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Date:   Tue, 21 Feb 2017 00:20:52 +0800
From:   Fu Wei <fu.wei@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        rruigrok@...eaurora.org, "Abdulhamid, Harb" <harba@...eaurora.org>,
        Christopher Covington <cov@...eaurora.org>,
        Timur Tabi <timur@...eaurora.org>,
        G Gregory <graeme.gregory@...aro.org>,
        Al Stone <al.stone@...aro.org>, Jon Masters <jcm@...hat.com>,
        Wei Huang <wei@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Leo Duran <leo.duran@....com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-watchdog@...r.kernel.org, Tomasz Nowicki <tn@...ihalf.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Julien Grall <julien.grall@....com>, Fu Wei <fu.wei@...aro.org>
Subject: Re: [PATCH v21 00/13] acpi, clocksource: add GTDT driver and GTDT
 support in arm_arch_timer

Hi Mark, Marc

On 7 February 2017 at 02:50,  <fu.wei@...aro.org> wrote:
> From: Fu Wei <fu.wei@...aro.org>
>
> This patchset:
>     (1)Preparation for adding GTDT support in arm_arch_timer:
>         1. Introduce two functions to get the frequency from mmio and sysreg.
>         2. separate out device-tree code from arch_timer_detect_rate
>         3. remove arch_timer_detect_rate use arch_timer_get_*_freq directly
>         4. split arch_timer_rate for different types of timer
>         5. Refactor arch_timer_needs_probing, and move it into DT init call
>         6. Introduce some new structs and refactor the MMIO timer init code
>         for reusing some common code.
>
>     (2)Introduce ACPI GTDT parser: drivers/acpi/arm64/acpi_gtdt.c
>     Parse all kinds of timer in GTDT table of ACPI:arch timer,
>     memory-mapped timer and SBSA Generic Watchdog timer.
>     This driver can help to simplify all the relevant timer drivers,
>     and separate all the ACPI GTDT knowledge from them.
>
>     (3)Simplify ACPI code for arm_arch_timer
>
>     (4)Add GTDT support for ARM memory-mapped timer.
>
> This patchset has been tested on the following platforms with ACPI enabled:
>     (1)ARM Foundation v8 model
>
> Changelog:
> v21: https://lkml.org/lkml/2017/2/6/
>      Introduce two functions to get the frequency from mmio and sysreg.
>      Remove arch_timer_detect_rate use arch_timer_get_*_freq directly
>      Split arch_timer_rate for different types of timer.
>      Skip secure timer frame in GTDT driver.
>      Rebase to git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arch-timer/cleanup
>      (The first 6 patches in v20 have been merged into arch-timer/cleanup branch)

Did I follow your suggestion correctly?
I wonder how to improve this patchset. May I have your some suggestion
or feedback on v21? :-)

Great thanks for your help!

>
> v20: https://lkml.org/lkml/2017/1/18/534
>      Reorder the first 4 patches and split the 4th patches.
>      Leave CNTHCTL_* as they originally were.
>      Fix the bug in arch_timer_select_ppi.
>      Split "Rework counter frequency detection" patch.
>      Rework the arch_timer_detect_rate function.
>      Improve the commit message of "Refactor MMIO timer probing".
>      Rebase to 4.10.0-rc4
>
> v19: https://lkml.org/lkml/2016/12/21/25
>      Fix a '\n' missing in a error message in arch_timer_mem_init.
>      Add "request_mem_region" for ioremapping cntbase, according to
>      f947ee1 clocksource/drivers/arm_arch_timer: Map frame with of_io_request_and_map()
>      Rebase to 4.9.0-gfb779ff
>
> v18: https://lkml.org/lkml/2016/12/8/446
>      Fix 8/15 patch problem of "int ret;" in arch_timer_acpi_init.
>      Rebase to 4.9.0-rc8-g9269898
>
> v17: https://lkml.org/lkml/2016/11/25/140
>      Take out some cleanups from 4/15.
>      Merge 5/15 and 6/15, improve PPI determination code,
>      improve commit message.
>      Rework counter frequency detection.
>      Move arch_timer_needs_of_probing into DT init call.
>      Move Platform Timer scan loop back to timer init call to avoid allocating
>      and free memory.
>      Improve all the exported functions' comment.
>
> v16: https://lkml.org/lkml/2016/11/16/268
>      Fix patchset problem about static enum ppi_nr of 01/13 in v15.
>      Refactor arch_timer_detect_rate.
>      Refactor arch_timer_needs_probing.
>
> v15: https://lkml.org/lkml/2016/11/15/366
>      Re-order patches
>      Add arm_arch_timer refactoring patches to prepare for GTDT:
>          1. rename some  enums and defines, and some cleanups
>          2. separate out arch_timer_uses_ppi init code and fix a potential bug
>          3. Improve some new structs, refactor the timer init code.
>      Since the some structs have been changed, GTDT parser for memory-mapped
>      timer and SBSA Generic Watchdog timer have been update.
>
> v14: https://lkml.org/lkml/2016/9/28/573
>      Separate memory-mapped timer GTDT support into two patches
>          1. Refactor the timer init code to prepare for GTDT
>          2. Add GTDT support for memory-mapped timer
>
> v13: http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1231717.html
>      Improve arm_arch_timer code for memory-mapped
>      timer GTDT support, refactor original memory-mapped timer
>      dt support for reusing some common code.
>
> v12: https://lkml.org/lkml/2016/9/13/250
>      Rebase to latest Linux 4.8-rc6
>      Delete the confusing "skipping" in the error message.
>
> V11: https://lkml.org/lkml/2016/9/6/354
>      Rebase to latest Linux 4.8-rc5
>      Delete typedef (suggested by checkpatch.pl)
>
> V10: https://lkml.org/lkml/2016/7/26/215
>      Drop the "readq" patch.
>      Rebase to latest Linux 4.7.
>
> V9: https://lkml.org/lkml/2016/7/25/345
>     Improve pr_err message in acpi gtdt driver.
>     Update Commit message for 7/9
>     shorten the irq mapping function name
>     Improve GTDT driver for memory-mapped timer
>
> v8: https://lkml.org/lkml/2016/7/19/660
>     Improve "pr_fmt(fmt)" definition: add "ACPI" in front of "GTDT",
>     and also improve printk message.
>     Simplify is_timer_block and is_watchdog.
>     Merge acpi_gtdt_desc_init and gtdt_arch_timer_init into acpi_gtdt_init();
>     Delete __init in include/linux/acpi.h for GTDT API
>     Make ARM64 select GTDT.
>     Delete "#include <linux/module.h>" from acpi_gtdt.c
>     Simplify GT block parse code.
>
> v7: https://lkml.org/lkml/2016/7/13/769
>     Move the GTDT driver to drivers/acpi/arm64
>     Add add the ARM64-specific ACPI Support maintainers in MAINTAINERS
>     Merge 3 patches of GTDT parser driver.
>     Fix the for_each_platform_timer bug.
>
> v6: https://lkml.org/lkml/2016/6/29/580
>     split the GTDT driver to 4 parts: basic, arch_timer, memory-mapped timer,
>     and SBSA Generic Watchdog timer
>     Improve driver by suggestions and example code from Daniel Lezcano
>
> v5: https://lkml.org/lkml/2016/5/24/356
>     Sorting out all patches, simplify the API of GTDT driver:
>     GTDT driver just fills the data struct for arm_arch_timer driver.
>
> v4: https://lists.linaro.org/pipermail/linaro-acpi/2016-March/006667.html
>     Delete the kvm relevant patches
>     Separate two patches for sorting out the code for arm_arch_timer.
>     Improve irq info export code to allow missing irq info in GTDT table.
>
> v3: https://lkml.org/lkml/2016/2/1/658
>     Improve GTDT driver code:
>       (1)improve pr_* by defining pr_fmt(fmt)
>       (2)simplify gtdt_sbsa_gwdt_init
>       (3)improve gtdt_arch_timer_data_init, if table is NULL, it will try
>       to get GTDT table.
>     Move enum ppi_nr to arm_arch_timer.h, and add enum spi_nr.
>     Add arm_arch_timer get ppi from DT and GTDT support for kvm.
>
> v2: https://lkml.org/lkml/2015/12/2/10
>     Rebase to latest kernel version(4.4-rc3).
>     Fix the bug about the config problem,
>     use CONFIG_ACPI_GTDT instead of CONFIG_ACPI in arm_arch_timer.c
>
> v1: The first upstreaming version: https://lkml.org/lkml/2015/10/28/553
>
> Fu Wei (13):
>   clocksource: arm_arch_timer: introduce two functions to get the
>     frequency from mmio and sysreg.
>   clocksource: arm_arch_timer: separate out device-tree code from
>     arch_timer_detect_rate
>   clocksource: arm_arch_timer: remove arch_timer_detect_rate
>   clocksource: arm_arch_timer: split arch_timer_rate for different types
>     of timer
>   clocksource: arm_arch_timer: refactor arch_timer_needs_probing
>   clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT
>     init call
>   clocksource: arm_arch_timer: introduce some new structs to prepare for
>     GTDT
>   clocksource: arm_arch_timer: refactor MMIO timer probing.
>   acpi/arm64: Add GTDT table parse driver
>   clocksource: arm_arch_timer: simplify ACPI support code.
>   acpi/arm64: Add memory-mapped timer support in GTDT driver
>   clocksource: arm_arch_timer: add GTDT support for memory-mapped timer
>   acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver
>
>  arch/arm64/Kconfig                   |   1 +
>  drivers/acpi/arm64/Kconfig           |   3 +
>  drivers/acpi/arm64/Makefile          |   1 +
>  drivers/acpi/arm64/gtdt.c            | 378 +++++++++++++++++++++++++++++++++++
>  drivers/clocksource/arm_arch_timer.c | 354 ++++++++++++++++++++------------
>  drivers/watchdog/Kconfig             |   1 +
>  include/clocksource/arm_arch_timer.h |  17 ++
>  include/linux/acpi.h                 |   7 +
>  8 files changed, 635 insertions(+), 127 deletions(-)
>  create mode 100644 drivers/acpi/arm64/gtdt.c
>
> --
> 2.9.3
>



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat

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