![Hannes Reinecke](/assets/img/avatar_default.png)
This patch implements generic block layer timeout handling callbacks for DASDs. When the timeout expires the respective cqr is aborted. With this timeout handler time-critical request abort is guaranteed as the abort does not depend on the internal state of the various DASD driver queues. Signed-off-by: Hannes Reinecke <hare@suse.de> Acked-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
636 lines
18 KiB
C
636 lines
18 KiB
C
/*
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* Copyright IBM Corp. 1999, 2009
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*/
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#define KMSG_COMPONENT "dasd-fba"
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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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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 struct ccw_driver dasd_fba_driver; /* see below */
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static int
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dasd_fba_probe(struct ccw_device *cdev)
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{
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return dasd_generic_probe(cdev, &dasd_fba_discipline);
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}
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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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},
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.ids = dasd_fba_ids,
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.probe = dasd_fba_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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.freeze = dasd_generic_pm_freeze,
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.thaw = dasd_generic_restore_device,
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.restore = dasd_generic_restore_device,
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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_block *block;
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struct dasd_fba_private *private;
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struct ccw_device *cdev = device->cdev;
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int rc;
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int readonly;
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private = (struct dasd_fba_private *) device->private;
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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 = (void *) 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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device->path_data.opm = 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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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;
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int sb, rc;
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private = (struct dasd_fba_private *) block->base->private;
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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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static struct dasd_ccw_req *dasd_fba_build_cp(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;
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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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private = (struct dasd_fba_private *) block->base->private;
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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 defined(CONFIG_64BIT)
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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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#endif
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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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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 = page_address(bv->bv_page) + bv->bv_offset;
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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;
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locate_record(ccw, LO_data++,
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rq_data_dir(req),
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recid - first_rec, 1);
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ccw->flags = CCW_FLAG_CC;
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ccw++;
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} else {
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if (recid > first_rec)
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ccw[-1].flags |= CCW_FLAG_DC;
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else
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ccw[-1].flags |= CCW_FLAG_CC;
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}
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ccw->cmd_code = cmd;
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ccw->count = block->bp_block;
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if (idal_is_needed(dst, blksize)) {
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ccw->cda = (__u32)(addr_t) idaws;
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ccw->flags = CCW_FLAG_IDA;
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idaws = idal_create_words(idaws, dst, blksize);
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} else {
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ccw->cda = (__u32)(addr_t) dst;
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ccw->flags = 0;
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}
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ccw++;
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dst += blksize;
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recid++;
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}
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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 int
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dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
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{
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struct dasd_fba_private *private;
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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, *cda;
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unsigned int blksize, off;
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int status;
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if (!dasd_page_cache)
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goto out;
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private = (struct dasd_fba_private *) cqr->block->base->private;
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blksize = cqr->block->bp_block;
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ccw = cqr->cpaddr;
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/* Skip over define extent & locate record. */
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ccw++;
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if (private->rdc_data.mode.bits.data_chain != 0)
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ccw++;
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rq_for_each_segment(bv, req, iter) {
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dst = page_address(bv->bv_page) + bv->bv_offset;
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for (off = 0; off < bv->bv_len; off += blksize) {
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/* Skip locate record. */
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if (private->rdc_data.mode.bits.data_chain == 0)
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ccw++;
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if (dst) {
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if (ccw->flags & CCW_FLAG_IDA)
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cda = *((char **)((addr_t) ccw->cda));
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else
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cda = (char *)((addr_t) ccw->cda);
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if (dst != cda) {
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if (rq_data_dir(req) == READ)
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memcpy(dst, cda, bv->bv_len);
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kmem_cache_free(dasd_page_cache,
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(void *)((addr_t)cda & PAGE_MASK));
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}
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dst = NULL;
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}
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ccw++;
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}
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}
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out:
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status = cqr->status == DASD_CQR_DONE;
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dasd_sfree_request(cqr, cqr->memdev);
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return status;
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}
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static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
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{
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if (cqr->retries < 0)
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cqr->status = DASD_CQR_FAILED;
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else
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cqr->status = DASD_CQR_FILLED;
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};
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static int
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dasd_fba_fill_info(struct dasd_device * device,
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struct dasd_information2_t * info)
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{
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info->label_block = 1;
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info->FBA_layout = 1;
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info->format = DASD_FORMAT_LDL;
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info->characteristics_size = sizeof(struct dasd_fba_characteristics);
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memcpy(info->characteristics,
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&((struct dasd_fba_private *) device->private)->rdc_data,
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sizeof (struct dasd_fba_characteristics));
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info->confdata_size = 0;
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return 0;
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}
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static void
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dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
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char *reason)
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{
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u64 *sense;
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sense = (u64 *) dasd_get_sense(irb);
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if (sense) {
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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);
|
|
}
|
|
|
|
/*
|
|
* max_blocks is dependent on the amount of storage that is available
|
|
* in the static io buffer for each device. Currently each device has
|
|
* 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
|
|
* 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
|
|
* up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
|
|
* addition we have one define extent ccw + 16 bytes of data and a
|
|
* locate record ccw for each block (stupid devices!) + 16 bytes of data.
|
|
* That makes:
|
|
* (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
|
|
* We want to fit two into the available memory so that we can immediately
|
|
* start the next request if one finishes off. That makes 100.1 blocks
|
|
* for one request. Give a little safety and the result is 96.
|
|
*/
|
|
static struct dasd_discipline dasd_fba_discipline = {
|
|
.owner = THIS_MODULE,
|
|
.name = "FBA ",
|
|
.ebcname = "FBA ",
|
|
.max_blocks = 96,
|
|
.check_device = dasd_fba_check_characteristics,
|
|
.do_analysis = dasd_fba_do_analysis,
|
|
.verify_path = dasd_generic_verify_path,
|
|
.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);
|
|
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);
|
|
}
|
|
|
|
module_init(dasd_fba_init);
|
|
module_exit(dasd_fba_cleanup);
|