166 	if (refcount_dec_and_test(&urd->ref_count))  in urdev_put()
171  * Low-level functions to do I/O to a ur device.
181  * on a completion event it publishes at urd->io_done. The function
197 	while (ptr->cda) {  in free_chan_prog()
198 		kfree((void *)(addr_t) ptr->cda);  in free_chan_prog()
207  * with a final NOP CCW command-chained on (which ensures that CE and DE
222 	 * We chain a NOP onto the writes to force CE+DE together.  in alloc_chan_prog()
229 		return ERR_PTR(-ENOMEM);  in alloc_chan_prog()
238 			return ERR_PTR(-ENOMEM);  in alloc_chan_prog()
243 			return ERR_PTR(-EFAULT);  in alloc_chan_prog()
247 	/* The following NOP CCW forces CE+DE to be presented together */  in alloc_chan_prog()
255 	struct ccw_device *cdev = urd->cdev;  in do_ur_io()
260 	rc = mutex_lock_interruptible(&urd->io_mutex);  in do_ur_io()
264 	urd->io_done = &event;  in do_ur_io()
279 	mutex_unlock(&urd->io_mutex);  in do_ur_io()
287 		"EVENT=unsol_de",	/* Unsolicited device-end interrupt */  in ur_uevent()
291 	kobject_uevent_env(&urd->cdev->dev.kobj, KOBJ_CHANGE, envp);  in ur_uevent()
305 		      intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,  in ur_int_handler()
306 		      irb->scsw.cmd.count);  in ur_int_handler()
308 	urd = dev_get_drvdata(&cdev->dev);  in ur_int_handler()
312 		if (scsw_dstat(&irb->scsw) & DEV_STAT_DEV_END) {  in ur_int_handler()
315 			 * device-ready state.  in ur_int_handler()
318 			schedule_work(&urd->uevent_work);  in ur_int_handler()
325 		urd->io_request_rc = PTR_ERR(irb);  in ur_int_handler()
326 	else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))  in ur_int_handler()
327 		urd->io_request_rc = 0;  in ur_int_handler()
329 		urd->io_request_rc = -EIO;  in ur_int_handler()
331 	complete(urd->io_done);  in ur_int_handler()
335  * reclen sysfs attribute - The record length to be used for write CCWs
345 		return -ENODEV;  in ur_attr_reclen_show()
346 	rc = sprintf(buf, "%zu\n", urd->reclen);  in ur_attr_reclen_show()
364  * diagnose code 0x210 - retrieve device information
375 	ur_diag210.vrdcdvno = urd->dev_id.devno;  in get_urd_class()
381 		return -EOPNOTSUPP;  in get_urd_class()
385 		return -ENODEV;  in get_urd_class()
387 		return -EIO;  in get_urd_class()
401 	urf->urd = urd;  in urfile_alloc()
404 	      urf->dev_reclen);  in urfile_alloc()
411 	TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);  in urfile_free()
432 	if (urd->io_request_rc) {  in do_write()
433 		rc = urd->io_request_rc;  in do_write()
447 	struct urfile *urf = file->private_data;  in ur_write()
454 	if (count % urf->dev_reclen)  in ur_write()
455 		return -EINVAL;	/* count must be a multiple of reclen */  in ur_write()
457 	if (count > urf->dev_reclen * MAX_RECS_PER_IO)  in ur_write()
458 		count = urf->dev_reclen * MAX_RECS_PER_IO;  in ur_write()
460 	return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);  in ur_write()
464  * diagnose code 0x14 subcode 0x0028 - position spool file to designated
479 		return -ENOMEDIUM;  in diag_position_to_record()
481 		return -ENODATA; /* position beyond end of file */  in diag_position_to_record()
483 		return -EIO;  in diag_position_to_record()
488  * diagnose code 0x14 subcode 0x0000 - read next spool file buffer
504 		return -ENODATA;  in diag_read_file()
506 		return -ENOMEDIUM;  in diag_read_file()
508 		return -EIO;  in diag_read_file()
521 	urd = ((struct urfile *) file->private_data)->urd;  in diag14_read()
522 	reclen = ((struct urfile *) file->private_data)->file_reclen;  in diag14_read()
524 	rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1);  in diag14_read()
525 	if (rc == -ENODATA)  in diag14_read()
533 		return -ENOMEM;  in diag14_read()
538 		rc = diag_read_file(urd->dev_id.devno, buf);  in diag14_read()
539 		if (rc == -ENODATA) {  in diag14_read()
546 		len = min(count - copied, PAGE_SIZE - res);  in diag14_read()
548 			rc = -EFAULT;  in diag14_read()
573 	urd = ((struct urfile *) file->private_data)->urd;  in ur_read()
574 	rc = mutex_lock_interruptible(&urd->io_mutex);  in ur_read()
578 	mutex_unlock(&urd->io_mutex);  in ur_read()
583  * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor
597 		return -ENODATA;  in diag_read_next_file_info()
609 		return -ENOMEM;  in verify_uri_device()
617 	if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) {  in verify_uri_device()
618 		rc = -EPERM;  in verify_uri_device()
625 		rc = -ENOMEM;  in verify_uri_device()
628 	rc = diag_read_file(urd->dev_id.devno, buf);  in verify_uri_device()
629 	if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */  in verify_uri_device()
636 	if (!(fcb->file_stat & FLG_IN_USE)) {  in verify_uri_device()
637 		rc = -EMFILE;  in verify_uri_device()
651 	switch (urd->class) {  in verify_device()
657 		return -EOPNOTSUPP;  in verify_device()
668 		return -ENOMEM;  in get_uri_file_reclen()
672 	if (fcb->file_stat & FLG_CP_DUMP)  in get_uri_file_reclen()
675 		rc = fcb->rec_len;  in get_uri_file_reclen()
684 	switch (urd->class) {  in get_file_reclen()
690 		return -EOPNOTSUPP;  in get_file_reclen()
702 	accmode = file->f_flags & O_ACCMODE;  in ur_open()
705 		return -EACCES;  in ur_open()
714 		rc = -ENXIO;  in ur_open()
718 	spin_lock(&urd->open_lock);  in ur_open()
719 	while (urd->open_flag) {  in ur_open()
720 		spin_unlock(&urd->open_lock);  in ur_open()
721 		if (file->f_flags & O_NONBLOCK) {  in ur_open()
722 			rc = -EBUSY;  in ur_open()
725 		if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) {  in ur_open()
726 			rc = -ERESTARTSYS;  in ur_open()
729 		spin_lock(&urd->open_lock);  in ur_open()
731 	urd->open_flag++;  in ur_open()
732 	spin_unlock(&urd->open_lock);  in ur_open()
736 	if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) ||  in ur_open()
737 	    ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) {  in ur_open()
738 		TRACE("ur_open: unsupported dev class (%d)\n", urd->class);  in ur_open()
739 		rc = -EACCES;  in ur_open()
749 		rc = -ENOMEM;  in ur_open()
753 	urf->dev_reclen = urd->reclen;  in ur_open()
757 	urf->file_reclen = rc;  in ur_open()
758 	file->private_data = urf;  in ur_open()
764 	spin_lock(&urd->open_lock);  in ur_open()
765 	urd->open_flag--;  in ur_open()
766 	spin_unlock(&urd->open_lock);  in ur_open()
775 	struct urfile *urf = file->private_data;  in ur_release()
778 	spin_lock(&urf->urd->open_lock);  in ur_release()
779 	urf->urd->open_flag--;  in ur_release()
780 	spin_unlock(&urf->urd->open_lock);  in ur_release()
781 	wake_up_interruptible(&urf->urd->wait);  in ur_release()
782 	urdev_put(urf->urd);  in ur_release()
789 	if ((file->f_flags & O_ACCMODE) != O_RDONLY)  in ur_llseek()
790 		return -ESPIPE; /* seek allowed only for reader */  in ur_llseek()
792 		return -ESPIPE; /* only multiples of 4K allowed */  in ur_llseek()
813  *     ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized
816  *     urd->char_device is used as indication that the online function has
829 		rc = -ENOMEM;  in ur_probe()
833 	rc = ur_create_attributes(&cdev->dev);  in ur_probe()
835 		rc = -ENOMEM;  in ur_probe()
840 	urd->class = get_urd_class(urd);  in ur_probe()
841 	if (urd->class < 0) {  in ur_probe()
842 		rc = urd->class;  in ur_probe()
845 	if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {  in ur_probe()
846 		rc = -EOPNOTSUPP;  in ur_probe()
850 	dev_set_drvdata(&cdev->dev, urd);  in ur_probe()
851 	cdev->handler = ur_int_handler;  in ur_probe()
858 	ur_remove_attributes(&cdev->dev);  in ur_probe()
878 		rc = -ENODEV;  in ur_set_online()
882 	if (urd->char_device) {  in ur_set_online()
884 		rc = -EBUSY;  in ur_set_online()
888 	minor = urd->dev_id.devno;  in ur_set_online()
891 	urd->char_device = cdev_alloc();  in ur_set_online()
892 	if (!urd->char_device) {  in ur_set_online()
893 		rc = -ENOMEM;  in ur_set_online()
897 	urd->char_device->ops = &ur_fops;  in ur_set_online()
898 	urd->char_device->owner = ur_fops.owner;  in ur_set_online()
900 	rc = cdev_add(urd->char_device, MKDEV(major, minor), 1);  in ur_set_online()
903 	if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) {  in ur_set_online()
904 		if (urd->class == DEV_CLASS_UR_I)  in ur_set_online()
905 			sprintf(node_id, "vmrdr-%s", dev_name(&cdev->dev));  in ur_set_online()
906 		if (urd->class == DEV_CLASS_UR_O)  in ur_set_online()
907 			sprintf(node_id, "vmpun-%s", dev_name(&cdev->dev));  in ur_set_online()
908 	} else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) {  in ur_set_online()
909 		sprintf(node_id, "vmprt-%s", dev_name(&cdev->dev));  in ur_set_online()
911 		rc = -EOPNOTSUPP;  in ur_set_online()
915 	urd->device = device_create(vmur_class, &cdev->dev,  in ur_set_online()
916 				    urd->char_device->dev, NULL, "%s", node_id);  in ur_set_online()
917 	if (IS_ERR(urd->device)) {  in ur_set_online()
918 		rc = PTR_ERR(urd->device);  in ur_set_online()
927 	cdev_del(urd->char_device);  in ur_set_online()
928 	urd->char_device = NULL;  in ur_set_online()
945 		return -ENODEV;  in ur_set_offline_force()
946 	if (!urd->char_device) {  in ur_set_offline_force()
948 		rc = -EBUSY;  in ur_set_offline_force()
951 	if (!force && (refcount_read(&urd->ref_count) > 2)) {  in ur_set_offline_force()
954 		rc = -EBUSY;  in ur_set_offline_force()
957 	if (cancel_work_sync(&urd->uevent_work)) {  in ur_set_offline_force()
958 		/* Work not run yet - need to release reference here */  in ur_set_offline_force()
961 	device_destroy(vmur_class, urd->char_device->dev);  in ur_set_offline_force()
962 	cdev_del(urd->char_device);  in ur_set_offline_force()
963 	urd->char_device = NULL;  in ur_set_offline_force()
989 	if (cdev->online)  in ur_remove()
991 	ur_remove_attributes(&cdev->dev);  in ur_remove()
994 	urdev_put(dev_get_drvdata(&cdev->dev));  in ur_remove()
995 	dev_set_drvdata(&cdev->dev, NULL);  in ur_remove()
996 	cdev->handler = NULL;  in ur_remove()
1013 		return -ENODEV;  in ur_init()
1018 		return -ENOMEM;  in ur_init()