diff options
| author | Will Deacon <[email protected]> | 2019-08-21 14:17:00 +0100 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2019-08-21 17:58:12 +0100 |
| commit | b5e86196b83fd68e065a7c811ab8925fb0dc3893 (patch) | |
| tree | ca99cf5850bc09b643f6afbc68d45b10ea5ec127 /lib/test-string_helpers.c | |
| parent | 05cbaf4ddd02b69d78d43481e3813b4579572f71 (diff) | |
iommu/arm-smmu-v3: Disable detection of ATS and PRI
Detecting the ATS capability of the SMMU at probe time introduces a
spinlock into the ->unmap() fast path, even when ATS is not actually
in use. Furthermore, the ATC invalidation that exists is broken, as it
occurs before invalidation of the main SMMU TLB which leaves a window
where the ATC can be repopulated with stale entries.
Given that ATS is both a new feature and a specialist sport, disable it
for now whilst we fix it properly in subsequent patches. Since PRI
requires ATS, disable that too.
Cc: <[email protected]>
Fixes: 9ce27afc0830 ("iommu/arm-smmu-v3: Add support for PCI ATS")
Acked-by: Robin Murphy <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'lib/test-string_helpers.c')
0 files changed, 0 insertions, 0 deletions