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From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Julia Lawall <julia.lawall@lip6.fr>,
	Martijn Coenen <maco@android.com>,
	Andy Gross <andy.gross@linaro.org>,
	David Brown <david.brown@linaro.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
	Peter Jones <pjones@redhat.com>, Dave Olsthoorn <dave@bewaar.me>,
	Will Deacon <will.deacon@arm.com>,
	Andy Lutomirski <luto@kernel.org>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	David Howells <dhowells@redhat.com>,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	Josh Triplett <josh@joshtriplett.org>,
	dmitry.torokhov@gmail.com, mfuzzey@parkeon.com,
	Arend Van Spriel <arend.vanspriel@broadcom.com>,
	nbroeking@me.com, Torsten Duwe <duwe@suse.de>,
	Kees Cook <keescook@chromium.org>,
	x86@kernel.org, linux-efi@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 2/5] efi: Add embedded peripheral firmware support
Date: Thu, 7 Jun 2018 17:57:02 +0200	[thread overview]
Message-ID: <20180607155702.GA5527@wotan.suse.de> (raw)
In-Reply-To: <4cb520a0-d3c8-477d-5d05-7b05637f5faf@redhat.com>

On Thu, Jun 07, 2018 at 03:46:11PM +0200, Hans de Goede wrote:
> On 06-06-18 23:42, Luis R. Rodriguez wrote:
> > On Wed, Jun 06, 2018 at 08:39:15PM +0200, Hans de Goede wrote:
> > > On 05-06-18 23:07, Luis R. Rodriguez wrote:
> > > 2) Should this flag then be checked inside _request_firmware() before it
> > > calls fw_get_efi_embedded_fw() (which may be an empty stub),
> > 
> > You are the architect behind this call, so its up to you.
> > 
> > To answer this you have to review the other flags and see if other users of the
> > other flags may want your functionality. For instance the Android folks for
> > instance rely on the FW_OPT_NOFALLBACK - the sysfs fallback mechanism to
> > account for odd partition layouts. Could they ever want to use your fallback
> > mechanism? Granted your mechanism is for x86, but they could eventually add
> > support for it on ARM.
> > 
> > Checking if the firmware is on the EFI platform firmware list is much faster
> > than the fallback mechanism, that would be one gain for them, as such it may
> > make sense to check for firmware_request_platform() before using the sysfs
> > fallback mechanism.  However if Android folks want to always override the
> > platform firmware with the sysfs fallback interface we'd need another flag
> > added and call to then change the order later if we checked for for the
> > platform firmware first.
> 
> I believe we agreed a while back that the platform fallback would
> replace the sysfs one when requested. I believe that still makes
> sense. If a driver wants both it can simply call request_firmware_foo
> itself twice and determine the order itself.

Fine by me, so in your case the syfs fallback will be ignored.

Which gets me thinking that perhaps we should have a separate
syfs fallback call. There are only two drivers that use it
explicitly:

  o CONFIG_LEDS_LP55XX_COMMON
	request_firmware_nowait(THIS_MODULE, false, ...);
  o CONFIG_DELL_RBU
	request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, ...)

And FW_ACTION_NOHOTPLUG is 0.

The above revelation of the async call being data driven is a good
opportunity to break that tradition to the more preferred functional
one. And so we'd also get rid of the FW_ACTION_NOHOTPLUG option
all together.

So a new firmware_request_sysfs_async() I suppose.

  Luis

  reply	other threads:[~2018-06-07 15:57 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-01 12:53 [PATCH v6 0/5] efi/firmware/platform-x86: Add EFI embedded fw support Hans de Goede
2018-06-01 12:53 ` [PATCH v6 1/5] efi: Export boot-services code and data as debugfs-blobs Hans de Goede
2018-06-01 12:53 ` [PATCH v6 2/5] efi: Add embedded peripheral firmware support Hans de Goede
2018-06-01 23:40   ` Randy Dunlap
2018-06-05 21:07   ` Luis R. Rodriguez
2018-06-06 18:39     ` Hans de Goede
2018-06-06 21:42       ` Luis R. Rodriguez
2018-06-07 13:46         ` Hans de Goede
2018-06-07 15:57           ` Luis R. Rodriguez [this message]
2018-06-01 12:53 ` [PATCH v6 3/5] platform/x86: Rename silead_dmi to touchscreen_dmi Hans de Goede
2018-06-01 12:53 ` [PATCH v6 4/5] platform/x86: touchscreen_dmi: Add EFI embedded firmware info support Hans de Goede
2018-06-01 12:53 ` [PATCH v6 5/5] platform/x86: touchscreen_dmi: Add info for the Chuwi Vi8 Plus tablet Hans de Goede
2018-06-02  3:39 ` [PATCH v6 0/5] efi/firmware/platform-x86: Add EFI embedded fw support Andy Lutomirski
2018-06-03 16:39   ` Ard Biesheuvel
2018-06-05 20:46 ` Luis R. Rodriguez
2018-06-06 18:17   ` Hans de Goede
2018-06-06 18:35     ` Luis R. Rodriguez
2018-06-06 18:40     ` Andy Lutomirski

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