From 77308e27a0592857438cfd501cce813c513043a2 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 17 Sep 2018 19:10:24 +0200 Subject: ia64: remove the dead iommu_sac_force variable Looks like copy and paste from x86 that never actually got used. Signed-off-by: Christoph Hellwig Signed-off-by: Tony Luck --- arch/ia64/kernel/pci-dma.c | 19 ------------------- 1 file changed, 19 deletions(-) (limited to 'arch/ia64') diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c index b5df084c0af4..50b6ad282a90 100644 --- a/arch/ia64/kernel/pci-dma.c +++ b/arch/ia64/kernel/pci-dma.c @@ -18,8 +18,6 @@ dma_addr_t bad_dma_address __read_mostly; EXPORT_SYMBOL(bad_dma_address); -static int iommu_sac_force __read_mostly; - int no_iommu __read_mostly; #ifdef CONFIG_IOMMU_DEBUG int force_iommu __read_mostly = 1; @@ -61,23 +59,6 @@ int iommu_dma_supported(struct device *dev, u64 mask) if (mask < DMA_BIT_MASK(24)) return 0; - /* Tell the device to use SAC when IOMMU force is on. This - allows the driver to use cheaper accesses in some cases. - - Problem with this is that if we overflow the IOMMU area and - return DAC as fallback address the device may not handle it - correctly. - - As a special case some controllers have a 39bit address - mode that is as efficient as 32bit (aic79xx). Don't force - SAC for these. Assume all masks <= 40 bits are of this - type. Normally this doesn't make any difference, but gives - more gentle handling of IOMMU overflow. */ - if (iommu_sac_force && (mask >= DMA_BIT_MASK(40))) { - dev_info(dev, "Force SAC with mask %llx\n", mask); - return 0; - } - return 1; } EXPORT_SYMBOL(iommu_dma_supported); -- cgit