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[SCHMITT Olivier <1895833@xxxxxxxxxxxxxxxxxx>]

** Also affects: alsa-lib
   Importance: Undecided
       Status: New

** Also affects: alsa-utils
   Importance: Undecided
       Status: New

** Also affects: alsa-lib (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: alsa-utils (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1895833

Title:
  unblock restrictions on alsa (max id of card and sample rate for alsa
  Loopback)

Status in ALSA Libraries:
  New
Status in Alsa utilities:
  New
Status in Ubuntu:
  New
Status in alsa-lib package in Ubuntu:
  New
Status in alsa-utils package in Ubuntu:
  New

Bug description:
  SRU Justification:

  [Impact] kernel, alsa-lib, alsa-utils
  We are using more and more cards recognized as sound peripherals. When the number of loopback and hardware cards exceeds 32, we can no longer use them.
  Also some new devices are already using 384khz but the limitation is for alsa Loopback.

  I thinks we must increse CONFIG_SND_MAX_CARDS to 256 and change 192000
  sample rate value fixed in aloop.c to 384000 or 768000 to provide an
  additional margin in alsa Loopback.

  [Test Case]

  sudo add-apt-repository -y universe
  apt-get update && sudo apt-get upgrade -y
  sudo apt-get install alsa alsa-*

  shutdown -r now

  sudo modprobe snd-aloop
  sudo echo snd-aloop >> /etc/modules
  sudo adduser $(whoami) audio

  shutdown -r now

  sudo apt-get install -y apt-get install alsa alsa-utils libasound2-dev
  sudo apt-get install -y screen build-essential initramfs-tools fakeroot debconf-utils dpkg-dev debhelper bin86 flex bison pkgconf dkms python3-docutils \
  libudev-dev mt-st cpufrequtils libpci-dev libssl-dev libiberty-dev libcap-dev asciidoc default-jdk libncurses-dev \
  kernel-package kernel-wedge libnvpair1linux libuutil1linux libzfs2linux libzpool2linux zfs-dkms zfs-zed zfsutils-linux \
  crash makedumpfile  libncurses5 libncurses5-dev libelf-dev  binutils-dev kexec-tools 

  screen

  mkdir ~/megamod
  cd ~/megamod
  git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git
  cd ubuntu-focal
  sed -i 's/SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000,/SNDRV_PCM_RATE_CONTINUOUS,/g' ./sound/drivers/aloop.c
  sed -i 's/192000/768000/g' ./sound/drivers/aloop.c
  grep -rnl './' -e "CONFIG_SND_MAX_CARDS=32" | xargs -i@ sed -i 's/CONFIG_SND_MAX_CARDS=32/CONFIG_SND_MAX_CARDS=256/g' @

  search and replace 32 by 256 in  and
  ./debian.master/config/annotations  for  CONFIG_SND_MAX_CARDS

  fakeroot debian/rules clean
  fakeroot debian/rules binary


  dpkg -i ../linux*5.4.0-*.deb

  shutdown -r now

  sudo systemctl disable hv-kvp-daemon.service

  ####################

  echo "options snd-aloop \"  >> /etc/modprobe.d/alsa-base.conf
  echo "index=10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45 \"  >> /etc/modprobe.d/alsa-base.conf
  echo "id=lp0,lp1,lp2,lp3,lp4,lp5,lp6,lp7,lp8,lp9,lp10,lp11,lp12,lp13,lp14,lp15,lp16,lp17,lp18,lp19,lp20,lp21,lp22,lp23,lp24,lp25,lp26,lp27,lp28,lp29,lp30,lp31,lp32,lp33,lp34,lp35 \"  >> /etc/modprobe.d/alsa-base.conf
  echo "enable=1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 \"  >> /etc/modprobe.d/alsa-base.conf
  echo "pcm_substreams=2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2"  >> /etc/modprobe.d/alsa-base.conf

  sudo su
  sudo mkdir /usr/src/alsa
  cd /usr/src/alsa
  git clone git://git.alsa-project.org/alsa-lib.git alsa-lib
  cd /usr/src/alsa/alsa-lib
  ./gitcompile --with-max-cards=256
  make install

  cp /usr/lib/libasound* /usr/lib/x86_64-linux-gnu/
   
  cd /usr/src/alsa
  git clone git://git.alsa-project.org/alsa-utils.git alsa-utils
  cd /usr/src/alsa/alsa-utils
  ./gitcompile --with-max-cards=256
  make install

  shutdown -r now

  [Regression Potential]

  * The regression can be considered as low, because this is because
  it's functional since 16.04

  [Other]

  * This requires a patch to be included into the kernel, alsa-lib and
  alsa-utils package.  - please see [Test Case] description for more
  details.

  * changes can be made independently and have no impact on others

  [Patch]

  In /sound/drivers/aloop.c:
  L555	.rates =	SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000,
  to
  L555	.rates =	SNDRV_PCM_RATE_CONTINUOUS,

  In /sound/drivers/aloop.c:
  L557		.rate_max =		192000,
  to
  L557		.rate_max =		768000,

  
  In /sound/drivers/aloop.c:
  L557	uinfo->value.integer.max = 192000;
  to
  L557	uinfo->value.integer.max = 768000;

  In /debian.master/config/config.common.ubuntu
  L9069 CONFIG_SND_MAX_CARDS=32
  to
  L9069 CONFIG_SND_MAX_CARDS=256

  and update debian.master/rules.d/hooks.mk

  For alsa-lib and alsa-util, package can be simply update with
  ./gitcompile --with-max-cards=256

  Thanks everybody

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