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851 lines
23 KiB
851 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Author(s)......: Holger Smolinski <[email protected]> |
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* Bugreports.to..: <[email protected]> |
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* Copyright IBM Corp. 1999, 2009 |
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*/ |
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|
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#define KMSG_COMPONENT "dasd-fba" |
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|
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#include <linux/stddef.h> |
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#include <linux/kernel.h> |
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#include <asm/debug.h> |
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#include <linux/slab.h> |
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#include <linux/hdreg.h> /* HDIO_GETGEO */ |
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#include <linux/bio.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <asm/idals.h> |
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#include <asm/ebcdic.h> |
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#include <asm/io.h> |
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#include <asm/ccwdev.h> |
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#include "dasd_int.h" |
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#include "dasd_fba.h" |
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#ifdef PRINTK_HEADER |
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#undef PRINTK_HEADER |
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#endif /* PRINTK_HEADER */ |
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#define PRINTK_HEADER "dasd(fba):" |
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#define FBA_DEFAULT_RETRIES 32 |
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#define DASD_FBA_CCW_WRITE 0x41 |
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#define DASD_FBA_CCW_READ 0x42 |
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#define DASD_FBA_CCW_LOCATE 0x43 |
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#define DASD_FBA_CCW_DEFINE_EXTENT 0x63 |
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MODULE_LICENSE("GPL"); |
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static struct dasd_discipline dasd_fba_discipline; |
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static void *dasd_fba_zero_page; |
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struct dasd_fba_private { |
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struct dasd_fba_characteristics rdc_data; |
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}; |
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static struct ccw_device_id dasd_fba_ids[] = { |
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{ CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1}, |
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{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2}, |
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{ /* end of list */ }, |
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}; |
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MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); |
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static int |
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dasd_fba_set_online(struct ccw_device *cdev) |
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{ |
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return dasd_generic_set_online(cdev, &dasd_fba_discipline); |
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} |
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static struct ccw_driver dasd_fba_driver = { |
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.driver = { |
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.name = "dasd-fba", |
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.owner = THIS_MODULE, |
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.dev_groups = dasd_dev_groups, |
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}, |
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.ids = dasd_fba_ids, |
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.probe = dasd_generic_probe, |
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.remove = dasd_generic_remove, |
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.set_offline = dasd_generic_set_offline, |
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.set_online = dasd_fba_set_online, |
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.notify = dasd_generic_notify, |
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.path_event = dasd_generic_path_event, |
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.int_class = IRQIO_DAS, |
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}; |
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static void |
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define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, |
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int blksize, int beg, int nr) |
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{ |
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ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; |
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ccw->flags = 0; |
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ccw->count = 16; |
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ccw->cda = (__u32) __pa(data); |
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memset(data, 0, sizeof (struct DE_fba_data)); |
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if (rw == WRITE) |
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(data->mask).perm = 0x0; |
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else if (rw == READ) |
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(data->mask).perm = 0x1; |
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else |
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data->mask.perm = 0x2; |
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data->blk_size = blksize; |
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data->ext_loc = beg; |
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data->ext_end = nr - 1; |
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} |
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static void |
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locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, |
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int block_nr, int block_ct) |
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{ |
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ccw->cmd_code = DASD_FBA_CCW_LOCATE; |
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ccw->flags = 0; |
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ccw->count = 8; |
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ccw->cda = (__u32) __pa(data); |
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memset(data, 0, sizeof (struct LO_fba_data)); |
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if (rw == WRITE) |
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data->operation.cmd = 0x5; |
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else if (rw == READ) |
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data->operation.cmd = 0x6; |
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else |
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data->operation.cmd = 0x8; |
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data->blk_nr = block_nr; |
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data->blk_ct = block_ct; |
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} |
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static int |
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dasd_fba_check_characteristics(struct dasd_device *device) |
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{ |
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struct dasd_fba_private *private = device->private; |
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struct ccw_device *cdev = device->cdev; |
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struct dasd_block *block; |
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int readonly, rc; |
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if (!private) { |
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private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); |
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if (!private) { |
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dev_warn(&device->cdev->dev, |
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"Allocating memory for private DASD " |
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"data failed\n"); |
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return -ENOMEM; |
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} |
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device->private = private; |
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} else { |
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memset(private, 0, sizeof(*private)); |
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} |
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block = dasd_alloc_block(); |
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if (IS_ERR(block)) { |
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DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " |
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"dasd block structure"); |
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device->private = NULL; |
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kfree(private); |
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return PTR_ERR(block); |
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} |
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device->block = block; |
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block->base = device; |
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/* Read Device Characteristics */ |
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rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, |
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&private->rdc_data, 32); |
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if (rc) { |
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DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " |
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"characteristics returned error %d", rc); |
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device->block = NULL; |
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dasd_free_block(block); |
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device->private = NULL; |
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kfree(private); |
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return rc; |
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} |
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device->default_expires = DASD_EXPIRES; |
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device->default_retries = FBA_DEFAULT_RETRIES; |
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dasd_path_set_opm(device, LPM_ANYPATH); |
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readonly = dasd_device_is_ro(device); |
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if (readonly) |
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set_bit(DASD_FLAG_DEVICE_RO, &device->flags); |
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/* FBA supports discard, set the according feature bit */ |
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dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1); |
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dev_info(&device->cdev->dev, |
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"New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " |
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"and %d B/blk%s\n", |
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cdev->id.dev_type, |
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cdev->id.dev_model, |
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cdev->id.cu_type, |
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cdev->id.cu_model, |
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((private->rdc_data.blk_bdsa * |
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(private->rdc_data.blk_size >> 9)) >> 11), |
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private->rdc_data.blk_size, |
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readonly ? ", read-only device" : ""); |
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return 0; |
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} |
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static int dasd_fba_do_analysis(struct dasd_block *block) |
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{ |
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struct dasd_fba_private *private = block->base->private; |
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int sb, rc; |
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rc = dasd_check_blocksize(private->rdc_data.blk_size); |
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if (rc) { |
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DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", |
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private->rdc_data.blk_size); |
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return rc; |
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} |
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block->blocks = private->rdc_data.blk_bdsa; |
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block->bp_block = private->rdc_data.blk_size; |
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block->s2b_shift = 0; /* bits to shift 512 to get a block */ |
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for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) |
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block->s2b_shift++; |
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return 0; |
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} |
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static int dasd_fba_fill_geometry(struct dasd_block *block, |
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struct hd_geometry *geo) |
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{ |
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if (dasd_check_blocksize(block->bp_block) != 0) |
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return -EINVAL; |
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geo->cylinders = (block->blocks << block->s2b_shift) >> 10; |
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geo->heads = 16; |
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geo->sectors = 128 >> block->s2b_shift; |
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return 0; |
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} |
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static dasd_erp_fn_t |
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dasd_fba_erp_action(struct dasd_ccw_req * cqr) |
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{ |
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return dasd_default_erp_action; |
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} |
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static dasd_erp_fn_t |
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dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) |
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{ |
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if (cqr->function == dasd_default_erp_action) |
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return dasd_default_erp_postaction; |
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DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", |
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cqr->function); |
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return NULL; |
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} |
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static void dasd_fba_check_for_device_change(struct dasd_device *device, |
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struct dasd_ccw_req *cqr, |
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struct irb *irb) |
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{ |
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char mask; |
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/* first of all check for state change pending interrupt */ |
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mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; |
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if ((irb->scsw.cmd.dstat & mask) == mask) |
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dasd_generic_handle_state_change(device); |
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}; |
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/* |
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* Builds a CCW with no data payload |
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*/ |
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static void ccw_write_no_data(struct ccw1 *ccw) |
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{ |
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ccw->cmd_code = DASD_FBA_CCW_WRITE; |
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ccw->flags |= CCW_FLAG_SLI; |
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ccw->count = 0; |
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} |
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/* |
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* Builds a CCW that writes only zeroes. |
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*/ |
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static void ccw_write_zero(struct ccw1 *ccw, int count) |
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{ |
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ccw->cmd_code = DASD_FBA_CCW_WRITE; |
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ccw->flags |= CCW_FLAG_SLI; |
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ccw->count = count; |
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ccw->cda = (__u32) (addr_t) dasd_fba_zero_page; |
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} |
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/* |
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* Helper function to count the amount of necessary CCWs within a given range |
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* with 4k alignment and command chaining in mind. |
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*/ |
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static int count_ccws(sector_t first_rec, sector_t last_rec, |
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unsigned int blocks_per_page) |
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{ |
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sector_t wz_stop = 0, d_stop = 0; |
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int cur_pos = 0; |
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int count = 0; |
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if (first_rec % blocks_per_page != 0) { |
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wz_stop = first_rec + blocks_per_page - |
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(first_rec % blocks_per_page) - 1; |
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if (wz_stop > last_rec) |
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wz_stop = last_rec; |
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cur_pos = wz_stop - first_rec + 1; |
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count++; |
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} |
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if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) { |
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if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0) |
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d_stop = last_rec - ((last_rec - blocks_per_page + 1) % |
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blocks_per_page); |
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else |
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d_stop = last_rec; |
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cur_pos += d_stop - (first_rec + cur_pos) + 1; |
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count++; |
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} |
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if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) |
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count++; |
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return count; |
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} |
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/* |
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* This function builds a CCW request for block layer discard requests. |
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* Each page in the z/VM hypervisor that represents certain records of an FBA |
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* device will be padded with zeros. This is a special behaviour of the WRITE |
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* command which is triggered when no data payload is added to the CCW. |
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* |
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* Note: Due to issues in some z/VM versions, we can't fully utilise this |
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* special behaviour. We have to keep a 4k (or 8 block) alignment in mind to |
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* work around those issues and write actual zeroes to the unaligned parts in |
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* the request. This workaround might be removed in the future. |
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*/ |
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static struct dasd_ccw_req *dasd_fba_build_cp_discard( |
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struct dasd_device *memdev, |
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struct dasd_block *block, |
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struct request *req) |
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{ |
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struct LO_fba_data *LO_data; |
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struct dasd_ccw_req *cqr; |
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struct ccw1 *ccw; |
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sector_t wz_stop = 0, d_stop = 0; |
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sector_t first_rec, last_rec; |
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unsigned int blksize = block->bp_block; |
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unsigned int blocks_per_page; |
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int wz_count = 0; |
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int d_count = 0; |
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int cur_pos = 0; /* Current position within the extent */ |
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int count = 0; |
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int cplength; |
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int datasize; |
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int nr_ccws; |
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first_rec = blk_rq_pos(req) >> block->s2b_shift; |
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last_rec = |
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(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; |
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count = last_rec - first_rec + 1; |
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blocks_per_page = BLOCKS_PER_PAGE(blksize); |
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nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page); |
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/* define extent + nr_ccws * locate record + nr_ccws * single CCW */ |
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cplength = 1 + 2 * nr_ccws; |
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datasize = sizeof(struct DE_fba_data) + |
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nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1)); |
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cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev, |
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blk_mq_rq_to_pdu(req)); |
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if (IS_ERR(cqr)) |
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return cqr; |
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ccw = cqr->cpaddr; |
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define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count); |
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LO_data = cqr->data + sizeof(struct DE_fba_data); |
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/* First part is not aligned. Calculate range to write zeroes. */ |
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if (first_rec % blocks_per_page != 0) { |
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wz_stop = first_rec + blocks_per_page - |
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(first_rec % blocks_per_page) - 1; |
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if (wz_stop > last_rec) |
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wz_stop = last_rec; |
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wz_count = wz_stop - first_rec + 1; |
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ccw[-1].flags |= CCW_FLAG_CC; |
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locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count); |
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ccw[-1].flags |= CCW_FLAG_CC; |
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ccw_write_zero(ccw++, wz_count * blksize); |
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cur_pos = wz_count; |
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} |
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/* We can do proper discard when we've got at least blocks_per_page blocks. */ |
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if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) { |
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/* is last record at page boundary? */ |
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if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0) |
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d_stop = last_rec - ((last_rec - blocks_per_page + 1) % |
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blocks_per_page); |
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else |
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d_stop = last_rec; |
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d_count = d_stop - (first_rec + cur_pos) + 1; |
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ccw[-1].flags |= CCW_FLAG_CC; |
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locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count); |
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ccw[-1].flags |= CCW_FLAG_CC; |
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ccw_write_no_data(ccw++); |
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cur_pos += d_count; |
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} |
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/* We might still have some bits left which need to be zeroed. */ |
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if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) { |
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if (d_stop != 0) |
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wz_count = last_rec - d_stop; |
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else if (wz_stop != 0) |
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wz_count = last_rec - wz_stop; |
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else |
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wz_count = count; |
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ccw[-1].flags |= CCW_FLAG_CC; |
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locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count); |
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ccw[-1].flags |= CCW_FLAG_CC; |
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ccw_write_zero(ccw++, wz_count * blksize); |
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} |
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if (blk_noretry_request(req) || |
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block->base->features & DASD_FEATURE_FAILFAST) |
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set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
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cqr->startdev = memdev; |
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cqr->memdev = memdev; |
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cqr->block = block; |
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cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ |
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cqr->retries = memdev->default_retries; |
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cqr->buildclk = get_tod_clock(); |
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cqr->status = DASD_CQR_FILLED; |
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return cqr; |
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} |
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static struct dasd_ccw_req *dasd_fba_build_cp_regular( |
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struct dasd_device *memdev, |
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struct dasd_block *block, |
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struct request *req) |
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{ |
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struct dasd_fba_private *private = block->base->private; |
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unsigned long *idaws; |
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struct LO_fba_data *LO_data; |
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struct dasd_ccw_req *cqr; |
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struct ccw1 *ccw; |
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struct req_iterator iter; |
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struct bio_vec bv; |
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char *dst; |
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int count, cidaw, cplength, datasize; |
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sector_t recid, first_rec, last_rec; |
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unsigned int blksize, off; |
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unsigned char cmd; |
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|
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if (rq_data_dir(req) == READ) { |
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cmd = DASD_FBA_CCW_READ; |
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} else if (rq_data_dir(req) == WRITE) { |
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cmd = DASD_FBA_CCW_WRITE; |
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} else |
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return ERR_PTR(-EINVAL); |
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blksize = block->bp_block; |
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/* Calculate record id of first and last block. */ |
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first_rec = blk_rq_pos(req) >> block->s2b_shift; |
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last_rec = |
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(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; |
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/* Check struct bio and count the number of blocks for the request. */ |
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count = 0; |
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cidaw = 0; |
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rq_for_each_segment(bv, req, iter) { |
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if (bv.bv_len & (blksize - 1)) |
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/* Fba can only do full blocks. */ |
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return ERR_PTR(-EINVAL); |
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count += bv.bv_len >> (block->s2b_shift + 9); |
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if (idal_is_needed (page_address(bv.bv_page), bv.bv_len)) |
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cidaw += bv.bv_len / blksize; |
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} |
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/* Paranoia. */ |
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if (count != last_rec - first_rec + 1) |
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return ERR_PTR(-EINVAL); |
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/* 1x define extent + 1x locate record + number of blocks */ |
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cplength = 2 + count; |
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/* 1x define extent + 1x locate record */ |
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datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + |
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cidaw * sizeof(unsigned long); |
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/* |
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* Find out number of additional locate record ccws if the device |
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* can't do data chaining. |
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*/ |
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if (private->rdc_data.mode.bits.data_chain == 0) { |
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cplength += count - 1; |
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datasize += (count - 1)*sizeof(struct LO_fba_data); |
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} |
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/* Allocate the ccw request. */ |
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cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev, |
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blk_mq_rq_to_pdu(req)); |
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if (IS_ERR(cqr)) |
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return cqr; |
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ccw = cqr->cpaddr; |
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/* First ccw is define extent. */ |
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define_extent(ccw++, cqr->data, rq_data_dir(req), |
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block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); |
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/* Build locate_record + read/write ccws. */ |
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idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); |
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LO_data = (struct LO_fba_data *) (idaws + cidaw); |
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/* Locate record for all blocks for smart devices. */ |
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if (private->rdc_data.mode.bits.data_chain != 0) { |
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ccw[-1].flags |= CCW_FLAG_CC; |
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locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); |
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} |
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recid = first_rec; |
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rq_for_each_segment(bv, req, iter) { |
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dst = bvec_virt(&bv); |
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if (dasd_page_cache) { |
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char *copy = kmem_cache_alloc(dasd_page_cache, |
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GFP_DMA | __GFP_NOWARN); |
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if (copy && rq_data_dir(req) == WRITE) |
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memcpy(copy + bv.bv_offset, dst, bv.bv_len); |
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if (copy) |
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dst = copy + bv.bv_offset; |
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} |
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for (off = 0; off < bv.bv_len; off += blksize) { |
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/* Locate record for stupid devices. */ |
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if (private->rdc_data.mode.bits.data_chain == 0) { |
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ccw[-1].flags |= CCW_FLAG_CC; |
|
locate_record(ccw, LO_data++, |
|
rq_data_dir(req), |
|
recid - first_rec, 1); |
|
ccw->flags = CCW_FLAG_CC; |
|
ccw++; |
|
} else { |
|
if (recid > first_rec) |
|
ccw[-1].flags |= CCW_FLAG_DC; |
|
else |
|
ccw[-1].flags |= CCW_FLAG_CC; |
|
} |
|
ccw->cmd_code = cmd; |
|
ccw->count = block->bp_block; |
|
if (idal_is_needed(dst, blksize)) { |
|
ccw->cda = (__u32)(addr_t) idaws; |
|
ccw->flags = CCW_FLAG_IDA; |
|
idaws = idal_create_words(idaws, dst, blksize); |
|
} else { |
|
ccw->cda = (__u32)(addr_t) dst; |
|
ccw->flags = 0; |
|
} |
|
ccw++; |
|
dst += blksize; |
|
recid++; |
|
} |
|
} |
|
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; /* default 5 minutes */ |
|
cqr->retries = memdev->default_retries; |
|
cqr->buildclk = get_tod_clock(); |
|
cqr->status = DASD_CQR_FILLED; |
|
return cqr; |
|
} |
|
|
|
static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev, |
|
struct dasd_block *block, |
|
struct request *req) |
|
{ |
|
if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES) |
|
return dasd_fba_build_cp_discard(memdev, block, req); |
|
else |
|
return dasd_fba_build_cp_regular(memdev, block, req); |
|
} |
|
|
|
static int |
|
dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) |
|
{ |
|
struct dasd_fba_private *private = cqr->block->base->private; |
|
struct ccw1 *ccw; |
|
struct req_iterator iter; |
|
struct bio_vec bv; |
|
char *dst, *cda; |
|
unsigned int blksize, off; |
|
int status; |
|
|
|
if (!dasd_page_cache) |
|
goto out; |
|
blksize = cqr->block->bp_block; |
|
ccw = cqr->cpaddr; |
|
/* Skip over define extent & locate record. */ |
|
ccw++; |
|
if (private->rdc_data.mode.bits.data_chain != 0) |
|
ccw++; |
|
rq_for_each_segment(bv, req, iter) { |
|
dst = bvec_virt(&bv); |
|
for (off = 0; off < bv.bv_len; off += blksize) { |
|
/* Skip locate record. */ |
|
if (private->rdc_data.mode.bits.data_chain == 0) |
|
ccw++; |
|
if (dst) { |
|
if (ccw->flags & CCW_FLAG_IDA) |
|
cda = *((char **)((addr_t) ccw->cda)); |
|
else |
|
cda = (char *)((addr_t) ccw->cda); |
|
if (dst != cda) { |
|
if (rq_data_dir(req) == READ) |
|
memcpy(dst, cda, bv.bv_len); |
|
kmem_cache_free(dasd_page_cache, |
|
(void *)((addr_t)cda & PAGE_MASK)); |
|
} |
|
dst = NULL; |
|
} |
|
ccw++; |
|
} |
|
} |
|
out: |
|
status = cqr->status == DASD_CQR_DONE; |
|
dasd_sfree_request(cqr, cqr->memdev); |
|
return status; |
|
} |
|
|
|
static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) |
|
{ |
|
if (cqr->retries < 0) |
|
cqr->status = DASD_CQR_FAILED; |
|
else |
|
cqr->status = DASD_CQR_FILLED; |
|
}; |
|
|
|
static int |
|
dasd_fba_fill_info(struct dasd_device * device, |
|
struct dasd_information2_t * info) |
|
{ |
|
struct dasd_fba_private *private = device->private; |
|
|
|
info->label_block = 1; |
|
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_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, |
|
char *reason) |
|
{ |
|
u64 *sense; |
|
|
|
sense = (u64 *) dasd_get_sense(irb); |
|
if (sense) { |
|
DBF_DEV_EVENT(DBF_EMERG, device, |
|
"%s: %s %02x%02x%02x %016llx %016llx %016llx " |
|
"%016llx", reason, |
|
scsw_is_tm(&irb->scsw) ? "t" : "c", |
|
scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), |
|
scsw_dstat(&irb->scsw), sense[0], sense[1], |
|
sense[2], sense[3]); |
|
} else { |
|
DBF_DEV_EVENT(DBF_EMERG, device, "%s", |
|
"SORRY - NO VALID SENSE AVAILABLE\n"); |
|
} |
|
} |
|
|
|
|
|
static void |
|
dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, |
|
struct irb *irb) |
|
{ |
|
char *page; |
|
struct ccw1 *act, *end, *last; |
|
int len, sl, sct, count; |
|
|
|
page = (char *) get_zeroed_page(GFP_ATOMIC); |
|
if (page == NULL) { |
|
DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
|
"No memory to dump sense data"); |
|
return; |
|
} |
|
len = sprintf(page, PRINTK_HEADER |
|
" I/O status report for device %s:\n", |
|
dev_name(&device->cdev->dev)); |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" in req: %p CS: 0x%02X DS: 0x%02X\n", req, |
|
irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" device %s: Failing CCW: %p\n", |
|
dev_name(&device->cdev->dev), |
|
(void *) (addr_t) irb->scsw.cmd.cpa); |
|
if (irb->esw.esw0.erw.cons) { |
|
for (sl = 0; sl < 4; sl++) { |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" Sense(hex) %2d-%2d:", |
|
(8 * sl), ((8 * sl) + 7)); |
|
|
|
for (sct = 0; sct < 8; sct++) { |
|
len += sprintf(page + len, " %02x", |
|
irb->ecw[8 * sl + sct]); |
|
} |
|
len += sprintf(page + len, "\n"); |
|
} |
|
} else { |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" SORRY - NO VALID SENSE AVAILABLE\n"); |
|
} |
|
printk(KERN_ERR "%s", page); |
|
|
|
/* dump the Channel Program */ |
|
/* print first CCWs (maximum 8) */ |
|
act = req->cpaddr; |
|
for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); |
|
end = min(act + 8, last); |
|
len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req); |
|
while (act <= end) { |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" CCW %p: %08X %08X DAT:", |
|
act, ((int *) act)[0], ((int *) act)[1]); |
|
for (count = 0; count < 32 && count < act->count; |
|
count += sizeof(int)) |
|
len += sprintf(page + len, " %08X", |
|
((int *) (addr_t) act->cda) |
|
[(count>>2)]); |
|
len += sprintf(page + len, "\n"); |
|
act++; |
|
} |
|
printk(KERN_ERR "%s", page); |
|
|
|
|
|
/* print failing CCW area */ |
|
len = 0; |
|
if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { |
|
act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; |
|
len += sprintf(page + len, PRINTK_HEADER "......\n"); |
|
} |
|
end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); |
|
while (act <= end) { |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" CCW %p: %08X %08X DAT:", |
|
act, ((int *) act)[0], ((int *) act)[1]); |
|
for (count = 0; count < 32 && count < act->count; |
|
count += sizeof(int)) |
|
len += sprintf(page + len, " %08X", |
|
((int *) (addr_t) act->cda) |
|
[(count>>2)]); |
|
len += sprintf(page + len, "\n"); |
|
act++; |
|
} |
|
|
|
/* print last CCWs */ |
|
if (act < last - 2) { |
|
act = last - 2; |
|
len += sprintf(page + len, PRINTK_HEADER "......\n"); |
|
} |
|
while (act <= last) { |
|
len += sprintf(page + len, PRINTK_HEADER |
|
" CCW %p: %08X %08X DAT:", |
|
act, ((int *) act)[0], ((int *) act)[1]); |
|
for (count = 0; count < 32 && count < act->count; |
|
count += sizeof(int)) |
|
len += sprintf(page + len, " %08X", |
|
((int *) (addr_t) act->cda) |
|
[(count>>2)]); |
|
len += sprintf(page + len, "\n"); |
|
act++; |
|
} |
|
if (len > 0) |
|
printk(KERN_ERR "%s", page); |
|
free_page((unsigned long) page); |
|
} |
|
|
|
/* |
|
* Initialize block layer request queue. |
|
*/ |
|
static void dasd_fba_setup_blk_queue(struct dasd_block *block) |
|
{ |
|
unsigned int logical_block_size = block->bp_block; |
|
struct request_queue *q = block->request_queue; |
|
unsigned int max_bytes, max_discard_sectors; |
|
int max; |
|
|
|
max = DASD_FBA_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); |
|
|
|
q->limits.discard_granularity = logical_block_size; |
|
q->limits.discard_alignment = PAGE_SIZE; |
|
|
|
/* Calculate max_discard_sectors and make it PAGE aligned */ |
|
max_bytes = USHRT_MAX * logical_block_size; |
|
max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE); |
|
max_discard_sectors = max_bytes / logical_block_size; |
|
|
|
blk_queue_max_discard_sectors(q, max_discard_sectors); |
|
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors); |
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); |
|
} |
|
|
|
static int dasd_fba_pe_handler(struct dasd_device *device, |
|
__u8 tbvpm, __u8 fcsecpm) |
|
{ |
|
return dasd_generic_verify_path(device, tbvpm); |
|
} |
|
|
|
static struct dasd_discipline dasd_fba_discipline = { |
|
.owner = THIS_MODULE, |
|
.name = "FBA ", |
|
.ebcname = "FBA ", |
|
.check_device = dasd_fba_check_characteristics, |
|
.do_analysis = dasd_fba_do_analysis, |
|
.pe_handler = dasd_fba_pe_handler, |
|
.setup_blk_queue = dasd_fba_setup_blk_queue, |
|
.fill_geometry = dasd_fba_fill_geometry, |
|
.start_IO = dasd_start_IO, |
|
.term_IO = dasd_term_IO, |
|
.handle_terminated_request = dasd_fba_handle_terminated_request, |
|
.erp_action = dasd_fba_erp_action, |
|
.erp_postaction = dasd_fba_erp_postaction, |
|
.check_for_device_change = dasd_fba_check_for_device_change, |
|
.build_cp = dasd_fba_build_cp, |
|
.free_cp = dasd_fba_free_cp, |
|
.dump_sense = dasd_fba_dump_sense, |
|
.dump_sense_dbf = dasd_fba_dump_sense_dbf, |
|
.fill_info = dasd_fba_fill_info, |
|
}; |
|
|
|
static int __init |
|
dasd_fba_init(void) |
|
{ |
|
int ret; |
|
|
|
ASCEBC(dasd_fba_discipline.ebcname, 4); |
|
|
|
dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); |
|
if (!dasd_fba_zero_page) |
|
return -ENOMEM; |
|
|
|
ret = ccw_driver_register(&dasd_fba_driver); |
|
if (!ret) |
|
wait_for_device_probe(); |
|
|
|
return ret; |
|
} |
|
|
|
static void __exit |
|
dasd_fba_cleanup(void) |
|
{ |
|
ccw_driver_unregister(&dasd_fba_driver); |
|
free_page((unsigned long)dasd_fba_zero_page); |
|
} |
|
|
|
module_init(dasd_fba_init); |
|
module_exit(dasd_fba_cleanup);
|
|
|