linux-kernel - Re: [PATCH 2/3] firmware: add offset to request_firmware_into

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Message-ID: <20190819222242.GT16384@42.do-not-panic.com>
Date:   Mon, 19 Aug 2019 22:22:42 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH 2/3] firmware: add offset to request_firmware_into_buf

On Thu, Aug 01, 2019 at 11:15:19AM -0700, Scott Branden wrote:
> Hi Luis,
> 
> On 2019-08-01 10:42 a.m., Luis Chamberlain wrote:
> > On Thu, Aug 01, 2019 at 08:18:01AM +0200, Greg Kroah-Hartman wrote:
> > > On Wed, Jul 31, 2019 at 05:18:32PM -0700, Scott Branden wrote:
> > > > Hi Greg,
> > > > 
> > > > I am now back from leave to continue this patch.  Comment below.
> > > > 
> > > > On 2019-05-23 10:22 p.m., Greg Kroah-Hartman wrote:
> > > > > On Thu, May 23, 2019 at 10:01:38PM -0700, Scott Branden wrote:
> > > > > > On 2019-05-23 9:54 a.m., Greg Kroah-Hartman wrote:
> > > > > > > On Thu, May 23, 2019 at 09:36:02AM -0700, Scott Branden wrote:
> > > > > > > > Hi Greg,
> > > > > > > > 
> > > > > > > > On 2019-05-22 10:52 p.m., Greg Kroah-Hartman wrote:
> > > > > > > > > On Wed, May 22, 2019 at 07:51:12PM -0700, Scott Branden wrote:
> > > > > > > > > > Add offset to request_firmware_into_buf to allow for portions
> > > > > > > > > > of firmware file to be read into a buffer.  Necessary where firmware
> > > > > > > > > > needs to be loaded in portions from file in memory constrained systems.
> > > > > > > > > > 
> > > > > > > > > > Signed-off-by: Scott Branden <scott.branden@...adcom.com>
> > > > > > > > > > ---
> > > > > > > > > >      drivers/base/firmware_loader/firmware.h |  5 +++
> > > > > > > > > >      drivers/base/firmware_loader/main.c     | 49 +++++++++++++++++--------
> > > > > > > > > >      include/linux/firmware.h                |  8 +++-
> > > > > > > > > >      3 files changed, 45 insertions(+), 17 deletions(-)
> > > > > > > > > No new firmware test for this new option?  How do we know it even works?
> > > > > > > > I was unaware there are existing firmware tests.  Please let me know where
> > > > > > > > these tests exists and I can add a test for this new option.
> > > > > > > tools/testing/selftests/firmware/
> > > > > > Unfortunately, there doesn't seem to be a test for the existing
> > > > > > request_firmware_into_buf api.
> > > > > Are you sure?  The test is for userspace functionality, there isn't
> > > > > kernel unit tests here.  You need to verify that you didn't break
> > > > > existing functionality as well as verify that your new functionality
> > > > > works.
> > > > I managed to figure out how to build and run
> > > > tools/testing/selftest/firmware/fw_run_tests.sh
> > > > 
> > > > and my changes don't break existing functionality.
> > I'm soon going to release something that is going to let you do this
> > faster and easier, let me know if you had troubles in trying to figure
> > out how to not regress the kernel using this.
> 
> Yes, I had troubles in trying to figure it out.  The kernel build should
> 
> create an entire initrd with all the necessary components in it for testing
> purposes.
> 
> And the firmware test will now take me some time to figure out how it all
> works.
> 
> Could you please explain what you are going to release soon?  I don't want
> to waste

Sorry for the delay but I promise that I tried hard to get this out ASAP.

https://github.com/mcgrof/fw-kdevops

This now can be used to more easily let you start an environment to
test the firmware API.

Too late for you I gather, but perhaps others can take advantage.

  Luis