2 * QEMU ACPI hotplug utilities
4 * Copyright (C) 2013 Red Hat Inc
7 * Igor Mammedov <imammedo@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
12 #include "qemu/osdep.h"
14 #include "hw/acpi/cpu_hotplug.h"
15 #include "qapi/error.h"
17 #include "hw/i386/pc.h"
19 #define CPU_EJECT_METHOD "CPEJ"
20 #define CPU_MAT_METHOD "CPMA"
21 #define CPU_ON_BITMAP "CPON"
22 #define CPU_STATUS_METHOD "CPST"
23 #define CPU_STATUS_MAP "PRS"
24 #define CPU_SCAN_METHOD "PRSC"
26 static uint64_t cpu_status_read(void *opaque
, hwaddr addr
, unsigned int size
)
28 AcpiCpuHotplug
*cpus
= opaque
;
29 uint64_t val
= cpus
->sts
[addr
];
34 static void cpu_status_write(void *opaque
, hwaddr addr
, uint64_t data
,
37 /* TODO: implement VCPU removal on guest signal that CPU can be removed */
40 static const MemoryRegionOps AcpiCpuHotplug_ops
= {
41 .read
= cpu_status_read
,
42 .write
= cpu_status_write
,
43 .endianness
= DEVICE_LITTLE_ENDIAN
,
50 static void acpi_set_cpu_present_bit(AcpiCpuHotplug
*g
, CPUState
*cpu
,
53 CPUClass
*k
= CPU_GET_CLASS(cpu
);
56 cpu_id
= k
->get_arch_id(cpu
);
57 if ((cpu_id
/ 8) >= ACPI_GPE_PROC_LEN
) {
58 error_setg(errp
, "acpi: invalid cpu id: %" PRIi64
, cpu_id
);
62 g
->sts
[cpu_id
/ 8] |= (1 << (cpu_id
% 8));
65 void legacy_acpi_cpu_plug_cb(ACPIREGS
*ar
, qemu_irq irq
,
66 AcpiCpuHotplug
*g
, DeviceState
*dev
, Error
**errp
)
68 acpi_set_cpu_present_bit(g
, CPU(dev
), errp
);
73 acpi_send_gpe_event(ar
, irq
, ACPI_CPU_HOTPLUG_STATUS
);
76 void legacy_acpi_cpu_hotplug_init(MemoryRegion
*parent
, Object
*owner
,
77 AcpiCpuHotplug
*gpe_cpu
, uint16_t base
)
82 acpi_set_cpu_present_bit(gpe_cpu
, cpu
, &error_abort
);
84 memory_region_init_io(&gpe_cpu
->io
, owner
, &AcpiCpuHotplug_ops
,
85 gpe_cpu
, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN
);
86 memory_region_add_subregion(parent
, base
, &gpe_cpu
->io
);
89 void build_legacy_cpu_hotplug_aml(Aml
*ctx
, MachineState
*machine
,
100 Aml
*sb_scope
= aml_scope("_SB");
101 uint8_t madt_tmpl
[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
102 Aml
*cpu_id
= aml_arg(0);
103 Aml
*cpu_on
= aml_local(0);
104 Aml
*madt
= aml_local(1);
105 Aml
*cpus_map
= aml_name(CPU_ON_BITMAP
);
106 Aml
*zero
= aml_int(0);
107 Aml
*one
= aml_int(1);
108 MachineClass
*mc
= MACHINE_GET_CLASS(machine
);
109 CPUArchIdList
*apic_ids
= mc
->possible_cpu_arch_ids(machine
);
110 PCMachineState
*pcms
= PC_MACHINE(machine
);
113 * _MAT method - creates an madt apic buffer
114 * cpu_id = Arg0 = Processor ID = Local APIC ID
115 * cpu_on = Local0 = CPON flag for this cpu
116 * madt = Local1 = Buffer (in madt apic form) to return
118 method
= aml_method(CPU_MAT_METHOD
, 1, AML_NOTSERIALIZED
);
120 aml_store(aml_derefof(aml_index(cpus_map
, cpu_id
)), cpu_on
));
122 aml_store(aml_buffer(sizeof(madt_tmpl
), madt_tmpl
), madt
));
123 /* Update the processor id, lapic id, and enable/disable status */
124 aml_append(method
, aml_store(cpu_id
, aml_index(madt
, aml_int(2))));
125 aml_append(method
, aml_store(cpu_id
, aml_index(madt
, aml_int(3))));
126 aml_append(method
, aml_store(cpu_on
, aml_index(madt
, aml_int(4))));
127 aml_append(method
, aml_return(madt
));
128 aml_append(sb_scope
, method
);
131 * _STA method - return ON status of cpu
132 * cpu_id = Arg0 = Processor ID = Local APIC ID
133 * cpu_on = Local0 = CPON flag for this cpu
135 method
= aml_method(CPU_STATUS_METHOD
, 1, AML_NOTSERIALIZED
);
137 aml_store(aml_derefof(aml_index(cpus_map
, cpu_id
)), cpu_on
));
138 if_ctx
= aml_if(cpu_on
);
140 aml_append(if_ctx
, aml_return(aml_int(0xF)));
142 aml_append(method
, if_ctx
);
143 else_ctx
= aml_else();
145 aml_append(else_ctx
, aml_return(zero
));
147 aml_append(method
, else_ctx
);
148 aml_append(sb_scope
, method
);
150 method
= aml_method(CPU_EJECT_METHOD
, 2, AML_NOTSERIALIZED
);
151 aml_append(method
, aml_sleep(200));
152 aml_append(sb_scope
, method
);
154 method
= aml_method(CPU_SCAN_METHOD
, 0, AML_NOTSERIALIZED
);
156 Aml
*while_ctx
, *if_ctx2
, *else_ctx2
;
157 Aml
*bus_check_evt
= aml_int(1);
158 Aml
*remove_evt
= aml_int(3);
159 Aml
*status_map
= aml_local(5); /* Local5 = active cpu bitmap */
160 Aml
*byte
= aml_local(2); /* Local2 = last read byte from bitmap */
161 Aml
*idx
= aml_local(0); /* Processor ID / APIC ID iterator */
162 Aml
*is_cpu_on
= aml_local(1); /* Local1 = CPON flag for cpu */
163 Aml
*status
= aml_local(3); /* Local3 = active state for cpu */
165 aml_append(method
, aml_store(aml_name(CPU_STATUS_MAP
), status_map
));
166 aml_append(method
, aml_store(zero
, byte
));
167 aml_append(method
, aml_store(zero
, idx
));
169 /* While (idx < SizeOf(CPON)) */
170 while_ctx
= aml_while(aml_lless(idx
, aml_sizeof(cpus_map
)));
171 aml_append(while_ctx
,
172 aml_store(aml_derefof(aml_index(cpus_map
, idx
)), is_cpu_on
));
174 if_ctx
= aml_if(aml_and(idx
, aml_int(0x07), NULL
));
176 /* Shift down previously read bitmap byte */
177 aml_append(if_ctx
, aml_shiftright(byte
, one
, byte
));
179 aml_append(while_ctx
, if_ctx
);
181 else_ctx
= aml_else();
183 /* Read next byte from cpu bitmap */
184 aml_append(else_ctx
, aml_store(aml_derefof(aml_index(status_map
,
185 aml_shiftright(idx
, aml_int(3), NULL
))), byte
));
187 aml_append(while_ctx
, else_ctx
);
189 aml_append(while_ctx
, aml_store(aml_and(byte
, one
, NULL
), status
));
190 if_ctx
= aml_if(aml_lnot(aml_equal(is_cpu_on
, status
)));
192 /* State change - update CPON with new state */
193 aml_append(if_ctx
, aml_store(status
, aml_index(cpus_map
, idx
)));
194 if_ctx2
= aml_if(aml_equal(status
, one
));
197 aml_call2(AML_NOTIFY_METHOD
, idx
, bus_check_evt
));
199 aml_append(if_ctx
, if_ctx2
);
200 else_ctx2
= aml_else();
202 aml_append(else_ctx2
,
203 aml_call2(AML_NOTIFY_METHOD
, idx
, remove_evt
));
206 aml_append(if_ctx
, else_ctx2
);
207 aml_append(while_ctx
, if_ctx
);
209 aml_append(while_ctx
, aml_increment(idx
)); /* go to next cpu */
210 aml_append(method
, while_ctx
);
212 aml_append(sb_scope
, method
);
214 /* The current AML generator can cover the APIC ID range [0..255],
215 * inclusive, for VCPU hotplug. */
216 QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT
> 256);
217 g_assert(pcms
->apic_id_limit
<= ACPI_CPU_HOTPLUG_ID_LIMIT
);
219 /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */
220 dev
= aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE
));
221 aml_append(dev
, aml_name_decl("_HID", aml_eisaid("PNP0A06")));
223 aml_name_decl("_UID", aml_string("CPU Hotplug resources"))
225 /* device present, functioning, decoding, not shown in UI */
226 aml_append(dev
, aml_name_decl("_STA", aml_int(0xB)));
227 crs
= aml_resource_template();
229 aml_io(AML_DECODE16
, io_base
, io_base
, 1, ACPI_GPE_PROC_LEN
)
231 aml_append(dev
, aml_name_decl("_CRS", crs
));
232 aml_append(sb_scope
, dev
);
233 /* declare CPU hotplug MMIO region and PRS field to access it */
234 aml_append(sb_scope
, aml_operation_region(
235 "PRST", AML_SYSTEM_IO
, aml_int(io_base
), ACPI_GPE_PROC_LEN
));
236 field
= aml_field("PRST", AML_BYTE_ACC
, AML_NOLOCK
, AML_PRESERVE
);
237 aml_append(field
, aml_named_field("PRS", 256));
238 aml_append(sb_scope
, field
);
240 /* build Processor object for each processor */
241 for (i
= 0; i
< apic_ids
->len
; i
++) {
242 int apic_id
= apic_ids
->cpus
[i
].arch_id
;
244 assert(apic_id
< ACPI_CPU_HOTPLUG_ID_LIMIT
);
246 dev
= aml_processor(apic_id
, 0, 0, "CP%.02X", apic_id
);
248 method
= aml_method("_MAT", 0, AML_NOTSERIALIZED
);
250 aml_return(aml_call1(CPU_MAT_METHOD
, aml_int(apic_id
))));
251 aml_append(dev
, method
);
253 method
= aml_method("_STA", 0, AML_NOTSERIALIZED
);
255 aml_return(aml_call1(CPU_STATUS_METHOD
, aml_int(apic_id
))));
256 aml_append(dev
, method
);
258 method
= aml_method("_EJ0", 1, AML_NOTSERIALIZED
);
260 aml_return(aml_call2(CPU_EJECT_METHOD
, aml_int(apic_id
),
263 aml_append(dev
, method
);
265 aml_append(sb_scope
, dev
);
269 * Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...}
271 /* Arg0 = Processor ID = APIC ID */
272 method
= aml_method(AML_NOTIFY_METHOD
, 2, AML_NOTSERIALIZED
);
273 for (i
= 0; i
< apic_ids
->len
; i
++) {
274 int apic_id
= apic_ids
->cpus
[i
].arch_id
;
276 if_ctx
= aml_if(aml_equal(aml_arg(0), aml_int(apic_id
)));
278 aml_notify(aml_name("CP%.02X", apic_id
), aml_arg(1))
280 aml_append(method
, if_ctx
);
282 aml_append(sb_scope
, method
);
284 /* build "Name(CPON, Package() { One, One, ..., Zero, Zero, ... })"
286 * Note: The ability to create variable-sized packages was first
287 * introduced in ACPI 2.0. ACPI 1.0 only allowed fixed-size packages
288 * ith up to 255 elements. Windows guests up to win2k8 fail when
289 * VarPackageOp is used.
291 pkg
= pcms
->apic_id_limit
<= 255 ? aml_package(pcms
->apic_id_limit
) :
292 aml_varpackage(pcms
->apic_id_limit
);
294 for (i
= 0, apic_idx
= 0; i
< apic_ids
->len
; i
++) {
295 int apic_id
= apic_ids
->cpus
[i
].arch_id
;
297 for (; apic_idx
< apic_id
; apic_idx
++) {
298 aml_append(pkg
, aml_int(0));
300 aml_append(pkg
, aml_int(apic_ids
->cpus
[i
].cpu
? 1 : 0));
301 apic_idx
= apic_id
+ 1;
303 aml_append(sb_scope
, aml_name_decl(CPU_ON_BITMAP
, pkg
));
306 aml_append(ctx
, sb_scope
);
308 method
= aml_method("\\_GPE._E02", 0, AML_NOTSERIALIZED
);
309 aml_append(method
, aml_call0("\\_SB." CPU_SCAN_METHOD
));
310 aml_append(ctx
, method
);