Fix kernel panic caused by legacy devices on AMD platforms

[Kai-Heng Feng]

[Impact]
When a legacy device is only 32bit DMA capable and it's in the same
IOMMU group with iommu_v2 capable devices, the device in question will
be forced to use identity mapping and triggers kernel panic on DMA
operation because it can't do 64bit DMA.

[Fix]
Keep swiotlb enabled so legacy devices can do 64bit DMA. This is also
how Intel and ARM64 platforms deal with legacy devices.

[Test]
Boot an affected system. Kernel panic in Realtek WiFi driver's probe
routine.

After the patch is applied, the system can work normally.

[Where problems could occur]
The default swiotlb uses 64MB memory, so if the system doesn't have any
legacy device, there are 64MB ram less for the system to use.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.10 - 5.10.0-1044.46

---------------
linux-oem-5.10 (5.10.0-1044.46) focal; urgency=medium

  * focal/linux-oem-5.10: 5.10.0-1044.46 -proposed tracker (LP: #1939533)

  * mute/micmute LEDs no function on HP ProBook 650 G8 (LP: #1939473)
    - SAUCE: ALSA: hda/realtek: fix mute/micmute LEDs for HP ProBook 650 G8
      Notebook PC

 -- Chia-Lin Kao (AceLan) <email address hidden> Wed, 11 Aug 2021 17:35:07 +0800

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.13 - 5.13.0-1010.11

---------------
linux-oem-5.13 (5.13.0-1010.11) focal; urgency=medium

  * focal/linux-oem-5.13: 5.13.0-1010.11 -proposed tracker (LP: #1937217)

  * Packaging resync (LP: #1786013)
    - [Packaging] update update.conf, follow impish

  * [SRU][OEM-5.13/U] Fix firmware reload failure of MT7921 (LP: #1936790)
    - mt76: mt7921: continue to probe driver when fw already downloaded

  * Backport support for AMD SMU statistics (LP: #1934809)
    - platform/x86: amd-pmc: Fix command completion code
    - platform/x86: amd-pmc: Fix SMU firmware reporting mechanism
    - platform/x86: amd-pmc: call dump registers only once
    - platform/x86: amd-pmc: Add support for logging SMU metrics
    - platform/x86: amd-pmc: Add support for logging s0ix counters
    - platform/x86: amd-pmc: Add support for ACPI ID AMDI0006
    - platform/x86: amd-pmc: Add new acpi id for future PMC controllers
    - platform/x86: amd-pmc: Use return code on suspend
    - platform/x86: amd-pmc: Fix missing unlock on error in amd_pmc_send_cmd()
    - platform/x86: amd-pmc: Fix undefined reference to __udivdi3

  * Skip rtcpie test in kselftests/timers if the default RTC device does not
    exist (LP: #1937991)
    - selftests: timers: rtcpie: skip test if default RTC device does not exist

  * Support AMD W6600 [1002:73E3] (LP: #1938145)
    - drm/amdgpu: add new dimgrey cavefish DID

  * Add additional Mediatek MT7921 WiFi/BT device IDs (LP: #1937004)
    - Bluetooth: btusb: Fixed too many in-token issue for Mediatek Chip.
    - Bluetooth: btusb: Add support for Lite-On Mediatek Chip
    - Bluetooth: btusb: fix memory leak
    - SAUCE: Bluetooth: btusb: Add Mediatek MT7921 support for Foxconn
    - SAUCE: Bluetooth: btusb: Add Mediatek MT7921 support for IMC Network
    - SAUCE: Bluetooth: btusb: Add support for Foxconn Mediatek Chip

  * Add new PCI MMIO based thermal driver [8086:461d] for Intel Alder Lake
    (LP: #1934741)
    - thermal/drivers/int340x/processor_thermal: Split enumeration and processing
      part
    - thermal/drivers/int340x/processor_thermal: Add PCI MMIO based thermal driver

  * On TGL platforms screen shows garbage when browsing website by scrolling
    mouse (LP: #1926579)
    - drm/i915/display: Disable PSR2 if TGL Display stepping is B1 from A0

  * Fix kernel panic caused by legacy devices on AMD platforms (LP: #1936682)
    - SAUCE: iommu/amd: Keep swiotlb enabled to ensure devices with 32bit DMA
      still work

  * Fix display output on HP hybrid GFX laptops (LP: #1936296)
    - drm/i915: Invoke another _DSM to enable MUX on HP Workstation laptops

  * Add support for AMD BCL DID (LP: #1936785)
    - SAUCE: drm/amdgpu: add another Renior DID

  * e1000e blocks the boot process when it tried to write checksum to its NVM
    (LP: #1936998)
    - SAUCE: e1000e: Do not take care about recovery NVM checksum

  * Mute/mic LEDs no function on some HP platfroms (LP: #1934878)
    - ALSA: hda/realtek: fix mute/micmute LEDs for HP ProBook 450 G8
    - ALSA: hda/realtek: fix mute/micmute LEDs for HP ProBook 445 G8
    - ALSA: hda/realtek: fix mute/micmute LEDs for HP ProBook 630 G8

  * ...

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-hirsute' to 'verification-done-hirsute'. If the problem still exists, change the tag 'verification-needed-hirsute' to 'verification-failed-hirsute'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.13.0-16.16

---------------
linux (5.13.0-16.16) impish; urgency=medium

  * impish/linux: 5.13.0-16.16 -proposed tracker (LP: #1942611)

  * Miscellaneous Ubuntu changes
    - [Config] update toolchain in configs

  * Miscellaneous upstream changes
    - Revert "UBUNTU: [Config] Enable CONFIG_UBSAN_BOUNDS"

 -- Andrea Righi <email address hidden> Fri, 03 Sep 2021 16:21:14 +0200

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.11.0-37.41

---------------
linux (5.11.0-37.41) hirsute; urgency=medium

  * hirsute/linux: 5.11.0-37.41 -proposed tracker (LP: #1944180)

  * CVE-2021-41073
    - io_uring: ensure symmetry in handling iter types in loop_rw_iter()

  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/2021.09.06)

  * LRMv5: switch primary version handling to kernel-versions data set
    (LP: #1928921)
    - [Packaging] switch to kernel-versions

  * disable “CONFIG_HISI_DMA” config for ubuntu version (LP: #1936771)
    - Disable CONFIG_HISI_DMA
    - [Config] Record hisi_dma no longer built for arm64

  * ubunut_kernel_selftests: memory-hotplug: avoid spamming logs with
    dump_page() (LP: #1941829)
    - selftests: memory-hotplug: avoid spamming logs with dump_page(), ratio limit
      hot-remove error test

  * alsa: the soundwire audio doesn't work on the Dell TGL-H machines
    (LP: #1941669)
    - ASoC: SOF: allow soundwire use desc->default_fw_filename
    - ASoC: Intel: tgl: remove sof_fw_filename set for tgl_3_in_1_default

  * e1000e blocks the boot process when it tried to write checksum to its NVM
    (LP: #1936998)
    - e1000e: Do not take care about recovery NVM checksum

  * Dell XPS 17 (9710) PCI/internal sound card not detected (LP: #1935850)
    - ASoC: Intel: sof_sdw: include rt711.h for RT711 JD mode
    - ASoC: Intel: sof_sdw: add quirk for Dell XPS 9710

  * mute/micmute LEDs no function on HP ProBook 650 G8 (LP: #1939473)
    - ALSA: hda/realtek: fix mute/micmute LEDs for HP ProBook 650 G8 Notebook PC

  * Fix mic noise on HP ProBook 445 G8 (LP: #1940610)
    - ALSA: hda/realtek: Limit mic boost on HP ProBook 445 G8

  * GPIO error logs in start and dmesg after update of kernel (LP: #1937897)
    - ODM: mfd: Check AAEON BFPI version before adding device

  * External displays not working on Thinkpad T490 with ThinkPad Thunderbolt 3
    Dock (LP: #1938999)
    - drm/i915/ilk-glk: Fix link training on links with LTTPRs

  * Fix kernel panic caused by legacy devices on AMD platforms (LP: #1936682)
    - SAUCE: iommu/amd: Keep swiotlb enabled to ensure devices with 32bit DMA
      still work

  * Hirsute update: upstream stable patchset 2021-08-30 (LP: #1942123)
    - drm/i915: Revert "drm/i915/gem: Asynchronous cmdparser"
    - Revert "drm/i915: Propagate errors on awaiting already signaled fences"
    - regulator: rtmv20: Fix wrong mask for strobe-polarity-high
    - regulator: rt5033: Fix n_voltages settings for BUCK and LDO
    - spi: stm32h7: fix full duplex irq handler handling
    - ASoC: tlv320aic31xx: fix reversed bclk/wclk master bits
    - r8152: Fix potential PM refcount imbalance
    - qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()
    - ASoC: rt5682: Fix the issue of garbled recording after powerd_dbus_suspend
    - net: Fix zero-copy head len calculation.
    - ASoC: ti: j721e-evm: Fix unbalanced domain activity tracking during startup
    - ASoC: ti: j721e-evm: Check for not initialized parent_clk_id
    - efi/mokvar: Reserve the table only if it is in boot services data
    - nvme: fix nvme_setup_command ...