qemu/hw/s390x/sclp.c
Markus Armbruster 992861fb1e error: Eliminate error_propagate() manually
When all we do with an Error we receive into a local variable is
propagating to somewhere else, we can just as well receive it there
right away.  The previous two commits did that for sufficiently simple
cases with Coccinelle.  Do it for several more manually.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-37-armbru@redhat.com>
2020-07-10 15:18:08 +02:00

420 lines
12 KiB
C

/*
* 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 "qemu/units.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 inline bool sclp_command_code_valid(uint32_t code)
{
switch (code & SCLP_CMD_CODE_MASK) {
case SCLP_CMDW_READ_SCP_INFO:
case SCLP_CMDW_READ_SCP_INFO_FORCED:
case SCLP_CMDW_READ_CPU_INFO:
case SCLP_CMDW_CONFIGURE_IOA:
case SCLP_CMDW_DECONFIGURE_IOA:
case SCLP_CMD_READ_EVENT_DATA:
case SCLP_CMD_WRITE_EVENT_DATA:
case SCLP_CMD_WRITE_EVENT_MASK:
return true;
}
return false;
}
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(machine->smp.max_cpus - 1);
read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
if (be16_to_cpu(sccb->h.length) <
(sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
return;
}
/* 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);
if (be16_to_cpu(sccb->h.length) <
(sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
return;
}
/* 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;
}
}
/*
* We only need the address to have something valid for the
* service_interrupt call.
*/
#define SCLP_PV_DUMMY_ADDR 0x4000
int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb,
uint32_t code)
{
SCLPDevice *sclp = get_sclp_device();
SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
SCCB work_sccb;
hwaddr sccb_len = sizeof(SCCB);
s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len);
if (!sclp_command_code_valid(code)) {
work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
goto out_write;
}
sclp_c->execute(sclp, &work_sccb, code);
out_write:
s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb,
be16_to_cpu(work_sccb.h.length));
sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR);
return 0;
}
int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
{
SCLPDevice *sclp = get_sclp_device();
SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
SCCB work_sccb;
hwaddr sccb_len = sizeof(SCCB);
/* first some basic checks on program checks */
if (env->psw.mask & PSW_MASK_PSTATE) {
return -PGM_PRIVILEGED;
}
if (cpu_physical_memory_is_io(sccb)) {
return -PGM_ADDRESSING;
}
if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
|| (sccb & ~0x7ffffff8UL) != 0) {
return -PGM_SPECIFICATION;
}
/*
* 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)) {
return -PGM_SPECIFICATION;
}
if (!sclp_command_code_valid(code)) {
work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
goto out_write;
}
if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) {
work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
goto out_write;
}
sclp_c->execute(sclp, &work_sccb, code);
out_write:
cpu_physical_memory_write(sccb, &work_sccb,
be16_to_cpu(work_sccb.h.length));
sclp_c->service_interrupt(sclp, sccb);
return 0;
}
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);
object_unref(new);
qdev_realize(DEVICE(new), NULL, &error_fatal);
}
static void sclp_realize(DeviceState *dev, Error **errp)
{
MachineState *machine = MACHINE(qdev_get_machine());
SCLPDevice *sclp = SCLP(dev);
uint64_t hw_limit;
int ret;
/*
* 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.
*/
if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) {
return;
}
ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
if (ret == -E2BIG) {
error_setg(errp, "host supports a maximum of %" PRIu64 " GB",
hw_limit / GiB);
} else if (ret) {
error_setg(errp, "setting the guest size failed");
}
}
static void sclp_memory_init(SCLPDevice *sclp)
{
MachineState *machine = MACHINE(qdev_get_machine());
MachineClass *machine_class = MACHINE_GET_CLASS(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.
* For some machine types, 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 (machine_class->fixup_ram_size != NULL &&
(initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
increment_size++;
}
sclp->increment_size = increment_size;
}
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);
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);