| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| * Based on.......: linux/drivers/s390/block/mdisk.c |
| * ...............: by Hartmunt Penner <hpenner@de.ibm.com> |
| * Bugreports.to..: <Linux390@de.ibm.com> |
| * Copyright IBM Corp. 1999, 2000 |
| * |
| */ |
| |
| #define KMSG_COMPONENT "dasd" |
| |
| #include <linux/kernel_stat.h> |
| #include <linux/stddef.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/hdreg.h> |
| #include <linux/bio.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/jiffies.h> |
| |
| #include <asm/dasd.h> |
| #include <asm/debug.h> |
| #include <asm/diag.h> |
| #include <asm/ebcdic.h> |
| #include <asm/io.h> |
| #include <asm/irq.h> |
| #include <asm/vtoc.h> |
| |
| #include "dasd_int.h" |
| #include "dasd_diag.h" |
| |
| #define PRINTK_HEADER "dasd(diag):" |
| |
| MODULE_LICENSE("GPL"); |
| |
| /* The maximum number of blocks per request (max_blocks) is dependent on the |
| * amount of storage that is available in the static I/O buffer for each |
| * device. Currently each device gets 2 pages. We want to fit two requests |
| * into the available memory so that we can immediately start the next if one |
| * finishes. */ |
| #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ |
| sizeof(struct dasd_diag_req)) / \ |
| sizeof(struct dasd_diag_bio)) / 2) |
| #define DIAG_MAX_RETRIES 32 |
| #define DIAG_TIMEOUT 50 |
| |
| static struct dasd_discipline dasd_diag_discipline; |
| |
| struct dasd_diag_private { |
| struct dasd_diag_characteristics rdc_data; |
| struct dasd_diag_rw_io iob; |
| struct dasd_diag_init_io iib; |
| blocknum_t pt_block; |
| struct ccw_dev_id dev_id; |
| }; |
| |
| struct dasd_diag_req { |
| unsigned int block_count; |
| struct dasd_diag_bio bio[0]; |
| }; |
| |
| static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ |
| |
| /* Perform DIAG250 call with block I/O parameter list iob (input and output) |
| * and function code cmd. |
| * In case of an exception return 3. Otherwise return result of bitwise OR of |
| * resulting condition code and DIAG return code. */ |
| static inline int __dia250(void *iob, int cmd) |
| { |
| register unsigned long reg2 asm ("2") = (unsigned long) iob; |
| typedef union { |
| struct dasd_diag_init_io init_io; |
| struct dasd_diag_rw_io rw_io; |
| } addr_type; |
| int rc; |
| |
| rc = 3; |
| asm volatile( |
| " diag 2,%2,0x250\n" |
| "0: ipm %0\n" |
| " srl %0,28\n" |
| " or %0,3\n" |
| "1:\n" |
| EX_TABLE(0b,1b) |
| : "+d" (rc), "=m" (*(addr_type *) iob) |
| : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) |
| : "3", "cc"); |
| return rc; |
| } |
| |
| static inline int dia250(void *iob, int cmd) |
| { |
| diag_stat_inc(DIAG_STAT_X250); |
| return __dia250(iob, cmd); |
| } |
| |
| /* Initialize block I/O to DIAG device using the specified blocksize and |
| * block offset. On success, return zero and set end_block to contain the |
| * number of blocks on the device minus the specified offset. Return non-zero |
| * otherwise. */ |
| static inline int |
| mdsk_init_io(struct dasd_device *device, unsigned int blocksize, |
| blocknum_t offset, blocknum_t *end_block) |
| { |
| struct dasd_diag_private *private = device->private; |
| struct dasd_diag_init_io *iib = &private->iib; |
| int rc; |
| |
| memset(iib, 0, sizeof (struct dasd_diag_init_io)); |
| |
| iib->dev_nr = private->dev_id.devno; |
| iib->block_size = blocksize; |
| iib->offset = offset; |
| iib->flaga = DASD_DIAG_FLAGA_DEFAULT; |
| |
| rc = dia250(iib, INIT_BIO); |
| |
| if ((rc & 3) == 0 && end_block) |
| *end_block = iib->end_block; |
| |
| return rc; |
| } |
| |
| /* Remove block I/O environment for device. Return zero on success, non-zero |
| * otherwise. */ |
| static inline int |
| mdsk_term_io(struct dasd_device * device) |
| { |
| struct dasd_diag_private *private = device->private; |
| struct dasd_diag_init_io *iib = &private->iib; |
| int rc; |
| |
| memset(iib, 0, sizeof (struct dasd_diag_init_io)); |
| iib->dev_nr = private->dev_id.devno; |
| rc = dia250(iib, TERM_BIO); |
| return rc; |
| } |
| |
| /* Error recovery for failed DIAG requests - try to reestablish the DIAG |
| * environment. */ |
| static void |
| dasd_diag_erp(struct dasd_device *device) |
| { |
| int rc; |
| |
| mdsk_term_io(device); |
| rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); |
| if (rc == 4) { |
| if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags))) |
| pr_warn("%s: The access mode of a DIAG device changed to read-only\n", |
| dev_name(&device->cdev->dev)); |
| rc = 0; |
| } |
| if (rc) |
| pr_warn("%s: DIAG ERP failed with rc=%d\n", |
| dev_name(&device->cdev->dev), rc); |
| } |
| |
| /* Start a given request at the device. Return zero on success, non-zero |
| * otherwise. */ |
| static int |
| dasd_start_diag(struct dasd_ccw_req * cqr) |
| { |
| struct dasd_device *device; |
| struct dasd_diag_private *private; |
| struct dasd_diag_req *dreq; |
| int rc; |
| |
| device = cqr->startdev; |
| if (cqr->retries < 0) { |
| DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " |
| "- no retry left)", cqr); |
| cqr->status = DASD_CQR_ERROR; |
| return -EIO; |
| } |
| private = device->private; |
| dreq = cqr->data; |
| |
| private->iob.dev_nr = private->dev_id.devno; |
| private->iob.key = 0; |
| private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; |
| private->iob.block_count = dreq->block_count; |
| private->iob.interrupt_params = (addr_t) cqr; |
| private->iob.bio_list = dreq->bio; |
| private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
| |
| cqr->startclk = get_tod_clock(); |
| cqr->starttime = jiffies; |
| cqr->retries--; |
| |
| rc = dia250(&private->iob, RW_BIO); |
| switch (rc) { |
| case 0: /* Synchronous I/O finished successfully */ |
| cqr->stopclk = get_tod_clock(); |
| cqr->status = DASD_CQR_SUCCESS; |
| /* Indicate to calling function that only a dasd_schedule_bh() |
| and no timer is needed */ |
| rc = -EACCES; |
| break; |
| case 8: /* Asynchronous I/O was started */ |
| cqr->status = DASD_CQR_IN_IO; |
| rc = 0; |
| break; |
| default: /* Error condition */ |
| cqr->status = DASD_CQR_QUEUED; |
| DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); |
| dasd_diag_erp(device); |
| rc = -EIO; |
| break; |
| } |
| cqr->intrc = rc; |
| return rc; |
| } |
| |
| /* Terminate given request at the device. */ |
| static int |
| dasd_diag_term_IO(struct dasd_ccw_req * cqr) |
| { |
| struct dasd_device *device; |
| |
| device = cqr->startdev; |
| mdsk_term_io(device); |
| mdsk_init_io(device, device->block->bp_block, 0, NULL); |
| cqr->status = DASD_CQR_CLEAR_PENDING; |
| cqr->stopclk = get_tod_clock(); |
| dasd_schedule_device_bh(device); |
| return 0; |
| } |
| |
| /* Handle external interruption. */ |
| static void dasd_ext_handler(struct ext_code ext_code, |
| unsigned int param32, unsigned long param64) |
| { |
| struct dasd_ccw_req *cqr, *next; |
| struct dasd_device *device; |
| unsigned long expires; |
| unsigned long flags; |
| addr_t ip; |
| int rc; |
| |
| switch (ext_code.subcode >> 8) { |
| case DASD_DIAG_CODE_31BIT: |
| ip = (addr_t) param32; |
| break; |
| case DASD_DIAG_CODE_64BIT: |
| ip = (addr_t) param64; |
| break; |
| default: |
| return; |
| } |
| inc_irq_stat(IRQEXT_DSD); |
| if (!ip) { /* no intparm: unsolicited interrupt */ |
| DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " |
| "interrupt"); |
| return; |
| } |
| cqr = (struct dasd_ccw_req *) ip; |
| device = (struct dasd_device *) cqr->startdev; |
| if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
| DBF_DEV_EVENT(DBF_WARNING, device, |
| " magic number of dasd_ccw_req 0x%08X doesn't" |
| " match discipline 0x%08X", |
| cqr->magic, *(int *) (&device->discipline->name)); |
| return; |
| } |
| |
| /* get irq lock to modify request queue */ |
| spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
| |
| /* Check for a pending clear operation */ |
| if (cqr->status == DASD_CQR_CLEAR_PENDING) { |
| cqr->status = DASD_CQR_CLEARED; |
| dasd_device_clear_timer(device); |
| dasd_schedule_device_bh(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| return; |
| } |
| |
| cqr->stopclk = get_tod_clock(); |
| |
| expires = 0; |
| if ((ext_code.subcode & 0xff) == 0) { |
| cqr->status = DASD_CQR_SUCCESS; |
| /* Start first request on queue if possible -> fast_io. */ |
| if (!list_empty(&device->ccw_queue)) { |
| next = list_entry(device->ccw_queue.next, |
| struct dasd_ccw_req, devlist); |
| if (next->status == DASD_CQR_QUEUED) { |
| rc = dasd_start_diag(next); |
| if (rc == 0) |
| expires = next->expires; |
| } |
| } |
| } else { |
| cqr->status = DASD_CQR_QUEUED; |
| DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " |
| "request %p was %d (%d retries left)", cqr, |
| ext_code.subcode & 0xff, cqr->retries); |
| dasd_diag_erp(device); |
| } |
| |
| if (expires != 0) |
| dasd_device_set_timer(device, expires); |
| else |
| dasd_device_clear_timer(device); |
| dasd_schedule_device_bh(device); |
| |
| spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
| } |
| |
| /* Check whether device can be controlled by DIAG discipline. Return zero on |
| * success, non-zero otherwise. */ |
| static int |
| dasd_diag_check_device(struct dasd_device *device) |
| { |
| struct dasd_diag_private *private = device->private; |
| struct dasd_diag_characteristics *rdc_data; |
| struct vtoc_cms_label *label; |
| struct dasd_block *block; |
| struct dasd_diag_bio *bio; |
| unsigned int sb, bsize; |
| blocknum_t end_block; |
| int rc; |
| |
| if (private == NULL) { |
| private = kzalloc(sizeof(*private), GFP_KERNEL); |
| if (private == NULL) { |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "Allocating memory for private DASD data " |
| "failed\n"); |
| return -ENOMEM; |
| } |
| ccw_device_get_id(device->cdev, &private->dev_id); |
| device->private = private; |
| } |
| block = dasd_alloc_block(); |
| if (IS_ERR(block)) { |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "could not allocate dasd block structure"); |
| device->private = NULL; |
| kfree(private); |
| return PTR_ERR(block); |
| } |
| device->block = block; |
| block->base = device; |
| |
| /* Read Device Characteristics */ |
| rdc_data = &private->rdc_data; |
| rdc_data->dev_nr = private->dev_id.devno; |
| rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); |
| |
| rc = diag210((struct diag210 *) rdc_data); |
| if (rc) { |
| DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " |
| "information (rc=%d)", rc); |
| rc = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| device->default_expires = DIAG_TIMEOUT; |
| device->default_retries = DIAG_MAX_RETRIES; |
| |
| /* Figure out position of label block */ |
| switch (private->rdc_data.vdev_class) { |
| case DEV_CLASS_FBA: |
| private->pt_block = 1; |
| break; |
| case DEV_CLASS_ECKD: |
| private->pt_block = 2; |
| break; |
| default: |
| pr_warn("%s: Device type %d is not supported in DIAG mode\n", |
| dev_name(&device->cdev->dev), |
| private->rdc_data.vdev_class); |
| rc = -EOPNOTSUPP; |
| goto out; |
| } |
| |
| DBF_DEV_EVENT(DBF_INFO, device, |
| "%04X: %04X on real %04X/%02X", |
| rdc_data->dev_nr, |
| rdc_data->vdev_type, |
| rdc_data->rdev_type, rdc_data->rdev_model); |
| |
| /* terminate all outstanding operations */ |
| mdsk_term_io(device); |
| |
| /* figure out blocksize of device */ |
| label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
| if (label == NULL) { |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "No memory to allocate initialization request"); |
| rc = -ENOMEM; |
| goto out; |
| } |
| bio = kzalloc(sizeof(*bio), GFP_KERNEL); |
| if (bio == NULL) { |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "No memory to allocate initialization bio"); |
| rc = -ENOMEM; |
| goto out_label; |
| } |
| rc = 0; |
| end_block = 0; |
| /* try all sizes - needed for ECKD devices */ |
| for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { |
| mdsk_init_io(device, bsize, 0, &end_block); |
| memset(bio, 0, sizeof(*bio)); |
| bio->type = MDSK_READ_REQ; |
| bio->block_number = private->pt_block + 1; |
| bio->buffer = label; |
| memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
| private->iob.dev_nr = rdc_data->dev_nr; |
| private->iob.key = 0; |
| private->iob.flags = 0; /* do synchronous io */ |
| private->iob.block_count = 1; |
| private->iob.interrupt_params = 0; |
| private->iob.bio_list = bio; |
| private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
| rc = dia250(&private->iob, RW_BIO); |
| if (rc == 3) { |
| pr_warn("%s: A 64-bit DIAG call failed\n", |
| dev_name(&device->cdev->dev)); |
| rc = -EOPNOTSUPP; |
| goto out_bio; |
| } |
| mdsk_term_io(device); |
| if (rc == 0) |
| break; |
| } |
| if (bsize > PAGE_SIZE) { |
| pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n", |
| dev_name(&device->cdev->dev), rc); |
| rc = -EIO; |
| goto out_bio; |
| } |
| /* check for label block */ |
| if (memcmp(label->label_id, DASD_DIAG_CMS1, |
| sizeof(DASD_DIAG_CMS1)) == 0) { |
| /* get formatted blocksize from label block */ |
| bsize = (unsigned int) label->block_size; |
| block->blocks = (unsigned long) label->block_count; |
| } else |
| block->blocks = end_block; |
| block->bp_block = bsize; |
| block->s2b_shift = 0; /* bits to shift 512 to get a block */ |
| for (sb = 512; sb < bsize; sb = sb << 1) |
| block->s2b_shift++; |
| rc = mdsk_init_io(device, block->bp_block, 0, NULL); |
| if (rc && (rc != 4)) { |
| pr_warn("%s: DIAG initialization failed with rc=%d\n", |
| dev_name(&device->cdev->dev), rc); |
| rc = -EIO; |
| } else { |
| if (rc == 4) |
| set_bit(DASD_FLAG_DEVICE_RO, &device->flags); |
| pr_info("%s: New DASD with %ld byte/block, total size %ld " |
| "KB%s\n", dev_name(&device->cdev->dev), |
| (unsigned long) block->bp_block, |
| (unsigned long) (block->blocks << |
| block->s2b_shift) >> 1, |
| (rc == 4) ? ", read-only device" : ""); |
| rc = 0; |
| } |
| out_bio: |
| kfree(bio); |
| out_label: |
| free_page((long) label); |
| out: |
| if (rc) { |
| device->block = NULL; |
| dasd_free_block(block); |
| device->private = NULL; |
| kfree(private); |
| } |
| return rc; |
| } |
| |
| /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
| * otherwise. */ |
| static int |
| dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) |
| { |
| if (dasd_check_blocksize(block->bp_block) != 0) |
| return -EINVAL; |
| geo->cylinders = (block->blocks << block->s2b_shift) >> 10; |
| geo->heads = 16; |
| geo->sectors = 128 >> block->s2b_shift; |
| return 0; |
| } |
| |
| static dasd_erp_fn_t |
| dasd_diag_erp_action(struct dasd_ccw_req * cqr) |
| { |
| return dasd_default_erp_action; |
| } |
| |
| static dasd_erp_fn_t |
| dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) |
| { |
| return dasd_default_erp_postaction; |
| } |
| |
| /* Create DASD request from block device request. Return pointer to new |
| * request on success, ERR_PTR otherwise. */ |
| static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, |
| struct dasd_block *block, |
| struct request *req) |
| { |
| struct dasd_ccw_req *cqr; |
| struct dasd_diag_req *dreq; |
| struct dasd_diag_bio *dbio; |
| struct req_iterator iter; |
| struct bio_vec bv; |
| char *dst; |
| unsigned int count, datasize; |
| sector_t recid, first_rec, last_rec; |
| unsigned int blksize, off; |
| unsigned char rw_cmd; |
| |
| if (rq_data_dir(req) == READ) |
| rw_cmd = MDSK_READ_REQ; |
| else if (rq_data_dir(req) == WRITE) |
| rw_cmd = MDSK_WRITE_REQ; |
| else |
| return ERR_PTR(-EINVAL); |
| blksize = block->bp_block; |
| /* Calculate record id of first and last block. */ |
| first_rec = blk_rq_pos(req) >> block->s2b_shift; |
| last_rec = |
| (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; |
| /* Check struct bio and count the number of blocks for the request. */ |
| count = 0; |
| rq_for_each_segment(bv, req, iter) { |
| if (bv.bv_len & (blksize - 1)) |
| /* Fba can only do full blocks. */ |
| return ERR_PTR(-EINVAL); |
| count += bv.bv_len >> (block->s2b_shift + 9); |
| } |
| /* Paranoia. */ |
| if (count != last_rec - first_rec + 1) |
| return ERR_PTR(-EINVAL); |
| /* Build the request */ |
| datasize = sizeof(struct dasd_diag_req) + |
| count*sizeof(struct dasd_diag_bio); |
| cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev, |
| blk_mq_rq_to_pdu(req)); |
| if (IS_ERR(cqr)) |
| return cqr; |
| |
| dreq = (struct dasd_diag_req *) cqr->data; |
| dreq->block_count = count; |
| dbio = dreq->bio; |
| recid = first_rec; |
| rq_for_each_segment(bv, req, iter) { |
| dst = page_address(bv.bv_page) + bv.bv_offset; |
| for (off = 0; off < bv.bv_len; off += blksize) { |
| memset(dbio, 0, sizeof (struct dasd_diag_bio)); |
| dbio->type = rw_cmd; |
| dbio->block_number = recid + 1; |
| dbio->buffer = dst; |
| dbio++; |
| dst += blksize; |
| recid++; |
| } |
| } |
| cqr->retries = memdev->default_retries; |
| cqr->buildclk = get_tod_clock(); |
| if (blk_noretry_request(req) || |
| block->base->features & DASD_FEATURE_FAILFAST) |
| set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
| cqr->startdev = memdev; |
| cqr->memdev = memdev; |
| cqr->block = block; |
| cqr->expires = memdev->default_expires * HZ; |
| cqr->status = DASD_CQR_FILLED; |
| return cqr; |
| } |
| |
| /* Release DASD request. Return non-zero if request was successful, zero |
| * otherwise. */ |
| static int |
| dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) |
| { |
| int status; |
| |
| status = cqr->status == DASD_CQR_DONE; |
| dasd_sfree_request(cqr, cqr->memdev); |
| return status; |
| } |
| |
| static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) |
| { |
| if (cqr->retries < 0) |
| cqr->status = DASD_CQR_FAILED; |
| else |
| cqr->status = DASD_CQR_FILLED; |
| }; |
| |
| /* Fill in IOCTL data for device. */ |
| static int |
| dasd_diag_fill_info(struct dasd_device * device, |
| struct dasd_information2_t * info) |
| { |
| struct dasd_diag_private *private = device->private; |
| |
| info->label_block = (unsigned int) private->pt_block; |
| info->FBA_layout = 1; |
| info->format = DASD_FORMAT_LDL; |
| info->characteristics_size = sizeof(private->rdc_data); |
| memcpy(info->characteristics, &private->rdc_data, |
| sizeof(private->rdc_data)); |
| info->confdata_size = 0; |
| return 0; |
| } |
| |
| static void |
| dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, |
| struct irb *stat) |
| { |
| DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
| "dump sense not available for DIAG data"); |
| } |
| |
| /* |
| * Initialize block layer request queue. |
| */ |
| static void dasd_diag_setup_blk_queue(struct dasd_block *block) |
| { |
| unsigned int logical_block_size = block->bp_block; |
| struct request_queue *q = block->request_queue; |
| int max; |
| |
| max = DIAG_MAX_BLOCKS << block->s2b_shift; |
| blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
| q->limits.max_dev_sectors = max; |
| blk_queue_logical_block_size(q, logical_block_size); |
| blk_queue_max_hw_sectors(q, max); |
| blk_queue_max_segments(q, USHRT_MAX); |
| /* With page sized segments each segment can be translated into one idaw/tidaw */ |
| blk_queue_max_segment_size(q, PAGE_SIZE); |
| blk_queue_segment_boundary(q, PAGE_SIZE - 1); |
| } |
| |
| static struct dasd_discipline dasd_diag_discipline = { |
| .owner = THIS_MODULE, |
| .name = "DIAG", |
| .ebcname = "DIAG", |
| .check_device = dasd_diag_check_device, |
| .verify_path = dasd_generic_verify_path, |
| .fill_geometry = dasd_diag_fill_geometry, |
| .setup_blk_queue = dasd_diag_setup_blk_queue, |
| .start_IO = dasd_start_diag, |
| .term_IO = dasd_diag_term_IO, |
| .handle_terminated_request = dasd_diag_handle_terminated_request, |
| .erp_action = dasd_diag_erp_action, |
| .erp_postaction = dasd_diag_erp_postaction, |
| .build_cp = dasd_diag_build_cp, |
| .free_cp = dasd_diag_free_cp, |
| .dump_sense = dasd_diag_dump_sense, |
| .fill_info = dasd_diag_fill_info, |
| }; |
| |
| static int __init |
| dasd_diag_init(void) |
| { |
| if (!MACHINE_IS_VM) { |
| pr_info("Discipline %s cannot be used without z/VM\n", |
| dasd_diag_discipline.name); |
| return -ENODEV; |
| } |
| ASCEBC(dasd_diag_discipline.ebcname, 4); |
| |
| irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
| register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); |
| dasd_diag_discipline_pointer = &dasd_diag_discipline; |
| return 0; |
| } |
| |
| static void __exit |
| dasd_diag_cleanup(void) |
| { |
| unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); |
| irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); |
| dasd_diag_discipline_pointer = NULL; |
| } |
| |
| module_init(dasd_diag_init); |
| module_exit(dasd_diag_cleanup); |