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x86/pci-dma: remove the explicit nodac and allowdac option

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This is something drivers should decide (modulo chipset quirks like
for VIA), which as far as I can tell is how things have been handled
for the last 15 years.

Note that we keep the usedac option for now, as it is used in the wild
to override the too generic VIA quirk.

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 09:31:47 +02:00
parent 06e9552f5f
commit 098afd9817
2 changed files with 2 additions and 7 deletions
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4
arch/x86/kernel/pci-dma.c
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@@ -122,9 +122,9 @@ static __init int iommu_setup(char *p)
if (!strncmp(p, "forcesac", 8))
pr_warn("forcesac option ignored.\n");
if (!strncmp(p, "allowdac", 8))
forbid_dac = 0;
pr_warn("allowdac option ignored.\n");
if (!strncmp(p, "nodac", 5))
forbid_dac = 1;
pr_warn("nodac option ignored.\n");
if (!strncmp(p, "usedac", 6)) {
forbid_dac = -1;
return 1;