From: Christoph Hellwig <hch@infradead.org>
To: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Cc: Jun Nie <jun.nie@linaro.org>,
Christoph Hellwig <hch@infradead.org>,
"ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"adrian.hunter@intel.com" <adrian.hunter@intel.com>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [PATCH 4/4] mmc: sdhci: Add DMA memory boundary workaround
Date: Tue, 3 Dec 2019 05:04:49 -0800 [thread overview]
Message-ID: <20191203130449.GA20607@infradead.org> (raw)
In-Reply-To: <20191203173256.55f527d5@xhacker.debian>
On Tue, Dec 03, 2019 at 09:49:33AM +0000, Jisheng Zhang wrote:
> > can't work. I'm not sure I understand blk_queue_segment_boundary() properly.
> > May Christoph help to clarify?
>
> what's more, not all scatterlist in mmc are from block layer, for example,
> __mmc_blk_ioctl_cmd(), mmc_test.c etc..
>
> How do we ensure the boundary is fine in these cases?
By using block layer passthrough requests (REQ_OP_DRV*). Otherwise
any other I/O limit imposed by the driver is ignored as well.
prev parent reply other threads:[~2019-12-03 13:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 14:41 [PATCH 0/4] mmc: Add sdhci workaround stability enhencement Jun Nie
2019-12-02 14:41 ` [PATCH 1/4] mmc: sdhci: Add delay after power off Jun Nie
2019-12-03 7:26 ` Adrian Hunter
2019-12-02 14:41 ` [PATCH 2/4] mmc: sdhci: dt: Add DMA boundary and HS400 properties Jun Nie
2019-12-13 23:01 ` Rob Herring
2019-12-17 14:56 ` Jun Nie
2019-12-02 14:41 ` [PATCH 3/4] mmc: sdhci: Set ctrl_hs400 value in dts Jun Nie
2019-12-03 7:52 ` Adrian Hunter
2019-12-02 14:41 ` [PATCH 4/4] mmc: sdhci: Add DMA memory boundary workaround Jun Nie
2019-12-02 17:52 ` Christoph Hellwig
2019-12-03 3:29 ` Jun Nie
2019-12-03 7:36 ` Christoph Hellwig
2019-12-04 6:00 ` Jun Nie
2019-12-04 7:14 ` Jisheng Zhang
2019-12-10 9:36 ` Ulf Hansson
2019-12-03 2:47 ` Jisheng Zhang
2019-12-03 3:33 ` Jun Nie
2019-12-03 9:05 ` Jisheng Zhang
2019-12-03 9:18 ` Christoph Hellwig
2019-12-03 9:49 ` Jisheng Zhang
2019-12-03 13:06 ` Christoph Hellwig
2019-12-04 7:11 ` Jisheng Zhang
2019-12-03 9:49 ` Jisheng Zhang
2019-12-03 13:04 ` Christoph Hellwig [this message]
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