I wanted to deal with https://bugzilla.redhat.com/2043498 and I got a
suggesstion that removing deprecated features could actually make it
easier to propagate the error.  In the end (last patch) it turns out the
error is still just reported with error_fatal, so it probably is not
really needed, but I really wanted to dig into QEMU more and learn some
of the internals for quite some time now.  So I used the opportunity.
The one-liner ended up being an 18 patch series which was, for someone
who has just one commit in QEMU codebase, a pretty challenging task.
Although I tried my best to do things properly, I am not sure whether I
handled everything correctly, hence the RFC.

Any comments are very much appreciated.  Thanks and have a nice day ;)

Martin Kletzander (18):
  hw/audio: Remove -soundhw support
  hw/input/tsc210x: Extract common init code into new function
  hw/audio: Simplify hda audio init
  hw/audio/lm4549: Add errp error reporting to init function
  tests/qtest: Specify audiodev= and -audiodev
  ui/vnc: Require audiodev=
  Introduce machine's default-audiodev property
  audio: Add easy dummy audio initialiser
  hw/display/xlnx_dp.c: Add audiodev property
  hw/input/tsc210x.c: Support machine-default audiodev with fallback
  hw/arm: Support machine-default audiodev with fallback
  hw/ppc: Support machine-default audiodev with fallback
  audio: Make AUD_register_card fallible and require audiodev=
  audio: Require AudioState in AUD_add_capture
  audio: Be more strict during audio backend initialisation
  audio: Remove legacy audio environment variables and options
  audio: Remove unused can_be_default
  audio/spiceaudio: Fail initialisation when not using spice

 audio/alsaaudio.c                             |   1 -
 audio/audio.c                                 | 204 +++----
 audio/audio.h                                 |   5 +-
 audio/audio_int.h                             |   1 -
 audio/audio_legacy.c                          | 555 ------------------
 audio/coreaudio.m                             |   1 -
 audio/dbusaudio.c                             |   1 -
 audio/dsoundaudio.c                           |   1 -
 audio/jackaudio.c                             |   1 -
 audio/meson.build                             |   1 -
 audio/noaudio.c                               |   1 -
 audio/ossaudio.c                              |   1 -
 audio/paaudio.c                               |   1 -
 audio/sdlaudio.c                              |   1 -
 audio/spiceaudio.c                            |   3 +-
 audio/wavaudio.c                              |   1 -
 docs/about/deprecated.rst                     |  24 -
 docs/about/removed-features.rst               |  27 +
 docs/qdev-device-use.txt                      |  21 +-
 docs/replay.txt                               |   2 +-
 hw/arm/integratorcp.c                         |   8 +-
 hw/arm/musicpal.c                             |   8 +-
 hw/arm/omap2.c                                |  11 +-
 hw/arm/realview.c                             |   3 +
 hw/arm/spitz.c                                |  10 +-
 hw/arm/versatilepb.c                          |   3 +
 hw/arm/vexpress.c                             |   3 +
 hw/arm/xlnx-zcu102.c                          |   4 +
 hw/arm/z2.c                                   |  12 +-
 hw/audio/ac97.c                               |   9 +-
 hw/audio/adlib.c                              |   9 +-
 hw/audio/cs4231a.c                            |   8 +-
 hw/audio/es1370.c                             |   8 +-
 hw/audio/gus.c                                |   6 +-
 hw/audio/hda-codec.c                          |  37 +-
 hw/audio/intel-hda.c                          |  25 +-
 hw/audio/intel-hda.h                          |   2 +-
 hw/audio/lm4549.c                             |   7 +-
 hw/audio/lm4549.h                             |   3 +-
 hw/audio/meson.build                          |   1 -
 hw/audio/pcspk.c                              |  15 +-
 hw/audio/pl041.c                              |   2 +-
 hw/audio/sb16.c                               |   9 +-
 hw/audio/soundhw.c                            | 177 ------
 hw/audio/wm8750.c                             |   5 +-
 hw/core/machine.c                             |  23 +
 hw/display/xlnx_dp.c                          |  12 +-
 hw/input/tsc210x.c                            |  79 ++-
 hw/ppc/prep.c                                 |   4 +
 hw/usb/dev-audio.c                            |   5 +-
 include/hw/audio/soundhw.h                    |  15 -
 include/hw/boards.h                           |   1 +
 qemu-options.hx                               |  37 --
 .../codeconverter/test_regexps.py             |   1 -
 softmmu/qdev-monitor.c                        |   2 -
 softmmu/vl.c                                  |  10 -
 tests/qtest/ac97-test.c                       |   3 +-
 tests/qtest/es1370-test.c                     |   3 +-
 tests/qtest/fuzz/generic_fuzz_configs.h       |   6 +-
 tests/qtest/intel-hda-test.c                  |  15 +-
 ui/vnc.c                                      |  15 +-
 61 files changed, 329 insertions(+), 1140 deletions(-)
 delete mode 100644 audio/audio_legacy.c
 delete mode 100644 hw/audio/soundhw.c
 delete mode 100644 include/hw/audio/soundhw.h

-- 
2.35.1

On 25/04/2022 09:21, Martin Kletzander wrote:

> I wanted to deal with https://bugzilla.redhat.com/2043498 and I got a
> suggesstion that removing deprecated features could actually make it
> easier to propagate the error.  In the end (last patch) it turns out the
> error is still just reported with error_fatal, so it probably is not
> really needed, but I really wanted to dig into QEMU more and learn some
> of the internals for quite some time now.  So I used the opportunity.
> The one-liner ended up being an 18 patch series which was, for someone
> who has just one commit in QEMU codebase, a pretty challenging task.
> Although I tried my best to do things properly, I am not sure whether I
> handled everything correctly, hence the RFC.
> 
> Any comments are very much appreciated.  Thanks and have a nice day ;)
> 
> Martin Kletzander (18):
>    hw/audio: Remove -soundhw support
>    hw/input/tsc210x: Extract common init code into new function
>    hw/audio: Simplify hda audio init
>    hw/audio/lm4549: Add errp error reporting to init function
>    tests/qtest: Specify audiodev= and -audiodev
>    ui/vnc: Require audiodev=
>    Introduce machine's default-audiodev property
>    audio: Add easy dummy audio initialiser
>    hw/display/xlnx_dp.c: Add audiodev property
>    hw/input/tsc210x.c: Support machine-default audiodev with fallback
>    hw/arm: Support machine-default audiodev with fallback
>    hw/ppc: Support machine-default audiodev with fallback
>    audio: Make AUD_register_card fallible and require audiodev=
>    audio: Require AudioState in AUD_add_capture
>    audio: Be more strict during audio backend initialisation
>    audio: Remove legacy audio environment variables and options
>    audio: Remove unused can_be_default
>    audio/spiceaudio: Fail initialisation when not using spice
> 
>   audio/alsaaudio.c                             |   1 -
>   audio/audio.c                                 | 204 +++----
>   audio/audio.h                                 |   5 +-
>   audio/audio_int.h                             |   1 -
>   audio/audio_legacy.c                          | 555 ------------------
>   audio/coreaudio.m                             |   1 -
>   audio/dbusaudio.c                             |   1 -
>   audio/dsoundaudio.c                           |   1 -
>   audio/jackaudio.c                             |   1 -
>   audio/meson.build                             |   1 -
>   audio/noaudio.c                               |   1 -
>   audio/ossaudio.c                              |   1 -
>   audio/paaudio.c                               |   1 -
>   audio/sdlaudio.c                              |   1 -
>   audio/spiceaudio.c                            |   3 +-
>   audio/wavaudio.c                              |   1 -
>   docs/about/deprecated.rst                     |  24 -
>   docs/about/removed-features.rst               |  27 +
>   docs/qdev-device-use.txt                      |  21 +-
>   docs/replay.txt                               |   2 +-
>   hw/arm/integratorcp.c                         |   8 +-
>   hw/arm/musicpal.c                             |   8 +-
>   hw/arm/omap2.c                                |  11 +-
>   hw/arm/realview.c                             |   3 +
>   hw/arm/spitz.c                                |  10 +-
>   hw/arm/versatilepb.c                          |   3 +
>   hw/arm/vexpress.c                             |   3 +
>   hw/arm/xlnx-zcu102.c                          |   4 +
>   hw/arm/z2.c                                   |  12 +-
>   hw/audio/ac97.c                               |   9 +-
>   hw/audio/adlib.c                              |   9 +-
>   hw/audio/cs4231a.c                            |   8 +-
>   hw/audio/es1370.c                             |   8 +-
>   hw/audio/gus.c                                |   6 +-
>   hw/audio/hda-codec.c                          |  37 +-
>   hw/audio/intel-hda.c                          |  25 +-
>   hw/audio/intel-hda.h                          |   2 +-
>   hw/audio/lm4549.c                             |   7 +-
>   hw/audio/lm4549.h                             |   3 +-
>   hw/audio/meson.build                          |   1 -
>   hw/audio/pcspk.c                              |  15 +-
>   hw/audio/pl041.c                              |   2 +-
>   hw/audio/sb16.c                               |   9 +-
>   hw/audio/soundhw.c                            | 177 ------
>   hw/audio/wm8750.c                             |   5 +-
>   hw/core/machine.c                             |  23 +
>   hw/display/xlnx_dp.c                          |  12 +-
>   hw/input/tsc210x.c                            |  79 ++-
>   hw/ppc/prep.c                                 |   4 +
>   hw/usb/dev-audio.c                            |   5 +-
>   include/hw/audio/soundhw.h                    |  15 -
>   include/hw/boards.h                           |   1 +
>   qemu-options.hx                               |  37 --
>   .../codeconverter/test_regexps.py             |   1 -
>   softmmu/qdev-monitor.c                        |   2 -
>   softmmu/vl.c                                  |  10 -
>   tests/qtest/ac97-test.c                       |   3 +-
>   tests/qtest/es1370-test.c                     |   3 +-
>   tests/qtest/fuzz/generic_fuzz_configs.h       |   6 +-
>   tests/qtest/intel-hda-test.c                  |  15 +-
>   ui/vnc.c                                      |  15 +-
>   61 files changed, 329 insertions(+), 1140 deletions(-)
>   delete mode 100644 audio/audio_legacy.c
>   delete mode 100644 hw/audio/soundhw.c
>   delete mode 100644 include/hw/audio/soundhw.h

Thanks for the tidy-up! I'm not too familiar with the audio code, however one thing I 
noticed is that in patch 11 you are using qdev_prop_set_string() to set the audiodev 
for the machines.

For CharDevs there already exists a qdev_prop_set_chr() function which is used to 
assign the chardev backend to the device, so I'm wondering if it makes sense to add a 
similar qdev_prop_set_audiodev() function in the same way? Then if the method of 
referencing the audiodev from the device ever changes from being a string containing 
the name, it won't require updating all of the callers.

Finally a quick glance at the tsc210x and lm4549 devices indicates that they are 
using global device _init() functions which shouldn't really be used in modern 
implementations. If you are interested in QOMify-ing these devices as part of this 
work, then I can certainly help provide some pointers for getting started.


ATB,

Mark.

On Mon, Apr 25, 2022 at 06:05:56PM +0100, Mark Cave-Ayland wrote:
>On 25/04/2022 09:21, Martin Kletzander wrote:
>
>> I wanted to deal with https://bugzilla.redhat.com/2043498 and I got a
>> suggesstion that removing deprecated features could actually make it
>> easier to propagate the error.  In the end (last patch) it turns out the
>> error is still just reported with error_fatal, so it probably is not
>> really needed, but I really wanted to dig into QEMU more and learn some
>> of the internals for quite some time now.  So I used the opportunity.
>> The one-liner ended up being an 18 patch series which was, for someone
>> who has just one commit in QEMU codebase, a pretty challenging task.
>> Although I tried my best to do things properly, I am not sure whether I
>> handled everything correctly, hence the RFC.
>>
>> Any comments are very much appreciated.  Thanks and have a nice day ;)
>>
>> Martin Kletzander (18):
>>    hw/audio: Remove -soundhw support
>>    hw/input/tsc210x: Extract common init code into new function
>>    hw/audio: Simplify hda audio init
>>    hw/audio/lm4549: Add errp error reporting to init function
>>    tests/qtest: Specify audiodev= and -audiodev
>>    ui/vnc: Require audiodev=
>>    Introduce machine's default-audiodev property
>>    audio: Add easy dummy audio initialiser
>>    hw/display/xlnx_dp.c: Add audiodev property
>>    hw/input/tsc210x.c: Support machine-default audiodev with fallback
>>    hw/arm: Support machine-default audiodev with fallback
>>    hw/ppc: Support machine-default audiodev with fallback
>>    audio: Make AUD_register_card fallible and require audiodev=
>>    audio: Require AudioState in AUD_add_capture
>>    audio: Be more strict during audio backend initialisation
>>    audio: Remove legacy audio environment variables and options
>>    audio: Remove unused can_be_default
>>    audio/spiceaudio: Fail initialisation when not using spice
>>

[...]

>
>Thanks for the tidy-up! I'm not too familiar with the audio code, however one thing I
>noticed is that in patch 11 you are using qdev_prop_set_string() to set the audiodev
>for the machines.
>
>For CharDevs there already exists a qdev_prop_set_chr() function which is used to
>assign the chardev backend to the device, so I'm wondering if it makes sense to add a
>similar qdev_prop_set_audiodev() function in the same way? Then if the method of
>referencing the audiodev from the device ever changes from being a string containing
>the name, it won't require updating all of the callers.
>

I guess that could be possible, but I'm not familiar with QEMU code much
and to be honest have no idea how I would go about doing that right now.

>Finally a quick glance at the tsc210x and lm4549 devices indicates that they are
>using global device _init() functions which shouldn't really be used in modern
>implementations. If you are interested in QOMify-ing these devices as part of this
>work, then I can certainly help provide some pointers for getting started.
>

I thought about it for some devices.  Not all the devices I touched
here, because I feel like that would lead to a rabbit hole.  And 18
patches just because I wanted to error out in one condition was already
too much =)  But I'll be glad for any pointers on where to start and how
should I get to it.  Thanks.

>
>ATB,
>
>Mark.
>

On Mon, Apr 25, 2022 at 10:21:43AM +0200, Martin Kletzander wrote:
> I wanted to deal with https://bugzilla.redhat.com/2043498 and I got a
> suggesstion that removing deprecated features could actually make it
> easier to propagate the error.  In the end (last patch) it turns out the
> error is still just reported with error_fatal, so it probably is not
> really needed, but I really wanted to dig into QEMU more and learn some
> of the internals for quite some time now.  So I used the opportunity.
> The one-liner ended up being an 18 patch series which was, for someone
> who has just one commit in QEMU codebase, a pretty challenging task.
> Although I tried my best to do things properly, I am not sure whether I
> handled everything correctly, hence the RFC.
> 
> Any comments are very much appreciated.  Thanks and have a nice day ;)

Hi Martin,
The -soundhw removal looks good to me. I'm not familiar with the audio
subsystem so I didn't review the rest.

Stefan

On 4/25/22 10:21, Martin Kletzander wrote:
> I wanted to deal with https://bugzilla.redhat.com/2043498 and I got a
> suggesstion that removing deprecated features could actually make it
> easier to propagate the error.  In the end (last patch) it turns out the
> error is still just reported with error_fatal, so it probably is not
> really needed, but I really wanted to dig into QEMU more and learn some
> of the internals for quite some time now.  So I used the opportunity.
> The one-liner ended up being an 18 patch series which was, for someone
> who has just one commit in QEMU codebase, a pretty challenging task.
> Although I tried my best to do things properly, I am not sure whether I
> handled everything correctly, hence the RFC.

Rebased and queued what's left...  It took a while. :)

Paolo

> Martin Kletzander (18):
>    hw/audio: Remove -soundhw support
>    hw/input/tsc210x: Extract common init code into new function
>    hw/audio: Simplify hda audio init
>    hw/audio/lm4549: Add errp error reporting to init function
>    tests/qtest: Specify audiodev= and -audiodev
>    ui/vnc: Require audiodev=
>    Introduce machine's default-audiodev property
>    audio: Add easy dummy audio initialiser
>    hw/display/xlnx_dp.c: Add audiodev property
>    hw/input/tsc210x.c: Support machine-default audiodev with fallback
>    hw/arm: Support machine-default audiodev with fallback
>    hw/ppc: Support machine-default audiodev with fallback
>    audio: Make AUD_register_card fallible and require audiodev=
>    audio: Require AudioState in AUD_add_capture
>    audio: Be more strict during audio backend initialisation
>    audio: Remove legacy audio environment variables and options
>    audio: Remove unused can_be_default
>    audio/spiceaudio: Fail initialisation when not using spice
> 
>   audio/alsaaudio.c                             |   1 -
>   audio/audio.c                                 | 204 +++----
>   audio/audio.h                                 |   5 +-
>   audio/audio_int.h                             |   1 -
>   audio/audio_legacy.c                          | 555 ------------------
>   audio/coreaudio.m                             |   1 -
>   audio/dbusaudio.c                             |   1 -
>   audio/dsoundaudio.c                           |   1 -
>   audio/jackaudio.c                             |   1 -
>   audio/meson.build                             |   1 -
>   audio/noaudio.c                               |   1 -
>   audio/ossaudio.c                              |   1 -
>   audio/paaudio.c                               |   1 -
>   audio/sdlaudio.c                              |   1 -
>   audio/spiceaudio.c                            |   3 +-
>   audio/wavaudio.c                              |   1 -
>   docs/about/deprecated.rst                     |  24 -
>   docs/about/removed-features.rst               |  27 +
>   docs/qdev-device-use.txt                      |  21 +-
>   docs/replay.txt                               |   2 +-
>   hw/arm/integratorcp.c                         |   8 +-
>   hw/arm/musicpal.c                             |   8 +-
>   hw/arm/omap2.c                                |  11 +-
>   hw/arm/realview.c                             |   3 +
>   hw/arm/spitz.c                                |  10 +-
>   hw/arm/versatilepb.c                          |   3 +
>   hw/arm/vexpress.c                             |   3 +
>   hw/arm/xlnx-zcu102.c                          |   4 +
>   hw/arm/z2.c                                   |  12 +-
>   hw/audio/ac97.c                               |   9 +-
>   hw/audio/adlib.c                              |   9 +-
>   hw/audio/cs4231a.c                            |   8 +-
>   hw/audio/es1370.c                             |   8 +-
>   hw/audio/gus.c                                |   6 +-
>   hw/audio/hda-codec.c                          |  37 +-
>   hw/audio/intel-hda.c                          |  25 +-
>   hw/audio/intel-hda.h                          |   2 +-
>   hw/audio/lm4549.c                             |   7 +-
>   hw/audio/lm4549.h                             |   3 +-
>   hw/audio/meson.build                          |   1 -
>   hw/audio/pcspk.c                              |  15 +-
>   hw/audio/pl041.c                              |   2 +-
>   hw/audio/sb16.c                               |   9 +-
>   hw/audio/soundhw.c                            | 177 ------
>   hw/audio/wm8750.c                             |   5 +-
>   hw/core/machine.c                             |  23 +
>   hw/display/xlnx_dp.c                          |  12 +-
>   hw/input/tsc210x.c                            |  79 ++-
>   hw/ppc/prep.c                                 |   4 +
>   hw/usb/dev-audio.c                            |   5 +-
>   include/hw/audio/soundhw.h                    |  15 -
>   include/hw/boards.h                           |   1 +
>   qemu-options.hx                               |  37 --
>   .../codeconverter/test_regexps.py             |   1 -
>   softmmu/qdev-monitor.c                        |   2 -
>   softmmu/vl.c                                  |  10 -
>   tests/qtest/ac97-test.c                       |   3 +-
>   tests/qtest/es1370-test.c                     |   3 +-
>   tests/qtest/fuzz/generic_fuzz_configs.h       |   6 +-
>   tests/qtest/intel-hda-test.c                  |  15 +-
>   ui/vnc.c                                      |  15 +-
>   61 files changed, 329 insertions(+), 1140 deletions(-)
>   delete mode 100644 audio/audio_legacy.c
>   delete mode 100644 hw/audio/soundhw.c
>   delete mode 100644 include/hw/audio/soundhw.h
>