From 17a941d854a3f7b0bb916fdeee4c9ffdcc19d8d3 Mon Sep 17 00:00:00 2001 From: Muli Ben-Yehuda Date: Wed, 11 Jan 2006 22:44:42 +0100 Subject: [PATCH] x86_64: Use function pointers to call DMA mapping functions AK: I hacked Muli's original patch a lot and there were a lot of changes - all bugs are probably to blame on me now. There were also some changes in the fall back behaviour for swiotlb - in particular it doesn't try to use GFP_DMA now anymore. Also all DMA mapping operations use the same core dma_alloc_coherent code with proper fallbacks now. And various other changes and cleanups. Known problems: iommu=force swiotlb=force together breaks needs more testing. This patch cleans up x86_64's DMA mapping dispatching code. Right now we have three possible IOMMU types: AGP GART, swiotlb and nommu, and in the future we will also have Xen's x86_64 swiotlb and other HW IOMMUs for x86_64. In order to support all of them cleanly, this patch: - introduces a struct dma_mapping_ops with function pointers for each of the DMA mapping operations of gart (AMD HW IOMMU), swiotlb (software IOMMU) and nommu (no IOMMU). - gets rid of: if (swiotlb) return swiotlb_xxx(); - PCI_DMA_BUS_IS_PHYS is now checked against the dma_ops being set This makes swiotlb faster by avoiding double copying in some cases. Signed-Off-By: Muli Ben-Yehuda Signed-Off-By: Jon D. Mason Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/proto.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'include/asm-x86_64/proto.h') diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h index 34501086afe..113e8a235b2 100644 --- a/include/asm-x86_64/proto.h +++ b/include/asm-x86_64/proto.h @@ -92,7 +92,9 @@ extern void check_efer(void); extern int unhandled_signal(struct task_struct *tsk, int sig); extern void select_idle_routine(const struct cpuinfo_x86 *c); -extern void swiotlb_init(void); + +extern void gart_parse_options(char *); +extern void __init no_iommu_init(void); extern unsigned long table_start, table_end; @@ -106,12 +108,17 @@ extern int skip_ioapic_setup; extern int acpi_ht; extern int acpi_disabled; +#ifdef CONFIG_GART_IOMMU extern int fallback_aper_order; extern int fallback_aper_force; extern int iommu_aperture; -extern int iommu_aperture_disabled; extern int iommu_aperture_allowed; +extern int iommu_aperture_disabled; extern int fix_aperture; +#else +#define iommu_aperture 0 +#define iommu_aperture_allowed 0 +#endif extern int force_iommu; extern int reboot_force; -- cgit v1.2.3-70-g09d2