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Commit 03f11f03 authored by Atish Patra's avatar Atish Patra Committed by Paul Walmsley
Browse files

RISC-V: Parse cpu topology during boot. 



Currently, there are no topology defined for RISC-V.
Parse the cpu-map node from device tree and setup the
cpu topology.

CPU topology after applying the patch.
$cat /sys/devices/system/cpu/cpu2/topology/core_siblings_list
0-3
$cat /sys/devices/system/cpu/cpu3/topology/core_siblings_list
0-3
$cat /sys/devices/system/cpu/cpu3/topology/physical_package_id
0
$cat /sys/devices/system/cpu/cpu3/topology/core_id
3

Signed-off-by: default avatarAtish Patra <atish.patra@wdc.com>
Acked-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarPaul Walmsley <paul.walmsley@sifive.com>
parent ca74b316

arch/riscv/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -48,6 +48,7 @@ config RISCV 
	select PCI_MSI if PCI

	select PCI_MSI if PCI

	select RISCV_TIMER

	select RISCV_TIMER

	select GENERIC_IRQ_MULTI_HANDLER

	select GENERIC_IRQ_MULTI_HANDLER

	select GENERIC_ARCH_TOPOLOGY if SMP

	select ARCH_HAS_PTE_SPECIAL

	select ARCH_HAS_PTE_SPECIAL

	select ARCH_HAS_MMIOWB

	select ARCH_HAS_MMIOWB

	select HAVE_EBPF_JIT if 64BIT

	select HAVE_EBPF_JIT if 64BIT

arch/riscv/kernel/smpboot.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -8,6 +8,7 @@ 
 * Copyright (C) 2017 SiFive

 * Copyright (C) 2017 SiFive

 */

 */





#include <linux/arch_topology.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/kernel.h>
@@ -35,6 +36,7 @@ static DECLARE_COMPLETION(cpu_running); 




void __init smp_prepare_boot_cpu(void)

void __init smp_prepare_boot_cpu(void)

{

{

	init_cpu_topology();

}

}





void __init smp_prepare_cpus(unsigned int max_cpus)

void __init smp_prepare_cpus(unsigned int max_cpus)
@@ -138,6 +140,7 @@ asmlinkage void __init smp_callin(void) 




	trap_init();

	trap_init();

	notify_cpu_starting(smp_processor_id());

	notify_cpu_starting(smp_processor_id());

	update_siblings_masks(smp_processor_id());

	set_cpu_online(smp_processor_id(), 1);

	set_cpu_online(smp_processor_id(), 1);

	/*

	/*

	 * Remote TLB flushes are ignored while the CPU is offline, so emit

	 * Remote TLB flushes are ignored while the CPU is offline, so emit