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[S390] add PAV support to the dasd driver.

Browse source 
Add support for parallel-access-volumes to the dasd driver. This
allows concurrent access to dasd devices with multiple channel
programs.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Horst Hummel 2006-06-29 15:08:18 +02:00 committed by Martin Schwidefsky
parent 8f27766a88
commit 405455734e
7 changed files with 227 additions and 90 deletions
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51
drivers/s390/block/dasd.c
View file

@ -1855,15 +1855,34 @@ dasd_generic_probe (struct ccw_device *cdev,
{
int ret;
ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
if (ret) {
printk(KERN_WARNING
"dasd_generic_probe: could not set ccw-device options "
"for %s\n", cdev->dev.bus_id);
return ret;
}
ret = dasd_add_sysfs_files(cdev);
if (ret) {
printk(KERN_WARNING
"dasd_generic_probe: could not add sysfs entries "
"for %s\n", cdev->dev.bus_id);
} else {
cdev->handler = &dasd_int_handler;
return ret;
}
cdev->handler = &dasd_int_handler;
/*
* Automatically online either all dasd devices (dasd_autodetect)
* or all devices specified with dasd= parameters during
* initial probe.
*/
if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
(dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0))
ret = ccw_device_set_online(cdev);
if (ret)
printk(KERN_WARNING
"dasd_generic_probe: could not initially online "
"ccw-device %s\n", cdev->dev.bus_id);
return ret;
}
@ -1911,6 +1930,8 @@ dasd_generic_set_online (struct ccw_device *cdev,
struct dasd_device *device;
int rc;
/* first online clears initial online feature flag */
dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
device = dasd_create_device(cdev);
if (IS_ERR(device))
return PTR_ERR(device);
@ -2065,31 +2086,6 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
return ret;
}
/*
* Automatically online either all dasd devices (dasd_autodetect) or
* all devices specified with dasd= parameters.
*/
static int
__dasd_auto_online(struct device *dev, void *data)
{
struct ccw_device *cdev;
cdev = to_ccwdev(dev);
if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0)
ccw_device_set_online(cdev);
return 0;
}
void
dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver)
{
struct device_driver *drv;
drv = get_driver(&dasd_discipline_driver->driver);
driver_for_each_device(drv, NULL, NULL, __dasd_auto_online);
put_driver(drv);
}
static int __init
dasd_init(void)
@ -2170,5 +2166,4 @@ EXPORT_SYMBOL_GPL(dasd_generic_remove);
EXPORT_SYMBOL_GPL(dasd_generic_notify);
EXPORT_SYMBOL_GPL(dasd_generic_set_online);
EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
EXPORT_SYMBOL_GPL(dasd_generic_auto_online);

80
drivers/s390/block/dasd_devmap.c
View file

@ -27,7 +27,7 @@
#include "dasd_int.h"
kmem_cache_t *dasd_page_cache;
EXPORT_SYMBOL(dasd_page_cache);
EXPORT_SYMBOL_GPL(dasd_page_cache);
/*
* dasd_devmap_t is used to store the features and the relation
@ -48,6 +48,20 @@ struct dasd_devmap {
struct dasd_uid uid;
};
/*
* dasd_servermap is used to store the server_id of all storage servers
* accessed by DASD device driver.
*/
struct dasd_servermap {
struct list_head list;
struct server_id {
char vendor[4];
char serial[15];
} sid;
};
static struct list_head dasd_serverlist;
/*
* Parameter parsing functions for dasd= parameter. The syntax is:
* <devno> : (0x)?[0-9a-fA-F]+
@ -64,6 +78,8 @@ struct dasd_devmap {
int dasd_probeonly = 0; /* is true, when probeonly mode is active */
int dasd_autodetect = 0; /* is true, when autodetection is active */
int dasd_nopav = 0; /* is true, when PAV is disabled */
EXPORT_SYMBOL_GPL(dasd_nopav);
/*
* char *dasd[] is intended to hold the ranges supplied by the dasd= statement
@ -228,19 +244,24 @@ dasd_parse_keyword( char *parsestring ) {
length = strlen(parsestring);
residual_str = parsestring + length;
}
if (strncmp ("autodetect", parsestring, length) == 0) {
if (strncmp("autodetect", parsestring, length) == 0) {
dasd_autodetect = 1;
MESSAGE (KERN_INFO, "%s",
"turning to autodetection mode");
return residual_str;
}
if (strncmp ("probeonly", parsestring, length) == 0) {
if (strncmp("probeonly", parsestring, length) == 0) {
dasd_probeonly = 1;
MESSAGE(KERN_INFO, "%s",
"turning to probeonly mode");
return residual_str;
}
if (strncmp ("fixedbuffers", parsestring, length) == 0) {
if (strncmp("nopav", parsestring, length) == 0) {
dasd_nopav = 1;
MESSAGE(KERN_INFO, "%s", "disable PAV mode");
return residual_str;
}
if (strncmp("fixedbuffers", parsestring, length) == 0) {
if (dasd_page_cache)
return residual_str;
dasd_page_cache =
@ -294,6 +315,8 @@ dasd_parse_range( char *parsestring ) {
features = dasd_feature_list(str, &str);
if (features < 0)
return ERR_PTR(-EINVAL);
/* each device in dasd= parameter should be set initially online */
features |= DASD_FEATURE_INITIAL_ONLINE;
while (from <= to) {
sprintf(bus_id, "%01x.%01x.%04x",
from_id0, from_id1, from++);
@ -836,6 +859,38 @@ static struct attribute_group dasd_attr_group = {
.attrs = dasd_attrs,
};
/*
* Check if the related storage server is already contained in the
* dasd_serverlist. If server is not contained, create new entry.
* Return 0 if server was already in serverlist,
* 1 if the server was added successfully
* <0 in case of error.
*/
static int
dasd_add_server(struct dasd_uid *uid)
{
struct dasd_servermap *new, *tmp;
/* check if server is already contained */
list_for_each_entry(tmp, &dasd_serverlist, list)
// normale cmp?
if (strncmp(tmp->sid.vendor, uid->vendor,
sizeof(tmp->sid.vendor)) == 0
&& strncmp(tmp->sid.serial, uid->serial,
sizeof(tmp->sid.serial)) == 0)
return 0;
new = (struct dasd_servermap *)
kzalloc(sizeof(struct dasd_servermap), GFP_KERNEL);
if (!new)
return -ENOMEM;
strncpy(new->sid.vendor, uid->vendor, sizeof(new->sid.vendor));
strncpy(new->sid.serial, uid->serial, sizeof(new->sid.serial));
list_add(&new->list, &dasd_serverlist);
return 1;
}
/*
* Return copy of the device unique identifier.
@ -856,21 +911,26 @@ dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid)
/*
* Register the given device unique identifier into devmap struct.
* Return 0 if server was already in serverlist,
* 1 if the server was added successful
* <0 in case of error.
*/
int
dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid)
{
struct dasd_devmap *devmap;
int rc;
devmap = dasd_find_busid(cdev->dev.bus_id);
if (IS_ERR(devmap))
return PTR_ERR(devmap);
spin_lock(&dasd_devmap_lock);
devmap->uid = *uid;
rc = dasd_add_server(uid);
spin_unlock(&dasd_devmap_lock);
return 0;
return rc;
}
EXPORT_SYMBOL(dasd_set_uid);
EXPORT_SYMBOL_GPL(dasd_set_uid);
/*
* Return value of the specified feature.
@ -882,7 +942,7 @@ dasd_get_feature(struct ccw_device *cdev, int feature)
devmap = dasd_find_busid(cdev->dev.bus_id);
if (IS_ERR(devmap))
return (int) PTR_ERR(devmap);
return PTR_ERR(devmap);
return ((devmap->features & feature) != 0);
}
@ -898,7 +958,7 @@ dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
devmap = dasd_find_busid(cdev->dev.bus_id);
if (IS_ERR(devmap))
return (int) PTR_ERR(devmap);
return PTR_ERR(devmap);
spin_lock(&dasd_devmap_lock);
if (flag)
@ -934,8 +994,10 @@ dasd_devmap_init(void)
dasd_max_devindex = 0;
for (i = 0; i < 256; i++)
INIT_LIST_HEAD(&dasd_hashlists[i]);
return 0;
/* Initialize servermap structure. */
INIT_LIST_HEAD(&dasd_serverlist);
return 0;
}
void

140
drivers/s390/block/dasd_eckd.c
View file

@ -24,6 +24,7 @@
#include <asm/io.h>
#include <asm/todclk.h>
#include <asm/uaccess.h>
#include <asm/cio.h>
#include <asm/ccwdev.h>
#include "dasd_int.h"
@ -89,17 +90,22 @@ dasd_eckd_probe (struct ccw_device *cdev)
{
int ret;
ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
if (ret)
/* set ECKD specific ccw-device options */
ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
if (ret) {
printk(KERN_WARNING
"dasd_eckd_probe: could not set ccw-device options "
"for %s\n", cdev->dev.bus_id);
return ret;
ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
return 0;
}
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);
return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
}
static struct ccw_driver dasd_eckd_driver = {
@ -540,6 +546,86 @@ dasd_eckd_read_conf(struct dasd_device *device)
return 0;
}
/*
* Build CP for Perform Subsystem Function - SSC.
*/
struct dasd_ccw_req *
dasd_eckd_build_psf_ssc(struct dasd_device *device)
{
struct dasd_ccw_req *cqr;
struct dasd_psf_ssc_data *psf_ssc_data;
struct ccw1 *ccw;
cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
sizeof(struct dasd_psf_ssc_data),
device);
if (IS_ERR(cqr)) {
DEV_MESSAGE(KERN_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 = 0x08;
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_PSF;
ccw->cda = (__u32)(addr_t)psf_ssc_data;
ccw->count = 66;
cqr->device = device;
cqr->expires = 10*HZ;
cqr->buildclk = get_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)
{
struct dasd_ccw_req *cqr;
int rc;
cqr = dasd_eckd_build_psf_ssc(device);
if (IS_ERR(cqr))
return PTR_ERR(cqr);
rc = dasd_sleep_on(cqr);
if (!rc)
/* trigger CIO to reprobe devices */
css_schedule_reprobe();
dasd_sfree_request(cqr, cqr->device);
return rc;
}
/*
* Valide storage server of current device.
*/
static int
dasd_eckd_validate_server(struct dasd_device *device)
{
int rc;
/* Currently PAV is the only reason to 'validate' server on LPAR */
if (dasd_nopav || MACHINE_IS_VM)
return 0;
rc = dasd_eckd_psf_ssc(device);
if (rc)
/* may be requested feature is not available on server,
* therefore just report error and go ahead */
DEV_MESSAGE(KERN_INFO, device,
"Perform Subsystem Function returned rc=%d", rc);
/* RE-Read Configuration Data */
return dasd_eckd_read_conf(device);
}
/*
* Check device characteristics.
* If the device is accessible using ECKD discipline, the device is enabled.
@ -570,16 +656,29 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
private->attrib.operation = DASD_NORMAL_CACHE;
private->attrib.nr_cyl = 0;
/* Read Configuration Data */
rc = dasd_eckd_read_conf(device);
if (rc)
return rc;
/* Generate device unique id and register in devmap */
rc = dasd_eckd_generate_uid(device, &uid);
if (rc)
return rc;
rc = dasd_set_uid(device->cdev, &uid);
if (rc == 1) /* new server found */
rc = dasd_eckd_validate_server(device);
if (rc)
return rc;
/* Read Device Characteristics */
rdc_data = (void *) &(private->rdc_data);
memset(rdc_data, 0, sizeof(rdc_data));
rc = read_dev_chars(device->cdev, &rdc_data, 64);
if (rc) {
if (rc)
DEV_MESSAGE(KERN_WARNING, device,
"Read device characteristics returned error %d",
rc);
return rc;
}
"Read device characteristics returned "
"rc=%d", rc);
DEV_MESSAGE(KERN_INFO, device,
"%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
@ -590,19 +689,6 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
private->rdc_data.no_cyl,
private->rdc_data.trk_per_cyl,
private->rdc_data.sec_per_trk);
/* Read Configuration Data */
rc = dasd_eckd_read_conf (device);
if (rc)
return rc;
/* Generate device unique id and register in devmap */
rc = dasd_eckd_generate_uid(device, &uid);
if (rc)
return rc;
rc = dasd_set_uid(device->cdev, &uid);
return rc;
}
@ -1687,14 +1773,8 @@ static struct dasd_discipline dasd_eckd_discipline = {
static int __init
dasd_eckd_init(void)
{
int ret;
ASCEBC(dasd_eckd_discipline.ebcname, 4);
ret = ccw_driver_register(&dasd_eckd_driver);
if (!ret)
dasd_generic_auto_online(&dasd_eckd_driver);
return ret;
return ccw_driver_register(&dasd_eckd_driver);
}
static void __exit

16
drivers/s390/block/dasd_eckd.h
View file

@ -41,9 +41,10 @@
#define DASD_ECKD_CCW_RESERVE 0xB4
/*
*Perform Subsystem Function / Sub-Orders
* Perform Subsystem Function / Sub-Orders
*/
#define PSF_ORDER_PRSSD 0x18
#define PSF_ORDER_PRSSD 0x18
#define PSF_ORDER_SSC 0x1D
/*****************************************************************************
* SECTION: Type Definitions
@ -353,4 +354,15 @@ struct dasd_psf_prssd_data {
unsigned char varies[9];
} __attribute__ ((packed));
/*
* Perform Subsystem Function - Set Subsystem Characteristics
*/
struct dasd_psf_ssc_data {
unsigned char order;
unsigned char flags;
unsigned char cu_type[4];
unsigned char suborder;
unsigned char reserved[59];
} __attribute__((packed));
#endif /* DASD_ECKD_H */

20
drivers/s390/block/dasd_fba.c
View file

@ -56,19 +56,13 @@ static struct ccw_driver dasd_fba_driver; /* see below */
static int
dasd_fba_probe(struct ccw_device *cdev)
{
int ret;
ret = dasd_generic_probe (cdev, &dasd_fba_discipline);
if (ret)
return ret;
ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
return 0;
return dasd_generic_probe(cdev, &dasd_fba_discipline);
}
static int
dasd_fba_set_online(struct ccw_device *cdev)
{
return dasd_generic_set_online (cdev, &dasd_fba_discipline);
return dasd_generic_set_online(cdev, &dasd_fba_discipline);
}
static struct ccw_driver dasd_fba_driver = {
@ -569,16 +563,8 @@ static struct dasd_discipline dasd_fba_discipline = {
static int __init
dasd_fba_init(void)
{
int ret;
ASCEBC(dasd_fba_discipline.ebcname, 4);
ret = ccw_driver_register(&dasd_fba_driver);
if (ret)
return ret;
dasd_generic_auto_online(&dasd_fba_driver);
return 0;
return ccw_driver_register(&dasd_fba_driver);
}
static void __exit

2
drivers/s390/block/dasd_int.h
View file

@ -513,12 +513,12 @@ void dasd_generic_remove (struct ccw_device *cdev);
int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
int dasd_generic_set_offline (struct ccw_device *cdev);
int dasd_generic_notify(struct ccw_device *, int);
void dasd_generic_auto_online (struct ccw_driver *);
/* externals in dasd_devmap.c */
extern int dasd_max_devindex;
extern int dasd_probeonly;
extern int dasd_autodetect;
extern int dasd_nopav;
int dasd_devmap_init(void);
void dasd_devmap_exit(void);

8
include/asm-s390/dasd.h
View file

@ -68,10 +68,12 @@ typedef struct dasd_information2_t {
* 0x00: default features
* 0x01: readonly (ro)
* 0x02: use diag discipline (diag)
* 0x04: set the device initially online (internal use only)
*/
#define DASD_FEATURE_DEFAULT 0
#define DASD_FEATURE_READONLY 1
#define DASD_FEATURE_USEDIAG 2
#define DASD_FEATURE_DEFAULT 0x00
#define DASD_FEATURE_READONLY 0x01
#define DASD_FEATURE_USEDIAG 0x02
#define DASD_FEATURE_INITIAL_ONLINE 0x04
#define DASD_PARTN_BITS 2