/hw/acpi/cpu_hotplug.c
C | 337 lines | 248 code | 40 blank | 49 comment | 12 complexity | d832d36021fc7c9c1e4fb3b87fa8a62e MD5 | raw file
- /*
- * QEMU ACPI hotplug utilities
- *
- * Copyright (C) 2013 Red Hat Inc
- *
- * Authors:
- * Igor Mammedov <imammedo@redhat.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
- * See the COPYING file in the top-level directory.
- */
- #include "qemu/osdep.h"
- #include "hw/hw.h"
- #include "hw/acpi/cpu_hotplug.h"
- #include "qapi/error.h"
- #include "qom/cpu.h"
- #include "hw/i386/pc.h"
- #include "qemu/error-report.h"
- #define CPU_EJECT_METHOD "CPEJ"
- #define CPU_MAT_METHOD "CPMA"
- #define CPU_ON_BITMAP "CPON"
- #define CPU_STATUS_METHOD "CPST"
- #define CPU_STATUS_MAP "PRS"
- #define CPU_SCAN_METHOD "PRSC"
- static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size)
- {
- AcpiCpuHotplug *cpus = opaque;
- uint64_t val = cpus->sts[addr];
- return val;
- }
- static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data,
- unsigned int size)
- {
- /* firmware never used to write in CPU present bitmap so use
- this fact as means to switch QEMU into modern CPU hotplug
- mode by writing 0 at the beginning of legacy CPU bitmap
- */
- if (addr == 0 && data == 0) {
- AcpiCpuHotplug *cpus = opaque;
- object_property_set_bool(cpus->device, false, "cpu-hotplug-legacy",
- &error_abort);
- }
- }
- static const MemoryRegionOps AcpiCpuHotplug_ops = {
- .read = cpu_status_read,
- .write = cpu_status_write,
- .endianness = DEVICE_LITTLE_ENDIAN,
- .valid = {
- .min_access_size = 1,
- .max_access_size = 1,
- },
- };
- static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
- Error **errp)
- {
- CPUClass *k = CPU_GET_CLASS(cpu);
- int64_t cpu_id;
- cpu_id = k->get_arch_id(cpu);
- if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) {
- object_property_set_bool(g->device, false, "cpu-hotplug-legacy",
- &error_abort);
- return;
- }
- g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
- }
- void legacy_acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
- AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
- {
- acpi_set_cpu_present_bit(g, CPU(dev), errp);
- if (*errp != NULL) {
- return;
- }
- acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
- }
- void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
- AcpiCpuHotplug *gpe_cpu, uint16_t base)
- {
- CPUState *cpu;
- memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops,
- gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);
- memory_region_add_subregion(parent, base, &gpe_cpu->io);
- gpe_cpu->device = owner;
- CPU_FOREACH(cpu) {
- acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort);
- }
- }
- void acpi_switch_to_modern_cphp(AcpiCpuHotplug *gpe_cpu,
- CPUHotplugState *cpuhp_state,
- uint16_t io_port)
- {
- MemoryRegion *parent = pci_address_space_io(PCI_DEVICE(gpe_cpu->device));
- memory_region_del_subregion(parent, &gpe_cpu->io);
- cpu_hotplug_hw_init(parent, gpe_cpu->device, cpuhp_state, io_port);
- }
- void build_legacy_cpu_hotplug_aml(Aml *ctx, MachineState *machine,
- uint16_t io_base)
- {
- Aml *dev;
- Aml *crs;
- Aml *pkg;
- Aml *field;
- Aml *method;
- Aml *if_ctx;
- Aml *else_ctx;
- int i, apic_idx;
- Aml *sb_scope = aml_scope("_SB");
- uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
- Aml *cpu_id = aml_arg(1);
- Aml *apic_id = aml_arg(0);
- Aml *cpu_on = aml_local(0);
- Aml *madt = aml_local(1);
- Aml *cpus_map = aml_name(CPU_ON_BITMAP);
- Aml *zero = aml_int(0);
- Aml *one = aml_int(1);
- MachineClass *mc = MACHINE_GET_CLASS(machine);
- const CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(machine);
- PCMachineState *pcms = PC_MACHINE(machine);
- /*
- * _MAT method - creates an madt apic buffer
- * apic_id = Arg0 = Local APIC ID
- * cpu_id = Arg1 = Processor ID
- * cpu_on = Local0 = CPON flag for this cpu
- * madt = Local1 = Buffer (in madt apic form) to return
- */
- method = aml_method(CPU_MAT_METHOD, 2, AML_NOTSERIALIZED);
- aml_append(method,
- aml_store(aml_derefof(aml_index(cpus_map, apic_id)), cpu_on));
- aml_append(method,
- aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt));
- /* Update the processor id, lapic id, and enable/disable status */
- aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2))));
- aml_append(method, aml_store(apic_id, aml_index(madt, aml_int(3))));
- aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4))));
- aml_append(method, aml_return(madt));
- aml_append(sb_scope, method);
- /*
- * _STA method - return ON status of cpu
- * apic_id = Arg0 = Local APIC ID
- * cpu_on = Local0 = CPON flag for this cpu
- */
- method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED);
- aml_append(method,
- aml_store(aml_derefof(aml_index(cpus_map, apic_id)), cpu_on));
- if_ctx = aml_if(cpu_on);
- {
- aml_append(if_ctx, aml_return(aml_int(0xF)));
- }
- aml_append(method, if_ctx);
- else_ctx = aml_else();
- {
- aml_append(else_ctx, aml_return(zero));
- }
- aml_append(method, else_ctx);
- aml_append(sb_scope, method);
- method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED);
- aml_append(method, aml_sleep(200));
- aml_append(sb_scope, method);
- method = aml_method(CPU_SCAN_METHOD, 0, AML_NOTSERIALIZED);
- {
- Aml *while_ctx, *if_ctx2, *else_ctx2;
- Aml *bus_check_evt = aml_int(1);
- Aml *remove_evt = aml_int(3);
- Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
- Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
- Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
- Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
- Aml *status = aml_local(3); /* Local3 = active state for cpu */
- aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
- aml_append(method, aml_store(zero, byte));
- aml_append(method, aml_store(zero, idx));
- /* While (idx < SizeOf(CPON)) */
- while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
- aml_append(while_ctx,
- aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
- if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
- {
- /* Shift down previously read bitmap byte */
- aml_append(if_ctx, aml_shiftright(byte, one, byte));
- }
- aml_append(while_ctx, if_ctx);
- else_ctx = aml_else();
- {
- /* Read next byte from cpu bitmap */
- aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
- aml_shiftright(idx, aml_int(3), NULL))), byte));
- }
- aml_append(while_ctx, else_ctx);
- aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
- if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
- {
- /* State change - update CPON with new state */
- aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
- if_ctx2 = aml_if(aml_equal(status, one));
- {
- aml_append(if_ctx2,
- aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
- }
- aml_append(if_ctx, if_ctx2);
- else_ctx2 = aml_else();
- {
- aml_append(else_ctx2,
- aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
- }
- }
- aml_append(if_ctx, else_ctx2);
- aml_append(while_ctx, if_ctx);
- aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
- aml_append(method, while_ctx);
- }
- aml_append(sb_scope, method);
- /* The current AML generator can cover the APIC ID range [0..255],
- * inclusive, for VCPU hotplug. */
- QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
- if (pcms->apic_id_limit > ACPI_CPU_HOTPLUG_ID_LIMIT) {
- error_report("max_cpus is too large. APIC ID of last CPU is %u",
- pcms->apic_id_limit - 1);
- exit(1);
- }
- /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */
- dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE));
- aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06")));
- aml_append(dev,
- aml_name_decl("_UID", aml_string("CPU Hotplug resources"))
- );
- /* device present, functioning, decoding, not shown in UI */
- aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
- crs = aml_resource_template();
- aml_append(crs,
- aml_io(AML_DECODE16, io_base, io_base, 1, ACPI_GPE_PROC_LEN)
- );
- aml_append(dev, aml_name_decl("_CRS", crs));
- aml_append(sb_scope, dev);
- /* declare CPU hotplug MMIO region and PRS field to access it */
- aml_append(sb_scope, aml_operation_region(
- "PRST", AML_SYSTEM_IO, aml_int(io_base), ACPI_GPE_PROC_LEN));
- field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
- aml_append(field, aml_named_field("PRS", 256));
- aml_append(sb_scope, field);
- /* build Processor object for each processor */
- for (i = 0; i < apic_ids->len; i++) {
- int apic_id = apic_ids->cpus[i].arch_id;
- assert(apic_id < ACPI_CPU_HOTPLUG_ID_LIMIT);
- dev = aml_processor(i, 0, 0, "CP%.02X", apic_id);
- method = aml_method("_MAT", 0, AML_NOTSERIALIZED);
- aml_append(method,
- aml_return(aml_call2(CPU_MAT_METHOD, aml_int(apic_id), aml_int(i))
- ));
- aml_append(dev, method);
- method = aml_method("_STA", 0, AML_NOTSERIALIZED);
- aml_append(method,
- aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(apic_id))));
- aml_append(dev, method);
- method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
- aml_append(method,
- aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(apic_id),
- aml_arg(0)))
- );
- aml_append(dev, method);
- aml_append(sb_scope, dev);
- }
- /* build this code:
- * Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...}
- */
- /* Arg0 = APIC ID */
- method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
- for (i = 0; i < apic_ids->len; i++) {
- int apic_id = apic_ids->cpus[i].arch_id;
- if_ctx = aml_if(aml_equal(aml_arg(0), aml_int(apic_id)));
- aml_append(if_ctx,
- aml_notify(aml_name("CP%.02X", apic_id), aml_arg(1))
- );
- aml_append(method, if_ctx);
- }
- aml_append(sb_scope, method);
- /* build "Name(CPON, Package() { One, One, ..., Zero, Zero, ... })"
- *
- * Note: The ability to create variable-sized packages was first
- * introduced in ACPI 2.0. ACPI 1.0 only allowed fixed-size packages
- * ith up to 255 elements. Windows guests up to win2k8 fail when
- * VarPackageOp is used.
- */
- pkg = pcms->apic_id_limit <= 255 ? aml_package(pcms->apic_id_limit) :
- aml_varpackage(pcms->apic_id_limit);
- for (i = 0, apic_idx = 0; i < apic_ids->len; i++) {
- int apic_id = apic_ids->cpus[i].arch_id;
- for (; apic_idx < apic_id; apic_idx++) {
- aml_append(pkg, aml_int(0));
- }
- aml_append(pkg, aml_int(apic_ids->cpus[i].cpu ? 1 : 0));
- apic_idx = apic_id + 1;
- }
- aml_append(sb_scope, aml_name_decl(CPU_ON_BITMAP, pkg));
- aml_append(ctx, sb_scope);
- method = aml_method("\\_GPE._E02", 0, AML_NOTSERIALIZED);
- aml_append(method, aml_call0("\\_SB." CPU_SCAN_METHOD));
- aml_append(ctx, method);
- }