linux-kernel - Re: [PATCH RFC 1/4] firmware: Add the support for ZSTD-compressed firmware files

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Date:   Wed, 17 Feb 2021 14:34:34 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/4] firmware: Add the support for ZSTD-compressed firmware files

On Wed, 17 Feb 2021 14:24:19 +0100,
Luis Chamberlain wrote:
> 
> On Wed, Jan 27, 2021 at 04:49:36PM +0100, Takashi Iwai wrote:
> > Due to the popular demands on ZSTD, here is a patch to add a support
> > of ZSTD-compressed firmware files via the direct firmware loader.
> > It's just like XZ-compressed file support, providing a decompressor
> > with ZSTD.  Since ZSTD API can give the decompression size beforehand,
> > the code is even simpler than XZ.
> > 
> > Signed-off-by: Takashi Iwai <tiwai@...e.de>
> 
> It also occurs to me that having a simple like #define HAVE_FIRMWARE_COMPRESS_ZSTD
> on include/linux/firmware.h would enable userspace to be aware (if they
> have kernel sources) to determine if the kernels supports this format.

Extending that idea, we might want to have a sysfs entry showing the
supported formats instead?  This will allow to judge dynamically.


thanks,

Takashi