From: Rob Herring <robh+dt@kernel.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: Atish Patra <atishp@atishpatra.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-riscv <linux-riscv@lists.infradead.org>
Subject: Re: [PATCH v2 8/8] arch_topology: Add support to build llc_sibling on DT platforms
Date: Thu, 19 May 2022 13:10:51 -0500 [thread overview]
Message-ID: <CAL_JsqKig8U4hQEtHW8ct1Pd0a29ZtoTp1HuWQv389yb+SuW_A@mail.gmail.com> (raw)
In-Reply-To: <20220518093325.2070336-9-sudeep.holla@arm.com>
On Wed, May 18, 2022 at 4:34 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> ACPI PPTT provides cache identifiers and especially the last level cache
> identifier is used in obtaining last level cache siblings amongst CPUs.
>
> While we have the cpu map representing all the CPUs sharing last level
> cache in the cacheinfo driver, it is populated quite late in the boot
> while the information is needed to build scheduler domains quite early.
Late is because it's a device_initcall() rather than late in the cpu
hotplug state machine, right? The late aspect is for sysfs presumably,
but I think we could decouple that. Do all the firmware cache parsing
early and then populate the sysfs parts later. It's not a unique
problem as the DT unflattening and init code has to do the same thing.
I'd assume the hotplug and cpu sysfs devices have to deal with the
same thing.
Rob
WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh+dt@kernel.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: Atish Patra <atishp@atishpatra.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-riscv <linux-riscv@lists.infradead.org>
Subject: Re: [PATCH v2 8/8] arch_topology: Add support to build llc_sibling on DT platforms
Date: Thu, 19 May 2022 13:10:51 -0500 [thread overview]
Message-ID: <CAL_JsqKig8U4hQEtHW8ct1Pd0a29ZtoTp1HuWQv389yb+SuW_A@mail.gmail.com> (raw)
In-Reply-To: <20220518093325.2070336-9-sudeep.holla@arm.com>
On Wed, May 18, 2022 at 4:34 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> ACPI PPTT provides cache identifiers and especially the last level cache
> identifier is used in obtaining last level cache siblings amongst CPUs.
>
> While we have the cpu map representing all the CPUs sharing last level
> cache in the cacheinfo driver, it is populated quite late in the boot
> while the information is needed to build scheduler domains quite early.
Late is because it's a device_initcall() rather than late in the cpu
hotplug state machine, right? The late aspect is for sysfs presumably,
but I think we could decouple that. Do all the firmware cache parsing
early and then populate the sysfs parts later. It's not a unique
problem as the DT unflattening and init code has to do the same thing.
I'd assume the hotplug and cpu sysfs devices have to deal with the
same thing.
Rob
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh+dt@kernel.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: Atish Patra <atishp@atishpatra.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-riscv <linux-riscv@lists.infradead.org>
Subject: Re: [PATCH v2 8/8] arch_topology: Add support to build llc_sibling on DT platforms
Date: Thu, 19 May 2022 13:10:51 -0500 [thread overview]
Message-ID: <CAL_JsqKig8U4hQEtHW8ct1Pd0a29ZtoTp1HuWQv389yb+SuW_A@mail.gmail.com> (raw)
In-Reply-To: <20220518093325.2070336-9-sudeep.holla@arm.com>
On Wed, May 18, 2022 at 4:34 AM Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> ACPI PPTT provides cache identifiers and especially the last level cache
> identifier is used in obtaining last level cache siblings amongst CPUs.
>
> While we have the cpu map representing all the CPUs sharing last level
> cache in the cacheinfo driver, it is populated quite late in the boot
> while the information is needed to build scheduler domains quite early.
Late is because it's a device_initcall() rather than late in the cpu
hotplug state machine, right? The late aspect is for sysfs presumably,
but I think we could decouple that. Do all the firmware cache parsing
early and then populate the sysfs parts later. It's not a unique
problem as the DT unflattening and init code has to do the same thing.
I'd assume the hotplug and cpu sysfs devices have to deal with the
same thing.
Rob
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-19 18:11 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 9:33 [PATCH v2 0/8] arch_topology: Updates to add socket support and fix cluster ids Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 1/8] arch_topology: Don't set cluster identifier as physical package identifier Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-20 12:31 ` Dietmar Eggemann
2022-05-20 12:31 ` Dietmar Eggemann
2022-05-20 12:31 ` Dietmar Eggemann
2022-05-20 13:13 ` Sudeep Holla
2022-05-20 13:13 ` Sudeep Holla
2022-05-20 13:13 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 2/8] arch_topology: Set thread sibling cpumask only within the cluster Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-20 12:32 ` Dietmar Eggemann
2022-05-20 12:32 ` Dietmar Eggemann
2022-05-20 12:32 ` Dietmar Eggemann
2022-05-20 13:20 ` Sudeep Holla
2022-05-20 13:20 ` Sudeep Holla
2022-05-20 13:20 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 3/8] arch_topology: Set cluster identifier in each core/thread from /cpu-map Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-19 16:55 ` Ionela Voinescu
2022-05-19 16:55 ` Ionela Voinescu
2022-05-19 16:55 ` Ionela Voinescu
2022-05-20 12:33 ` Dietmar Eggemann
2022-05-20 12:33 ` Dietmar Eggemann
2022-05-20 12:33 ` Dietmar Eggemann
2022-05-20 13:54 ` Sudeep Holla
2022-05-20 13:54 ` Sudeep Holla
2022-05-20 13:54 ` Sudeep Holla
2022-05-20 15:27 ` Sudeep Holla
2022-05-20 15:27 ` Sudeep Holla
2022-05-20 15:27 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 4/8] arch_topology: Add support for parsing sockets in /cpu-map Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 5/8] arch_topology: Check for non-negative value rather than -1 for IDs validity Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 6/8] arch_topology: Avoid parsing through all the CPUs once a outlier CPU is found Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 7/8] of: base: add support to get the device node for the CPU's last level cache Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` [PATCH v2 8/8] arch_topology: Add support to build llc_sibling on DT platforms Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-18 9:33 ` Sudeep Holla
2022-05-19 18:10 ` Rob Herring [this message]
2022-05-19 18:10 ` Rob Herring
2022-05-19 18:10 ` Rob Herring
2022-05-20 12:59 ` Sudeep Holla
2022-05-20 12:59 ` Sudeep Holla
2022-05-20 12:59 ` Sudeep Holla
2022-05-20 14:36 ` Rob Herring
2022-05-20 14:36 ` Rob Herring
2022-05-20 14:36 ` Rob Herring
2022-05-20 15:06 ` Sudeep Holla
2022-05-20 15:06 ` Sudeep Holla
2022-05-20 15:06 ` Sudeep Holla
2022-05-20 12:33 ` Dietmar Eggemann
2022-05-20 12:33 ` Dietmar Eggemann
2022-05-20 12:33 ` Dietmar Eggemann
2022-05-20 14:56 ` Sudeep Holla
2022-05-20 14:56 ` Sudeep Holla
2022-05-20 14:56 ` Sudeep Holla
2022-05-19 16:32 ` [PATCH v2 0/8] arch_topology: Updates to add socket support and fix cluster ids Ionela Voinescu
2022-05-19 16:32 ` Ionela Voinescu
2022-05-19 16:32 ` Ionela Voinescu
2022-05-20 15:33 ` Sudeep Holla
2022-05-20 15:33 ` Sudeep Holla
2022-05-20 15:33 ` Sudeep Holla
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