Public bug reported:
In Ubuntu, CONFIG_PCI_REALLOC_ENABLE_AUTO config option is enabled by
default. As a result, OS tries to remap BAR addresses and a failure is
observed in remapping BARs.
The issue is observed only when the SRIOV flag is disabled in BIOS.
The issue can be worked by disabling BAR remapping bypassing
“pci=realloc=off” kernel parameter. It has been tested with positive
results.
Dmesg also shows the following messages indicating that the setting up
of standard BAR registers for the GPGPUs has failed.
Jun 21 06:14:47 R750XAS kernel: [ 70.384361] pci 0000:17:00.0: BAR 1: no
space for [mem size 0x2000000000 64bit pref]
Jun 21 06:14:47 R750XAS kernel: [ 70.476810] pci 0000:17:00.0: BAR 1: failed
to assign [mem size 0x2000000000 64bit pref]
Jun 21 06:14:47 R750XAS kernel: [ 71.041877] pci 0000:17:00.0: BAR 0: no
space for [mem size 0x01000000]
Jun 21 06:14:47 R750XAS kernel: [ 71.120838] pci 0000:17:00.0: BAR 0: failed
to assign [mem size 0x01000000]
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1948446
Title:
failure is observed in remapping BARs 20.04
Status in linux package in Ubuntu:
New
Bug description:
In Ubuntu, CONFIG_PCI_REALLOC_ENABLE_AUTO config option is enabled by
default. As a result, OS tries to remap BAR addresses and a failure is
observed in remapping BARs.
The issue is observed only when the SRIOV flag is disabled in BIOS.
The issue can be worked by disabling BAR remapping bypassing
“pci=realloc=off” kernel parameter. It has been tested with positive
results.
Dmesg also shows the following messages indicating that the setting up
of standard BAR registers for the GPGPUs has failed.
Jun 21 06:14:47 R750XAS kernel: [ 70.384361] pci 0000:17:00.0: BAR 1: no
space for [mem size 0x2000000000 64bit pref]
Jun 21 06:14:47 R750XAS kernel: [ 70.476810] pci 0000:17:00.0: BAR 1:
failed to assign [mem size 0x2000000000 64bit pref]
Jun 21 06:14:47 R750XAS kernel: [ 71.041877] pci 0000:17:00.0: BAR 0: no
space for [mem size 0x01000000]
Jun 21 06:14:47 R750XAS kernel: [ 71.120838] pci 0000:17:00.0: BAR 0:
failed to assign [mem size 0x01000000]
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