@@ -28,6 +28,37 @@ The ``qemu-system-loongarch64`` provides emulation for virt
machine. You can specify the machine type ``virt`` and
cpu type ``la464``.
+CPU Topology
+------------
+
+The ``LA464`` type CPUs have the concept of Socket Core and Thread.
+
+For example:
+
+``-smp 1,maxcpus=M,sockets=S,cores=C,threads=T``
+
+The above parameters indicate that the machine has a maximum of ``M`` vCPUs and
+``S`` sockets, each socket has ``C`` cores, each core has ``T`` threads,
+and each thread corresponds to a vCPU.
+
+Then ``M`` ``S`` ``C`` ``T`` has the following relationship:
+
+``M = S * C * T``
+
+In the CPU topology relationship, When we know the ``socket_id`` ``core_id``
+and ``thread_id`` of the CPU, we can calculate its ``arch_id``:
+
+``arch_id = (socket_id * S) + (core_id * C) + (thread_id * T)``
+
+Similarly, when we know the ``arch_id`` of the CPU,
+we can also get its ``socket_id`` ``core_id`` and ``thread_id``:
+
+``socket_id = arch_id / (C * T)``
+
+``core_id = (arch_id / T) % C``
+
+``thread_id = arch_id % T``
+
Boot options
------------
@@ -1143,9 +1143,7 @@ static void virt_init(MachineState *machine)
LoongArchVirtMachineState *lvms = LOONGARCH_VIRT_MACHINE(machine);
int i;
hwaddr base, size, ram_size = machine->ram_size;
- const CPUArchIdList *possible_cpus;
MachineClass *mc = MACHINE_GET_CLASS(machine);
- CPUState *cpu;
if (!cpu_model) {
cpu_model = LOONGARCH_CPU_TYPE_NAME("la464");
@@ -1163,14 +1161,39 @@ static void virt_init(MachineState *machine)
memory_region_add_subregion(&lvms->system_iocsr, 0, &lvms->iocsr_mem);
/* Init CPUs */
- possible_cpus = mc->possible_cpu_arch_ids(machine);
- for (i = 0; i < possible_cpus->len; i++) {
- cpu = cpu_create(machine->cpu_type);
- cpu->cpu_index = i;
- machine->possible_cpus->cpus[i].cpu = cpu;
- lacpu = LOONGARCH_CPU(cpu);
+ mc->possible_cpu_arch_ids(machine);
+ for (i = 0; i < machine->smp.cpus; i++) {
+ Object *cpuobj;
+ cpuobj = object_new(machine->cpu_type);
+ lacpu = LOONGARCH_CPU(cpuobj);
+
lacpu->phy_id = machine->possible_cpus->cpus[i].arch_id;
+ object_property_set_int(cpuobj, "socket-id",
+ machine->possible_cpus->cpus[i].props.socket_id,
+ NULL);
+ object_property_set_int(cpuobj, "core-id",
+ machine->possible_cpus->cpus[i].props.core_id,
+ NULL);
+ object_property_set_int(cpuobj, "thread-id",
+ machine->possible_cpus->cpus[i].props.thread_id,
+ NULL);
+ /*
+ * The CPU in place at the time of machine startup will also enter
+ * the CPU hot-plug process when it is created, but at this time,
+ * the GED device has not been created, resulting in exit in the CPU
+ * hot-plug process, which can avoid the incumbent CPU repeatedly
+ * applying for resources.
+ *
+ * The interrupt resource of the in-place CPU will be requested at
+ * the current function call loongarch_irq_init().
+ *
+ * The interrupt resource of the subsequently inserted CPU will be
+ * requested in the CPU hot-plug process.
+ */
+ qdev_realize(DEVICE(cpuobj), NULL, &error_fatal);
+ object_unref(cpuobj);
}
+
fdt_add_cpu_nodes(lvms);
fdt_add_memory_nodes(machine);
fw_cfg_add_memory(machine);
@@ -1286,6 +1309,27 @@ static void virt_initfn(Object *obj)
virt_flash_create(lvms);
}
+static int virt_get_arch_id_from_topo(MachineState *ms, LoongArchCPUTopo *topo)
+{
+ int arch_id, sock_vcpu_num, core_vcpu_num;
+
+ /*
+ * calculate total logical cpus across socket/core/thread.
+ * For more information on how to calculate the arch_id,
+ * you can refer to the CPU Topology chapter of the
+ * docs/system/loongarch/virt.rst document.
+ */
+ sock_vcpu_num = topo->socket_id * (ms->smp.threads * ms->smp.cores);
+ core_vcpu_num = topo->core_id * ms->smp.threads;
+
+ /* get vcpu-id(logical cpu index) for this vcpu from this topology */
+ arch_id = (sock_vcpu_num + core_vcpu_num) + topo->thread_id;
+
+ assert(arch_id >= 0 && arch_id < ms->possible_cpus->len);
+
+ return arch_id;
+}
+
static bool memhp_type_supported(DeviceState *dev)
{
/* we only support pc dimm now */
@@ -1383,10 +1427,19 @@ static HotplugHandler *virt_get_hotplug_handler(MachineState *machine,
return NULL;
}
+static void virt_get_cpu_topo_from_index(MachineState *ms,
+ LoongArchCPUTopo *topo, int index)
+{
+ topo->socket_id = index / (ms->smp.cores * ms->smp.threads);
+ topo->core_id = index / ms->smp.threads % ms->smp.cores;
+ topo->thread_id = index % ms->smp.threads;
+}
+
static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
{
int n;
unsigned int max_cpus = ms->smp.max_cpus;
+ LoongArchCPUTopo topo;
if (ms->possible_cpus) {
assert(ms->possible_cpus->len == max_cpus);
@@ -1397,17 +1450,18 @@ static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
sizeof(CPUArchId) * max_cpus);
ms->possible_cpus->len = max_cpus;
for (n = 0; n < ms->possible_cpus->len; n++) {
+ ms->possible_cpus->cpus[n].vcpus_count = ms->smp.threads;
ms->possible_cpus->cpus[n].type = ms->cpu_type;
- ms->possible_cpus->cpus[n].arch_id = n;
+ virt_get_cpu_topo_from_index(ms, &topo, n);
ms->possible_cpus->cpus[n].props.has_socket_id = true;
- ms->possible_cpus->cpus[n].props.socket_id =
- n / (ms->smp.cores * ms->smp.threads);
+ ms->possible_cpus->cpus[n].props.socket_id = topo.socket_id;
ms->possible_cpus->cpus[n].props.has_core_id = true;
- ms->possible_cpus->cpus[n].props.core_id =
- n / ms->smp.threads % ms->smp.cores;
+ ms->possible_cpus->cpus[n].props.core_id = topo.core_id;
ms->possible_cpus->cpus[n].props.has_thread_id = true;
- ms->possible_cpus->cpus[n].props.thread_id = n % ms->smp.threads;
+ ms->possible_cpus->cpus[n].props.thread_id = topo.thread_id;
+ ms->possible_cpus->cpus[n].arch_id =
+ virt_get_arch_id_from_topo(ms, &topo);
}
return ms->possible_cpus;
}
@@ -16,6 +16,7 @@
#include "kvm/kvm_loongarch.h"
#include "exec/exec-all.h"
#include "cpu.h"
+#include "hw/qdev-properties.h"
#include "internals.h"
#include "fpu/softfloat-helpers.h"
#include "cpu-csr.h"
@@ -780,6 +781,15 @@ static int64_t loongarch_cpu_get_arch_id(CPUState *cs)
}
#endif
+static Property loongarch_cpu_properties[] = {
+ DEFINE_PROP_INT32("socket-id", LoongArchCPU, socket_id, 0),
+ DEFINE_PROP_INT32("core-id", LoongArchCPU, core_id, 0),
+ DEFINE_PROP_INT32("thread-id", LoongArchCPU, thread_id, 0),
+ DEFINE_PROP_INT32("node-id", LoongArchCPU, node_id, CPU_UNSET_NUMA_NODE_ID),
+
+ DEFINE_PROP_END_OF_LIST()
+};
+
static void loongarch_cpu_class_init(ObjectClass *c, void *data)
{
LoongArchCPUClass *lacc = LOONGARCH_CPU_CLASS(c);
@@ -787,6 +797,7 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
DeviceClass *dc = DEVICE_CLASS(c);
ResettableClass *rc = RESETTABLE_CLASS(c);
+ device_class_set_props(dc, loongarch_cpu_properties);
device_class_set_parent_realize(dc, loongarch_cpu_realizefn,
&lacc->parent_realize);
resettable_class_set_parent_phases(rc, NULL, loongarch_cpu_reset_hold, NULL,
@@ -811,6 +822,7 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
#ifdef CONFIG_TCG
cc->tcg_ops = &loongarch_tcg_ops;
#endif
+ dc->user_creatable = true;
}
static const gchar *loongarch32_gdb_arch_name(CPUState *cs)
@@ -369,6 +369,12 @@ typedef struct CPUArchState {
#endif
} CPULoongArchState;
+typedef struct LoongArchCPUTopo {
+ int32_t socket_id; /* socket-id of this VCPU */
+ int32_t core_id; /* core-id of this VCPU */
+ int32_t thread_id; /* thread-id of this VCPU */
+} LoongArchCPUTopo;
+
/**
* LoongArchCPU:
* @env: #CPULoongArchState
@@ -381,6 +387,10 @@ struct ArchCPU {
CPULoongArchState env;
QEMUTimer timer;
uint32_t phy_id;
+ int32_t socket_id; /* socket-id of this VCPU */
+ int32_t core_id; /* core-id of this VCPU */
+ int32_t thread_id; /* thread-id of this VCPU */
+ int32_t node_id; /* NUMA node this CPU belongs to */
/* 'compatible' string for this CPU for Linux device trees */
const char *dtb_compatible;
@@ -399,6 +409,7 @@ struct LoongArchCPUClass {
CPUClass parent_class;
DeviceRealize parent_realize;
+ DeviceUnrealize parent_unrealize;
ResettablePhases parent_phases;
};
Add topological relationships for Loongarch VCPU and initialize topology member variables. Also physical cpu id calculation method comes from its topo information. Co-developed-by: Xianglai Li <lixianglai@loongson.cn> Signed-off-by: Bibo Mao <maobibo@loongson.cn> --- docs/system/loongarch/virt.rst | 31 +++++++++++++ hw/loongarch/virt.c | 82 ++++++++++++++++++++++++++++------ target/loongarch/cpu.c | 12 +++++ target/loongarch/cpu.h | 11 +++++ 4 files changed, 122 insertions(+), 14 deletions(-)