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qemu-e2k/hw/s390x/css.c
Cornelia Huck 91b0a8f334 s390: Fix handling of iscs. 
There are two ways to express an interruption subclass:
- As a bitmask, as used in cr6.
- As a number, as used in the I/O interruption word.

Unfortunately, we have treated to I/O interruption word as if it
contained the bitmask as well, which went unnoticed so far as
- (queued-for-next) kvm made the same mistake, and
- Linux guest kernels don't check the isc value in the I/O interruption
  word for subchannel interrupts.

Make sure that we treat the I/O interruption word correctly.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-02-13 11:56:02 -06:00

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/*
* Channel subsystem base support.
*
* Copyright 2012 IBM Corp.
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include <hw/qdev.h>
#include "qemu/bitops.h"
#include "cpu.h"
#include "ioinst.h"
#include "css.h"
#include "trace.h"
typedef struct CrwContainer {
CRW crw;
QTAILQ_ENTRY(CrwContainer) sibling;
} CrwContainer;
typedef struct ChpInfo {
uint8_t in_use;
uint8_t type;
uint8_t is_virtual;
} ChpInfo;
typedef struct SubchSet {
SubchDev *sch[MAX_SCHID + 1];
unsigned long schids_used[BITS_TO_LONGS(MAX_SCHID + 1)];
unsigned long devnos_used[BITS_TO_LONGS(MAX_SCHID + 1)];
} SubchSet;
typedef struct CssImage {
SubchSet *sch_set[MAX_SSID + 1];
ChpInfo chpids[MAX_CHPID + 1];
} CssImage;
typedef struct ChannelSubSys {
QTAILQ_HEAD(, CrwContainer) pending_crws;
bool do_crw_mchk;
bool crws_lost;
uint8_t max_cssid;
uint8_t max_ssid;
bool chnmon_active;
uint64_t chnmon_area;
CssImage *css[MAX_CSSID + 1];
uint8_t default_cssid;
} ChannelSubSys;
static ChannelSubSys *channel_subsys;
int css_create_css_image(uint8_t cssid, bool default_image)
{
trace_css_new_image(cssid, default_image ? "(default)" : "");
if (cssid > MAX_CSSID) {
return -EINVAL;
}
if (channel_subsys->css[cssid]) {
return -EBUSY;
}
channel_subsys->css[cssid] = g_malloc0(sizeof(CssImage));
if (default_image) {
channel_subsys->default_cssid = cssid;
}
return 0;
}
static uint16_t css_build_subchannel_id(SubchDev *sch)
{
if (channel_subsys->max_cssid > 0) {
return (sch->cssid << 8) | (1 << 3) | (sch->ssid << 1) | 1;
}
return (sch->ssid << 1) | 1;
}
static void css_inject_io_interrupt(SubchDev *sch)
{
S390CPU *cpu = s390_cpu_addr2state(0);
uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11;
trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid,
sch->curr_status.pmcw.intparm, isc, "");
s390_io_interrupt(cpu,
css_build_subchannel_id(sch),
sch->schid,
sch->curr_status.pmcw.intparm,
isc << 27);
}
void css_conditional_io_interrupt(SubchDev *sch)
{
/*
* If the subchannel is not currently status pending, make it pending
* with alert status.
*/
if (!(sch->curr_status.scsw.ctrl & SCSW_STCTL_STATUS_PEND)) {
S390CPU *cpu = s390_cpu_addr2state(0);
uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11;
trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid,
sch->curr_status.pmcw.intparm, isc,
"(unsolicited)");
sch->curr_status.scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
sch->curr_status.scsw.ctrl |=
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
/* Inject an I/O interrupt. */
s390_io_interrupt(cpu,
css_build_subchannel_id(sch),
sch->schid,
sch->curr_status.pmcw.intparm,
isc << 27);
}
}
static void sch_handle_clear_func(SubchDev *sch)
{
PMCW *p = &sch->curr_status.pmcw;
SCSW *s = &sch->curr_status.scsw;
int path;
/* Path management: In our simple css, we always choose the only path. */
path = 0x80;
/* Reset values prior to 'issueing the clear signal'. */
p->lpum = 0;
p->pom = 0xff;
s->flags &= ~SCSW_FLAGS_MASK_PNO;
/* We always 'attempt to issue the clear signal', and we always succeed. */
sch->orb = NULL;
sch->channel_prog = 0x0;
sch->last_cmd_valid = false;
s->ctrl &= ~SCSW_ACTL_CLEAR_PEND;
s->ctrl |= SCSW_STCTL_STATUS_PEND;
s->dstat = 0;
s->cstat = 0;
p->lpum = path;
}
static void sch_handle_halt_func(SubchDev *sch)
{
PMCW *p = &sch->curr_status.pmcw;
SCSW *s = &sch->curr_status.scsw;
int path;
/* Path management: In our simple css, we always choose the only path. */
path = 0x80;
/* We always 'attempt to issue the halt signal', and we always succeed. */
sch->orb = NULL;
sch->channel_prog = 0x0;
sch->last_cmd_valid = false;
s->ctrl &= ~SCSW_ACTL_HALT_PEND;
s->ctrl |= SCSW_STCTL_STATUS_PEND;
if ((s->ctrl & (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) ||
!((s->ctrl & SCSW_ACTL_START_PEND) ||
(s->ctrl & SCSW_ACTL_SUSP))) {
s->dstat = SCSW_DSTAT_DEVICE_END;
}
s->cstat = 0;
p->lpum = path;
}
static void copy_sense_id_to_guest(SenseId *dest, SenseId *src)
{
int i;
dest->reserved = src->reserved;
dest->cu_type = cpu_to_be16(src->cu_type);
dest->cu_model = src->cu_model;
dest->dev_type = cpu_to_be16(src->dev_type);
dest->dev_model = src->dev_model;
dest->unused = src->unused;
for (i = 0; i < ARRAY_SIZE(dest->ciw); i++) {
dest->ciw[i].type = src->ciw[i].type;
dest->ciw[i].command = src->ciw[i].command;
dest->ciw[i].count = cpu_to_be16(src->ciw[i].count);
}
}
static CCW1 copy_ccw_from_guest(hwaddr addr)
{
CCW1 tmp;
CCW1 ret;
cpu_physical_memory_read(addr, &tmp, sizeof(tmp));
ret.cmd_code = tmp.cmd_code;
ret.flags = tmp.flags;
ret.count = be16_to_cpu(tmp.count);
ret.cda = be32_to_cpu(tmp.cda);
return ret;
}
static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
{
int ret;
bool check_len;
int len;
CCW1 ccw;
if (!ccw_addr) {
return -EIO;
}
ccw = copy_ccw_from_guest(ccw_addr);
/* Check for invalid command codes. */
if ((ccw.cmd_code & 0x0f) == 0) {
return -EINVAL;
}
if (((ccw.cmd_code & 0x0f) == CCW_CMD_TIC) &&
((ccw.cmd_code & 0xf0) != 0)) {
return -EINVAL;
}
if (ccw.flags & CCW_FLAG_SUSPEND) {
return -EINPROGRESS;
}
check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
/* Look at the command. */
switch (ccw.cmd_code) {
case CCW_CMD_NOOP:
/* Nothing to do. */
ret = 0;
break;
case CCW_CMD_BASIC_SENSE:
if (check_len) {
if (ccw.count != sizeof(sch->sense_data)) {
ret = -EINVAL;
break;
}
}
len = MIN(ccw.count, sizeof(sch->sense_data));
cpu_physical_memory_write(ccw.cda, sch->sense_data, len);
sch->curr_status.scsw.count = ccw.count - len;
memset(sch->sense_data, 0, sizeof(sch->sense_data));
ret = 0;
break;
case CCW_CMD_SENSE_ID:
{
SenseId sense_id;
copy_sense_id_to_guest(&sense_id, &sch->id);
/* Sense ID information is device specific. */
if (check_len) {
if (ccw.count != sizeof(sense_id)) {
ret = -EINVAL;
break;
}
}
len = MIN(ccw.count, sizeof(sense_id));
/*
* Only indicate 0xff in the first sense byte if we actually
* have enough place to store at least bytes 0-3.
*/
if (len >= 4) {
sense_id.reserved = 0xff;
} else {
sense_id.reserved = 0;
}
cpu_physical_memory_write(ccw.cda, &sense_id, len);
sch->curr_status.scsw.count = ccw.count - len;
ret = 0;
break;
}
case CCW_CMD_TIC:
if (sch->last_cmd_valid && (sch->last_cmd.cmd_code == CCW_CMD_TIC)) {
ret = -EINVAL;
break;
}
if (ccw.flags & (CCW_FLAG_CC | CCW_FLAG_DC)) {
ret = -EINVAL;
break;
}
sch->channel_prog = ccw.cda;
ret = -EAGAIN;
break;
default:
if (sch->ccw_cb) {
/* Handle device specific commands. */
ret = sch->ccw_cb(sch, ccw);
} else {
ret = -ENOSYS;
}
break;
}
sch->last_cmd = ccw;
sch->last_cmd_valid = true;
if (ret == 0) {
if (ccw.flags & CCW_FLAG_CC) {
sch->channel_prog += 8;
ret = -EAGAIN;
}
}
return ret;
}
static void sch_handle_start_func(SubchDev *sch)
{
PMCW *p = &sch->curr_status.pmcw;
SCSW *s = &sch->curr_status.scsw;
ORB *orb = sch->orb;
int path;
int ret;
/* Path management: In our simple css, we always choose the only path. */
path = 0x80;
if (!(s->ctrl & SCSW_ACTL_SUSP)) {
/* Look at the orb and try to execute the channel program. */
p->intparm = orb->intparm;
if (!(orb->lpm & path)) {
/* Generate a deferred cc 3 condition. */
s->flags |= SCSW_FLAGS_MASK_CC;
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
return;
}
} else {
s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND);
}
sch->last_cmd_valid = false;
do {
ret = css_interpret_ccw(sch, sch->channel_prog);
switch (ret) {
case -EAGAIN:
/* ccw chain, continue processing */
break;
case 0:
/* success */
s->ctrl &= ~SCSW_ACTL_START_PEND;
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_STATUS_PEND;
s->dstat = SCSW_DSTAT_CHANNEL_END | SCSW_DSTAT_DEVICE_END;
break;
case -ENOSYS:
/* unsupported command, generate unit check (command reject) */
s->ctrl &= ~SCSW_ACTL_START_PEND;
s->dstat = SCSW_DSTAT_UNIT_CHECK;
/* Set sense bit 0 in ecw0. */
sch->sense_data[0] = 0x80;
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
break;
case -EFAULT:
/* memory problem, generate channel data check */
s->ctrl &= ~SCSW_ACTL_START_PEND;
s->cstat = SCSW_CSTAT_DATA_CHECK;
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
break;
case -EBUSY:
/* subchannel busy, generate deferred cc 1 */
s->flags &= ~SCSW_FLAGS_MASK_CC;
s->flags |= (1 << 8);
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
break;
case -EINPROGRESS:
/* channel program has been suspended */
s->ctrl &= ~SCSW_ACTL_START_PEND;
s->ctrl |= SCSW_ACTL_SUSP;
break;
default:
/* error, generate channel program check */
s->ctrl &= ~SCSW_ACTL_START_PEND;
s->cstat = SCSW_CSTAT_PROG_CHECK;
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
break;
}
} while (ret == -EAGAIN);
}
/*
* On real machines, this would run asynchronously to the main vcpus.
* We might want to make some parts of the ssch handling (interpreting
* read/writes) asynchronous later on if we start supporting more than
* our current very simple devices.
*/
static void do_subchannel_work(SubchDev *sch)
{
SCSW *s = &sch->curr_status.scsw;
if (s->ctrl & SCSW_FCTL_CLEAR_FUNC) {
sch_handle_clear_func(sch);
} else if (s->ctrl & SCSW_FCTL_HALT_FUNC) {
sch_handle_halt_func(sch);
} else if (s->ctrl & SCSW_FCTL_START_FUNC) {
sch_handle_start_func(sch);
} else {
/* Cannot happen. */
return;
}
css_inject_io_interrupt(sch);
}
static void copy_pmcw_to_guest(PMCW *dest, const PMCW *src)
{
int i;
dest->intparm = cpu_to_be32(src->intparm);
dest->flags = cpu_to_be16(src->flags);
dest->devno = cpu_to_be16(src->devno);
dest->lpm = src->lpm;
dest->pnom = src->pnom;
dest->lpum = src->lpum;
dest->pim = src->pim;
dest->mbi = cpu_to_be16(src->mbi);
dest->pom = src->pom;
dest->pam = src->pam;
for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) {
dest->chpid[i] = src->chpid[i];
}
dest->chars = cpu_to_be32(src->chars);
}
static void copy_scsw_to_guest(SCSW *dest, const SCSW *src)
{
dest->flags = cpu_to_be16(src->flags);
dest->ctrl = cpu_to_be16(src->ctrl);
dest->cpa = cpu_to_be32(src->cpa);
dest->dstat = src->dstat;
dest->cstat = src->cstat;
dest->count = cpu_to_be16(src->count);
}
static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src)
{
int i;
copy_pmcw_to_guest(&dest->pmcw, &src->pmcw);
copy_scsw_to_guest(&dest->scsw, &src->scsw);
dest->mba = cpu_to_be64(src->mba);
for (i = 0; i < ARRAY_SIZE(dest->mda); i++) {
dest->mda[i] = src->mda[i];
}
}
int css_do_stsch(SubchDev *sch, SCHIB *schib)
{
/* Use current status. */
copy_schib_to_guest(schib, &sch->curr_status);
return 0;
}
static void copy_pmcw_from_guest(PMCW *dest, const PMCW *src)
{
int i;
dest->intparm = be32_to_cpu(src->intparm);
dest->flags = be16_to_cpu(src->flags);
dest->devno = be16_to_cpu(src->devno);
dest->lpm = src->lpm;
dest->pnom = src->pnom;
dest->lpum = src->lpum;
dest->pim = src->pim;
dest->mbi = be16_to_cpu(src->mbi);
dest->pom = src->pom;
dest->pam = src->pam;
for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) {
dest->chpid[i] = src->chpid[i];
}
dest->chars = be32_to_cpu(src->chars);
}
static void copy_scsw_from_guest(SCSW *dest, const SCSW *src)
{
dest->flags = be16_to_cpu(src->flags);
dest->ctrl = be16_to_cpu(src->ctrl);
dest->cpa = be32_to_cpu(src->cpa);
dest->dstat = src->dstat;
dest->cstat = src->cstat;
dest->count = be16_to_cpu(src->count);
}
static void copy_schib_from_guest(SCHIB *dest, const SCHIB *src)
{
int i;
copy_pmcw_from_guest(&dest->pmcw, &src->pmcw);
copy_scsw_from_guest(&dest->scsw, &src->scsw);
dest->mba = be64_to_cpu(src->mba);
for (i = 0; i < ARRAY_SIZE(dest->mda); i++) {
dest->mda[i] = src->mda[i];
}
}
int css_do_msch(SubchDev *sch, SCHIB *orig_schib)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
int ret;
SCHIB schib;
if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_DNV)) {
ret = 0;
goto out;
}
if (s->ctrl & SCSW_STCTL_STATUS_PEND) {
ret = -EINPROGRESS;
goto out;
}
if (s->ctrl &
(SCSW_FCTL_START_FUNC|SCSW_FCTL_HALT_FUNC|SCSW_FCTL_CLEAR_FUNC)) {
ret = -EBUSY;
goto out;
}
copy_schib_from_guest(&schib, orig_schib);
/* Only update the program-modifiable fields. */
p->intparm = schib.pmcw.intparm;
p->flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
PMCW_FLAGS_MASK_MP);
p->flags |= schib.pmcw.flags &
(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
PMCW_FLAGS_MASK_MP);
p->lpm = schib.pmcw.lpm;
p->mbi = schib.pmcw.mbi;
p->pom = schib.pmcw.pom;
p->chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE);
p->chars |= schib.pmcw.chars &
(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE);
sch->curr_status.mba = schib.mba;
ret = 0;
out:
return ret;
}
int css_do_xsch(SubchDev *sch)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
int ret;
if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
ret = -ENODEV;
goto out;
}
if (!(s->ctrl & SCSW_CTRL_MASK_FCTL) ||
((s->ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) ||
(!(s->ctrl &
(SCSW_ACTL_RESUME_PEND | SCSW_ACTL_START_PEND | SCSW_ACTL_SUSP))) ||
(s->ctrl & SCSW_ACTL_SUBCH_ACTIVE)) {
ret = -EINPROGRESS;
goto out;
}
if (s->ctrl & SCSW_CTRL_MASK_STCTL) {
ret = -EBUSY;
goto out;
}
/* Cancel the current operation. */
s->ctrl &= ~(SCSW_FCTL_START_FUNC |
SCSW_ACTL_RESUME_PEND |
SCSW_ACTL_START_PEND |
SCSW_ACTL_SUSP);
sch->channel_prog = 0x0;
sch->last_cmd_valid = false;
sch->orb = NULL;
s->dstat = 0;
s->cstat = 0;
ret = 0;
out:
return ret;
}
int css_do_csch(SubchDev *sch)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
int ret;
if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
ret = -ENODEV;
goto out;
}
/* Trigger the clear function. */
s->ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL);
s->ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_CLEAR_FUNC;
do_subchannel_work(sch);
ret = 0;
out:
return ret;
}
int css_do_hsch(SubchDev *sch)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
int ret;
if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
ret = -ENODEV;
goto out;
}
if (((s->ctrl & SCSW_CTRL_MASK_STCTL) == SCSW_STCTL_STATUS_PEND) ||
(s->ctrl & (SCSW_STCTL_PRIMARY |
SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT))) {
ret = -EINPROGRESS;
goto out;
}
if (s->ctrl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
ret = -EBUSY;
goto out;
}
/* Trigger the halt function. */
s->ctrl |= SCSW_FCTL_HALT_FUNC;
s->ctrl &= ~SCSW_FCTL_START_FUNC;
if (((s->ctrl & SCSW_CTRL_MASK_ACTL) ==
(SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) &&
((s->ctrl & SCSW_CTRL_MASK_STCTL) == SCSW_STCTL_INTERMEDIATE)) {
s->ctrl &= ~SCSW_STCTL_STATUS_PEND;
}
s->ctrl |= SCSW_ACTL_HALT_PEND;
do_subchannel_work(sch);
ret = 0;
out:
return ret;
}
static void css_update_chnmon(SubchDev *sch)
{
if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_MME)) {
/* Not active. */
return;
}
/* The counter is conveniently located at the beginning of the struct. */
if (sch->curr_status.pmcw.chars & PMCW_CHARS_MASK_MBFC) {
/* Format 1, per-subchannel area. */
uint32_t count;
count = ldl_phys(sch->curr_status.mba);
count++;
stl_phys(sch->curr_status.mba, count);
} else {
/* Format 0, global area. */
uint32_t offset;
uint16_t count;
offset = sch->curr_status.pmcw.mbi << 5;
count = lduw_phys(channel_subsys->chnmon_area + offset);
count++;
stw_phys(channel_subsys->chnmon_area + offset, count);
}
}
int css_do_ssch(SubchDev *sch, ORB *orb)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
int ret;
if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
ret = -ENODEV;
goto out;
}
if (s->ctrl & SCSW_STCTL_STATUS_PEND) {
ret = -EINPROGRESS;
goto out;
}
if (s->ctrl & (SCSW_FCTL_START_FUNC |
SCSW_FCTL_HALT_FUNC |
SCSW_FCTL_CLEAR_FUNC)) {
ret = -EBUSY;
goto out;
}
/* If monitoring is active, update counter. */
if (channel_subsys->chnmon_active) {
css_update_chnmon(sch);
}
sch->orb = orb;
sch->channel_prog = orb->cpa;
/* Trigger the start function. */
s->ctrl |= (SCSW_FCTL_START_FUNC | SCSW_ACTL_START_PEND);
s->flags &= ~SCSW_FLAGS_MASK_PNO;
do_subchannel_work(sch);
ret = 0;
out:
return ret;
}
static void copy_irb_to_guest(IRB *dest, const IRB *src)
{
int i;
copy_scsw_to_guest(&dest->scsw, &src->scsw);
for (i = 0; i < ARRAY_SIZE(dest->esw); i++) {
dest->esw[i] = cpu_to_be32(src->esw[i]);
}
for (i = 0; i < ARRAY_SIZE(dest->ecw); i++) {
dest->ecw[i] = cpu_to_be32(src->ecw[i]);
}
for (i = 0; i < ARRAY_SIZE(dest->emw); i++) {
dest->emw[i] = cpu_to_be32(src->emw[i]);
}
}
int css_do_tsch(SubchDev *sch, IRB *target_irb)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
uint16_t stctl;
uint16_t fctl;
uint16_t actl;
IRB irb;
int ret;
if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
ret = 3;
goto out;
}
stctl = s->ctrl & SCSW_CTRL_MASK_STCTL;
fctl = s->ctrl & SCSW_CTRL_MASK_FCTL;
actl = s->ctrl & SCSW_CTRL_MASK_ACTL;
/* Prepare the irb for the guest. */
memset(&irb, 0, sizeof(IRB));
/* Copy scsw from current status. */
memcpy(&irb.scsw, s, sizeof(SCSW));
if (stctl & SCSW_STCTL_STATUS_PEND) {
if (s->cstat & (SCSW_CSTAT_DATA_CHECK |
SCSW_CSTAT_CHN_CTRL_CHK |
SCSW_CSTAT_INTF_CTRL_CHK)) {
irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF;
irb.esw[0] = 0x04804000;
} else {
irb.esw[0] = 0x00800000;
}
/* If a unit check is pending, copy sense data. */
if ((s->dstat & SCSW_DSTAT_UNIT_CHECK) &&
(p->chars & PMCW_CHARS_MASK_CSENSE)) {
irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF | SCSW_FLAGS_MASK_ECTL;
memcpy(irb.ecw, sch->sense_data, sizeof(sch->sense_data));
irb.esw[1] = 0x02000000 | (sizeof(sch->sense_data) << 8);
}
}
/* Store the irb to the guest. */
copy_irb_to_guest(target_irb, &irb);
/* Clear conditions on subchannel, if applicable. */
if (stctl & SCSW_STCTL_STATUS_PEND) {
s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
if ((stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) ||
((fctl & SCSW_FCTL_HALT_FUNC) &&
(actl & SCSW_ACTL_SUSP))) {
s->ctrl &= ~SCSW_CTRL_MASK_FCTL;
}
if (stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) {
s->flags &= ~SCSW_FLAGS_MASK_PNO;
s->ctrl &= ~(SCSW_ACTL_RESUME_PEND |
SCSW_ACTL_START_PEND |
SCSW_ACTL_HALT_PEND |
SCSW_ACTL_CLEAR_PEND |
SCSW_ACTL_SUSP);
} else {
if ((actl & SCSW_ACTL_SUSP) &&
(fctl & SCSW_FCTL_START_FUNC)) {
s->flags &= ~SCSW_FLAGS_MASK_PNO;
if (fctl & SCSW_FCTL_HALT_FUNC) {
s->ctrl &= ~(SCSW_ACTL_RESUME_PEND |
SCSW_ACTL_START_PEND |
SCSW_ACTL_HALT_PEND |
SCSW_ACTL_CLEAR_PEND |
SCSW_ACTL_SUSP);
} else {
s->ctrl &= ~SCSW_ACTL_RESUME_PEND;
}
}
}
/* Clear pending sense data. */
if (p->chars & PMCW_CHARS_MASK_CSENSE) {
memset(sch->sense_data, 0 , sizeof(sch->sense_data));
}
}
ret = ((stctl & SCSW_STCTL_STATUS_PEND) == 0);
out:
return ret;
}
static void copy_crw_to_guest(CRW *dest, const CRW *src)
{
dest->flags = cpu_to_be16(src->flags);
dest->rsid = cpu_to_be16(src->rsid);
}
int css_do_stcrw(CRW *crw)
{
CrwContainer *crw_cont;
int ret;
crw_cont = QTAILQ_FIRST(&channel_subsys->pending_crws);
if (crw_cont) {
QTAILQ_REMOVE(&channel_subsys->pending_crws, crw_cont, sibling);
copy_crw_to_guest(crw, &crw_cont->crw);
g_free(crw_cont);
ret = 0;
} else {
/* List was empty, turn crw machine checks on again. */
memset(crw, 0, sizeof(*crw));
channel_subsys->do_crw_mchk = true;
ret = 1;
}
return ret;
}
int css_do_tpi(IOIntCode *int_code, int lowcore)
{
/* No pending interrupts for !KVM. */
return 0;
}
int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid,
int rfmt, void *buf)
{
int i, desc_size;
uint32_t words[8];
uint32_t chpid_type_word;
CssImage *css;
if (!m && !cssid) {
css = channel_subsys->css[channel_subsys->default_cssid];
} else {
css = channel_subsys->css[cssid];
}
if (!css) {
return 0;
}
desc_size = 0;
for (i = f_chpid; i <= l_chpid; i++) {
if (css->chpids[i].in_use) {
chpid_type_word = 0x80000000 | (css->chpids[i].type << 8) | i;
if (rfmt == 0) {
words[0] = cpu_to_be32(chpid_type_word);
words[1] = 0;
memcpy(buf + desc_size, words, 8);
desc_size += 8;
} else if (rfmt == 1) {
words[0] = cpu_to_be32(chpid_type_word);
words[1] = 0;
words[2] = 0;
words[3] = 0;
words[4] = 0;
words[5] = 0;
words[6] = 0;
words[7] = 0;
memcpy(buf + desc_size, words, 32);
desc_size += 32;
}
}
}
return desc_size;
}
void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo)
{
/* dct is currently ignored (not really meaningful for our devices) */
/* TODO: Don't ignore mbk. */
if (update && !channel_subsys->chnmon_active) {
/* Enable measuring. */
channel_subsys->chnmon_area = mbo;
channel_subsys->chnmon_active = true;
}
if (!update && channel_subsys->chnmon_active) {
/* Disable measuring. */
channel_subsys->chnmon_area = 0;
channel_subsys->chnmon_active = false;
}
}
int css_do_rsch(SubchDev *sch)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
int ret;
if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
ret = -ENODEV;
goto out;
}
if (s->ctrl & SCSW_STCTL_STATUS_PEND) {
ret = -EINPROGRESS;
goto out;
}
if (((s->ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) ||
(s->ctrl & SCSW_ACTL_RESUME_PEND) ||
(!(s->ctrl & SCSW_ACTL_SUSP))) {
ret = -EINVAL;
goto out;
}
/* If monitoring is active, update counter. */
if (channel_subsys->chnmon_active) {
css_update_chnmon(sch);
}
s->ctrl |= SCSW_ACTL_RESUME_PEND;
do_subchannel_work(sch);
ret = 0;
out:
return ret;
}
int css_do_rchp(uint8_t cssid, uint8_t chpid)
{
uint8_t real_cssid;
if (cssid > channel_subsys->max_cssid) {
return -EINVAL;
}
if (channel_subsys->max_cssid == 0) {
real_cssid = channel_subsys->default_cssid;
} else {
real_cssid = cssid;
}
if (!channel_subsys->css[real_cssid]) {
return -EINVAL;
}
if (!channel_subsys->css[real_cssid]->chpids[chpid].in_use) {
return -ENODEV;
}
if (!channel_subsys->css[real_cssid]->chpids[chpid].is_virtual) {
fprintf(stderr,
"rchp unsupported for non-virtual chpid %x.%02x!\n",
real_cssid, chpid);
return -ENODEV;
}
/* We don't really use a channel path, so we're done here. */
css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT,
channel_subsys->max_cssid > 0 ? 1 : 0, chpid);
if (channel_subsys->max_cssid > 0) {
css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 0, real_cssid << 8);
}
return 0;
}
bool css_schid_final(uint8_t cssid, uint8_t ssid, uint16_t schid)
{
SubchSet *set;
if (cssid > MAX_CSSID || ssid > MAX_SSID || !channel_subsys->css[cssid] ||
!channel_subsys->css[cssid]->sch_set[ssid]) {
return true;
}
set = channel_subsys->css[cssid]->sch_set[ssid];
return schid > find_last_bit(set->schids_used,
(MAX_SCHID + 1) / sizeof(unsigned long));
}
static int css_add_virtual_chpid(uint8_t cssid, uint8_t chpid, uint8_t type)
{
CssImage *css;
trace_css_chpid_add(cssid, chpid, type);
if (cssid > MAX_CSSID) {
return -EINVAL;
}
css = channel_subsys->css[cssid];
if (!css) {
return -EINVAL;
}
if (css->chpids[chpid].in_use) {
return -EEXIST;
}
css->chpids[chpid].in_use = 1;
css->chpids[chpid].type = type;
css->chpids[chpid].is_virtual = 1;
css_generate_chp_crws(cssid, chpid);
return 0;
}
void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type)
{
PMCW *p = &sch->curr_status.pmcw;
SCSW *s = &sch->curr_status.scsw;
int i;
CssImage *css = channel_subsys->css[sch->cssid];
assert(css != NULL);
memset(p, 0, sizeof(PMCW));
p->flags |= PMCW_FLAGS_MASK_DNV;
p->devno = sch->devno;
/* single path */
p->pim = 0x80;
p->pom = 0xff;
p->pam = 0x80;
p->chpid[0] = chpid;
if (!css->chpids[chpid].in_use) {
css_add_virtual_chpid(sch->cssid, chpid, type);
}
memset(s, 0, sizeof(SCSW));
sch->curr_status.mba = 0;
for (i = 0; i < ARRAY_SIZE(sch->curr_status.mda); i++) {
sch->curr_status.mda[i] = 0;
}
}
SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid, uint16_t schid)
{
uint8_t real_cssid;
real_cssid = (!m && (cssid == 0)) ? channel_subsys->default_cssid : cssid;
if (!channel_subsys->css[real_cssid]) {
return NULL;
}
if (!channel_subsys->css[real_cssid]->sch_set[ssid]) {
return NULL;
}
return channel_subsys->css[real_cssid]->sch_set[ssid]->sch[schid];
}
bool css_subch_visible(SubchDev *sch)
{
if (sch->ssid > channel_subsys->max_ssid) {
return false;
}
if (sch->cssid != channel_subsys->default_cssid) {
return (channel_subsys->max_cssid > 0);
}
return true;
}
bool css_present(uint8_t cssid)
{
return (channel_subsys->css[cssid] != NULL);
}
bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno)
{
if (!channel_subsys->css[cssid]) {
return false;
}
if (!channel_subsys->css[cssid]->sch_set[ssid]) {
return false;
}
return !!test_bit(devno,
channel_subsys->css[cssid]->sch_set[ssid]->devnos_used);
}
void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
uint16_t devno, SubchDev *sch)
{
CssImage *css;
SubchSet *s_set;
trace_css_assign_subch(sch ? "assign" : "deassign", cssid, ssid, schid,
devno);
if (!channel_subsys->css[cssid]) {
fprintf(stderr,
"Suspicious call to %s (%x.%x.%04x) for non-existing css!\n",
__func__, cssid, ssid, schid);
return;
}
css = channel_subsys->css[cssid];
if (!css->sch_set[ssid]) {
css->sch_set[ssid] = g_malloc0(sizeof(SubchSet));
}
s_set = css->sch_set[ssid];
s_set->sch[schid] = sch;
if (sch) {
set_bit(schid, s_set->schids_used);
set_bit(devno, s_set->devnos_used);
} else {
clear_bit(schid, s_set->schids_used);
clear_bit(devno, s_set->devnos_used);
}
}
void css_queue_crw(uint8_t rsc, uint8_t erc, int chain, uint16_t rsid)
{
CrwContainer *crw_cont;
trace_css_crw(rsc, erc, rsid, chain ? "(chained)" : "");
/* TODO: Maybe use a static crw pool? */
crw_cont = g_try_malloc0(sizeof(CrwContainer));
if (!crw_cont) {
channel_subsys->crws_lost = true;
return;
}
crw_cont->crw.flags = (rsc << 8) | erc;
if (chain) {
crw_cont->crw.flags |= CRW_FLAGS_MASK_C;
}
crw_cont->crw.rsid = rsid;
if (channel_subsys->crws_lost) {
crw_cont->crw.flags |= CRW_FLAGS_MASK_R;
channel_subsys->crws_lost = false;
}
QTAILQ_INSERT_TAIL(&channel_subsys->pending_crws, crw_cont, sibling);
if (channel_subsys->do_crw_mchk) {
S390CPU *cpu = s390_cpu_addr2state(0);
channel_subsys->do_crw_mchk = false;
/* Inject crw pending machine check. */
s390_crw_mchk(cpu);
}
}
void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,
int hotplugged, int add)
{
uint8_t guest_cssid;
bool chain_crw;
if (add && !hotplugged) {
return;
}
if (channel_subsys->max_cssid == 0) {
/* Default cssid shows up as 0. */
guest_cssid = (cssid == channel_subsys->default_cssid) ? 0 : cssid;
} else {
/* Show real cssid to the guest. */
guest_cssid = cssid;
}
/*
* Only notify for higher subchannel sets/channel subsystems if the
* guest has enabled it.
*/
if ((ssid > channel_subsys->max_ssid) ||
(guest_cssid > channel_subsys->max_cssid) ||
((channel_subsys->max_cssid == 0) &&
(cssid != channel_subsys->default_cssid))) {
return;
}
chain_crw = (channel_subsys->max_ssid > 0) ||
(channel_subsys->max_cssid > 0);
css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, chain_crw ? 1 : 0, schid);
if (chain_crw) {
css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, 0,
(guest_cssid << 8) | (ssid << 4));
}
}
void css_generate_chp_crws(uint8_t cssid, uint8_t chpid)
{
/* TODO */
}
int css_enable_mcsse(void)
{
trace_css_enable_facility("mcsse");
channel_subsys->max_cssid = MAX_CSSID;
return 0;
}
int css_enable_mss(void)
{
trace_css_enable_facility("mss");
channel_subsys->max_ssid = MAX_SSID;
return 0;
}
static void css_init(void)
{
channel_subsys = g_malloc0(sizeof(*channel_subsys));
QTAILQ_INIT(&channel_subsys->pending_crws);
channel_subsys->do_crw_mchk = true;
channel_subsys->crws_lost = false;
channel_subsys->chnmon_active = false;
}
machine_init(css_init);
void css_reset_sch(SubchDev *sch)
{
PMCW *p = &sch->curr_status.pmcw;
p->intparm = 0;
p->flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA |
PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME |
PMCW_FLAGS_MASK_MP | PMCW_FLAGS_MASK_TF);
p->flags |= PMCW_FLAGS_MASK_DNV;
p->devno = sch->devno;
p->pim = 0x80;
p->lpm = p->pim;
p->pnom = 0;
p->lpum = 0;
p->mbi = 0;
p->pom = 0xff;
p->pam = 0x80;
p->chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_XMWME |
PMCW_CHARS_MASK_CSENSE);
memset(&sch->curr_status.scsw, 0, sizeof(sch->curr_status.scsw));
sch->curr_status.mba = 0;
sch->channel_prog = 0x0;
sch->last_cmd_valid = false;
sch->orb = NULL;
}
void css_reset(void)
{
CrwContainer *crw_cont;
/* Clean up monitoring. */
channel_subsys->chnmon_active = false;
channel_subsys->chnmon_area = 0;
/* Clear pending CRWs. */
while ((crw_cont = QTAILQ_FIRST(&channel_subsys->pending_crws))) {
QTAILQ_REMOVE(&channel_subsys->pending_crws, crw_cont, sibling);
g_free(crw_cont);
}
channel_subsys->do_crw_mchk = true;
channel_subsys->crws_lost = false;
/* Reset maximum ids. */
channel_subsys->max_cssid = 0;
channel_subsys->max_ssid = 0;
}
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