Re: [PATCH v22 00/11] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer

[Fu Wei <fu.wei@linaro.org>]

Hi Jon,

Thanks for your email
 An hour ago, I just got some feedback from Lorenzo, will update my
patchset ASAP according to his suggestion.

But I still need some feedback form Mark, I can see some progress here:
https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arch-timer/gtdt

I guess I should rebase my patchset to his gtdt branch for v23.

So now, I am waiting for Mark's feedback to move on.

On 28 March 2017 at 19:32, Jon Masters <jcm@jonmasters.org> wrote:
> Anyone got review comments for this series?
>
> On 03/21/2017 12:31 PM, fu.wei@linaro.org wrote:
>> From: Fu Wei <fu.wei@linaro.org>
>>
>> This patchset:
>>     (1)Preparation for adding GTDT support in arm_arch_timer:
>>         1. Introduce a wrapper function to get the frequency from mmio.
>>         2. separate out device-tree code from arch_timer_detect_rate
>>         3. remove arch_timer_detect_rate use arch_timer_*get_cntfrq directly
>>         4. Refactor arch_timer_needs_probing, and move it into DT init call
>>         5. 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:
>> v22: https://lkml.org/lkml/2017/3/21/
>>      Rebase to git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arch-timer/cleanup
>>      Only Introduce arch_timer_mem_get_cntfrq to get the frequency from mmio.
>>      Merged patch 2,3(about arch_timer_detect_rate).
>>      Keep arch_timer_rate, do NOT split it for different types of timer.
>>      Improve  memory-mapped timer support by comments and variable name:
>>          data-->timer_mem
>>          frame-->gtdt_frame
>>      Delete zero check for SBSA watchdog irq.
>>      Skip secure SBSA watchdog in GTDT driver.
>>      Delete Kconfig modification for SBSA watchdog driver.
>>      Delete no_irq, using nr_res instead.
>>
>> v21: https://lkml.org/lkml/2017/2/6/734
>>      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)
>>
>> 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 (11):
>>   clocksource: arm_arch_timer: introduce a wrapper function to get the
>>     frequency from mmio.
>>   clocksource: arm_arch_timer: separate out device-tree code and remove
>>     arch_timer_detect_rate
>>   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            | 381 +++++++++++++++++++++++++++++++++++
>>  drivers/clocksource/arm_arch_timer.c | 326 +++++++++++++++++++-----------
>>  include/clocksource/arm_arch_timer.h |  17 ++
>>  include/linux/acpi.h                 |   7 +
>>  7 files changed, 614 insertions(+), 122 deletions(-)
>>  create mode 100644 drivers/acpi/arm64/gtdt.c
>>
>



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat