From c4fbd8a94697ff1186130542f36d7b520b288001 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 11 Oct 2007 11:14:38 +0200 Subject: x86_64: prepare shared kernel/pci-nommu.c Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile index 9799e58..e74f4dd 100644 --- a/arch/x86_64/kernel/Makefile +++ b/arch/x86_64/kernel/Makefile @@ -8,7 +8,7 @@ obj-y := process.o signal.o entry.o traps_64.o irq.o \ ptrace.o time.o ioport_64.o ldt.o setup_64.o i8259_64.o sys_x86_64.o \ x8664_ksyms.o i387.o syscall.o vsyscall_64.o \ setup64.o bootflag.o e820_64.o reboot.o quirks.o i8237.o \ - pci-dma_64.o pci-nommu.o alternative.o hpet_64.o tsc.o bugs.o \ + pci-dma_64.o pci-nommu_64.o alternative.o hpet_64.o tsc.o bugs.o \ perfctr-watchdog.o obj-$(CONFIG_STACKTRACE) += stacktrace.o diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c deleted file mode 100644 index 2a34c6c..0000000 --- a/arch/x86_64/kernel/pci-nommu.c +++ /dev/null @@ -1,97 +0,0 @@ -/* Fallback functions when the main IOMMU code is not compiled in. This - code is roughly equivalent to i386. */ -#include -#include -#include -#include -#include - -#include -#include -#include - -static int -check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size) -{ - if (hwdev && bus + size > *hwdev->dma_mask) { - if (*hwdev->dma_mask >= DMA_32BIT_MASK) - printk(KERN_ERR - "nommu_%s: overflow %Lx+%zu of device mask %Lx\n", - name, (long long)bus, size, - (long long)*hwdev->dma_mask); - return 0; - } - return 1; -} - -static dma_addr_t -nommu_map_single(struct device *hwdev, void *ptr, size_t size, - int direction) -{ - dma_addr_t bus = virt_to_bus(ptr); - if (!check_addr("map_single", hwdev, bus, size)) - return bad_dma_address; - return bus; -} - -static void nommu_unmap_single(struct device *dev, dma_addr_t addr,size_t size, - int direction) -{ -} - -/* Map a set of buffers described by scatterlist in streaming - * mode for DMA. This is the scatter-gather version of the - * above pci_map_single interface. Here the scatter gather list - * elements are each tagged with the appropriate dma address - * and length. They are obtained via sg_dma_{address,length}(SG). - * - * NOTE: An implementation may be able to use a smaller number of - * DMA address/length pairs than there are SG table elements. - * (for example via virtual mapping capabilities) - * The routine returns the number of addr/length pairs actually - * used, at most nents. - * - * Device ownership issues as mentioned above for pci_map_single are - * the same here. - */ -static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg, - int nents, int direction) -{ - int i; - - for (i = 0; i < nents; i++ ) { - struct scatterlist *s = &sg[i]; - BUG_ON(!s->page); - s->dma_address = virt_to_bus(page_address(s->page) +s->offset); - if (!check_addr("map_sg", hwdev, s->dma_address, s->length)) - return 0; - s->dma_length = s->length; - } - return nents; -} - -/* Unmap a set of streaming mode DMA translations. - * Again, cpu read rules concerning calls here are the same as for - * pci_unmap_single() above. - */ -static void nommu_unmap_sg(struct device *dev, struct scatterlist *sg, - int nents, int dir) -{ -} - -const struct dma_mapping_ops nommu_dma_ops = { - .map_single = nommu_map_single, - .unmap_single = nommu_unmap_single, - .map_sg = nommu_map_sg, - .unmap_sg = nommu_unmap_sg, - .is_phys = 1, -}; - -void __init no_iommu_init(void) -{ - if (dma_ops) - return; - - force_iommu = 0; /* no HW IOMMU */ - dma_ops = &nommu_dma_ops; -} diff --git a/arch/x86_64/kernel/pci-nommu_64.c b/arch/x86_64/kernel/pci-nommu_64.c new file mode 100644 index 0000000..2a34c6c --- /dev/null +++ b/arch/x86_64/kernel/pci-nommu_64.c @@ -0,0 +1,97 @@ +/* Fallback functions when the main IOMMU code is not compiled in. This + code is roughly equivalent to i386. */ +#include +#include +#include +#include +#include + +#include +#include +#include + +static int +check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size) +{ + if (hwdev && bus + size > *hwdev->dma_mask) { + if (*hwdev->dma_mask >= DMA_32BIT_MASK) + printk(KERN_ERR + "nommu_%s: overflow %Lx+%zu of device mask %Lx\n", + name, (long long)bus, size, + (long long)*hwdev->dma_mask); + return 0; + } + return 1; +} + +static dma_addr_t +nommu_map_single(struct device *hwdev, void *ptr, size_t size, + int direction) +{ + dma_addr_t bus = virt_to_bus(ptr); + if (!check_addr("map_single", hwdev, bus, size)) + return bad_dma_address; + return bus; +} + +static void nommu_unmap_single(struct device *dev, dma_addr_t addr,size_t size, + int direction) +{ +} + +/* Map a set of buffers described by scatterlist in streaming + * mode for DMA. This is the scatter-gather version of the + * above pci_map_single interface. Here the scatter gather list + * elements are each tagged with the appropriate dma address + * and length. They are obtained via sg_dma_{address,length}(SG). + * + * NOTE: An implementation may be able to use a smaller number of + * DMA address/length pairs than there are SG table elements. + * (for example via virtual mapping capabilities) + * The routine returns the number of addr/length pairs actually + * used, at most nents. + * + * Device ownership issues as mentioned above for pci_map_single are + * the same here. + */ +static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg, + int nents, int direction) +{ + int i; + + for (i = 0; i < nents; i++ ) { + struct scatterlist *s = &sg[i]; + BUG_ON(!s->page); + s->dma_address = virt_to_bus(page_address(s->page) +s->offset); + if (!check_addr("map_sg", hwdev, s->dma_address, s->length)) + return 0; + s->dma_length = s->length; + } + return nents; +} + +/* Unmap a set of streaming mode DMA translations. + * Again, cpu read rules concerning calls here are the same as for + * pci_unmap_single() above. + */ +static void nommu_unmap_sg(struct device *dev, struct scatterlist *sg, + int nents, int dir) +{ +} + +const struct dma_mapping_ops nommu_dma_ops = { + .map_single = nommu_map_single, + .unmap_single = nommu_unmap_single, + .map_sg = nommu_map_sg, + .unmap_sg = nommu_unmap_sg, + .is_phys = 1, +}; + +void __init no_iommu_init(void) +{ + if (dma_ops) + return; + + force_iommu = 0; /* no HW IOMMU */ + dma_ops = &nommu_dma_ops; +} -- cgit v0.10.2