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From: Gerd Hoffmann <kraxel@redhat.com>
To: "Marc Marí" <markmb@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Drew <drjones@redhat.com>, Kevin O'Connor <kevin@koconnor.net>,
	Laszlo <lersek@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
	Rob Herring <rob.herring@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Graf <agraf@suse.de>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v2] QEMU fw_cfg DMA interface documentation
Date: Mon, 07 Sep 2015 13:08:29 +0200	[thread overview]
Message-ID: <1441624109.27149.18.camel@redhat.com> (raw)
In-Reply-To: <20150902103311.5335d469@markmb_rh>

  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 ...

cheers,
  Gerd

  reply	other threads:[~2015-09-07 11:08 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-31  9:08 QEMU fw_cfg DMA interface Marc Marí
2015-08-31  9:08 ` [Qemu-devel] " Marc Marí
2015-08-31  9:08 ` Marc Marí
2015-08-31  9:10 ` [Qemu-devel] [PATCH v2 0/5] " Marc Marí
2015-08-31  9:10   ` [Qemu-devel] [PATCH v2 1/5] fw_cfg: document fw_cfg_modify_iXX() update functions Marc Marí
2015-09-01 17:33     ` Peter Maydell
2015-09-01 17:45       ` Gabriel L. Somlo
2015-09-01 18:45         ` Peter Maydell
2015-09-01 19:13           ` Gabriel L. Somlo
2015-09-01 20:10             ` Peter Maydell
2015-09-01 20:27               ` Gabriel L. Somlo
2015-09-01 20:30                 ` Peter Maydell
2015-09-02  8:08               ` Gerd Hoffmann
2015-09-02  9:21                 ` Laszlo Ersek
2015-08-31  9:10   ` [Qemu-devel] [PATCH v2 2/5] fw_cfg DMA interface documentation Marc Marí
2015-08-31 15:36     ` Kevin O'Connor
2015-09-01 17:47     ` Peter Maydell
2015-09-01 17:56       ` Peter Maydell
2015-08-31  9:10   ` [Qemu-devel] [PATCH v2 3/5] Implement fw_cfg DMA interface Marc Marí
2015-08-31 15:58     ` Kevin O'Connor
2015-09-01 18:35     ` Peter Maydell
2015-08-31  9:10   ` [Qemu-devel] [PATCH v2 4/5] Enable fw_cfg DMA interface for ARM Marc Marí
2015-09-01 18:02     ` Peter Maydell
2015-08-31  9:10   ` [Qemu-devel] [PATCH v2 5/5] Enable fw_cfg DMA interface for x86 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
2015-08-31  9:11     ` 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
2015-09-02  8:33           ` Marc Marí
2015-09-07 11:08           ` Gerd Hoffmann [this message]
     [not found]             ` <1441624109.27149.18.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-07 11:25               ` Laszlo Ersek
2015-09-07 11:25                 ` Laszlo Ersek
2015-09-08 16:46             ` Kevin O'Connor
2015-09-10 14:21               ` Marc Marí

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