diff options
Diffstat (limited to 'kernel/arch/ia64/kernel/pci-dma.c')
-rw-r--r-- | kernel/arch/ia64/kernel/pci-dma.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/kernel/arch/ia64/kernel/pci-dma.c b/kernel/arch/ia64/kernel/pci-dma.c new file mode 100644 index 000000000..992c1098c --- /dev/null +++ b/kernel/arch/ia64/kernel/pci-dma.c @@ -0,0 +1,110 @@ +/* + * Dynamic DMA mapping support. + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/pci.h> +#include <linux/module.h> +#include <linux/dmar.h> +#include <asm/iommu.h> +#include <asm/machvec.h> +#include <linux/dma-mapping.h> + + +#ifdef CONFIG_INTEL_IOMMU + +#include <linux/kernel.h> + +#include <asm/page.h> + +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; +#else +int force_iommu __read_mostly; +#endif + +int iommu_pass_through; + +extern struct dma_map_ops intel_dma_ops; + +static int __init pci_iommu_init(void) +{ + if (iommu_detected) + intel_iommu_init(); + + return 0; +} + +/* Must execute after PCI subsystem */ +fs_initcall(pci_iommu_init); + +void pci_iommu_shutdown(void) +{ + return; +} + +void __init +iommu_dma_init(void) +{ + return; +} + +int iommu_dma_supported(struct device *dev, u64 mask) +{ + /* Copied from i386. Doesn't make much sense, because it will + only work for pci_alloc_coherent. + The caller just has to use GFP_DMA in this case. */ + 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); + +void __init pci_iommu_alloc(void) +{ + dma_ops = &intel_dma_ops; + + dma_ops->sync_single_for_cpu = machvec_dma_sync_single; + dma_ops->sync_sg_for_cpu = machvec_dma_sync_sg; + dma_ops->sync_single_for_device = machvec_dma_sync_single; + dma_ops->sync_sg_for_device = machvec_dma_sync_sg; + dma_ops->dma_supported = iommu_dma_supported; + + /* + * The order of these functions is important for + * fall-back/fail-over reasons + */ + detect_intel_iommu(); + +#ifdef CONFIG_SWIOTLB + pci_swiotlb_init(); +#endif +} + +#endif |