// SPDX-License-Identifier: GPL-2.0
/*
* S/390 common I/O routines -- channel subsystem call
*
* Copyright IBM Corp. 1999,2012
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
*/
#define KMSG_COMPONENT "cio"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <asm/cio.h>
#include <asm/chpid.h>
#include <asm/chsc.h>
#include <asm/crw.h>
#include <asm/isc.h>
#include <asm/ebcdic.h>
#include <asm/ap.h>
#include "css.h"
#include "cio.h"
#include "cio_debug.h"
#include "ioasm.h"
#include "chp.h"
#include "chsc.h"
static void *sei_page;
static void *chsc_page;
static DEFINE_SPINLOCK(chsc_page_lock);
#define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */
#define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */
/**
* chsc_error_from_response() - convert a chsc response to an error
* @response: chsc response code
*
* Returns an appropriate Linux error code for @response.
*/
int chsc_error_from_response(int response)
{
switch (response) {
case 0x0001:
return 0;
case 0x0002:
case 0x0003:
case 0x0006:
case 0x0007:
case 0x0008:
case 0x000a:
case 0x0104:
return -EINVAL;
case 0x0004:
case 0x0106: /* "Wrong Channel Parm" for the op 0x003d */
return -EOPNOTSUPP;
case 0x000b:
case 0x0107: /* "Channel busy" for the op 0x003d */
return -EBUSY;
case 0x0100:
case 0x0102:
return -ENOMEM;
case 0x0108: /* "HW limit exceeded" for the op 0x003d */
return -EUSERS;
default:
return -EIO;
}
}
EXPORT_SYMBOL_GPL(chsc_error_from_response);
struct chsc_ssd_area {
struct chsc_header request;
u16 :10;
u16 ssid:2;
u16 :4;
u16 f_sch; /* first subchannel */
u16 :16;
u16 l_sch; /* last subchannel */
u32 :32;
struct chsc_header response;
u32 :32;
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 */
} __packed __aligned(PAGE_SIZE);
int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
{
struct chsc_ssd_area *ssd_area;
unsigned long flags;
int ccode;
int ret;
int i;
int mask;
spin_lock_irqsave(&chsc_page_lock, flags);
memset(chsc_page, 0, PAGE_SIZE);
ssd_area = chsc_page;
ssd_area->request.length = 0x0010;
ssd_area->request.code = 0x0004;
ssd_area->ssid = schid.ssid;
ssd_area->f_sch = schid.sch_no;
ssd_area->l_sch = schid.sch_no;
ccode = chsc(ssd_area);
/* Check response. */
if (ccode > 0) {
ret = (ccode == 3) ? -ENODEV : -EBUSY;
goto out;
}
ret = chsc_error_from_response(ssd_area->response.code);
if (ret != 0) {
CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
schid.ssid, schid.sch_no,
ssd_area->response.code);
goto out;
}
if (!ssd_area->sch_valid) {
ret = -ENODEV;
goto out;
}
/* Copy data */
ret = 0;
memset(ssd, 0, sizeof(struct chsc_ssd_info));
if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
(ssd_area->st != SUBCHANNEL_TYPE_MSG))
goto out;
ssd->path_mask = ssd_area->path_mask;
ssd->fla_valid_mask = ssd_area->fla_valid_mask;
for (i = 0; i < 8; i++) {
mask = 0x80 >> i;
if (ssd_area->path_mask & mask) {
chp_id_init(&ssd->chpid[i]);
ssd->chpid[i].id = ssd_area->chpid[i];
}
if (ssd_area->fla_valid_mask & mask)
ssd->fla[i] = ssd_area->fla[i];
}
out:
spin_unlock_irqrestore(&chsc_page_lock, flags);
return ret;
}
/**
* chsc_ssqd() - store subchannel QDIO data (SSQD)
* @schid: id of the subchannel on which SSQD is performed
* @ssqd: request and response block for SSQD
*
* Returns 0 on success.
*/
int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
{
memset(ssqd, 0, sizeof(*ssqd));
ssqd->request.length = 0x0010;
ssqd->request.code = 0x0024;
ssqd->first_sch = schid.sch_no;
ssqd->last_sch = schid.sch_no;
ssqd->ssid = schid.ssid;
if (chsc(ssqd))
return -EIO;
return chsc_error_from_response(ssqd->response.code);
}
EXPORT_SYMBOL_GPL(chsc_ssqd);
/**
* chsc_sadc() - set adapter device controls (SADC)
* @schid: id of the subchannel on which SADC is performed
* @scssc: request and response block for SADC
* @summary_indicator_addr: summary indicator address
* @subchannel_indicator_addr: subchannel indicator address
* @isc: Interruption Subclass for this subchannel
*
* Returns 0 on success.
*/
int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
{
memset(scssc, 0, sizeof(*scssc));
scssc->request.length = 0x0fe0;
scssc->request.code = 0x0021;
scssc->operation_code = 0;
scssc->summary_indicator_addr = summary_indicator_addr;
scssc->subchannel_indicator_addr = subchannel_indicator_addr;
scssc->ks = PAGE_DEFAULT_KEY >> 4;
scssc->kc = PAGE_DEFAULT_KEY >> 4;
scssc->isc = isc;
scssc->schid = schid;
/* enable the time delay disablement facility */
if (css_general_characteristics.aif_tdd)
scssc->word_with_d_bit = 0x10000000;
if (chsc(scssc))
return -EIO;
return chsc_error_from_response(scssc->response.code);
}
EXPORT_SYMBOL_GPL(chsc_sadc);
static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
{
spin_lock_irq(sch->lock);
if (sch->driver && sch->driver->chp_event)
if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
goto out_unreg;
spin_unlock_irq(sch->lock);
return 0;
out_unreg:
sch->lpm = 0;
spin_unlock_irq(sch->lock);
css_schedule_eval(sch->schid);
return 0;
}
void chsc_chp_offline(struct chp_id chpid)
{
struct channel_path *chp = chpid_to_chp(chpid);
struct chp_link link;
char dbf_txt[15];
sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
CIO_TRACE_EVENT(2, dbf_txt);
if (chp_get_status(chpid) <= 0)
return;
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
mutex_lock(&chp->lock);
chp_update_desc(chp);
mutex_unlock(&chp->lock);
for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
}
static int __s390_process_res_acc(struct subchannel *sch, void *data)
{
spin_lock_irq(sch->lock);
if (sch->driver && sch->driver->chp_event)
sch->driver->chp_event(sch, data, CHP_ONLINE);
spin_unlock_irq(sch->lock);
return 0;
}
static void s390_process_res_acc(struct chp_link *link)
{
char dbf_txt[15];
sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
link->chpid.id);
CIO_TRACE_EVENT( 2, dbf_txt);
if (link->fla != 0) {
sprintf(dbf_txt, "fla%x", link->fla);
CIO_TRACE_EVENT( 2, dbf_txt);
}
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
/*
* 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.
*/
for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
css_schedule_reprobe();
}
static int process_fces_event(struct subchannel *sch, void *data)
{
spin_lock_irq(sch->lock);
if (sch->driver && sch->driver->chp_event)
sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
spin_unlock_irq(sch->lock);
return 0;
}
struct chsc_sei_nt0_area {
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 reserved1;
u32 reserved2;
/* ccdf has to be big enough for a link-incident record */
u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
} __packed;
struct chsc_sei_nt2_area {
u8 flags; /* p and v bit */
u8 reserved1;
u8 reserved2;
u8 cc; /* content code */
u32 reserved3[13];
u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
} __packed;
#define CHSC_SEI_NT0 (1ULL << 63)
#define CHSC_SEI_NT2 (1ULL << 61)
struct chsc_sei {
struct chsc_header request;
u32 reserved1;
u64 ntsm; /* notification type mask */
struct chsc_header response;
u32 :24;
u8 nt;
union {
struct chsc_sei_nt0_area nt0_area;
struct chsc_sei_nt2_area nt2_area;
u8 nt_area[PAGE_SIZE - 24];
} u;
} __packed __aligned(PAGE_SIZE);
/*
* Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
*/
#define LIR_IQ_CLASS_INFO 0
#define LIR_IQ_CLASS_DEGRADED 1
#define LIR_IQ_CLASS_NOT_OPERATIONAL 2
struct lir {
struct {
u32 null:1;
u32 reserved:3;
u32 class:2;
u32 reserved2:2;
} __packed iq;
u32 ic:8;
u32 reserved:16;
struct node_descriptor incident_node;
struct node_descriptor attached_node;
u8 reserved2[32];
} __packed;
#define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */
#define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
/* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
static char *store_ebcdic(char *dest, const char *src, unsigned long len,
char delim)
{
memcpy(dest, src, len);
EBCASC(dest, len);
if (delim)
dest[len++] = delim;
return dest + len;
}
static void chsc_link_from_sei(struct chp_link *link,
struct chsc_sei_nt0_area *sei_area)
{
if ((sei_area->vf & SEI_VF_FLA) != 0) {
link->fla = sei_area->fla;
link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
0xffff : 0xff00;
}
}
/* Format node ID and parameters for output in LIR log message. */
static void format_node_data(char *params, char *id, struct node_descriptor *nd)
{
memset(params, 0, PARAMS_LEN);
memset(id, 0, NODEID_LEN);
if (nd->validity != ND_VALIDITY_VALID) {
strncpy(params, "n/a", PARAMS_LEN - 1);
strncpy(id, "n/a", NODEID_LEN - 1);
return;
}
/* PARAMS=xx,xxxxxx */
snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params);
/* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
id = store_ebcdic(id, nd->type, sizeof(nd->type), '/');
id = store_ebcdic(id, nd->model, sizeof(nd->model), ',');
id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.');
id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0);
id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ',');
sprintf(id, "%04X", nd->tag);
}
static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
{
struct lir *lir = (struct lir *) &sei_area->ccdf;
char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
aunodeid[NODEID_LEN];
CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
/* Ignore NULL Link Incident Records. */
if (lir->iq.null)
return;
/* Inform user that a link requires maintenance actions because it has
* become degraded or not operational. Note that this log message is
* the primary intention behind a Link Incident Record. */
format_node_data(iuparams, iunodeid, &lir->incident_node);
format_node_data(auparams, aunodeid, &lir->attached_node);
switch (lir->iq.class) {
case LIR_IQ_CLASS_DEGRADED:
pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
"IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
sei_area->rs, sei_area->rsid, lir->ic, iuparams,
iunodeid, auparams, aunodeid);
break;
case LIR_IQ_CLASS_NOT_OPERATIONAL:
pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
"IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
sei_area->rs, sei_area->rsid, lir->ic, iuparams,
iunodeid, auparams, aunodeid);
break;
default:
break;
}
}
static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
{
struct channel_path *chp;
struct chp_link link;
struct chp_id chpid;
int status;
CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
"rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
if (sei_area->rs != 4)
return;
chp_id_init(&chpid);
chpid.id = sei_area->rsid;
/* allocate a new channel path structure, if needed */
status = chp_get_status(chpid);
if (!status)
return;
if (status < 0) {
chp_new(chpid);
} else {
chp = chpid_to_chp(chpid);
mutex_lock(&chp->lock);
chp_update_desc(chp);
mutex_unlock(&chp->lock);
}
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
chsc_link_from_sei(&link, sei_area);
s390_process_res_acc(&link);
}
static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
{
struct channel_path *chp;
struct chp_id chpid;
u8 *data;
int num;
CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
if (sei_area->rs != 0)
return;
data = sei_area->ccdf;
chp_id_init(&chpid);
for (num = 0; num <= __MAX_CHPID; num++) {
if (!chp_test_bit(data, num))
continue;
chpid.id = num;
CIO_CRW_EVENT(4, "Update information for channel path "
"%x.%02x\n", chpid.cssid, chpid.id);
chp = chpid_to_chp(chpid);
if (!chp) {
chp_new(chpid);
continue;
}
mutex_lock(&chp->lock);
chp_update_desc(chp);
mutex_unlock(&chp->lock);
}
}
struct chp_config_data {
u8 map[32];
u8 op;
u8 pc;
};
static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
{
struct chp_config_data *data;
struct chp_id chpid;
int num;
char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
if (sei_area->rs != 0)
return;
data = (struct chp_config_data *) &(sei_area->ccdf);
chp_id_init(&chpid);
for (num = 0; num <= __MAX_CHPID; num++) {
if (!chp_test_bit(data->map, num))
continue;
chpid.id = num;
pr_notice("Processing %s for channel path %x.%02x\n",
events[data->op], chpid.cssid, chpid.id);
switch (data->op) {
case 0:
chp_cfg_schedule(chpid, 1);
break;
case 1:
chp_cfg_schedule(chpid, 0);
break;
case 2:
chp_cfg_cancel_deconfigure(chpid);
break;
}
}
}
static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
{
int ret;
CIO_CRW_EVENT(4, "chsc: scm change notification\n");
if (sei_area->rs != 7)
return;
ret = scm_update_information();
if (ret)
CIO_CRW_EVENT(0, "chsc: updating change notification"
" failed (rc=%d).\n", ret);
}
static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
{
int ret;
CIO_CRW_EVENT(4, "chsc: scm available information\n");
if (sei_area->rs != 7)
return;
ret = scm_process_availability_information();
if (ret)
CIO_CRW_EVENT(0, "chsc: process availability information"
" failed (rc=%d).\n", ret);
}
static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
{
CIO_CRW_EVENT(3, "chsc: ap config changed\n");
if (sei_area->rs != 5)
return;
ap_bus_cfg_chg();
}
static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
{
struct chp_link link;
struct chp_id chpid;
struct channel_path *chp;
CIO_CRW_EVENT(4,
"chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
if (sei_area->rs != SEI_RS_CHPID)
return;
chp_id_init(&chpid);
chpid.id = sei_area->rsid;
/* Ignore the event on unknown/invalid chp */
chp = chpid_to_chp(chpid);
if (!chp)
return;
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
chsc_link_from_sei(&link, sei_area);
for_each_subchannel_staged(process_fces_event, NULL, &link);
}
static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
{
switch (sei_area->cc) {
case 1:
zpci_event_error(sei_area->ccdf);
break;
case 2:
zpci_event_availability(sei_area->ccdf);
break;
default:
CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
sei_area->cc);
break;
}
}
static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
{
/* which kind of information was stored? */
switch (sei_area->cc) {
case 1: /* link incident*/
chsc_process_sei_link_incident(sei_area);
break;
case 2: /* i/o resource accessibility */
chsc_process_sei_res_acc(sei_area);
break;
case 3: /* ap config changed */
chsc_process_sei_ap_cfg_chg(sei_area);
break;
case 7: /* channel-path-availability information */
chsc_process_sei_chp_avail(sei_area);
break;
case 8: /* channel-path-configuration notification */
chsc_process_sei_chp_config(sei_area);
break;
case 12: /* scm change notification */
chsc_process_sei_scm_change(sei_area);
break;
case 14: /* scm available notification */
chsc_process_sei_scm_avail(sei_area);
break;
case 15: /* FCES event notification */
chsc_process_sei_fces_event(sei_area);
break;
default: /* other stuff */
CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
sei_area->cc);
break;
}
/* Check if we might have lost some information. */
if (sei_area->flags & 0x40) {
CIO_CRW_EVENT(2, "chsc: event overflow\n");
css_schedule_eval_all();
}
}
static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
{
static int ntsm_unsupported;
while (true) {
memset(sei, 0, sizeof(*sei));
sei->request.length = 0x0010;
sei->request.code = 0x000e;
if (!ntsm_unsupported)
sei->ntsm = ntsm;
if (chsc(sei))
break;
if (sei->response.code != 0x0001) {
CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
sei->response.code, sei->ntsm);
if (sei->response.code == 3 && sei->ntsm) {
/* Fallback for old firmware. */
ntsm_unsupported = 1;
continue;
}
break;
}
CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
switch (sei->nt) {
case 0:
chsc_process_sei_nt0(&sei->u.nt0_area);
break;
case 2:
chsc_process_sei_nt2(&sei->u.nt2_area);
break;
default:
CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
break;
}
if (!(sei->u.nt0_area.flags & 0x80))
break;
}
}
/*
* Handle channel subsystem related CRWs.
* Use store event information to find out what's going on.
*
* Note: Access to sei_page is serialized through machine check handler
* thread, so no need for locking.
*/
static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
{
struct chsc_sei *sei = sei_page;
if (overflow) {
css_schedule_eval_all();
return;
}
CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
crw0->erc, crw0->rsid);
CIO_TRACE_EVENT(2, "prcss");
chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
}
void chsc_chp_online(struct chp_id chpid)
{
struct channel_path *chp = chpid_to_chp(chpid);
struct chp_link link;
char dbf_txt[15];
sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
CIO_TRACE_EVENT(2, dbf_txt);
if (chp_get_status(chpid) != 0) {
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
mutex_lock(&chp->lock);
chp_update_desc(chp);
mutex_unlock(&chp->lock);
for_each_subchannel_staged(__s390_process_res_acc, NULL,
&link);
css_schedule_reprobe();
}
}
static void __s390_subchannel_vary_chpid(struct subchannel *sch,
struct chp_id chpid, int on)
{
unsigned long flags;
struct chp_link link;
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
spin_lock_irqsave(sch->lock, flags);
if (sch->driver && sch->driver->chp_event)
sch->driver->chp_event(sch, &link,
on ? CHP_VARY_ON : CHP_VARY_OFF);
spin_unlock_irqrestore(sch->lock, flags);
}
static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
{
struct chp_id *chpid = data;
__s390_subchannel_vary_chpid(sch, *chpid, 0);
return 0;
}
static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
{
struct chp_id *chpid = data;
__s390_subchannel_vary_chpid(sch, *chpid, 1);
return 0;
}
/**
* chsc_chp_vary - propagate channel-path vary operation to subchannels
* @chpid: channl-path ID
* @on: non-zero for vary online, zero for vary offline
*/
int chsc_chp_vary(struct chp_id chpid, int on)
{
struct channel_path *chp = chpid_to_chp(chpid);
/*
* Redo PathVerification on the devices the chpid connects to
*/
if (on) {
/* Try to update the channel path description. */
chp_update_desc(chp);
for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
NULL, &chpid);
css_schedule_reprobe();
} else
for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
NULL, &chpid);
return 0;
}
static void
chsc_remove_cmg_attr(struct channel_subsystem *css)
{
int i;
for (i = 0; i <= __MAX_CHPID; i++) {
if (!css->chps[i])
continue;
chp_remove_cmg_attr(css->chps[i]);
}
}
static int
chsc_add_cmg_attr(struct channel_subsystem *css)
{
int i, ret;
ret = 0;
for (i = 0; i <= __MAX_CHPID; i++) {
if (!css->chps[i])
continue;
ret = chp_add_cmg_attr(css->chps[i]);
if (ret)
goto cleanup;
}
return ret;
cleanup:
for (--i; i >= 0; i--) {
if (!css->chps[i])
continue;
chp_remove_cmg_attr(css->chps[i]);
}
return ret;
}
int __chsc_do_secm(struct channel_subsystem *css, int enable)
{
struct {
struct chsc_header request;
u32 operation_code : 2;
u32 : 30;
u32 key : 4;
u32 : 28;
u32 zeroes1;
u32 cub_addr1;
u32 zeroes2;
u32 cub_addr2;
u32 reserved[13];
struct chsc_header response;
u32 status : 8;
u32 : 4;
u32 fmt : 4;
u32 : 16;
} *secm_area;
unsigned long flags;
int ret, ccode;
spin_lock_irqsave(&chsc_page_lock, flags);
memset(chsc_page, 0, PAGE_SIZE);
secm_area = chsc_page;
secm_area->request.length = 0x0050;
secm_area->request.code = 0x0016;
secm_area->key = PAGE_DEFAULT_KEY >> 4;
secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
secm_area->operation_code = enable ? 0 : 1;
ccode = chsc(secm_area);
if (ccode > 0) {
ret = (ccode == 3) ? -ENODEV : -EBUSY;
goto out;
}
switch (secm_area->response.code) {
case 0x0102:
case 0x0103:
ret = -EINVAL;
break;
default:
ret = chsc_error_from_response(secm_area->response.code);
}
if (ret != 0)
CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
secm_area->response.code);
out:
spin_unlock_irqrestore(&chsc_page_lock, flags);
return ret;
}
int
chsc_secm(struct channel_subsystem *css, int enable)
{
int ret;
if (enable && !css->cm_enabled) {
css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!css->cub_addr1 || !css->cub_addr2) {
free_page((unsigned long)css->cub_addr1);
free_page((unsigned long)css->cub_addr2);
return -ENOMEM;
}
}
ret = __chsc_do_secm(css, enable);
if (!ret) {
css->cm_enabled = enable;
if (css->cm_enabled) {
ret = chsc_add_cmg_attr(css);
if (ret) {
__chsc_do_secm(css, 0);
css->cm_enabled = 0;
}
} else
chsc_remove_cmg_attr(css);
}
if (!css->cm_enabled) {
free_page((unsigned long)css->cub_addr1);
free_page((unsigned long)css->cub_addr2);
}
return ret;
}
int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
int c, int m, void *page)
{
struct chsc_scpd *scpd_area;
int ccode, ret;
if ((rfmt == 1 || rfmt == 0) && c == 1 &&
!css_general_characteristics.fcs)
return -EINVAL;
if ((rfmt == 2) && !css_general_characteristics.cib)
return -EINVAL;
if ((rfmt == 3) && !css_general_characteristics.util_str)
return -EINVAL;
memset(page, 0, PAGE_SIZE);
scpd_area = page;
scpd_area->request.length = 0x0010;
scpd_area->request.code = 0x0002;
scpd_area->cssid = chpid.cssid;
scpd_area->first_chpid = chpid.id;
scpd_area->last_chpid = chpid.id;
scpd_area->m = m;
scpd_area->c = c;
scpd_area->fmt = fmt;
scpd_area->rfmt = rfmt;
ccode = chsc(scpd_area);
if (ccode > 0)
return (ccode == 3) ? -ENODEV : -EBUSY;
ret = chsc_error_from_response(scpd_area->response.code);
if (ret)
CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
scpd_area->response.code);
return ret;
}
EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
#define chsc_det_chp_desc(FMT, c) \
int chsc_determine_fmt##FMT##_channel_path_desc( \
struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \
{ \
struct chsc_scpd *scpd_area; \
unsigned long flags; \
int ret; \
\
spin_lock_irqsave(&chsc_page_lock, flags); \
scpd_area = chsc_page; \
ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \
scpd_area); \
if (ret) \
goto out; \
\
memcpy(desc, scpd_area->data, sizeof(*desc)); \
out: \
spin_unlock_irqrestore(&chsc_page_lock, flags); \
return ret; \
}
chsc_det_chp_desc(0, 0)
chsc_det_chp_desc(1, 1)
chsc_det_chp_desc(3, 0)
static void
chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
struct cmg_chars *chars)
{
int i, mask;
for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
mask = 0x80 >> (i + 3);
if (cmcv & mask)
chp->cmg_chars.values[i] = chars->values[i];
else
chp->cmg_chars.values[i] = 0;
}
}
int chsc_get_channel_measurement_chars(struct channel_path *chp)
{
unsigned long flags;
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;
u32 not_valid : 1;
u32 shared : 1;
u32 : 22;
u32 chpid : 8;
u32 cmcv : 5;
u32 : 11;
u32 cmgq : 8;
u32 cmg : 8;
u32 zeroes3;
u32 data[NR_MEASUREMENT_CHARS];
} *scmc_area;
chp->shared = -1;
chp->cmg = -1;
if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
return -EINVAL;
spin_lock_irqsave(&chsc_page_lock, flags);
memset(chsc_page, 0, PAGE_SIZE);
scmc_area = chsc_page;
scmc_area->request.length = 0x0010;
scmc_area->request.code = 0x0022;
scmc_area->first_chpid = chp->chpid.id;
scmc_area->last_chpid = chp->chpid.id;
ccode = chsc(scmc_area);
if (ccode > 0) {
ret = (ccode == 3) ? -ENODEV : -EBUSY;
goto out;
}
ret = chsc_error_from_response(scmc_area->response.code);
if (ret) {
CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
scmc_area->response.code);
goto out;
}
if (scmc_area->not_valid)
goto out;
chp->cmg = scmc_area->cmg;
chp->shared = scmc_area->shared;
if (chp->cmg != 2 && chp->cmg != 3) {
/* No cmg-dependent data. */
goto out;
}
chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
(struct cmg_chars *) &scmc_area->data);
out:
spin_unlock_irqrestore(&chsc_page_lock, flags);
return ret;
}
int __init chsc_init(void)
{
int ret;
sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!sei_page || !chsc_page) {
ret = -ENOMEM;
goto out_err;
}
ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
if (ret)
goto out_err;
return ret;
out_err:
free_page((unsigned long)chsc_page);
free_page((unsigned long)sei_page);
return ret;
}
void __init chsc_init_cleanup(void)
{
crw_unregister_handler(CRW_RSC_CSS);
free_page((unsigned long)chsc_page);
free_page((unsigned long)sei_page);
}
int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
{
int ret;
sda_area->request.length = 0x0400;
sda_area->request.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 0x0101:
ret = -EOPNOTSUPP;
break;
default:
ret = chsc_error_from_response(sda_area->response.code);
}
out:
return ret;
}
int chsc_enable_facility(int operation_code)
{
struct chsc_sda_area *sda_area;
unsigned long flags;
int ret;
spin_lock_irqsave(&chsc_page_lock, flags);
memset(chsc_page, 0, PAGE_SIZE);
sda_area = chsc_page;
ret = __chsc_enable_facility(sda_area, operation_code);
if (ret != 0)
CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
operation_code, sda_area->response.code);
spin_unlock_irqrestore(&chsc_page_lock, flags);
return ret;
}
int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
{
struct {
struct chsc_header request;
u8 atype;
u32 : 24;
u32 reserved1[6];
struct chsc_header response;
u32 reserved2[3];
struct {
u8 cssid;
u8 iid;
u32 : 16;
} list[];
} *sdcal_area;
int ret;
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
sdcal_area = chsc_page;
sdcal_area->request.length = 0x0020;
sdcal_area->request.code = 0x0034;
sdcal_area->atype = 4;
ret = chsc(sdcal_area);
if (ret) {
ret = (ret == 3) ? -ENODEV : -EBUSY;
goto exit;
}
ret = chsc_error_from_response(sdcal_area->response.code);
if (ret) {
CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
sdcal_area->response.code);
goto exit;
}
if ((addr_t) &sdcal_area->list[idx] <
(addr_t) &sdcal_area->response + sdcal_area->response.length) {
*cssid = sdcal_area->list[idx].cssid;
*iid = sdcal_area->list[idx].iid;
}
else
ret = -ENODEV;
exit:
spin_unlock_irq(&chsc_page_lock);
return ret;
}
struct css_general_char css_general_characteristics;
struct css_chsc_char css_chsc_characteristics;
int __init
chsc_determine_css_characteristics(void)
{
unsigned long flags;
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[508];
} *scsc_area;
spin_lock_irqsave(&chsc_page_lock, flags);
memset(chsc_page, 0, PAGE_SIZE);
scsc_area = chsc_page;
scsc_area->request.length = 0x0010;
scsc_area->request.code = 0x0010;
result = chsc(scsc_area);
if (result) {
result = (result == 3) ? -ENODEV : -EBUSY;
goto exit;
}
result = chsc_error_from_response(scsc_area->response.code);
if (result == 0) {
memcpy(&css_general_characteristics, scsc_area->general_char,
sizeof(css_general_characteristics));
memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
sizeof(css_chsc_characteristics));
} else
CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
scsc_area->response.code);
exit:
spin_unlock_irqrestore(&chsc_page_lock, flags);
return result;
}
EXPORT_SYMBOL_GPL(css_general_characteristics);
EXPORT_SYMBOL_GPL(css_chsc_characteristics);
int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta)
{
struct {
struct chsc_header request;
unsigned int rsvd0;
unsigned int op : 8;
unsigned int rsvd1 : 8;
unsigned int ctrl : 16;
unsigned int rsvd2[5];
struct chsc_header response;
unsigned int rsvd3[3];
s64 clock_delta;
unsigned int rsvd4[2];
} *rr;
int rc;
memset(page, 0, PAGE_SIZE);
rr = page;
rr->request.length = 0x0020;
rr->request.code = 0x0033;
rr->op = op;
rr->ctrl = ctrl;
rc = chsc(rr);
if (rc)
return -EIO;
rc = (rr->response.code == 0x0001) ? 0 : -EIO;
if (clock_delta)
*clock_delta = rr->clock_delta;
return rc;
}
int chsc_sstpi(void *page, void *result, size_t size)
{
struct {
struct chsc_header request;
unsigned int rsvd0[3];
struct chsc_header response;
char data[];
} *rr;
int rc;
memset(page, 0, PAGE_SIZE);
rr = page;
rr->request.length = 0x0010;
rr->request.code = 0x0038;
rc = chsc(rr);
if (rc)
return -EIO;
memcpy(result, &rr->data, size);
return (rr->response.code == 0x0001) ? 0 : -EIO;
}
int chsc_stzi(void *page, void *result, size_t size)
{
struct {
struct chsc_header request;
unsigned int rsvd0[3];
struct chsc_header response;
char data[];
} *rr;
int rc;
memset(page, 0, PAGE_SIZE);
rr = page;
rr->request.length = 0x0010;
rr->request.code = 0x003e;
rc = chsc(rr);
if (rc)
return -EIO;
memcpy(result, &rr->data, size);
return (rr->response.code == 0x0001) ? 0 : -EIO;
}
int chsc_siosl(struct subchannel_id schid)
{
struct {
struct chsc_header request;
u32 word1;
struct subchannel_id sid;
u32 word3;
struct chsc_header response;
u32 word[11];
} *siosl_area;
unsigned long flags;
int ccode;
int rc;
spin_lock_irqsave(&chsc_page_lock, flags);
memset(chsc_page, 0, PAGE_SIZE);
siosl_area = chsc_page;
siosl_area->request.length = 0x0010;
siosl_area->request.code = 0x0046;
siosl_area->word1 = 0x80000000;
siosl_area->sid = schid;
ccode = chsc(siosl_area);
if (ccode > 0) {
if (ccode == 3)
rc = -ENODEV;
else
rc = -EBUSY;
CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
schid.ssid, schid.sch_no, ccode);
goto out;
}
rc = chsc_error_from_response(siosl_area->response.code);
if (rc)
CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
schid.ssid, schid.sch_no,
siosl_area->response.code);
else
CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
schid.ssid, schid.sch_no);
out:
spin_unlock_irqrestore(&chsc_page_lock, flags);
return rc;
}
EXPORT_SYMBOL_GPL(chsc_siosl);
/**
* chsc_scm_info() - store SCM information (SSI)
* @scm_area: request and response block for SSI
* @token: continuation token
*
* Returns 0 on success.
*/
int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
{
int ccode, ret;
memset(scm_area, 0, sizeof(*scm_area));
scm_area->request.length = 0x0020;
scm_area->request.code = 0x004C;
scm_area->reqtok = token;
ccode = chsc(scm_area);
if (ccode > 0) {
ret = (ccode == 3) ? -ENODEV : -EBUSY;
goto out;
}
ret = chsc_error_from_response(scm_area->response.code);
if (ret != 0)
CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
scm_area->response.code);
out:
return ret;
}
EXPORT_SYMBOL_GPL(chsc_scm_info);
/**
* chsc_pnso() - Perform Network-Subchannel Operation
* @schid: id of the subchannel on which PNSO is performed
* @pnso_area: request and response block for the operation
* @oc: Operation Code
* @resume_token: resume token for multiblock response
* @cnc: Boolean change-notification control
*
* pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
*
* Returns 0 on success.
*/
int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
{
memset(pnso_area, 0, sizeof(*pnso_area));
pnso_area->request.length = 0x0030;
pnso_area->request.code = 0x003d; /* network-subchannel operation */
pnso_area->m = schid.m;
pnso_area->ssid = schid.ssid;
pnso_area->sch = schid.sch_no;
pnso_area->cssid = schid.cssid;
pnso_area->oc = oc;
pnso_area->resume_token = resume_token;
pnso_area->n = (cnc != 0);
if (chsc(pnso_area))
return -EIO;
return chsc_error_from_response(pnso_area->response.code);
}
int chsc_sgib(u32 origin)
{
struct {
struct chsc_header request;
u16 op;
u8 reserved01[2];
u8 reserved02:4;
u8 fmt:4;
u8 reserved03[7];
/* operation data area begin */
u8 reserved04[4];
u32 gib_origin;
u8 reserved05[10];
u8 aix;
u8 reserved06[4029];
struct chsc_header response;
u8 reserved07[4];
} *sgib_area;
int ret;
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
sgib_area = chsc_page;
sgib_area->request.length = 0x0fe0;
sgib_area->request.code = 0x0021;
sgib_area->op = 0x1;
sgib_area->gib_origin = origin;
ret = chsc(sgib_area);
if (ret == 0)
ret = chsc_error_from_response(sgib_area->response.code);
spin_unlock_irq(&chsc_page_lock);
return ret;
}
EXPORT_SYMBOL_GPL(chsc_sgib);
#define SCUD_REQ_LEN 0x10 /* SCUD request block length */
#define SCUD_REQ_CMD 0x4b /* SCUD Command Code */
struct chse_cudb {
u16 flags:8;
u16 chp_valid:8;
u16 cu;
u32 esm_valid:8;
u32:24;
u8 chpid[8];
u32:32;
u32:32;
u8 esm[8];
u32 efla[8];
} __packed;
struct chsc_scud {
struct chsc_header request;
u16:4;
u16 fmt:4;
u16 cssid:8;
u16 first_cu;
u16:16;
u16 last_cu;
u32:32;
struct chsc_header response;
u16:4;
u16 fmt_resp:4;
u32:24;
struct chse_cudb cudb[];
} __packed;
/**
* chsc_scud() - Store control-unit description.
* @cu: number of the control-unit
* @esm: 8 1-byte endpoint security mode values
* @esm_valid: validity mask for @esm
*
* Interface to retrieve information about the endpoint security
* modes for up to 8 paths of a control unit.
*
* Returns 0 on success.
*/
int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
{
struct chsc_scud *scud = chsc_page;
int ret;
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
scud->request.length = SCUD_REQ_LEN;
scud->request.code = SCUD_REQ_CMD;
scud->fmt = 0;
scud->cssid = 0;
scud->first_cu = cu;
scud->last_cu = cu;
ret = chsc(scud);
if (!ret)
ret = chsc_error_from_response(scud->response.code);
if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
|| !(scud->cudb[0].flags & 0x80)
|| scud->cudb[0].cu != cu)) {
CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
"FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
scud->response.code, scud->response.length,
scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
ret = -EINVAL;
}
if (ret)
goto out;
memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
*esm_valid = scud->cudb[0].esm_valid;
out:
spin_unlock_irq(&chsc_page_lock);
return ret;
}
EXPORT_SYMBOL_GPL(chsc_scud);