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From: Adrian Hunter <adrian.hunter@intel.com>
To: Christoph Hellwig <hch@infradead.org>,
	Linus Walleij <linus.walleij@linaro.org>
Cc: linux-block@vger.kernel.org, Ulf Hansson <ulf.hansson@linaro.org>,
	linux-mmc <linux-mmc@vger.kernel.org>,
	Bough Chen <haibo.chen@nxp.com>,
	Alex Lemberg <alex.lemberg@sandisk.com>,
	Mateusz Nowak <mateusz.nowak@intel.com>,
	Yuliy Izrailov <Yuliy.Izrailov@sandisk.com>,
	Jaehoon Chung <jh80.chung@samsung.com>,
	Dong Aisheng <dongas86@gmail.com>,
	Das Asutosh <asutoshd@codeaurora.org>,
	Zhangfei Gao <zhangfei.gao@gmail.com>,
	Sahitya Tummala <stummala@codeaurora.org>,
	Harjani Ritesh <riteshh@codeaurora.org>,
	Venu Byravarasu <vbyravarasu@nvidia.com>,
	Shawn Lin <shawn.lin@rock-chips.com>
Subject: Re: [PATCH V5 11/13] mmc: block: Add CQE support
Date: Thu, 31 Aug 2017 15:00:26 +0300	[thread overview]
Message-ID: <745aa441-81c8-04e1-0b0c-13e072110255@intel.com> (raw)
In-Reply-To: <20170831102324.GA6757@infradead.org>

On 31/08/17 13:23, Christoph Hellwig wrote:
> On Sun, Aug 20, 2017 at 02:13:03PM +0200, Linus Walleij wrote:
>> So adding a new (in effect) invasive block driver needs to at least
>> be CC:ed to the block maintainers so we don't sneak anything like
>> that in under the radar.
> 
> Yes.
> 
>> And this semaphoring and threading is just as confusing as ever and now
>> we have two of them. (Sorry, I'm grumpy.)
> 
> But your are grumpy for a good reason.  The MMC driver is a pain
> to understand for even a seasons block layer developer.
> 
>> What we need is an MMC stack where it is clear where blocks come in
>> and out and how they are processed by the block layer, but now we
>> already have a scary Rube Goldberg-machine and it is not getting better.
>> If people have different feelings they can tell me off right now.
> 
> Agreed.
> 
>>
>> I have my hopes up that we can get the code lesser and more readable
>> with MQ, as I tried to illustrate in my attempts, which are indeed lame
>> because they don't work because of misc and SDIO use cases, but
>> I'm honestly doing my best. Currently with other clean-ups to get a
>> clean surface to do that.
>>
>> As it stands, the MQ migration work size is in some spots doubled or
>> more than doubled after this commit :(
> 
> I don't think we should merge this.
> 

OK, let's merge the blk-mq version then.  Here it is in V7:

	https://marc.info/?l=linux-mmc&m=150418101630159&w=2

  reply	other threads:[~2017-08-31 12:07 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-10 12:08 [PATCH V5 00/13] mmc: Add Command Queue support Adrian Hunter
2017-08-10 12:08 ` [PATCH V5 01/13] mmc: core: Add mmc_retune_hold_now() Adrian Hunter
2017-08-20 11:26   ` Linus Walleij
2017-08-22 11:12   ` Ulf Hansson
2017-08-10 12:08 ` [PATCH V5 02/13] mmc: core: Add members to mmc_request and mmc_data for CQE's Adrian Hunter
2017-08-20 11:29   ` Linus Walleij
2017-08-21  9:26     ` Adrian Hunter
2017-08-22 11:12   ` Ulf Hansson
2017-08-10 12:08 ` [PATCH V5 03/13] mmc: host: Add CQE interface Adrian Hunter
2017-08-20 11:31   ` Linus Walleij
2017-08-22 11:13   ` Ulf Hansson
2017-08-23  6:54     ` Adrian Hunter
2017-08-23 12:48       ` Ulf Hansson
2017-08-24  6:53         ` Adrian Hunter
2017-08-24  9:24           ` Ulf Hansson
2017-08-10 12:08 ` [PATCH V5 04/13] mmc: core: Turn off CQE before sending commands Adrian Hunter
2017-08-20 11:32   ` Linus Walleij
2017-08-22 11:13   ` Ulf Hansson
2017-08-10 12:08 ` [PATCH V5 05/13] mmc: core: Add support for handling CQE requests Adrian Hunter
2017-08-20 11:39   ` Linus Walleij
2017-08-21  9:26     ` Adrian Hunter
2017-08-31 11:32       ` Linus Walleij
2017-08-22  8:06   ` Ulf Hansson
2017-08-10 12:08 ` [PATCH V5 06/13] mmc: core: Remove unused MMC_CAP2_PACKED_CMD Adrian Hunter
2017-08-20 11:33   ` Linus Walleij
2017-08-22 11:12   ` Ulf Hansson
2017-08-10 12:08 ` [PATCH V5 07/13] mmc: mmc: Enable Command Queuing Adrian Hunter
2017-08-20 11:33   ` Linus Walleij
2017-08-10 12:08 ` [PATCH V5 08/13] mmc: mmc: Enable CQE's Adrian Hunter
2017-08-20 11:41   ` Linus Walleij
2017-08-10 12:08 ` [PATCH V5 09/13] mmc: block: Use local variables in mmc_blk_data_prep() Adrian Hunter
2017-08-20 11:43   ` Linus Walleij
2017-08-21  9:27     ` Adrian Hunter
2017-08-10 12:08 ` [PATCH V5 10/13] mmc: block: Prepare CQE data Adrian Hunter
2017-08-10 12:08 ` [PATCH V5 11/13] mmc: block: Add CQE support Adrian Hunter
2017-08-20 12:13   ` Linus Walleij
2017-08-21  9:27     ` Adrian Hunter
2017-08-31 10:05       ` Linus Walleij
2017-08-31 10:25       ` Christoph Hellwig
2017-08-31 10:23     ` Christoph Hellwig
2017-08-31 12:00       ` Adrian Hunter [this message]
2017-08-10 12:08 ` [PATCH V5 12/13] mmc: cqhci: support for command queue enabled host Adrian Hunter
2017-08-10 12:08 ` [PATCH V5 13/13] mmc: sdhci-pci: Add CQHCI support for Intel GLK Adrian Hunter
2017-08-11 10:33 ` [PATCH V5 00/13] mmc: Add Command Queue support Bough Chen
2017-08-17  7:45 ` Bough Chen
2017-08-17  8:56   ` Shawn Lin
2017-08-18 11:03   ` Adrian Hunter
2017-08-18 11:06 ` Adrian Hunter
2017-08-22 11:22 ` Ulf Hansson

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