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From: Fu Wei <fu.wei@linaro.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Hanjun Guo <hanjun.guo@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	Linaro ACPI Mailman List <linaro-acpi@lists.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	rruigrok@codeaurora.org, "Abdulhamid,
	Harb" <harba@codeaurora.org>,
	Christopher Covington <cov@codeaurora.org>,
	Timur Tabi <timur@codeaurora.org>,
	G Gregory <graeme.gregory@linaro.org>,
	Al Stone <al.stone@linaro.org>, Jon Masters <jcm@redhat.com>,
	Wei Huang <wei@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>,
	Leo Duran <leo.duran@amd.com>, Wim Van Sebroeck <wim@iguana.be>,
	Guenter Roeck <linux@roeck-us.net>,
	linux-watchdog@vger.kernel.org, Tomasz Nowicki <tn@semihalf.com>,
	Christoffer Dall <christoffer.dall@linaro.org>,
	Julien Grall <julien.grall@arm.com>
Subject: Re: [PATCH v19 10/15] clocksource/drivers/arm_arch_timer: Refactor the timer init code to prepare for GTDT
Date: Tue, 17 Jan 2017 18:30:04 +0800	[thread overview]
Message-ID: <CADyBb7tFaSshUmZsJbNO2tnbqAKEii39NQVfcx5CqDiDsK5OJA@mail.gmail.com> (raw)
In-Reply-To: <20170116183032.GL5908@leverpostej>

Hi Mark,

On 17 January 2017 at 02:30, Mark Rutland <mark.rutland@arm.com> wrote:
> On Wed, Dec 21, 2016 at 02:45:58PM +0800, fu.wei@linaro.org wrote:
>> From: Fu Wei <fu.wei@linaro.org>
>>
>> The patch refactor original memory-mapped timer init code:
>>     (1) Refactor "arch_timer_mem_init", make it become a common code for
>>         memory-mapped timer init.
>>     (2) Add a new function "arch_timer_mem_of_init" for DT init.
>
> As a general note, please write proper commit messages, describing what
> the problem is, and why we are making the changes. These bullet points
> don't add anything to what can be derived from a glance at the code.
>
> For this patch, you can use:
>
>   clocksource: arm_arch_timer: refactor MMIO timer probing
>
>   Currently the code to probe MMIO architected timers mixes DT parsing
>   with actual poking of hardware. This makes the code harder than
>   necessary to understand, and makes it difficult to add support for
>   probing via ACPI.
>
>   This patch factors all the DT-specific logic out of
>   arch_timer_mem_init(), into a new function, arch_timer_mem_of_init().
>   The former pokes the hardware and determines the suitablility of
>   frames based on a datastructure populated by the latter.
>
>   This cleanly separates the two and will make it possible to add
>   probing using the ACPI GTDT in subsequent patches.

Great thanks for this upstream tip.
I have used your example commit message instead.
It will be in v20.

>
> [...]
>
>> +     for_each_available_child_of_node(np, frame_node) {
>> +             int n;
>> +             struct arch_timer_mem_frame *frame = &timer_mem->frame[i];
>> +
>> +             if (of_property_read_u32(frame_node, "frame-number", &n)) {
>> +                     pr_err("Missing frame-number\n");
>> +                     of_node_put(frame_node);
>> +                     goto out;
>> +             }
>> +             frame->frame_nr = n;
>> +
>> +             if (of_address_to_resource(frame_node, 0, &res)) {
>> +                     of_node_put(frame_node);
>> +                     goto out;
>> +             }
>> +             frame->cntbase = res.start;
>> +             frame->size = resource_size(&res);
>> +
>> +             frame->virt_irq = irq_of_parse_and_map(frame_node,
>> +                                                    ARCH_TIMER_VIRT_SPI);
>> +             frame->phys_irq = irq_of_parse_and_map(frame_node,
>> +                                                    ARCH_TIMER_PHYS_SPI);
>>
>> -     if (!arch_timer_needs_of_probing())
>> +             if (++i >= ARCH_TIMER_MEM_MAX_FRAMES)
>> +                     break;
>> +     }
>
> It would be good if we could warn upon seeing more than
> ARCH_TIMER_MEM_MAX_FRAMES children, since that's obviously an error.

OK, NP, will use

if (i >= ARCH_TIMER_MEM_MAX_FRAMES) {
        pr_err(FW_BUG "too many frames, ARMv8 spec only allows 8.\n");
        goto out;
}

at the beginning of this loop.

Here will be replaced by  i++;

Great thanks for your suggestion!

>
> Thanks,
> Mark.



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat

  reply	other threads:[~2017-01-17 10:30 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-21  6:45 [PATCH v19 00/15] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei
2016-12-21  6:45 ` [PATCH v19 01/15] clocksource/drivers/arm_arch_timer: Move enums and defines to header file fu.wei
2016-12-21  6:45 ` [PATCH v19 02/15] clocksource/drivers/arm_arch_timer: Add a new enum for spi type fu.wei
2016-12-21  6:45 ` [PATCH v19 03/15] clocksource/drivers/arm_arch_timer: Improve printk relevant code fu.wei
2016-12-21  6:45 ` [PATCH v19 04/15] clocksource/drivers/arm_arch_timer: rename some enums and defines fu.wei
2016-12-21  6:45 ` [PATCH v19 05/15] clocksource/drivers/arm_arch_timer: rework PPI determination fu.wei
2017-01-16 17:29   ` Mark Rutland
2017-01-17 23:49     ` Fu Wei
2016-12-21  6:45 ` [PATCH v19 06/15] clocksource/drivers/arm_arch_timer: Rework counter frequency detection fu.wei
2017-01-16 17:50   ` Mark Rutland
2017-01-18  4:27     ` Fu Wei
2016-12-21  6:45 ` [PATCH v19 07/15] clocksource/drivers/arm_arch_timer: Refactor arch_timer_needs_probing fu.wei
2016-12-21  6:45 ` [PATCH v19 08/15] clocksource/drivers/arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei
2016-12-21  6:45 ` [PATCH v19 09/15] clocksource/drivers/arm_arch_timer: Introduce some new structs to prepare for GTDT fu.wei
2016-12-21  6:45 ` [PATCH v19 10/15] clocksource/drivers/arm_arch_timer: Refactor the timer init code " fu.wei
2017-01-16 18:30   ` Mark Rutland
2017-01-17 10:30     ` Fu Wei [this message]
2017-01-17 10:39       ` Fu Wei
2017-01-17 12:18       ` Timur Tabi
2017-01-17 12:29         ` Mark Rutland
2017-01-17 13:22           ` Fu Wei
2016-12-21  6:45 ` [PATCH v19 11/15] acpi/arm64: Add GTDT table parse driver fu.wei
2016-12-21  6:46 ` [PATCH v19 12/15] clocksource/drivers/arm_arch_timer: Simplify ACPI support code fu.wei
2016-12-21  6:46 ` [PATCH v19 13/15] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei
2016-12-21  6:46 ` [PATCH v19 14/15] clocksource/drivers/arm_arch_timer: Add GTDT support for memory-mapped timer fu.wei
2016-12-21  6:46 ` [PATCH v19 15/15] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei
2017-01-16  6:26 ` [PATCH v19 00/15] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer Fu Wei
2017-01-16 12:01   ` Mark Rutland
2017-01-16 12:04     ` Fu Wei
2017-01-16 17:00 ` Mark Rutland
2017-01-17  9:14   ` Fu Wei

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