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qemu/hw/s390x/sclp.c

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/*
* SCLP Support
*
* Copyright IBM, Corp. 2012
*
* Authors:
* Christian Borntraeger <borntraeger@de.ibm.com>
* Heinz Graalfs <graalfs@linux.vnet.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 "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "sysemu/sysemu.h"
#include "hw/boards.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/event-facility.h"
#include "hw/s390x/s390-pci-bus.h"
#include "hw/s390x/ipl.h"
static inline SCLPDevice *get_sclp_device(void)
{
static SCLPDevice *sclp;
if (!sclp) {
sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
}
return sclp;
}
static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int *count)
{
MachineState *ms = MACHINE(qdev_get_machine());
uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
int i;
s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
if (!ms->possible_cpus->cpus[i].cpu) {
continue;
}
entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
entry[*count].type = 0;
memcpy(entry[*count].features, features, sizeof(features));
(*count)++;
}
}
/* Provide information about the configuration, CPUs and storage */
static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
{
ReadInfo *read_info = (ReadInfo *) sccb;
MachineState *machine = MACHINE(qdev_get_machine());
int cpu_count;
int rnsize, rnmax;
IplParameterBlock *ipib = s390_ipl_get_iplb();
/* CPU information */
prepare_cpu_entries(sclp, read_info->entries, &cpu_count);
read_info->entries_cpu = cpu_to_be16(cpu_count);
read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
read_info->highest_cpu = cpu_to_be16(max_cpus - 1);
read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
/* Configuration Characteristic (Extension) */
s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
read_info->conf_char);
s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
read_info->conf_char_ext);
read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
SCLP_HAS_IOA_RECONFIG);
read_info->mha_pow = s390_get_mha_pow();
read_info->hmfai = cpu_to_be32(s390_get_hmfai());
rnsize = 1 << (sclp->increment_size - 20);
if (rnsize <= 128) {
read_info->rnsize = rnsize;
} else {
read_info->rnsize = 0;
read_info->rnsize2 = cpu_to_be32(rnsize);
}
/* we don't support standby memory, maxram_size is never exposed */
rnmax = machine->ram_size >> sclp->increment_size;
if (rnmax < 0x10000) {
read_info->rnmax = cpu_to_be16(rnmax);
} else {
read_info->rnmax = cpu_to_be16(0);
read_info->rnmax2 = cpu_to_be64(rnmax);
}
if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
memcpy(&read_info->loadparm, &ipib->loadparm,
sizeof(read_info->loadparm));
} else {
s390_ipl_set_loadparm(read_info->loadparm);
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
}
/* Provide information about the CPU */
static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
{
ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
int cpu_count;
prepare_cpu_entries(sclp, cpu_info->entries, &cpu_count);
cpu_info->nr_configured = cpu_to_be16(cpu_count);
cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
cpu_info->nr_standby = cpu_to_be16(0);
/* The standby offset is 16-byte for each CPU */
cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
+ cpu_info->nr_configured*sizeof(CPUEntry));
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
}
static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
bool configure)
{
int rc;
if (be16_to_cpu(sccb->h.length) < 16) {
rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
goto out_err;
}
switch (((IoaCfgSccb *)sccb)->atype) {
case SCLP_RECONFIG_PCI_ATYPE:
if (s390_has_feat(S390_FEAT_ZPCI)) {
if (configure) {
s390_pci_sclp_configure(sccb);
} else {
s390_pci_sclp_deconfigure(sccb);
}
return;
}
/* fallthrough */
default:
rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
}
out_err:
sccb->h.response_code = cpu_to_be16(rc);
}
static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
{
SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
SCLPEventFacility *ef = sclp->event_facility;
SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
switch (code & SCLP_CMD_CODE_MASK) {
case SCLP_CMDW_READ_SCP_INFO:
case SCLP_CMDW_READ_SCP_INFO_FORCED:
sclp_c->read_SCP_info(sclp, sccb);
break;
case SCLP_CMDW_READ_CPU_INFO:
sclp_c->read_cpu_info(sclp, sccb);
break;
case SCLP_CMDW_CONFIGURE_IOA:
sclp_configure_io_adapter(sclp, sccb, true);
break;
case SCLP_CMDW_DECONFIGURE_IOA:
sclp_configure_io_adapter(sclp, sccb, false);
break;
default:
efc->command_handler(ef, sccb, code);
break;
}
}
int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
{
SCLPDevice *sclp = get_sclp_device();
SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
int r = 0;
SCCB work_sccb;
hwaddr sccb_len = sizeof(SCCB);
/* first some basic checks on program checks */
if (env->psw.mask & PSW_MASK_PSTATE) {
r = -PGM_PRIVILEGED;
goto out;
}
if (cpu_physical_memory_is_io(sccb)) {
r = -PGM_ADDRESSING;
goto out;
}
if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
|| (sccb & ~0x7ffffff8UL) != 0) {
r = -PGM_SPECIFICATION;
goto out;
}
/*
* we want to work on a private copy of the sccb, to prevent guests
* from playing dirty tricks by modifying the memory content after
* the host has checked the values
*/
cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
/* Valid sccb sizes */
if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
r = -PGM_SPECIFICATION;
goto out;
}
sclp_c->execute(sclp, &work_sccb, code);
cpu_physical_memory_write(sccb, &work_sccb,
be16_to_cpu(work_sccb.h.length));
sclp_c->service_interrupt(sclp, sccb);
out:
return r;
}
static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
{
SCLPEventFacility *ef = sclp->event_facility;
SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
uint32_t param = sccb & ~3;
/* Indicate whether an event is still pending */
param |= efc->event_pending(ef) ? 1 : 0;
if (!param) {
/* No need to send an interrupt, there's nothing to be notified about */
return;
}
s390_sclp_extint(param);
}
void sclp_service_interrupt(uint32_t sccb)
{
SCLPDevice *sclp = get_sclp_device();
SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
sclp_c->service_interrupt(sclp, sccb);
}
/* qemu object creation and initialization functions */
void s390_sclp_init(void)
{
Object *new = object_new(TYPE_SCLP);
object_property_add_child(qdev_get_machine(), TYPE_SCLP, new,
NULL);
object_unref(OBJECT(new));
qdev_init_nofail(DEVICE(new));
}
static void sclp_realize(DeviceState *dev, Error **errp)
{
MachineState *machine = MACHINE(qdev_get_machine());
SCLPDevice *sclp = SCLP(dev);
Error *err = NULL;
uint64_t hw_limit;
int ret;
object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
&err);
if (err) {
goto out;
}
/*
* qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
* as we can't find a fitting bus via the qom tree, we have to add the
* event facility to the sysbus, so e.g. a sclp console can be created.
*/
qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
if (ret == -E2BIG) {
error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
hw_limit >> 30);
} else if (ret) {
error_setg(&err, "setting the guest size failed");
}
out:
error_propagate(errp, err);
}
static void sclp_memory_init(SCLPDevice *sclp)
{
MachineState *machine = MACHINE(qdev_get_machine());
ram_addr_t initial_mem = machine->ram_size;
int increment_size = 20;
/* The storage increment size is a multiple of 1M and is a power of 2.
* The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
* The variable 'increment_size' is an exponent of 2 that can be
* used to calculate the size (in bytes) of an increment. */
while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
increment_size++;
}
sclp->increment_size = increment_size;
/* The core memory area needs to be aligned with the increment size.
* In effect, this can cause the user-specified memory size to be rounded
* down to align with the nearest increment boundary. */
initial_mem = initial_mem >> increment_size << increment_size;
machine->ram_size = initial_mem;
/* let's propagate the changed ram size into the global variable. */
ram_size = initial_mem;
}
static void sclp_init(Object *obj)
{
SCLPDevice *sclp = SCLP(obj);
Object *new;
new = object_new(TYPE_SCLP_EVENT_FACILITY);
object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
object_unref(new);
sclp->event_facility = EVENT_FACILITY(new);
sclp_memory_init(sclp);
}
static void sclp_class_init(ObjectClass *oc, void *data)
{
SCLPDeviceClass *sc = SCLP_CLASS(oc);
DeviceClass *dc = DEVICE_CLASS(oc);
dc->desc = "SCLP (Service-Call Logical Processor)";
dc->realize = sclp_realize;
dc->hotpluggable = false;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
/*
* Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
* which is a non-pluggable sysbus device
*/
dc->user_creatable = false;
sc->read_SCP_info = read_SCP_info;
sc->read_cpu_info = sclp_read_cpu_info;
sc->execute = sclp_execute;
sc->service_interrupt = service_interrupt;
}
static TypeInfo sclp_info = {
.name = TYPE_SCLP,
.parent = TYPE_DEVICE,
.instance_init = sclp_init,
.instance_size = sizeof(SCLPDevice),
.class_init = sclp_class_init,
.class_size = sizeof(SCLPDeviceClass),
};
static void register_types(void)
{
type_register_static(&sclp_info);
}
type_init(register_types);
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