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linux/drivers/s390/block/dasd_eckd.c
Jan Höppner 9d2be0c1d4 s390/dasd: Make raw I/O usable without prefix support 
The Prefix CCW is not mandatory and raw I/O can also be issued without
it. Check whether the Prefix CCW is supported and if not use the
combination of Define Extent and Locate Record Extended instead.

While at it, sort the variable declarations, replace the gotos with
early exits, and remove an error check at the end which is irrelevant.
Also, remove the XRC check as it is not relevant for raw I/O.

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-05 07:35:29 +02:00

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/*
* 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 check_XRC(struct ccw1 *ccw, struct DE_eckd_data *data,
struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
int rc;
if (!private->rdc_data.facilities.XRC_supported)
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' */
rc = get_phys_clock(&data->ep_sys_time);
/* Ignore return code if sync clock is switched off. */
if (rc == -EOPNOTSUPP || rc == -EACCES)
rc = 0;
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 = check_XRC(ccw, data, device);
break;
case DASD_ECKD_CCW_WRITE_CKD:
case DASD_ECKD_CCW_WRITE_CKD_MT:
data->attributes.operation = DASD_BYPASS_CACHE;
rc = check_XRC(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 = check_XRC(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 = check_XRC(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_DEVICE) {
pfxdata->validity.verify_base = 1;
if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
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);
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 *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);
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);
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;
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);
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)
{
cancel_work_sync(&device->reload_device);
cancel_work_sync(&device->kick_validate);
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);
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);
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);
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;
} else if (tpm && fmt_buffer != NULL) {
/* Transport Mode / Format Check */
format_step = DASD_CQR_MAX_CCW / rpt;
} else {
/* Normal Formatting */
format_step = DASD_CQR_MAX_CCW /
recs_per_track(&private->rdc_data, 0, fdata->blksize);
}
do {
retry = 0;
while (fdata->start_unit <= old_stop) {
step = fdata->stop_unit - fdata->start_unit + 1;
if (step > format_step) {
fdata->stop_unit =
fdata->start_unit + format_step - 1;
}
cqr = dasd_eckd_format_build_ccw_req(base, fdata,
enable_pav, tpm,
fmt_buffer, rpt);
if (IS_ERR(cqr)) {
rc = PTR_ERR(cqr);
if (rc == -ENOMEM) {
if (list_empty(&format_queue))
goto out;
/*
* not enough memory available, start
* requests retry after first requests
* were finished
*/
retry = 1;
break;
}
goto out_err;
}
list_add_tail(&cqr->blocklist, &format_queue);
if (fmt_buffer) {
step = fdata->stop_unit - fdata->start_unit + 1;
fmt_buffer += rpt * step;
}
fdata->start_unit = fdata->stop_unit + 1;
fdata->stop_unit = old_stop;
}
rc = dasd_sleep_on_queue(&format_queue);
out_err:
list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
device = cqr->startdev;
private = device->private;
if (cqr->status == DASD_CQR_FAILED) {
/*
* Only get sense data if called by format
* check
*/
if (fmt_buffer && irb) {
sense = dasd_get_sense(&cqr->irb);
memcpy(irb, &cqr->irb, sizeof(*irb));
}
rc = -EIO;
}
list_del_init(&cqr->blocklist);
dasd_sfree_request(cqr, device);
private->count--;
}
if (rc && rc != -EIO)
goto out;
if (rc == -EIO) {
/*
* In case fewer than the expected records are on the
* track, we will most likely get a 'No Record Found'
* error (in command mode) or a 'File Protected' error
* (in transport mode). Those particular cases shouldn't
* pass the -EIO to the IOCTL, therefore reset the rc
* and continue.
*/
if (sense &&
(sense[1] & SNS1_NO_REC_FOUND ||
sense[1] & SNS1_FILE_PROTECTED))
retry = 1;
else
goto out;
}
} while (retry);
out:
fdata->start_unit = old_start;
fdata->stop_unit = old_stop;
return rc;
}
static int dasd_eckd_format_device(struct dasd_device *base,
struct format_data_t *fdata, int enable_pav)
{
return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
0, NULL);
}
/*
* Helper function to count consecutive records of a single track.
*/
static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
int max)
{
int head;
int i;
head = fmt_buffer[start].head;
/*
* There are 3 conditions where we stop counting:
* - if data reoccurs (same head and record may reoccur), which may
* happen due to the way DASD_ECKD_CCW_READ_COUNT works
* - when the head changes, because we're iterating over several tracks
* then (DASD_ECKD_CCW_READ_COUNT_MT)
* - when we've reached the end of sensible data in the buffer (the
* record will be 0 then)
*/
for (i = start; i < max; i++) {
if (i > start) {
if ((fmt_buffer[i].head == head &&
fmt_buffer[i].record == 1) ||
fmt_buffer[i].head != head ||
fmt_buffer[i].record == 0)
break;
}
}
return i - start;
}
/*
* Evaluate a given range of tracks. Data like number of records, blocksize,
* record ids, and key length are compared with expected data.
*
* If a mismatch occurs, the corresponding error bit is set, as well as
* additional information, depending on the error.
*/
static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
struct format_check_t *cdata,
int rpt_max, int rpt_exp,
int trk_per_cyl, int tpm)
{
struct ch_t geo;
int max_entries;
int count = 0;
int trkcount;
int blksize;
int pos = 0;
int i, j;
int kl;
trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
max_entries = trkcount * rpt_max;
for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
/* Calculate the correct next starting position in the buffer */
if (tpm) {
while (fmt_buffer[pos].record == 0 &&
fmt_buffer[pos].dl == 0) {
if (pos++ > max_entries)
break;
}
} else {
if (i != cdata->expect.start_unit)
pos += rpt_max - count;
}
/* Calculate the expected geo values for the current track */
set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
/* Count and check number of records */
count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
if (count < rpt_exp) {
cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
break;
}
if (count > rpt_exp) {
cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
break;
}
for (j = 0; j < count; j++, pos++) {
blksize = cdata->expect.blksize;
kl = 0;
/*
* Set special values when checking CDL formatted
* devices.
*/
if ((cdata->expect.intensity & 0x08) &&
geo.cyl == 0 && geo.head == 0) {
if (j < 3) {
blksize = sizes_trk0[j] - 4;
kl = 4;
}
}
if ((cdata->expect.intensity & 0x08) &&
geo.cyl == 0 && geo.head == 1) {
blksize = LABEL_SIZE - 44;
kl = 44;
}
/* Check blocksize */
if (fmt_buffer[pos].dl != blksize) {
cdata->result = DASD_FMT_ERR_BLKSIZE;
goto out;
}
/* Check if key length is 0 */
if (fmt_buffer[pos].kl != kl) {
cdata->result = DASD_FMT_ERR_KEY_LENGTH;
goto out;
}
/* Check if record_id is correct */
if (fmt_buffer[pos].cyl != geo.cyl ||
fmt_buffer[pos].head != geo.head ||
fmt_buffer[pos].record != (j + 1)) {
cdata->result = DASD_FMT_ERR_RECORD_ID;
goto out;
}
}
}
out:
/*
* In case of no errors, we need to decrease by one
* to get the correct positions.
*/
if (!cdata->result) {
i--;
pos--;
}
cdata->unit = i;
cdata->num_records = count;
cdata->rec = fmt_buffer[pos].record;
cdata->blksize = fmt_buffer[pos].dl;
cdata->key_length = fmt_buffer[pos].kl;
}
/*
* Check the format of a range of tracks of a DASD.
*/
static int dasd_eckd_check_device_format(struct dasd_device *base,
struct format_check_t *cdata,
int enable_pav)
{
struct dasd_eckd_private *private = base->private;
struct eckd_count *fmt_buffer;
struct irb irb;
int rpt_max, rpt_exp;
int fmt_buffer_size;
int trk_per_cyl;
int trkcount;
int tpm = 0;
int rc;
trk_per_cyl = private->rdc_data.trk_per_cyl;
/* Get maximum and expected amount of records per track */
rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
if (!fmt_buffer)
return -ENOMEM;
/*
* A certain FICON feature subset is needed to operate in transport
* mode. Additionally, the support for transport mode is implicitly
* checked by comparing the buffer size with fcx_max_data. As long as
* the buffer size is smaller we can operate in transport mode and
* process multiple tracks. If not, only one track at once is being
* processed using command mode.
*/
if ((private->features.feature[40] & 0x04) &&
fmt_buffer_size <= private->fcx_max_data)
tpm = 1;
rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
tpm, fmt_buffer, rpt_max, &irb);
if (rc && rc != -EIO)
goto out;
if (rc == -EIO) {
/*
* If our first attempt with transport mode enabled comes back
* with an incorrect length error, we're going to retry the
* check with command mode.
*/
if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
tpm = 0;
rc = dasd_eckd_format_process_data(base, &cdata->expect,
enable_pav, tpm,
fmt_buffer, rpt_max,
&irb);
if (rc)
goto out;
} else {
goto out;
}
}
dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
trk_per_cyl, tpm);
out:
kfree(fmt_buffer);
return rc;
}
static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
{
if (cqr->retries < 0) {
cqr->status = DASD_CQR_FAILED;
return;
}
cqr->status = DASD_CQR_FILLED;
if (cqr->block && (cqr->startdev != cqr->block->base)) {
dasd_eckd_reset_ccw_to_base_io(cqr);
cqr->startdev = cqr->block->base;
cqr->lpm = dasd_path_get_opm(cqr->block->base);
}
};
static dasd_erp_fn_t
dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
{
struct dasd_device *device = (struct dasd_device *) cqr->startdev;
struct ccw_device *cdev = device->cdev;
switch (cdev->id.cu_type) {
case 0x3990:
case 0x2105:
case 0x2107:
case 0x1750:
return dasd_3990_erp_action;
case 0x9343:
case 0x3880:
default:
return dasd_default_erp_action;
}
}
static dasd_erp_fn_t
dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
{
return dasd_default_erp_postaction;
}
static void dasd_eckd_check_for_device_change(struct dasd_device *device,
struct dasd_ccw_req *cqr,
struct irb *irb)
{
char mask;
char *sense = NULL;
struct dasd_eckd_private *private = device->private;
/* first of all check for state change pending interrupt */
mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
if ((scsw_dstat(&irb->scsw) & mask) == mask) {
/*
* for alias only, not in offline processing
* and only if not suspended
*/
if (!device->block && private->lcu &&
device->state == DASD_STATE_ONLINE &&
!test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
!test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
/* schedule worker to reload device */
dasd_reload_device(device);
}
dasd_generic_handle_state_change(device);
return;
}
sense = dasd_get_sense(irb);
if (!sense)
return;
/* summary unit check */
if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
(scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"eckd suc: device already notified");
return;
}
sense = dasd_get_sense(irb);
if (!sense) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"eckd suc: no reason code available");
clear_bit(DASD_FLAG_SUC, &device->flags);
return;
}
private->suc_reason = sense[8];
DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
"eckd handle summary unit check: reason",
private->suc_reason);
dasd_get_device(device);
if (!schedule_work(&device->suc_work))
dasd_put_device(device);
return;
}
/* service information message SIM */
if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
dasd_3990_erp_handle_sim(device, sense);
return;
}
/* loss of device reservation is handled via base devices only
* as alias devices may be used with several bases
*/
if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
(sense[7] == 0x3F) &&
(scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
if (device->features & DASD_FEATURE_FAILONSLCK)
set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
dev_err(&device->cdev->dev,
"The device reservation was lost\n");
}
}
static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
struct dasd_device *startdev,
struct dasd_block *block,
struct request *req,
sector_t first_rec,
sector_t last_rec,
sector_t first_trk,
sector_t last_trk,
unsigned int first_offs,
unsigned int last_offs,
unsigned int blk_per_trk,
unsigned int blksize)
{
struct dasd_eckd_private *private;
unsigned long *idaws;
struct LO_eckd_data *LO_data;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
struct req_iterator iter;
struct bio_vec bv;
char *dst;
unsigned int off;
int count, cidaw, cplength, datasize;
sector_t recid;
unsigned char cmd, rcmd;
int use_prefix;
struct dasd_device *basedev;
basedev = block->base;
private = basedev->private;
if (rq_data_dir(req) == READ)
cmd = DASD_ECKD_CCW_READ_MT;
else if (rq_data_dir(req) == WRITE)
cmd = DASD_ECKD_CCW_WRITE_MT;
else
return ERR_PTR(-EINVAL);
/* Check struct bio and count the number of blocks for the request. */
count = 0;
cidaw = 0;
rq_for_each_segment(bv, req, iter) {
if (bv.bv_len & (blksize - 1))
/* Eckd can only do full blocks. */
return ERR_PTR(-EINVAL);
count += bv.bv_len >> (block->s2b_shift + 9);
if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
cidaw += bv.bv_len >> (block->s2b_shift + 9);
}
/* Paranoia. */
if (count != last_rec - first_rec + 1)
return ERR_PTR(-EINVAL);
/* use the prefix command if available */
use_prefix = private->features.feature[8] & 0x01;
if (use_prefix) {
/* 1x prefix + number of blocks */
cplength = 2 + count;
/* 1x prefix + cidaws*sizeof(long) */
datasize = sizeof(struct PFX_eckd_data) +
sizeof(struct LO_eckd_data) +
cidaw * sizeof(unsigned long);
} else {
/* 1x define extent + 1x locate record + number of blocks */
cplength = 2 + count;
/* 1x define extent + 1x locate record + cidaws*sizeof(long) */
datasize = sizeof(struct DE_eckd_data) +
sizeof(struct LO_eckd_data) +
cidaw * sizeof(unsigned long);
}
/* Find out the number of additional locate record ccws for cdl. */
if (private->uses_cdl && first_rec < 2*blk_per_trk) {
if (last_rec >= 2*blk_per_trk)
count = 2*blk_per_trk - first_rec;
cplength += count;
datasize += count*sizeof(struct LO_eckd_data);
}
/* Allocate the ccw request. */
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
startdev);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
/* First ccw is define extent or prefix. */
if (use_prefix) {
if (prefix(ccw++, cqr->data, first_trk,
last_trk, cmd, basedev, startdev) == -EAGAIN) {
/* Clock not in sync and XRC is enabled.
* Try again later.
*/
dasd_sfree_request(cqr, startdev);
return ERR_PTR(-EAGAIN);
}
idaws = (unsigned long *) (cqr->data +
sizeof(struct PFX_eckd_data));
} else {
if (define_extent(ccw++, cqr->data, first_trk,
last_trk, cmd, basedev, 0) == -EAGAIN) {
/* Clock not in sync and XRC is enabled.
* Try again later.
*/
dasd_sfree_request(cqr, startdev);
return ERR_PTR(-EAGAIN);
}
idaws = (unsigned long *) (cqr->data +
sizeof(struct DE_eckd_data));
}
/* Build locate_record+read/write/ccws. */
LO_data = (struct LO_eckd_data *) (idaws + cidaw);
recid = first_rec;
if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
/* Only standard blocks so there is just one locate record. */
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
last_rec - recid + 1, cmd, basedev, blksize);
}
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
if (dasd_page_cache) {
char *copy = kmem_cache_alloc(dasd_page_cache,
GFP_DMA | __GFP_NOWARN);
if (copy && rq_data_dir(req) == WRITE)
memcpy(copy + bv.bv_offset, dst, bv.bv_len);
if (copy)
dst = copy + bv.bv_offset;
}
for (off = 0; off < bv.bv_len; off += blksize) {
sector_t trkid = recid;
unsigned int recoffs = sector_div(trkid, blk_per_trk);
rcmd = cmd;
count = blksize;
/* Locate record for cdl special block ? */
if (private->uses_cdl && recid < 2*blk_per_trk) {
if (dasd_eckd_cdl_special(blk_per_trk, recid)){
rcmd |= 0x8;
count = dasd_eckd_cdl_reclen(recid);
if (count < blksize &&
rq_data_dir(req) == READ)
memset(dst + count, 0xe5,
blksize - count);
}
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++,
trkid, recoffs + 1,
1, rcmd, basedev, count);
}
/* Locate record for standard blocks ? */
if (private->uses_cdl && recid == 2*blk_per_trk) {
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++,
trkid, recoffs + 1,
last_rec - recid + 1,
cmd, basedev, count);
}
/* Read/write ccw. */
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = rcmd;
ccw->count = count;
if (idal_is_needed(dst, blksize)) {
ccw->cda = (__u32)(addr_t) idaws;
ccw->flags = CCW_FLAG_IDA;
idaws = idal_create_words(idaws, dst, blksize);
} else {
ccw->cda = (__u32)(addr_t) dst;
ccw->flags = 0;
}
ccw++;
dst += blksize;
recid++;
}
}
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
cqr->lpm = dasd_path_get_ppm(startdev);
cqr->retries = startdev->default_retries;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
struct dasd_device *startdev,
struct dasd_block *block,
struct request *req,
sector_t first_rec,
sector_t last_rec,
sector_t first_trk,
sector_t last_trk,
unsigned int first_offs,
unsigned int last_offs,
unsigned int blk_per_trk,
unsigned int blksize)
{
unsigned long *idaws;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
struct req_iterator iter;
struct bio_vec bv;
char *dst, *idaw_dst;
unsigned int cidaw, cplength, datasize;
unsigned int tlf;
sector_t recid;
unsigned char cmd;
struct dasd_device *basedev;
unsigned int trkcount, count, count_to_trk_end;
unsigned int idaw_len, seg_len, part_len, len_to_track_end;
unsigned char new_track, end_idaw;
sector_t trkid;
unsigned int recoffs;
basedev = block->base;
if (rq_data_dir(req) == READ)
cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
else if (rq_data_dir(req) == WRITE)
cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
else
return ERR_PTR(-EINVAL);
/* Track based I/O needs IDAWs for each page, and not just for
* 64 bit addresses. We need additional idals for pages
* that get filled from two tracks, so we use the number
* of records as upper limit.
*/
cidaw = last_rec - first_rec + 1;
trkcount = last_trk - first_trk + 1;
/* 1x prefix + one read/write ccw per track */
cplength = 1 + trkcount;
/* on 31-bit we need space for two 32 bit addresses per page
* on 64-bit one 64 bit address
*/
datasize = sizeof(struct PFX_eckd_data) +
cidaw * sizeof(unsigned long long);
/* Allocate the ccw request. */
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
startdev);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
/* transfer length factor: how many bytes to read from the last track */
if (first_trk == last_trk)
tlf = last_offs - first_offs + 1;
else
tlf = last_offs + 1;
tlf *= blksize;
if (prefix_LRE(ccw++, cqr->data, first_trk,
last_trk, cmd, basedev, startdev,
1 /* format */, first_offs + 1,
trkcount, blksize,
tlf) == -EAGAIN) {
/* Clock not in sync and XRC is enabled.
* Try again later.
*/
dasd_sfree_request(cqr, startdev);
return ERR_PTR(-EAGAIN);
}
/*
* The translation of request into ccw programs must meet the
* following conditions:
* - all idaws but the first and the last must address full pages
* (or 2K blocks on 31-bit)
* - the scope of a ccw and it's idal ends with the track boundaries
*/
idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
recid = first_rec;
new_track = 1;
end_idaw = 0;
len_to_track_end = 0;
idaw_dst = NULL;
idaw_len = 0;
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
seg_len = bv.bv_len;
while (seg_len) {
if (new_track) {
trkid = recid;
recoffs = sector_div(trkid, blk_per_trk);
count_to_trk_end = blk_per_trk - recoffs;
count = min((last_rec - recid + 1),
(sector_t)count_to_trk_end);
len_to_track_end = count * blksize;
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = cmd;
ccw->count = len_to_track_end;
ccw->cda = (__u32)(addr_t)idaws;
ccw->flags = CCW_FLAG_IDA;
ccw++;
recid += count;
new_track = 0;
/* first idaw for a ccw may start anywhere */
if (!idaw_dst)
idaw_dst = dst;
}
/* If we start a new idaw, we must make sure that it
* starts on an IDA_BLOCK_SIZE boundary.
* If we continue an idaw, we must make sure that the
* current segment begins where the so far accumulated
* idaw ends
*/
if (!idaw_dst) {
if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
dasd_sfree_request(cqr, startdev);
return ERR_PTR(-ERANGE);
} else
idaw_dst = dst;
}
if ((idaw_dst + idaw_len) != dst) {
dasd_sfree_request(cqr, startdev);
return ERR_PTR(-ERANGE);
}
part_len = min(seg_len, len_to_track_end);
seg_len -= part_len;
dst += part_len;
idaw_len += part_len;
len_to_track_end -= part_len;
/* collected memory area ends on an IDA_BLOCK border,
* -> create an idaw
* idal_create_words will handle cases where idaw_len
* is larger then IDA_BLOCK_SIZE
*/
if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
end_idaw = 1;
/* We also need to end the idaw at track end */
if (!len_to_track_end) {
new_track = 1;
end_idaw = 1;
}
if (end_idaw) {
idaws = idal_create_words(idaws, idaw_dst,
idaw_len);
idaw_dst = NULL;
idaw_len = 0;
end_idaw = 0;
}
}
}
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
cqr->lpm = dasd_path_get_ppm(startdev);
cqr->retries = startdev->default_retries;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static int prepare_itcw(struct itcw *itcw,
unsigned int trk, unsigned int totrk, int cmd,
struct dasd_device *basedev,
struct dasd_device *startdev,
unsigned int rec_on_trk, int count,
unsigned int blksize,
unsigned int total_data_size,
unsigned int tlf,
unsigned int blk_per_trk)
{
struct PFX_eckd_data pfxdata;
struct dasd_eckd_private *basepriv, *startpriv;
struct DE_eckd_data *dedata;
struct LRE_eckd_data *lredata;
struct dcw *dcw;
u32 begcyl, endcyl;
u16 heads, beghead, endhead;
u8 pfx_cmd;
int rc = 0;
int sector = 0;
int dn, d;
/* setup prefix data */
basepriv = basedev->private;
startpriv = startdev->private;
dedata = &pfxdata.define_extent;
lredata = &pfxdata.locate_record;
memset(&pfxdata, 0, sizeof(pfxdata));
pfxdata.format = 1; /* PFX with LRE */
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_DEVICE) {
pfxdata.validity.verify_base = 1;
if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
pfxdata.validity.hyper_pav = 1;
}
switch (cmd) {
case DASD_ECKD_CCW_READ_TRACK_DATA:
dedata->mask.perm = 0x1;
dedata->attributes.operation = basepriv->attrib.operation;
dedata->blk_size = blksize;
dedata->ga_extended |= 0x42;
lredata->operation.orientation = 0x0;
lredata->operation.operation = 0x0C;
lredata->auxiliary.check_bytes = 0x01;
pfx_cmd = DASD_ECKD_CCW_PFX_READ;
break;
case DASD_ECKD_CCW_WRITE_TRACK_DATA:
dedata->mask.perm = 0x02;
dedata->attributes.operation = basepriv->attrib.operation;
dedata->blk_size = blksize;
rc = check_XRC(NULL, dedata, basedev);
dedata->ga_extended |= 0x42;
lredata->operation.orientation = 0x0;
lredata->operation.operation = 0x3F;
lredata->extended_operation = 0x23;
lredata->auxiliary.check_bytes = 0x2;
/*
* If XRC is supported the System Time Stamp is set. 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' */
pfx_cmd = DASD_ECKD_CCW_PFX;
break;
case DASD_ECKD_CCW_READ_COUNT_MT:
dedata->mask.perm = 0x1;
dedata->attributes.operation = DASD_BYPASS_CACHE;
dedata->ga_extended |= 0x42;
dedata->blk_size = blksize;
lredata->operation.orientation = 0x2;
lredata->operation.operation = 0x16;
lredata->auxiliary.check_bytes = 0x01;
pfx_cmd = DASD_ECKD_CCW_PFX_READ;
break;
default:
DBF_DEV_EVENT(DBF_ERR, basedev,
"prepare itcw, unknown opcode 0x%x", cmd);
BUG();
break;
}
if (rc)
return rc;
dedata->attributes.mode = 0x3; /* ECKD */
heads = basepriv->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 (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
dedata->attributes.operation == DASD_SEQ_ACCESS) {
if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
endcyl += basepriv->attrib.nr_cyl;
else
endcyl = (basepriv->real_cyl - 1);
}
set_ch_t(&dedata->beg_ext, begcyl, beghead);
set_ch_t(&dedata->end_ext, endcyl, endhead);
dedata->ep_format = 0x20; /* records per track is valid */
dedata->ep_rec_per_track = blk_per_trk;
if (rec_on_trk) {
switch (basepriv->rdc_data.dev_type) {
case 0x3390:
dn = ceil_quot(blksize + 6, 232);
d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
break;
case 0x3380:
d = 7 + ceil_quot(blksize + 12, 32);
sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
break;
}
}
if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
lredata->auxiliary.length_valid = 0;
lredata->auxiliary.length_scope = 0;
lredata->sector = 0xff;
} else {
lredata->auxiliary.length_valid = 1;
lredata->auxiliary.length_scope = 1;
lredata->sector = sector;
}
lredata->auxiliary.imbedded_ccw_valid = 1;
lredata->length = tlf;
lredata->imbedded_ccw = cmd;
lredata->count = count;
set_ch_t(&lredata->seek_addr, begcyl, beghead);
lredata->search_arg.cyl = lredata->seek_addr.cyl;
lredata->search_arg.head = lredata->seek_addr.head;
lredata->search_arg.record = rec_on_trk;
dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
&pfxdata, sizeof(pfxdata), total_data_size);
return PTR_RET(dcw);
}
static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
struct dasd_device *startdev,
struct dasd_block *block,
struct request *req,
sector_t first_rec,
sector_t last_rec,
sector_t first_trk,
sector_t last_trk,
unsigned int first_offs,
unsigned int last_offs,
unsigned int blk_per_trk,
unsigned int blksize)
{
struct dasd_ccw_req *cqr;
struct req_iterator iter;
struct bio_vec bv;
char *dst;
unsigned int trkcount, ctidaw;
unsigned char cmd;
struct dasd_device *basedev;
unsigned int tlf;
struct itcw *itcw;
struct tidaw *last_tidaw = NULL;
int itcw_op;
size_t itcw_size;
u8 tidaw_flags;
unsigned int seg_len, part_len, len_to_track_end;
unsigned char new_track;
sector_t recid, trkid;
unsigned int offs;
unsigned int count, count_to_trk_end;
int ret;
basedev = block->base;
if (rq_data_dir(req) == READ) {
cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
itcw_op = ITCW_OP_READ;
} else if (rq_data_dir(req) == WRITE) {
cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
itcw_op = ITCW_OP_WRITE;
} else
return ERR_PTR(-EINVAL);
/* trackbased I/O needs address all memory via TIDAWs,
* not just for 64 bit addresses. This allows us to map
* each segment directly to one tidaw.
* In the case of write requests, additional tidaws may
* be needed when a segment crosses a track boundary.
*/
trkcount = last_trk - first_trk + 1;
ctidaw = 0;
rq_for_each_segment(bv, req, iter) {
++ctidaw;
}
if (rq_data_dir(req) == WRITE)
ctidaw += (last_trk - first_trk);
/* Allocate the ccw request. */
itcw_size = itcw_calc_size(0, ctidaw, 0);
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
if (IS_ERR(cqr))
return cqr;
/* transfer length factor: how many bytes to read from the last track */
if (first_trk == last_trk)
tlf = last_offs - first_offs + 1;
else
tlf = last_offs + 1;
tlf *= blksize;
itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
if (IS_ERR(itcw)) {
ret = -EINVAL;
goto out_error;
}
cqr->cpaddr = itcw_get_tcw(itcw);
if (prepare_itcw(itcw, first_trk, last_trk,
cmd, basedev, startdev,
first_offs + 1,
trkcount, blksize,
(last_rec - first_rec + 1) * blksize,
tlf, blk_per_trk) == -EAGAIN) {
/* Clock not in sync and XRC is enabled.
* Try again later.
*/
ret = -EAGAIN;
goto out_error;
}
len_to_track_end = 0;
/*
* A tidaw can address 4k of memory, but must not cross page boundaries
* We can let the block layer handle this by setting
* blk_queue_segment_boundary to page boundaries and
* blk_max_segment_size to page size when setting up the request queue.
* For write requests, a TIDAW must not cross track boundaries, because
* we have to set the CBC flag on the last tidaw for each track.
*/
if (rq_data_dir(req) == WRITE) {
new_track = 1;
recid = first_rec;
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
seg_len = bv.bv_len;
while (seg_len) {
if (new_track) {
trkid = recid;
offs = sector_div(trkid, blk_per_trk);
count_to_trk_end = blk_per_trk - offs;
count = min((last_rec - recid + 1),
(sector_t)count_to_trk_end);
len_to_track_end = count * blksize;
recid += count;
new_track = 0;
}
part_len = min(seg_len, len_to_track_end);
seg_len -= part_len;
len_to_track_end -= part_len;
/* We need to end the tidaw at track end */
if (!len_to_track_end) {
new_track = 1;
tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
} else
tidaw_flags = 0;
last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
dst, part_len);
if (IS_ERR(last_tidaw)) {
ret = -EINVAL;
goto out_error;
}
dst += part_len;
}
}
} else {
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
last_tidaw = itcw_add_tidaw(itcw, 0x00,
dst, bv.bv_len);
if (IS_ERR(last_tidaw)) {
ret = -EINVAL;
goto out_error;
}
}
}
last_tidaw->flags |= TIDAW_FLAGS_LAST;
last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
itcw_finalize(itcw);
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->cpmode = 1;
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
cqr->lpm = dasd_path_get_ppm(startdev);
cqr->retries = startdev->default_retries;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
out_error:
dasd_sfree_request(cqr, startdev);
return ERR_PTR(ret);
}
static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
struct dasd_block *block,
struct request *req)
{
int cmdrtd, cmdwtd;
int use_prefix;
int fcx_multitrack;
struct dasd_eckd_private *private;
struct dasd_device *basedev;
sector_t first_rec, last_rec;
sector_t first_trk, last_trk;
unsigned int first_offs, last_offs;
unsigned int blk_per_trk, blksize;
int cdlspecial;
unsigned int data_size;
struct dasd_ccw_req *cqr;
basedev = block->base;
private = basedev->private;
/* Calculate number of blocks/records per track. */
blksize = block->bp_block;
blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
if (blk_per_trk == 0)
return ERR_PTR(-EINVAL);
/* Calculate record id of first and last block. */
first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
first_offs = sector_div(first_trk, blk_per_trk);
last_rec = last_trk =
(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
last_offs = sector_div(last_trk, blk_per_trk);
cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
fcx_multitrack = private->features.feature[40] & 0x20;
data_size = blk_rq_bytes(req);
if (data_size % blksize)
return ERR_PTR(-EINVAL);
/* tpm write request add CBC data on each track boundary */
if (rq_data_dir(req) == WRITE)
data_size += (last_trk - first_trk) * 4;
/* is read track data and write track data in command mode supported? */
cmdrtd = private->features.feature[9] & 0x20;
cmdwtd = private->features.feature[12] & 0x40;
use_prefix = private->features.feature[8] & 0x01;
cqr = NULL;
if (cdlspecial || dasd_page_cache) {
/* do nothing, just fall through to the cmd mode single case */
} else if ((data_size <= private->fcx_max_data)
&& (fcx_multitrack || (first_trk == last_trk))) {
cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
first_rec, last_rec,
first_trk, last_trk,
first_offs, last_offs,
blk_per_trk, blksize);
if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
(PTR_ERR(cqr) != -ENOMEM))
cqr = NULL;
} else if (use_prefix &&
(((rq_data_dir(req) == READ) && cmdrtd) ||
((rq_data_dir(req) == WRITE) && cmdwtd))) {
cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
first_rec, last_rec,
first_trk, last_trk,
first_offs, last_offs,
blk_per_trk, blksize);
if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
(PTR_ERR(cqr) != -ENOMEM))
cqr = NULL;
}
if (!cqr)
cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
first_rec, last_rec,
first_trk, last_trk,
first_offs, last_offs,
blk_per_trk, blksize);
return cqr;
}
static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
struct dasd_block *block,
struct request *req)
{
sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
unsigned int seg_len, len_to_track_end;
unsigned int cidaw, cplength, datasize;
sector_t first_trk, last_trk, sectors;
struct dasd_eckd_private *base_priv;
struct dasd_device *basedev;
struct req_iterator iter;
struct dasd_ccw_req *cqr;
unsigned int first_offs;
unsigned int trkcount;
unsigned long *idaws;
unsigned int size;
unsigned char cmd;
struct bio_vec bv;
struct ccw1 *ccw;
int use_prefix;
void *data;
char *dst;
/*
* raw track access needs to be mutiple of 64k and on 64k boundary
* For read requests we can fix an incorrect alignment by padding
* the request with dummy pages.
*/
start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
DASD_RAW_SECTORS_PER_TRACK;
end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
DASD_RAW_SECTORS_PER_TRACK;
basedev = block->base;
if ((start_padding_sectors || end_padding_sectors) &&
(rq_data_dir(req) == WRITE)) {
DBF_DEV_EVENT(DBF_ERR, basedev,
"raw write not track aligned (%lu,%lu) req %p",
start_padding_sectors, end_padding_sectors, req);
return ERR_PTR(-EINVAL);
}
first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
DASD_RAW_SECTORS_PER_TRACK;
trkcount = last_trk - first_trk + 1;
first_offs = 0;
if (rq_data_dir(req) == READ)
cmd = DASD_ECKD_CCW_READ_TRACK;
else if (rq_data_dir(req) == WRITE)
cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
else
return ERR_PTR(-EINVAL);
/*
* Raw track based I/O needs IDAWs for each page,
* and not just for 64 bit addresses.
*/
cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
/*
* struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
* of extended parameter. This is needed for write full track.
*/
base_priv = basedev->private;
use_prefix = base_priv->features.feature[8] & 0x01;
if (use_prefix) {
cplength = 1 + trkcount;
size = sizeof(struct PFX_eckd_data) + 2;
} else {
cplength = 2 + trkcount;
size = sizeof(struct DE_eckd_data) +
sizeof(struct LRE_eckd_data) + 2;
}
size = ALIGN(size, 8);
datasize = size + cidaw * sizeof(unsigned long long);
/* Allocate the ccw request. */
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
datasize, startdev);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
data = cqr->data;
if (use_prefix) {
prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
startdev, 1, first_offs + 1, trkcount, 0, 0);
} else {
define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
ccw[-1].flags |= CCW_FLAG_CC;
data += sizeof(struct DE_eckd_data);
locate_record_ext(ccw++, data, first_trk, first_offs + 1,
trkcount, cmd, basedev, 0, 0);
}
idaws = (unsigned long *)(cqr->data + size);
len_to_track_end = 0;
if (start_padding_sectors) {
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = cmd;
/* maximum 3390 track size */
ccw->count = 57326;
/* 64k map to one track */
len_to_track_end = 65536 - start_padding_sectors * 512;
ccw->cda = (__u32)(addr_t)idaws;
ccw->flags |= CCW_FLAG_IDA;
ccw->flags |= CCW_FLAG_SLI;
ccw++;
for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
}
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
seg_len = bv.bv_len;
if (cmd == DASD_ECKD_CCW_READ_TRACK)
memset(dst, 0, seg_len);
if (!len_to_track_end) {
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = cmd;
/* maximum 3390 track size */
ccw->count = 57326;
/* 64k map to one track */
len_to_track_end = 65536;
ccw->cda = (__u32)(addr_t)idaws;
ccw->flags |= CCW_FLAG_IDA;
ccw->flags |= CCW_FLAG_SLI;
ccw++;
}
len_to_track_end -= seg_len;
idaws = idal_create_words(idaws, dst, seg_len);
}
for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ;
cqr->lpm = dasd_path_get_ppm(startdev);
cqr->retries = startdev->default_retries;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static int
dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
{
struct dasd_eckd_private *private;
struct ccw1 *ccw;
struct req_iterator iter;
struct bio_vec bv;
char *dst, *cda;
unsigned int blksize, blk_per_trk, off;
sector_t recid;
int status;
if (!dasd_page_cache)
goto out;
private = cqr->block->base->private;
blksize = cqr->block->bp_block;
blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
ccw = cqr->cpaddr;
/* Skip over define extent & locate record. */
ccw++;
if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
ccw++;
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
for (off = 0; off < bv.bv_len; off += blksize) {
/* Skip locate record. */
if (private->uses_cdl && recid <= 2*blk_per_trk)
ccw++;
if (dst) {
if (ccw->flags & CCW_FLAG_IDA)
cda = *((char **)((addr_t) ccw->cda));
else
cda = (char *)((addr_t) ccw->cda);
if (dst != cda) {
if (rq_data_dir(req) == READ)
memcpy(dst, cda, bv.bv_len);
kmem_cache_free(dasd_page_cache,
(void *)((addr_t)cda & PAGE_MASK));
}
dst = NULL;
}
ccw++;
recid++;
}
}
out:
status = cqr->status == DASD_CQR_DONE;
dasd_sfree_request(cqr, cqr->memdev);
return status;
}
/*
* Modify ccw/tcw in cqr so it can be started on a base device.
*
* Note that this is not enough to restart the cqr!
* Either reset cqr->startdev as well (summary unit check handling)
* or restart via separate cqr (as in ERP handling).
*/
void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
{
struct ccw1 *ccw;
struct PFX_eckd_data *pfxdata;
struct tcw *tcw;
struct tccb *tccb;
struct dcw *dcw;
if (cqr->cpmode == 1) {
tcw = cqr->cpaddr;
tccb = tcw_get_tccb(tcw);
dcw = (struct dcw *)&tccb->tca[0];
pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
pfxdata->validity.verify_base = 0;
pfxdata->validity.hyper_pav = 0;
} else {
ccw = cqr->cpaddr;
pfxdata = cqr->data;
if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
pfxdata->validity.verify_base = 0;
pfxdata->validity.hyper_pav = 0;
}
}
}
#define DASD_ECKD_CHANQ_MAX_SIZE 4
static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
struct dasd_block *block,
struct request *req)
{
struct dasd_eckd_private *private;
struct dasd_device *startdev;
unsigned long flags;
struct dasd_ccw_req *cqr;
startdev = dasd_alias_get_start_dev(base);
if (!startdev)
startdev = base;
private = startdev->private;
if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
return ERR_PTR(-EBUSY);
spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
private->count++;
if ((base->features & DASD_FEATURE_USERAW))
cqr = dasd_eckd_build_cp_raw(startdev, block, req);
else
cqr = dasd_eckd_build_cp(startdev, block, req);
if (IS_ERR(cqr))
private->count--;
spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
return cqr;
}
static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
struct request *req)
{
struct dasd_eckd_private *private;
unsigned long flags;
spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
private = cqr->memdev->private;
private->count--;
spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
return dasd_eckd_free_cp(cqr, req);
}
static int
dasd_eckd_fill_info(struct dasd_device * device,
struct dasd_information2_t * info)
{
struct dasd_eckd_private *private = device->private;
info->label_block = 2;
info->FBA_layout = private->uses_cdl ? 0 : 1;
info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
info->characteristics_size = sizeof(private->rdc_data);
memcpy(info->characteristics, &private->rdc_data,
sizeof(private->rdc_data));
info->confdata_size = min((unsigned long)private->conf_len,
sizeof(info->configuration_data));
memcpy(info->configuration_data, private->conf_data,
info->confdata_size);
return 0;
}
/*
* SECTION: ioctl functions for eckd devices.
*/
/*
* Release device ioctl.
* Buils a channel programm to releases a prior reserved
* (see dasd_eckd_reserve) device.
*/
static int
dasd_eckd_release(struct dasd_device *device)
{
struct dasd_ccw_req *cqr;
int rc;
struct ccw1 *ccw;
int useglobal;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
useglobal = 0;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
if (IS_ERR(cqr)) {
mutex_lock(&dasd_reserve_mutex);
useglobal = 1;
cqr = &dasd_reserve_req->cqr;
memset(cqr, 0, sizeof(*cqr));
memset(&dasd_reserve_req->ccw, 0,
sizeof(dasd_reserve_req->ccw));
cqr->cpaddr = &dasd_reserve_req->ccw;
cqr->data = &dasd_reserve_req->data;
cqr->magic = DASD_ECKD_MAGIC;
}
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = 32;
ccw->cda = (__u32)(addr_t) cqr->data;
cqr->startdev = device;
cqr->memdev = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 2; /* set retry counter to enable basic ERP */
cqr->expires = 2 * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
rc = dasd_sleep_on_immediatly(cqr);
if (!rc)
clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
if (useglobal)
mutex_unlock(&dasd_reserve_mutex);
else
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Reserve device ioctl.
* Options are set to 'synchronous wait for interrupt' and
* 'timeout the request'. This leads to a terminate IO if
* the interrupt is outstanding for a certain time.
*/
static int
dasd_eckd_reserve(struct dasd_device *device)
{
struct dasd_ccw_req *cqr;
int rc;
struct ccw1 *ccw;
int useglobal;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
useglobal = 0;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
if (IS_ERR(cqr)) {
mutex_lock(&dasd_reserve_mutex);
useglobal = 1;
cqr = &dasd_reserve_req->cqr;
memset(cqr, 0, sizeof(*cqr));
memset(&dasd_reserve_req->ccw, 0,
sizeof(dasd_reserve_req->ccw));
cqr->cpaddr = &dasd_reserve_req->ccw;
cqr->data = &dasd_reserve_req->data;
cqr->magic = DASD_ECKD_MAGIC;
}
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = 32;
ccw->cda = (__u32)(addr_t) cqr->data;
cqr->startdev = device;
cqr->memdev = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 2; /* set retry counter to enable basic ERP */
cqr->expires = 2 * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
rc = dasd_sleep_on_immediatly(cqr);
if (!rc)
set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
if (useglobal)
mutex_unlock(&dasd_reserve_mutex);
else
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Steal lock ioctl - unconditional reserve device.
* Buils a channel programm to break a device's reservation.
* (unconditional reserve)
*/
static int
dasd_eckd_steal_lock(struct dasd_device *device)
{
struct dasd_ccw_req *cqr;
int rc;
struct ccw1 *ccw;
int useglobal;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
useglobal = 0;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
if (IS_ERR(cqr)) {
mutex_lock(&dasd_reserve_mutex);
useglobal = 1;
cqr = &dasd_reserve_req->cqr;
memset(cqr, 0, sizeof(*cqr));
memset(&dasd_reserve_req->ccw, 0,
sizeof(dasd_reserve_req->ccw));
cqr->cpaddr = &dasd_reserve_req->ccw;
cqr->data = &dasd_reserve_req->data;
cqr->magic = DASD_ECKD_MAGIC;
}
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_SLCK;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = 32;
ccw->cda = (__u32)(addr_t) cqr->data;
cqr->startdev = device;
cqr->memdev = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->retries = 2; /* set retry counter to enable basic ERP */
cqr->expires = 2 * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
rc = dasd_sleep_on_immediatly(cqr);
if (!rc)
set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
if (useglobal)
mutex_unlock(&dasd_reserve_mutex);
else
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* SNID - Sense Path Group ID
* This ioctl may be used in situations where I/O is stalled due to
* a reserve, so if the normal dasd_smalloc_request fails, we use the
* preallocated dasd_reserve_req.
*/
static int dasd_eckd_snid(struct dasd_device *device,
void __user *argp)
{
struct dasd_ccw_req *cqr;
int rc;
struct ccw1 *ccw;
int useglobal;
struct dasd_snid_ioctl_data usrparm;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
return -EFAULT;
useglobal = 0;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
sizeof(struct dasd_snid_data), device);
if (IS_ERR(cqr)) {
mutex_lock(&dasd_reserve_mutex);
useglobal = 1;
cqr = &dasd_reserve_req->cqr;
memset(cqr, 0, sizeof(*cqr));
memset(&dasd_reserve_req->ccw, 0,
sizeof(dasd_reserve_req->ccw));
cqr->cpaddr = &dasd_reserve_req->ccw;
cqr->data = &dasd_reserve_req->data;
cqr->magic = DASD_ECKD_MAGIC;
}
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_SNID;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = 12;
ccw->cda = (__u32)(addr_t) cqr->data;
cqr->startdev = device;
cqr->memdev = device;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
cqr->retries = 5;
cqr->expires = 10 * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
cqr->lpm = usrparm.path_mask;
rc = dasd_sleep_on_immediatly(cqr);
/* verify that I/O processing didn't modify the path mask */
if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
rc = -EIO;
if (!rc) {
usrparm.data = *((struct dasd_snid_data *)cqr->data);
if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
rc = -EFAULT;
}
if (useglobal)
mutex_unlock(&dasd_reserve_mutex);
else
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Read performance statistics
*/
static int
dasd_eckd_performance(struct dasd_device *device, void __user *argp)
{
struct dasd_psf_prssd_data *prssdp;
struct dasd_rssd_perf_stats_t *stats;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
int rc;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
(sizeof(struct dasd_psf_prssd_data) +
sizeof(struct dasd_rssd_perf_stats_t)),
device);
if (IS_ERR(cqr)) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate initialization request");
return PTR_ERR(cqr);
}
cqr->startdev = device;
cqr->memdev = device;
cqr->retries = 0;
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
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 = 0x01; /* Performance Statistics */
prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
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 - Performance Statistics */
stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
ccw++;
ccw->cmd_code = DASD_ECKD_CCW_RSSD;
ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
ccw->cda = (__u32)(addr_t) stats;
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;
stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
if (copy_to_user(argp, stats,
sizeof(struct dasd_rssd_perf_stats_t)))
rc = -EFAULT;
}
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* Get attributes (cache operations)
* Returnes the cache attributes used in Define Extend (DE).
*/
static int
dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
{
struct dasd_eckd_private *private = device->private;
struct attrib_data_t attrib = private->attrib;
int rc;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!argp)
return -EINVAL;
rc = 0;
if (copy_to_user(argp, (long *) &attrib,
sizeof(struct attrib_data_t)))
rc = -EFAULT;
return rc;
}
/*
* Set attributes (cache operations)
* Stores the attributes for cache operation to be used in Define Extend (DE).
*/
static int
dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
{
struct dasd_eckd_private *private = device->private;
struct attrib_data_t attrib;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!argp)
return -EINVAL;
if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
return -EFAULT;
private->attrib = attrib;
dev_info(&device->cdev->dev,
"The DASD cache mode was set to %x (%i cylinder prestage)\n",
private->attrib.operation, private->attrib.nr_cyl);
return 0;
}
/*
* Issue syscall I/O to EMC Symmetrix array.
* CCWs are PSF and RSSD
*/
static int dasd_symm_io(struct dasd_device *device, void __user *argp)
{
struct dasd_symmio_parms usrparm;
char *psf_data, *rssd_result;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
char psf0, psf1;
int rc;
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
return -EACCES;
psf0 = psf1 = 0;
/* Copy parms from caller */
rc = -EFAULT;
if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
goto out;
if (is_compat_task()) {
/* Make sure pointers are sane even on 31 bit. */
rc = -EINVAL;
if ((usrparm.psf_data >> 32) != 0)
goto out;
if ((usrparm.rssd_result >> 32) != 0)
goto out;
usrparm.psf_data &= 0x7fffffffULL;
usrparm.rssd_result &= 0x7fffffffULL;
}
/* alloc I/O data area */
psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
if (!psf_data || !rssd_result) {
rc = -ENOMEM;
goto out_free;
}
/* get syscall header from user space */
rc = -EFAULT;
if (copy_from_user(psf_data,
(void __user *)(unsigned long) usrparm.psf_data,
usrparm.psf_data_len))
goto out_free;
psf0 = psf_data[0];
psf1 = psf_data[1];
/* setup CCWs for PSF + RSSD */
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
if (IS_ERR(cqr)) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate initialization request");
rc = PTR_ERR(cqr);
goto out_free;
}
cqr->startdev = device;
cqr->memdev = device;
cqr->retries = 3;
cqr->expires = 10 * HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
/* Build the ccws */
ccw = cqr->cpaddr;
/* PSF ccw */
ccw->cmd_code = DASD_ECKD_CCW_PSF;
ccw->count = usrparm.psf_data_len;
ccw->flags |= CCW_FLAG_CC;
ccw->cda = (__u32)(addr_t) psf_data;
ccw++;
/* RSSD ccw */
ccw->cmd_code = DASD_ECKD_CCW_RSSD;
ccw->count = usrparm.rssd_result_len;
ccw->flags = CCW_FLAG_SLI ;
ccw->cda = (__u32)(addr_t) rssd_result;
rc = dasd_sleep_on(cqr);
if (rc)
goto out_sfree;
rc = -EFAULT;
if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
rssd_result, usrparm.rssd_result_len))
goto out_sfree;
rc = 0;
out_sfree:
dasd_sfree_request(cqr, cqr->memdev);
out_free:
kfree(rssd_result);
kfree(psf_data);
out:
DBF_DEV_EVENT(DBF_WARNING, device,
"Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
(int) psf0, (int) psf1, rc);
return rc;
}
static int
dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
{
struct dasd_device *device = block->base;
switch (cmd) {
case BIODASDGATTR:
return dasd_eckd_get_attrib(device, argp);
case BIODASDSATTR:
return dasd_eckd_set_attrib(device, argp);
case BIODASDPSRD:
return dasd_eckd_performance(device, argp);
case BIODASDRLSE:
return dasd_eckd_release(device);
case BIODASDRSRV:
return dasd_eckd_reserve(device);
case BIODASDSLCK:
return dasd_eckd_steal_lock(device);
case BIODASDSNID:
return dasd_eckd_snid(device, argp);
case BIODASDSYMMIO:
return dasd_symm_io(device, argp);
default:
return -ENOTTY;
}
}
/*
* Dump the range of CCWs into 'page' buffer
* and return number of printed chars.
*/
static int
dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
{
int len, count;
char *datap;
len = 0;
while (from <= to) {
len += sprintf(page + len, PRINTK_HEADER
" CCW %p: %08X %08X DAT:",
from, ((int *) from)[0], ((int *) from)[1]);
/* get pointer to data (consider IDALs) */
if (from->flags & CCW_FLAG_IDA)
datap = (char *) *((addr_t *) (addr_t) from->cda);
else
datap = (char *) ((addr_t) from->cda);
/* dump data (max 32 bytes) */
for (count = 0; count < from->count && count < 32; count++) {
if (count % 8 == 0) len += sprintf(page + len, " ");
if (count % 4 == 0) len += sprintf(page + len, " ");
len += sprintf(page + len, "%02x", datap[count]);
}
len += sprintf(page + len, "\n");
from++;
}
return len;
}
static void
dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
char *reason)
{
u64 *sense;
u64 *stat;
sense = (u64 *) dasd_get_sense(irb);
stat = (u64 *) &irb->scsw;
if (sense) {
DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
"%016llx %016llx %016llx %016llx",
reason, *stat, *((u32 *) (stat + 1)),
sense[0], sense[1], sense[2], sense[3]);
} else {
DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
reason, *stat, *((u32 *) (stat + 1)),
"NO VALID SENSE");
}
}
/*
* Print sense data and related channel program.
* Parts are printed because printk buffer is only 1024 bytes.
*/
static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
struct dasd_ccw_req *req, struct irb *irb)
{
char *page;
struct ccw1 *first, *last, *fail, *from, *to;
int len, sl, sct;
page = (char *) get_zeroed_page(GFP_ATOMIC);
if (page == NULL) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"No memory to dump sense data\n");
return;
}
/* dump the sense data */
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 CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
"CS:%02X RC:%d\n",
req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
req ? req->intrc : 0);
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");
}
if (irb->ecw[27] & DASD_SENSE_BIT_0) {
/* 24 Byte Sense Data */
sprintf(page + len, PRINTK_HEADER
" 24 Byte: %x MSG %x, "
"%s MSGb to SYSOP\n",
irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
irb->ecw[1] & 0x10 ? "" : "no");
} else {
/* 32 Byte Sense Data */
sprintf(page + len, PRINTK_HEADER
" 32 Byte: Format: %x "
"Exception class %x\n",
irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
}
} else {
sprintf(page + len, PRINTK_HEADER
" SORRY - NO VALID SENSE AVAILABLE\n");
}
printk(KERN_ERR "%s", page);
if (req) {
/* req == NULL for unsolicited interrupts */
/* dump the Channel Program (max 140 Bytes per line) */
/* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
first = req->cpaddr;
for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
to = min(first + 6, last);
len = sprintf(page, PRINTK_HEADER
" Related CP in req: %p\n", req);
dasd_eckd_dump_ccw_range(first, to, page + len);
printk(KERN_ERR "%s", page);
/* print failing CCW area (maximum 4) */
/* scsw->cda is either valid or zero */
len = 0;
from = ++to;
fail = (struct ccw1 *)(addr_t)
irb->scsw.cmd.cpa; /* failing CCW */
if (from < fail - 2) {
from = fail - 2; /* there is a gap - print header */
len += sprintf(page, PRINTK_HEADER "......\n");
}
to = min(fail + 1, last);
len += dasd_eckd_dump_ccw_range(from, to, page + len);
/* print last CCWs (maximum 2) */
from = max(from, ++to);
if (from < last - 1) {
from = last - 1; /* there is a gap - print header */
len += sprintf(page + len, PRINTK_HEADER "......\n");
}
len += dasd_eckd_dump_ccw_range(from, last, page + len);
if (len > 0)
printk(KERN_ERR "%s", page);
}
free_page((unsigned long) page);
}
/*
* Print sense data from a tcw.
*/
static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
struct dasd_ccw_req *req, struct irb *irb)
{
char *page;
int len, sl, sct, residual;
struct tsb *tsb;
u8 *sense, *rcq;
page = (char *) get_zeroed_page(GFP_ATOMIC);
if (page == NULL) {
DBF_DEV_EVENT(DBF_WARNING, device, " %s",
"No memory to dump sense data");
return;
}
/* dump the sense data */
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 CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
"CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
irb->scsw.tm.fcxs,
(irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
req ? req->intrc : 0);
len += sprintf(page + len, PRINTK_HEADER
" device %s: Failing TCW: %p\n",
dev_name(&device->cdev->dev),
(void *) (addr_t) irb->scsw.tm.tcw);
tsb = NULL;
sense = NULL;
if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
tsb = tcw_get_tsb(
(struct tcw *)(unsigned long)irb->scsw.tm.tcw);
if (tsb) {
len += sprintf(page + len, PRINTK_HEADER
" tsb->length %d\n", tsb->length);
len += sprintf(page + len, PRINTK_HEADER
" tsb->flags %x\n", tsb->flags);
len += sprintf(page + len, PRINTK_HEADER
" tsb->dcw_offset %d\n", tsb->dcw_offset);
len += sprintf(page + len, PRINTK_HEADER
" tsb->count %d\n", tsb->count);
residual = tsb->count - 28;
len += sprintf(page + len, PRINTK_HEADER
" residual %d\n", residual);
switch (tsb->flags & 0x07) {
case 1: /* tsa_iostat */
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.iostat.dev_time %d\n",
tsb->tsa.iostat.dev_time);
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.iostat.def_time %d\n",
tsb->tsa.iostat.def_time);
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.iostat.queue_time %d\n",
tsb->tsa.iostat.queue_time);
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.iostat.dev_busy_time %d\n",
tsb->tsa.iostat.dev_busy_time);
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.iostat.dev_act_time %d\n",
tsb->tsa.iostat.dev_act_time);
sense = tsb->tsa.iostat.sense;
break;
case 2: /* ts_ddpc */
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
for (sl = 0; sl < 2; sl++) {
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.ddpc.rcq %2d-%2d: ",
(8 * sl), ((8 * sl) + 7));
rcq = tsb->tsa.ddpc.rcq;
for (sct = 0; sct < 8; sct++) {
len += sprintf(page + len, " %02x",
rcq[8 * sl + sct]);
}
len += sprintf(page + len, "\n");
}
sense = tsb->tsa.ddpc.sense;
break;
case 3: /* tsa_intrg */
len += sprintf(page + len, PRINTK_HEADER
" tsb->tsa.intrg.: not supported yet\n");
break;
}
if (sense) {
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",
sense[8 * sl + sct]);
}
len += sprintf(page + len, "\n");
}
if (sense[27] & DASD_SENSE_BIT_0) {
/* 24 Byte Sense Data */
sprintf(page + len, PRINTK_HEADER
" 24 Byte: %x MSG %x, "
"%s MSGb to SYSOP\n",
sense[7] >> 4, sense[7] & 0x0f,
sense[1] & 0x10 ? "" : "no");
} else {
/* 32 Byte Sense Data */
sprintf(page + len, PRINTK_HEADER
" 32 Byte: Format: %x "
"Exception class %x\n",
sense[6] & 0x0f, sense[22] >> 4);
}
} else {
sprintf(page + len, PRINTK_HEADER
" SORRY - NO VALID SENSE AVAILABLE\n");
}
} else {
sprintf(page + len, PRINTK_HEADER
" SORRY - NO TSB DATA AVAILABLE\n");
}
printk(KERN_ERR "%s", page);
free_page((unsigned long) page);
}
static void dasd_eckd_dump_sense(struct dasd_device *device,
struct dasd_ccw_req *req, struct irb *irb)
{
u8 *sense = dasd_get_sense(irb);
if (scsw_is_tm(&irb->scsw)) {
/*
* In some cases the 'File Protected' or 'Incorrect Length'
* error might be expected and log messages shouldn't be written
* then. Check if the according suppress bit is set.
*/
if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
return;
if (scsw_cstat(&irb->scsw) == 0x40 &&
test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
return;
dasd_eckd_dump_sense_tcw(device, req, irb);
} else {
/*
* In some cases the 'Command Reject' or 'No Record Found'
* error might be expected and log messages shouldn't be
* written then. Check if the according suppress bit is set.
*/
if (sense && sense[0] & SNS0_CMD_REJECT &&
test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
return;
if (sense && sense[1] & SNS1_NO_REC_FOUND &&
test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
return;
dasd_eckd_dump_sense_ccw(device, req, irb);
}
}
static int dasd_eckd_pm_freeze(struct dasd_device *device)
{
/*
* the device should be disconnected from our LCU structure
* on restore we will reconnect it and reread LCU specific
* information like PAV support that might have changed
*/
dasd_alias_remove_device(device);
dasd_alias_disconnect_device_from_lcu(device);
return 0;
}
static int dasd_eckd_restore_device(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
struct dasd_eckd_characteristics temp_rdc_data;
int rc;
struct dasd_uid temp_uid;
unsigned long flags;
unsigned long cqr_flags = 0;
/* Read Configuration Data */
rc = dasd_eckd_read_conf(device);
if (rc) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Read configuration data failed, rc=%d", rc);
goto out_err;
}
dasd_eckd_get_uid(device, &temp_uid);
/* Generate device unique id */
rc = dasd_eckd_generate_uid(device);
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
dev_err(&device->cdev->dev, "The UID of the DASD has "
"changed\n");
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
if (rc)
goto out_err;
/* register lcu with alias handling, enable PAV if this is a new lcu */
rc = dasd_alias_make_device_known_to_lcu(device);
if (rc)
goto out_err;
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
dasd_eckd_validate_server(device, cqr_flags);
/* RE-Read Configuration Data */
rc = dasd_eckd_read_conf(device);
if (rc) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Read configuration data failed, rc=%d", rc);
goto out_err2;
}
/* Read Feature Codes */
dasd_eckd_read_features(device);
/* Read Device Characteristics */
rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
&temp_rdc_data, 64);
if (rc) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Read device characteristic failed, rc=%d", rc);
goto out_err2;
}
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
/* add device to alias management */
dasd_alias_add_device(device);
return 0;
out_err2:
dasd_alias_disconnect_device_from_lcu(device);
out_err:
return -1;
}
static int dasd_eckd_reload_device(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
int rc, old_base;
char print_uid[60];
struct dasd_uid uid;
unsigned long flags;
/*
* remove device from alias handling to prevent new requests
* from being scheduled on the wrong alias device
*/
dasd_alias_remove_device(device);
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
old_base = private->uid.base_unit_addr;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
/* Read Configuration Data */
rc = dasd_eckd_read_conf(device);
if (rc)
goto out_err;
rc = dasd_eckd_generate_uid(device);
if (rc)
goto out_err;
/*
* update unit address configuration and
* add device to alias management
*/
dasd_alias_update_add_device(device);
dasd_eckd_get_uid(device, &uid);
if (old_base != uid.base_unit_addr) {
if (strlen(uid.vduit) > 0)
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
uid.ssid, uid.base_unit_addr, uid.vduit);
else
snprintf(print_uid, sizeof(print_uid),
"%s.%s.%04x.%02x", uid.vendor, uid.serial,
uid.ssid, uid.base_unit_addr);
dev_info(&device->cdev->dev,
"An Alias device was reassigned to a new base device "
"with UID: %s\n", print_uid);
}
return 0;
out_err:
return -1;
}
static int dasd_eckd_read_message_buffer(struct dasd_device *device,
struct dasd_rssd_messages *messages,
__u8 lpum)
{
struct dasd_rssd_messages *message_buf;
struct dasd_psf_prssd_data *prssdp;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
int rc;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
(sizeof(struct dasd_psf_prssd_data) +
sizeof(struct dasd_rssd_messages)),
device);
if (IS_ERR(cqr)) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"Could not allocate read message buffer request");
return PTR_ERR(cqr);
}
cqr->lpm = lpum;
retry:
cqr->startdev = device;
cqr->memdev = device;
cqr->block = NULL;
cqr->expires = 10 * HZ;
set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
/* dasd_sleep_on_immediatly does not do complex error
* recovery so clear erp flag and set retry counter to
* do basic erp */
clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
cqr->retries = 256;
/* 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 = 0x03; /* Message Buffer */
/* 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->flags |= CCW_FLAG_SLI;
ccw->cda = (__u32)(addr_t) prssdp;
/* Read Subsystem Data - message buffer */
message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
ccw++;
ccw->cmd_code = DASD_ECKD_CCW_RSSD;
ccw->count = sizeof(struct dasd_rssd_messages);
ccw->flags |= CCW_FLAG_SLI;
ccw->cda = (__u32)(addr_t) message_buf;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
rc = dasd_sleep_on_immediatly(cqr);
if (rc == 0) {
prssdp = (struct dasd_psf_prssd_data *) cqr->data;
message_buf = (struct dasd_rssd_messages *)
(prssdp + 1);
memcpy(messages, message_buf,
sizeof(struct dasd_rssd_messages));
} else if (cqr->lpm) {
/*
* on z/VM we might not be able to do I/O on the requested path
* but instead we get the required information on any path
* so retry with open path mask
*/
cqr->lpm = 0;
goto retry;
} else
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Reading messages failed with rc=%d\n"
, rc);
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
static int dasd_eckd_query_host_access(struct dasd_device *device,
struct dasd_psf_query_host_access *data)
{
struct dasd_eckd_private *private = device->private;
struct dasd_psf_query_host_access *host_access;
struct dasd_psf_prssd_data *prssdp;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
int rc;
/* not available for HYPER PAV alias devices */
if (!device->block && private->lcu->pav == HYPER_PAV)
return -EOPNOTSUPP;
/* may not be supported by the storage server */
if (!(private->features.feature[14] & 0x80))
return -EOPNOTSUPP;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
sizeof(struct dasd_psf_prssd_data) + 1,
device);
if (IS_ERR(cqr)) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"Could not allocate read message buffer request");
return PTR_ERR(cqr);
}
host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
if (!host_access) {
dasd_sfree_request(cqr, device);
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"Could not allocate host_access buffer");
return -ENOMEM;
}
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 = PSF_SUBORDER_QHA; /* query host access */
/* LSS and Volume that will be queried */
prssdp->lss = private->ned->ID;
prssdp->volume = private->ned->unit_addr;
/* 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->flags |= CCW_FLAG_SLI;
ccw->cda = (__u32)(addr_t) prssdp;
/* Read Subsystem Data - query host access */
ccw++;
ccw->cmd_code = DASD_ECKD_CCW_RSSD;
ccw->count = sizeof(struct dasd_psf_query_host_access);
ccw->flags |= CCW_FLAG_SLI;
ccw->cda = (__u32)(addr_t) host_access;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
/* the command might not be supported, suppress error message */
__set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
rc = dasd_sleep_on_interruptible(cqr);
if (rc == 0) {
*data = *host_access;
} else {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
"Reading host access data failed with rc=%d\n",
rc);
rc = -EOPNOTSUPP;
}
dasd_sfree_request(cqr, cqr->memdev);
kfree(host_access);
return rc;
}
/*
* return number of grouped devices
*/
static int dasd_eckd_host_access_count(struct dasd_device *device)
{
struct dasd_psf_query_host_access *access;
struct dasd_ckd_path_group_entry *entry;
struct dasd_ckd_host_information *info;
int count = 0;
int rc, i;
access = kzalloc(sizeof(*access), GFP_NOIO);
if (!access) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"Could not allocate access buffer");
return -ENOMEM;
}
rc = dasd_eckd_query_host_access(device, access);
if (rc) {
kfree(access);
return rc;
}
info = (struct dasd_ckd_host_information *)
access->host_access_information;
for (i = 0; i < info->entry_count; i++) {
entry = (struct dasd_ckd_path_group_entry *)
(info->entry + i * info->entry_size);
if (entry->status_flags & DASD_ECKD_PG_GROUPED)
count++;
}
kfree(access);
return count;
}
/*
* write host access information to a sequential file
*/
static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
{
struct dasd_psf_query_host_access *access;
struct dasd_ckd_path_group_entry *entry;
struct dasd_ckd_host_information *info;
char sysplex[9] = "";
int rc, i, j;
access = kzalloc(sizeof(*access), GFP_NOIO);
if (!access) {
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"Could not allocate access buffer");
return -ENOMEM;
}
rc = dasd_eckd_query_host_access(device, access);
if (rc) {
kfree(access);
return rc;
}
info = (struct dasd_ckd_host_information *)
access->host_access_information;
for (i = 0; i < info->entry_count; i++) {
entry = (struct dasd_ckd_path_group_entry *)
(info->entry + i * info->entry_size);
/* PGID */
seq_puts(m, "pgid ");
for (j = 0; j < 11; j++)
seq_printf(m, "%02x", entry->pgid[j]);
seq_putc(m, '\n');
/* FLAGS */
seq_printf(m, "status_flags %02x\n", entry->status_flags);
/* SYSPLEX NAME */
memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
EBCASC(sysplex, sizeof(sysplex));
seq_printf(m, "sysplex_name %8s\n", sysplex);
/* SUPPORTED CYLINDER */
seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
/* TIMESTAMP */
seq_printf(m, "timestamp %lu\n", (unsigned long)
entry->timestamp);
}
kfree(access);
return 0;
}
/*
* Perform Subsystem Function - CUIR response
*/
static int
dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
__u32 message_id, __u8 lpum)
{
struct dasd_psf_cuir_response *psf_cuir;
int pos = pathmask_to_pos(lpum);
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
int rc;
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
sizeof(struct dasd_psf_cuir_response),
device);
if (IS_ERR(cqr)) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate PSF-CUIR request");
return PTR_ERR(cqr);
}
psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
psf_cuir->cc = response;
psf_cuir->chpid = device->path[pos].chpid;
psf_cuir->message_id = message_id;
psf_cuir->cssid = device->path[pos].cssid;
psf_cuir->ssid = device->path[pos].ssid;
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_PSF;
ccw->cda = (__u32)(addr_t)psf_cuir;
ccw->flags = CCW_FLAG_SLI;
ccw->count = sizeof(struct dasd_psf_cuir_response);
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;
set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
rc = dasd_sleep_on(cqr);
dasd_sfree_request(cqr, cqr->memdev);
return rc;
}
/*
* return configuration data that is referenced by record selector
* if a record selector is specified or per default return the
* conf_data pointer for the path specified by lpum
*/
static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
__u8 lpum,
struct dasd_cuir_message *cuir)
{
struct dasd_conf_data *conf_data;
int path, pos;
if (cuir->record_selector == 0)
goto out;
for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
conf_data = device->path[pos].conf_data;
if (conf_data->gneq.record_selector ==
cuir->record_selector)
return conf_data;
}
out:
return device->path[pathmask_to_pos(lpum)].conf_data;
}
/*
* This function determines the scope of a reconfiguration request by
* analysing the path and device selection data provided in the CUIR request.
* Returns a path mask containing CUIR affected paths for the give device.
*
* If the CUIR request does not contain the required information return the
* path mask of the path the attention message for the CUIR request was reveived
* on.
*/
static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
struct dasd_cuir_message *cuir)
{
struct dasd_conf_data *ref_conf_data;
unsigned long bitmask = 0, mask = 0;
struct dasd_conf_data *conf_data;
unsigned int pos, path;
char *ref_gneq, *gneq;
char *ref_ned, *ned;
int tbcpm = 0;
/* if CUIR request does not specify the scope use the path
the attention message was presented on */
if (!cuir->ned_map ||
!(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
return lpum;
/* get reference conf data */
ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
/* reference ned is determined by ned_map field */
pos = 8 - ffs(cuir->ned_map);
ref_ned = (char *)&ref_conf_data->neds[pos];
ref_gneq = (char *)&ref_conf_data->gneq;
/* transfer 24 bit neq_map to mask */
mask = cuir->neq_map[2];
mask |= cuir->neq_map[1] << 8;
mask |= cuir->neq_map[0] << 16;
for (path = 0; path < 8; path++) {
/* initialise data per path */
bitmask = mask;
conf_data = device->path[path].conf_data;
pos = 8 - ffs(cuir->ned_map);
ned = (char *) &conf_data->neds[pos];
/* compare reference ned and per path ned */
if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
continue;
gneq = (char *)&conf_data->gneq;
/* compare reference gneq and per_path gneq under
24 bit mask where mask bit 0 equals byte 7 of
the gneq and mask bit 24 equals byte 31 */
while (bitmask) {
pos = ffs(bitmask) - 1;
if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
!= 0)
break;
clear_bit(pos, &bitmask);
}
if (bitmask)
continue;
/* device and path match the reference values
add path to CUIR scope */
tbcpm |= 0x80 >> path;
}
return tbcpm;
}
static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
unsigned long paths, int action)
{
int pos;
while (paths) {
/* get position of bit in mask */
pos = 8 - ffs(paths);
/* get channel path descriptor from this position */
if (action == CUIR_QUIESCE)
pr_warn("Service on the storage server caused path %x.%02x to go offline",
device->path[pos].cssid,
device->path[pos].chpid);
else if (action == CUIR_RESUME)
pr_info("Path %x.%02x is back online after service on the storage server",
device->path[pos].cssid,
device->path[pos].chpid);
clear_bit(7 - pos, &paths);
}
}
static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
struct dasd_cuir_message *cuir)
{
unsigned long tbcpm;
tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
/* nothing to do if path is not in use */
if (!(dasd_path_get_opm(device) & tbcpm))
return 0;
if (!(dasd_path_get_opm(device) & ~tbcpm)) {
/* no path would be left if the CUIR action is taken
return error */
return -EINVAL;
}
/* remove device from operational path mask */
dasd_path_remove_opm(device, tbcpm);
dasd_path_add_cuirpm(device, tbcpm);
return tbcpm;
}
/*
* walk through all devices and build a path mask to quiesce them
* return an error if the last path to a device would be removed
*
* if only part of the devices are quiesced and an error
* occurs no onlining necessary, the storage server will
* notify the already set offline devices again
*/
static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
struct dasd_cuir_message *cuir)
{
struct dasd_eckd_private *private = device->private;
struct alias_pav_group *pavgroup, *tempgroup;
struct dasd_device *dev, *n;
unsigned long paths = 0;
unsigned long flags;
int tbcpm;
/* active devices */
list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
alias_list) {
spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
if (tbcpm < 0)
goto out_err;
paths |= tbcpm;
}
/* inactive devices */
list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
alias_list) {
spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
if (tbcpm < 0)
goto out_err;
paths |= tbcpm;
}
/* devices in PAV groups */
list_for_each_entry_safe(pavgroup, tempgroup,
&private->lcu->grouplist, group) {
list_for_each_entry_safe(dev, n, &pavgroup->baselist,
alias_list) {
spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
spin_unlock_irqrestore(
get_ccwdev_lock(dev->cdev), flags);
if (tbcpm < 0)
goto out_err;
paths |= tbcpm;
}
list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
alias_list) {
spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
spin_unlock_irqrestore(
get_ccwdev_lock(dev->cdev), flags);
if (tbcpm < 0)
goto out_err;
paths |= tbcpm;
}
}
/* notify user about all paths affected by CUIR action */
dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
return 0;
out_err:
return tbcpm;
}
static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
struct dasd_cuir_message *cuir)
{
struct dasd_eckd_private *private = device->private;
struct alias_pav_group *pavgroup, *tempgroup;
struct dasd_device *dev, *n;
unsigned long paths = 0;
int tbcpm;
/*
* the path may have been added through a generic path event before
* only trigger path verification if the path is not already in use
*/
list_for_each_entry_safe(dev, n,
&private->lcu->active_devices,
alias_list) {
tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
paths |= tbcpm;
if (!(dasd_path_get_opm(dev) & tbcpm)) {
dasd_path_add_tbvpm(dev, tbcpm);
dasd_schedule_device_bh(dev);
}
}
list_for_each_entry_safe(dev, n,
&private->lcu->inactive_devices,
alias_list) {
tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
paths |= tbcpm;
if (!(dasd_path_get_opm(dev) & tbcpm)) {
dasd_path_add_tbvpm(dev, tbcpm);
dasd_schedule_device_bh(dev);
}
}
/* devices in PAV groups */
list_for_each_entry_safe(pavgroup, tempgroup,
&private->lcu->grouplist,
group) {
list_for_each_entry_safe(dev, n,
&pavgroup->baselist,
alias_list) {
tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
paths |= tbcpm;
if (!(dasd_path_get_opm(dev) & tbcpm)) {
dasd_path_add_tbvpm(dev, tbcpm);
dasd_schedule_device_bh(dev);
}
}
list_for_each_entry_safe(dev, n,
&pavgroup->aliaslist,
alias_list) {
tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
paths |= tbcpm;
if (!(dasd_path_get_opm(dev) & tbcpm)) {
dasd_path_add_tbvpm(dev, tbcpm);
dasd_schedule_device_bh(dev);
}
}
}
/* notify user about all paths affected by CUIR action */
dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
return 0;
}
static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
__u8 lpum)
{
struct dasd_cuir_message *cuir = messages;
int response;
DBF_DEV_EVENT(DBF_WARNING, device,
"CUIR request: %016llx %016llx %016llx %08x",
((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
((u32 *)cuir)[3]);
if (cuir->code == CUIR_QUIESCE) {
/* quiesce */
if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
response = PSF_CUIR_LAST_PATH;
else
response = PSF_CUIR_COMPLETED;
} else if (cuir->code == CUIR_RESUME) {
/* resume */
dasd_eckd_cuir_resume(device, lpum, cuir);
response = PSF_CUIR_COMPLETED;
} else
response = PSF_CUIR_NOT_SUPPORTED;
dasd_eckd_psf_cuir_response(device, response,
cuir->message_id, lpum);
DBF_DEV_EVENT(DBF_WARNING, device,
"CUIR response: %d on message ID %08x", response,
cuir->message_id);
/* to make sure there is no attention left schedule work again */
device->discipline->check_attention(device, lpum);
}
static void dasd_eckd_check_attention_work(struct work_struct *work)
{
struct check_attention_work_data *data;
struct dasd_rssd_messages *messages;
struct dasd_device *device;
int rc;
data = container_of(work, struct check_attention_work_data, worker);
device = data->device;
messages = kzalloc(sizeof(*messages), GFP_KERNEL);
if (!messages) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate attention message buffer");
goto out;
}
rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
if (rc)
goto out;
if (messages->length == ATTENTION_LENGTH_CUIR &&
messages->format == ATTENTION_FORMAT_CUIR)
dasd_eckd_handle_cuir(device, messages, data->lpum);
out:
dasd_put_device(device);
kfree(messages);
kfree(data);
}
static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
{
struct check_attention_work_data *data;
data = kzalloc(sizeof(*data), GFP_ATOMIC);
if (!data)
return -ENOMEM;
INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
dasd_get_device(device);
data->device = device;
data->lpum = lpum;
schedule_work(&data->worker);
return 0;
}
static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
{
if (~lpum & dasd_path_get_opm(device)) {
dasd_path_add_nohpfpm(device, lpum);
dasd_path_remove_opm(device, lpum);
dev_err(&device->cdev->dev,
"Channel path %02X lost HPF functionality and is disabled\n",
lpum);
return 1;
}
return 0;
}
static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
dev_err(&device->cdev->dev,
"High Performance FICON disabled\n");
private->fcx_max_data = 0;
}
static int dasd_eckd_hpf_enabled(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
return private->fcx_max_data ? 1 : 0;
}
static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
struct irb *irb)
{
struct dasd_eckd_private *private = device->private;
if (!private->fcx_max_data) {
/* sanity check for no HPF, the error makes no sense */
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Trying to disable HPF for a non HPF device");
return;
}
if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
dasd_eckd_disable_hpf_device(device);
} else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
return;
dasd_eckd_disable_hpf_device(device);
dasd_path_set_tbvpm(device,
dasd_path_get_hpfpm(device));
}
/*
* prevent that any new I/O ist started on the device and schedule a
* requeue of existing requests
*/
dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
dasd_schedule_requeue(device);
}
static struct ccw_driver dasd_eckd_driver = {
.driver = {
.name = "dasd-eckd",
.owner = THIS_MODULE,
},
.ids = dasd_eckd_ids,
.probe = dasd_eckd_probe,
.remove = dasd_generic_remove,
.set_offline = dasd_generic_set_offline,
.set_online = dasd_eckd_set_online,
.notify = dasd_generic_notify,
.path_event = dasd_generic_path_event,
.shutdown = dasd_generic_shutdown,
.freeze = dasd_generic_pm_freeze,
.thaw = dasd_generic_restore_device,
.restore = dasd_generic_restore_device,
.uc_handler = dasd_generic_uc_handler,
.int_class = IRQIO_DAS,
};
/*
* 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 one
* locate record ccw + 16 bytes of data. That makes:
* (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 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 249.5 blocks
* for one request. Give a little safety and the result is 240.
*/
static struct dasd_discipline dasd_eckd_discipline = {
.owner = THIS_MODULE,
.name = "ECKD",
.ebcname = "ECKD",
.max_blocks = 190,
.check_device = dasd_eckd_check_characteristics,
.uncheck_device = dasd_eckd_uncheck_device,
.do_analysis = dasd_eckd_do_analysis,
.verify_path = dasd_eckd_verify_path,
.basic_to_ready = dasd_eckd_basic_to_ready,
.online_to_ready = dasd_eckd_online_to_ready,
.basic_to_known = dasd_eckd_basic_to_known,
.fill_geometry = dasd_eckd_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
.handle_terminated_request = dasd_eckd_handle_terminated_request,
.format_device = dasd_eckd_format_device,
.check_device_format = dasd_eckd_check_device_format,
.erp_action = dasd_eckd_erp_action,
.erp_postaction = dasd_eckd_erp_postaction,
.check_for_device_change = dasd_eckd_check_for_device_change,
.build_cp = dasd_eckd_build_alias_cp,
.free_cp = dasd_eckd_free_alias_cp,
.dump_sense = dasd_eckd_dump_sense,
.dump_sense_dbf = dasd_eckd_dump_sense_dbf,
.fill_info = dasd_eckd_fill_info,
.ioctl = dasd_eckd_ioctl,
.freeze = dasd_eckd_pm_freeze,
.restore = dasd_eckd_restore_device,
.reload = dasd_eckd_reload_device,
.get_uid = dasd_eckd_get_uid,
.kick_validate = dasd_eckd_kick_validate_server,
.check_attention = dasd_eckd_check_attention,
.host_access_count = dasd_eckd_host_access_count,
.hosts_print = dasd_hosts_print,
.handle_hpf_error = dasd_eckd_handle_hpf_error,
.disable_hpf = dasd_eckd_disable_hpf_device,
.hpf_enabled = dasd_eckd_hpf_enabled,
.reset_path = dasd_eckd_reset_path,
};
static int __init
dasd_eckd_init(void)
{
int ret;
ASCEBC(dasd_eckd_discipline.ebcname, 4);
dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
GFP_KERNEL | GFP_DMA);
if (!dasd_reserve_req)
return -ENOMEM;
path_verification_worker = kmalloc(sizeof(*path_verification_worker),
GFP_KERNEL | GFP_DMA);
if (!path_verification_worker) {
kfree(dasd_reserve_req);
return -ENOMEM;
}
rawpadpage = (void *)__get_free_page(GFP_KERNEL);
if (!rawpadpage) {
kfree(path_verification_worker);
kfree(dasd_reserve_req);
return -ENOMEM;
}
ret = ccw_driver_register(&dasd_eckd_driver);
if (!ret)
wait_for_device_probe();
else {
kfree(path_verification_worker);
kfree(dasd_reserve_req);
free_page((unsigned long)rawpadpage);
}
return ret;
}
static void __exit
dasd_eckd_cleanup(void)
{
ccw_driver_unregister(&dasd_eckd_driver);
kfree(path_verification_worker);
kfree(dasd_reserve_req);
free_page((unsigned long)rawpadpage);
}
module_init(dasd_eckd_init);
module_exit(dasd_eckd_cleanup);
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