https://github.com/torvalds/linux
Revision 6778ff5b21bd8e78c8bd547fd66437cf2657fd9b authored by Suravee Suthikulpanit on 08 February 2021, 12:27:12 UTC, committed by Joerg Roedel on 12 February 2021, 10:46:45 UTC
Certain AMD platforms enable power gating feature for IOMMU PMC,
which prevents the IOMMU driver from updating the counter while
trying to validate the PMC functionality in the init_iommu_perf_ctr().
This results in disabling PMC support and the following error message:
"AMD-Vi: Unable to read/write to IOMMU perf counter"
To workaround this issue, disable power gating temporarily by programming
the counter source to non-zero value while validating the counter,
and restore the prior state afterward.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Tested-by: Tj (Elloe Linux) <ml.linux@elloe.vision>
Link: https://lore.kernel.org/r/20210208122712.5048-1-suravee.suthikulpanit@amd.com
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201753
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Tip revision: 6778ff5b21bd8e78c8bd547fd66437cf2657fd9b authored by Suravee Suthikulpanit on 08 February 2021, 12:27:12 UTC
iommu/amd: Fix performance counter initialization
iommu/amd: Fix performance counter initialization
Tip revision: 6778ff5
| File | Mode | Size |
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| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | -rw-r--r-- | 16.3 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.8 KB |
| .mailmap | -rw-r--r-- | 18.1 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 98.4 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 572.3 KB |
| Makefile | -rw-r--r-- | 62.9 KB |
| README | -rw-r--r-- | 727 bytes |
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