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[PATCH] s390: introduce for_each_subchannel

Browse source 
for_each_subchannel() is an iterator calling a function for every possible
subchannel id until non-zero is returned.  Convert the current iterating
functions to it.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Cornelia Huck 2006-01-06 00:19:22 -08:00 committed by Linus Torvalds
parent a8237fc410
commit f97a56fb76
5 changed files with 318 additions and 290 deletions
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44
drivers/s390/cio/blacklist.c
View file

@ -219,6 +219,27 @@ is_blacklisted (int devno)
}
#ifdef CONFIG_PROC_FS
static int
__s390_redo_validation(struct subchannel_id schid, void *data)
{
int ret;
struct subchannel *sch;
sch = get_subchannel_by_schid(schid);
if (sch) {
/* Already known. */
put_device(&sch->dev);
return 0;
}
ret = css_probe_device(schid);
if (ret == -ENXIO)
return ret; /* We're through. */
if (ret == -ENOMEM)
/* Stop validation for now. Bad, but no need for a panic. */
return ret;
return 0;
}
/*
* Function: s390_redo_validation
* Look for no longer blacklisted devices
@ -226,30 +247,9 @@ is_blacklisted (int devno)
static inline void
s390_redo_validation (void)
{
struct subchannel_id schid;
CIO_TRACE_EVENT (0, "redoval");
init_subchannel_id(&schid);
do {
int ret;
struct subchannel *sch;
sch = get_subchannel_by_schid(schid);
if (sch) {
/* Already known. */
put_device(&sch->dev);
continue;
}
ret = css_probe_device(schid);
if (ret == -ENXIO)
break; /* We're through. */
if (ret == -ENOMEM)
/*
* Stop validation for now. Bad, but no need for a
* panic.
*/
break;
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
for_each_subchannel(__s390_redo_validation, NULL);
}
/*

374
drivers/s390/cio/chsc.c
View file

@ -310,9 +310,14 @@ s390_set_chpid_offline( __u8 chpid)
queue_work(slow_path_wq, &slow_path_work);
}
struct res_acc_data {
struct channel_path *chp;
u32 fla_mask;
u16 fla;
};
static int
s390_process_res_acc_sch(u8 chpid, __u16 fla, u32 fla_mask,
struct subchannel *sch)
s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
{
int found;
int chp;
@ -324,8 +329,9 @@ s390_process_res_acc_sch(u8 chpid, __u16 fla, u32 fla_mask,
* check if chpid is in information updated by ssd
*/
if (sch->ssd_info.valid &&
sch->ssd_info.chpid[chp] == chpid &&
(sch->ssd_info.fla[chp] & fla_mask) == fla) {
sch->ssd_info.chpid[chp] == res_data->chp->id &&
(sch->ssd_info.fla[chp] & res_data->fla_mask)
== res_data->fla) {
found = 1;
break;
}
@ -345,18 +351,80 @@ s390_process_res_acc_sch(u8 chpid, __u16 fla, u32 fla_mask,
return 0x80 >> chp;
}
static int
s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
static inline int
s390_process_res_acc_new_sch(struct subchannel_id schid)
{
struct schib schib;
int ret;
/*
* We don't know the device yet, but since a path
* may be available now to the device we'll have
* to do recognition again.
* Since we don't have any idea about which chpid
* that beast may be on we'll have to do a stsch
* on all devices, grr...
*/
if (stsch(schid, &schib))
/* We're through */
return need_rescan ? -EAGAIN : -ENXIO;
/* Put it on the slow path. */
ret = css_enqueue_subchannel_slow(schid);
if (ret) {
css_clear_subchannel_slow_list();
need_rescan = 1;
return -EAGAIN;
}
return 0;
}
static int
__s390_process_res_acc(struct subchannel_id schid, void *data)
{
int chp_mask, old_lpm;
struct res_acc_data *res_data;
struct subchannel *sch;
res_data = (struct res_acc_data *)data;
sch = get_subchannel_by_schid(schid);
if (!sch)
/* Check if a subchannel is newly available. */
return s390_process_res_acc_new_sch(schid);
spin_lock_irq(&sch->lock);
chp_mask = s390_process_res_acc_sch(res_data, sch);
if (chp_mask == 0) {
spin_unlock_irq(&sch->lock);
return 0;
}
old_lpm = sch->lpm;
sch->lpm = ((sch->schib.pmcw.pim &
sch->schib.pmcw.pam &
sch->schib.pmcw.pom)
| chp_mask) & sch->opm;
if (!old_lpm && sch->lpm)
device_trigger_reprobe(sch);
else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
spin_unlock_irq(&sch->lock);
put_device(&sch->dev);
return (res_data->fla_mask == 0xffff) ? -ENODEV : 0;
}
static int
s390_process_res_acc (struct res_acc_data *res_data)
{
int rc;
struct subchannel_id schid;
char dbf_txt[15];
sprintf(dbf_txt, "accpr%x", chpid);
sprintf(dbf_txt, "accpr%x", res_data->chp->id);
CIO_TRACE_EVENT( 2, dbf_txt);
if (fla != 0) {
sprintf(dbf_txt, "fla%x", fla);
if (res_data->fla != 0) {
sprintf(dbf_txt, "fla%x", res_data->fla);
CIO_TRACE_EVENT( 2, dbf_txt);
}
@ -367,71 +435,11 @@ s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
* The more information we have (info), the less scanning
* will we have to do.
*/
if (!get_chp_status(chpid))
return 0; /* no need to do the rest */
rc = 0;
init_subchannel_id(&schid);
do {
int chp_mask, old_lpm;
sch = get_subchannel_by_schid(schid);
if (!sch) {
struct schib schib;
int ret;
/*
* We don't know the device yet, but since a path
* may be available now to the device we'll have
* to do recognition again.
* Since we don't have any idea about which chpid
* that beast may be on we'll have to do a stsch
* on all devices, grr...
*/
if (stsch(schid, &schib)) {
/* We're through */
if (need_rescan)
rc = -EAGAIN;
break;
}
if (need_rescan) {
rc = -EAGAIN;
continue;
}
/* Put it on the slow path. */
ret = css_enqueue_subchannel_slow(schid);
if (ret) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
rc = -EAGAIN;
continue;
}
spin_lock_irq(&sch->lock);
chp_mask = s390_process_res_acc_sch(chpid, fla, fla_mask, sch);
if (chp_mask == 0) {
spin_unlock_irq(&sch->lock);
continue;
}
old_lpm = sch->lpm;
sch->lpm = ((sch->schib.pmcw.pim &
sch->schib.pmcw.pam &
sch->schib.pmcw.pom)
| chp_mask) & sch->opm;
if (!old_lpm && sch->lpm)
device_trigger_reprobe(sch);
else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
spin_unlock_irq(&sch->lock);
put_device(&sch->dev);
if (fla_mask == 0xffff)
break;
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
rc = for_each_subchannel(__s390_process_res_acc, res_data);
if (css_slow_subchannels_exist())
rc = -EAGAIN;
else if (rc != -EAGAIN)
rc = 0;
return rc;
}
@ -469,6 +477,7 @@ int
chsc_process_crw(void)
{
int chpid, ret;
struct res_acc_data res_data;
struct {
struct chsc_header request;
u32 reserved1;
@ -503,7 +512,7 @@ chsc_process_crw(void)
do {
int ccode, status;
memset(sei_area, 0, sizeof(*sei_area));
memset(&res_data, 0, sizeof(struct res_acc_data));
sei_area->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x000e,
@ -576,26 +585,23 @@ chsc_process_crw(void)
if (status < 0)
new_channel_path(sei_area->rsid);
else if (!status)
return 0;
if ((sei_area->vf & 0x80) == 0) {
pr_debug("chpid: %x\n", sei_area->rsid);
ret = s390_process_res_acc(sei_area->rsid,
0, 0);
} else if ((sei_area->vf & 0xc0) == 0x80) {
pr_debug("chpid: %x link addr: %x\n",
sei_area->rsid, sei_area->fla);
ret = s390_process_res_acc(sei_area->rsid,
sei_area->fla,
0xff00);
} else if ((sei_area->vf & 0xc0) == 0xc0) {
pr_debug("chpid: %x full link addr: %x\n",
sei_area->rsid, sei_area->fla);
ret = s390_process_res_acc(sei_area->rsid,
sei_area->fla,
0xffff);
break;
res_data.chp = chps[sei_area->rsid];
pr_debug("chpid: %x", sei_area->rsid);
if ((sei_area->vf & 0xc0) != 0) {
res_data.fla = sei_area->fla;
if ((sei_area->vf & 0xc0) == 0xc0) {
pr_debug(" full link addr: %x",
sei_area->fla);
res_data.fla_mask = 0xffff;
} else {
pr_debug(" link addr: %x",
sei_area->fla);
res_data.fla_mask = 0xff00;
}
}
pr_debug("\n");
ret = s390_process_res_acc(&res_data);
pr_debug("\n\n");
break;
default: /* other stuff */
@ -607,12 +613,70 @@ chsc_process_crw(void)
return ret;
}
static inline int
__chp_add_new_sch(struct subchannel_id schid)
{
struct schib schib;
int ret;
if (stsch(schid, &schib))
/* We're through */
return need_rescan ? -EAGAIN : -ENXIO;
/* Put it on the slow path. */
ret = css_enqueue_subchannel_slow(schid);
if (ret) {
css_clear_subchannel_slow_list();
need_rescan = 1;
return -EAGAIN;
}
return 0;
}
static int
__chp_add(struct subchannel_id schid, void *data)
{
int i;
struct channel_path *chp;
struct subchannel *sch;
chp = (struct channel_path *)data;
sch = get_subchannel_by_schid(schid);
if (!sch)
/* Check if the subchannel is now available. */
return __chp_add_new_sch(schid);
spin_lock(&sch->lock);
for (i=0; i<8; i++)
if (sch->schib.pmcw.chpid[i] == chp->id) {
if (stsch(sch->schid, &sch->schib) != 0) {
/* Endgame. */
spin_unlock(&sch->lock);
return -ENXIO;
}
break;
}
if (i==8) {
spin_unlock(&sch->lock);
return 0;
}
sch->lpm = ((sch->schib.pmcw.pim &
sch->schib.pmcw.pam &
sch->schib.pmcw.pom)
| 0x80 >> i) & sch->opm;
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
spin_unlock(&sch->lock);
put_device(&sch->dev);
return 0;
}
static int
chp_add(int chpid)
{
struct subchannel *sch;
int ret, rc;
struct subchannel_id schid;
int rc;
char dbf_txt[15];
if (!get_chp_status(chpid))
@ -621,60 +685,11 @@ chp_add(int chpid)
sprintf(dbf_txt, "cadd%x", chpid);
CIO_TRACE_EVENT(2, dbf_txt);
rc = 0;
init_subchannel_id(&schid);
do {
int i;
sch = get_subchannel_by_schid(schid);
if (!sch) {
struct schib schib;
if (stsch(schid, &schib)) {
/* We're through */
if (need_rescan)
rc = -EAGAIN;
break;
}
if (need_rescan) {
rc = -EAGAIN;
continue;
}
/* Put it on the slow path. */
ret = css_enqueue_subchannel_slow(schid);
if (ret) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
rc = -EAGAIN;
continue;
}
spin_lock(&sch->lock);
for (i=0; i<8; i++)
if (sch->schib.pmcw.chpid[i] == chpid) {
if (stsch(sch->schid, &sch->schib) != 0) {
/* Endgame. */
spin_unlock(&sch->lock);
return rc;
}
break;
}
if (i==8) {
spin_unlock(&sch->lock);
return rc;
}
sch->lpm = ((sch->schib.pmcw.pim &
sch->schib.pmcw.pam &
sch->schib.pmcw.pom)
| 0x80 >> i) & sch->opm;
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
spin_unlock(&sch->lock);
put_device(&sch->dev);
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
rc = for_each_subchannel(__chp_add, chps[chpid]);
if (css_slow_subchannels_exist())
rc = -EAGAIN;
if (rc != -EAGAIN)
rc = 0;
return rc;
}
@ -786,6 +801,29 @@ s390_subchannel_vary_chpid_on(struct device *dev, void *data)
return 0;
}
static int
__s390_vary_chpid_on(struct subchannel_id schid, void *data)
{
struct schib schib;
struct subchannel *sch;
sch = get_subchannel_by_schid(schid);
if (sch) {
put_device(&sch->dev);
return 0;
}
if (stsch(schid, &schib))
/* We're through */
return -ENXIO;
/* Put it on the slow path. */
if (css_enqueue_subchannel_slow(schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
return -EAGAIN;
}
return 0;
}
/*
* Function: s390_vary_chpid
* Varies the specified chpid online or offline
@ -794,9 +832,7 @@ static int
s390_vary_chpid( __u8 chpid, int on)
{
char dbf_text[15];
int status, ret;
struct subchannel_id schid;
struct subchannel *sch;
int status;
sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
CIO_TRACE_EVENT( 2, dbf_text);
@ -821,31 +857,9 @@ s390_vary_chpid( __u8 chpid, int on)
bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
s390_subchannel_vary_chpid_on :
s390_subchannel_vary_chpid_off);
if (!on)
goto out;
/* Scan for new devices on varied on path. */
init_subchannel_id(&schid);
do {
struct schib schib;
if (need_rescan)
break;
sch = get_subchannel_by_schid(schid);
if (sch) {
put_device(&sch->dev);
continue;
}
if (stsch(schid, &schib))
/* We're through */
break;
/* Put it on the slow path. */
ret = css_enqueue_subchannel_slow(schid);
if (ret) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
out:
if (on)
/* Scan for new devices on varied on path. */
for_each_subchannel(__s390_vary_chpid_on, NULL);
if (need_rescan || css_slow_subchannels_exist())
queue_work(slow_path_wq, &slow_path_work);
return 0;

79
drivers/s390/cio/cio.c
View file

@ -691,7 +691,22 @@ wait_cons_dev (void)
}
static int
cio_console_irq(void)
cio_test_for_console(struct subchannel_id schid, void *data)
{
if (stsch(schid, &console_subchannel.schib) != 0)
return -ENXIO;
if (console_subchannel.schib.pmcw.dnv &&
console_subchannel.schib.pmcw.dev ==
console_devno) {
console_irq = schid.sch_no;
return 1; /* found */
}
return 0;
}
static int
cio_get_console_sch_no(void)
{
struct subchannel_id schid;
@ -705,16 +720,7 @@ cio_console_irq(void)
console_devno = console_subchannel.schib.pmcw.dev;
} else if (console_devno != -1) {
/* At least the console device number is known. */
do {
if (stsch(schid, &console_subchannel.schib) != 0)
break;
if (console_subchannel.schib.pmcw.dnv &&
console_subchannel.schib.pmcw.dev ==
console_devno) {
console_irq = schid.sch_no;
break;
}
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
for_each_subchannel(cio_test_for_console, NULL);
if (console_irq == -1)
return -1;
} else {
@ -730,19 +736,19 @@ cio_console_irq(void)
struct subchannel *
cio_probe_console(void)
{
int irq, ret;
int sch_no, ret;
struct subchannel_id schid;
if (xchg(&console_subchannel_in_use, 1) != 0)
return ERR_PTR(-EBUSY);
irq = cio_console_irq();
if (irq == -1) {
sch_no = cio_get_console_sch_no();
if (sch_no == -1) {
console_subchannel_in_use = 0;
return ERR_PTR(-ENODEV);
}
memset(&console_subchannel, 0, sizeof(struct subchannel));
init_subchannel_id(&schid);
schid.sch_no = irq;
schid.sch_no = sch_no;
ret = cio_validate_subchannel(&console_subchannel, schid);
if (ret) {
console_subchannel_in_use = 0;
@ -830,32 +836,33 @@ __clear_subchannel_easy(struct subchannel_id schid)
}
extern void do_reipl(unsigned long devno);
static int
__shutdown_subchannel_easy(struct subchannel_id schid, void *data)
{
struct schib schib;
if (stsch(schid, &schib))
return -ENXIO;
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
return 0;
}
/* Clear all subchannels. */
void
clear_all_subchannels(void)
{
struct subchannel_id schid;
local_irq_disable();
init_subchannel_id(&schid);
do {
struct schib schib;
if (stsch(schid, &schib))
break; /* break out of the loop */
if (!schib.pmcw.ena)
continue;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... jump out of switch */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
for_each_subchannel(__shutdown_subchannel_easy, NULL);
}
/* Make sure all subchannels are quiet before we re-ipl an lpar. */

110
drivers/s390/cio/css.c
View file

@ -21,7 +21,6 @@
#include "ioasm.h"
#include "chsc.h"
unsigned int highest_subchannel;
int need_rescan = 0;
int css_init_done = 0;
@ -32,6 +31,22 @@ struct device css_bus_device = {
.bus_id = "css0",
};
inline int
for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
{
struct subchannel_id schid;
int ret;
init_subchannel_id(&schid);
ret = -ENODEV;
do {
ret = fn(schid, data);
if (ret)
break;
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
return ret;
}
static struct subchannel *
css_alloc_subchannel(struct subchannel_id schid)
{
@ -280,25 +295,10 @@ css_evaluate_subchannel(struct subchannel_id schid, int slow)
return ret;
}
static void
css_rescan_devices(void)
static int
css_rescan_devices(struct subchannel_id schid, void *data)
{
int ret;
struct subchannel_id schid;
init_subchannel_id(&schid);
do {
ret = css_evaluate_subchannel(schid, 1);
/* No more memory. It doesn't make sense to continue. No
* panic because this can happen in midflight and just
* because we can't use a new device is no reason to crash
* the system. */
if (ret == -ENOMEM)
break;
/* -ENXIO indicates that there are no more subchannels. */
if (ret == -ENXIO)
break;
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
return css_evaluate_subchannel(schid, 1);
}
struct slow_subchannel {
@ -316,7 +316,7 @@ css_trigger_slow_path(void)
if (need_rescan) {
need_rescan = 0;
css_rescan_devices();
for_each_subchannel(css_rescan_devices, NULL);
return;
}
@ -383,6 +383,43 @@ css_process_crw(int irq)
return ret;
}
static int __init
__init_channel_subsystem(struct subchannel_id schid, void *data)
{
struct subchannel *sch;
int ret;
if (cio_is_console(schid))
sch = cio_get_console_subchannel();
else {
sch = css_alloc_subchannel(schid);
if (IS_ERR(sch))
ret = PTR_ERR(sch);
else
ret = 0;
switch (ret) {
case 0:
break;
case -ENOMEM:
panic("Out of memory in init_channel_subsystem\n");
/* -ENXIO: no more subchannels. */
case -ENXIO:
return ret;
default:
return 0;
}
}
/*
* We register ALL valid subchannels in ioinfo, even those
* that have been present before init_channel_subsystem.
* These subchannels can't have been registered yet (kmalloc
* not working) so we do it now. This is true e.g. for the
* console subchannel.
*/
css_register_subchannel(sch);
return 0;
}
static void __init
css_generate_pgid(void)
{
@ -410,7 +447,6 @@ static int __init
init_channel_subsystem (void)
{
int ret;
struct subchannel_id schid;
if (chsc_determine_css_characteristics() == 0)
css_characteristics_avail = 1;
@ -426,38 +462,8 @@ init_channel_subsystem (void)
ctl_set_bit(6, 28);
init_subchannel_id(&schid);
do {
struct subchannel *sch;
if (cio_is_console(schid))
sch = cio_get_console_subchannel();
else {
sch = css_alloc_subchannel(schid);
if (IS_ERR(sch))
ret = PTR_ERR(sch);
else
ret = 0;
if (ret == -ENOMEM)
panic("Out of memory in "
"init_channel_subsystem\n");
/* -ENXIO: no more subchannels. */
if (ret == -ENXIO)
break;
if (ret)
continue;
}
/*
* We register ALL valid subchannels in ioinfo, even those
* that have been present before init_channel_subsystem.
* These subchannels can't have been registered yet (kmalloc
* not working) so we do it now. This is true e.g. for the
* console subchannel.
*/
css_register_subchannel(sch);
} while (schid.sch_no++ < __MAX_SUBCHANNEL);
for_each_subchannel(__init_channel_subsystem, NULL);
return 0;
out_bus:
bus_unregister(&css_bus_type);
out:

1
drivers/s390/cio/css.h
View file

@ -126,6 +126,7 @@ extern struct css_driver io_subchannel_driver;
extern int css_probe_device(struct subchannel_id);
extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
extern int css_init_done;
extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
#define __MAX_SUBCHANNEL 65535