58 lines
2.5 KiB
Diff
58 lines
2.5 KiB
Diff
From 38d9ae59b9344f13198e6b4de03b04787bd6b89d Mon Sep 17 00:00:00 2001
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From: Yanan Wang <wangyanan55@huawei.com>
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Date: Fri, 7 Jan 2022 16:32:28 +0800
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Subject: [PATCH 16/24] hw/arm/virt: Support cluster level in DT cpu-map
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Support one cluster level between core and physical package in the
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cpu-map of Arm/virt devicetree. This is also consistent with Linux
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Doc "Documentation/devicetree/bindings/cpu/cpu-topology.txt".
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Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
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Reviewed-by: Andrew Jones <drjones@redhat.com>
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Message-id: 20220107083232.16256-3-wangyanan55@huawei.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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---
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hw/arm/virt.c | 15 ++++++++-------
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1 file changed, 8 insertions(+), 7 deletions(-)
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diff --git a/hw/arm/virt.c b/hw/arm/virt.c
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index 6ca9cbe2cf..ddcb73f714 100644
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--- a/hw/arm/virt.c
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+++ b/hw/arm/virt.c
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@@ -434,9 +434,8 @@ static void fdt_add_cpu_nodes(const VirtMachineState *vms)
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* can contain several layers of clustering within a single physical
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* package and cluster nodes can be contained in parent cluster nodes.
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*
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- * Given that cluster is not yet supported in the vCPU topology,
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- * we currently generate one cluster node within each socket node
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- * by default.
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+ * Note: currently we only support one layer of clustering within
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+ * each physical package.
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*/
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qemu_fdt_add_subnode(ms->fdt, "/cpus/cpu-map");
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@@ -446,14 +445,16 @@ static void fdt_add_cpu_nodes(const VirtMachineState *vms)
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if (ms->smp.threads > 1) {
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map_path = g_strdup_printf(
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- "/cpus/cpu-map/socket%d/cluster0/core%d/thread%d",
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- cpu / (ms->smp.cores * ms->smp.threads),
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+ "/cpus/cpu-map/socket%d/cluster%d/core%d/thread%d",
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+ cpu / (ms->smp.clusters * ms->smp.cores * ms->smp.threads),
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+ (cpu / (ms->smp.cores * ms->smp.threads)) % ms->smp.clusters,
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(cpu / ms->smp.threads) % ms->smp.cores,
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cpu % ms->smp.threads);
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} else {
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map_path = g_strdup_printf(
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- "/cpus/cpu-map/socket%d/cluster0/core%d",
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- cpu / ms->smp.cores,
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+ "/cpus/cpu-map/socket%d/cluster%d/core%d",
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+ cpu / (ms->smp.clusters * ms->smp.cores),
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+ (cpu / ms->smp.cores) % ms->smp.clusters,
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cpu % ms->smp.cores);
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}
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qemu_fdt_add_path(ms->fdt, map_path);
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--
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2.27.0
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