in hw/acpi/cpu.c [343:711]
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));
/* tell firmware to do device eject, write only */
aml_append(field, aml_named_field(CPU_FW_EJECT_EVENT, 1));
aml_append(field, aml_reserved_field(3));
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 *fw_ej_evt = aml_name("%s.%s", cphp_res_path, CPU_FW_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));
if (opts.fw_unplugs_cpu) {
aml_append(method, aml_store(one, fw_ej_evt));
aml_append(method, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
aml_name("%s", opts.smi_path)));
} else {
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);
{
const uint8_t max_cpus_per_pass = 255;
Aml *else_ctx;
Aml *while_ctx, *while_ctx2;
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 *num_added_cpus = aml_local(1);
Aml *cpu_idx = aml_local(2);
Aml *uid = aml_local(3);
Aml *has_job = aml_local(4);
Aml *new_cpus = aml_name(CPU_ADDED_LIST);
aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
/*
* Windows versions newer than XP (including Windows 10/Windows
* Server 2019), do support* VarPackageOp but, it is cripled to hold
* the same elements number as old PackageOp.
* For compatibility with Windows XP (so it won't crash) use ACPI1.0
* PackageOp which can hold max 255 elements.
*
* use named package as old Windows don't support it in local var
*/
aml_append(method, aml_name_decl(CPU_ADDED_LIST,
aml_package(max_cpus_per_pass)));
aml_append(method, aml_store(zero, uid));
aml_append(method, aml_store(one, has_job));
/*
* CPU_ADDED_LIST can hold limited number of elements, outer loop
* allows to process CPUs in batches which let us to handle more
* CPUs than CPU_ADDED_LIST can hold.
*/
while_ctx2 = aml_while(aml_equal(has_job, one));
{
aml_append(while_ctx2, aml_store(zero, has_job));
aml_append(while_ctx2, aml_store(one, has_event));
aml_append(while_ctx2, aml_store(zero, num_added_cpus));
/*
* Scan CPUs, till there are CPUs with events or
* CPU_ADDED_LIST capacity is exhausted
*/
while_ctx = aml_while(aml_land(aml_equal(has_event, one),
aml_lless(uid, aml_int(arch_ids->len))));
{
/*
* 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(uid, cpu_selector));
aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
/*
* wrap around case, scan is complete, exit loop.
* It happens since events are not cleared in scan loop,
* so next_cpu_cmd continues to find already processed CPUs
*/
ifctx = aml_if(aml_lless(cpu_data, uid));
{
aml_append(ifctx, aml_break());
}
aml_append(while_ctx, ifctx);
/*
* if CPU_ADDED_LIST is full, exit inner loop and process
* collected CPUs
*/
ifctx = aml_if(
aml_equal(num_added_cpus, aml_int(max_cpus_per_pass)));
{
aml_append(ifctx, aml_store(one, has_job));
aml_append(ifctx, aml_break());
}
aml_append(while_ctx, ifctx);
aml_append(while_ctx, aml_store(cpu_data, uid));
ifctx = aml_if(aml_equal(ins_evt, one));
{
/* cache added CPUs to Notify/Wakeup later */
aml_append(ifctx, aml_store(uid,
aml_index(new_cpus, num_added_cpus)));
aml_append(ifctx, aml_increment(num_added_cpus));
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, uid, 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(while_ctx, aml_increment(uid));
}
aml_append(while_ctx2, while_ctx);
/*
* in case FW negotiated ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT,
* make upcall to FW, so it can pull in new CPUs before
* OS is notified and wakes them up
*/
if (opts.smi_path) {
ifctx = aml_if(aml_lgreater(num_added_cpus, zero));
{
aml_append(ifctx, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
aml_name("%s", opts.smi_path)));
}
aml_append(while_ctx2, ifctx);
}
/* Notify OSPM about new CPUs and clear insert events */
aml_append(while_ctx2, aml_store(zero, cpu_idx));
while_ctx = aml_while(aml_lless(cpu_idx, num_added_cpus));
{
aml_append(while_ctx,
aml_store(aml_derefof(aml_index(new_cpus, cpu_idx)),
uid));
aml_append(while_ctx,
aml_call2(CPU_NOTIFY_METHOD, uid, dev_chk));
aml_append(while_ctx, aml_store(uid, aml_debug()));
aml_append(while_ctx, aml_store(uid, cpu_selector));
aml_append(while_ctx, aml_store(one, ins_evt));
aml_append(while_ctx, aml_increment(cpu_idx));
}
aml_append(while_ctx2, while_ctx);
/*
* If another batch is needed, then it will resume scanning
* exactly at -- and not after -- the last CPU that's currently
* in CPU_ADDED_LIST. In other words, the last CPU in
* CPU_ADDED_LIST is going to be re-checked. That's OK: we've
* just cleared the insert event for *all* CPUs in
* CPU_ADDED_LIST, including the last one. So the scan will
* simply seek past it.
*/
}
aml_append(method, while_ctx2);
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,
true); /* set enabled flag */
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);
}