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| author | Christoph Hellwig <hch@lst.de> | 2018-04-27 09:31:47 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-05-28 12:48:21 +0200 |
| commit | 098afd981744061d37eb4d40bc3f755438570afb (patch) | |
| tree | e9086d4732a6c381a03406f4331a8477e2a780a7 | |
| parent | 06e9552f5f12564dc1c3483f0934d96cc4f72f18 (diff) | |
| download | linux-098afd981744061d37eb4d40bc3f755438570afb.tar.gz linux-098afd981744061d37eb4d40bc3f755438570afb.tar.bz2 linux-098afd981744061d37eb4d40bc3f755438570afb.zip | |
x86/pci-dma: remove the explicit nodac and allowdac option
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>
| -rw-r--r-- | Documentation/x86/x86_64/boot-options.txt | 5 | ||||
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 4 |
2 files changed, 2 insertions, 7 deletions
diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt index 341588ec4e29..8d109ef67ab6 100644 --- a/Documentation/x86/x86_64/boot-options.txt +++ b/Documentation/x86/x86_64/boot-options.txt @@ -236,11 +236,6 @@ IOMMU (input/output memory management unit) nomerge Don't do scatter-gather (SG) merging. noaperture Ask the IOMMU not to touch the aperture for AGP. noagp Don't initialize the AGP driver and use full aperture. - allowdac Allow double-address cycle (DAC) mode, i.e. DMA >4GB. - DAC is used with 32-bit PCI to push a 64-bit address in - two cycles. When off all DMA over >4GB is forced through - an IOMMU or software bounce buffering. - nodac Forbid DAC mode, i.e. DMA >4GB. panic Always panic when IOMMU overflows. calgary Use the Calgary IOMMU if it is available diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index b65b0d7072f1..b523414bc323 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -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; |