Virtual Memory Management

Functions

Virtual Memory Management

HIP API

Collaboration diagram for Virtual Memory Management:

Functions
hipError_t	hipMemAddressFree (void *devPtr, size_t size)
	Frees an address range reservation made via hipMemAddressReserve.
hipError_t	hipMemAddressReserve (void **ptr, size_t size, size_t alignment, void *addr, unsigned long long flags)
	Reserves an address range.
hipError_t	hipMemCreate (hipMemGenericAllocationHandle_t *handle, size_t size, const hipMemAllocationProp *prop, unsigned long long flags)
	Creates a memory allocation described by the properties and size.
hipError_t	hipMemExportToShareableHandle (void *shareableHandle, hipMemGenericAllocationHandle_t handle, hipMemAllocationHandleType handleType, unsigned long long flags)
	Exports an allocation to a requested shareable handle type.
hipError_t	hipMemGetAccess (unsigned long long *flags, const hipMemLocation *location, void *ptr)
	Get the access flags set for the given location and ptr.
hipError_t	hipMemGetAllocationGranularity (size_t *granularity, const hipMemAllocationProp *prop, hipMemAllocationGranularity_flags option)
	Calculates either the minimal or recommended granularity.
hipError_t	hipMemGetAllocationPropertiesFromHandle (hipMemAllocationProp *prop, hipMemGenericAllocationHandle_t handle)
	Retrieve the property structure of the given handle.
hipError_t	hipMemImportFromShareableHandle (hipMemGenericAllocationHandle_t *handle, void *osHandle, hipMemAllocationHandleType shHandleType)
	Imports an allocation from a requested shareable handle type.
hipError_t	hipMemMap (void *ptr, size_t size, size_t offset, hipMemGenericAllocationHandle_t handle, unsigned long long flags)
	Maps an allocation handle to a reserved virtual address range.
hipError_t	hipMemMapArrayAsync (hipArrayMapInfo *mapInfoList, unsigned int count, hipStream_t stream)
	Maps or unmaps subregions of sparse HIP arrays and sparse HIP mipmapped arrays.
hipError_t	hipMemRelease (hipMemGenericAllocationHandle_t handle)
	Release a memory handle representing a memory allocation which was previously allocated through hipMemCreate.
hipError_t	hipMemRetainAllocationHandle (hipMemGenericAllocationHandle_t *handle, void *addr)
	Returns the allocation handle of the backing memory allocation given the address.
hipError_t	hipMemSetAccess (void *ptr, size_t size, const hipMemAccessDesc *desc, size_t count)
	Set the access flags for each location specified in desc for the given virtual address range.
hipError_t	hipMemUnmap (void *ptr, size_t size)
	Unmap memory allocation of a given address range.

Detailed Description

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This section describes the virtual memory management functions of HIP runtime API.

Note

Please note, the virtual memory management functions of HIP runtime API are implemented on Linux, under development on Windows. The following Virtual Memory Management APIs are not (yet) supported in HIP:

• hipMemMapArrayAsync

Function Documentation

◆ hipMemAddressFree()

hipError_t hipMemAddressFree	(	void *	devPtr,
		size_t	size
	)

Frees an address range reservation made via hipMemAddressReserve.

Parameters

[in]	devPtr	- starting address of the range.
[in]	size	- size of the range.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemAddressReserve()

hipError_t hipMemAddressReserve	(	void **	ptr,
		size_t	size,
		size_t	alignment,
		void *	addr,
		unsigned long long	flags
	)

Reserves an address range.

Parameters

[out]	ptr	- starting address of the reserved range.
[in]	size	- size of the reservation.
[in]	alignment	- alignment of the address.
[in]	addr	- requested starting address of the range.
[in]	flags	- currently unused, must be zero.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemCreate()

hipError_t hipMemCreate	(	hipMemGenericAllocationHandle_t *	handle,
		size_t	size,
		const hipMemAllocationProp *	prop,
		unsigned long long	flags
	)

Creates a memory allocation described by the properties and size.

Parameters

[out]	handle	- value of the returned handle.
[in]	size	- size of the allocation.
[in]	prop	- properties of the allocation.
[in]	flags	- currently unused, must be zero.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemExportToShareableHandle()

hipError_t hipMemExportToShareableHandle	(	void *	shareableHandle,
		hipMemGenericAllocationHandle_t	handle,
		hipMemAllocationHandleType	handleType,
		unsigned long long	flags
	)

Exports an allocation to a requested shareable handle type.

Parameters

[out]	shareableHandle	- value of the returned handle.
[in]	handle	- handle to share.
[in]	handleType	- type of the shareable handle.
[in]	flags	- currently unused, must be zero.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemGetAccess()

hipError_t hipMemGetAccess	(	unsigned long long *	flags,
		const hipMemLocation *	location,
		void *	ptr
	)

Get the access flags set for the given location and ptr.

Parameters

[out]	flags	- flags for this location.
[in]	location	- target location.
[in]	ptr	- address to check the access flags.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemGetAllocationGranularity()

hipError_t hipMemGetAllocationGranularity	(	size_t *	granularity,
		const hipMemAllocationProp *	prop,
		hipMemAllocationGranularity_flags	option
	)

Calculates either the minimal or recommended granularity.

Parameters

[out]	granularity	- returned granularity.
[in]	prop	- location properties.
[in]	option	- determines which granularity to return.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemGetAllocationPropertiesFromHandle()

hipError_t hipMemGetAllocationPropertiesFromHandle	(	hipMemAllocationProp *	prop,
		hipMemGenericAllocationHandle_t	handle
	)

Retrieve the property structure of the given handle.

Parameters

[out]	prop	- properties of the given handle.
[in]	handle	- handle to perform the query on.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemImportFromShareableHandle()

hipError_t hipMemImportFromShareableHandle	(	hipMemGenericAllocationHandle_t *	handle,
		void *	osHandle,
		hipMemAllocationHandleType	shHandleType
	)

Imports an allocation from a requested shareable handle type.

Parameters

[out]	handle	- returned value.
[in]	osHandle	- shareable handle representing the memory allocation.
[in]	shHandleType	- handle type.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemMap()

hipError_t hipMemMap	(	void *	ptr,
		size_t	size,
		size_t	offset,
		hipMemGenericAllocationHandle_t	handle,
		unsigned long long	flags
	)

Maps an allocation handle to a reserved virtual address range.

Parameters

[in]	ptr	- address where the memory will be mapped.
[in]	size	- size of the mapping.
[in]	offset	- offset into the memory, currently must be zero.
[in]	handle	- memory allocation to be mapped.
[in]	flags	- currently unused, must be zero.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemMapArrayAsync()

hipError_t hipMemMapArrayAsync	(	hipArrayMapInfo *	mapInfoList,
		unsigned int	count,
		hipStream_t	stream
	)

Maps or unmaps subregions of sparse HIP arrays and sparse HIP mipmapped arrays.

Parameters

[in]	mapInfoList	- list of hipArrayMapInfo.
[in]	count	- number of hipArrayMapInfo in mapInfoList.
[in]	stream	- stream identifier for the stream to use for map or unmap operations.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is under development. Currently it is not supported on AMD GPUs and returns hipErrorNotSupported.

◆ hipMemRelease()

hipError_t hipMemRelease

(

hipMemGenericAllocationHandle_t

handle

)

Release a memory handle representing a memory allocation which was previously allocated through hipMemCreate.

Parameters

[in]

handle

- handle of the memory allocation.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemRetainAllocationHandle()

hipError_t hipMemRetainAllocationHandle	(	hipMemGenericAllocationHandle_t *	handle,
		void *	addr
	)

Returns the allocation handle of the backing memory allocation given the address.

Parameters

[out]	handle	- handle representing addr.
[in]	addr	- address to look up.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemSetAccess()

hipError_t hipMemSetAccess	(	void *	ptr,
		size_t	size,
		const hipMemAccessDesc *	desc,
		size_t	count
	)

Set the access flags for each location specified in desc for the given virtual address range.

Parameters

[in]	ptr	- starting address of the virtual address range.
[in]	size	- size of the range.
[in]	desc	- array of hipMemAccessDesc.
[in]	count	- number of hipMemAccessDesc in desc.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.

◆ hipMemUnmap()

hipError_t hipMemUnmap	(	void *	ptr,
		size_t	size
	)

Unmap memory allocation of a given address range.

Parameters

[in]	ptr	- starting address of the range to unmap.
[in]	size	- size of the virtual address range.

Returns

hipSuccess, hipErrorInvalidValue, hipErrorNotSupported

Warning

This API is marked as Beta. While this feature is complete, it can change and might have outstanding issues.

Note

This API is implemented on Linux and is under development on Microsoft Windows.