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qemu/hw/s390x/sclp.c
David Hildenbrand 515190d9da s390/sclp: introduce a root sclp device 
Let's create a root sclp device, which has other sclp devices as
children (e.g. the event facility for now) and can later be used
for migration of sclp specific attributes and setup of memory.

Reviewed-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2015-09-07 16:10:43 +02:00

532 lines
17 KiB
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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 "cpu.h"
#include "sysemu/kvm.h"
#include "exec/memory.h"
#include "sysemu/sysemu.h"
#include "exec/address-spaces.h"
#include "qemu/config-file.h"
#include "hw/s390x/sclp.h"
#include "hw/s390x/event-facility.h"
#include "hw/s390x/s390-pci-bus.h"
static inline SCLPEventFacility *get_event_facility(void)
{
return EVENT_FACILITY(object_resolve_path_type("", TYPE_SCLP_EVENT_FACILITY,
NULL));
}
/* Provide information about the configuration, CPUs and storage */
static void read_SCP_info(SCCB *sccb)
{
ReadInfo *read_info = (ReadInfo *) sccb;
sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
CPUState *cpu;
int cpu_count = 0;
int i = 0;
int increment_size = 20;
int rnsize, rnmax;
QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
int slots = qemu_opt_get_number(opts, "slots", 0);
int max_avail_slots = s390_get_memslot_count(kvm_state);
if (slots > max_avail_slots) {
slots = max_avail_slots;
}
CPU_FOREACH(cpu) {
cpu_count++;
}
/* CPU information */
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);
for (i = 0; i < cpu_count; i++) {
read_info->entries[i].address = i;
read_info->entries[i].type = 0;
}
read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
SCLP_HAS_PCI_RECONFIG);
/*
* 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.
*/
while ((ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
increment_size++;
}
rnmax = ram_size >> increment_size;
/* Memory Hotplug is only supported for the ccw machine type */
if (mhd) {
while ((mhd->standby_mem_size >> increment_size) >
MAX_STORAGE_INCREMENTS) {
increment_size++;
}
assert(increment_size == mhd->increment_size);
mhd->standby_subregion_size = MEM_SECTION_SIZE;
/* Deduct the memory slot already used for core */
if (slots > 0) {
while ((mhd->standby_subregion_size * (slots - 1)
< mhd->standby_mem_size)) {
mhd->standby_subregion_size = mhd->standby_subregion_size << 1;
}
}
/*
* Initialize mapping of guest standby memory sections indicating which
* are and are not online. Assume all standby memory begins offline.
*/
if (mhd->standby_state_map == 0) {
if (mhd->standby_mem_size % mhd->standby_subregion_size) {
mhd->standby_state_map = g_malloc0((mhd->standby_mem_size /
mhd->standby_subregion_size + 1) *
(mhd->standby_subregion_size /
MEM_SECTION_SIZE));
} else {
mhd->standby_state_map = g_malloc0(mhd->standby_mem_size /
MEM_SECTION_SIZE);
}
}
mhd->padded_ram_size = ram_size + mhd->pad_size;
mhd->rzm = 1 << mhd->increment_size;
rnmax = ((ram_size + mhd->standby_mem_size + mhd->pad_size)
>> mhd->increment_size);
read_info->facilities |= cpu_to_be64(SCLP_FC_ASSIGN_ATTACH_READ_STOR);
}
rnsize = 1 << (increment_size - 20);
if (rnsize <= 128) {
read_info->rnsize = rnsize;
} else {
read_info->rnsize = 0;
read_info->rnsize2 = cpu_to_be32(rnsize);
}
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);
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
}
static void read_storage_element0_info(SCCB *sccb)
{
int i, assigned;
int subincrement_id = SCLP_STARTING_SUBINCREMENT_ID;
ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
assert(mhd);
if ((ram_size >> mhd->increment_size) >= 0x10000) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
return;
}
/* Return information regarding core memory */
storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
assigned = ram_size >> mhd->increment_size;
storage_info->assigned = cpu_to_be16(assigned);
for (i = 0; i < assigned; i++) {
storage_info->entries[i] = cpu_to_be32(subincrement_id);
subincrement_id += SCLP_INCREMENT_UNIT;
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
}
static void read_storage_element1_info(SCCB *sccb)
{
ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
assert(mhd);
if ((mhd->standby_mem_size >> mhd->increment_size) >= 0x10000) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
return;
}
/* Return information regarding standby memory */
storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
storage_info->assigned = cpu_to_be16(mhd->standby_mem_size >>
mhd->increment_size);
storage_info->standby = cpu_to_be16(mhd->standby_mem_size >>
mhd->increment_size);
sccb->h.response_code = cpu_to_be16(SCLP_RC_STANDBY_READ_COMPLETION);
}
static void attach_storage_element(SCCB *sccb, uint16_t element)
{
int i, assigned, subincrement_id;
AttachStorageElement *attach_info = (AttachStorageElement *) sccb;
sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
assert(mhd);
if (element != 1) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
return;
}
assigned = mhd->standby_mem_size >> mhd->increment_size;
attach_info->assigned = cpu_to_be16(assigned);
subincrement_id = ((ram_size >> mhd->increment_size) << 16)
+ SCLP_STARTING_SUBINCREMENT_ID;
for (i = 0; i < assigned; i++) {
attach_info->entries[i] = cpu_to_be32(subincrement_id);
subincrement_id += SCLP_INCREMENT_UNIT;
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
}
static void assign_storage(SCCB *sccb)
{
MemoryRegion *mr = NULL;
uint64_t this_subregion_size;
AssignStorage *assign_info = (AssignStorage *) sccb;
sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
assert(mhd);
ram_addr_t assign_addr = (assign_info->rn - 1) * mhd->rzm;
MemoryRegion *sysmem = get_system_memory();
if ((assign_addr % MEM_SECTION_SIZE == 0) &&
(assign_addr >= mhd->padded_ram_size)) {
/* Re-use existing memory region if found */
mr = memory_region_find(sysmem, assign_addr, 1).mr;
memory_region_unref(mr);
if (!mr) {
MemoryRegion *standby_ram = g_new(MemoryRegion, 1);
/* offset to align to standby_subregion_size for allocation */
ram_addr_t offset = assign_addr -
(assign_addr - mhd->padded_ram_size)
% mhd->standby_subregion_size;
/* strlen("standby.ram") + 4 (Max of KVM_MEMORY_SLOTS) + NULL */
char id[16];
snprintf(id, 16, "standby.ram%d",
(int)((offset - mhd->padded_ram_size) /
mhd->standby_subregion_size) + 1);
/* Allocate a subregion of the calculated standby_subregion_size */
if (offset + mhd->standby_subregion_size >
mhd->padded_ram_size + mhd->standby_mem_size) {
this_subregion_size = mhd->padded_ram_size +
mhd->standby_mem_size - offset;
} else {
this_subregion_size = mhd->standby_subregion_size;
}
memory_region_init_ram(standby_ram, NULL, id, this_subregion_size, &error_abort);
/* This is a hack to make memory hotunplug work again. Once we have
* subdevices, we have to unparent them when unassigning memory,
* instead of doing it via the ref count of the MemoryRegion. */
object_ref(OBJECT(standby_ram));
object_unparent(OBJECT(standby_ram));
vmstate_register_ram_global(standby_ram);
memory_region_add_subregion(sysmem, offset, standby_ram);
}
/* The specified subregion is no longer in standby */
mhd->standby_state_map[(assign_addr - mhd->padded_ram_size)
/ MEM_SECTION_SIZE] = 1;
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
}
static void unassign_storage(SCCB *sccb)
{
MemoryRegion *mr = NULL;
AssignStorage *assign_info = (AssignStorage *) sccb;
sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
assert(mhd);
ram_addr_t unassign_addr = (assign_info->rn - 1) * mhd->rzm;
MemoryRegion *sysmem = get_system_memory();
/* if the addr is a multiple of 256 MB */
if ((unassign_addr % MEM_SECTION_SIZE == 0) &&
(unassign_addr >= mhd->padded_ram_size)) {
mhd->standby_state_map[(unassign_addr -
mhd->padded_ram_size) / MEM_SECTION_SIZE] = 0;
/* find the specified memory region and destroy it */
mr = memory_region_find(sysmem, unassign_addr, 1).mr;
memory_region_unref(mr);
if (mr) {
int i;
int is_removable = 1;
ram_addr_t map_offset = (unassign_addr - mhd->padded_ram_size -
(unassign_addr - mhd->padded_ram_size)
% mhd->standby_subregion_size);
/* Mark all affected subregions as 'standby' once again */
for (i = 0;
i < (mhd->standby_subregion_size / MEM_SECTION_SIZE);
i++) {
if (mhd->standby_state_map[i + map_offset / MEM_SECTION_SIZE]) {
is_removable = 0;
break;
}
}
if (is_removable) {
memory_region_del_subregion(sysmem, mr);
object_unref(OBJECT(mr));
}
}
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
}
/* Provide information about the CPU */
static void sclp_read_cpu_info(SCCB *sccb)
{
ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
CPUState *cpu;
int cpu_count = 0;
int i = 0;
CPU_FOREACH(cpu) {
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));
for (i = 0; i < cpu_count; i++) {
cpu_info->entries[i].address = i;
cpu_info->entries[i].type = 0;
}
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
}
static void sclp_execute(SCCB *sccb, uint32_t code)
{
SCLPEventFacility *ef = get_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:
read_SCP_info(sccb);
break;
case SCLP_CMDW_READ_CPU_INFO:
sclp_read_cpu_info(sccb);
break;
case SCLP_READ_STORAGE_ELEMENT_INFO:
if (code & 0xff00) {
read_storage_element1_info(sccb);
} else {
read_storage_element0_info(sccb);
}
break;
case SCLP_ATTACH_STORAGE_ELEMENT:
attach_storage_element(sccb, (code & 0xff00) >> 8);
break;
case SCLP_ASSIGN_STORAGE:
assign_storage(sccb);
break;
case SCLP_UNASSIGN_STORAGE:
unassign_storage(sccb);
break;
case SCLP_CMDW_CONFIGURE_PCI:
s390_pci_sclp_configure(1, sccb);
break;
case SCLP_CMDW_DECONFIGURE_PCI:
s390_pci_sclp_configure(0, sccb);
break;
default:
efc->command_handler(ef, sccb, code);
break;
}
}
int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
{
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_execute((SCCB *)&work_sccb, code);
cpu_physical_memory_write(sccb, &work_sccb,
be16_to_cpu(work_sccb.h.length));
sclp_service_interrupt(sccb);
out:
return r;
}
void sclp_service_interrupt(uint32_t sccb)
{
SCLPEventFacility *ef = get_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);
}
/* 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)
{
SCLPDevice *sclp = SCLP(dev);
Error *l_err = NULL;
object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
&l_err);
if (l_err) {
goto error;
}
return;
error:
assert(l_err);
error_propagate(errp, l_err);
}
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);
/* qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS */
qdev_set_parent_bus(DEVICE(new), sysbus_get_default());
object_unref(new);
sclp->event_facility = EVENT_FACILITY(new);
}
static void sclp_class_init(ObjectClass *oc, void *data)
{
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);
}
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),
};
sclpMemoryHotplugDev *init_sclp_memory_hotplug_dev(void)
{
DeviceState *dev;
dev = qdev_create(NULL, TYPE_SCLP_MEMORY_HOTPLUG_DEV);
object_property_add_child(qdev_get_machine(),
TYPE_SCLP_MEMORY_HOTPLUG_DEV,
OBJECT(dev), NULL);
qdev_init_nofail(dev);
return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
}
sclpMemoryHotplugDev *get_sclp_memory_hotplug_dev(void)
{
return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
}
static void sclp_memory_hotplug_dev_class_init(ObjectClass *klass,
void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static TypeInfo sclp_memory_hotplug_dev_info = {
.name = TYPE_SCLP_MEMORY_HOTPLUG_DEV,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(sclpMemoryHotplugDev),
.class_init = sclp_memory_hotplug_dev_class_init,
};
static void register_types(void)
{
type_register_static(&sclp_memory_hotplug_dev_info);
type_register_static(&sclp_info);
}
type_init(register_types);
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