Bug#867548: New HDMI audio video IOMMU issues in Bullseye upgrade on Haswell are old

[Bryan Cebuliak]

bullseye with intel_iommu=on,igfx_off:
sudo dmesg | grep -e DMAR -e IOMMU
[    0.007516] ACPI: DMAR 0x00000000D8FFEAE8 0000B8 (v01 INTEL  HSW
 00000001 INTL 00000001)
[    0.007531] ACPI: Reserving DMAR table memory at [mem
0xd8ffeae8-0xd8ffeb9f]
[    0.019109] DMAR: Disable GFX device mapping
[    0.047926] DMAR: Host address width 39
[    0.047926] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.047930] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap
c0000020660462 ecap f0101a
[    0.047930] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.047932] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap
d2008020660462 ecap f010da
[    0.047933] DMAR: RMRR base: 0x000000dbcf6000 end: 0x000000dbd03fff
[    0.047934] DMAR: RMRR base: 0x000000dd000000 end: 0x000000df1fffff
[    0.047936] DMAR-IR: IOAPIC id 8 under DRHD base  0xfed91000 IOMMU 1
[    0.047937] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[    0.047937] DMAR-IR: Queued invalidation will be enabled to support
x2apic and Intr-remapping.
[    0.048327] DMAR-IR: Enabled IRQ remapping in x2apic mode
[    0.793666] DMAR: No ATSR found
[    0.793696] DMAR: dmar1: Using Queued invalidation
[    0.795240] DMAR: Intel(R) Virtualization Technology for Directed I/O
[    0.799207] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel at suse.de>
[    0.799207] AMD-Vi: AMD IOMMUv2 functionality not available on this
system


bullseye with no intel_iommu command line setting:
dmesg | grep -e DMAR -e IOMMU
[    0.007532] ACPI: DMAR 0x00000000D8FFEAE8 0000B8 (v01 INTEL  HSW
 00000001 INTL 00000001)
[    0.007546] ACPI: Reserving DMAR table memory at [mem
0xd8ffeae8-0xd8ffeb9f]
[    0.048030] DMAR: Host address width 39
[    0.048031] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.048034] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap
c0000020660462 ecap f0101a
[    0.048035] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.048037] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap
d2008020660462 ecap f010da
[    0.048037] DMAR: RMRR base: 0x000000dbcf6000 end: 0x000000dbd03fff
[    0.048038] DMAR: RMRR base: 0x000000dd000000 end: 0x000000df1fffff
[    0.048040] DMAR-IR: IOAPIC id 8 under DRHD base  0xfed91000 IOMMU 1
[    0.048040] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[    0.048041] DMAR-IR: Queued invalidation will be enabled to support
x2apic and Intr-remapping.
[    0.048426] DMAR-IR: Enabled IRQ remapping in x2apic mode
[    0.794120] DMAR: No ATSR found
[    0.794149] DMAR: dmar0: Using Queued invalidation
[    0.794154] DMAR: dmar1: Using Queued invalidation
[    0.863652] DMAR: Intel(R) Virtualization Technology for Directed I/O
[    0.867732] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel at suse.de>

[    0.867733] AMD-Vi: AMD IOMMUv2 functionality not available on this
system
[    1.250394] i915 0000:00:02.0: [drm] DMAR active, disabling use of
stolen memory

buster no intel_iommu setting:
dmesg | grep -e DMAR -e IOMMU
[    0.009193] ACPI: DMAR 0x00000000D8FFEAE8 0000B8 (v01 INTEL  HSW
 00000001 INTL 00000001)
[    0.192242] DMAR: Host address width 39
[    0.192243] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.192246] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap
c0000020660462 ecap f0101a
[    0.192246] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.192248] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap
d2008020660462 ecap f010da
[    0.192249] DMAR: RMRR base: 0x000000dbcf6000 end: 0x000000dbd03fff
[    0.192249] DMAR: RMRR base: 0x000000dd000000 end: 0x000000df1fffff
[    0.192251] DMAR-IR: IOAPIC id 8 under DRHD base  0xfed91000 IOMMU 1
[    0.192251] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[    0.192252] DMAR-IR: Queued invalidation will be enabled to support
x2apic and Intr-remapping.
[    0.192637] DMAR-IR: Enabled IRQ remapping in x2apic mode
[    0.846867] AMD IOMMUv2 driver by Joerg Roedel <jroedel at suse.de>
[    0.846867] AMD IOMMUv2 functionality not available on this system

On Sat, 3 Jul 2021 at 02:22, Bryan Cebuliak <bryan.cebuliak at gmail.com>
wrote:

> If  igfx_off is  default, how / why is  it  on?
> from
> https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
> "...
>
> intel_iommu=    [DMAR] Intel IOMMU driver (DMAR) option
>                 on
>                         Enable intel iommu driver.
>                 off
>                         Disable intel iommu driver.
>                 igfx_off [Default Off]
>                         By default, gfx is mapped as normal device. If a gfx
>                         device has a dedicated DMAR unit, the DMAR unit is
>                         bypassed by not enabling DMAR with this option. In
>                         this case, gfx device will use physical address for
>                         DMA.
> ...
>
>
> On Sat, 3 Jul 2021 at 01:25, Bryan Cebuliak <bryan.cebuliak at gmail.com>
> wrote:
>
>> more  possibly relevant IOMMU video audio  and  passthrough issue links:
>> Easy ACS kernel patch guide for Ubuntu 20.04
>> https://www.youtube.com/watch?v=JBEzshbGPhQ
>>
>>
>> https://forum.level1techs.com/t/intel-graphics-hdmi-audio-fails-after-enabling-intel-iommu-on/168827
>>
>> kvm-gpu-passthrough-on-debian-buster.md
>> https://gist.github.com/davesilva/445276f9157e7cb3a4f6ed2fe852b340
>>
>>
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