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qemu-e2k/hw/acpi/cpu.c
Igor Mammedov 3a61c8db9d acpi: cpuhp: add CPHP_GET_CPU_ID_CMD command 
Firmware can enumerate present at boot APs by broadcasting wakeup IPI,
so that woken up secondary CPUs could register them-selves.
However in CPU hotplug case, it would need to know architecture
specific CPU IDs for possible and hotplugged CPUs so it could
prepare environment for and wake hotplugged AP.

Reuse and extend existing CPU hotplug interface to return architecture
specific ID for currently selected CPU in 2 registers:
 - lower 32 bits in ACPI_CPU_CMD_DATA_OFFSET_RW
 - upper 32 bits in ACPI_CPU_CMD_DATA2_OFFSET_R

On x86, firmware will use CPHP_GET_CPU_ID_CMD for fetching the APIC ID
when handling hotplug SMI.

Later, CPHP_GET_CPU_ID_CMD will be used on ARM to retrieve MPIDR,
which serves the similar to APIC ID purpose.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1575896942-331151-10-git-send-email-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2020-01-22 00:23:07 -05:00

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#include "qemu/osdep.h"
#include "hw/boards.h"
#include "migration/vmstate.h"
#include "hw/acpi/cpu.h"
#include "qapi/error.h"
#include "qapi/qapi-events-misc.h"
#include "trace.h"
#include "sysemu/numa.h"
#define ACPI_CPU_HOTPLUG_REG_LEN 12
#define ACPI_CPU_SELECTOR_OFFSET_WR 0
#define ACPI_CPU_FLAGS_OFFSET_RW 4
#define ACPI_CPU_CMD_OFFSET_WR 5
#define ACPI_CPU_CMD_DATA_OFFSET_RW 8
#define ACPI_CPU_CMD_DATA2_OFFSET_R 0
enum {
CPHP_GET_NEXT_CPU_WITH_EVENT_CMD = 0,
CPHP_OST_EVENT_CMD = 1,
CPHP_OST_STATUS_CMD = 2,
CPHP_GET_CPU_ID_CMD = 3,
CPHP_CMD_MAX
};
static ACPIOSTInfo *acpi_cpu_device_status(int idx, AcpiCpuStatus *cdev)
{
ACPIOSTInfo *info = g_new0(ACPIOSTInfo, 1);
info->slot_type = ACPI_SLOT_TYPE_CPU;
info->slot = g_strdup_printf("%d", idx);
info->source = cdev->ost_event;
info->status = cdev->ost_status;
if (cdev->cpu) {
DeviceState *dev = DEVICE(cdev->cpu);
if (dev->id) {
info->device = g_strdup(dev->id);
info->has_device = true;
}
}
return info;
}
void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list)
{
int i;
for (i = 0; i < cpu_st->dev_count; i++) {
ACPIOSTInfoList *elem = g_new0(ACPIOSTInfoList, 1);
elem->value = acpi_cpu_device_status(i, &cpu_st->devs[i]);
elem->next = NULL;
**list = elem;
*list = &elem->next;
}
}
static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
{
uint64_t val = 0;
CPUHotplugState *cpu_st = opaque;
AcpiCpuStatus *cdev;
if (cpu_st->selector >= cpu_st->dev_count) {
return val;
}
cdev = &cpu_st->devs[cpu_st->selector];
switch (addr) {
case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
val |= cdev->cpu ? 1 : 0;
val |= cdev->is_inserting ? 2 : 0;
val |= cdev->is_removing ? 4 : 0;
trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
break;
case ACPI_CPU_CMD_DATA_OFFSET_RW:
switch (cpu_st->command) {
case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
val = cpu_st->selector;
break;
case CPHP_GET_CPU_ID_CMD:
val = cdev->arch_id & 0xFFFFFFFF;
break;
default:
break;
}
trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val);
break;
case ACPI_CPU_CMD_DATA2_OFFSET_R:
switch (cpu_st->command) {
case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
val = 0;
break;
case CPHP_GET_CPU_ID_CMD:
val = cdev->arch_id >> 32;
break;
default:
break;
}
trace_cpuhp_acpi_read_cmd_data2(cpu_st->selector, val);
break;
default:
break;
}
return val;
}
static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
unsigned int size)
{
CPUHotplugState *cpu_st = opaque;
AcpiCpuStatus *cdev;
ACPIOSTInfo *info;
assert(cpu_st->dev_count);
if (addr) {
if (cpu_st->selector >= cpu_st->dev_count) {
trace_cpuhp_acpi_invalid_idx_selected(cpu_st->selector);
return;
}
}
switch (addr) {
case ACPI_CPU_SELECTOR_OFFSET_WR: /* current CPU selector */
cpu_st->selector = data;
trace_cpuhp_acpi_write_idx(cpu_st->selector);
break;
case ACPI_CPU_FLAGS_OFFSET_RW: /* set is_* fields */
cdev = &cpu_st->devs[cpu_st->selector];
if (data & 2) { /* clear insert event */
cdev->is_inserting = false;
trace_cpuhp_acpi_clear_inserting_evt(cpu_st->selector);
} else if (data & 4) { /* clear remove event */
cdev->is_removing = false;
trace_cpuhp_acpi_clear_remove_evt(cpu_st->selector);
} else if (data & 8) {
DeviceState *dev = NULL;
HotplugHandler *hotplug_ctrl = NULL;
if (!cdev->cpu || cdev->cpu == first_cpu) {
trace_cpuhp_acpi_ejecting_invalid_cpu(cpu_st->selector);
break;
}
trace_cpuhp_acpi_ejecting_cpu(cpu_st->selector);
dev = DEVICE(cdev->cpu);
hotplug_ctrl = qdev_get_hotplug_handler(dev);
hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
object_unparent(OBJECT(dev));
}
break;
case ACPI_CPU_CMD_OFFSET_WR:
trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
if (data < CPHP_CMD_MAX) {
cpu_st->command = data;
if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
uint32_t iter = cpu_st->selector;
do {
cdev = &cpu_st->devs[iter];
if (cdev->is_inserting || cdev->is_removing) {
cpu_st->selector = iter;
trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
cdev->is_inserting, cdev->is_removing);
break;
}
iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
} while (iter != cpu_st->selector);
}
}
break;
case ACPI_CPU_CMD_DATA_OFFSET_RW:
switch (cpu_st->command) {
case CPHP_OST_EVENT_CMD: {
cdev = &cpu_st->devs[cpu_st->selector];
cdev->ost_event = data;
trace_cpuhp_acpi_write_ost_ev(cpu_st->selector, cdev->ost_event);
break;
}
case CPHP_OST_STATUS_CMD: {
cdev = &cpu_st->devs[cpu_st->selector];
cdev->ost_status = data;
info = acpi_cpu_device_status(cpu_st->selector, cdev);
qapi_event_send_acpi_device_ost(info);
qapi_free_ACPIOSTInfo(info);
trace_cpuhp_acpi_write_ost_status(cpu_st->selector,
cdev->ost_status);
break;
}
default:
break;
}
break;
default:
break;
}
}
static const MemoryRegionOps cpu_hotplug_ops = {
.read = cpu_hotplug_rd,
.write = cpu_hotplug_wr,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
},
};
void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
CPUHotplugState *state, hwaddr base_addr)
{
MachineState *machine = MACHINE(qdev_get_machine());
MachineClass *mc = MACHINE_GET_CLASS(machine);
const CPUArchIdList *id_list;
int i;
assert(mc->possible_cpu_arch_ids);
id_list = mc->possible_cpu_arch_ids(machine);
state->dev_count = id_list->len;
state->devs = g_new0(typeof(*state->devs), state->dev_count);
for (i = 0; i < id_list->len; i++) {
state->devs[i].cpu = CPU(id_list->cpus[i].cpu);
state->devs[i].arch_id = id_list->cpus[i].arch_id;
}
memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
"acpi-mem-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
}
static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
{
CPUClass *k = CPU_GET_CLASS(dev);
uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
int i;
for (i = 0; i < cpu_st->dev_count; i++) {
if (cpu_arch_id == cpu_st->devs[i].arch_id) {
return &cpu_st->devs[i];
}
}
return NULL;
}
void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
CPUHotplugState *cpu_st, DeviceState *dev, Error **errp)
{
AcpiCpuStatus *cdev;
cdev = get_cpu_status(cpu_st, dev);
if (!cdev) {
return;
}
cdev->cpu = CPU(dev);
if (dev->hotplugged) {
cdev->is_inserting = true;
acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
}
}
void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
CPUHotplugState *cpu_st,
DeviceState *dev, Error **errp)
{
AcpiCpuStatus *cdev;
cdev = get_cpu_status(cpu_st, dev);
if (!cdev) {
return;
}
cdev->is_removing = true;
acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
}
void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
DeviceState *dev, Error **errp)
{
AcpiCpuStatus *cdev;
cdev = get_cpu_status(cpu_st, dev);
if (!cdev) {
return;
}
cdev->cpu = NULL;
}
static const VMStateDescription vmstate_cpuhp_sts = {
.name = "CPU hotplug device state",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
VMSTATE_BOOL(is_removing, AcpiCpuStatus),
VMSTATE_UINT32(ost_event, AcpiCpuStatus),
VMSTATE_UINT32(ost_status, AcpiCpuStatus),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_cpu_hotplug = {
.name = "CPU hotplug state",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(selector, CPUHotplugState),
VMSTATE_UINT8(command, CPUHotplugState),
VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
vmstate_cpuhp_sts, AcpiCpuStatus),
VMSTATE_END_OF_LIST()
}
};
#define CPU_NAME_FMT "C%.03X"
#define CPUHP_RES_DEVICE "PRES"
#define CPU_LOCK "CPLK"
#define CPU_STS_METHOD "CSTA"
#define CPU_SCAN_METHOD "CSCN"
#define CPU_NOTIFY_METHOD "CTFY"
#define CPU_EJECT_METHOD "CEJ0"
#define CPU_OST_METHOD "COST"
#define CPU_ENABLED "CPEN"
#define CPU_SELECTOR "CSEL"
#define CPU_COMMAND "CCMD"
#define CPU_DATA "CDAT"
#define CPU_INSERT_EVENT "CINS"
#define CPU_REMOVE_EVENT "CRMV"
#define CPU_EJECT_EVENT "CEJ0"
void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
hwaddr io_base,
const char *res_root,
const char *event_handler_method)
{
Aml *ifctx;
Aml *field;
Aml *method;
Aml *cpu_ctrl_dev;
Aml *cpus_dev;
Aml *zero = aml_int(0);
Aml *one = aml_int(1);
Aml *sb_scope = aml_scope("_SB");
MachineClass *mc = MACHINE_GET_CLASS(machine);
const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
cpu_ctrl_dev = aml_device("%s", cphp_res_path);
{
Aml *crs;
aml_append(cpu_ctrl_dev,
aml_name_decl("_HID", aml_eisaid("PNP0A06")));
aml_append(cpu_ctrl_dev,
aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
crs = aml_resource_template();
aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
ACPI_CPU_HOTPLUG_REG_LEN));
aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
/* declare CPU hotplug MMIO region with related access fields */
aml_append(cpu_ctrl_dev,
aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
ACPI_CPU_HOTPLUG_REG_LEN));
field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
AML_WRITE_AS_ZEROS);
aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
/* 1 if enabled, read only */
aml_append(field, aml_named_field(CPU_ENABLED, 1));
/* (read) 1 if has a insert event. (write) 1 to clear event */
aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
/* (read) 1 if has a remove event. (write) 1 to clear event */
aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
/* initiates device eject, write only */
aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
aml_append(field, aml_reserved_field(4));
aml_append(field, aml_named_field(CPU_COMMAND, 8));
aml_append(cpu_ctrl_dev, field);
field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
/* CPU selector, write only */
aml_append(field, aml_named_field(CPU_SELECTOR, 32));
/* flags + cmd + 2byte align */
aml_append(field, aml_reserved_field(4 * 8));
aml_append(field, aml_named_field(CPU_DATA, 32));
aml_append(cpu_ctrl_dev, field);
if (opts.has_legacy_cphp) {
method = aml_method("_INI", 0, AML_SERIALIZED);
/* switch off legacy CPU hotplug HW and use new one,
* on reboot system is in new mode and writing 0
* in CPU_SELECTOR selects BSP, which is NOP at
* the time _INI is called */
aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR)));
aml_append(cpu_ctrl_dev, method);
}
}
aml_append(sb_scope, cpu_ctrl_dev);
cpus_dev = aml_device("\\_SB.CPUS");
{
int i;
Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
for (i = 0; i < arch_ids->len; i++) {
Aml *cpu = aml_name(CPU_NAME_FMT, i);
Aml *uid = aml_arg(0);
Aml *event = aml_arg(1);
ifctx = aml_if(aml_equal(uid, aml_int(i)));
{
aml_append(ifctx, aml_notify(cpu, event));
}
aml_append(method, ifctx);
}
aml_append(cpus_dev, method);
method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
{
Aml *idx = aml_arg(0);
Aml *sta = aml_local(0);
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
aml_append(method, aml_store(idx, cpu_selector));
aml_append(method, aml_store(zero, sta));
ifctx = aml_if(aml_equal(is_enabled, one));
{
aml_append(ifctx, aml_store(aml_int(0xF), sta));
}
aml_append(method, ifctx);
aml_append(method, aml_release(ctrl_lock));
aml_append(method, aml_return(sta));
}
aml_append(cpus_dev, method);
method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
{
Aml *idx = aml_arg(0);
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
aml_append(method, aml_store(idx, cpu_selector));
aml_append(method, aml_store(one, ej_evt));
aml_append(method, aml_release(ctrl_lock));
}
aml_append(cpus_dev, method);
method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
{
Aml *else_ctx;
Aml *while_ctx;
Aml *has_event = aml_local(0);
Aml *dev_chk = aml_int(1);
Aml *eject_req = aml_int(3);
Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
aml_append(method, aml_store(one, has_event));
while_ctx = aml_while(aml_equal(has_event, one));
{
/* clear loop exit condition, ins_evt/rm_evt checks
* will set it to 1 while next_cpu_cmd returns a CPU
* with events */
aml_append(while_ctx, aml_store(zero, has_event));
aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
ifctx = aml_if(aml_equal(ins_evt, one));
{
aml_append(ifctx,
aml_call2(CPU_NOTIFY_METHOD, cpu_data, dev_chk));
aml_append(ifctx, aml_store(one, ins_evt));
aml_append(ifctx, aml_store(one, has_event));
}
aml_append(while_ctx, ifctx);
else_ctx = aml_else();
ifctx = aml_if(aml_equal(rm_evt, one));
{
aml_append(ifctx,
aml_call2(CPU_NOTIFY_METHOD, cpu_data, eject_req));
aml_append(ifctx, aml_store(one, rm_evt));
aml_append(ifctx, aml_store(one, has_event));
}
aml_append(else_ctx, ifctx);
aml_append(while_ctx, else_ctx);
}
aml_append(method, while_ctx);
aml_append(method, aml_release(ctrl_lock));
}
aml_append(cpus_dev, method);
method = aml_method(CPU_OST_METHOD, 4, AML_SERIALIZED);
{
Aml *uid = aml_arg(0);
Aml *ev_cmd = aml_int(CPHP_OST_EVENT_CMD);
Aml *st_cmd = aml_int(CPHP_OST_STATUS_CMD);
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
aml_append(method, aml_store(uid, cpu_selector));
aml_append(method, aml_store(ev_cmd, cpu_cmd));
aml_append(method, aml_store(aml_arg(1), cpu_data));
aml_append(method, aml_store(st_cmd, cpu_cmd));
aml_append(method, aml_store(aml_arg(2), cpu_data));
aml_append(method, aml_release(ctrl_lock));
}
aml_append(cpus_dev, method);
/* build Processor object for each processor */
for (i = 0; i < arch_ids->len; i++) {
Aml *dev;
Aml *uid = aml_int(i);
GArray *madt_buf = g_array_new(0, 1, 1);
int arch_id = arch_ids->cpus[i].arch_id;
if (opts.acpi_1_compatible && arch_id < 255) {
dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
} else {
dev = aml_device(CPU_NAME_FMT, i);
aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
aml_append(dev, aml_name_decl("_UID", uid));
}
method = aml_method("_STA", 0, AML_SERIALIZED);
aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
aml_append(dev, method);
/* build _MAT object */
assert(adevc && adevc->madt_cpu);
adevc->madt_cpu(adev, i, arch_ids, madt_buf);
switch (madt_buf->data[0]) {
case ACPI_APIC_PROCESSOR: {
AcpiMadtProcessorApic *apic = (void *)madt_buf->data;
apic->flags = cpu_to_le32(1);
break;
}
case ACPI_APIC_LOCAL_X2APIC: {
AcpiMadtProcessorX2Apic *apic = (void *)madt_buf->data;
apic->flags = cpu_to_le32(1);
break;
}
default:
assert(0);
}
aml_append(dev, aml_name_decl("_MAT",
aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
g_array_free(madt_buf, true);
if (CPU(arch_ids->cpus[i].cpu) != first_cpu) {
method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
aml_append(dev, method);
}
method = aml_method("_OST", 3, AML_SERIALIZED);
aml_append(method,
aml_call4(CPU_OST_METHOD, uid, aml_arg(0),
aml_arg(1), aml_arg(2))
);
aml_append(dev, method);
/* Linux guests discard SRAT info for non-present CPUs
* as a result _PXM is required for all CPUs which might
* be hot-plugged. For simplicity, add it for all CPUs.
*/
if (arch_ids->cpus[i].props.has_node_id) {
aml_append(dev, aml_name_decl("_PXM",
aml_int(arch_ids->cpus[i].props.node_id)));
}
aml_append(cpus_dev, dev);
}
}
aml_append(sb_scope, cpus_dev);
aml_append(table, sb_scope);
method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
aml_append(table, method);
g_free(cphp_res_path);
}
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