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x86/pci-dma: remove the experimental forcesac boot option

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Limiting the dma mask to avoid PCI (pre-PCIe) DAC cycles while paying
the huge overhead of an IOMMU is rather pointless, and this seriously
gets in the way of dma mapping work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Christoph Hellwig
2018-04-27 09:13:24 +02:00
parent 84564d1c76
commit 06e9552f5f
5 changed files with 6 additions and 30 deletions
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Documentation/admin-guide/kernel-parameters.txt
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@@ -1705,7 +1705,6 @@
nopanic
merge
nomerge
forcesac
soft
pt [x86, IA-64]
nobypass [PPC/POWERNV]