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/hw.h" 14 #include "hw/acpi/cpu_hotplug.h" 15 #include "qapi/error.h" 16 #include "qom/cpu.h" 17 #include "hw/i386/pc.h" 18 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" 25 26 static uint64_t cpu_status_read(void *opaque, hwaddr addr, unsigned int size) 27 { 28 AcpiCpuHotplug *cpus = opaque; 29 uint64_t val = cpus->sts[addr]; 30 31 return val; 32 } 33 34 static void cpu_status_write(void *opaque, hwaddr addr, uint64_t data, 35 unsigned int size) 36 { 37 /* TODO: implement VCPU removal on guest signal that CPU can be removed */ 38 } 39 40 static const MemoryRegionOps AcpiCpuHotplug_ops = { 41 .read = cpu_status_read, 42 .write = cpu_status_write, 43 .endianness = DEVICE_LITTLE_ENDIAN, 44 .valid = { 45 .min_access_size = 1, 46 .max_access_size = 1, 47 }, 48 }; 49 50 static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu, 51 Error **errp) 52 { 53 CPUClass *k = CPU_GET_CLASS(cpu); 54 int64_t cpu_id; 55 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); 59 return; 60 } 61 62 g->sts[cpu_id / 8] |= (1 << (cpu_id % 8)); 63 } 64 65 void legacy_acpi_cpu_plug_cb(HotplugHandler *hotplug_dev, 66 AcpiCpuHotplug *g, DeviceState *dev, Error **errp) 67 { 68 acpi_set_cpu_present_bit(g, CPU(dev), errp); 69 if (*errp != NULL) { 70 return; 71 } 72 acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS); 73 } 74 75 void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner, 76 AcpiCpuHotplug *gpe_cpu, uint16_t base) 77 { 78 CPUState *cpu; 79 80 CPU_FOREACH(cpu) { 81 acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort); 82 } 83 memory_region_init_io(&gpe_cpu->io, owner, &AcpiCpuHotplug_ops, 84 gpe_cpu, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN); 85 memory_region_add_subregion(parent, base, &gpe_cpu->io); 86 } 87 88 void build_legacy_cpu_hotplug_aml(Aml *ctx, MachineState *machine, 89 uint16_t io_base) 90 { 91 Aml *dev; 92 Aml *crs; 93 Aml *pkg; 94 Aml *field; 95 Aml *method; 96 Aml *if_ctx; 97 Aml *else_ctx; 98 int i, apic_idx; 99 Aml *sb_scope = aml_scope("_SB"); 100 uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0}; 101 Aml *cpu_id = aml_arg(1); 102 Aml *apic_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); 111 112 /* 113 * _MAT method - creates an madt apic buffer 114 * apic_id = Arg0 = Local APIC ID 115 * cpu_id = Arg1 = Processor ID 116 * cpu_on = Local0 = CPON flag for this cpu 117 * madt = Local1 = Buffer (in madt apic form) to return 118 */ 119 method = aml_method(CPU_MAT_METHOD, 2, AML_NOTSERIALIZED); 120 aml_append(method, 121 aml_store(aml_derefof(aml_index(cpus_map, apic_id)), cpu_on)); 122 aml_append(method, 123 aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt)); 124 /* Update the processor id, lapic id, and enable/disable status */ 125 aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2)))); 126 aml_append(method, aml_store(apic_id, aml_index(madt, aml_int(3)))); 127 aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4)))); 128 aml_append(method, aml_return(madt)); 129 aml_append(sb_scope, method); 130 131 /* 132 * _STA method - return ON status of cpu 133 * apic_id = Arg0 = Local APIC ID 134 * cpu_on = Local0 = CPON flag for this cpu 135 */ 136 method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED); 137 aml_append(method, 138 aml_store(aml_derefof(aml_index(cpus_map, apic_id)), cpu_on)); 139 if_ctx = aml_if(cpu_on); 140 { 141 aml_append(if_ctx, aml_return(aml_int(0xF))); 142 } 143 aml_append(method, if_ctx); 144 else_ctx = aml_else(); 145 { 146 aml_append(else_ctx, aml_return(zero)); 147 } 148 aml_append(method, else_ctx); 149 aml_append(sb_scope, method); 150 151 method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED); 152 aml_append(method, aml_sleep(200)); 153 aml_append(sb_scope, method); 154 155 method = aml_method(CPU_SCAN_METHOD, 0, AML_NOTSERIALIZED); 156 { 157 Aml *while_ctx, *if_ctx2, *else_ctx2; 158 Aml *bus_check_evt = aml_int(1); 159 Aml *remove_evt = aml_int(3); 160 Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */ 161 Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */ 162 Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */ 163 Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */ 164 Aml *status = aml_local(3); /* Local3 = active state for cpu */ 165 166 aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map)); 167 aml_append(method, aml_store(zero, byte)); 168 aml_append(method, aml_store(zero, idx)); 169 170 /* While (idx < SizeOf(CPON)) */ 171 while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map))); 172 aml_append(while_ctx, 173 aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on)); 174 175 if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL)); 176 { 177 /* Shift down previously read bitmap byte */ 178 aml_append(if_ctx, aml_shiftright(byte, one, byte)); 179 } 180 aml_append(while_ctx, if_ctx); 181 182 else_ctx = aml_else(); 183 { 184 /* Read next byte from cpu bitmap */ 185 aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map, 186 aml_shiftright(idx, aml_int(3), NULL))), byte)); 187 } 188 aml_append(while_ctx, else_ctx); 189 190 aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status)); 191 if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status))); 192 { 193 /* State change - update CPON with new state */ 194 aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx))); 195 if_ctx2 = aml_if(aml_equal(status, one)); 196 { 197 aml_append(if_ctx2, 198 aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt)); 199 } 200 aml_append(if_ctx, if_ctx2); 201 else_ctx2 = aml_else(); 202 { 203 aml_append(else_ctx2, 204 aml_call2(AML_NOTIFY_METHOD, idx, remove_evt)); 205 } 206 } 207 aml_append(if_ctx, else_ctx2); 208 aml_append(while_ctx, if_ctx); 209 210 aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */ 211 aml_append(method, while_ctx); 212 } 213 aml_append(sb_scope, method); 214 215 /* The current AML generator can cover the APIC ID range [0..255], 216 * inclusive, for VCPU hotplug. */ 217 QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256); 218 g_assert(pcms->apic_id_limit <= ACPI_CPU_HOTPLUG_ID_LIMIT); 219 220 /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */ 221 dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE)); 222 aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06"))); 223 aml_append(dev, 224 aml_name_decl("_UID", aml_string("CPU Hotplug resources")) 225 ); 226 /* device present, functioning, decoding, not shown in UI */ 227 aml_append(dev, aml_name_decl("_STA", aml_int(0xB))); 228 crs = aml_resource_template(); 229 aml_append(crs, 230 aml_io(AML_DECODE16, io_base, io_base, 1, ACPI_GPE_PROC_LEN) 231 ); 232 aml_append(dev, aml_name_decl("_CRS", crs)); 233 aml_append(sb_scope, dev); 234 /* declare CPU hotplug MMIO region and PRS field to access it */ 235 aml_append(sb_scope, aml_operation_region( 236 "PRST", AML_SYSTEM_IO, aml_int(io_base), ACPI_GPE_PROC_LEN)); 237 field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE); 238 aml_append(field, aml_named_field("PRS", 256)); 239 aml_append(sb_scope, field); 240 241 /* build Processor object for each processor */ 242 for (i = 0; i < apic_ids->len; i++) { 243 int apic_id = apic_ids->cpus[i].arch_id; 244 245 assert(apic_id < ACPI_CPU_HOTPLUG_ID_LIMIT); 246 247 dev = aml_processor(i, 0, 0, "CP%.02X", apic_id); 248 249 method = aml_method("_MAT", 0, AML_NOTSERIALIZED); 250 aml_append(method, 251 aml_return(aml_call2(CPU_MAT_METHOD, aml_int(apic_id), aml_int(i)) 252 )); 253 aml_append(dev, method); 254 255 method = aml_method("_STA", 0, AML_NOTSERIALIZED); 256 aml_append(method, 257 aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(apic_id)))); 258 aml_append(dev, method); 259 260 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED); 261 aml_append(method, 262 aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(apic_id), 263 aml_arg(0))) 264 ); 265 aml_append(dev, method); 266 267 aml_append(sb_scope, dev); 268 } 269 270 /* build this code: 271 * Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...} 272 */ 273 /* Arg0 = APIC ID */ 274 method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED); 275 for (i = 0; i < apic_ids->len; i++) { 276 int apic_id = apic_ids->cpus[i].arch_id; 277 278 if_ctx = aml_if(aml_equal(aml_arg(0), aml_int(apic_id))); 279 aml_append(if_ctx, 280 aml_notify(aml_name("CP%.02X", apic_id), aml_arg(1)) 281 ); 282 aml_append(method, if_ctx); 283 } 284 aml_append(sb_scope, method); 285 286 /* build "Name(CPON, Package() { One, One, ..., Zero, Zero, ... })" 287 * 288 * Note: The ability to create variable-sized packages was first 289 * introduced in ACPI 2.0. ACPI 1.0 only allowed fixed-size packages 290 * ith up to 255 elements. Windows guests up to win2k8 fail when 291 * VarPackageOp is used. 292 */ 293 pkg = pcms->apic_id_limit <= 255 ? aml_package(pcms->apic_id_limit) : 294 aml_varpackage(pcms->apic_id_limit); 295 296 for (i = 0, apic_idx = 0; i < apic_ids->len; i++) { 297 int apic_id = apic_ids->cpus[i].arch_id; 298 299 for (; apic_idx < apic_id; apic_idx++) { 300 aml_append(pkg, aml_int(0)); 301 } 302 aml_append(pkg, aml_int(apic_ids->cpus[i].cpu ? 1 : 0)); 303 apic_idx = apic_id + 1; 304 } 305 aml_append(sb_scope, aml_name_decl(CPU_ON_BITMAP, pkg)); 306 g_free(apic_ids); 307 308 aml_append(ctx, sb_scope); 309 310 method = aml_method("\\_GPE._E02", 0, AML_NOTSERIALIZED); 311 aml_append(method, aml_call0("\\_SB." CPU_SCAN_METHOD)); 312 aml_append(ctx, method); 313 } 314