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https://bugs.launchpad.net/bugs/1806766

Title:
  [Regression] crashkernel fails on HiSilicon D05

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released
Status in linux source package in Disco:
  Fix Released

Bug description:
  [Impact]
  kdump support isn't usable on HiSilicon D05 systems. This previously worked 
in bionic.

  [Test Case]
  sudo apt install linux-crashdump
  echo 'GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT 
crashkernel=512M"' | \
    sudo tee /etc/default/grub.d/kdump-tools.cfg
  sudo update-grub
  sudo reboot
  echo 1 | sudo tee /proc/sys/kernel/sysrq
  echo c | sudo tee /proc/sysrq-trigger

  On failure:
  [    2.362261] ------------[ cut here ]------------
  [    2.362263] [CRTC:29:crtc-0] vblank wait timed out
  [    2.362294] WARNING: CPU: 0 PID: 143 at 
drivers/gpu/drm/drm_atomic_helper.c:1386 
drm_atomic_helper_wait_for_vblanks.part.9+0x280/0x290 [drm_kms_helper]
  [    2.362295] Modules linked in: hibmc_drm(+) ttm drm_kms_helper syscopyarea 
sysfillrect sysimgblt fb_sys_fops drm hisi_sas_v2_hw(+) hisi_sas_main 
ehci_platform libsas scsi_transport_sas
  [    2.362309] CPU: 0 PID: 143 Comm: systemd-udevd Tainted: G         C       
 4.19.0-7-generic #8-Ubuntu
  [    2.362310] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.50 
06/01/2018
  [    2.362312] pstate: 60400005 (nZCv daif +PAN -UAO)
  [    2.362324] pc : drm_atomic_helper_wait_for_vblanks.part.9+0x280/0x290 
[drm_kms_helper]
  [    2.362335] lr : drm_atomic_helper_wait_for_vblanks.part.9+0x280/0x290 
[drm_kms_helper]
  [    2.362336] sp : ffff00000a2fb1f0
  [    2.362337] x29: ffff00000a2fb1f0 x28: 0000000000000001 
  [    2.362339] x27: 0000000000000000 x26: 0000000000000001 
  [    2.362342] x25: 0000000000000038 x24: ffff8000208c5800 
  [    2.362344] x23: 0000000000000000 x22: 0000000000000001 
  [    2.362346] x21: ffff80001eebb818 x20: ffff800025b18600 
  [    2.362349] x19: 0000000000000000 x18: 0000000000000001 
  [    2.362351] x17: 0000000000000000 x16: 0000000000000000 
  [    2.362353] x15: ffffffffffffffff x14: ffff000009848708 
  [    2.362355] x13: 0000000000000074 x12: ffff000009a12000 
  [    2.362357] x11: ffff00000986d000 x10: ffff000009a122f8 
  [    2.362359] x9 : 0000000000000001 x8 : ffff000009a15104 
  [    2.362361] x7 : 0000000000000000 x6 : 0000004ce5700bb7 
  [    2.362363] x5 : 00ffffffffffffff x4 : 0000000000000000 
  [    2.362365] x3 : 0000000000000000 x2 : ffffffffffffffff 
  [    2.362367] x1 : 0b15ae454042e100 x0 : 0000000000000000 
  [    2.362370] Call trace:
  [    2.362381]  drm_atomic_helper_wait_for_vblanks.part.9+0x280/0x290 
[drm_kms_helper]
  [    2.362392]  drm_atomic_helper_commit_tail+0x68/0x80 [drm_kms_helper]
  [    2.362402]  commit_tail+0x7c/0x80 [drm_kms_helper]
  [    2.362413]  drm_atomic_helper_commit+0xd8/0x150 [drm_kms_helper]
  [    2.362440]  drm_atomic_commit+0x54/0x60 [drm]
  [    2.362451]  restore_fbdev_mode_atomic+0x184/0x1f8 [drm_kms_helper]
  [    2.362461]  restore_fbdev_mode+0x48/0x190 [drm_kms_helper]
  [    2.362472]  drm_fb_helper_restore_fbdev_mode_unlocked+0x78/0xd8 
[drm_kms_helper]
  [    2.362482]  drm_fb_helper_set_par+0x34/0x60 [drm_kms_helper]
  [    2.362488]  fbcon_init+0x3ac/0x4f0
  [    2.362491]  visual_init+0xb8/0x110
  [    2.362492]  do_bind_con_driver+0x1ec/0x3a8
  [    2.362494]  do_take_over_console+0x148/0x208
  [    2.362495]  do_fbcon_takeover+0x70/0xd8
  [    2.362497]  fbcon_event_notify+0x838/0x8a8
  [    2.362501]  notifier_call_chain+0x5c/0x98
  [    2.362502]  blocking_notifier_call_chain+0x64/0x88
  [    2.362504]  fb_notifier_call_chain+0x30/0x40
  [    2.362506]  register_framebuffer+0x22c/0x328
  [    2.362516]  __drm_fb_helper_initial_config_and_unlock+0x210/0x408 
[drm_kms_helper]
  [    2.362526]  drm_fb_helper_initial_config+0x4c/0x58 [drm_kms_helper]
  [    2.362530]  hibmc_fbdev_init+0x88/0x190 [hibmc_drm]
  [    2.362534]  hibmc_pci_probe+0x228/0x3c8 [hibmc_drm]
  [    2.362537]  local_pci_probe+0x44/0xa8
  [    2.362539]  pci_device_probe+0x194/0x1a8
  [    2.362541]  really_probe+0x21c/0x3b8
  [    2.362543]  driver_probe_device+0xe4/0x138
  [    2.362544]  __driver_attach+0xe4/0x150
  [    2.362545]  bus_for_each_dev+0x84/0xd8
  [    2.362547]  driver_attach+0x30/0x40
  [    2.362548]  bus_add_driver+0x1a8/0x288
  [    2.362550]  driver_register+0x64/0x110
  [    2.362551]  __pci_register_driver+0x58/0x68
  [    2.362555]  hibmc_init+0x30/0x1000 [hibmc_drm]
  [    2.362557]  do_one_initcall+0x54/0x1d8
  [    2.362560]  do_init_module+0x60/0x1f0
  [    2.362561]  load_module+0x15d0/0x18b8
  [    2.362563]  __se_sys_finit_module+0xa0/0xf8
  [    2.362565]  __arm64_sys_finit_module+0x24/0x30
  [    2.362567]  el0_svc_common+0x94/0xe8
  [    2.362568]  el0_svc_handler+0x38/0x78
  [    2.362570]  el0_svc+0x8/0xc
  [    2.362571] ---[ end trace 8031150f999972d9 ]---

  [Fix]
  2 upstream patch series are required to fix this:
   https://www.mail-archive.com/linux-efi@vger.kernel.org/msg10328.html
  Which provides an EFI facility consumed by:
   https://lkml.org/lkml/2018/9/21/1066
  There were also some follow-on fixes to deal with ARM-specific problems 
associated with this usage:
   https://www.spinics.net/lists/arm-kernel/msg685751.html

  [Regression Risk]
  The EFI changes are in architecture independent code where they add a new 
table and an API for adding regions to that table. However, this API is only 
used by the gic-v3-its driver, which is ARM-specific. On other architectures, 
this will be an empty table. It's possible that there is a bug in the table 
creation code that could cause regressions on other architectures, which would 
likely be seen in the form of a boot time error message ("Failed to install 
memreserve config table").

  Risk mitigated by testing on both x86 ARM and EFI systems.

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