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Date: Wed, 27 Jun 2018 10:51:00 +0900
From: Byungchul Park <byungchul.park@....com>
To: SeongJae Park <sj38.park@...il.com>,
Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc: linux-doc <linux-doc@...r.kernel.org>,
linux-kernel@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH] locking/memory-barriers.txt/kokr: Update Korean
translation to fix broken DMA vs. MMIO ordering example
On 06/27/2018 07:43 AM, SeongJae Park wrote:
> On Wed, Jun 27, 2018 at 7:04 AM Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
>> On Tue, Jun 26, 2018 at 09:25:08PM +0900, SeongJae Park wrote:
>>> Hello Paul,
>>>
>>> On Tue, Jun 26, 2018 at 9:20 PM Paul E. McKenney
>>> <paulmck@...ux.vnet.ibm.com> wrote:
>>>> On Tue, Jun 26, 2018 at 03:58:27PM +0900, Byungchul Park wrote:
>>>>> On Tue, Jun 26, 2018 at 02:10:17PM +0900, SeongJae Park wrote:
>>>>>>
>>>>>> On Tue, 26 Jun 2018, Byungchul Park wrote:
>>>>>>
>>>>>>> On Tue, Jun 26, 2018 at 12:21:23PM +0900, sjpark wrote:
>>>>>>>> Hello Byungchul,
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, 26 Jun 2018, Byungchul Park wrote:
>>>>>>>>
>>>>>>>>> On Sun, Jun 17, 2018 at 02:16:08PM +0900, SeongJae Park wrote:
>>>>>>>>>> Translate this commit to Korean:
>>>>>>>>>>
>>>>>>>>>> 5846581e3563 ("locking/memory-barriers.txt: Fix broken DMA vs. MMIO ordering example")
>>>>>>>>> Hi SeongJae,
>>>>>>>>>
>>>>>>>>> You keep doing good jobs ;)
>>>>>>>>>
>>>>>>>>> I believe it would be better if you consider the little things below
>>>>>>>>> more. What do you think about it, SeongJae?
>>>>>>>> Thank you for great comments!
>>>>>>>>
>>>>>>>>>> Signed-off-by: SeongJae Park <sj38.park@...il.com>
>>>>>>>>>> ---
>>>>>>>>>> Documentation/translations/ko_KR/memory-barriers.txt | 15 +++++++--------
>>>>>>>>>> 1 file changed, 7 insertions(+), 8 deletions(-)
>>>>>>>>>>
>>>>>>>>>> diff --git a/Documentation/translations/ko_KR/memory-barriers.txt b/Documentation/translations/ko_KR/memory-barriers.txt
>>>>>>>>>> index 921739d00f69..ada0a709cce1 100644
>>>>>>>>>> --- a/Documentation/translations/ko_KR/memory-barriers.txt
>>>>>>>>>> +++ b/Documentation/translations/ko_KR/memory-barriers.txt
>>>>>>>>>> @@ -1891,19 +1891,18 @@ Mandatory 배리어들은 SMP 시스템에서도 UP 시스템에서도 SMP 효
>>>>>>>>>> /* 소유권을 수정 */
>>>>>>>>>> desc->status = DEVICE_OWN;
>>>>>>>>>>
>>>>>>>>>> - /* MMIO 를 통해 디바이스에 공지를 하기 전에 메모리를 동기화 */
>>>>>>>>>> - wmb();
>>>>>>>>>> -
>>>>>>>>>> /* 업데이트된 디스크립터의 디바이스에 공지 */
>>>>>>>>>> writel(DESC_NOTIFY, doorbell);
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> dma_rmb() 는 디스크립터로부터 데이터를 읽어오기 전에 디바이스가 소유권을
>>>>>>>>>> - 내놓았음을 보장하게 하고, dma_wmb() 는 디바이스가 자신이 소유권을 다시
>>>>>>>>>> - 가졌음을 보기 전에 디스크립터에 데이터가 쓰였음을 보장합니다. wmb() 는
>>>>>>>>>> - 캐시 일관성이 없는 (cache incoherent) MMIO 영역에 쓰기를 시도하기 전에
>>>>>>>>>> - 캐시 일관성이 있는 메모리 (cache coherent memory) 쓰기가 완료되었음을
>>>>>>>>>> - 보장해주기 위해 필요합니다.
>>>>>>>>>> + 내려놓았을 것을 보장하고, dma_wmb() 는 디바이스가 자신이 소유권을 다시
>>>>>>>>>> + 가졌음을 보기 전에 디스크립터에 데이터가 쓰였을 것을 보장합니다. writel()
>>>>>>>>> ^
>>>>>>>>> 참고로,
>>>>>>>> Nice comment. This will enhance the readability a lot.
>>>>>>> Could you add this, too? A quite little thing tho.
>>>>>> Oops, I missed that. Sorry. Attaching the patch below.
>>>>>>
>>>>>>
>>>>>> Thanks, SeongJae Park
>>>>> Thanks a lot, SeongJae.
>>>>>
>>>>> Acked-by: Byungchul Park <byungchul.park@....com>
>>>> Thank you both!
>>>>
>>>> The patch below is the complete patch, so that I should replace
>>>> what I have with it, correct? If not, please help me out here. ;-)
>>> Yes, correct! :)
>> Like this, then?
> Yes, of course ;)
Yes~
>
>
> Thanks,
> SeongJae Park
>
>> Thanx, Paul
>>
>> ------------------------------------------------------------------------
>>
>> commit 3cb0d7701c4ce6668fb5096c90ec6d5b4bf71638
>> Author: SeongJae Park <sj38.park@...il.com>
>> Date: Sun Jun 17 14:16:08 2018 +0900
>>
>> locking/memory-barriers.txt/kokr: Update Korean translation to fix broken DMA vs. MMIO ordering example
>>
>> Translate this commit to Korean:
>>
>> 5846581e3563 ("locking/memory-barriers.txt: Fix broken DMA vs. MMIO ordering example")
>>
>> Signed-off-by: SeongJae Park <sj38.park@...il.com>
>> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
>> [ paulmck: Updated based on feedback from Byungchul Park. ]
>> Acked-by: Byungchul Park <byungchul.park@....com>
>>
>> diff --git a/Documentation/translations/ko_KR/memory-barriers.txt b/Documentation/translations/ko_KR/memory-barriers.txt
>> index 921739d00f69..7f01fb1c1084 100644
>> --- a/Documentation/translations/ko_KR/memory-barriers.txt
>> +++ b/Documentation/translations/ko_KR/memory-barriers.txt
>> @@ -1891,22 +1891,22 @@ Mandatory 배리어들은 SMP 시스템에서도 UP 시스템에서도 SMP 효
>> /* 소유권을 수정 */
>> desc->status = DEVICE_OWN;
>>
>> - /* MMIO 를 통해 디바이스에 공지를 하기 전에 메모리를 동기화 */
>> - wmb();
>> -
>> /* 업데이트된 디스크립터의 디바이스에 공지 */
>> writel(DESC_NOTIFY, doorbell);
>> }
>>
>> dma_rmb() 는 디스크립터로부터 데이터를 읽어오기 전에 디바이스가 소유권을
>> - 내놓았음을 보장하게 하고, dma_wmb() 는 디바이스가 자신이 소유권을 다시
>> - 가졌음을 보기 전에 디스크립터에 데이터가 쓰였음을 보장합니다. wmb() 는
>> - 캐시 일관성이 없는 (cache incoherent) MMIO 영역에 쓰기를 시도하기 전에
>> - 캐시 일관성이 있는 메모리 (cache coherent memory) 쓰기가 완료되었음을
>> - 보장해주기 위해 필요합니다.
>> -
>> - consistent memory 에 대한 자세한 내용을 위해선 Documentation/DMA-API.txt
>> - 문서를 참고하세요.
>> + 내려놓았을 것을 보장하고, dma_wmb() 는 디바이스가 자신이 소유권을 다시
>> + 가졌음을 보기 전에 디스크립터에 데이터가 쓰였을 것을 보장합니다. 참고로,
>> + writel() 을 사용하면 캐시 일관성이 있는 메모리 (cache coherent memory)
>> + 쓰기가 MMIO 영역에의 쓰기 전에 완료되었을 것을 보장하므로 writel() 앞에
>> + wmb() 를 실행할 필요가 없음을 알아두시기 바랍니다. writel() 보다 비용이
>> + 저렴한 writel_relaxed() 는 이런 보장을 제공하지 않으므로 여기선 사용되지
>> + 않아야 합니다.
>> +
>> + writel_relaxed() 와 같은 완화된 I/O 접근자들에 대한 자세한 내용을 위해서는
>> + "커널 I/O 배리어의 효과" 섹션을, consistent memory 에 대한 자세한 내용을
>> + 위해선 Documentation/DMA-API.txt 문서를 참고하세요.
>>
>>
>> MMIO 쓰기 배리어
>>
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