mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
17a941d854
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 <mulix@mulix.org>
Signed-Off-By: Jon D. Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
#ifndef __x8664_PCI_H
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#define __x8664_PCI_H
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#include <linux/config.h>
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#include <asm/io.h>
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#ifdef __KERNEL__
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#include <linux/mm.h> /* for struct page */
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/* Can be used to override the logic in pci_scan_bus for skipping
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already-configured bus numbers - to be used for buggy BIOSes
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or architectures with incomplete PCI setup by the loader */
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#ifdef CONFIG_PCI
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extern unsigned int pcibios_assign_all_busses(void);
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#else
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#define pcibios_assign_all_busses() 0
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#endif
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#define pcibios_scan_all_fns(a, b) 0
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extern int no_iommu, force_iommu;
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extern unsigned long pci_mem_start;
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#define PCIBIOS_MIN_IO 0x1000
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#define PCIBIOS_MIN_MEM (pci_mem_start)
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#define PCIBIOS_MIN_CARDBUS_IO 0x4000
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void pcibios_config_init(void);
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struct pci_bus * pcibios_scan_root(int bus);
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extern int (*pci_config_read)(int seg, int bus, int dev, int fn, int reg, int len, u32 *value);
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extern int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int len, u32 value);
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void pcibios_set_master(struct pci_dev *dev);
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void pcibios_penalize_isa_irq(int irq, int active);
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struct irq_routing_table *pcibios_get_irq_routing_table(void);
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int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <asm/scatterlist.h>
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#include <linux/string.h>
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#include <asm/page.h>
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#include <linux/dma-mapping.h> /* for have_iommu */
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extern int iommu_setup(char *opt);
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/* The PCI address space does equal the physical memory
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* address space. The networking and block device layers use
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* this boolean for bounce buffer decisions
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*
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* On AMD64 it mostly equals, but we set it to zero if a hardware
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* IOMMU (gart) of sotware IOMMU (swiotlb) is available.
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*/
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#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
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#ifdef CONFIG_GART_IOMMU
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/*
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* x86-64 always supports DAC, but sometimes it is useful to force
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* devices through the IOMMU to get automatic sg list merging.
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* Optional right now.
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*/
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extern int iommu_sac_force;
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#define pci_dac_dma_supported(pci_dev, mask) (!iommu_sac_force)
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#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \
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dma_addr_t ADDR_NAME;
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#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \
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__u32 LEN_NAME;
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#define pci_unmap_addr(PTR, ADDR_NAME) \
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((PTR)->ADDR_NAME)
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#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \
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(((PTR)->ADDR_NAME) = (VAL))
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#define pci_unmap_len(PTR, LEN_NAME) \
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((PTR)->LEN_NAME)
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#define pci_unmap_len_set(PTR, LEN_NAME, VAL) \
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(((PTR)->LEN_NAME) = (VAL))
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#else
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/* No IOMMU */
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#define pci_dac_dma_supported(pci_dev, mask) 1
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#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
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#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
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#define pci_unmap_addr(PTR, ADDR_NAME) (0)
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#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
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#define pci_unmap_len(PTR, LEN_NAME) (0)
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#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
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#endif
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#include <asm-generic/pci-dma-compat.h>
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static inline dma64_addr_t
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pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
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{
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return ((dma64_addr_t) page_to_phys(page) +
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(dma64_addr_t) offset);
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}
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static inline struct page *
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pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
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{
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return virt_to_page(__va(dma_addr));
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}
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static inline unsigned long
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pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
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{
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return (dma_addr & ~PAGE_MASK);
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}
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static inline void
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pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
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{
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}
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static inline void
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pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
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{
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flush_write_buffers();
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}
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#ifdef CONFIG_PCI
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static inline void pci_dma_burst_advice(struct pci_dev *pdev,
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enum pci_dma_burst_strategy *strat,
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unsigned long *strategy_parameter)
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{
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*strat = PCI_DMA_BURST_INFINITY;
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*strategy_parameter = ~0UL;
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}
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#endif
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#define HAVE_PCI_MMAP
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extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
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enum pci_mmap_state mmap_state, int write_combine);
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static inline void pcibios_add_platform_entries(struct pci_dev *dev)
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{
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}
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#endif /* __KERNEL__ */
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/* generic pci stuff */
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#ifdef CONFIG_PCI
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#include <asm-generic/pci.h>
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#endif
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#endif /* __x8664_PCI_H */
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