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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-11 12:22:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-11 12:22:12 -0700 |
| commit | e16c4790de39dc861b749674c2a9319507f6f64f (patch) | |
| tree | ff59a163d1640813e6f2fc461888aa4167c2c282 /drivers/iommu/Kconfig | |
| parent | f7cca14bcec49989bcfe7cf2135ac719352d7022 (diff) | |
| download | blackbird-op-linux-e16c4790de39dc861b749674c2a9319507f6f64f.tar.gz blackbird-op-linux-e16c4790de39dc861b749674c2a9319507f6f64f.zip | |
Revert "iommu/amd_iommu: Use CONFIG_DMA_DIRECT_OPS=y and dma_direct_{alloc,free}()"
This reverts commit b468620f2a1dfdcfddfd6fa54367b8bcc1b51248.
It turns out that this broke drm on AMD platforms. Quoting Gabriel C:
"I can confirm reverting b468620f2a1dfdcfddfd6fa54367b8bcc1b51248 fixes
that issue for me.
The GPU is working fine with SME enabled.
Now with working GPU :) I can also confirm performance is back to
normal without doing any other workarounds"
Christan König analyzed it partially:
"As far as I analyzed it we now get an -ENOMEM from dma_alloc_attrs()
in drivers/gpu/drm/ttm/ttm_page_alloc_dma.c when IOMMU is enabled"
and Christoph Hellwig responded:
"I think the prime issue is that dma_direct_alloc respects the dma
mask. Which we don't need if actually using the iommu. This would be
mostly harmless exept for the the SEV bit high in the address that
makes the checks fail.
For now I'd say revert this commit for 4.17/4.18-rc and I'll look into
addressing these issues properly"
Reported-and-bisected-by: Gabriel C <nix.or.die@gmail.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Christian König <christian.koenig@amd.com>
Cc: Michel Dänzer <michel.daenzer@amd.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org # v4.17
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/iommu/Kconfig')
| -rw-r--r-- | drivers/iommu/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 8ea77efb2e29..e055d228bfb9 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -107,7 +107,6 @@ config IOMMU_PGTABLES_L2 # AMD IOMMU support config AMD_IOMMU bool "AMD IOMMU support" - select DMA_DIRECT_OPS select SWIOTLB select PCI_MSI select PCI_ATS |
