blob: 4e7b55a14b1a46d40920fde48460fa2400c46f84 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Horst Hummel <Horst.Hummel@de.ibm.com>
* Carsten Otte <Cotte@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* Copyright IBM Corp. 1999, 2009
* EMC Symmetrix ioctl Copyright EMC Corporation, 2008
* Author.........: Nigel Hislop <hislop_nigel@emc.com>
*/
#define KMSG_COMPONENT "dasd-eckd"
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hdreg.h> /* HDIO_GETGEO */
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/compat.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <asm/css_chars.h>
#include <asm/debug.h>
#include <asm/idals.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <asm/cio.h>
#include <asm/ccwdev.h>
#include <asm/itcw.h>
#include <asm/schid.h>
#include <asm/chpid.h>
#include "dasd_int.h"
#include "dasd_eckd.h"
#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif /* PRINTK_HEADER */
#define PRINTK_HEADER "dasd(eckd):"
#define ECKD_C0(i) (i->home_bytes)
#define ECKD_F(i) (i->formula)
#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
(i->factors.f_0x02.f1))
#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
(i->factors.f_0x02.f2))
#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
(i->factors.f_0x02.f3))
#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
#define ECKD_F6(i) (i->factor6)
#define ECKD_F7(i) (i->factor7)
#define ECKD_F8(i) (i->factor8)
/*
* raw track access always map to 64k in memory
* so it maps to 16 blocks of 4k per track
*/
#define DASD_RAW_BLOCK_PER_TRACK 16
#define DASD_RAW_BLOCKSIZE 4096
/* 64k are 128 x 512 byte sectors */
#define DASD_RAW_SECTORS_PER_TRACK 128
MODULE_LICENSE("GPL");
static struct dasd_discipline dasd_eckd_discipline;
/* The ccw bus type uses this table to find devices that it sends to
* dasd_eckd_probe */
static struct ccw_device_id dasd_eckd_ids[] = {
{ CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
{ CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
{ CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
{ CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
{ CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
{ CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
{ CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
{ CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
{ CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
static struct ccw_driver dasd_eckd_driver; /* see below */
static void *rawpadpage;
#define INIT_CQR_OK 0
#define INIT_CQR_UNFORMATTED 1
#define INIT_CQR_ERROR 2
/* emergency request for reserve/release */
static struct {
struct dasd_ccw_req cqr;
struct ccw1 ccw;
char data[32];
} *dasd_reserve_req;
static DEFINE_MUTEX(dasd_reserve_mutex);
/* definitions for the path verification worker */
struct path_verification_work_data {
struct work_struct worker;
struct dasd_device *device;
struct dasd_ccw_req cqr;
struct ccw1 ccw;
__u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
int isglobal;
__u8 tbvpm;
};
static struct path_verification_work_data *path_verification_worker;
static DEFINE_MUTEX(dasd_path_verification_mutex);
struct check_attention_work_data {
struct work_struct worker;
struct dasd_device *device;
__u8 lpum;
};
static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
struct dasd_device *, struct dasd_device *,
unsigned int, int, unsigned int, unsigned int,
unsigned int, unsigned int);
/* initial attempt at a probe function. this can be simplified once
* the other detection code is gone */
static int
dasd_eckd_probe (struct ccw_device *cdev)
{
int ret;
/* set ECKD specific ccw-device options */
ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
if (ret) {
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
"dasd_eckd_probe: could not set "
"ccw-device options");
return ret;
}
ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
return ret;
}
static int
dasd_eckd_set_online(struct ccw_device *cdev)
{
return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
}
static const int sizes_trk0[] = { 28, 148, 84 };
#define LABEL_SIZE 140
/* head and record addresses of count_area read in analysis ccw */
static const int count_area_head[] = { 0, 0, 0, 0, 2 };
static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
static inline unsigned int
round_up_multiple(unsigned int no, unsigned int mult)
{
int rem = no % mult;
return (rem ? no - rem + mult : no);
}
static inline unsigned int
ceil_quot(unsigned int d1, unsigned int d2)
{
return (d1 + (d2 - 1)) / d2;
}
static unsigned int
recs_per_track(struct dasd_eckd_characteristics * rdc,
unsigned int kl, unsigned int dl)
{
int dn, kn;
switch (rdc->dev_type) {
case 0x3380:
if (kl)
return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
ceil_quot(dl + 12, 32));
else
return 1499 / (15 + ceil_quot(dl + 12, 32));
case 0x3390:
dn = ceil_quot(dl + 6, 232) + 1;
if (kl) {
kn = ceil_quot(kl + 6, 232) + 1;
return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
9 + ceil_quot(dl + 6 * dn, 34));
} else
return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
case 0x9345:
dn = ceil_quot(dl + 6, 232) + 1;
if (kl) {
kn = ceil_quot(kl + 6, 232) + 1;
return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
ceil_quot(dl + 6 * dn, 34));
} else
return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
}
return 0;
}
static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
{
geo->cyl = (__u16) cyl;
geo->head = cyl >> 16;
geo->head <<= 4;
geo->head |= head;
}
static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
int rc;
rc = get_phys_clock(&data->ep_sys_time);
/*
* Ignore return code if XRC is not supported or
* sync clock is switched off
*/
if ((rc && !private->rdc_data.facilities.XRC_supported) ||
rc == -EOPNOTSUPP || rc == -EACCES)
return 0;
/* switch on System Time Stamp - needed for XRC Support */
data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
if (ccw) {
ccw->count = sizeof(struct DE_eckd_data);
ccw->flags |= CCW_FLAG_SLI;
}
return rc;
}
static int
define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
unsigned int totrk, int cmd, struct dasd_device *device,
int blksize)
{
struct dasd_eckd_private *private = device->private;
u16 heads, beghead, endhead;
u32 begcyl, endcyl;
int rc = 0;
if (ccw) {
ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
ccw->flags = 0;
ccw->count = 16;
ccw->cda = (__u32)__pa(data);
}
memset(data, 0, sizeof(struct DE_eckd_data));
switch (cmd) {
case DASD_ECKD_CCW_READ_HOME_ADDRESS:
case DASD_ECKD_CCW_READ_RECORD_ZERO:
case DASD_ECKD_CCW_READ:
case DASD_ECKD_CCW_READ_MT:
case DASD_ECKD_CCW_READ_CKD:
case DASD_ECKD_CCW_READ_CKD_MT:
case DASD_ECKD_CCW_READ_KD:
case DASD_ECKD_CCW_READ_KD_MT:
data->mask.perm = 0x1;
data->attributes.operation = private->attrib.operation;
break;
case DASD_ECKD_CCW_READ_COUNT:
data->mask.perm = 0x1;
data->attributes.operation = DASD_BYPASS_CACHE;
break;
case DASD_ECKD_CCW_READ_TRACK:
case DASD_ECKD_CCW_READ_TRACK_DATA:
data->mask.perm = 0x1;
data->attributes.operation = private->attrib.operation;
data->blk_size = 0;
break;
case DASD_ECKD_CCW_WRITE:
case DASD_ECKD_CCW_WRITE_MT:
case DASD_ECKD_CCW_WRITE_KD:
case DASD_ECKD_CCW_WRITE_KD_MT:
data->mask.perm = 0x02;
data->attributes.operation = private->attrib.operation;
rc = set_timestamp(ccw, data, device);
break;
case DASD_ECKD_CCW_WRITE_CKD:
case DASD_ECKD_CCW_WRITE_CKD_MT:
data->attributes.operation = DASD_BYPASS_CACHE;
rc = set_timestamp(ccw, data, device);
break;
case DASD_ECKD_CCW_ERASE:
case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
data->mask.perm = 0x3;
data->mask.auth = 0x1;
data->attributes.operation = DASD_BYPASS_CACHE;
rc = set_timestamp(ccw, data, device);
break;
case DASD_ECKD_CCW_WRITE_FULL_TRACK:
data->mask.perm = 0x03;
data->attributes.operation = private->attrib.operation;
data->blk_size = 0;
break;
case DASD_ECKD_CCW_WRITE_TRACK_DATA:
data->mask.perm = 0x02;
data->attributes.operation = private->attrib.operation;
data->blk_size = blksize;
rc = set_timestamp(ccw, data, device);
break;
default:
dev_err(&device->cdev->dev,
"0x%x is not a known command\n", cmd);
break;
}
data->attributes.mode = 0x3; /* ECKD */
if ((private->rdc_data.cu_type == 0x2105 ||
private->rdc_data.cu_type == 0x2107 ||
private->rdc_data.cu_type == 0x1750)
&& !(private->uses_cdl && trk < 2))
data->ga_extended |= 0x40; /* Regular Data Format Mode */
heads = private->rdc_data.trk_per_cyl;
begcyl = trk / heads;
beghead = trk % heads;
endcyl = totrk / heads;
endhead = totrk % heads;
/* check for sequential prestage - enhance cylinder range */
if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
data->attributes.operation == DASD_SEQ_ACCESS) {
if (endcyl + private->attrib.nr_cyl < private->real_cyl)
endcyl += private->attrib.nr_cyl;
else
endcyl = (private->real_cyl - 1);
}
set_ch_t(&data->beg_ext, begcyl, beghead);
set_ch_t(&data->end_ext, endcyl, endhead);
return rc;
}
static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
unsigned int trk, unsigned int rec_on_trk,
int count, int cmd, struct dasd_device *device,
unsigned int reclen, unsigned int tlf)
{
struct dasd_eckd_private *private = device->private;
int sector;
int dn, d;
if (ccw) {
ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
ccw->flags = 0;
if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
ccw->count = 22;
else
ccw->count = 20;
ccw->cda = (__u32)__pa(data);
}
memset(data, 0, sizeof(*data));
sector = 0;
if (rec_on_trk) {
switch (private->rdc_data.dev_type) {
case 0x3390:
dn = ceil_quot(reclen + 6, 232);
d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
break;
case 0x3380:
d = 7 + ceil_quot(reclen + 12, 32);
sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
break;
}
}
data->sector = sector;
/* note: meaning of count depends on the operation
* for record based I/O it's the number of records, but for
* track based I/O it's the number of tracks
*/
data->count = count;
switch (cmd) {
case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
data->operation.orientation = 0x3;
data->operation.operation = 0x03;
break;
case DASD_ECKD_CCW_READ_HOME_ADDRESS:
data->operation.orientation = 0x3;
data->operation.operation = 0x16;
break;
case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
data->operation.orientation = 0x1;
data->operation.operation = 0x03;
data->count++;
break;
case DASD_ECKD_CCW_READ_RECORD_ZERO:
data->operation.orientation = 0x3;
data->operation.operation = 0x16;
data->count++;
break;
case DASD_ECKD_CCW_WRITE:
case DASD_ECKD_CCW_WRITE_MT:
case DASD_ECKD_CCW_WRITE_KD:
case DASD_ECKD_CCW_WRITE_KD_MT:
data->auxiliary.length_valid = 0x1;
data->length = reclen;
data->operation.operation = 0x01;
break;
case DASD_ECKD_CCW_WRITE_CKD:
case DASD_ECKD_CCW_WRITE_CKD_MT:
data->auxiliary.length_valid = 0x1;
data->length = reclen;
data->operation.operation = 0x03;
break;
case DASD_ECKD_CCW_WRITE_FULL_TRACK:
data->operation.orientation = 0x0;
data->operation.operation = 0x3F;
data->extended_operation = 0x11;
data->length = 0;
data->extended_parameter_length = 0x02;
if (data->count > 8) {
data->extended_parameter[0] = 0xFF;
data->extended_parameter[1] = 0xFF;
data->extended_parameter[1] <<= (16 - count);
} else {
data->extended_parameter[0] = 0xFF;
data->extended_parameter[0] <<= (8 - count);
data->extended_parameter[1] = 0x00;
}
data->sector = 0xFF;
break;
case DASD_ECKD_CCW_WRITE_TRACK_DATA:
data->auxiliary.length_valid = 0x1;
data->length = reclen; /* not tlf, as one might think */
data->operation.operation = 0x3F;
data->extended_operation = 0x23;
break;
case DASD_ECKD_CCW_READ:
case DASD_ECKD_CCW_READ_MT:
case DASD_ECKD_CCW_READ_KD:
case DASD_ECKD_CCW_READ_KD_MT:
data->auxiliary.length_valid = 0x1;
data->length = reclen;
data->operation.operation = 0x06;
break;
case DASD_ECKD_CCW_READ_CKD:
case DASD_ECKD_CCW_READ_CKD_MT:
data->auxiliary.length_valid = 0x1;
data->length = reclen;
data->operation.operation = 0x16;
break;
case DASD_ECKD_CCW_READ_COUNT:
data->operation.operation = 0x06;
break;
case DASD_ECKD_CCW_READ_TRACK:
data->operation.orientation = 0x1;
data->operation.operation = 0x0C;
data->extended_parameter_length = 0;
data->sector = 0xFF;
break;
case DASD_ECKD_CCW_READ_TRACK_DATA:
data->auxiliary.length_valid = 0x1;
data->length = tlf;
data->operation.operation = 0x0C;
break;
case DASD_ECKD_CCW_ERASE:
data->length = reclen;
data->auxiliary.length_valid = 0x1;
data->operation.operation = 0x0b;
break;
default:
DBF_DEV_EVENT(DBF_ERR, device,
"fill LRE unknown opcode 0x%x", cmd);
BUG();
}
set_ch_t(&data->seek_addr,
trk / private->rdc_data.trk_per_cyl,
trk % private->rdc_data.trk_per_cyl);
data->search_arg.cyl = data->seek_addr.cyl;
data->search_arg.head = data->seek_addr.head;
data->search_arg.record = rec_on_trk;
}
static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
unsigned int trk, unsigned int totrk, int cmd,
struct dasd_device *basedev, struct dasd_device *startdev,
unsigned int format, unsigned int rec_on_trk, int count,
unsigned int blksize, unsigned int tlf)
{
struct dasd_eckd_private *basepriv, *startpriv;
struct LRE_eckd_data *lredata;
struct DE_eckd_data *dedata;
int rc = 0;
basepriv = basedev->private;
startpriv = startdev->private;
dedata = &pfxdata->define_extent;
lredata = &pfxdata->locate_record;
ccw->cmd_code = DASD_ECKD_CCW_PFX;
ccw->flags = 0;
if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
ccw->count = sizeof(*pfxdata) + 2;
ccw->cda = (__u32) __pa(pfxdata);
memset(pfxdata, 0, sizeof(*pfxdata) + 2);
} else {
ccw->count = sizeof(*pfxdata);
ccw->cda = (__u32) __pa(pfxdata);
memset(pfxdata, 0, sizeof(*pfxdata));
}
/* prefix data */
if (format > 1) {
DBF_DEV_EVENT(DBF_ERR, basedev,
"PFX LRE unknown format 0x%x", format);
BUG();
return -EINVAL;
}
pfxdata->format = format;
pfxdata->base_address = basepriv->ned->unit_addr;
pfxdata->base_lss = basepriv->ned->ID;
pfxdata->validity.define_extent = 1;
/* private uid is kept up to date, conf_data may be outdated */
if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
pfxdata->validity.verify_base = 1;
if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
pfxdata->validity.verify_base = 1;
pfxdata->validity.hyper_pav = 1;
}
rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
/*
* For some commands the System Time Stamp is set in the define extent
* data when XRC is supported. The validity of the time stamp must be
* reflected in the prefix data as well.
*/
if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
if (format == 1) {
locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
basedev, blksize, tlf);
}
return rc;
}
static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
unsigned int trk, unsigned int totrk, int cmd,
struct dasd_device *basedev, struct dasd_device *startdev)
{
return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
0, 0, 0, 0, 0);
}
static void
locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
unsigned int rec_on_trk, int no_rec, int cmd,
struct dasd_device * device, int reclen)
{
struct dasd_eckd_private *private = device->private;
int sector;
int dn, d;
DBF_DEV_EVENT(DBF_INFO, device,
"Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
trk, rec_on_trk, no_rec, cmd, reclen);
ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
ccw->flags = 0;
ccw->count = 16;
ccw->cda = (__u32) __pa(data);
memset(data, 0, sizeof(struct LO_eckd_data));
sector = 0;
if (rec_on_trk) {
switch (private->rdc_data.dev_type) {
case 0x3390:
dn = ceil_quot(reclen + 6, 232);
d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
break;
case 0x3380:
d = 7 + ceil_quot(reclen + 12, 32);
sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
break;
}
}
data->sector = sector;
data->count = no_rec;
switch (cmd) {
case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
data->operation.orientation = 0x3;
data->operation.operation = 0x03;
break;
case DASD_ECKD_CCW_READ_HOME_ADDRESS:
data->operation.orientation = 0x3;
data->operation.operation = 0x16;
break;
case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
data->operation.orientation = 0x1;
data->operation.operation = 0x03;
data->count++;
break;
case DASD_ECKD_CCW_READ_RECORD_ZERO:
data->operation.orientation = 0x3;
data->operation.operation = 0x16;
data->count++;
break;
case DASD_ECKD_CCW_WRITE:
case DASD_ECKD_CCW_WRITE_MT:
case DASD_ECKD_CCW_WRITE_KD:
case DASD_ECKD_CCW_WRITE_KD_MT:
data->auxiliary.last_bytes_used = 0x1;
data->length = reclen;
data->operation.operation = 0x01;
break;
case DASD_ECKD_CCW_WRITE_CKD:
case DASD_ECKD_CCW_WRITE_CKD_MT:
data->auxiliary.last_bytes_used = 0x1;
data->length = reclen;
data->operation.operation = 0x03;
break;
case DASD_ECKD_CCW_READ:
case DASD_ECKD_CCW_READ_MT:
case DASD_ECKD_CCW_READ_KD:
case DASD_ECKD_CCW_READ_KD_MT:
data->auxiliary.last_bytes_used = 0x1;
data->length = reclen;
data->operation.operation = 0x06;
break;
case DASD_ECKD_CCW_READ_CKD:
case DASD_ECKD_CCW_READ_CKD_MT:
data->auxiliary.last_bytes_used = 0x1;
data->length = reclen;
data->operation.operation = 0x16;
break;
case DASD_ECKD_CCW_READ_COUNT:
data->operation.operation = 0x06;
break;
case DASD_ECKD_CCW_ERASE:
data->length = reclen;
data->auxiliary.last_bytes_used = 0x1;
data->operation.operation = 0x0b;
break;
default:
DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
"opcode 0x%x", cmd);
}
set_ch_t(&data->seek_addr,
trk / private->rdc_data.trk_per_cyl,
trk % private->rdc_data.trk_per_cyl);
data->search_arg.cyl = data->seek_addr.cyl;
data->search_arg.head = data->seek_addr.head;
data->search_arg.record = rec_on_trk;
}
/*
* Returns 1 if the block is one of the special blocks that needs
* to get read/written with the KD variant of the command.
* That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
* DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
* Luckily the KD variants differ only by one bit (0x08) from the
* normal variant. So don't wonder about code like:
* if (dasd_eckd_cdl_special(blk_per_trk, recid))
* ccw->cmd_code |= 0x8;
*/
static inline int
dasd_eckd_cdl_special(int blk_per_trk, int recid)
{
if (recid < 3)
return 1;
if (recid < blk_per_trk)
return 0;
if (recid < 2 * blk_per_trk)
return 1;
return 0;
}
/*
* Returns the record size for the special blocks of the cdl format.
* Only returns something useful if dasd_eckd_cdl_special is true
* for the recid.
*/
static inline int
dasd_eckd_cdl_reclen(int recid)
{
if (recid < 3)
return sizes_trk0[recid];
return LABEL_SIZE;
}
/* create unique id from private structure. */
static void create_uid(struct dasd_eckd_private *private)
{
int count;
struct dasd_uid *uid;
uid = &private->uid;
memset(uid, 0, sizeof(struct dasd_uid));
memcpy(uid->vendor, private->ned->HDA_manufacturer,
sizeof(uid->vendor) - 1);
EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
memcpy(uid->serial, private->ned->HDA_location,
sizeof(uid->serial) - 1);
EBCASC(uid->serial, sizeof(uid->serial) - 1);
uid->ssid = private->gneq->subsystemID;
uid->real_unit_addr = private->ned->unit_addr;
if (private->sneq) {
uid->type = private->sneq->sua_flags;
if (uid->type == UA_BASE_PAV_ALIAS)
uid->base_unit_addr = private->sneq->base_unit_addr;
} else {
uid->type = UA_BASE_DEVICE;
}
if (private->vdsneq) {
for (count = 0; count < 16; count++) {
sprintf(uid->vduit+2*count, "%02x",
private->vdsneq->uit[count]);
}
}
}
/*
* Generate device unique id that specifies the physical device.
*/
static int dasd_eckd_generate_uid(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
unsigned long flags;
if (!private)
return -ENODEV;
if (!private->ned || !private->gneq)
return -ENODEV;
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
create_uid(private);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
return 0;
}
static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
{
struct dasd_eckd_private *private = device->private;
unsigned long flags;
if (private) {
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
*uid = private->uid;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
return 0;
}
return -EINVAL;
}
/*
* compare device UID with data of a given dasd_eckd_private structure
* return 0 for match
*/
static int dasd_eckd_compare_path_uid(struct dasd_device *device,
struct dasd_eckd_private *private)
{
struct dasd_uid device_uid;
create_uid(private);
dasd_eckd_get_uid(device, &device_uid);
return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
}
static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
struct dasd_ccw_req *cqr,
__u8 *rcd_buffer,
__u8 lpm)
{
struct ccw1 *ccw;
/*
* buffer has to start with EBCDIC "V1.0" to show
* support for virtual device SNEQ
*/
rcd_buffer[0] = 0xE5;
rcd_buffer[1] = 0xF1;
rcd_buffer[2] = 0x4B;
rcd_buffer[3] = 0xF0;
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_RCD;
ccw->flags = 0;
ccw->cda = (__u32)(addr_t)rcd_buffer;
ccw->count = DASD_ECKD_RCD_DATA_SIZE;
cqr->magic = DASD_ECKD_MAGIC;
cqr->startdev = device;
cqr->memdev = device;
cqr->block = NULL;
cqr->expires = 10*HZ;
cqr->lpm = lpm;
cqr->retries = 256;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
}
/*
* Wakeup helper for read_conf
* if the cqr is not done and needs some error recovery
* the buffer has to be re-initialized with the EBCDIC "V1.0"
* to show support for virtual device SNEQ
*/
static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
{
struct ccw1 *ccw;
__u8 *rcd_buffer;
if (cqr->status != DASD_CQR_DONE) {
ccw = cqr->cpaddr;
rcd_buffer = (__u8 *)((addr_t) ccw->cda);
memset(rcd_buffer, 0, sizeof(*rcd_buffer));
rcd_buffer[0] = 0xE5;
rcd_buffer[1] = 0xF1;
rcd_buffer[2] = 0x4B;
rcd_buffer[3] = 0xF0;
}
dasd_wakeup_cb(cqr, data);
}
static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
struct dasd_ccw_req *cqr,
__u8 *rcd_buffer,
__u8 lpm)
{
struct ciw *ciw;
int rc;
/*
* sanity check: scan for RCD command in extended SenseID data
* some devices do not support RCD
*/
ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
return -EOPNOTSUPP;
dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
cqr->retries = 5;
cqr->callback = read_conf_cb;
rc = dasd_sleep_on_immediatly(cqr);
return rc;
}
static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
void **rcd_buffer,
int *rcd_buffer_size, __u8 lpm)
{
struct ciw *ciw;
char *rcd_buf = NULL;
int ret;
struct dasd_ccw_req *cqr;
/*
* sanity check: scan for RCD command in extended SenseID data
* some devices do not support RCD
*/
ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
ret = -EOPNOTSUPP;
goto out_error;
}
rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
if (!rcd_buf) {
ret = -ENOMEM;
goto out_error;
}
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
0, /* use rcd_buf as data ara */
device, NULL);
if (IS_ERR(cqr)) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate RCD request");
ret = -ENOMEM;
goto out_error;
}
dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
cqr->callback = read_conf_cb;
ret = dasd_sleep_on(cqr);
/*
* on success we update the user input parms
*/
dasd_sfree_request(cqr, cqr->memdev);
if (ret)
goto out_error;
*rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
*rcd_buffer = rcd_buf;
return 0;
out_error:
kfree(rcd_buf);
*rcd_buffer = NULL;
*rcd_buffer_size = 0;
return ret;
}
static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
{
struct dasd_sneq *sneq;
int i, count;
private->ned = NULL;
private->sneq = NULL;
private->vdsneq = NULL;
private->gneq = NULL;
count = private->conf_len / sizeof(struct dasd_sneq);
sneq = (struct dasd_sneq *)private->conf_data;
for (i = 0; i < count; ++i) {
if (sneq->flags.identifier == 1 && sneq->format == 1)
private->sneq = sneq;
else if (sneq->flags.identifier == 1 && sneq->format == 4)
private->vdsneq = (struct vd_sneq *)sneq;
else if (sneq->flags.identifier == 2)
private->gneq = (struct dasd_gneq *)sneq;
else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
private->ned = (struct dasd_ned *)sneq;
sneq++;
}
if (!private->ned || !private->gneq) {
private->ned = NULL;
private->sneq = NULL;
private->vdsneq = NULL;
private->gneq = NULL;
return -EINVAL;
}
return 0;
};
static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
{
struct dasd_gneq *gneq;
int i, count, found;
count = conf_len / sizeof(*gneq);
gneq = (struct dasd_gneq *)conf_data;
found = 0;
for (i = 0; i < count; ++i) {
if (gneq->flags.identifier == 2) {
found = 1;
break;
}
gneq++;
}
if (found)
return ((char *)gneq)[18] & 0x07;
else
return 0;
}
static void dasd_eckd_clear_conf_data(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
int i;
private->conf_data = NULL;
private->conf_len = 0;
for (i = 0; i < 8; i++) {
kfree(device->path[i].conf_data);
device->path[i].conf_data = NULL;
device->path[i].cssid = 0;
device->path[i].ssid = 0;
device->path[i].chpid = 0;
}
}
static int dasd_eckd_read_conf(struct dasd_device *device)
{
void *conf_data;
int conf_len, conf_data_saved;
int rc, path_err, pos;
__u8 lpm, opm;
struct dasd_eckd_private *private, path_private;
struct dasd_uid *uid;
char print_path_uid[60], print_device_uid[60];
struct channel_path_desc_fmt0 *chp_desc;
struct subchannel_id sch_id;
private = device->private;
opm = ccw_device_get_path_mask(device->cdev);
ccw_device_get_schid(device->cdev, &sch_id);
conf_data_saved = 0;
path_err = 0;
/* get configuration data per operational path */
for (lpm = 0x80; lpm; lpm>>= 1) {
if (!(lpm & opm))
continue;
rc = dasd_eckd_read_conf_lpm(device, &conf_data,
&conf_len, lpm);
if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Read configuration data returned "
"error %d", rc);
return rc;
}
if (conf_data == NULL) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"No configuration data "
"retrieved");
/* no further analysis possible */
dasd_path_add_opm(device, opm);
continue; /* no error */
}
/* save first valid configuration data */
if (!conf_data_saved) {
/* initially clear previously stored conf_data */
dasd_eckd_clear_conf_data(device);
private->conf_data = conf_data;
private->conf_len = conf_len;
if (dasd_eckd_identify_conf_parts(private)) {
private->conf_data = NULL;
private->conf_len = 0;
kfree(conf_data);
continue;
}
pos = pathmask_to_pos(lpm);
/* store per path conf_data */
device->path[pos].conf_data = conf_data;
device->path[pos].cssid = sch_id.cssid;
device->path[pos].ssid = sch_id.ssid;
chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
if (chp_desc)
device->path[pos].chpid = chp_desc->chpid;
kfree(chp_desc);
/*
* build device UID that other path data
* can be compared to it
*/
dasd_eckd_generate_uid(device);
conf_data_saved++;
} else {
path_private.conf_data = conf_data;
path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
if (dasd_eckd_identify_conf_parts(
&path_private)) {
path_private.conf_data = NULL;
path_private.conf_len = 0;
kfree(conf_data);
continue;
}
if (dasd_eckd_compare_path_uid(
device, &path_private)) {
uid = &path_private.uid;
if (strlen(uid->vduit) > 0)
snprintf(print_path_uid,
sizeof(print_path_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial,
uid->ssid, uid->real_unit_addr,
uid->vduit);
else
snprintf(print_path_uid,
sizeof(print_path_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial,
uid->ssid,
uid->real_unit_addr);
uid = &private->uid;
if (strlen(uid->vduit) > 0)
snprintf(print_device_uid,
sizeof(print_device_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial,
uid->ssid, uid->real_unit_addr,
uid->vduit);
else
snprintf(print_device_uid,
sizeof(print_device_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial,
uid->ssid,
uid->real_unit_addr);
dev_err(&device->cdev->dev,
"Not all channel paths lead to "
"the same device, path %02X leads to "
"device %s instead of %s\n", lpm,
print_path_uid, print_device_uid);
path_err = -EINVAL;
dasd_path_add_cablepm(device, lpm);
continue;
}
pos = pathmask_to_pos(lpm);
/* store per path conf_data */
device->path[pos].conf_data = conf_data;
device->path[pos].cssid = sch_id.cssid;
device->path[pos].ssid = sch_id.ssid;
chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
if (chp_desc)
device->path[pos].chpid = chp_desc->chpid;
kfree(chp_desc);
path_private.conf_data = NULL;
path_private.conf_len = 0;
}
switch (dasd_eckd_path_access(conf_data, conf_len)) {
case 0x02:
dasd_path_add_nppm(device, lpm);
break;
case 0x03:
dasd_path_add_ppm(device, lpm);
break;
}
if (!dasd_path_get_opm(device)) {
dasd_path_set_opm(device, lpm);
dasd_generic_path_operational(device);
} else {
dasd_path_add_opm(device, lpm);
}
}
return path_err;
}
static u32 get_fcx_max_data(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
int fcx_in_css, fcx_in_gneq, fcx_in_features;
int tpm, mdc;
if (dasd_nofcx)
return 0;
/* is transport mode supported? */
fcx_in_css = css_general_characteristics.fcx;
fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
fcx_in_features = private->features.feature[40] & 0x80;
tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
if (!tpm)
return 0;
mdc = ccw_device_get_mdc(device->cdev, 0);
if (mdc < 0) {
dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
return 0;
} else {
return (u32)mdc * FCX_MAX_DATA_FACTOR;
}
}
static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
{
struct dasd_eckd_private *private = device->private;
int mdc;
u32 fcx_max_data;
if (private->fcx_max_data) {
mdc = ccw_device_get_mdc(device->cdev, lpm);
if ((mdc < 0)) {
dev_warn(&device->cdev->dev,
"Detecting the maximum data size for zHPF "
"requests failed (rc=%d) for a new path %x\n",
mdc, lpm);
return mdc;
}
fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
if (fcx_max_data < private->fcx_max_data) {
dev_warn(&device->cdev->dev,
"The maximum data size for zHPF requests %u "
"on a new path %x is below the active maximum "
"%u\n", fcx_max_data, lpm,
private->fcx_max_data);
return -EACCES;
}
}
return 0;
}
static int rebuild_device_uid(struct dasd_device *device,
struct path_verification_work_data *data)
{
struct dasd_eckd_private *private = device->private;
__u8 lpm, opm = dasd_path_get_opm(device);
int rc = -ENODEV;
for (lpm = 0x80; lpm; lpm >>= 1) {
if (!(lpm & opm))
continue;
memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
memset(&data->cqr, 0, sizeof(data->cqr));
data->cqr.cpaddr = &data->ccw;
rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
data->rcd_buffer,
lpm);
if (rc) {
if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
continue;
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Read configuration data "
"returned error %d", rc);
break;
}
memcpy(private->conf_data, data->rcd_buffer,
DASD_ECKD_RCD_DATA_SIZE);
if (dasd_eckd_identify_conf_parts(private)) {
rc = -ENODEV;
} else /* first valid path is enough */
break;
}
if (!rc)
rc = dasd_eckd_generate_uid(device);
return rc;
}
static void do_path_verification_work(struct work_struct *work)
{
struct path_verification_work_data *data;
struct dasd_device *device;
struct dasd_eckd_private path_private;
struct dasd_uid *uid;
__u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
__u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
unsigned long flags;
char print_uid[60];
int rc;
data = container_of(work, struct path_verification_work_data, worker);
device = data->device;
/* delay path verification until device was resumed */
if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
schedule_work(work);
return;
}
/* check if path verification already running and delay if so */
if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
schedule_work(work);
return;
}
opm = 0;
npm = 0;
ppm = 0;
epm = 0;
hpfpm = 0;
cablepm = 0;
for (lpm = 0x80; lpm; lpm >>= 1) {
if (!(lpm & data->tbvpm))
continue;
memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
memset(&data->cqr, 0, sizeof(data->cqr));
data->cqr.cpaddr = &data->ccw;
rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
data->rcd_buffer,
lpm);
if (!rc) {
switch (dasd_eckd_path_access(data->rcd_buffer,
DASD_ECKD_RCD_DATA_SIZE)
) {
case 0x02:
npm |= lpm;
break;
case 0x03:
ppm |= lpm;
break;
}
opm |= lpm;
} else if (rc == -EOPNOTSUPP) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"path verification: No configuration "
"data retrieved");
opm |= lpm;
} else if (rc == -EAGAIN) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"path verification: device is stopped,"
" try again later");
epm |= lpm;
} else {
dev_warn(&device->cdev->dev,
"Reading device feature codes failed "
"(rc=%d) for new path %x\n", rc, lpm);
continue;
}
if (verify_fcx_max_data(device, lpm)) {
opm &= ~lpm;
npm &= ~lpm;
ppm &= ~lpm;
hpfpm |= lpm;
continue;
}
/*
* save conf_data for comparison after
* rebuild_device_uid may have changed
* the original data
*/
memcpy(&path_rcd_buf, data->rcd_buffer,
DASD_ECKD_RCD_DATA_SIZE);
path_private.conf_data = (void *) &path_rcd_buf;
path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
if (dasd_eckd_identify_conf_parts(&path_private)) {
path_private.conf_data = NULL;
path_private.conf_len = 0;
continue;
}
/*
* compare path UID with device UID only if at least
* one valid path is left
* in other case the device UID may have changed and
* the first working path UID will be used as device UID
*/
if (dasd_path_get_opm(device) &&
dasd_eckd_compare_path_uid(device, &path_private)) {
/*
* the comparison was not successful
* rebuild the device UID with at least one
* known path in case a z/VM hyperswap command
* has changed the device
*
* after this compare again
*
* if either the rebuild or the recompare fails
* the path can not be used
*/
if (rebuild_device_uid(device, data) ||
dasd_eckd_compare_path_uid(
device, &path_private)) {
uid = &path_private.uid;
if (strlen(uid->vduit) > 0)
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x.%s",
uid->vendor, uid->serial,
uid->ssid, uid->real_unit_addr,
uid->vduit);
else
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x",
uid->vendor, uid->serial,
uid->ssid,
uid->real_unit_addr);
dev_err(&device->cdev->dev,
"The newly added channel path %02X "
"will not be used because it leads "
"to a different device %s\n",
lpm, print_uid);
opm &= ~lpm;
npm &= ~lpm;
ppm &= ~lpm;
cablepm |= lpm;
continue;
}
}
/*
* There is a small chance that a path is lost again between
* above path verification and the following modification of
* the device opm mask. We could avoid that race here by using
* yet another path mask, but we rather deal with this unlikely
* situation in dasd_start_IO.
*/
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
if (!dasd_path_get_opm(device) && opm) {
dasd_path_set_opm(device, opm);
dasd_generic_path_operational(device);
} else {
dasd_path_add_opm(device, opm);
}
dasd_path_add_nppm(device, npm);
dasd_path_add_ppm(device, ppm);
dasd_path_add_tbvpm(device, epm);
dasd_path_add_cablepm(device, cablepm);
dasd_path_add_nohpfpm(device, hpfpm);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
dasd_put_device(device);
if (data->isglobal)
mutex_unlock(&dasd_path_verification_mutex);
else
kfree(data);
}
static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
{
struct path_verification_work_data *data;
data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
if (!data) {
if (mutex_trylock(&dasd_path_verification_mutex)) {
data = path_verification_worker;
data->isglobal = 1;
} else
return -ENOMEM;
} else {
memset(data, 0, sizeof(*data));
data->isglobal = 0;
}
INIT_WORK(&data->worker, do_path_verification_work);
dasd_get_device(device);
data->device = device;
data->tbvpm = lpm;
schedule_work(&data->worker);
return 0;
}
static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
{
struct dasd_eckd_private *private = device->private;
unsigned long flags;
if (!private->fcx_max_data)
private->fcx_max_data = get_fcx_max_data(device);
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
dasd_schedule_device_bh(device);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
static int dasd_eckd_read_features(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
struct dasd_psf_prssd_data *prssdp;
struct dasd_rssd_features *features;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
int rc;
memset(&private->features, 0, sizeof(struct dasd_rssd_features));
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
(sizeof(struct dasd_psf_prssd_data) +
sizeof(struct dasd_rssd_features)),
device, NULL);
if (IS_ERR(cqr)) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
"allocate initialization request");
return PTR_ERR(cqr);
}
cqr->startdev = device;
cqr->memdev = device;
cqr->block = NULL;
cqr->retries = 256;
cqr->expires = 10 * HZ;
/* Prepare for Read Subsystem Data */
prssdp = (struct dasd_psf_prssd_data *) cqr->data;
memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
prssdp->order = PSF_ORDER_PRSSD;
prssdp->suborder = 0x41; /* Read Feature Codes */
/* all other bytes of prssdp must be zero */
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_PSF;
ccw->count = sizeof(struct dasd_psf_prssd_data);
ccw->flags |= CCW_FLAG_CC;
ccw->cda = (__u32)(addr_t) prssdp;
/* Read Subsystem Data - feature codes */
features = (struct dasd_rssd_features *) (prssdp + 1);
memset(features, 0, sizeof(struct dasd_rssd_features));
ccw++;
ccw->cmd_code = DASD_ECKD_CCW_RSSD;
ccw->count = sizeof(struct dasd_rssd_features);
ccw->cda = (__u32)(addr_t) features;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
rc = dasd_sleep_on(cqr);
if (rc == 0) {
prssdp = (struct dasd_psf_prssd_data *) cqr->data;
features = (struct dasd_rssd_features *) (prssdp + 1);
memcpy(&private->features, features,
sizeof(struct dasd_rssd_features));
} else
dev_warn(&device->cdev->dev, "Reading device feature codes"
" failed with rc=%d\n", rc);
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Build CP for Perform Subsystem Function - SSC.
*/
static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
int enable_pav)
{
struct dasd_ccw_req *cqr;
struct dasd_psf_ssc_data *psf_ssc_data;
struct ccw1 *ccw;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
sizeof(struct dasd_psf_ssc_data),
device, NULL);
if (IS_ERR(cqr)) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate PSF-SSC request");
return cqr;
}
psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
psf_ssc_data->order = PSF_ORDER_SSC;
psf_ssc_data->suborder = 0xc0;
if (enable_pav) {
psf_ssc_data->suborder |= 0x08;
psf_ssc_data->reserved[0] = 0x88;
}
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_PSF;
ccw->cda = (__u32)(addr_t)psf_ssc_data;
ccw->count = 66;
cqr->startdev = device;
cqr->memdev = device;
cqr->block = NULL;
cqr->retries = 256;
cqr->expires = 10*HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
/*
* Perform Subsystem Function.
* It is necessary to trigger CIO for channel revalidation since this
* call might change behaviour of DASD devices.
*/
static int
dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
unsigned long flags)
{
struct dasd_ccw_req *cqr;
int rc;
cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
if (IS_ERR(cqr))
return PTR_ERR(cqr);
/*
* set flags e.g. turn on failfast, to prevent blocking
* the calling function should handle failed requests
*/
cqr->flags |= flags;
rc = dasd_sleep_on(cqr);
if (!rc)
/* trigger CIO to reprobe devices */
css_schedule_reprobe();
else if (cqr->intrc == -EAGAIN)
rc = -EAGAIN;
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Valide storage server of current device.
*/
static int dasd_eckd_validate_server(struct dasd_device *device,
unsigned long flags)
{
struct dasd_eckd_private *private = device->private;
int enable_pav, rc;
if (private->uid.type == UA_BASE_PAV_ALIAS ||
private->uid.type == UA_HYPER_PAV_ALIAS)
return 0;
if (dasd_nopav || MACHINE_IS_VM)
enable_pav = 0;
else
enable_pav = 1;
rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
/* may be requested feature is not available on server,
* therefore just report error and go ahead */
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
"returned rc=%d", private->uid.ssid, rc);
return rc;
}
/*
* worker to do a validate server in case of a lost pathgroup
*/
static void dasd_eckd_do_validate_server(struct work_struct *work)
{
struct dasd_device *device = container_of(work, struct dasd_device,
kick_validate);
unsigned long flags = 0;
set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
if (dasd_eckd_validate_server(device, flags)
== -EAGAIN) {
/* schedule worker again if failed */
schedule_work(&device->kick_validate);
return;
}
dasd_put_device(device);
}
static void dasd_eckd_kick_validate_server(struct dasd_device *device)
{
dasd_get_device(device);
/* exit if device not online or in offline processing */
if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
device->state < DASD_STATE_ONLINE) {
dasd_put_device(device);
return;
}
/* queue call to do_validate_server to the kernel event daemon. */
if (!schedule_work(&device->kick_validate))
dasd_put_device(device);
}
/*
* Check device characteristics.
* If the device is accessible using ECKD discipline, the device is enabled.
*/
static int
dasd_eckd_check_characteristics(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
struct dasd_block *block;
struct dasd_uid temp_uid;
int rc, i;
int readonly;
unsigned long value;
/* setup work queue for validate server*/
INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
/* setup work queue for summary unit check */
INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
if (!ccw_device_is_pathgroup(device->cdev)) {
dev_warn(&device->cdev->dev,
"A channel path group could not be established\n");
return -EIO;
}
if (!ccw_device_is_multipath(device->cdev)) {
dev_info(&device->cdev->dev,
"The DASD is not operating in multipath mode\n");
}
if (!private) {
private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
if (!private) {
dev_warn(&device->cdev->dev,
"Allocating memory for private DASD data "
"failed\n");
return -ENOMEM;
}
device->private = private;
} else {
memset(private, 0, sizeof(*private));
}
/* Invalidate status of initial analysis. */
private->init_cqr_status = -1;
/* Set default cache operations. */
private->attrib.operation = DASD_NORMAL_CACHE;
private->attrib.nr_cyl = 0;
/* Read Configuration Data */
rc = dasd_eckd_read_conf(device);
if (rc)
goto out_err1;
/* set some default values */
device->default_expires = DASD_EXPIRES;
device->default_retries = DASD_RETRIES;
device->path_thrhld = DASD_ECKD_PATH_THRHLD;
device->path_interval = DASD_ECKD_PATH_INTERVAL;
if (private->gneq) {
value = 1;
for (i = 0; i < private->gneq->timeout.value; i++)
value = 10 * value;
value = value * private->gneq->timeout.number;
/* do not accept useless values */
if (value != 0 && value <= DASD_EXPIRES_MAX)
device->default_expires = value;
}
dasd_eckd_get_uid(device, &temp_uid);
if (temp_uid.type == UA_BASE_DEVICE) {
block = dasd_alloc_block();
if (IS_ERR(block)) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"could not allocate dasd "
"block structure");
rc = PTR_ERR(block);
goto out_err1;
}
device->block = block;
block->base = device;
}
/* register lcu with alias handling, enable PAV */
rc = dasd_alias_make_device_known_to_lcu(device);
if (rc)
goto out_err2;
dasd_eckd_validate_server(device, 0);
/* device may report different configuration data after LCU setup */
rc = dasd_eckd_read_conf(device);
if (rc)
goto out_err3;
/* Read Feature Codes */
dasd_eckd_read_features(device);
/* Read Device Characteristics */
rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
&private->rdc_data, 64);
if (rc) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Read device characteristic failed, rc=%d", rc);
goto out_err3;
}
if ((device->features & DASD_FEATURE_USERAW) &&
!(private->rdc_data.facilities.RT_in_LR)) {
dev_err(&device->cdev->dev, "The storage server does not "
"support raw-track access\n");
rc = -EINVAL;
goto out_err3;
}
/* find the valid cylinder size */
if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
private->rdc_data.long_no_cyl)
private->real_cyl = private->rdc_data.long_no_cyl;
else
private->real_cyl = private->rdc_data.no_cyl;
private->fcx_max_data = get_fcx_max_data(device);
readonly = dasd_device_is_ro(device);
if (readonly)
set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
"with %d cylinders, %d heads, %d sectors%s\n",
private->rdc_data.dev_type,
private->rdc_data.dev_model,
private->rdc_data.cu_type,
private->rdc_data.cu_model.model,
private->real_cyl,
private->rdc_data.trk_per_cyl,
private->rdc_data.sec_per_trk,
readonly ? ", read-only device" : "");
return 0;
out_err3:
dasd_alias_disconnect_device_from_lcu(device);
out_err2:
dasd_free_block(device->block);
device->block = NULL;
out_err1:
kfree(private->conf_data);
kfree(device->private);
device->private = NULL;
return rc;
}
static void dasd_eckd_uncheck_device(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
int i;
if (!private)
return;
dasd_alias_disconnect_device_from_lcu(device);
private->ned = NULL;
private->sneq = NULL;
private->vdsneq = NULL;
private->gneq = NULL;
private->conf_len = 0;
for (i = 0; i < 8; i++) {
kfree(device->path[i].conf_data);
if ((__u8 *)device->path[i].conf_data ==
private->conf_data) {
private->conf_data = NULL;
private->conf_len = 0;
}
device->path[i].conf_data = NULL;
device->path[i].cssid = 0;
device->path[i].ssid = 0;
device->path[i].chpid = 0;
}
kfree(private->conf_data);
private->conf_data = NULL;
}
static struct dasd_ccw_req *
dasd_eckd_analysis_ccw(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
struct eckd_count *count_data;
struct LO_eckd_data *LO_data;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
int cplength, datasize;
int i;
cplength = 8;
datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
NULL);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
/* Define extent for the first 3 tracks. */
define_extent(ccw++, cqr->data, 0, 2,
DASD_ECKD_CCW_READ_COUNT, device, 0);
LO_data = cqr->data + sizeof(struct DE_eckd_data);
/* Locate record for the first 4 records on track 0. */
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, 0, 0, 4,
DASD_ECKD_CCW_READ_COUNT, device, 0);
count_data = private->count_area;
for (i = 0; i < 4; i++) {
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
ccw->flags = 0;
ccw->count = 8;
ccw->cda = (__u32)(addr_t) count_data;
ccw++;
count_data++;
}
/* Locate record for the first record on track 2. */
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, 2, 0, 1,
DASD_ECKD_CCW_READ_COUNT, device, 0);
/* Read count ccw. */
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
ccw->flags = 0;
ccw->count = 8;
ccw->cda = (__u32)(addr_t) count_data;
cqr->block = NULL;
cqr->startdev = device;
cqr->memdev = device;
cqr->retries = 255;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
/* differentiate between 'no record found' and any other error */
static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
{
char *sense;
if (init_cqr->status == DASD_CQR_DONE)
return INIT_CQR_OK;
else if (init_cqr->status == DASD_CQR_NEED_ERP ||
init_cqr->status == DASD_CQR_FAILED) {
sense = dasd_get_sense(&init_cqr->irb);
if (sense && (sense[1] & SNS1_NO_REC_FOUND))
return INIT_CQR_UNFORMATTED;
else
return INIT_CQR_ERROR;
} else
return INIT_CQR_ERROR;
}
/*
* This is the callback function for the init_analysis cqr. It saves
* the status of the initial analysis ccw before it frees it and kicks
* the device to continue the startup sequence. This will call
* dasd_eckd_do_analysis again (if the devices has not been marked
* for deletion in the meantime).
*/
static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
void *data)
{
struct dasd_device *device = init_cqr->startdev;
struct dasd_eckd_private *private = device->private;
private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
dasd_sfree_request(init_cqr, device);
dasd_kick_device(device);
}
static int dasd_eckd_start_analysis(struct dasd_block *block)
{
struct dasd_ccw_req *init_cqr;
init_cqr = dasd_eckd_analysis_ccw(block->base);
if (IS_ERR(init_cqr))
return PTR_ERR(init_cqr);
init_cqr->callback = dasd_eckd_analysis_callback;
init_cqr->callback_data = NULL;
init_cqr->expires = 5*HZ;
/* first try without ERP, so we can later handle unformatted
* devices as special case
*/
clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
init_cqr->retries = 0;
dasd_add_request_head(init_cqr);
return -EAGAIN;
}
static int dasd_eckd_end_analysis(struct dasd_block *block)
{
struct dasd_device *device = block->base;
struct dasd_eckd_private *private = device->private;
struct eckd_count *count_area;
unsigned int sb, blk_per_trk;
int status, i;
struct dasd_ccw_req *init_cqr;
status = private->init_cqr_status;
private->init_cqr_status = -1;
if (status == INIT_CQR_ERROR) {
/* try again, this time with full ERP */
init_cqr = dasd_eckd_analysis_ccw(device);
dasd_sleep_on(init_cqr);
status = dasd_eckd_analysis_evaluation(init_cqr);
dasd_sfree_request(init_cqr, device);
}
if (device->features & DASD_FEATURE_USERAW) {
block->bp_block = DASD_RAW_BLOCKSIZE;
blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
block->s2b_shift = 3;
goto raw;
}
if (status == INIT_CQR_UNFORMATTED) {
dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
return -EMEDIUMTYPE;
} else if (status == INIT_CQR_ERROR) {
dev_err(&device->cdev->dev,
"Detecting the DASD disk layout failed because "
"of an I/O error\n");
return -EIO;
}
private->uses_cdl = 1;
/* Check Track 0 for Compatible Disk Layout */
count_area = NULL;
for (i = 0; i < 3; i++) {
if (private->count_area[i].kl != 4 ||
private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
private->count_area[i].cyl != 0 ||
private->count_area[i].head != count_area_head[i] ||
private->count_area[i].record != count_area_rec[i]) {
private->uses_cdl = 0;
break;
}
}
if (i == 3)
count_area = &private->count_area[4];
if (private->uses_cdl == 0) {
for (i = 0; i < 5; i++) {
if ((private->count_area[i].kl != 0) ||
(private->count_area[i].dl !=
private->count_area[0].dl) ||
private->count_area[i].cyl != 0 ||
private->count_area[i].head != count_area_head[i] ||
private->count_area[i].record != count_area_rec[i])
break;
}
if (i == 5)
count_area = &private->count_area[0];
} else {
if (private->count_area[3].record == 1)
dev_warn(&device->cdev->dev,
"Track 0 has no records following the VTOC\n");
}
if (count_area != NULL && count_area->kl == 0) {
/* we found notthing violating our disk layout */
if (dasd_check_blocksize(count_area->dl) == 0)
block->bp_block = count_area->dl;
}
if (block->bp_block == 0) {
dev_warn(&device->cdev->dev,
"The disk layout of the DASD is not supported\n");
return -EMEDIUMTYPE;
}
block->s2b_shift = 0; /* bits to shift 512 to get a block */
for (sb = 512; sb < block->bp_block; sb = sb << 1)
block->s2b_shift++;
blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
raw:
block->blocks = (private->real_cyl *
private->rdc_data.trk_per_cyl *
blk_per_trk);
dev_info(&device->cdev->dev,
"DASD with %d KB/block, %d KB total size, %d KB/track, "
"%s\n", (block->bp_block >> 10),
((private->real_cyl *
private->rdc_data.trk_per_cyl *
blk_per_trk * (block->bp_block >> 9)) >> 1),
((blk_per_trk * block->bp_block) >> 10),
private->uses_cdl ?
"compatible disk layout" : "linux disk layout");
return 0;
}
static int dasd_eckd_do_analysis(struct dasd_block *block)
{
struct dasd_eckd_private *private = block->base->private;
if (private->init_cqr_status < 0)
return dasd_eckd_start_analysis(block);
else
return dasd_eckd_end_analysis(block);
}
static int dasd_eckd_basic_to_ready(struct dasd_device *device)
{
return dasd_alias_add_device(device);
};
static int dasd_eckd_online_to_ready(struct dasd_device *device)
{
if (cancel_work_sync(&device->reload_device))
dasd_put_device(device);
if (cancel_work_sync(&device->kick_validate))
dasd_put_device(device);
return 0;
};
static int dasd_eckd_basic_to_known(struct dasd_device *device)
{
return dasd_alias_remove_device(device);
};
static int
dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
{
struct dasd_eckd_private *private = block->base->private;
if (dasd_check_blocksize(block->bp_block) == 0) {
geo->sectors = recs_per_track(&private->rdc_data,
0, block->bp_block);
}
geo->cylinders = private->rdc_data.no_cyl;
geo->heads = private->rdc_data.trk_per_cyl;
return 0;
}
/*
* Build the TCW request for the format check
*/
static struct dasd_ccw_req *
dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
int enable_pav, struct eckd_count *fmt_buffer,
int rpt)
{
struct dasd_eckd_private *start_priv;
struct dasd_device *startdev = NULL;
struct tidaw *last_tidaw = NULL;
struct dasd_ccw_req *cqr;
struct itcw *itcw;
int itcw_size;
int count;
int rc;
int i;
if (enable_pav)
startdev = dasd_alias_get_start_dev(base);
if (!startdev)
startdev = base;
start_priv = startdev->private;
count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
/*
* we're adding 'count' amount of tidaw to the itcw.
* calculate the corresponding itcw_size
*/
itcw_size = itcw_calc_size(0, count, 0);
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
NULL);
if (IS_ERR(cqr))
return cqr;
start_priv->count++;
itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
if (IS_ERR(itcw)) {
rc = -EINVAL;
goto out_err;
}
cqr->cpaddr = itcw_get_tcw(itcw);
rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
sizeof(struct eckd_count),
count * sizeof(struct eckd_count), 0, rpt);
if (rc)
goto out_err;
for (i = 0; i < count; i++) {
last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
sizeof(struct eckd_count));
if (IS_ERR(last_tidaw)) {
rc = -EINVAL;
goto out_err;
}
}
last_tidaw->flags |= TIDAW_FLAGS_LAST;
itcw_finalize(itcw);
cqr->cpmode = 1;
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->basedev = base;
cqr->retries = startdev->default_retries;
cqr->expires = startdev->default_expires * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
/* Set flags to suppress output for expected errors */
set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
return cqr;
out_err:
dasd_sfree_request(cqr, startdev);
return ERR_PTR(rc);
}
/*
* Build the CCW request for the format check
*/
static struct dasd_ccw_req *
dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
int enable_pav, struct eckd_count *fmt_buffer, int rpt)
{
struct dasd_eckd_private *start_priv;
struct dasd_eckd_private *base_priv;
struct dasd_device *startdev = NULL;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
void *data;
int cplength, datasize;
int use_prefix;
int count;
int i;
if (enable_pav)
startdev = dasd_alias_get_start_dev(base);
if (!startdev)
startdev = base;
start_priv = startdev->private;
base_priv = base->private;
count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
use_prefix = base_priv->features.feature[8] & 0x01;
if (use_prefix) {
cplength = 1;
datasize = sizeof(struct PFX_eckd_data);
} else {
cplength = 2;
datasize = sizeof(struct DE_eckd_data) +
sizeof(struct LO_eckd_data);
}
cplength += count;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
startdev, NULL);
if (IS_ERR(cqr))
return cqr;
start_priv->count++;
data = cqr->data;
ccw = cqr->cpaddr;
if (use_prefix) {
prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
count, 0, 0);
} else {
define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_READ_COUNT, startdev, 0);
data += sizeof(struct DE_eckd_data);
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, data, fdata->start_unit, 0, count,
DASD_ECKD_CCW_READ_COUNT, base, 0);
}
for (i = 0; i < count; i++) {
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
ccw->flags = CCW_FLAG_SLI;
ccw->count = 8;
ccw->cda = (__u32)(addr_t) fmt_buffer;
ccw++;
fmt_buffer++;
}
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->basedev = base;
cqr->retries = DASD_RETRIES;
cqr->expires = startdev->default_expires * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
/* Set flags to suppress output for expected errors */
set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
return cqr;
}
static struct dasd_ccw_req *
dasd_eckd_build_format(struct dasd_device *base,
struct format_data_t *fdata,
int enable_pav)
{
struct dasd_eckd_private *base_priv;
struct dasd_eckd_private *start_priv;
struct dasd_device *startdev = NULL;
struct dasd_ccw_req *fcp;
struct eckd_count *ect;
struct ch_t address;
struct ccw1 *ccw;
void *data;
int rpt;
int cplength, datasize;
int i, j;
int intensity = 0;
int r0_perm;
int nr_tracks;
int use_prefix;
if (enable_pav)
startdev = dasd_alias_get_start_dev(base);
if (!startdev)
startdev = base;
start_priv = startdev->private;
base_priv = base->private;
rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
/*
* fdata->intensity is a bit string that tells us what to do:
* Bit 0: write record zero
* Bit 1: write home address, currently not supported
* Bit 2: invalidate tracks
* Bit 3: use OS/390 compatible disk layout (cdl)
* Bit 4: do not allow storage subsystem to modify record zero
* Only some bit combinations do make sense.
*/
if (fdata->intensity & 0x10) {
r0_perm = 0;
intensity = fdata->intensity & ~0x10;
} else {
r0_perm = 1;
intensity = fdata->intensity;
}
use_prefix = base_priv->features.feature[8] & 0x01;
switch (intensity) {
case 0x00: /* Normal format */
case 0x08: /* Normal format, use cdl. */
cplength = 2 + (rpt*nr_tracks);
if (use_prefix)
datasize = sizeof(struct PFX_eckd_data) +
sizeof(struct LO_eckd_data) +
rpt * nr_tracks * sizeof(struct eckd_count);
else
datasize = sizeof(struct DE_eckd_data) +
sizeof(struct LO_eckd_data) +
rpt * nr_tracks * sizeof(struct eckd_count);
break;
case 0x01: /* Write record zero and format track. */
case 0x09: /* Write record zero and format track, use cdl. */
cplength = 2 + rpt * nr_tracks;
if (use_prefix)
datasize = sizeof(struct PFX_eckd_data) +
sizeof(struct LO_eckd_data) +
sizeof(struct eckd_count) +
rpt * nr_tracks * sizeof(struct eckd_count);
else
datasize = sizeof(struct DE_eckd_data) +
sizeof(struct LO_eckd_data) +
sizeof(struct eckd_count) +
rpt * nr_tracks * sizeof(struct eckd_count);
break;
case 0x04: /* Invalidate track. */
case 0x0c: /* Invalidate track, use cdl. */
cplength = 3;
if (use_prefix)
datasize = sizeof(struct PFX_eckd_data) +
sizeof(struct LO_eckd_data) +
sizeof(struct eckd_count);
else
datasize = sizeof(struct DE_eckd_data) +
sizeof(struct LO_eckd_data) +
sizeof(struct eckd_count);
break;
default:
dev_warn(&startdev->cdev->dev,
"An I/O control call used incorrect flags 0x%x\n",
fdata->intensity);
return ERR_PTR(-EINVAL);
}
/* Allocate the format ccw request. */
fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
datasize, startdev, NULL);
if (IS_ERR(fcp))
return fcp;
start_priv->count++;
data = fcp->data;
ccw = fcp->cpaddr;
switch (intensity & ~0x08) {
case 0x00: /* Normal format. */
if (use_prefix) {
prefix(ccw++, (struct PFX_eckd_data *) data,
fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_WRITE_CKD, base, startdev);
/* grant subsystem permission to format R0 */
if (r0_perm)
((struct PFX_eckd_data *)data)
->define_extent.ga_extended |= 0x04;
data += sizeof(struct PFX_eckd_data);
} else {
define_extent(ccw++, (struct DE_eckd_data *) data,
fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
/* grant subsystem permission to format R0 */
if (r0_perm)
((struct DE_eckd_data *) data)
->ga_extended |= 0x04;
data += sizeof(struct DE_eckd_data);
}
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, (struct LO_eckd_data *) data,
fdata->start_unit, 0, rpt*nr_tracks,
DASD_ECKD_CCW_WRITE_CKD, base,
fdata->blksize);
data += sizeof(struct LO_eckd_data);
break;
case 0x01: /* Write record zero + format track. */
if (use_prefix) {
prefix(ccw++, (struct PFX_eckd_data *) data,
fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_WRITE_RECORD_ZERO,
base, startdev);
data += sizeof(struct PFX_eckd_data);
} else {
define_extent(ccw++, (struct DE_eckd_data *) data,
fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
data += sizeof(struct DE_eckd_data);
}
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, (struct LO_eckd_data *) data,
fdata->start_unit, 0, rpt * nr_tracks + 1,
DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
base->block->bp_block);
data += sizeof(struct LO_eckd_data);
break;
case 0x04: /* Invalidate track. */
if (use_prefix) {
prefix(ccw++, (struct PFX_eckd_data *) data,
fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_WRITE_CKD, base, startdev);
data += sizeof(struct PFX_eckd_data);
} else {
define_extent(ccw++, (struct DE_eckd_data *) data,
fdata->start_unit, fdata->stop_unit,
DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
data += sizeof(struct DE_eckd_data);
}
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, (struct LO_eckd_data *) data,
fdata->start_unit, 0, 1,
DASD_ECKD_CCW_WRITE_CKD, base, 8);
data += sizeof(struct LO_eckd_data);
break;
}
for (j = 0; j < nr_tracks; j++) {
/* calculate cylinder and head for the current track */
set_ch_t(&address,
(fdata->start_unit + j) /
base_priv->rdc_data.trk_per_cyl,
(fdata->start_unit + j) %
base_priv->rdc_data.trk_per_cyl);
if (intensity & 0x01) { /* write record zero */
ect = (struct eckd_count *) data;
data += sizeof(struct eckd_count);
ect->cyl = address.cyl;
ect->head = address.head;
ect->record = 0;
ect->kl = 0;
ect->dl = 8;
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
ccw->flags = CCW_FLAG_SLI;
ccw->count = 8;
ccw->cda = (__u32)(addr_t) ect;
ccw++;
}
if ((intensity & ~0x08) & 0x04) { /* erase track */
ect = (struct eckd_count *) data;
data += sizeof(struct eckd_count);
ect->cyl = address.cyl;
ect->head = address.head;
ect->record = 1;
ect->kl = 0;
ect->dl = 0;
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
ccw->flags = CCW_FLAG_SLI;
ccw->count = 8;
ccw->cda = (__u32)(addr_t) ect;
} else { /* write remaining records */
for (i = 0; i < rpt; i++) {
ect = (struct eckd_count *) data;
data += sizeof(struct eckd_count);
ect->cyl = address.cyl;
ect->head = address.head;
ect->record = i + 1;
ect->kl = 0;
ect->dl = fdata->blksize;
/*
* Check for special tracks 0-1
* when formatting CDL
*/
if ((intensity & 0x08) &&
address.cyl == 0 && address.head == 0) {
if (i < 3) {
ect->kl = 4;
ect->dl = sizes_trk0[i] - 4;
}
}
if ((intensity & 0x08) &&
address.cyl == 0 && address.head == 1) {
ect->kl = 44;
ect->dl = LABEL_SIZE - 44;
}
ccw[-1].flags |= CCW_FLAG_CC;
if (i != 0 || j == 0)
ccw->cmd_code =
DASD_ECKD_CCW_WRITE_CKD;
else
ccw->cmd_code =
DASD_ECKD_CCW_WRITE_CKD_MT;
ccw->flags = CCW_FLAG_SLI;
ccw->count = 8;
ccw->cda = (__u32)(addr_t) ect;
ccw++;
}
}
}
fcp->startdev = startdev;
fcp->memdev = startdev;
fcp->basedev = base;
fcp->retries = 256;
fcp->expires = startdev->default_expires * HZ;
fcp->buildclk = get_tod_clock();
fcp->status = DASD_CQR_FILLED;
return fcp;
}
/*
* Wrapper function to build a CCW request depending on input data
*/
static struct dasd_ccw_req *
dasd_eckd_format_build_ccw_req(struct dasd_device *base,
struct format_data_t *fdata, int enable_pav,
int tpm, struct eckd_count *fmt_buffer, int rpt)
{
struct dasd_ccw_req *ccw_req;
if (!fmt_buffer) {
ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
} else {
if (tpm)
ccw_req = dasd_eckd_build_check_tcw(base, fdata,
enable_pav,
fmt_buffer, rpt);
else
ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
fmt_buffer, rpt);
}
return ccw_req;
}
/*
* Sanity checks on format_data
*/
static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
struct format_data_t *fdata)
{
struct dasd_eckd_private *private = base->private;
if (fdata->start_unit >=
(private->real_cyl * private->rdc_data.trk_per_cyl)) {
dev_warn(&base->cdev->dev,
"Start track number %u used in formatting is too big\n",
fdata->start_unit);
return -EINVAL;
}
if (fdata->stop_unit >=
(private->real_cyl * private->rdc_data.trk_per_cyl)) {
dev_warn(&base->cdev->dev,
"Stop track number %u used in formatting is too big\n",
fdata->stop_unit);
return -EINVAL;
}
if (fdata->start_unit > fdata->stop_unit) {
dev_warn(&base->cdev->dev,
"Start track %u used in formatting exceeds end track\n",
fdata->start_unit);
return -EINVAL;
}
if (dasd_check_blocksize(fdata->blksize) != 0) {
dev_warn(&base->cdev->dev,
"The DASD cannot be formatted with block size %u\n",
fdata->blksize);
return -EINVAL;
}
return 0;
}
/*
* This function will process format_data originally coming from an IOCTL
*/
static int dasd_eckd_format_process_data(struct dasd_device *base,
struct format_data_t *fdata,
int enable_pav, int tpm,
struct eckd_count *fmt_buffer, int rpt,
struct irb *irb)
{
struct dasd_eckd_private *private = base->private;
struct dasd_ccw_req *cqr, *n;
struct list_head format_queue;
struct dasd_device *device;
char *sense = NULL;
int old_start, old_stop, format_step;
int step, retry;
int rc;
rc = dasd_eckd_format_sanity_checks(base, fdata);
if (rc)
return rc;
INIT_LIST_HEAD(&format_queue);
old_start = fdata->start_unit;
old_stop = fdata->stop_unit;
if (!tpm && fmt_buffer != NULL) {
/* Command Mode / Format Check */
format_step = 1;