text: // SPDX-License-Identifier: GPL-2.0
  /*
   *    tape device discipline for 3590 tapes.
   *
   *    Copyright IBM Corp. 2001, 2009
   *    Author(s): Stefan Bader <shbader@de.ibm.com>
   *		 Michael Holzheu <holzheu@de.ibm.com>
   *		 Martin Schwidefsky <schwidefsky@de.ibm.com>
   */
  
  #define KMSG_COMPONENT "tape_3590"
  #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/init.h>
  #include <linux/bio.h>
  #include <asm/ebcdic.h>
  
  #define TAPE_DBF_AREA	tape_3590_dbf
  #define BUFSIZE 512	/* size of buffers for dynamic generated messages */
  
  #include "tape.h"
  #include "tape_std.h"
  #include "tape_3590.h"
  
  static struct workqueue_struct *tape_3590_wq;
  
  /*
   * Pointer to debug area.
   */
  debug_info_t *TAPE_DBF_AREA = NULL;
  EXPORT_SYMBOL(TAPE_DBF_AREA);
  
  /*******************************************************************
   * Error Recovery functions:
   * - Read Opposite:		 implemented
   * - Read Device (buffered) log: BRA
   * - Read Library log:		 BRA
   * - Swap Devices:		 BRA
   * - Long Busy:			 implemented
   * - Special Intercept:		 BRA
   * - Read Alternate:		 implemented
   *******************************************************************/
  
  static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
  	[0x00] = "",
  	[0x10] = "Lost Sense",
  	[0x11] = "Assigned Elsewhere",
  	[0x12] = "Allegiance Reset",
  	[0x13] = "Shared Access Violation",
  	[0x20] = "Command Reject",
  	[0x21] = "Configuration Error",
  	[0x22] = "Protection Exception",
  	[0x23] = "Write Protect",
  	[0x24] = "Write Length",
  	[0x25] = "Read-Only Format",
  	[0x31] = "Beginning of Partition",
  	[0x33] = "End of Partition",
  	[0x34] = "End of Data",
  	[0x35] = "Block not found",
  	[0x40] = "Device Intervention",
  	[0x41] = "Loader Intervention",
  	[0x42] = "Library Intervention",
  	[0x50] = "Write Error",
  	[0x51] = "Erase Error",
  	[0x52] = "Formatting Error",
  	[0x53] = "Read Error",
  	[0x54] = "Unsupported Format",
  	[0x55] = "No Formatting",
  	[0x56] = "Positioning lost",
  	[0x57] = "Read Length",
  	[0x60] = "Unsupported Medium",
  	[0x61] = "Medium Length Error",
  	[0x62] = "Medium removed",
  	[0x64] = "Load Check",
  	[0x65] = "Unload Check",
  	[0x70] = "Equipment Check",
  	[0x71] = "Bus out Check",
  	[0x72] = "Protocol Error",
  	[0x73] = "Interface Error",
  	[0x74] = "Overrun",
  	[0x75] = "Halt Signal",
  	[0x90] = "Device fenced",
  	[0x91] = "Device Path fenced",
  	[0xa0] = "Volume misplaced",
  	[0xa1] = "Volume inaccessible",
  	[0xa2] = "Volume in input",
  	[0xa3] = "Volume ejected",
  	[0xa4] = "All categories reserved",
  	[0xa5] = "Duplicate Volume",
  	[0xa6] = "Library Manager Offline",
  	[0xa7] = "Library Output Station full",
  	[0xa8] = "Vision System non-operational",
  	[0xa9] = "Library Manager Equipment Check",
  	[0xaa] = "Library Equipment Check",
  	[0xab] = "All Library Cells full",
  	[0xac] = "No Cleaner Volumes in Library",
  	[0xad] = "I/O Station door open",
  	[0xae] = "Subsystem environmental alert",
  };
  
  static int crypt_supported(struct tape_device *device)
  {
  	return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
  }
  
  static int crypt_enabled(struct tape_device *device)
  {
  	return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
  }
  
  static void ext_to_int_kekl(struct tape390_kekl *in,
  			    struct tape3592_kekl *out)
  {
  	int len;
  
  	memset(out, 0, sizeof(*out));
  	if (in->type == TAPE390_KEKL_TYPE_HASH)
  		out->flags |= 0x40;
  	if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
  		out->flags |= 0x80;
  	len = min(sizeof(out->label), strlen(in->label));
  	memcpy(out->label, in->label, len);
  	memset(out->label + len, ' ', sizeof(out->label) - len);
  	ASCEBC(out->label, sizeof(out->label));
  }
  
  static void int_to_ext_kekl(struct tape3592_kekl *in,
  			    struct tape390_kekl *out)
  {
  	memset(out, 0, sizeof(*out));
  	if(in->flags & 0x40)
  		out->type = TAPE390_KEKL_TYPE_HASH;
  	else
  		out->type = TAPE390_KEKL_TYPE_LABEL;
  	if(in->flags & 0x80)
  		out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
  	else
  		out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
  	memcpy(out->label, in->label, sizeof(in->label));
  	EBCASC(out->label, sizeof(in->label));
  	strim(out->label);
  }
  
  static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
  				 struct tape390_kekl_pair *out)
  {
  	if (in->count == 0) {
  		out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
  		out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
  		out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
  		out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
  	} else if (in->count == 1) {
  		int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
  		out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
  		out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
  	} else if (in->count == 2) {
  		int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
  		int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
  	} else {
  		printk("Invalid KEKL number: %d\n", in->count);
  		BUG();
  	}
  }
  
  static int check_ext_kekl(struct tape390_kekl *kekl)
  {
  	if (kekl->type == TAPE390_KEKL_TYPE_NONE)
  		goto invalid;
  	if (kekl->type > TAPE390_KEKL_TYPE_HASH)
  		goto invalid;
  	if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
  		goto invalid;
  	if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
  		goto invalid;
  	if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
  	    (kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
  		goto invalid;
  
  	return 0;
  invalid:
  	return -EINVAL;
  }
  
  static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
  {
  	if (check_ext_kekl(&kekls->kekl[0]))
  		goto invalid;
  	if (check_ext_kekl(&kekls->kekl[1]))
  		goto invalid;
  
  	return 0;
  invalid:
  	return -EINVAL;
  }
  
  /*
   * Query KEKLs
   */
  static int tape_3592_kekl_query(struct tape_device *device,
  				struct tape390_kekl_pair *ext_kekls)
  {
  	struct tape_request *request;
  	struct tape3592_kekl_query_order *order;
  	struct tape3592_kekl_query_data *int_kekls;
  	int rc;
  
  	DBF_EVENT(6, "tape3592_kekl_query\n");
  	int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
  	if (!int_kekls)
  		return -ENOMEM;
  	request = tape_alloc_request(2, sizeof(*order));
  	if (IS_ERR(request)) {
  		rc = PTR_ERR(request);
  		goto fail_malloc;
  	}
  	order = request->cpdata;
  	memset(order,0,sizeof(*order));
  	order->code = 0xe2;
  	order->max_count = 2;
  	request->op = TO_KEKL_QUERY;
  	tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
  	tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
  		     int_kekls);
  	rc = tape_do_io(device, request);
  	if (rc)
  		goto fail_request;
  	int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
  
  	rc = 0;
  fail_request:
  	tape_free_request(request);
  fail_malloc:
  	kfree(int_kekls);
  	return rc;
  }
  
  /*
   * IOCTL: Query KEKLs
   */
  static int tape_3592_ioctl_kekl_query(struct tape_device *device,
  				      unsigned long arg)
  {
  	int rc;
  	struct tape390_kekl_pair *ext_kekls;
  
  	DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
  	if (!crypt_supported(device))
  		return -ENOSYS;
  	if (!crypt_enabled(device))
  		return -EUNATCH;
  	ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
  	if (!ext_kekls)
  		return -ENOMEM;
  	rc = tape_3592_kekl_query(device, ext_kekls);
  	if (rc != 0)
  		goto fail;
  	if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
  		rc = -EFAULT;
  		goto fail;
  	}
  	rc = 0;
  fail:
  	kfree(ext_kekls);
  	return rc;
  }
  
  static int tape_3590_mttell(struct tape_device *device, int mt_count);
  
  /*
   * Set KEKLs
   */
  static int tape_3592_kekl_set(struct tape_device *device,
  			      struct tape390_kekl_pair *ext_kekls)
  {
  	struct tape_request *request;
  	struct tape3592_kekl_set_order *order;
  
  	DBF_EVENT(6, "tape3592_kekl_set\n");
  	if (check_ext_kekl_pair(ext_kekls)) {
  		DBF_EVENT(6, "invalid kekls\n");
  		return -EINVAL;
  	}
  	if (tape_3590_mttell(device, 0) != 0)
  		return -EBADSLT;
  	request = tape_alloc_request(1, sizeof(*order));
  	if (IS_ERR(request))
  		return PTR_ERR(request);
  	order = request->cpdata;
  	memset(order, 0, sizeof(*order));
  	order->code = 0xe3;
  	order->kekls.count = 2;
  	ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
  	ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
  	request->op = TO_KEKL_SET;
  	tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
  
  	return tape_do_io_free(device, request);
  }
  
  /*
   * IOCTL: Set KEKLs
   */
  static int tape_3592_ioctl_kekl_set(struct tape_device *device,
  				    unsigned long arg)
  {
  	int rc;
  	struct tape390_kekl_pair *ext_kekls;
  
  	DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
  	if (!crypt_supported(device))
  		return -ENOSYS;
  	if (!crypt_enabled(device))
  		return -EUNATCH;
  	ext_kekls = memdup_user((char __user *)arg, sizeof(*ext_kekls));
  	if (IS_ERR(ext_kekls))
  		return PTR_ERR(ext_kekls);
  	rc = tape_3592_kekl_set(device, ext_kekls);
  	kfree(ext_kekls);
  	return rc;
  }
  
  /*
   * Enable encryption
   */
  static struct tape_request *__tape_3592_enable_crypt(struct tape_device *device)
  {
  	struct tape_request *request;
  	char *data;
  
  	DBF_EVENT(6, "tape_3592_enable_crypt\n");
  	if (!crypt_supported(device))
  		return ERR_PTR(-ENOSYS);
  	request = tape_alloc_request(2, 72);
  	if (IS_ERR(request))
  		return request;
  	data = request->cpdata;
  	memset(data,0,72);
  
  	data[0]       = 0x05;
  	data[36 + 0]  = 0x03;
  	data[36 + 1]  = 0x03;
  	data[36 + 4]  = 0x40;
  	data[36 + 6]  = 0x01;
  	data[36 + 14] = 0x2f;
  	data[36 + 18] = 0xc3;
  	data[36 + 35] = 0x72;
  	request->op = TO_CRYPT_ON;
  	tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
  	tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
  	return request;
  }
  
  static int tape_3592_enable_crypt(struct tape_device *device)
  {
  	struct tape_request *request;
  
  	request = __tape_3592_enable_crypt(device);
  	if (IS_ERR(request))
  		return PTR_ERR(request);
  	return tape_do_io_free(device, request);
  }
  
  static void tape_3592_enable_crypt_async(struct tape_device *device)
  {
  	struct tape_request *request;
  
  	request = __tape_3592_enable_crypt(device);
  	if (!IS_ERR(request))
  		tape_do_io_async_free(device, request);
  }
  
  /*
   * Disable encryption
   */
  static struct tape_request *__tape_3592_disable_crypt(struct tape_device *device)
  {
  	struct tape_request *request;
  	char *data;
  
  	DBF_EVENT(6, "tape_3592_disable_crypt\n");
  	if (!crypt_supported(device))
  		return ERR_PTR(-ENOSYS);
  	request = tape_alloc_request(2, 72);
  	if (IS_ERR(request))
  		return request;
  	data = request->cpdata;
  	memset(data,0,72);
  
  	data[0]       = 0x05;
  	data[36 + 0]  = 0x03;
  	data[36 + 1]  = 0x03;
  	data[36 + 35] = 0x32;
  
  	request->op = TO_CRYPT_OFF;
  	tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
  	tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
  
  	return request;
  }
  
  static int tape_3592_disable_crypt(struct tape_device *device)
  {
  	struct tape_request *request;
  
  	request = __tape_3592_disable_crypt(device);
  	if (IS_ERR(request))
  		return PTR_ERR(request);
  	return tape_do_io_free(device, request);
  }
  
  static void tape_3592_disable_crypt_async(struct tape_device *device)
  {
  	struct tape_request *request;
  
  	request = __tape_3592_disable_crypt(device);
  	if (!IS_ERR(request))
  		tape_do_io_async_free(device, request);
  }
  
  /*
   * IOCTL: Set encryption status
   */
  static int tape_3592_ioctl_crypt_set(struct tape_device *device,
  				     unsigned long arg)
  {
  	struct tape390_crypt_info info;
  
  	DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
  	if (!crypt_supported(device))
  		return -ENOSYS;
  	if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
  		return -EFAULT;
  	if (info.status & ~TAPE390_CRYPT_ON_MASK)
  		return -EINVAL;
  	if (info.status & TAPE390_CRYPT_ON_MASK)
  		return tape_3592_enable_crypt(device);
  	else
  		return tape_3592_disable_crypt(device);
  }
  
  static int tape_3590_sense_medium(struct tape_device *device);
  
  /*
   * IOCTL: Query enryption status
   */
  static int tape_3592_ioctl_crypt_query(struct tape_device *device,
  				       unsigned long arg)
  {
  	DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
  	if (!crypt_supported(device))
  		return -ENOSYS;
  	tape_3590_sense_medium(device);
  	if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
  		sizeof(TAPE_3590_CRYPT_INFO(device))))
  		return -EFAULT;
  	else
  		return 0;
  }
  
  /*
   * 3590 IOCTL Overload
   */
  static int
  tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
  {
  	switch (cmd) {
  	case TAPE390_DISPLAY: {
  		struct display_struct disp;
  
  		if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)))
  			return -EFAULT;
  
  		return tape_std_display(device, &disp);
  	}
  	case TAPE390_KEKL_SET:
  		return tape_3592_ioctl_kekl_set(device, arg);
  	case TAPE390_KEKL_QUERY:
  		return tape_3592_ioctl_kekl_query(device, arg);
  	case TAPE390_CRYPT_SET:
  		return tape_3592_ioctl_crypt_set(device, arg);
  	case TAPE390_CRYPT_QUERY:
  		return tape_3592_ioctl_crypt_query(device, arg);
  	default:
  		return -EINVAL;	/* no additional ioctls */
  	}
  }
  
  /*
   * SENSE Medium: Get Sense data about medium state
   */
  static int tape_3590_sense_medium(struct tape_device *device)
  {
  	struct tape_request *request;
  
  	request = tape_alloc_request(1, 128);
  	if (IS_ERR(request))
  		return PTR_ERR(request);
  	request->op = TO_MSEN;
  	tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
  	return tape_do_io_free(device, request);
  }
  
  static void tape_3590_sense_medium_async(struct tape_device *device)
  {
  	struct tape_request *request;
  
  	request = tape_alloc_request(1, 128);
  	if (IS_ERR(request))
  		return;
  	request->op = TO_MSEN;
  	tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
  	tape_do_io_async_free(device, request);
  }
  
  /*
   * MTTELL: Tell block. Return the number of block relative to current file.
   */
  static int
  tape_3590_mttell(struct tape_device *device, int mt_count)
  {
  	__u64 block_id;
  	int rc;
  
  	rc = tape_std_read_block_id(device, &block_id);
  	if (rc)
  		return rc;
  	return block_id >> 32;
  }
  
  /*
   * MTSEEK: seek to the specified block.
   */
  static int
  tape_3590_mtseek(struct tape_device *device, int count)
  {
  	struct tape_request *request;
  
  	DBF_EVENT(6, "xsee id: %x\n", count);
  	request = tape_alloc_request(3, 4);
  	if (IS_ERR(request))
  		return PTR_ERR(request);
  	request->op = TO_LBL;
  	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
  	*(__u32 *) request->cpdata = count;
  	tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
  	tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
  	return tape_do_io_free(device, request);
  }
  
  /*
   * Read Opposite Error Recovery Function:
   * Used, when Read Forward does not work
   */
  static void
  tape_3590_read_opposite(struct tape_device *device,
  			struct tape_request *request)
  {
  	struct tape_3590_disc_data *data;
  
  	/*
  	 * We have allocated 4 ccws in tape_std_read, so we can now
  	 * transform the request to a read backward, followed by a
  	 * forward space block.
  	 */
  	request->op = TO_RBA;
  	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
  	data = device->discdata;
  	tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op,
  			 device->char_data.idal_buf);
  	tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
  	tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
  	DBF_EVENT(6, "xrop ccwg\n");
  }
  
  /*
   * Read Attention Msg
   * This should be done after an interrupt with attention bit (0x80)
   * in device state.
   *
   * After a "read attention message" request there are two possible
   * results:
   *
   * 1. A unit check is presented, when attention sense is present (e.g. when
   * a medium has been unloaded). The attention sense comes then
   * together with the unit check. The recovery action is either "retry"
   * (in case there is an attention message pending) or "permanent error".
   *
   * 2. The attention msg is written to the "read subsystem data" buffer.
   * In this case we probably should print it to the console.
   */
  static void tape_3590_read_attmsg_async(struct tape_device *device)
  {
  	struct tape_request *request;
  	char *buf;
  
  	request = tape_alloc_request(3, 4096);
  	if (IS_ERR(request))
  		return;
  	request->op = TO_READ_ATTMSG;
  	buf = request->cpdata;
  	buf[0] = PREP_RD_SS_DATA;
  	buf[6] = RD_ATTMSG;	/* read att msg */
  	tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf);
  	tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12);
  	tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
  	tape_do_io_async_free(device, request);
  }
  
  /*
   * These functions are used to schedule follow-up actions from within an
   * interrupt context (like unsolicited interrupts).
   * Note: the work handler is called by the system work queue. The tape
   * commands started by the handler need to be asynchrounous, otherwise
   * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq).
   */
  struct work_handler_data {
  	struct tape_device *device;
  	enum tape_op        op;
  	struct work_struct  work;
  };
  
  static void
  tape_3590_work_handler(struct work_struct *work)
  {
  	struct work_handler_data *p =
  		container_of(work, struct work_handler_data, work);
  
  	switch (p->op) {
  	case TO_MSEN:
  		tape_3590_sense_medium_async(p->device);
  		break;
  	case TO_READ_ATTMSG:
  		tape_3590_read_attmsg_async(p->device);
  		break;
  	case TO_CRYPT_ON:
  		tape_3592_enable_crypt_async(p->device);
  		break;
  	case TO_CRYPT_OFF:
  		tape_3592_disable_crypt_async(p->device);
  		break;
  	default:
  		DBF_EVENT(3, "T3590: work handler undefined for "
  			  "operation 0x%02x\n", p->op);
  	}
  	tape_put_device(p->device);
  	kfree(p);
  }
  
  static int
  tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
  {
  	struct work_handler_data *p;
  
  	if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
  		return -ENOMEM;
  
  	INIT_WORK(&p->work, tape_3590_work_handler);
  
  	p->device = tape_get_device(device);
  	p->op = op;
  
  	queue_work(tape_3590_wq, &p->work);
  	return 0;
  }
  
  static void tape_3590_med_state_set(struct tape_device *device,
  				    struct tape_3590_med_sense *sense)
  {
  	struct tape390_crypt_info *c_info;
  
  	c_info = &TAPE_3590_CRYPT_INFO(device);
  
  	DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst);
  	switch (sense->macst) {
  	case 0x04:
  	case 0x05:
  	case 0x06:
  		tape_med_state_set(device, MS_UNLOADED);
  		TAPE_3590_CRYPT_INFO(device).medium_status = 0;
  		return;
  	case 0x08:
  	case 0x09:
  		tape_med_state_set(device, MS_LOADED);
  		break;
  	default:
  		tape_med_state_set(device, MS_UNKNOWN);
  		return;
  	}
  	c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
  	if (sense->flags & MSENSE_CRYPT_MASK) {
  		DBF_EVENT(6, "Medium is encrypted (%04x)\n", sense->flags);
  		c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
  	} else	{
  		DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
  		c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
  	}
  }
  
  /*
   * The done handler is called at device/channel end and wakes up the sleeping
   * process
   */
  static int
  tape_3590_done(struct tape_device *device, struct tape_request *request)
  {
  
  	DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
  
  	switch (request->op) {
  	case TO_BSB:
  	case TO_BSF:
  	case TO_DSE:
  	case TO_FSB:
  	case TO_FSF:
  	case TO_LBL:
  	case TO_RFO:
  	case TO_RBA:
  	case TO_REW:
  	case TO_WRI:
  	case TO_WTM:
  	case TO_BLOCK:
  	case TO_LOAD:
  		tape_med_state_set(device, MS_LOADED);
  		break;
  	case TO_RUN:
  		tape_med_state_set(device, MS_UNLOADED);
  		tape_3590_schedule_work(device, TO_CRYPT_OFF);
  		break;
  	case TO_MSEN:
  		tape_3590_med_state_set(device, request->cpdata);
  		break;
  	case TO_CRYPT_ON:
  		TAPE_3590_CRYPT_INFO(device).status
  			|= TAPE390_CRYPT_ON_MASK;
  		*(device->modeset_byte) |= 0x03;
  		break;
  	case TO_CRYPT_OFF:
  		TAPE_3590_CRYPT_INFO(device).status
  			&= ~TAPE390_CRYPT_ON_MASK;
  		*(device->modeset_byte) &= ~0x03;
  		break;
  	case TO_RBI:	/* RBI seems to succeed even without medium loaded. */
  	case TO_NOP:	/* Same to NOP. */
  	case TO_READ_CONFIG:
  	case TO_READ_ATTMSG:
  	case TO_DIS:
  	case TO_ASSIGN:
  	case TO_UNASSIGN:
  	case TO_SIZE:
  	case TO_KEKL_SET:
  	case TO_KEKL_QUERY:
  	case TO_RDC:
  		break;
  	}
  	return TAPE_IO_SUCCESS;
  }
  
  /*
   * This function is called, when error recovery was successful
   */
  static inline int
  tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
  {
  	DBF_EVENT(3, "Error Recovery successful for %s\n",
  		  tape_op_verbose[request->op]);
  	return tape_3590_done(device, request);
  }
  
  /*
   * This function is called, when error recovery was not successful
   */
  static inline int
  tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
  		     struct irb *irb, int rc)
  {
  	DBF_EVENT(3, "Error Recovery failed for %s\n",
  		  tape_op_verbose[request->op]);
  	tape_dump_sense_dbf(device, request, irb);
  	return rc;
  }
  
  /*
   * Error Recovery do retry
   */
  static inline int
  tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
  		    struct irb *irb)
  {
  	DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
  	tape_dump_sense_dbf(device, request, irb);
  	return TAPE_IO_RETRY;
  }
  
  /*
   * Handle unsolicited interrupts
   */
  static int
  tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
  {
  	if (irb->scsw.cmd.dstat == DEV_STAT_CHN_END)
  		/* Probably result of halt ssch */
  		return TAPE_IO_PENDING;
  	else if (irb->scsw.cmd.dstat == 0x85)
  		/* Device Ready */
  		DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id);
  	else if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
  		tape_3590_schedule_work(device, TO_READ_ATTMSG);
  	} else {
  		DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
  		tape_dump_sense_dbf(device, NULL, irb);
  	}
  	/* check medium state */
  	tape_3590_schedule_work(device, TO_MSEN);
  	return TAPE_IO_SUCCESS;
  }
  
  /*
   * Basic Recovery routine
   */
  static int
  tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
  		    struct irb *irb, int rc)
  {
  	struct tape_3590_sense *sense;
  
  	sense = (struct tape_3590_sense *) irb->ecw;
  
  	switch (sense->bra) {
  	case SENSE_BRA_PER:
  		return tape_3590_erp_failed(device, request, irb, rc);
  	case SENSE_BRA_CONT:
  		return tape_3590_erp_succeded(device, request);
  	case SENSE_BRA_RE:
  		return tape_3590_erp_retry(device, request, irb);
  	case SENSE_BRA_DRE:
  		return tape_3590_erp_failed(device, request, irb, rc);
  	default:
  		BUG();
  		return TAPE_IO_STOP;
  	}
  }
  
  /*
   *  RDL: Read Device (buffered) log
   */
  static int
  tape_3590_erp_read_buf_log(struct tape_device *device,
  			   struct tape_request *request, struct irb *irb)
  {
  	/*
  	 * We just do the basic error recovery at the moment (retry).
  	 * Perhaps in the future, we read the log and dump it somewhere...
  	 */
  	return tape_3590_erp_basic(device, request, irb, -EIO);
  }
  
  /*
   *  SWAP: Swap Devices
   */
  static int
  tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
  		   struct irb *irb)
  {
  	/*
  	 * This error recovery should swap the tapes
  	 * if the original has a problem. The operation
  	 * should proceed with the new tape... this
  	 * should probably be done in user space!
  	 */
  	dev_warn (&device->cdev->dev, "The tape medium must be loaded into a "
  		"different tape unit\n");
  	return tape_3590_erp_basic(device, request, irb, -EIO);
  }
  
  /*
   *  LBY: Long Busy
   */
  static int
  tape_3590_erp_long_busy(struct tape_device *device,
  			struct tape_request *request, struct irb *irb)
  {
  	DBF_EVENT(6, "Device is busy\n");
  	return TAPE_IO_LONG_BUSY;
  }
  
  /*
   *  SPI: Special Intercept
   */
  static int
  tape_3590_erp_special_interrupt(struct tape_device *device,
  				struct tape_request *request, struct irb *irb)
  {
  	return tape_3590_erp_basic(device, request, irb, -EIO);
  }
  
  /*
   *  RDA: Read Alternate
   */
  static int
  tape_3590_erp_read_alternate(struct tape_device *device,
  			     struct tape_request *request, struct irb *irb)
  {
  	struct tape_3590_disc_data *data;
  
  	/*
  	 * The issued Read Backward or Read Previous command is not
  	 * supported by the device
  	 * The recovery action should be to issue another command:
  	 * Read Revious: if Read Backward is not supported
  	 * Read Backward: if Read Previous is not supported
  	 */
  	data = device->discdata;
  	if (data->read_back_op == READ_PREVIOUS) {
  		DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
  			  device->cdev_id);
  		data->read_back_op = READ_BACKWARD;
  	} else {
  		DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
  			  device->cdev_id);
  		data->read_back_op = READ_PREVIOUS;
  	}
  	tape_3590_read_opposite(device, request);
  	return tape_3590_erp_retry(device, request, irb);
  }
  
  /*
   * Error Recovery read opposite
   */
  static int
  tape_3590_erp_read_opposite(struct tape_device *device,
  			    struct tape_request *request, struct irb *irb)
  {
  	switch (request->op) {
  	case TO_RFO:
  		/*
  		 * We did read forward, but the data could not be read.
  		 * We will read backward and then skip forward again.
  		 */
  		tape_3590_read_opposite(device, request);
  		return tape_3590_erp_retry(device, request, irb);
  	case TO_RBA:
  		/* We tried to read forward and backward, but hat no success */
  		return tape_3590_erp_failed(device, request, irb, -EIO);
  		break;
  	default:
  		return tape_3590_erp_failed(device, request, irb, -EIO);
  	}
  }
  
  /*
   * Print an MIM (Media Information  Message) (message code f0)
   */
  static void
  tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
  {
  	struct tape_3590_sense *sense;
  	char *exception, *service;
  
  	exception = kmalloc(BUFSIZE, GFP_ATOMIC);
  	service = kmalloc(BUFSIZE, GFP_ATOMIC);
  
  	if (!exception || !service)
  		goto out_nomem;
  
  	sense = (struct tape_3590_sense *) irb->ecw;
  	/* Exception Message */
  	switch (sense->fmt.f70.emc) {
  	case 0x02:
  		snprintf(exception, BUFSIZE, "Data degraded");
  		break;
  	case 0x03:
  		snprintf(exception, BUFSIZE, "Data degraded in partion %i",
  			sense->fmt.f70.mp);
  		break;
  	case 0x04:
  		snprintf(exception, BUFSIZE, "Medium degraded");
  		break;
  	case 0x05:
  		snprintf(exception, BUFSIZE, "Medium degraded in partition %i",
  			sense->fmt.f70.mp);
  		break;
  	case 0x06:
  		snprintf(exception, BUFSIZE, "Block 0 Error");
  		break;
  	case 0x07:
  		snprintf(exception, BUFSIZE, "Medium Exception 0x%02x",
  			sense->fmt.f70.md);
  		break;
  	default:
  		snprintf(exception, BUFSIZE, "0x%02x",
  			sense->fmt.f70.emc);
  		break;
  	}
  	/* Service Message */
  	switch (sense->fmt.f70.smc) {
  	case 0x02:
  		snprintf(service, BUFSIZE, "Reference Media maintenance "
  			"procedure %i", sense->fmt.f70.md);
  		break;
  	default:
  		snprintf(service, BUFSIZE, "0x%02x",
  			sense->fmt.f70.smc);
  		break;
  	}
  
  	dev_warn (&device->cdev->dev, "Tape media information: exception %s, "
  		"service %s\n", exception, service);
  
  out_nomem:
  	kfree(exception);
  	kfree(service);
  }
  
  /*
   * Print an I/O Subsystem Service Information Message (message code f1)
   */
  static void
  tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb)
  {
  	struct tape_3590_sense *sense;
  	char *exception, *service;
  
  	exception = kmalloc(BUFSIZE, GFP_ATOMIC);
  	service = kmalloc(BUFSIZE, GFP_ATOMIC);
  
  	if (!exception || !service)
  		goto out_nomem;
  
  	sense = (struct tape_3590_sense *) irb->ecw;
  	/* Exception Message */
  	switch (sense->fmt.f71.emc) {
  	case 0x01:
  		snprintf(exception, BUFSIZE, "Effect of failure is unknown");
  		break;
  	case 0x02:
  		snprintf(exception, BUFSIZE, "CU Exception - no performance "
  			"impact");
  		break;
  	case 0x03:
  		snprintf(exception, BUFSIZE, "CU Exception on channel "
  			"interface 0x%02x", sense->fmt.f71.md[0]);
  		break;
  	case 0x04:
  		snprintf(exception, BUFSIZE, "CU Exception on device path "
  			"0x%02x", sense->fmt.f71.md[0]);
  		break;
  	case 0x05:
  		snprintf(exception, BUFSIZE, "CU Exception on library path "
  			"0x%02x", sense->fmt.f71.md[0]);
  		break;
  	case 0x06:
  		snprintf(exception, BUFSIZE, "CU Exception on node 0x%02x",
  			sense->fmt.f71.md[0]);
  		break;
  	case 0x07:
  		snprintf(exception, BUFSIZE, "CU Exception on partition "
  			"0x%02x", sense->fmt.f71.md[0]);
  		break;
  	default:
  		snprintf(exception, BUFSIZE, "0x%02x",
  			sense->fmt.f71.emc);
  	}
  	/* Service Message */
  	switch (sense->fmt.f71.smc) {
  	case 0x01:
  		snprintf(service, BUFSIZE, "Repair impact is unknown");
  		break;
  	case 0x02:
  		snprintf(service, BUFSIZE, "Repair will not impact cu "
  			"performance");
  		break;
  	case 0x03:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable node "
  				"0x%x on CU", sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"nodes (0x%x-0x%x) on CU", sense->fmt.f71.md[1],
  				sense->fmt.f71.md[2]);
  		break;
  	case 0x04:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"channel path 0x%x on CU",
  				sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable channel"
  				" paths (0x%x-0x%x) on CU",
  				sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x05:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable device"
  				" path 0x%x on CU", sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable device"
  				" paths (0x%x-0x%x) on CU",
  				sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x06:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"library path 0x%x on CU",
  				sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"library paths (0x%x-0x%x) on CU",
  				sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x07:
  		snprintf(service, BUFSIZE, "Repair will disable access to CU");
  		break;
  	default:
  		snprintf(service, BUFSIZE, "0x%02x",
  			sense->fmt.f71.smc);
  	}
  
  	dev_warn (&device->cdev->dev, "I/O subsystem information: exception"
  		" %s, service %s\n", exception, service);
  out_nomem:
  	kfree(exception);
  	kfree(service);
  }
  
  /*
   * Print an Device Subsystem Service Information Message (message code f2)
   */
  static void
  tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb)
  {
  	struct tape_3590_sense *sense;
  	char *exception, *service;
  
  	exception = kmalloc(BUFSIZE, GFP_ATOMIC);
  	service = kmalloc(BUFSIZE, GFP_ATOMIC);
  
  	if (!exception || !service)
  		goto out_nomem;
  
  	sense = (struct tape_3590_sense *) irb->ecw;
  	/* Exception Message */
  	switch (sense->fmt.f71.emc) {
  	case 0x01:
  		snprintf(exception, BUFSIZE, "Effect of failure is unknown");
  		break;
  	case 0x02:
  		snprintf(exception, BUFSIZE, "DV Exception - no performance"
  			" impact");
  		break;
  	case 0x03:
  		snprintf(exception, BUFSIZE, "DV Exception on channel "
  			"interface 0x%02x", sense->fmt.f71.md[0]);
  		break;
  	case 0x04:
  		snprintf(exception, BUFSIZE, "DV Exception on loader 0x%02x",
  			sense->fmt.f71.md[0]);
  		break;
  	case 0x05:
  		snprintf(exception, BUFSIZE, "DV Exception on message display"
  			" 0x%02x", sense->fmt.f71.md[0]);
  		break;
  	case 0x06:
  		snprintf(exception, BUFSIZE, "DV Exception in tape path");
  		break;
  	case 0x07:
  		snprintf(exception, BUFSIZE, "DV Exception in drive");
  		break;
  	default:
  		snprintf(exception, BUFSIZE, "0x%02x",
  			sense->fmt.f71.emc);
  	}
  	/* Service Message */
  	switch (sense->fmt.f71.smc) {
  	case 0x01:
  		snprintf(service, BUFSIZE, "Repair impact is unknown");
  		break;
  	case 0x02:
  		snprintf(service, BUFSIZE, "Repair will not impact device "
  			"performance");
  		break;
  	case 0x03:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"channel path 0x%x on DV",
  				sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"channel path (0x%x-0x%x) on DV",
  				sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x04:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"interface 0x%x on DV", sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"interfaces (0x%x-0x%x) on DV",
  				sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x05:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable loader"
  				" 0x%x on DV", sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable loader"
  				" (0x%x-0x%x) on DV",
  				sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x07:
  		snprintf(service, BUFSIZE, "Repair will disable access to DV");
  		break;
  	case 0x08:
  		if (sense->fmt.f71.mdf == 0)
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"message display 0x%x on DV",
  				sense->fmt.f71.md[1]);
  		else
  			snprintf(service, BUFSIZE, "Repair will disable "
  				"message displays (0x%x-0x%x) on DV",
  				 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
  		break;
  	case 0x09:
  		snprintf(service, BUFSIZE, "Clean DV");
  		break;
  	default:
  		snprintf(service, BUFSIZE, "0x%02x",
  			sense->fmt.f71.smc);
  	}
  
  	dev_warn (&device->cdev->dev, "Device subsystem information: exception"
  		" %s, service %s\n", exception, service);
  out_nomem:
  	kfree(exception);
  	kfree(service);
  }
  
  /*
   * Print standard ERA Message
   */
  static void
  tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
  {
  	struct tape_3590_sense *sense;
  
  	sense = (struct tape_3590_sense *) irb->ecw;
  	if (sense->mc == 0)
  		return;
  	if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) {
  		if (tape_3590_msg[sense->mc] != NULL)
  			dev_warn (&device->cdev->dev, "The tape unit has "
  				"issued sense message %s\n",
  				tape_3590_msg[sense->mc]);
  		else
  			dev_warn (&device->cdev->dev, "The tape unit has "
  				"issued an unknown sense message code 0x%x\n",
  				sense->mc);
  		return;
  	}
  	if (sense->mc == 0xf0) {
  		/* Standard Media Information Message */
  		dev_warn (&device->cdev->dev, "MIM SEV=%i, MC=%02x, ES=%x/%x, "
  			"RC=%02x-%04x-%02x\n", sense->fmt.f70.sev, sense->mc,
  			sense->fmt.f70.emc, sense->fmt.f70.smc,
  			sense->fmt.f70.refcode, sense->fmt.f70.mid,
  			sense->fmt.f70.fid);
  		tape_3590_print_mim_msg_f0(device, irb);
  		return;
  	}
  	if (sense->mc == 0xf1) {
  		/* Standard I/O Subsystem Service Information Message */
  		dev_warn (&device->cdev->dev, "IOSIM SEV=%i, DEVTYPE=3590/%02x,"
  			" MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
  			sense->fmt.f71.sev, device->cdev->id.dev_model,
  			sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
  			sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
  			sense->fmt.f71.refcode3);
  		tape_3590_print_io_sim_msg_f1(device, irb);
  		return;
  	}
  	if (sense->mc == 0xf2) {
  		/* Standard Device Service Information Message */
  		dev_warn (&device->cdev->dev, "DEVSIM SEV=%i, DEVTYPE=3590/%02x"
  			", MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
  			sense->fmt.f71.sev, device->cdev->id.dev_model,
  			sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
  			sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
  			sense->fmt.f71.refcode3);
  		tape_3590_print_dev_sim_msg_f2(device, irb);
  		return;
  	}
  	if (sense->mc == 0xf3) {
  		/* Standard Library Service Information Message */
  		return;
  	}
  	dev_warn (&device->cdev->dev, "The tape unit has issued an unknown "
  		"sense message code %x\n", sense->mc);
  }
  
  static int tape_3590_crypt_error(struct tape_device *device,
  				 struct tape_request *request, struct irb *irb)
  {
  	u8 cu_rc;
  	u16 ekm_rc2;
  	char *sense;
  
  	sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
  	cu_rc = sense[0];
  	ekm_rc2 = *((u16*) &sense[10]);
  	if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
  		/* key not defined on EKM */
  		return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
  	if ((cu_rc == 1) || (cu_rc == 2))
  		/* No connection to EKM */
  		return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
  
  	dev_err (&device->cdev->dev, "The tape unit failed to obtain the "
  		"encryption key from EKM\n");
  
  	return tape_3590_erp_basic(device, request, irb, -ENOKEY);
  }
  
  /*
   *  3590 error Recovery routine:
   *  If possible, it tries to recover from the error. If this is not possible,
   *  inform the user about the problem.
   */
  static int
  tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
  		     struct irb *irb)
  {
  	struct tape_3590_sense *sense;
  
  	sense = (struct tape_3590_sense *) irb->ecw;
  
  	DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
  
  	/*
  	 * First check all RC-QRCs where we want to do something special
  	 *   - "break":     basic error recovery is done
  	 *   - "goto out:": just print error message if available
  	 */
  	switch (sense->rc_rqc) {
  
  	case 0x1110:
  		tape_3590_print_era_msg(device, irb);
  		return tape_3590_erp_read_buf_log(device, request, irb);
  
  	case 0x2011:
  		tape_3590_print_era_msg(device, irb);
  		return tape_3590_erp_read_alternate(device, request, irb);
  
  	case 0x2230:
  	case 0x2231:
  		tape_3590_print_era_msg(device, irb);
  		return tape_3590_erp_special_interrupt(device, request, irb);
  	case 0x2240:
  		return tape_3590_crypt_error(device, request, irb);
  
  	case 0x3010:
  		DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
  			  device->cdev_id);
  		return tape_3590_erp_basic(device, request, irb, -ENOSPC);
  	case 0x3012:
  		DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
  			  device->cdev_id);
  		return tape_3590_erp_basic(device, request, irb, -ENOSPC);
  	case 0x3020:
  		DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
  		return tape_3590_erp_basic(device, request, irb, -ENOSPC);
  
  	case 0x3122:
  		DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
  			  device->cdev_id);
  		return tape_3590_erp_basic(device, request, irb, -EIO);
  	case 0x3123:
  		DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
  			  device->cdev_id);
  		tape_med_state_set(device, MS_UNLOADED);
  		tape_3590_schedule_work(device, TO_CRYPT_OFF);
  		return tape_3590_erp_basic(device, request, irb, 0);
  
  	case 0x4010:
  		/*
  		 * print additional msg since default msg
  		 * "device intervention" is not very meaningfull
  		 */
  		tape_med_state_set(device, MS_UNLOADED);
  		tape_3590_schedule_work(device, TO_CRYPT_OFF);
  		return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
  	case 0x4012:		/* Device Long Busy */
  		/* XXX: Also use long busy handling here? */
  		DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
  		tape_3590_print_era_msg(device, irb);
  		return tape_3590_erp_basic(device, request, irb, -EBUSY);
  	case 0x4014:
  		DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
  		return tape_3590_erp_long_busy(device, request, irb);
  
  	case 0x5010:
  		if (sense->rac == 0xd0) {
  			/* Swap */
  			tape_3590_print_era_msg(device, irb);
  			return tape_3590_erp_swap(device, request, irb);
  		}
  		if (sense->rac == 0x26) {
  			/* Read Opposite */
  			tape_3590_print_era_msg(device, irb);
  			return tape_3590_erp_read_opposite(device, request,
  							   irb);
  		}
  		return tape_3590_erp_basic(device, request, irb, -EIO);
  	case 0x5020:
  	case 0x5021:
  	case 0x5022:
  	case 0x5040:
  	case 0x5041:
  	case 0x5042:
  		tape_3590_print_era_msg(device, irb);
  		return tape_3590_erp_swap(device, request, irb);
  
  	case 0x5110:
  	case 0x5111:
  		return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
  
  	case 0x5120:
  	case 0x1120:
  		tape_med_state_set(device, MS_UNLOADED);
  		tape_3590_schedule_work(device, TO_CRYPT_OFF);
  		return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
  
  	case 0x6020:
  		return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
  
  	case 0x8011:
  		return tape_3590_erp_basic(device, request, irb, -EPERM);
  	case 0x8013:
  		dev_warn (&device->cdev->dev, "A different host has privileged"
  			" access to the tape unit\n");
  		return tape_3590_erp_basic(device, request, irb, -EPERM);
  	default:
  		return tape_3590_erp_basic(device, request, irb, -EIO);
  	}
  }
  
  /*
   * 3590 interrupt handler:
   */
  static int
  tape_3590_irq(struct tape_device *device, struct tape_request *request,
  	      struct irb *irb)
  {
  	if (request == NULL)
  		return tape_3590_unsolicited_irq(device, irb);
  
  	if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
  	    (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
  	    (request->op == TO_WRI)) {
  		/* Write at end of volume */
  		DBF_EVENT(2, "End of volume\n");
  		return tape_3590_erp_failed(device, request, irb, -ENOSPC);
  	}
  
  	if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
  		return tape_3590_unit_check(device, request, irb);
  
  	if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
  		if (irb->scsw.cmd.dstat == DEV_STAT_UNIT_EXCEP) {
  			if (request->op == TO_FSB || request->op == TO_BSB)
  				request->rescnt++;
  			else
  				DBF_EVENT(5, "Unit Exception!\n");
  		}
  
  		return tape_3590_done(device, request);
  	}
  
  	if (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) {
  		DBF_EVENT(2, "channel end\n");
  		return TAPE_IO_PENDING;
  	}
  
  	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
  		DBF_EVENT(2, "Unit Attention when busy..\n");
  		return TAPE_IO_PENDING;
  	}
  
  	DBF_EVENT(6, "xunknownirq\n");
  	tape_dump_sense_dbf(device, request, irb);
  	return TAPE_IO_STOP;
  }
  
  
  static int tape_3590_read_dev_chars(struct tape_device *device,
  				    struct tape_3590_rdc_data *rdc_data)
  {
  	int rc;
  	struct tape_request *request;
  
  	request = tape_alloc_request(1, sizeof(*rdc_data));
  	if (IS_ERR(request))
  		return PTR_ERR(request);
  	request->op = TO_RDC;
  	tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data),
  		     request->cpdata);
  	rc = tape_do_io(device, request);
  	if (rc == 0)
  		memcpy(rdc_data, request->cpdata, sizeof(*rdc_data));
  	tape_free_request(request);
  	return rc;
  }
  
  /*
   * Setup device function
   */
  static int
  tape_3590_setup_device(struct tape_device *device)
  {
  	int rc;
  	struct tape_3590_disc_data *data;
  	struct tape_3590_rdc_data *rdc_data;
  
  	DBF_EVENT(6, "3590 device setup\n");
  	data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
  	if (data == NULL)
  		return -ENOMEM;
  	data->read_back_op = READ_PREVIOUS;
  	device->discdata = data;
  
  	rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA);
  	if (!rdc_data) {
  		rc = -ENOMEM;
  		goto fail_kmalloc;
  	}
  	rc = tape_3590_read_dev_chars(device, rdc_data);
  	if (rc) {
  		DBF_LH(3, "Read device characteristics failed!\n");
  		goto fail_rdc_data;
  	}
  	rc = tape_std_assign(device);
  	if (rc)
  		goto fail_rdc_data;
  	if (rdc_data->data[31] == 0x13) {
  		data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
  		tape_3592_disable_crypt(device);
  	} else {
  		DBF_EVENT(6, "Device has NO crypto support\n");
  	}
  	/* Try to find out if medium is loaded */
  	rc = tape_3590_sense_medium(device);
  	if (rc) {
  		DBF_LH(3, "3590 medium sense returned %d\n", rc);
  		goto fail_rdc_data;
  	}
  	return 0;
  
  fail_rdc_data:
  	kfree(rdc_data);
  fail_kmalloc:
  	kfree(data);
  	return rc;
  }
  
  /*
   * Cleanup device function
   */
  static void
  tape_3590_cleanup_device(struct tape_device *device)
  {
  	flush_workqueue(tape_3590_wq);
  	tape_std_unassign(device);
  
  	kfree(device->discdata);
  	device->discdata = NULL;
  }
  
  /*
   * List of 3590 magnetic tape commands.
   */
  static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
  	[MTRESET]	 = tape_std_mtreset,
  	[MTFSF]		 = tape_std_mtfsf,
  	[MTBSF]		 = tape_std_mtbsf,
  	[MTFSR]		 = tape_std_mtfsr,
  	[MTBSR]		 = tape_std_mtbsr,
  	[MTWEOF]	 = tape_std_mtweof,
  	[MTREW]		 = tape_std_mtrew,
  	[MTOFFL]	 = tape_std_mtoffl,
  	[MTNOP]		 = tape_std_mtnop,
  	[MTRETEN]	 = tape_std_mtreten,
  	[MTBSFM]	 = tape_std_mtbsfm,
  	[MTFSFM]	 = tape_std_mtfsfm,
  	[MTEOM]		 = tape_std_mteom,
  	[MTERASE]	 = tape_std_mterase,
  	[MTRAS1]	 = NULL,
  	[MTRAS2]	 = NULL,
  	[MTRAS3]	 = NULL,
  	[MTSETBLK]	 = tape_std_mtsetblk,
  	[MTSETDENSITY]	 = NULL,
  	[MTSEEK]	 = tape_3590_mtseek,
  	[MTTELL]	 = tape_3590_mttell,
  	[MTSETDRVBUFFER] = NULL,
  	[MTFSS]		 = NULL,
  	[MTBSS]		 = NULL,
  	[MTWSM]		 = NULL,
  	[MTLOCK]	 = NULL,
  	[MTUNLOCK]	 = NULL,
  	[MTLOAD]	 = tape_std_mtload,
  	[MTUNLOAD]	 = tape_std_mtunload,
  	[MTCOMPRESSION]	 = tape_std_mtcompression,
  	[MTSETPART]	 = NULL,
  	[MTMKPART]	 = NULL
  };
  
  /*
   * Tape discipline structure for 3590.
   */
  static struct tape_discipline tape_discipline_3590 = {
  	.owner = THIS_MODULE,
  	.setup_device = tape_3590_setup_device,
  	.cleanup_device = tape_3590_cleanup_device,
  	.process_eov = tape_std_process_eov,
  	.irq = tape_3590_irq,
  	.read_block = tape_std_read_block,
  	.write_block = tape_std_write_block,
  	.ioctl_fn = tape_3590_ioctl,
  	.mtop_array = tape_3590_mtop
  };
  
  static struct ccw_device_id tape_3590_ids[] = {
  	{CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
  	{CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
  	{ /* end of list */ }
  };
  
  static int
  tape_3590_online(struct ccw_device *cdev)
  {
  	return tape_generic_online(dev_get_drvdata(&cdev->dev),
  				   &tape_discipline_3590);
  }
  
  static struct ccw_driver tape_3590_driver = {
  	.driver = {
  		.name = "tape_3590",
  		.owner = THIS_MODULE,
  	},
  	.ids = tape_3590_ids,
  	.probe = tape_generic_probe,
  	.remove = tape_generic_remove,
  	.set_offline = tape_generic_offline,
  	.set_online = tape_3590_online,
  	.freeze = tape_generic_pm_suspend,
  	.int_class = IRQIO_TAP,
  };
  
  /*
   * Setup discipline structure.
   */
  static int
  tape_3590_init(void)
  {
  	int rc;
  
  	TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
  	debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
  #ifdef DBF_LIKE_HELL
  	debug_set_level(TAPE_DBF_AREA, 6);
  #endif
  
  	DBF_EVENT(3, "3590 init\n");
  
  	tape_3590_wq = alloc_workqueue("tape_3590", 0, 0);
  	if (!tape_3590_wq)
  		return -ENOMEM;
  
  	/* Register driver for 3590 tapes. */
  	rc = ccw_driver_register(&tape_3590_driver);
  	if (rc) {
  		destroy_workqueue(tape_3590_wq);
  		DBF_EVENT(3, "3590 init failed\n");
  	} else
  		DBF_EVENT(3, "3590 registered\n");
  	return rc;
  }
  
  static void
  tape_3590_exit(void)
  {
  	ccw_driver_unregister(&tape_3590_driver);
  	destroy_workqueue(tape_3590_wq);
  	debug_unregister(TAPE_DBF_AREA);
  }
  
  MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
  MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
  MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
  MODULE_LICENSE("GPL");
  
  module_init(tape_3590_init);
  module_exit(tape_3590_exit);
  