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From: Christoph Hellwig <hch@lst.de>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: 冯锐 <rui_feng@realsil.com.cn>, "Christoph Hellwig" <hch@lst.de>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>
Subject: Re: [PATCH 3/3] mmc: rtsx: Add SD Express mode support for RTS5261
Date: Fri, 23 Oct 2020 11:14:08 +0200	[thread overview]
Message-ID: <20201023091408.GA5201@lst.de> (raw)
In-Reply-To: <CAPDyKFqwsJaYrXMVabR7qui6yqr4FAHfYq1ghfsf0HtRSZpGGw@mail.gmail.com>

On Fri, Oct 23, 2020 at 10:02:15AM +0200, Ulf Hansson wrote:
> > > Is there no mechanism to support read-only PCIe/NVMe based storage devices?
> > > If that is the case, maybe it's simply better to not support the readonly option
> > > at all for SD express cards?
> > >
> > I think there's no mechanism to support read-only PCIe/NVMe based storage devices.
> 
> I have looped in Christoph, maybe he can give us his opinion on this.

NVMe namespaces can have a bunch of 'write protection' modes advertised
by the controller, which Linux respects.  The controller in this case would
be part of the SD-Card.  IMHO it is a quality of implementation issue
of the SD-Card/Controller to have the the write protection mode of the
namespace(s) match that of the SD interface, and the SD card spec should
talk about that if it doesn't already.

  reply	other threads:[~2020-10-23  9:14 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-25  1:57 [PATCH 3/3] mmc: rtsx: Add SD Express mode support for RTS5261 rui_feng
2020-10-20  6:52 ` 答复: " 冯锐
2020-10-20  8:14   ` Ulf Hansson
2020-10-21 13:59 ` Ulf Hansson
2020-10-22  6:04   ` 答复: " 冯锐
2020-10-23  8:02     ` Ulf Hansson
2020-10-23  9:14       ` Christoph Hellwig [this message]
2020-10-23 12:12         ` Ulf Hansson
2020-10-23 12:18           ` Christoph Hellwig
2020-11-12 16:42           ` Christoph Hellwig
2020-11-17  2:09             ` 冯锐
2020-10-26  8:22       ` 答复: " 冯锐
2020-10-27 12:54         ` Ulf Hansson
2020-10-27 19:37           ` Christoph Hellwig
2020-10-28  2:08           ` 答复: " 冯锐
2020-10-28 10:05           ` 冯锐
2020-10-28 10:18             ` Ulf Hansson

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