/*
* drivers/s390/cio/chsc.c
* S/390 common I/O routines -- channel subsystem call
*
* Copyright IBM Corp. 1999,2008
* 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 <asm/cio.h>
#include <asm/chpid.h>
#include <asm/chsc.h>
#include <asm/crw.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 DEFINE_SPINLOCK(sda_lock);
/**
* 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:
return -EINVAL;
case 0x0004:
return -EOPNOTSUPP;
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 */
} __attribute__ ((packed));
int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
{
unsigned long page;
struct chsc_ssd_area *ssd_area;
int ccode;
int ret;
int i;
int mask;
page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!page)
return -ENOMEM;
ssd_area = (struct chsc_ssd_area *) 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_free;
}
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_free;
}
if (!ssd_area->sch_valid) {
ret = -ENODEV;
goto out_free;
}
/* 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_free;
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_free:
free_page(page);
return ret;
}
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)
{
char dbf_txt[15];
struct chp_link link;
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();
for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
}
static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
{
struct schib schib;
/*
* 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 -ENXIO;
/* Put it on the slow path. */
css_schedule_eval(schid);
return 0;
}
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,
s390_process_res_acc_new_sch, link);
}
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];
} __attribute__ ((packed)) *lir;
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);
}
struct chsc_sei_area {
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;
u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */
/* ccdf has to be big enough for a link-incident record */
} __attribute__ ((packed));
static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
{
struct chp_id chpid;
int id;
CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
sei_area->rs, sei_area->rsid);
if (sei_area->rs != 4)
return;
id = __get_chpid_from_lir(sei_area->ccdf);
if (id < 0)
CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
else {
chp_id_init(&chpid);
chpid.id = id;
chsc_chp_offline(chpid);
}
}
static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
{
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 < 0)
chp_new(chpid);
else if (!status)
return;
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
if ((sei_area->vf & 0xc0) != 0) {
link.fla = sei_area->fla;
if ((sei_area->vf & 0xc0) == 0xc0)
/* full link address */
link.fla_mask = 0xffff;
else
/* link address */
link.fla_mask = 0xff00;
}
s390_process_res_acc(&link);
}
struct chp_config_data {
u8 map[32];
u8 op;
u8 pc;
};
static void chsc_process_sei_chp_config(struct chsc_sei_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(struct chsc_sei_area *sei_area)
{
/* 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();
}
/* 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 accessibiliy */
chsc_process_sei_res_acc(sei_area);
break;
case 8: /* channel-path-configuration notification */
chsc_process_sei_chp_config(sei_area);
break;
default: /* other stuff */
CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
sei_area->cc);
break;
}
}
static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
{
struct chsc_sei_area *sei_area;
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);
if (!sei_page)
return;
/* Access to sei_page is serialized through machine check handler
* thread, so no need for locking. */
sei_area = sei_page;
CIO_TRACE_EVENT(2, "prcss");
do {
memset(sei_area, 0, sizeof(*sei_area));
sei_area->request.length = 0x0010;
sei_area->request.code = 0x000e;
if (chsc(sei_area))
break;
if (sei_area->response.code == 0x0001) {
CIO_CRW_EVENT(4, "chsc: sei successful\n");
chsc_process_sei(sei_area);
} else {
CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
sei_area->response.code);
break;
}
} while (sei_area->flags & 0x80);
}
void chsc_chp_online(struct chp_id chpid)
{
char dbf_txt[15];
struct chp_link link;
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();
for_each_subchannel_staged(__s390_process_res_acc, NULL,
&link);
}
}
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;
}
static int
__s390_vary_chpid_on(struct subchannel_id schid, void *data)
{
struct schib schib;
if (stsch_err(schid, &schib))
/* We're through */
return -ENXIO;
/* Put it on the slow path. */
css_schedule_eval(schid);
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 chp_link link;
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
/*
* Redo PathVerification on the devices the chpid connects to
*/
if (on)
for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
__s390_vary_chpid_on, &link);
else
for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
NULL, &link);
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, void *page)
{
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;
} __attribute__ ((packed)) *secm_area;
int ret, ccode;
secm_area = 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)
return (ccode == 3) ? -ENODEV : -EBUSY;
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);
return ret;
}
int
chsc_secm(struct channel_subsystem *css, int enable)
{
void *secm_area;
int ret;
secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!secm_area)
return -ENOMEM;
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);
free_page((unsigned long)secm_area);
return -ENOMEM;
}
}
ret = __chsc_do_secm(css, enable, secm_area);
if (!ret) {
css->cm_enabled = enable;
if (css->cm_enabled) {
ret = chsc_add_cmg_attr(css);
if (ret) {
memset(secm_area, 0, PAGE_SIZE);
__chsc_do_secm(css, 0, secm_area);
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);
}
free_page((unsigned long)secm_area);
return ret;
}
int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
int c, int m,
struct chsc_response_struct *resp)
{
int ccode, ret;
struct {
struct chsc_header request;
u32 : 2;
u32 m : 1;
u32 c : 1;
u32 fmt : 4;
u32 cssid : 8;
u32 : 4;
u32 rfmt : 4;
u32 first_chpid : 8;
u32 : 24;
u32 last_chpid : 8;
u32 zeroes1;
struct chsc_header response;
u8 data[PAGE_SIZE - 20];
} __attribute__ ((packed)) *scpd_area;
if ((rfmt == 1) && !css_general_characteristics.fcs)
return -EINVAL;
if ((rfmt == 2) && !css_general_characteristics.cib)
return -EINVAL;
scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!scpd_area)
return -ENOMEM;
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) {
ret = (ccode == 3) ? -ENODEV : -EBUSY;
goto out;
}
ret = chsc_error_from_response(scpd_area->response.code);
if (ret == 0)
/* Success. */
memcpy(resp, &scpd_area->response, scpd_area->response.length);
else
CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
scpd_area->response.code);
out:
free_page((unsigned long)scpd_area);
return ret;
}
EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
int chsc_determine_base_channel_path_desc(struct chp_id chpid,
struct channel_path_desc *desc)
{
struct chsc_response_struct *chsc_resp;
int ret;
chsc_resp = kzalloc(sizeof(*chsc_resp), GFP_KERNEL);
if (!chsc_resp)
return -ENOMEM;
ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp);
if (ret)
goto out_free;
memcpy(desc, &chsc_resp->data, chsc_resp->length);
out_free:
kfree(chsc_resp);
return ret;
}
static void
chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
struct cmg_chars *chars)
{
switch (chp->cmg) {
case 2:
case 3:
chp->cmg_chars = kmalloc(sizeof(struct cmg_chars),
GFP_KERNEL);
if (chp->cmg_chars) {
int i, mask;
struct cmg_chars *cmg_chars;
cmg_chars = chp->cmg_chars;
for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
mask = 0x80 >> (i + 3);
if (cmcv & mask)
cmg_chars->values[i] = chars->values[i];
else
cmg_chars->values[i] = 0;
}
}
break;
default:
/* No cmg-dependent data. */
break;
}
}
int chsc_get_channel_measurement_chars(struct channel_path *chp)
{
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];
} __attribute__ ((packed)) *scmc_area;
scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!scmc_area)
return -ENOMEM;
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 == 0) {
/* Success. */
if (!scmc_area->not_valid) {
chp->cmg = scmc_area->cmg;
chp->shared = scmc_area->shared;
chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
(struct cmg_chars *)
&scmc_area->data);
} else {
chp->cmg = -1;
chp->shared = -1;
}
} else {
CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
scmc_area->response.code);
}
out:
free_page((unsigned long)scmc_area);
return ret;
}
int __init chsc_alloc_sei_area(void)
{
int ret;
sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!sei_page) {
CIO_MSG_EVENT(0, "Can't allocate page for processing of "
"chsc machine checks!\n");
return -ENOMEM;
}
ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
if (ret)
kfree(sei_page);
return ret;
}
void __init chsc_free_sei_area(void)
{
crw_unregister_handler(CRW_RSC_CSS);
kfree(sei_page);
}
int chsc_enable_facility(int operation_code)
{
int ret;
static 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;
} __attribute__ ((packed, aligned(4096))) sda_area;
spin_lock(&sda_lock);
memset(&sda_area, 0, sizeof(sda_area));
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);
}
if (ret != 0)
CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
operation_code, sda_area.response.code);
out:
spin_unlock(&sda_lock);
return ret;
}
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];
} __attribute__ ((packed)) *scsc_area;
scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!scsc_area)
return -ENOMEM;
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:
free_page ((unsigned long) scsc_area);
return result;
}
EXPORT_SYMBOL_GPL(css_general_characteristics);
EXPORT_SYMBOL_GPL(css_chsc_characteristics);
int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
{
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[7];
} __attribute__ ((packed)) *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;
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[size];
} __attribute__ ((packed)) *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;
}
