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From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Jeremy Linton <jeremy.linton@arm.com>
Cc: ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Sudeep Holla <Sudeep.Holla@arm.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
	Hanjun Guo <hanjun.guo@linaro.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Will Deacon <Will.Deacon@arm.com>,
	Catalin Marinas <Catalin.Marinas@arm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Mark Rutland <Mark.Rutland@arm.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-riscv@lists.infradead.org, wangxiongfeng2@huawei.com,
	vkilari@codeaurora.org, Al Stone <ahs3@redhat.com>,
	Dietmar Eggemann <Dietmar.Eggemann@arm.com>,
	Morten Rasmussen <Morten.Rasmussen@arm.com>,
	palmer@sifive.com, Len Brown <lenb@kernel.org>,
	John Garry <john.garry@huawei.com>,
	austinwc@codeaurora.org, tnowicki@caviumnetworks.com,
	jhugo@codeaurora.org, Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: Re: [PATCH v9 05/12] ACPI/PPTT: Add Processor Properties Topology Table parsing
Date: Sat, 12 May 2018 12:09:40 +0200	[thread overview]
Message-ID: <CAJZ5v0h4OeTaG2h0Q1c8zX93tici_nfLftpEyKWSkXoztHuUDg@mail.gmail.com> (raw)
In-Reply-To: <20180511235807.30834-6-jeremy.linton@arm.com>

On Sat, May 12, 2018 at 1:58 AM, Jeremy Linton <jeremy.linton@arm.com> wrote:
> ACPI 6.2 adds a new table, which describes how processing units
> are related to each other in tree like fashion. Caches are
> also sprinkled throughout the tree and describe the properties
> of the caches in relation to other caches and processing units.
>
> Add the code to parse the cache hierarchy and report the total
> number of levels of cache for a given core using
> acpi_find_last_cache_level() as well as fill out the individual
> cores cache information with cache_setup_acpi() once the
> cpu_cacheinfo structure has been populated by the arch specific
> code.
>
> An additional patch later in the set adds the ability to report
> peers in the topology using find_acpi_cpu_topology()
> to report a unique ID for each processing unit at a given level
> in the tree. These unique id's can then be used to match related
> processing units which exist as threads, within a given
> package, etc.
>
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Tested-by: Vijaya Kumar K <vkilari@codeaurora.org>
> Tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
> Tested-by: Tomasz Nowicki <Tomasz.Nowicki@cavium.com>
> Acked-by: Sudeep Holla <sudeep.holla@arm.com>
> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/acpi/pptt.c  | 655 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/acpi.h |   4 +
>  2 files changed, 659 insertions(+)
>  create mode 100644 drivers/acpi/pptt.c
>
> diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
> new file mode 100644
> index 000000000000..e5ea1974d1e3
> --- /dev/null
> +++ b/drivers/acpi/pptt.c
> @@ -0,0 +1,655 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * pptt.c - parsing of Processor Properties Topology Table (PPTT)
> + *
> + * Copyright (C) 2018, ARM
> + *
> + * This file implements parsing of the Processor Properties Topology Table
> + * which is optionally used to describe the processor and cache topology.
> + * Due to the relative pointers used throughout the table, this doesn't
> + * leverage the existing subtable parsing in the kernel.
> + *
> + * The PPTT structure is an inverted tree, with each node potentially
> + * holding one or two inverted tree data structures describing
> + * the caches available at that level. Each cache structure optionally
> + * contains properties describing the cache at a given level which can be
> + * used to override hardware probed values.
> + */
> +#define pr_fmt(fmt) "ACPI PPTT: " fmt
> +
> +#include <linux/acpi.h>
> +#include <linux/cacheinfo.h>
> +#include <acpi/processor.h>
> +
> +static struct acpi_subtable_header *fetch_pptt_subtable(struct acpi_table_header *table_hdr,
> +                                                       u32 pptt_ref)
> +{
> +       struct acpi_subtable_header *entry;
> +
> +       /* there isn't a subtable at reference 0 */
> +       if (pptt_ref < sizeof(struct acpi_subtable_header))
> +               return NULL;
> +
> +       if (pptt_ref + sizeof(struct acpi_subtable_header) > table_hdr->length)
> +               return NULL;
> +
> +       entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr, pptt_ref);
> +
> +       if (entry->length == 0)
> +               return NULL;
> +
> +       if (pptt_ref + entry->length > table_hdr->length)
> +               return NULL;
> +
> +       return entry;
> +}
> +
> +static struct acpi_pptt_processor *fetch_pptt_node(struct acpi_table_header *table_hdr,
> +                                                  u32 pptt_ref)
> +{
> +       return (struct acpi_pptt_processor *)fetch_pptt_subtable(table_hdr, pptt_ref);
> +}
> +
> +static struct acpi_pptt_cache *fetch_pptt_cache(struct acpi_table_header *table_hdr,
> +                                               u32 pptt_ref)
> +{
> +       return (struct acpi_pptt_cache *)fetch_pptt_subtable(table_hdr, pptt_ref);

I don't think you really need the explicit type cast here and above,
but that's very minor.

> +}

Please feel free to add

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

to the patch and route it through the arch tree as needed.

Thanks,
Rafael

  reply	other threads:[~2018-05-12 10:09 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 23:57 [PATCH v9 00/12] Support PPTT for ARM64 Jeremy Linton
2018-05-11 23:57 ` [PATCH v9 01/12] drivers: base: cacheinfo: move cache_setup_of_node() Jeremy Linton
2018-05-11 23:57 ` [PATCH v9 02/12] drivers: base: cacheinfo: setup DT cache properties early Jeremy Linton
2018-05-15 17:15   ` Jeremy Linton
2018-05-15 19:32     ` Andy Shevchenko
2018-05-16 10:56       ` Sudeep Holla
2018-05-17 15:47         ` Sudeep Holla
2018-05-18 21:50           ` Andy Shevchenko
2018-05-21  9:27             ` Sudeep Holla
2018-05-21 10:15               ` Sudeep Holla
2018-05-21 10:32       ` [PATCH] drivers: base: cacheinfo: use OF property_read_u64 instead of get_property,read_number Sudeep Holla
2018-05-21 12:53         ` [PATCH v2] drivers: base: cacheinfo: use OF property_read_u32 " Sudeep Holla
2018-06-05 16:21           ` Andy Shevchenko
2018-06-05 16:26             ` Sudeep Holla
2018-06-05 16:34               ` Andy Shevchenko
2018-05-17  6:54     ` [PATCH v9 02/12] drivers: base: cacheinfo: setup DT cache properties early Greg KH
2018-05-17  9:08       ` Sudeep Holla
2018-05-17  9:35         ` Greg KH
2018-05-11 23:57 ` [PATCH v9 03/12] cacheinfo: rename of_node to fw_token Jeremy Linton
2018-05-11 23:57 ` [PATCH v9 04/12] arm64/acpi: Create arch specific cpu to acpi id helper Jeremy Linton
2018-05-14 14:41   ` Sudeep Holla
2018-05-11 23:58 ` [PATCH v9 05/12] ACPI/PPTT: Add Processor Properties Topology Table parsing Jeremy Linton
2018-05-12 10:09   ` Rafael J. Wysocki [this message]
2018-05-15 21:42     ` Jeremy Linton
2018-05-16  8:24       ` Rafael J. Wysocki
2018-05-11 23:58 ` [PATCH v9 06/12] ACPI: Enable PPTT support on ARM64 Jeremy Linton
2018-05-11 23:58 ` [PATCH v9 07/12] drivers: base cacheinfo: Add support for ACPI based firmware tables Jeremy Linton
2018-05-11 23:58 ` [PATCH v9 08/12] arm64: " Jeremy Linton
2018-05-11 23:58 ` [PATCH v9 09/12] arm64: topology: rename cluster_id Jeremy Linton
2018-05-11 23:58 ` [PATCH v9 10/12] arm64: topology: enable ACPI/PPTT based CPU topology Jeremy Linton
2018-05-11 23:58 ` [PATCH v9 11/12] ACPI: Add PPTT to injectable table list Jeremy Linton
2018-05-12 10:10   ` Rafael J. Wysocki
2018-05-11 23:58 ` [PATCH v9 12/12] arm64: topology: divorce MC scheduling domain from core_siblings Jeremy Linton
2018-05-17 17:05 ` [PATCH v9 00/12] Support PPTT for ARM64 Catalin Marinas
2018-05-29 10:48   ` Geert Uytterhoeven
2018-05-29 11:14     ` Sudeep Holla
2018-05-29 11:56       ` Geert Uytterhoeven
2018-05-29 13:18         ` Sudeep Holla
2018-05-29 15:08           ` Will Deacon
2018-05-29 15:51             ` Geert Uytterhoeven
2018-05-29 17:08               ` Robin Murphy
2018-05-29 17:18                 ` Geert Uytterhoeven
2018-05-29 17:31                 ` Sudeep Holla
2018-05-29 20:16               ` Will Deacon
2018-05-29 20:48                 ` Jeremy Linton
2018-05-29 21:52               ` Jeremy Linton
2018-05-30 13:24                 ` Sudeep Holla
2018-05-29 15:23           ` Jeremy Linton
2018-05-29 15:50           ` Geert Uytterhoeven
2018-05-30  8:52             ` Morten Rasmussen
2018-06-05 13:55     ` [PATCH 1/3] Revert "arm64: topology: divorce MC scheduling domain from core_siblings" Sudeep Holla
2018-06-05 13:55       ` [PATCH 2/3] ACPI / PPTT: fix build when CONFIG_ACPI_PPTT is not enabled Sudeep Holla
2018-06-05 13:55       ` [PATCH 3/3] arm64: disable ACPI PPTT support temporarily Sudeep Holla
2018-06-05 14:09       ` [PATCH 1/3] Revert "arm64: topology: divorce MC scheduling domain from core_siblings" Geert Uytterhoeven
2018-06-05 14:12         ` Sudeep Holla
2018-06-04 15:12   ` [PATCH v9 00/12] Support PPTT for ARM64 Catalin Marinas

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