7c2991fa11
move the former SSDT part of CPU hoplug close to DSDT part. AML is only moved but there isn't any functional change. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
239 lines
8.8 KiB
C
239 lines
8.8 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "hw/acpi/cpu_hotplug.h"
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#include "hw/i386/pc.h"
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void build_cpu_hotplug_aml(Aml *ctx, MachineState *machine,
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uint16_t io_base, uint16_t io_len)
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{
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Aml *dev;
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Aml *crs;
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Aml *pkg;
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Aml *field;
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Aml *method;
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Aml *if_ctx;
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Aml *else_ctx;
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int i, apic_idx;
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Aml *sb_scope = aml_scope("_SB");
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uint8_t madt_tmpl[8] = {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0};
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Aml *cpu_id = aml_arg(0);
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Aml *cpu_on = aml_local(0);
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Aml *madt = aml_local(1);
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Aml *cpus_map = aml_name(CPU_ON_BITMAP);
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Aml *zero = aml_int(0);
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Aml *one = aml_int(1);
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MachineClass *mc = MACHINE_GET_CLASS(machine);
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CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(machine);
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PCMachineState *pcms = PC_MACHINE(machine);
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/*
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* _MAT method - creates an madt apic buffer
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* cpu_id = Arg0 = Processor ID = Local APIC ID
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* cpu_on = Local0 = CPON flag for this cpu
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* madt = Local1 = Buffer (in madt apic form) to return
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*/
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method = aml_method(CPU_MAT_METHOD, 1, AML_NOTSERIALIZED);
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aml_append(method,
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aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
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aml_append(method,
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aml_store(aml_buffer(sizeof(madt_tmpl), madt_tmpl), madt));
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/* Update the processor id, lapic id, and enable/disable status */
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aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(2))));
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aml_append(method, aml_store(cpu_id, aml_index(madt, aml_int(3))));
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aml_append(method, aml_store(cpu_on, aml_index(madt, aml_int(4))));
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aml_append(method, aml_return(madt));
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aml_append(sb_scope, method);
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/*
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* _STA method - return ON status of cpu
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* cpu_id = Arg0 = Processor ID = Local APIC ID
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* cpu_on = Local0 = CPON flag for this cpu
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*/
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method = aml_method(CPU_STATUS_METHOD, 1, AML_NOTSERIALIZED);
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aml_append(method,
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aml_store(aml_derefof(aml_index(cpus_map, cpu_id)), cpu_on));
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if_ctx = aml_if(cpu_on);
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{
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aml_append(if_ctx, aml_return(aml_int(0xF)));
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}
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aml_append(method, if_ctx);
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else_ctx = aml_else();
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{
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aml_append(else_ctx, aml_return(zero));
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}
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aml_append(method, else_ctx);
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aml_append(sb_scope, method);
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method = aml_method(CPU_EJECT_METHOD, 2, AML_NOTSERIALIZED);
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aml_append(method, aml_sleep(200));
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aml_append(sb_scope, method);
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method = aml_method(CPU_SCAN_METHOD, 0, AML_NOTSERIALIZED);
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{
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Aml *while_ctx, *if_ctx2, *else_ctx2;
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Aml *bus_check_evt = aml_int(1);
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Aml *remove_evt = aml_int(3);
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Aml *status_map = aml_local(5); /* Local5 = active cpu bitmap */
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Aml *byte = aml_local(2); /* Local2 = last read byte from bitmap */
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Aml *idx = aml_local(0); /* Processor ID / APIC ID iterator */
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Aml *is_cpu_on = aml_local(1); /* Local1 = CPON flag for cpu */
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Aml *status = aml_local(3); /* Local3 = active state for cpu */
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aml_append(method, aml_store(aml_name(CPU_STATUS_MAP), status_map));
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aml_append(method, aml_store(zero, byte));
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aml_append(method, aml_store(zero, idx));
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/* While (idx < SizeOf(CPON)) */
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while_ctx = aml_while(aml_lless(idx, aml_sizeof(cpus_map)));
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aml_append(while_ctx,
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aml_store(aml_derefof(aml_index(cpus_map, idx)), is_cpu_on));
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if_ctx = aml_if(aml_and(idx, aml_int(0x07), NULL));
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{
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/* Shift down previously read bitmap byte */
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aml_append(if_ctx, aml_shiftright(byte, one, byte));
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}
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aml_append(while_ctx, if_ctx);
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else_ctx = aml_else();
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{
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/* Read next byte from cpu bitmap */
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aml_append(else_ctx, aml_store(aml_derefof(aml_index(status_map,
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aml_shiftright(idx, aml_int(3), NULL))), byte));
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}
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aml_append(while_ctx, else_ctx);
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aml_append(while_ctx, aml_store(aml_and(byte, one, NULL), status));
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if_ctx = aml_if(aml_lnot(aml_equal(is_cpu_on, status)));
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{
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/* State change - update CPON with new state */
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aml_append(if_ctx, aml_store(status, aml_index(cpus_map, idx)));
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if_ctx2 = aml_if(aml_equal(status, one));
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{
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aml_append(if_ctx2,
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aml_call2(AML_NOTIFY_METHOD, idx, bus_check_evt));
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}
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aml_append(if_ctx, if_ctx2);
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else_ctx2 = aml_else();
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{
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aml_append(else_ctx2,
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aml_call2(AML_NOTIFY_METHOD, idx, remove_evt));
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}
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}
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aml_append(if_ctx, else_ctx2);
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aml_append(while_ctx, if_ctx);
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aml_append(while_ctx, aml_increment(idx)); /* go to next cpu */
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aml_append(method, while_ctx);
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}
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aml_append(sb_scope, method);
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/* The current AML generator can cover the APIC ID range [0..255],
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* inclusive, for VCPU hotplug. */
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QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
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g_assert(pcms->apic_id_limit <= ACPI_CPU_HOTPLUG_ID_LIMIT);
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/* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */
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dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE));
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aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06")));
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aml_append(dev,
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aml_name_decl("_UID", aml_string("CPU Hotplug resources"))
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);
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/* device present, functioning, decoding, not shown in UI */
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aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
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crs = aml_resource_template();
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aml_append(crs,
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aml_io(AML_DECODE16, io_base, io_base, 1, io_len)
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);
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aml_append(dev, aml_name_decl("_CRS", crs));
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aml_append(sb_scope, dev);
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/* declare CPU hotplug MMIO region and PRS field to access it */
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aml_append(sb_scope, aml_operation_region(
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"PRST", AML_SYSTEM_IO, aml_int(io_base), io_len));
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field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
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aml_append(field, aml_named_field("PRS", 256));
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aml_append(sb_scope, field);
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/* build Processor object for each processor */
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for (i = 0; i < apic_ids->len; i++) {
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int apic_id = apic_ids->cpus[i].arch_id;
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assert(apic_id < ACPI_CPU_HOTPLUG_ID_LIMIT);
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dev = aml_processor(apic_id, 0, 0, "CP%.02X", apic_id);
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method = aml_method("_MAT", 0, AML_NOTSERIALIZED);
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aml_append(method,
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aml_return(aml_call1(CPU_MAT_METHOD, aml_int(apic_id))));
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aml_append(dev, method);
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method = aml_method("_STA", 0, AML_NOTSERIALIZED);
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aml_append(method,
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aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(apic_id))));
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aml_append(dev, method);
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method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
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aml_append(method,
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aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(apic_id),
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aml_arg(0)))
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);
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aml_append(dev, method);
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aml_append(sb_scope, dev);
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}
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/* build this code:
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* Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...}
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*/
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/* Arg0 = Processor ID = APIC ID */
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method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
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for (i = 0; i < apic_ids->len; i++) {
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int apic_id = apic_ids->cpus[i].arch_id;
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if_ctx = aml_if(aml_equal(aml_arg(0), aml_int(apic_id)));
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aml_append(if_ctx,
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aml_notify(aml_name("CP%.02X", apic_id), aml_arg(1))
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);
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aml_append(method, if_ctx);
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}
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aml_append(sb_scope, method);
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/* build "Name(CPON, Package() { One, One, ..., Zero, Zero, ... })"
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*
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* Note: The ability to create variable-sized packages was first
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* introduced in ACPI 2.0. ACPI 1.0 only allowed fixed-size packages
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* ith up to 255 elements. Windows guests up to win2k8 fail when
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* VarPackageOp is used.
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*/
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pkg = pcms->apic_id_limit <= 255 ? aml_package(pcms->apic_id_limit) :
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aml_varpackage(pcms->apic_id_limit);
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for (i = 0, apic_idx = 0; i < apic_ids->len; i++) {
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int apic_id = apic_ids->cpus[i].arch_id;
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for (; apic_idx < apic_id; apic_idx++) {
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aml_append(pkg, aml_int(0));
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}
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aml_append(pkg, aml_int(apic_ids->cpus[i].cpu ? 1 : 0));
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apic_idx = apic_id + 1;
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}
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aml_append(sb_scope, aml_name_decl(CPU_ON_BITMAP, pkg));
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g_free(apic_ids);
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aml_append(ctx, sb_scope);
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}
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