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Release 4.14 arch/powerpc/include/asm/dma-mapping.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2004 IBM
 *
 * Implements the generic device dma API for powerpc.
 * the pci and vio busses
 */
#ifndef _ASM_DMA_MAPPING_H

#define _ASM_DMA_MAPPING_H
#ifdef __KERNEL__

#include <linux/types.h>
#include <linux/cache.h>
/* need struct page definitions */
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <asm/io.h>
#include <asm/swiotlb.h>

/* Some dma direct funcs must be visible for use in other dma_ops */
extern void *__dma_direct_alloc_coherent(struct device *dev, size_t size,
					 dma_addr_t *dma_handle, gfp_t flag,
					 unsigned long attrs);
extern void __dma_direct_free_coherent(struct device *dev, size_t size,
				       void *vaddr, dma_addr_t dma_handle,
				       unsigned long attrs);
extern int dma_direct_mmap_coherent(struct device *dev,
				    struct vm_area_struct *vma,
				    void *cpu_addr, dma_addr_t handle,
				    size_t size, unsigned long attrs);

#ifdef CONFIG_NOT_COHERENT_CACHE
/*
 * DMA-consistent mapping functions for PowerPCs that don't support
 * cache snooping.  These allocate/free a region of uncached mapped
 * memory space for use with DMA devices.  Alternatively, you could
 * allocate the space "normally" and use the cache management functions
 * to ensure it is consistent.
 */
struct device;
extern void *__dma_alloc_coherent(struct device *dev, size_t size,
				  dma_addr_t *handle, gfp_t gfp);
extern void __dma_free_coherent(size_t size, void *vaddr);
extern void __dma_sync(void *vaddr, size_t size, int direction);
extern void __dma_sync_page(struct page *page, unsigned long offset,
				 size_t size, int direction);
extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr);

#else /* ! CONFIG_NOT_COHERENT_CACHE */
/*
 * Cache coherent cores.
 */


#define __dma_alloc_coherent(dev, gfp, size, handle)	NULL

#define __dma_free_coherent(size, addr)		((void)0)

#define __dma_sync(addr, size, rw)		((void)0)

#define __dma_sync_page(pg, off, sz, rw)	((void)0)

#endif /* ! CONFIG_NOT_COHERENT_CACHE */


static inline unsigned long device_to_mask(struct device *dev) { if (dev->dma_mask && *dev->dma_mask) return *dev->dma_mask; /* Assume devices without mask can take 32 bit addresses */ return 0xfffffffful; }

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Mark Nelson34100.00%1100.00%
Total34100.00%1100.00%

/* * Available generic sets of operations */ #ifdef CONFIG_PPC64 extern struct dma_map_ops dma_iommu_ops; #endif extern const struct dma_map_ops dma_direct_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) { /* We don't handle the NULL dev case for ISA for now. We could * do it via an out of line call but it is not needed for now. The * only ISA DMA device we support is the floppy and we have a hack * in the floppy driver directly to get a device for us. */ return NULL; }

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Anton Blanchard1473.68%125.00%
Bart Van Assche421.05%250.00%
FUJITA Tomonori15.26%125.00%
Total19100.00%4100.00%

/* * get_dma_offset() * * Get the dma offset on configurations where the dma address can be determined * from the physical address by looking at a simple offset. Direct dma and * swiotlb use this function, but it is typically not used by implementations * with an iommu. */
static inline dma_addr_t get_dma_offset(struct device *dev) { if (dev) return dev->archdata.dma_offset; return PCI_DRAM_OFFSET; }

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Becky Bruce26100.00%2100.00%
Total26100.00%2100.00%


static inline void set_dma_offset(struct device *dev, dma_addr_t off) { if (dev) dev->archdata.dma_offset = off; }

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Becky Bruce27100.00%1100.00%
Total27100.00%1100.00%

/* this will be removed soon */ #define flush_write_buffers() #define HAVE_ARCH_DMA_SET_MASK 1 extern int dma_set_mask(struct device *dev, u64 dma_mask); extern u64 __dma_get_required_mask(struct device *dev);
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) { #ifdef CONFIG_SWIOTLB struct dev_archdata *sd = &dev->archdata; if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr) return false; #endif if (!dev->dma_mask) return false; return addr + size - 1 <= *dev->dma_mask; }

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FUJITA Tomonori6894.44%250.00%
Jan Beulich22.78%125.00%
Joe Perches22.78%125.00%
Total72100.00%4100.00%


static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { return paddr + get_dma_offset(dev); }

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FUJITA Tomonori2295.65%150.00%
Becky Bruce14.35%150.00%
Total23100.00%2100.00%


static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) { return daddr - get_dma_offset(dev); }

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FUJITA Tomonori2295.65%150.00%
Becky Bruce14.35%150.00%
Total23100.00%2100.00%

#define ARCH_HAS_DMA_MMAP_COHERENT
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync(vaddr, size, (int)direction); }

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PersonTokensPropCommitsCommitProp
Tom Rini2969.05%125.00%
Stephen Rothwell716.67%125.00%
Ralf Bächle511.90%125.00%
Andrew Morton12.38%125.00%
Total42100.00%4100.00%

#endif /* __KERNEL__ */ #endif /* _ASM_DMA_MAPPING_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard16228.17%13.23%
FUJITA Tomonori12321.39%516.13%
Becky Bruce11319.65%412.90%
Tom Rini356.09%13.23%
Mark Nelson345.91%13.23%
Benjamin Herrenschmidt284.87%516.13%
Marek Szyprowski274.70%13.23%
Stephen Rothwell111.91%13.23%
Gavin Shan91.57%13.23%
Krzysztof Kozlowski61.04%13.23%
Ralf Bächle50.87%13.23%
Bart Van Assche50.87%26.45%
Andrzej Pietrasiewicz40.70%13.23%
Christoph Hellwig40.70%13.23%
Arnd Bergmann30.52%13.23%
Jan Beulich20.35%13.23%
Joe Perches20.35%13.23%
Andrew Morton10.17%13.23%
Greg Kroah-Hartman10.17%13.23%
Total575100.00%31100.00%
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