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linux/drivers/s390/cio/chsc.c
Cornelia Huck c48d865c50 [PATCH] s390: fix locking in __chp_add() and s390_subchannel_remove_chpid() 
Fix locking in __chp_add() and s390_subchannel_remove_chpid(): Need to
disable/enable because they are always called from a thread (and not
directly from a machine check...)

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-11 21:41:11 -08:00

1189 lines
26 KiB
C
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/*
* drivers/s390/cio/chsc.c
* S/390 common I/O routines -- channel subsystem call
*
* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <asm/cio.h>
#include "css.h"
#include "cio.h"
#include "cio_debug.h"
#include "ioasm.h"
#include "chsc.h"
static void *sei_page;
static int new_channel_path(int chpid);
static inline void
set_chp_logically_online(int chp, int onoff)
{
css[0]->chps[chp]->state = onoff;
}
static int
get_chp_status(int chp)
{
return (css[0]->chps[chp] ? css[0]->chps[chp]->state : -ENODEV);
}
void
chsc_validate_chpids(struct subchannel *sch)
{
int mask, chp;
for (chp = 0; chp <= 7; chp++) {
mask = 0x80 >> chp;
if (!get_chp_status(sch->schib.pmcw.chpid[chp]))
/* disable using this path */
sch->opm &= ~mask;
}
}
void
chpid_is_actually_online(int chp)
{
int state;
state = get_chp_status(chp);
if (state < 0) {
need_rescan = 1;
queue_work(slow_path_wq, &slow_path_work);
} else
WARN_ON(!state);
}
/* FIXME: this is _always_ called for every subchannel. shouldn't we
* process more than one at a time? */
static int
chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
{
int ccode, j;
struct {
struct chsc_header request;
u16 reserved1a:10;
u16 ssid:2;
u16 reserved1b:4;
u16 f_sch; /* first subchannel */
u16 reserved2;
u16 l_sch; /* last subchannel */
u32 reserved3;
struct chsc_header response;
u32 reserved4;
u8 sch_valid : 1;
u8 dev_valid : 1;
u8 st : 3; /* subchannel type */
u8 zeroes : 3;
u8 unit_addr; /* unit address */
u16 devno; /* device number */
u8 path_mask;
u8 fla_valid_mask;
u16 sch; /* subchannel */
u8 chpid[8]; /* chpids 0-7 */
u16 fla[8]; /* full link addresses 0-7 */
} *ssd_area;
ssd_area = page;
ssd_area->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x0004,
};
ssd_area->ssid = sch->schid.ssid;
ssd_area->f_sch = sch->schid.sch_no;
ssd_area->l_sch = sch->schid.sch_no;
ccode = chsc(ssd_area);
if (ccode > 0) {
pr_debug("chsc returned with ccode = %d\n", ccode);
return (ccode == 3) ? -ENODEV : -EBUSY;
}
switch (ssd_area->response.code) {
case 0x0001: /* everything ok */
break;
case 0x0002:
CIO_CRW_EVENT(2, "Invalid command!\n");
return -EINVAL;
case 0x0003:
CIO_CRW_EVENT(2, "Error in chsc request block!\n");
return -EINVAL;
case 0x0004:
CIO_CRW_EVENT(2, "Model does not provide ssd\n");
return -EOPNOTSUPP;
default:
CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
ssd_area->response.code);
return -EIO;
}
/*
* ssd_area->st stores the type of the detected
* subchannel, with the following definitions:
*
* 0: I/O subchannel: All fields have meaning
* 1: CHSC subchannel: Only sch_val, st and sch
* have meaning
* 2: Message subchannel: All fields except unit_addr
* have meaning
* 3: ADM subchannel: Only sch_val, st and sch
* have meaning
*
* Other types are currently undefined.
*/
if (ssd_area->st > 3) { /* uhm, that looks strange... */
CIO_CRW_EVENT(0, "Strange subchannel type %d"
" for sch 0.%x.%04x\n", ssd_area->st,
sch->schid.ssid, sch->schid.sch_no);
/*
* There may have been a new subchannel type defined in the
* time since this code was written; since we don't know which
* fields have meaning and what to do with it we just jump out
*/
return 0;
} else {
const char *type[4] = {"I/O", "chsc", "message", "ADM"};
CIO_CRW_EVENT(6, "ssd: sch 0.%x.%04x is %s subchannel\n",
sch->schid.ssid, sch->schid.sch_no,
type[ssd_area->st]);
sch->ssd_info.valid = 1;
sch->ssd_info.type = ssd_area->st;
}
if (ssd_area->st == 0 || ssd_area->st == 2) {
for (j = 0; j < 8; j++) {
if (!((0x80 >> j) & ssd_area->path_mask &
ssd_area->fla_valid_mask))
continue;
sch->ssd_info.chpid[j] = ssd_area->chpid[j];
sch->ssd_info.fla[j] = ssd_area->fla[j];
}
}
return 0;
}
int
css_get_ssd_info(struct subchannel *sch)
{
int ret;
void *page;
page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!page)
return -ENOMEM;
spin_lock_irq(&sch->lock);
ret = chsc_get_sch_desc_irq(sch, page);
if (ret) {
static int cio_chsc_err_msg;
if (!cio_chsc_err_msg) {
printk(KERN_ERR
"chsc_get_sch_descriptions:"
" Error %d while doing chsc; "
"processing some machine checks may "
"not work\n", ret);
cio_chsc_err_msg = 1;
}
}
spin_unlock_irq(&sch->lock);
free_page((unsigned long)page);
if (!ret) {
int j, chpid;
/* Allocate channel path structures, if needed. */
for (j = 0; j < 8; j++) {
chpid = sch->ssd_info.chpid[j];
if (chpid && (get_chp_status(chpid) < 0))
new_channel_path(chpid);
}
}
return ret;
}
static int
s390_subchannel_remove_chpid(struct device *dev, void *data)
{
int j;
int mask;
struct subchannel *sch;
struct channel_path *chpid;
struct schib schib;
sch = to_subchannel(dev);
chpid = data;
for (j = 0; j < 8; j++)
if (sch->schib.pmcw.chpid[j] == chpid->id)
break;
if (j >= 8)
return 0;
mask = 0x80 >> j;
spin_lock_irq(&sch->lock);
stsch(sch->schid, &schib);
if (!schib.pmcw.dnv)
goto out_unreg;
memcpy(&sch->schib, &schib, sizeof(struct schib));
/* Check for single path devices. */
if (sch->schib.pmcw.pim == 0x80)
goto out_unreg;
if (sch->vpm == mask)
goto out_unreg;
if ((sch->schib.scsw.actl & (SCSW_ACTL_CLEAR_PEND |
SCSW_ACTL_HALT_PEND |
SCSW_ACTL_START_PEND |
SCSW_ACTL_RESUME_PEND)) &&
(sch->schib.pmcw.lpum == mask)) {
int cc = cio_cancel(sch);
if (cc == -ENODEV)
goto out_unreg;
if (cc == -EINVAL) {
cc = cio_clear(sch);
if (cc == -ENODEV)
goto out_unreg;
/* Call handler. */
if (sch->driver && sch->driver->termination)
sch->driver->termination(&sch->dev);
goto out_unlock;
}
} else if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
(sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
(sch->schib.pmcw.lpum == mask)) {
int cc;
cc = cio_clear(sch);
if (cc == -ENODEV)
goto out_unreg;
/* Call handler. */
if (sch->driver && sch->driver->termination)
sch->driver->termination(&sch->dev);
goto out_unlock;
}
/* trigger path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
out_unlock:
spin_unlock_irq(&sch->lock);
return 0;
out_unreg:
spin_unlock_irq(&sch->lock);
sch->lpm = 0;
if (css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
return 0;
}
static inline void
s390_set_chpid_offline( __u8 chpid)
{
char dbf_txt[15];
struct device *dev;
sprintf(dbf_txt, "chpr%x", chpid);
CIO_TRACE_EVENT(2, dbf_txt);
if (get_chp_status(chpid) <= 0)
return;
dev = get_device(&css[0]->chps[chpid]->dev);
bus_for_each_dev(&css_bus_type, NULL, to_channelpath(dev),
s390_subchannel_remove_chpid);
if (need_rescan || css_slow_subchannels_exist())
queue_work(slow_path_wq, &slow_path_work);
put_device(dev);
}
struct res_acc_data {
struct channel_path *chp;
u32 fla_mask;
u16 fla;
};
static int
s390_process_res_acc_sch(struct res_acc_data *res_data, struct subchannel *sch)
{
int found;
int chp;
int ccode;
found = 0;
for (chp = 0; chp <= 7; chp++)
/*
* check if chpid is in information updated by ssd
*/
if (sch->ssd_info.valid &&
sch->ssd_info.chpid[chp] == res_data->chp->id &&
(sch->ssd_info.fla[chp] & res_data->fla_mask)
== res_data->fla) {
found = 1;
break;
}
if (found == 0)
return 0;
/*
* Do a stsch to update our subchannel structure with the
* new path information and eventually check for logically
* offline chpids.
*/
ccode = stsch(sch->schid, &sch->schib);
if (ccode > 0)
return 0;
return 0x80 >> chp;
}
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_err(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;
char dbf_txt[15];
sprintf(dbf_txt, "accpr%x", res_data->chp->id);
CIO_TRACE_EVENT( 2, dbf_txt);
if (res_data->fla != 0) {
sprintf(dbf_txt, "fla%x", res_data->fla);
CIO_TRACE_EVENT( 2, dbf_txt);
}
/*
* I/O resources may have become accessible.
* Scan through all subchannels that may be concerned and
* do a validation on those.
* The more information we have (info), the less scanning
* will we have to do.
*/
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;
}
static int
__get_chpid_from_lir(void *data)
{
struct lir {
u8 iq;
u8 ic;
u16 sci;
/* incident-node descriptor */
u32 indesc[28];
/* attached-node descriptor */
u32 andesc[28];
/* incident-specific information */
u32 isinfo[28];
} *lir;
lir = (struct lir*) data;
if (!(lir->iq&0x80))
/* NULL link incident record */
return -EINVAL;
if (!(lir->indesc[0]&0xc0000000))
/* node descriptor not valid */
return -EINVAL;
if (!(lir->indesc[0]&0x10000000))
/* don't handle device-type nodes - FIXME */
return -EINVAL;
/* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
return (u16) (lir->indesc[0]&0x000000ff);
}
int
chsc_process_crw(void)
{
int chpid, ret;
struct res_acc_data res_data;
struct {
struct chsc_header request;
u32 reserved1;
u32 reserved2;
u32 reserved3;
struct chsc_header response;
u32 reserved4;
u8 flags;
u8 vf; /* validity flags */
u8 rs; /* reporting source */
u8 cc; /* content code */
u16 fla; /* full link address */
u16 rsid; /* reporting source id */
u32 reserved5;
u32 reserved6;
u32 ccdf[96]; /* content-code dependent field */
/* ccdf has to be big enough for a link-incident record */
} *sei_area;
if (!sei_page)
return 0;
/*
* build the chsc request block for store event information
* and do the call
* This function is only called by the machine check handler thread,
* so we don't need locking for the sei_page.
*/
sei_area = sei_page;
CIO_TRACE_EVENT( 2, "prcss");
ret = 0;
do {
int ccode, status;
struct device *dev;
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,
};
ccode = chsc(sei_area);
if (ccode > 0)
return 0;
switch (sei_area->response.code) {
/* for debug purposes, check for problems */
case 0x0001:
CIO_CRW_EVENT(4, "chsc_process_crw: event information "
"successfully stored\n");
break; /* everything ok */
case 0x0002:
CIO_CRW_EVENT(2,
"chsc_process_crw: invalid command!\n");
return 0;
case 0x0003:
CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
"request block!\n");
return 0;
case 0x0005:
CIO_CRW_EVENT(2, "chsc_process_crw: no event "
"information stored\n");
return 0;
default:
CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
sei_area->response.code);
return 0;
}
/* Check if we might have lost some information. */
if (sei_area->flags & 0x40)
CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
"has been lost due to overflow!\n");
if (sei_area->rs != 4) {
CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
"(%04X) isn't a chpid!\n",
sei_area->rsid);
continue;
}
/* which kind of information was stored? */
switch (sei_area->cc) {
case 1: /* link incident*/
CIO_CRW_EVENT(4, "chsc_process_crw: "
"channel subsystem reports link incident,"
" reporting source is chpid %x\n",
sei_area->rsid);
chpid = __get_chpid_from_lir(sei_area->ccdf);
if (chpid < 0)
CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
__FUNCTION__);
else
s390_set_chpid_offline(chpid);
break;
case 2: /* i/o resource accessibiliy */
CIO_CRW_EVENT(4, "chsc_process_crw: "
"channel subsystem reports some I/O "
"devices may have become accessible\n");
pr_debug("Data received after sei: \n");
pr_debug("Validity flags: %x\n", sei_area->vf);
/* allocate a new channel path structure, if needed */
status = get_chp_status(sei_area->rsid);
if (status < 0)
new_channel_path(sei_area->rsid);
else if (!status)
break;
dev = get_device(&css[0]->chps[sei_area->rsid]->dev);
res_data.chp = to_channelpath(dev);
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;
}
}
ret = s390_process_res_acc(&res_data);
pr_debug("\n\n");
put_device(dev);
break;
default: /* other stuff */
CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
sei_area->cc);
break;
}
} while (sei_area->flags & 0x80);
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_irq(&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_irq(&sch->lock);
put_device(&sch->dev);
return 0;
}
static int
chp_add(int chpid)
{
int rc;
char dbf_txt[15];
struct device *dev;
if (!get_chp_status(chpid))
return 0; /* no need to do the rest */
sprintf(dbf_txt, "cadd%x", chpid);
CIO_TRACE_EVENT(2, dbf_txt);
dev = get_device(&css[0]->chps[chpid]->dev);
rc = for_each_subchannel(__chp_add, to_channelpath(dev));
if (css_slow_subchannels_exist())
rc = -EAGAIN;
if (rc != -EAGAIN)
rc = 0;
put_device(dev);
return rc;
}
/*
* Handling of crw machine checks with channel path source.
*/
int
chp_process_crw(int chpid, int on)
{
if (on == 0) {
/* Path has gone. We use the link incident routine.*/
s390_set_chpid_offline(chpid);
return 0; /* De-register is async anyway. */
}
/*
* Path has come. Allocate a new channel path structure,
* if needed.
*/
if (get_chp_status(chpid) < 0)
new_channel_path(chpid);
/* Avoid the extra overhead in process_rec_acc. */
return chp_add(chpid);
}
static inline int
__check_for_io_and_kill(struct subchannel *sch, int index)
{
int cc;
if (!device_is_online(sch))
/* cio could be doing I/O. */
return 0;
cc = stsch(sch->schid, &sch->schib);
if (cc)
return 0;
if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) {
device_set_waiting(sch);
return 1;
}
return 0;
}
static inline void
__s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
{
int chp, old_lpm;
unsigned long flags;
if (!sch->ssd_info.valid)
return;
spin_lock_irqsave(&sch->lock, flags);
old_lpm = sch->lpm;
for (chp = 0; chp < 8; chp++) {
if (sch->ssd_info.chpid[chp] != chpid)
continue;
if (on) {
sch->opm |= (0x80 >> chp);
sch->lpm |= (0x80 >> chp);
if (!old_lpm)
device_trigger_reprobe(sch);
else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
} else {
sch->opm &= ~(0x80 >> chp);
sch->lpm &= ~(0x80 >> chp);
/*
* Give running I/O a grace period in which it
* can successfully terminate, even using the
* just varied off path. Then kill it.
*/
if (!__check_for_io_and_kill(sch, chp) && !sch->lpm) {
if (css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
} else if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
}
break;
}
spin_unlock_irqrestore(&sch->lock, flags);
}
static int
s390_subchannel_vary_chpid_off(struct device *dev, void *data)
{
struct subchannel *sch;
__u8 *chpid;
sch = to_subchannel(dev);
chpid = data;
__s390_subchannel_vary_chpid(sch, *chpid, 0);
return 0;
}
static int
s390_subchannel_vary_chpid_on(struct device *dev, void *data)
{
struct subchannel *sch;
__u8 *chpid;
sch = to_subchannel(dev);
chpid = data;
__s390_subchannel_vary_chpid(sch, *chpid, 1);
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_err(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
*/
static int
s390_vary_chpid( __u8 chpid, int on)
{
char dbf_text[15];
int status;
sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
CIO_TRACE_EVENT( 2, dbf_text);
status = get_chp_status(chpid);
if (status < 0) {
printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
return -EINVAL;
}
if (!on && !status) {
printk(KERN_ERR "chpid %x is already offline\n", chpid);
return -EINVAL;
}
set_chp_logically_online(chpid, on);
/*
* Redo PathVerification on the devices the chpid connects to
*/
bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
s390_subchannel_vary_chpid_on :
s390_subchannel_vary_chpid_off);
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;
}
/*
* Files for the channel path entries.
*/
static ssize_t
chp_status_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct channel_path *chp = container_of(dev, struct channel_path, dev);
if (!chp)
return 0;
return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
sprintf(buf, "offline\n"));
}
static ssize_t
chp_status_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct channel_path *cp = container_of(dev, struct channel_path, dev);
char cmd[10];
int num_args;
int error;
num_args = sscanf(buf, "%5s", cmd);
if (!num_args)
return count;
if (!strnicmp(cmd, "on", 2))
error = s390_vary_chpid(cp->id, 1);
else if (!strnicmp(cmd, "off", 3))
error = s390_vary_chpid(cp->id, 0);
else
error = -EINVAL;
return error < 0 ? error : count;
}
static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
static ssize_t
chp_type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct channel_path *chp = container_of(dev, struct channel_path, dev);
if (!chp)
return 0;
return sprintf(buf, "%x\n", chp->desc.desc);
}
static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
static struct attribute * chp_attrs[] = {
&dev_attr_status.attr,
&dev_attr_type.attr,
NULL,
};
static struct attribute_group chp_attr_group = {
.attrs = chp_attrs,
};
static void
chp_release(struct device *dev)
{
struct channel_path *cp;
cp = container_of(dev, struct channel_path, dev);
kfree(cp);
}
static int
chsc_determine_channel_path_description(int chpid,
struct channel_path_desc *desc)
{
int ccode, ret;
struct {
struct chsc_header request;
u32 : 24;
u32 first_chpid : 8;
u32 : 24;
u32 last_chpid : 8;
u32 zeroes1;
struct chsc_header response;
u32 zeroes2;
struct channel_path_desc desc;
} *scpd_area;
scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!scpd_area)
return -ENOMEM;
scpd_area->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x0002,
};
scpd_area->first_chpid = chpid;
scpd_area->last_chpid = chpid;
ccode = chsc(scpd_area);
if (ccode > 0) {
ret = (ccode == 3) ? -ENODEV : -EBUSY;
goto out;
}
switch (scpd_area->response.code) {
case 0x0001: /* Success. */
memcpy(desc, &scpd_area->desc,
sizeof(struct channel_path_desc));
ret = 0;
break;
case 0x0003: /* Invalid block. */
case 0x0007: /* Invalid format. */
case 0x0008: /* Other invalid block. */
CIO_CRW_EVENT(2, "Error in chsc request block!\n");
ret = -EINVAL;
break;
case 0x0004: /* Command not provided in model. */
CIO_CRW_EVENT(2, "Model does not provide scpd\n");
ret = -EOPNOTSUPP;
break;
default:
CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
scpd_area->response.code);
ret = -EIO;
}
out:
free_page((unsigned long)scpd_area);
return ret;
}
/*
* Entries for chpids on the system bus.
* This replaces /proc/chpids.
*/
static int
new_channel_path(int chpid)
{
struct channel_path *chp;
int ret;
chp = kmalloc(sizeof(struct channel_path), GFP_KERNEL);
if (!chp)
return -ENOMEM;
memset(chp, 0, sizeof(struct channel_path));
/* fill in status, etc. */
chp->id = chpid;
chp->state = 1;
chp->dev = (struct device) {
.parent = &css[0]->device,
.release = chp_release,
};
snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
/* Obtain channel path description and fill it in. */
ret = chsc_determine_channel_path_description(chpid, &chp->desc);
if (ret)
goto out_free;
/* make it known to the system */
ret = device_register(&chp->dev);
if (ret) {
printk(KERN_WARNING "%s: could not register %02x\n",
__func__, chpid);
goto out_free;
}
ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
if (ret) {
device_unregister(&chp->dev);
goto out_free;
} else
css[0]->chps[chpid] = chp;
return ret;
out_free:
kfree(chp);
return ret;
}
void *
chsc_get_chp_desc(struct subchannel *sch, int chp_no)
{
struct channel_path *chp;
struct channel_path_desc *desc;
chp = css[0]->chps[sch->schib.pmcw.chpid[chp_no]];
if (!chp)
return NULL;
desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
if (!desc)
return NULL;
memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
return desc;
}
static int __init
chsc_alloc_sei_area(void)
{
sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!sei_page)
printk(KERN_WARNING"Can't allocate page for processing of " \
"chsc machine checks!\n");
return (sei_page ? 0 : -ENOMEM);
}
int __init
chsc_enable_facility(int operation_code)
{
int ret;
struct {
struct chsc_header request;
u8 reserved1:4;
u8 format:4;
u8 reserved2;
u16 operation_code;
u32 reserved3;
u32 reserved4;
u32 operation_data_area[252];
struct chsc_header response;
u32 reserved5:4;
u32 format2:4;
u32 reserved6:24;
} *sda_area;
sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
if (!sda_area)
return -ENOMEM;
sda_area->request = (struct chsc_header) {
.length = 0x0400,
.code = 0x0031,
};
sda_area->operation_code = operation_code;
ret = chsc(sda_area);
if (ret > 0) {
ret = (ret == 3) ? -ENODEV : -EBUSY;
goto out;
}
switch (sda_area->response.code) {
case 0x0003: /* invalid request block */
case 0x0007:
ret = -EINVAL;
break;
case 0x0004: /* command not provided */
case 0x0101: /* facility not provided */
ret = -EOPNOTSUPP;
break;
}
out:
free_page((unsigned long)sda_area);
return ret;
}
subsys_initcall(chsc_alloc_sei_area);
struct css_general_char css_general_characteristics;
struct css_chsc_char css_chsc_characteristics;
int __init
chsc_determine_css_characteristics(void)
{
int result;
struct {
struct chsc_header request;
u32 reserved1;
u32 reserved2;
u32 reserved3;
struct chsc_header response;
u32 reserved4;
u32 general_char[510];
u32 chsc_char[518];
} *scsc_area;
scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!scsc_area) {
printk(KERN_WARNING"cio: Was not able to determine available" \
"CHSCs due to no memory.\n");
return -ENOMEM;
}
scsc_area->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x0010,
};
result = chsc(scsc_area);
if (result) {
printk(KERN_WARNING"cio: Was not able to determine " \
"available CHSCs, cc=%i.\n", result);
result = -EIO;
goto exit;
}
if (scsc_area->response.code != 1) {
printk(KERN_WARNING"cio: Was not able to determine " \
"available CHSCs.\n");
result = -EIO;
goto exit;
}
memcpy(&css_general_characteristics, scsc_area->general_char,
sizeof(css_general_characteristics));
memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
sizeof(css_chsc_characteristics));
exit:
free_page ((unsigned long) scsc_area);
return result;
}
EXPORT_SYMBOL_GPL(css_general_characteristics);
EXPORT_SYMBOL_GPL(css_chsc_characteristics);
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