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| author | Sven Peter <sven@svenpeter.dev> | 2021-09-24 15:45:02 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-09-28 11:47:24 +0200 |
| commit | f0b636804c7c4c564efbca5981e3c56b5c6fe0c5 (patch) | |
| tree | 97123a6b7f6e9592f417d0146fc61d5c795fa702 /tools/testing/selftests/bpf/prog_tests/autoload.c | |
| parent | 0b482d0c75bf321b2fd87d215c3d6df095a601d1 (diff) | |
iommu/dart: Clear sid2group entry when a group is freed
sid2groups keeps track of which stream id combinations belong to a
iommu_group to assign those correctly to devices.
When a iommu_group is freed a stale pointer will however remain in
sid2groups. This prevents devices with the same stream id combination
to ever be attached again (see below).
Fix that by creating a shadow copy of the stream id configuration
when a group is allocated for the first time and clear the sid2group
entry when that group is freed.
# echo 1 >/sys/bus/pci/devices/0000\:03\:00.0/remove
pci 0000:03:00.0: Removing from iommu group 1
# echo 1 >/sys/bus/pci/rescan
[...]
pci 0000:03:00.0: BAR 0: assigned [mem 0x6a0000000-0x6a000ffff 64bit pref]
pci 0000:03:00.0: BAR 2: assigned [mem 0x6a0010000-0x6a001ffff 64bit pref]
pci 0000:03:00.0: BAR 6: assigned [mem 0x6c0100000-0x6c01007ff pref]
tg3 0000:03:00.0: Failed to add to iommu group 1: -2
[...]
Fixes: 46d1fb072e76b161 ("iommu/dart: Add DART iommu driver")
Reported-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Tested-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210924134502.15589-1-sven@svenpeter.dev
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/autoload.c')
0 files changed, 0 insertions, 0 deletions