From: Sudeep Holla <sudeep.holla@arm.com>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: linux-kernel@vger.kernel.org,
Greg KH <gregkh@linuxfoundation.org>,
Atish Patra <atishp@atishpatra.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>, Rob Herring <robh+dt@kernel.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Pierre Gondois <pierre.gondois@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH v4 00/20] arch_topology: Updates to add socket support and fix cluster ids
Date: Mon, 27 Jun 2022 17:22:11 +0100 [thread overview]
Message-ID: <20220627162211.t2dlu2no2turnc6r@bogus> (raw)
In-Reply-To: <Yrm2lG3uskxT26Of@arm.com>
On Mon, Jun 27, 2022 at 02:54:28PM +0100, Ionela Voinescu wrote:
> Hi Sudeep,
>
> On Tuesday 21 Jun 2022 at 20:20:14 (+0100), Sudeep Holla wrote:
> > Hi All,
> >
> > This version updates cacheinfo to populate and use the information from
> > there for all the cache topology.
> >
> > This series intends to fix some discrepancies we have in the CPU topology
> > parsing from the device tree /cpu-map node. Also this diverges from the
> > behaviour on a ACPI enabled platform. The expectation is that both DT
> > and ACPI enabled systems must present consistent view of the CPU topology.
> >
> > Currently we assign generated cluster count as the physical package identifier
> > for each CPU which is wrong. The device tree bindings for CPU topology supports
> > sockets to infer the socket or physical package identifier for a given CPU.
> > Also we don't check if all the cores/threads belong to the same cluster before
> > updating their sibling masks which is fine as we don't set the cluster id yet.
> >
> > These changes also assigns the cluster identifier as parsed from the device tree
> > cluster nodes within /cpu-map without support for nesting of the clusters.
> > Finally, it also add support for socket nodes in /cpu-map. With this the
> > parsing of exact same information from ACPI PPTT and /cpu-map DT node
> > aligns well.
> >
> > The only exception is that the last level cache id information can be
> > inferred from the same ACPI PPTT while we need to parse CPU cache nodes
> > in the device tree.
> >
> > Hi Greg,
> >
> > I had not cc-ed you on earlier 3 versions as we had some disagreement
> > amongst Arm developers which we have not settled. Let me know how you want to
>
> s/not/now :)
>
> > merge this once you agree with the changes. I can set pull request if
> > you prefer. Let me know.
> >
> > v4[3]->v4:
> > - Updated ACPI PPTT fw_token to use table offset instead of virtual
> > address as it could get changed for everytime it is mapped before
> > the global acpi_permanent_mmap is set
> > - Added warning for the topology with nested clusters
> > - Added update to cpu_clustergroup_mask so that introduction of
> > correct cluster_id doesn't break existing platforms by limiting
> > the span of clustergroup_mask(by Ionela)
> >
>
> I've tested v4 on quite a few platforms:
> - DT: Juno R0, DB845c, RB5
> - ACPI: TX2, Ampere Altra, Kunpeng920
>
> and it all looks good from my point of view (topology and sched domain
> hierarchy).
>
> So for the full set (after the changes requested for 16/20 and 20/20):
>
> Tested-by: Ionela Voinescu <ionela.voinescu@arm.com>
>
Thanks for all the review and testing. Much appreciated!
--
Regards,
Sudeep
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prev parent reply other threads:[~2022-06-27 16:24 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-21 19:20 [PATCH v4 00/20] arch_topology: Updates to add socket support and fix cluster ids Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 01/20] ACPI: PPTT: Use table offset as fw_token instead of virtual address Sudeep Holla
2022-06-22 11:47 ` Rafael J. Wysocki
2022-06-27 13:41 ` Ionela Voinescu
2022-06-21 19:20 ` [PATCH v4 02/20] cacheinfo: Use of_cpu_device_node_get instead cpu_dev->of_node Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 03/20] cacheinfo: Add helper to access any cache index for a given CPU Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 04/20] cacheinfo: Move cache_leaves_are_shared out of CONFIG_OF Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 05/20] cacheinfo: Add support to check if last level cache(LLC) is valid or shared Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 06/20] cacheinfo: Allow early detection and population of cache attributes Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 07/20] cacheinfo: Use cache identifiers to check if the caches are shared if available Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 08/20] arch_topology: Add support to parse and detect cache attributes Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 09/20] arch_topology: Use the last level cache information from the cacheinfo Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 10/20] arm64: topology: Remove redundant setting of llc_id in CPU topology Sudeep Holla
2022-06-23 15:55 ` Catalin Marinas
2022-06-21 19:20 ` [PATCH v4 11/20] arch_topology: Drop LLC identifier stash from the " Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 12/20] arch_topology: Set thread sibling cpumask only within the cluster Sudeep Holla
2022-06-27 13:42 ` Ionela Voinescu
2022-06-21 19:20 ` [PATCH v4 13/20] arch_topology: Check for non-negative value rather than -1 for IDs validity Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 14/20] arch_topology: Avoid parsing through all the CPUs once a outlier CPU is found Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 15/20] arch_topology: Don't set cluster identifier as physical package identifier Sudeep Holla
2022-06-27 13:43 ` Ionela Voinescu
2022-06-21 19:20 ` [PATCH v4 16/20] arch_topology: Drop unnecessary check for uninitialised package_id Sudeep Holla
2022-06-27 13:12 ` Ionela Voinescu
2022-06-27 16:30 ` Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 17/20] arch_topology: Limit span of cpu_clustergroup_mask() Sudeep Holla
2022-06-21 19:20 ` [PATCH v4 18/20] arch_topology: Set cluster identifier in each core/thread from /cpu-map Sudeep Holla
2022-06-27 13:47 ` Ionela Voinescu
2022-06-21 19:20 ` [PATCH v4 19/20] arch_topology: Add support for parsing sockets in /cpu-map Sudeep Holla
2022-06-27 13:47 ` Ionela Voinescu
2022-06-21 19:20 ` [PATCH v4 20/20] arch_topology: Warn that topology for nested clusters is not supported Sudeep Holla
2022-06-22 15:06 ` Ionela Voinescu
2022-06-22 15:46 ` Sudeep Holla
2022-06-27 13:54 ` [PATCH v4 00/20] arch_topology: Updates to add socket support and fix cluster ids Ionela Voinescu
2022-06-27 16:22 ` Sudeep Holla [this message]
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