meson: convert qapi-specific to meson
[qemu.git] / hw / acpi / cpu_hotplug.c
1 /*
2 * QEMU ACPI hotplug utilities
3 *
4 * Copyright (C) 2013 Red Hat Inc
5 *
6 * Authors:
7 * Igor Mammedov <imammedo@redhat.com>
8 *
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.
11 */
12 #include "qemu/osdep.h"
13 #include "hw/acpi/cpu_hotplug.h"
14 #include "qapi/error.h"
15 #include "hw/core/cpu.h"
16 #include "hw/i386/pc.h"
17 #include "hw/pci/pci.h"
18 #include "qemu/error-report.h"
19
20 #define CPU_EJECT_METHOD "CPEJ"
21 #define CPU_MAT_METHOD "CPMA"
22 #define CPU_ON_BITMAP "CPON"
23 #define CPU_STATUS_METHOD "CPST"
24 #define CPU_STATUS_MAP "PRS"
25 #define CPU_SCAN_METHOD "PRSC"
26
27 static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size)
28 {
29 AcpiCpuHotplug *cpus = opaque;
30 uint64_t val = cpus->sts[addr];
31
32 return val;
33 }
34
35 static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data,
36 unsigned int size)
37 {
38 /* firmware never used to write in CPU present bitmap so use
39 this fact as means to switch QEMU into modern CPU hotplug
40 mode by writing 0 at the beginning of legacy CPU bitmap
41 */
42 if (addr == 0 && data == 0) {
43 AcpiCpuHotplug *cpus = opaque;
44 object_property_set_bool(cpus->device, "cpu-hotplug-legacy", false,
45 &error_abort);
46 }
47 }
48
49 static const MemoryRegionOps AcpiCpuHotplug_ops = {
50 .read = cpu_status_read,
51 .write = cpu_status_write,
52 .endianness = DEVICE_LITTLE_ENDIAN,
53 .valid = {
54 .min_access_size = 1,
55 .max_access_size = 1,
56 },
57 };
58
59 static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu)
60 {
61 CPUClass *k = CPU_GET_CLASS(cpu);
62 int64_t cpu_id;
63
64 cpu_id = k->get_arch_id(cpu);
65 if ((cpu_id / 8) >= ACPI_GPE_PROC_LEN) {
66 object_property_set_bool(g->device, "cpu-hotplug-legacy", false,
67 &error_abort);
68 return;
69 }
70
71 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8));
72 }
73
74 void legacy_acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
75 AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
76 {
77 acpi_set_cpu_present_bit(g, CPU(dev));
78 acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
79 }
80
81 void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
82 AcpiCpuHotplug *gpe_cpu, uint16_t base)
83 {
84 CPUState *cpu;
85
86 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops,
87 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);
88 memory_region_add_subregion(parent, base, &gpe_cpu->io);
89 gpe_cpu->device = owner;
90
91 CPU_FOREACH(cpu) {
92 acpi_set_cpu_present_bit(gpe_cpu, cpu);
93 }
94 }
95
96 void acpi_switch_to_modern_cphp(AcpiCpuHotplug *gpe_cpu,
97 CPUHotplugState *cpuhp_state,
98 uint16_t io_port)
99 {
100 MemoryRegion *parent = pci_address_space_io(PCI_DEVICE(gpe_cpu->device));
101
102 memory_region_del_subregion(parent, &gpe_cpu->io);
103 cpu_hotplug_hw_init(parent, gpe_cpu->device, cpuhp_state, io_port);
104 }
105
106 void build_legacy_cpu_hotplug_aml(Aml *ctx, MachineState *machine,
107 uint16_t io_base)
108 {
109 Aml *dev;
110 Aml *crs;
111 Aml *pkg;
112 Aml *field;
113 Aml *method;
114 Aml *if_ctx;
115 Aml *else_ctx;
116 int i, apic_idx;
117 Aml *sb_scope = aml_scope("_SB");
118 uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
119 Aml *cpu_id = aml_arg(1);
120 Aml *apic_id = aml_arg(0);
121 Aml *cpu_on = aml_local(0);
122 Aml *madt = aml_local(1);
123 Aml *cpus_map = aml_name(CPU_ON_BITMAP);
124 Aml *zero = aml_int(0);
125 Aml *one = aml_int(1);
126 MachineClass *mc = MACHINE_GET_CLASS(machine);
127 const CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(machine);
128 X86MachineState *x86ms = X86_MACHINE(machine);
129
130 /*
131 * _MAT method - creates an madt apic buffer
132 * apic_id = Arg0 = Local APIC ID
133 * cpu_id = Arg1 = Processor ID
134 * cpu_on = Local0 = CPON flag for this cpu
135 * madt = Local1 = Buffer (in madt apic form) to return
136 */
137 method = aml_method(CPU_MAT_METHOD, 2, AML_NOTSERIALIZED);
138 aml_append(method,
139 aml_store(aml_derefof(aml_index(cpus_map, apic_id)), cpu_on));
140 aml_append(method,
141 aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt));
142 /* Update the processor id, lapic id, and enable/disable status */
143 aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2))));
144 aml_append(method, aml_store(apic_id, aml_index(madt, aml_int(3))));
145 aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4))));
146 aml_append(method, aml_return(madt));
147 aml_append(sb_scope, method);
148
149 /*
150 * _STA method - return ON status of cpu
151 * apic_id = Arg0 = Local APIC ID
152 * cpu_on = Local0 = CPON flag for this cpu
153 */
154 method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED);
155 aml_append(method,
156 aml_store(aml_derefof(aml_index(cpus_map, apic_id)), cpu_on));
157 if_ctx = aml_if(cpu_on);
158 {
159 aml_append(if_ctx, aml_return(aml_int(0xF)));
160 }
161 aml_append(method, if_ctx);
162 else_ctx = aml_else();
163 {
164 aml_append(else_ctx, aml_return(zero));
165 }
166 aml_append(method, else_ctx);
167 aml_append(sb_scope, method);
168
169 method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED);
170 aml_append(method, aml_sleep(200));
171 aml_append(sb_scope, method);
172
173 method = aml_method(CPU_SCAN_METHOD, 0, AML_NOTSERIALIZED);
174 {
175 Aml *while_ctx, *if_ctx2, *else_ctx2;
176 Aml *bus_check_evt = aml_int(1);
177 Aml *remove_evt = aml_int(3);
178 Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
179 Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
180 Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
181 Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
182 Aml *status = aml_local(3); /* Local3 = active state for cpu */
183
184 aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
185 aml_append(method, aml_store(zero, byte));
186 aml_append(method, aml_store(zero, idx));
187
188 /* While (idx < SizeOf(CPON)) */
189 while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
190 aml_append(while_ctx,
191 aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
192
193 if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
194 {
195 /* Shift down previously read bitmap byte */
196 aml_append(if_ctx, aml_shiftright(byte, one, byte));
197 }
198 aml_append(while_ctx, if_ctx);
199
200 else_ctx = aml_else();
201 {
202 /* Read next byte from cpu bitmap */
203 aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
204 aml_shiftright(idx, aml_int(3), NULL))), byte));
205 }
206 aml_append(while_ctx, else_ctx);
207
208 aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
209 if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
210 {
211 /* State change - update CPON with new state */
212 aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
213 if_ctx2 = aml_if(aml_equal(status, one));
214 {
215 aml_append(if_ctx2,
216 aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
217 }
218 aml_append(if_ctx, if_ctx2);
219 else_ctx2 = aml_else();
220 {
221 aml_append(else_ctx2,
222 aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
223 }
224 }
225 aml_append(if_ctx, else_ctx2);
226 aml_append(while_ctx, if_ctx);
227
228 aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
229 aml_append(method, while_ctx);
230 }
231 aml_append(sb_scope, method);
232
233 /* The current AML generator can cover the APIC ID range [0..255],
234 * inclusive, for VCPU hotplug. */
235 QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
236 if (x86ms->apic_id_limit > ACPI_CPU_HOTPLUG_ID_LIMIT) {
237 error_report("max_cpus is too large. APIC ID of last CPU is %u",
238 x86ms->apic_id_limit - 1);
239 exit(1);
240 }
241
242 /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */
243 dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE));
244 aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06")));
245 aml_append(dev,
246 aml_name_decl("_UID", aml_string("CPU Hotplug resources"))
247 );
248 /* device present, functioning, decoding, not shown in UI */
249 aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
250 crs = aml_resource_template();
251 aml_append(crs,
252 aml_io(AML_DECODE16, io_base, io_base, 1, ACPI_GPE_PROC_LEN)
253 );
254 aml_append(dev, aml_name_decl("_CRS", crs));
255 aml_append(sb_scope, dev);
256 /* declare CPU hotplug MMIO region and PRS field to access it */
257 aml_append(sb_scope, aml_operation_region(
258 "PRST", AML_SYSTEM_IO, aml_int(io_base), ACPI_GPE_PROC_LEN));
259 field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
260 aml_append(field, aml_named_field("PRS", 256));
261 aml_append(sb_scope, field);
262
263 /* build Processor object for each processor */
264 for (i = 0; i < apic_ids->len; i++) {
265 int apic_id = apic_ids->cpus[i].arch_id;
266
267 assert(apic_id < ACPI_CPU_HOTPLUG_ID_LIMIT);
268
269 dev = aml_processor(i, 0, 0, "CP%.02X", apic_id);
270
271 method = aml_method("_MAT", 0, AML_NOTSERIALIZED);
272 aml_append(method,
273 aml_return(aml_call2(CPU_MAT_METHOD, aml_int(apic_id), aml_int(i))
274 ));
275 aml_append(dev, method);
276
277 method = aml_method("_STA", 0, AML_NOTSERIALIZED);
278 aml_append(method,
279 aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(apic_id))));
280 aml_append(dev, method);
281
282 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
283 aml_append(method,
284 aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(apic_id),
285 aml_arg(0)))
286 );
287 aml_append(dev, method);
288
289 aml_append(sb_scope, dev);
290 }
291
292 /* build this code:
293 * Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...}
294 */
295 /* Arg0 = APIC ID */
296 method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
297 for (i = 0; i < apic_ids->len; i++) {
298 int apic_id = apic_ids->cpus[i].arch_id;
299
300 if_ctx = aml_if(aml_equal(aml_arg(0), aml_int(apic_id)));
301 aml_append(if_ctx,
302 aml_notify(aml_name("CP%.02X", apic_id), aml_arg(1))
303 );
304 aml_append(method, if_ctx);
305 }
306 aml_append(sb_scope, method);
307
308 /* build "Name(CPON, Package() { One, One, ..., Zero, Zero, ... })"
309 *
310 * Note: The ability to create variable-sized packages was first
311 * introduced in ACPI 2.0. ACPI 1.0 only allowed fixed-size packages
312 * ith up to 255 elements. Windows guests up to win2k8 fail when
313 * VarPackageOp is used.
314 */
315 pkg = x86ms->apic_id_limit <= 255 ? aml_package(x86ms->apic_id_limit) :
316 aml_varpackage(x86ms->apic_id_limit);
317
318 for (i = 0, apic_idx = 0; i < apic_ids->len; i++) {
319 int apic_id = apic_ids->cpus[i].arch_id;
320
321 for (; apic_idx < apic_id; apic_idx++) {
322 aml_append(pkg, aml_int(0));
323 }
324 aml_append(pkg, aml_int(apic_ids->cpus[i].cpu ? 1 : 0));
325 apic_idx = apic_id + 1;
326 }
327 aml_append(sb_scope, aml_name_decl(CPU_ON_BITMAP, pkg));
328 aml_append(ctx, sb_scope);
329
330 method = aml_method("\\_GPE._E02", 0, AML_NOTSERIALIZED);
331 aml_append(method, aml_call0("\\_SB." CPU_SCAN_METHOD));
332 aml_append(ctx, method);
333 }