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From: Christoph Hellwig <hch@infradead.org>
To: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	Jun Nie <jun.nie@linaro.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>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>
Subject: Re: [PATCH 4/4] mmc: sdhci: Add DMA memory boundary workaround
Date: Tue, 3 Dec 2019 05:06:09 -0800
Message-ID: <20191203130609.GA2144@infradead.org> (raw)
In-Reply-To: <20191203172434.39b2c2c2@xhacker.debian>

On Tue, Dec 03, 2019 at 09:49:49AM +0000, Jisheng Zhang wrote:
> > As in exactly one boundary and not an alignment?  Where the one
> > boundary is not a power of two and thus can't be expressed?
> 
> Take drivers/mmc/host/sdhci-of-dwcmshc.c for example, target physical DMA addr
> can't span 128MB, 256MB, 128*3MB, ...128*nMB
> 
> I'm not sure whether blk_queue_segment_boundary could solve this limitation.

That is exaxtly the kind of limitation blk_queue_segment_boundary is
intended for.

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191202144104.5069-1-jun.nie@linaro.org>
     [not found] ` <20191202144104.5069-5-jun.nie@linaro.org>
     [not found]   ` <20191203103320.273a7309@xhacker.debian>
     [not found]     ` <CABymUCMVi_N2Mt82YDt7wrys4Z_vnXYEu15-YBa+S1CejT9iZw@mail.gmail.com>
     [not found]       ` <20191203165123.4e6f9e28@xhacker.debian>
2019-12-03  9:18         ` Christoph Hellwig
2019-12-03  9:49           ` Jisheng Zhang
2019-12-03 13:06             ` Christoph Hellwig [this message]
2019-12-04  7:11               ` Jisheng Zhang

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