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From: Laszlo Ersek <lersek-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: "Gerd Hoffmann" <kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Marc Marí" <markmb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Stefan Hajnoczi
	<stefanha-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-kernel
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Drew <drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Kevin O'Connor <kevin-BG7uPxbsK//k1uMJSBkQmQ@public.gmane.org>,
	Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
	Rob Herring <rob.herring-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v2] QEMU fw_cfg DMA interface documentation
Date: Mon, 7 Sep 2015 13:25:20 +0200	[thread overview]
Message-ID: <55ED7420.9080803@redhat.com> (raw)
In-Reply-To: <1441624109.27149.18.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On 09/07/15 13:08, Gerd Hoffmann wrote:
>   Hi,
> 
>> It's just simplicity. If you want to read a few times from the same
>> field (like in ACPI tables, read the data size and then the data), you
>> need a way to enable and disable the selector and manage the current
>> offset for that entry. This is already provided with the "old"
>> interface.
> 
> Could be handled with a 'select' control bit.  Only when set select
> entry and reset offset to zero.
> 
> Also: would it make sense to allow an *array* of FWCfgDmaAccess structs?
> With a 'more' bit in control we could indicate that there are more
> entries.  I'm not sure firmware would actually use that though ...

Seems far-fetched.

Thanks
Laszlo

> cheers,
>   Gerd
> 
> 

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  parent reply	other threads:[~2015-09-07 11:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-31  9:08 QEMU fw_cfg DMA interface Marc Marí
     [not found] ` <1441012133-8154-1-git-send-email-markmb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-08-31  9:11   ` [PATCH v2] QEMU fw_cfg DMA interface documentation Marc Marí
2015-09-02  8:20     ` Stefan Hajnoczi
     [not found]       ` <CAJSP0QXgiMo0ahzRQ=2iMXVmiO+R27Re17c966LX1T_Q=Rdgow-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-02  8:33         ` Marc Marí
2015-09-07 11:08           ` Gerd Hoffmann
     [not found]             ` <1441624109.27149.18.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-07 11:25               ` Laszlo Ersek [this message]
2015-09-08 16:46             ` Kevin O'Connor
2015-09-10 14:21               ` Marc Marí

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