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PCI: remove PCI_DMA_BUS_IS_PHYS

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This was used by the ide, scsi and networking code in the past to
determine if they should bounce payloads.  Now that the dma mapping
always have to support dma to all physical memory (thanks to swiotlb
for non-iommu systems) there is no need to this crude hack any more.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Palmer Dabbelt <palmer@sifive.com> (for riscv)
Reviewed-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2018-04-12 09:33:30 +02:00
parent ab74cfebaf
commit 325ef1857f
31 changed files with 0 additions and 173 deletions
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23
arch/parisc/include/asm/pci.h
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@@ -87,29 +87,6 @@ struct pci_hba_data {
#define PCI_F_EXTEND 0UL
#endif /* !CONFIG_64BIT */
/*
* If the PCI device's view of memory is the same as the CPU's view of memory,
* PCI_DMA_BUS_IS_PHYS is true. The networking and block device layers use
* this boolean for bounce buffer decisions.
*/
#ifdef CONFIG_PA20
/* All PA-2.0 machines have an IOMMU. */
#define PCI_DMA_BUS_IS_PHYS 0
#define parisc_has_iommu() do { } while (0)
#else
#if defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA)
extern int parisc_bus_is_phys; /* in arch/parisc/kernel/setup.c */
#define PCI_DMA_BUS_IS_PHYS parisc_bus_is_phys
#define parisc_has_iommu() do { parisc_bus_is_phys = 0; } while (0)
#else
#define PCI_DMA_BUS_IS_PHYS 1
#define parisc_has_iommu() do { } while (0)
#endif
#endif /* !CONFIG_PA20 */
/*
** Most PCI devices (eg Tulip, NCR720) also export the same registers
** to both MMIO and I/O port space. Due to poor performance of I/O Port