diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-09-17 19:10:24 +0200 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2018-09-17 19:15:12 +0200 |
| commit | 77308e27a0592857438cfd501cce813c513043a2 (patch) | |
| tree | 2261aba8c318b6c35b551d536d0bfb6719d85565 /arch/ia64 | |
| parent | ia64: remove the kern_mem_attribute export (diff) | |
| download | linux-77308e27a0592857438cfd501cce813c513043a2.tar.xz linux-77308e27a0592857438cfd501cce813c513043a2.zip | |
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 <hch@lst.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/kernel/pci-dma.c | 19 |
1 files changed, 0 insertions, 19 deletions
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); |