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aarch64: Simplify VCPU topology coding in FDT

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In Flattened Device Tree (FDT) on AArch64, the VCPU topology is
represented by `cpu-map` node. The source code of creating the node
can be simplified.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>
This commit is contained in:
Michael Zhao 2022-02-19 16:37:24 +08:00 committed by Xin Wang
parent 0fa31539eb
commit 28d6bff340
1 changed files with 16 additions and 38 deletions
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54
arch/src/aarch64/fdt.rs
View File

@ -161,9 +161,6 @@ fn create_cpu_nodes(
fdt.property_u32("#size-cells", 0x0)?;
let num_cpus = vcpu_mpidr.len();
let threads_per_core = vcpu_topology.unwrap_or_default().0 as u8;
let cores_per_package = vcpu_topology.unwrap_or_default().1 as u8;
let packages = vcpu_topology.unwrap_or_default().2 as u8;
for (cpu_id, mpidr) in vcpu_mpidr.iter().enumerate().take(num_cpus) {
let cpu_name = format!("cpu@{:x}", cpu_id);
@ -192,31 +189,20 @@ fn create_cpu_nodes(
fdt.end_node(cpu_node)?;
}
// If there is a valid cpu topology config, create the cpu-map node.
if (threads_per_core > 0)
&& (cores_per_package > 0)
&& (packages > 0)
&& (num_cpus as u8 == threads_per_core * cores_per_package * packages)
{
if let Some(topology) = vcpu_topology {
let (threads_per_core, cores_per_package, packages) = topology;
let cpu_map_node = fdt.begin_node("cpu-map")?;
// Create mappings between CPU index and cluster,core, and thread.
let mut cluster_core_thread_to_cpuidx = HashMap::new();
for cpu_idx in 0..num_cpus as u8 {
if threads_per_core > 1 {
cluster_core_thread_to_cpuidx.insert(
(
cpu_idx / (cores_per_package * threads_per_core),
(cpu_idx / threads_per_core) % cores_per_package,
cpu_idx % threads_per_core,
),
cpu_idx,
);
} else {
cluster_core_thread_to_cpuidx.insert(
(cpu_idx / cores_per_package, cpu_idx % cores_per_package, 0),
cpu_idx,
);
}
cluster_core_thread_to_cpuidx.insert(
(
cpu_idx / (cores_per_package * threads_per_core),
(cpu_idx / threads_per_core) % cores_per_package,
cpu_idx % threads_per_core,
),
cpu_idx,
);
}
// Create device tree nodes with regard of above mapping.
@ -228,24 +214,16 @@ fn create_cpu_nodes(
let core_name = format!("core{:x}", core_idx);
let core_node = fdt.begin_node(&core_name)?;
if threads_per_core > 1 {
for thread_idx in 0..threads_per_core {
let thread_name = format!("thread{:x}", thread_idx);
let thread_node = fdt.begin_node(&thread_name)?;
let cpu_idx = cluster_core_thread_to_cpuidx
.get(&(cluster_idx, core_idx, thread_idx))
.unwrap();
fdt.property_u32("cpu", *cpu_idx as u32 + FIRST_VCPU_PHANDLE)?;
fdt.end_node(thread_node)?;
}
} else {
for thread_idx in 0..threads_per_core {
let thread_name = format!("thread{:x}", thread_idx);
let thread_node = fdt.begin_node(&thread_name)?;
let cpu_idx = cluster_core_thread_to_cpuidx
.get(&(cluster_idx, core_idx, 0))
.get(&(cluster_idx, core_idx, thread_idx))
.unwrap();
fdt.property_u32("cpu", *cpu_idx as u32 + FIRST_VCPU_PHANDLE)?;
fdt.end_node(thread_node)?;
}
fdt.end_node(core_node)?;
}
fdt.end_node(cluster_node)?;