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Re: Problems loading firmware using built-in drivers with kernels that use initramfs.

From "Luis R. Rodriguez" <mcgrof@suse.com>
Newsgroups linux.kernel
Subject Re: Problems loading firmware using built-in drivers with kernels that use initramfs.
Date 2015-09-03 01:50 +0200
Message-ID <q4pWV-3dk-7@gated-at.bofh.it> (permalink)
References (7 earlier) <q4lqj-5as-25@gated-at.bofh.it> <q4ns6-8gJ-19@gated-at.bofh.it> <q4ptT-2FO-5@gated-at.bofh.it> <q4pDz-2R2-1@gated-at.bofh.it> <q4pDA-2R2-11@gated-at.bofh.it>
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On Wed, Sep 2, 2015 at 4:29 PM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> On Wed, Sep 2, 2015 at 4:22 PM, Luis R. Rodriguez <mcgrof@suse.com> wrote:
>> On Wed, Sep 02, 2015 at 04:13:51PM -0700, Dmitry Torokhov wrote:
>>> On Wed, Sep 2, 2015 at 2:03 PM, Arend van Spriel <arend@broadcom.com> wrote:
>>> > Ok. So some background why we need it in brcm80211 drivers. So as a wireless
>>> > network device driver the answer we got when asking for an event to load
>>> > firware is upon IF_UP for a registered net device. Because we try to do
>>> > things smart we query the firmware running on the device for capabilities
>>> > before we can register the net device hence we request the firmware during
>>> > probe. This may be specific to wireless drivers (Intel has same approach if
>>> > not mistaken) but I suspect there may be more.
>>>
>>> We have the same issue with input devices: before we can register one
>>> we need to set their capabilities and to know their capabilities we
>>> quite often need to load their firmware/config and query the device.
>>
>> Should Arend's driver use async probe then?
>
> What has async probe have to do with anything? We will still be
> waiting for async probes to finish before we mount rootfs so it will
> not change absolutely anything.

:) Right, its what I was alluding to as well.

>> IMHO its just as hacky as using -EPROBE_DEFER too, but its at least
>> preemptively hacky. Sadly I can't think of clear and clever way for the kernel
>> to know when firmware will be ready either...  Would userspace know? Should the
>> kernel learn this from userspace ?
>
> Yes. Given only userspace knows when firmware is available (I could
> have it on a separate device and mount it at some time). So maybe
> userpsace should simply try and scan busses for unbound devices and
> tell them to re-probe when it decides that firmware is finally
> available.

OK, the folks wanting this mechanism can implement it then. Short of
that we only have hacks.

 Luis
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Thread

Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-08-25 21:40 +0200
  Re: Problems loading firmware using built-in drivers with kernels that use initramfs. Takashi Iwai <tiwai@suse.de> - 2015-08-25 21:50 +0200
    Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-08-25 22:00 +0200
      Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-25 22:30 +0200
        Re: Problems loading firmware using built-in drivers with kernels that use initramfs. yalin wang <yalin.wang2010@gmail.com> - 2015-08-26 07:40 +0200
      RE: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Jie, Yang" <yang.jie@intel.com> - 2015-08-26 07:20 +0200
        Re: Problems loading firmware using built-in drivers with kernels that use initramfs. Takashi Iwai <tiwai@suse.de> - 2015-08-26 07:40 +0200
          RE: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Jie, Yang" <yang.jie@intel.com> - 2015-08-26 08:20 +0200
            Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Liam Girdwood <liam.r.girdwood@linux.intel.com> - 2015-08-26 10:10 +0200
              RE: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Jie, Yang" <yang.jie@intel.com> - 2015-08-26 10:40 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Liam Girdwood <liam.r.girdwood@linux.intel.com> - 2015-08-26 11:10 +0200
                RE: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Lin, Mengdong" <mengdong.lin@intel.com> - 2015-08-27 04:00 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Liam Girdwood <liam.r.girdwood@linux.intel.com> - 2015-08-27 09:10 +0200
              Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-26 20:10 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Ming Lei <ming.lei@canonical.com> - 2015-08-27 03:00 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-08-29 03:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Ming Lei <ming.lei@canonical.com> - 2015-08-29 06:10 +0200
                Re: Problems loading firmware using built-in drivers with kernels that use initramfs. Takashi Iwai <tiwai@suse.de> - 2015-08-29 09:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Arend van Spriel <arend@broadcom.com> - 2015-08-29 11:00 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Ming Lei <ming.lei@canonical.com> - 2015-08-29 12:40 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Arend van Spriel <arend@broadcom.com> - 2015-08-30 10:30 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-30 20:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Ming Lei <ming.lei@canonical.com> - 2015-08-31 16:30 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-09-02 03:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Arend van Spriel <arend@broadcom.com> - 2015-09-02 14:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Arend van Spriel <arend@broadcom.com> - 2015-09-02 14:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-09-02 21:00 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Arend van Spriel <arend@broadcom.com> - 2015-09-02 23:10 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-09-03 01:20 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-09-03 01:30 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-09-03 01:30 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-09-03 01:50 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Arend van Spriel <arend@broadcom.com> - 2015-09-03 19:30 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-09-03 19:40 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-09-02 22:50 +0200
                Re: Problems loading firmware using built-in drivers with kernels  that use initramfs. "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-09-02 02:40 +0200

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