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| author | Vasant Hegde <vasant.hegde@amd.com> | 2025-01-27 09:44:11 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:22 +0100 |
| commit | 40c731472f41c6a802a5412680172afff9ea3891 (patch) | |
| tree | ab8248ffe05fb9dcb01d1bd8dbae08a1c3e1d550 /scripts/objdiff | |
| parent | a7052afa9eae2239e25943baa8817a6a56e8aa68 (diff) | |
| download | linux-40c731472f41c6a802a5412680172afff9ea3891.tar.gz linux-40c731472f41c6a802a5412680172afff9ea3891.tar.bz2 linux-40c731472f41c6a802a5412680172afff9ea3891.zip | |
iommu/amd: Expicitly enable CNTRL.EPHEn bit in resume path
[ Upstream commit ef75966abf950c0539534effa4960caa29fb7167 ]
With recent kernel, AMDGPU failed to resume after suspend on certain laptop.
Sample log:
-----------
Nov 14 11:52:19 Thinkbook kernel: iommu ivhd0: AMD-Vi: Event logged [ILLEGAL_DEV_TABLE_ENTRY device=0000:06:00.0 pasid=0x00000 address=0x135300000 flags=0x0080]
Nov 14 11:52:19 Thinkbook kernel: AMD-Vi: DTE[0]: 7d90000000000003
Nov 14 11:52:19 Thinkbook kernel: AMD-Vi: DTE[1]: 0000100103fc0009
Nov 14 11:52:19 Thinkbook kernel: AMD-Vi: DTE[2]: 2000000117840013
Nov 14 11:52:19 Thinkbook kernel: AMD-Vi: DTE[3]: 0000000000000000
This is because in resume path, CNTRL[EPHEn] is not set. Fix this by
setting CNTRL[EPHEn] to 1 in resume path if EFR[EPHSUP] is set.
Note
May be better approach is to save the control register in suspend path
and restore it in resume path instead of trying to set indivisual
bits. We will have separate patch for that.
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219499
Fixes: c4cb23111103 ("iommu/amd: Add support for enable/disable IOPF")
Tested-by: Hamish McIntyre-Bhatty <kernel-bugzilla@regd.hamishmb.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20250127094411.5931-1-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts/objdiff')
0 files changed, 0 insertions, 0 deletions