From: Atish Patra <atish.patra@wdc.com>
To: linux-kernel@vger.kernel.org
Cc: Atish Patra <atish.patra@wdc.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Anup Patel <anup@brainfault.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
devicetree@vger.kernel.org,
Dmitriy Cherkasov <dmitriy@oss-tech.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ingo Molnar <mingo@kernel.org>,
Jeremy Linton <jeremy.linton@arm.com>,
Juri Lelli <juri.lelli@arm.com>,
linux-arm-kernel@lists.infradead.org (moderated list:ARM64 PORT
(AARCH64 ARCHITECTURE)),
linux-riscv@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Palmer Dabbelt <palmer@sifive.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will.deacon@arm.com>
Subject: [RFT PATCH v1 4/4] RISC-V: Parse cpu topology during boot.
Date: Thu, 29 Nov 2018 15:28:20 -0800 [thread overview]
Message-ID: <1543534100-3654-5-git-send-email-atish.patra@wdc.com> (raw)
In-Reply-To: <1543534100-3654-1-git-send-email-atish.patra@wdc.com>
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: Atish Patra <atish.patra@wdc.com>
---
arch/riscv/Kconfig | 1 +
arch/riscv/kernel/smpboot.c | 3 +++
2 files changed, 4 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 55da93f4..b0b1fe1a 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -42,6 +42,7 @@ config RISCV
select THREAD_INFO_IN_TASK
select RISCV_TIMER
select GENERIC_IRQ_MULTI_HANDLER
+ select GENERIC_ARCH_TOPOLOGY if SMP
select ARCH_HAS_PTE_SPECIAL
config MMU
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 18cda0e8..5f435af7 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -16,6 +16,7 @@
* GNU General Public License for more details.
*/
+#include <linux/arch_topology.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -42,6 +43,7 @@ void *__cpu_up_task_pointer[NR_CPUS];
void __init smp_prepare_boot_cpu(void)
{
+ init_cpu_topology();
}
void __init smp_prepare_cpus(unsigned int max_cpus)
@@ -115,6 +117,7 @@ asmlinkage void __init smp_callin(void)
trap_init();
notify_cpu_starting(smp_processor_id());
+ update_siblings_masks(smp_processor_id());
set_cpu_online(smp_processor_id(), 1);
/*
* Remote TLB flushes are ignored while the CPU is offline, so emit
--
2.7.4
next prev parent reply other threads:[~2018-11-29 23:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-29 23:28 [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V Atish Patra
2018-11-29 23:28 ` [RFT PATCH v1 1/4] Documentation: DT: arm: add support for sockets defining package boundaries Atish Patra
2018-12-03 16:46 ` Sudeep Holla
2018-12-12 2:18 ` Rob Herring
2018-11-29 23:28 ` [RFT PATCH v1 2/4] dt-binding: cpu-topology: Move cpu-map to a common binding Atish Patra
2018-12-03 16:55 ` Sudeep Holla
2018-12-03 17:23 ` Atish Patra
2018-12-03 17:33 ` Sudeep Holla
2018-12-03 17:40 ` Atish Patra
2018-12-12 2:21 ` Rob Herring
2018-12-12 2:31 ` Rob Herring
2018-12-12 18:23 ` Atish Patra
2018-11-29 23:28 ` [RFT PATCH v1 3/4] cpu-topology: Move cpu topology code to common code Atish Patra
2018-12-03 16:58 ` Will Deacon
2018-12-03 17:12 ` Sudeep Holla
2018-12-04 9:50 ` Juri Lelli
2018-12-03 17:16 ` Sudeep Holla
2018-12-03 17:31 ` Atish Patra
2018-11-29 23:28 ` Atish Patra [this message]
2018-12-03 16:59 ` [RFT PATCH v1 4/4] RISC-V: Parse cpu topology during boot Sudeep Holla
2018-12-05 17:53 ` [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V Jeffrey Hugo
2018-12-11 0:26 ` Atish Patra
2018-12-07 13:45 ` Morten Rasmussen
2018-12-07 15:04 ` Sudeep Holla
2018-12-11 0:11 ` Atish Patra
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