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Location: vmkdrivers/BLD/build/HEADERS/KLnext-vmkdrivers-asm-x64/vmkernel64/release/asm/dma-mapping.h
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* Portions Copyright 2008 VMware, Inc.
*/
#ifndef _X8664_DMA_MAPPING_H
#define _X8664_DMA_MAPPING_H 1
/*
* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
* documentation.
*/
#include <asm/scatterlist.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
struct dma_mapping_ops {
int (*mapping_error)(dma_addr_t dma_addr);
void* (*alloc_coherent)(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
void (*free_coherent)(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);
dma_addr_t (*map_single)(struct device *hwdev, void *ptr,
size_t size, int direction);
/* like map_single, but doesn't check the device mask */
dma_addr_t (*map_simple)(struct device *hwdev, char *ptr,
size_t size, int direction);
void (*unmap_single)(struct device *dev, dma_addr_t addr,
size_t size, int direction);
void (*sync_single_for_cpu)(struct device *hwdev,
dma_addr_t dma_handle, size_t size,
int direction);
void (*sync_single_for_device)(struct device *hwdev,
dma_addr_t dma_handle, size_t size,
int direction);
void (*sync_single_range_for_cpu)(struct device *hwdev,
dma_addr_t dma_handle, unsigned long offset,
size_t size, int direction);
void (*sync_single_range_for_device)(struct device *hwdev,
dma_addr_t dma_handle, unsigned long offset,
size_t size, int direction);
void (*sync_sg_for_cpu)(struct device *hwdev,
struct scatterlist *sg, int nelems,
int direction);
void (*sync_sg_for_device)(struct device *hwdev,
struct scatterlist *sg, int nelems,
int direction);
int (*map_sg)(struct device *hwdev, struct scatterlist *sg,
int nents, int direction);
void (*unmap_sg)(struct device *hwdev,
struct scatterlist *sg, int nents,
int direction);
int (*dma_supported)(struct device *hwdev, u64 mask);
int is_phys;
};
extern dma_addr_t bad_dma_address;
extern struct dma_mapping_ops* dma_ops;
extern int iommu_merge;
static inline int valid_dma_direction(int dma_direction)
{
return ((dma_direction == DMA_BIDIRECTIONAL) ||
(dma_direction == DMA_TO_DEVICE) ||
(dma_direction == DMA_FROM_DEVICE));
}
extern void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);
#if !defined(__VMKLNX__)
/**
* dma_mapping_error - Check a bus address for a mapping error
* @dma_addr: bus address previously returned by dma_map_single or dma_map_page
*
* Performs a platform-specific check to determine if the
* mapped bus address is valid for use with DMA
*
* RETURN VALUE:
* TRUE if the bus address incurred a mapping error, FALSE otherwise
*
* SEE ALSO:
* dma_map_single
*
*/
static inline int dma_mapping_error(dma_addr_t dma_addr)
{
if (dma_ops->mapping_error)
return dma_ops->mapping_error(dma_addr);
return (dma_addr == bad_dma_address);
}
/**
* dma_map_single - Map a buffer for streaming DMA use with a given device
* @hwdev: device to be used in the DMA operation
* @ptr: virtual address of the buffer
* @size: length of the buffer, in bytes
* @direction: direction of the DMA to set up
*
* Sets up any platform-specific bus connectivity required to
* make a buffer usable for a DMA operation and returns a mapped bus address
* for the buffer. The mapped address should be checked for an error using
* dma_mapping_error. When the buffer will no longer be used for DMA, the
* buffer should be unmapped using dma_unmap_single.
* 'direction' can be any one of
* DMA_BIDIRECTIONAL (the device either reads or writes the buffer),
* DMA_TO_DEVICE (the device reads the buffer),
* DMA_FROM_DEVICE (the device writes the buffer), or
* DMA_NONE (neither reads nor writes should be allowed - may not be supported
* on all platforms)
*
* RETURN VALUE:
* A bus address accessible by the device
*
* SEE ALSO:
* dma_unmap_single, dma_mapping_error
*
*/
static inline dma_addr_t
dma_map_single(struct device *hwdev, void *ptr, size_t size,
int direction)
{
BUG_ON(!valid_dma_direction(direction));
return dma_ops->map_single(hwdev, ptr, size, direction);
}
#define dma_map_page(dev,page,offset,size,dir) \
dma_map_single((dev), page_address(page)+(offset), (size), (dir))
#define dma_unmap_page dma_unmap_single
/**
* dma_unmap_single - Tear down a streaming DMA mapping for a buffer
* @dev: device that had been used in the DMA operation
* @addr: mapped bus address for the buffer, previously returned by dma_map_single
* @size: length of the buffer, in bytes
* @direction: direction of the DMA that was set up by dma_map_single
*
* Tears down the platform-specific bus connectivity that was needed to make a
* buffer usable for DMA.
* 'direction' can be any one of
* DMA_BIDIRECTIONAL (the device either reads or writes the buffer),
* DMA_TO_DEVICE (the device reads the buffer),
* DMA_FROM_DEVICE (the device writes the buffer), or
* DMA_NONE (neither reads nor writes should be allowed)
*
* RETURN VALUE:
* Does not return any value
*
* SEE ALSO:
* dma_map_single
*
*/
static inline void
dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
int direction)
{
BUG_ON(!valid_dma_direction(direction));
dma_ops->unmap_single(dev, addr, size, direction);
}
/**
* dma_sync_single_for_cpu - Allow the CPU to access a buffer that is currently DMA-mapped
* @hwdev: device to which the buffer is mapped
* @dma_handle: bus address of the buffer
* @size: length of the buffer, in bytes
* @direction: direction of the existing DMA mapping
*
* Transfers access ownership for a buffer that has been set up for DMA back to
* the CPU and synchronizes any changes that have been made by the device with
* the CPU. The bus mapping that was created with dma_map_single is not
* destroyed. Afterward, the CPU can safely read and write the buffer. The
* device should not access the buffer until access rights have been
* transferred back to the device using dma_sync_single_for_device.
*
* RETURN VALUE:
* Does not return any value
*
* SEE ALSO:
* dma_sync_single_for_device, dma_map_single
*
*/
static inline void
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_for_cpu)
dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
direction);
flush_write_buffers();
}
/**
* dma_sync_single_for_device - Re-enable device access to a DMA-mapped buffer
* @hwdev: device to which the buffer is mapped
* @dma_handle: bus address of the buffer
* @size: length of the buffer, in bytes
* @direction: direction of the existing DMA mapping
*
* Transfers access ownership back to a device from the CPU and synchronizes
* any changes that the CPU has made so that they will be visible by the device.
*
* RETURN VALUE:
* Does not return any value
*
* SEE ALSO:
* dma_sync_single_for_cpu, dma_map_single
*
*/
static inline void
dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_for_device)
dma_ops->sync_single_for_device(hwdev, dma_handle, size,
direction);
flush_write_buffers();
}
static inline void
dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_range_for_cpu) {
dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
}
flush_write_buffers();
}
static inline void
dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_range_for_device)
dma_ops->sync_single_range_for_device(hwdev, dma_handle,
offset, size, direction);
flush_write_buffers();
}
static inline void
dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_sg_for_cpu)
dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
flush_write_buffers();
}
static inline void
dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_sg_for_device) {
dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
}
flush_write_buffers();
}
/**
* dma_map_sg - Map scatter/gather buffers for DMA use with a hardware device
* @hwdev: device to be used in the DMA operations
* @sg: start of the scatter/gather list of entries to be mapped
* @nents: number of elements in the list to be mapped
* @direction: direction of the DMA, with values as in dma_map_single
*
* Sets up the platform-specific bus connectivity for each of the buffers in a
* scatterlist so that they may be used in DMA with the given hardware device.
* dma_unmap_sg should be used on these scatterlist elements when they will no
* longer be used with DMA.
*
* RETURN VALUE:
* 0 if a failure was encountered, nents if the mappings succeeded
*
* SEE ALSO:
* dma_map_single, dma_unmap_sg
*
*/
static inline int
dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
{
BUG_ON(!valid_dma_direction(direction));
return dma_ops->map_sg(hwdev, sg, nents, direction);
}
/**
* dma_unmap_sg - Unmap scatter/gather buffers that were previously mapped for DMA
* @hwdev: device to which these buffers have been mapped
* @sg: start of the scatter/gather list of entries to be unmapped
* @nents: number of elements in the list to be unmapped
* @direction: direction of the existing DMA mapping
*
* Tears down the platform-specific bus connectivity for each of the buffers in
* a scatterlist that had been previously set up for DMA using
* dma_map_sg.
*
* RETURN VALUE:
* Does not return any value
*
* SEE ALSO:
* dma_map_sg, dma_map_single
*
*/
static inline void
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
int direction)
{
BUG_ON(!valid_dma_direction(direction));
/* take out this ifdef block when we have iommu support */
dma_ops->unmap_sg(hwdev, sg, nents, direction);
}
extern int dma_supported(struct device *hwdev, u64 mask);
#else /* defined(__VMKLNX__) */
extern int dma_mapping_error(dma_addr_t dma_addr);
/* In vmklinux, virt_to_phys & phys_to_virt are real function calls, so
* until support for IOMMU is added, it's good to avoid call to
* dma_map_single() here since nommu_map_single() calls virt_to_phys().
*/
#define dma_map_page(dev,page,offset,size,dir) \
(((dma_addr_t) page_to_phys(page)) + (offset))
#define dma_unmap_page(dev,dma_address,size,dir) do { } while(0)
extern dma_addr_t
dma_map_single(struct device *hwdev, void *ptr, size_t size,
int direction);
extern void
dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
int direction);
extern void
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction);
extern void
dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction);
extern void
dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction);
extern void
dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction);
extern void
dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction);
extern void
dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction);
extern int
dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction);
extern void
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
int direction);
struct vmklnx_codma;
extern struct vmklnx_codma vmklnx_codma;
extern int vmklnx_dma_supported(struct vmklnx_codma *codma,
struct device *hwdev, u64 mask);
static inline int dma_supported(struct device *hwdev, u64 mask)
{
return vmklnx_dma_supported(&vmklnx_codma, hwdev, mask);
}
#endif /* defined(__VMKLNX__) */
/* same for gart, swiotlb, and nommu */
static inline int dma_get_cache_alignment(void)
{
return boot_cpu_data.x86_clflush_size;
}
#define dma_is_consistent(h) 1
#if !defined(__VMKLNX__)
extern int dma_set_mask(struct device *dev, u64 mask);
#else /* defined(__VMKLNX__) */
/**
* dma_set_mask - Set a device's allowable DMA mask
* @dev: device whose mask is being set
* @mask: address bitmask
*
* Sets the range in which the device can perform DMA operations.
* The mask, when bitwise-ANDed with an arbitrary machine address, expresses
* the DMA addressability of the device. This mask is used by dma_mapping
* functions (ie, dma_alloc_coherent, dma_pool_alloc) to guarantee that the
* memory allocated is usable by the device.
*
* RETURN VALUE:
* 0 on success
* -EIO if the given mask cannot be used for DMA on the system, or if the
* dma_mask has not been previously initialized.
*
*/
/* _VMKLNX_CODECHECK_: dma_set_mask */
static inline int dma_set_mask(struct device *dev, u64 mask)
{
if (!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
*dev->dma_mask = mask;
return 0;
}
#endif /* !defined(__VMKLNX__) */
static inline void
dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
{
flush_write_buffers();
}
extern struct device fallback_dev;
extern int panic_on_overflow;
#endif /* _X8664_DMA_MAPPING_H */
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