Block device for measuring storage operations of another block device. More...

#include <ProfilingBlockDevice.h>

Public Member Functions
	ProfilingBlockDevice (BlockDevice *bd)
	Lifetime of the memory block device.
virtual	~ProfilingBlockDevice ()
	Lifetime of a block device.
virtual int	init ()
	Initialize a block device.
virtual int	deinit ()
	Deinitialize a block device.
virtual int	sync ()
	Ensure data on storage is in sync with the driver.
virtual int	read (void *buffer, bd_addr_t addr, bd_size_t size)
	Read blocks from a block device.
virtual int	program (const void *buffer, bd_addr_t addr, bd_size_t size)
	Program blocks to a block device.
virtual int	erase (bd_addr_t addr, bd_size_t size)
	Erase blocks on a block device.
virtual bd_size_t	get_read_size () const
	Get the size of a readable block.
virtual bd_size_t	get_program_size () const
	Get the size of a programmable block.
virtual bd_size_t	get_erase_size () const
	Get the size of an erasable block.
virtual bd_size_t	get_erase_size (bd_addr_t addr) const
	Get the size of an erasable block given address.
virtual int	get_erase_value () const
	Get the value of storage when erased.
virtual bd_size_t	size () const
	Get the total size of the underlying device.
void	reset ()
	Reset the current profile counts to zero.
bd_size_t	get_read_count () const
	Get number of bytes that have been read from the block device.
bd_size_t	get_program_count () const
	Get number of bytes that have been programed to the block device.
bd_size_t	get_erase_count () const
	Get number of bytes that have been erased from the block device.
virtual int	trim (bd_addr_t addr, bd_size_t size)
	Mark blocks as no longer in use.
bool	is_valid_read (bd_addr_t addr, bd_size_t size) const
	Convenience function for checking block read validity.
bool	is_valid_program (bd_addr_t addr, bd_size_t size) const
	Convenience function for checking block program validity.
bool	is_valid_erase (bd_addr_t addr, bd_size_t size) const
	Convenience function for checking block erase validity.

Detailed Description

Block device for measuring storage operations of another block device.

  #include "mbed.h"
  #include "HeapBlockDevice.h"
  #include "ProfilingBlockDevice.h"

  // Create a heap block device and profiling block device
  HeapBlockDevice mem(64*512, 512);
  ProfilingBlockDevice profiler(&mem);

  // do block device work....

  printf("read count: %lld\n", profiler.get_read_count());
  printf("program count: %lld\n", profiler.get_program_count());
  printf("erase count: %lld\n", profiler.get_erase_count());

Definition at line 47 of file ProfilingBlockDevice.h.

Constructor & Destructor Documentation

ProfilingBlockDevice ( BlockDevice * bd )

Lifetime of the memory block device.

Parameters:

bd	Block device to back the ProfilingBlockDevice

Definition at line 20 of file ProfilingBlockDevice.cpp.

virtual ~ProfilingBlockDevice ( ) [virtual]

Lifetime of a block device.

Definition at line 58 of file ProfilingBlockDevice.h.

Member Function Documentation

int deinit ( ) [virtual]

Deinitialize a block device.

Returns:: 0 on success or a negative error code on failure

Note:: The init and deinit functions do not effect profile counts

Implements BlockDevice.

Definition at line 33 of file ProfilingBlockDevice.cpp.

int erase	(	bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual]`

Erase blocks on a block device.

The state of an erased block is undefined until it has been programmed, unless get_erase_value returns a non-negative byte value

Parameters:

addr	Address of block to begin erasing
size	Size to erase in bytes, must be a multiple of erase block size

Returns:: 0 on success, negative error code on failure

Reimplemented from BlockDevice.

Definition at line 61 of file ProfilingBlockDevice.cpp.

bd_size_t get_erase_count ( ) const

Get number of bytes that have been erased from the block device.

Returns:: The number of bytes that have been erased from the block device

Definition at line 117 of file ProfilingBlockDevice.cpp.

bd_size_t get_erase_size ( ) const [virtual]

Get the size of an erasable block.

Returns:: Size of an erasable block in bytes

Note:: Must be a multiple of the program size

Reimplemented from BlockDevice.

Definition at line 80 of file ProfilingBlockDevice.cpp.

bd_size_t get_erase_size ( bd_addr_t addr ) const [virtual]

Get the size of an erasable block given address.

Parameters:

addr	Address within the erasable block

Returns:: Size of an erasable block in bytes

Note:: Must be a multiple of the program size

Reimplemented from BlockDevice.

Definition at line 85 of file ProfilingBlockDevice.cpp.

int get_erase_value ( ) const [virtual]

Get the value of storage when erased.

If get_erase_value returns a non-negative byte value, the underlying storage is set to that value when erased, and you can program storage containing that value without another erase.

Returns:: The value of storage when erased, or -1 if you can't rely on the value of erased storage

Reimplemented from BlockDevice.

Definition at line 90 of file ProfilingBlockDevice.cpp.

bd_size_t get_program_count ( ) const

Get number of bytes that have been programed to the block device.

Returns:: The number of bytes that have been programed to the block device

Definition at line 112 of file ProfilingBlockDevice.cpp.

bd_size_t get_program_size ( ) const [virtual]

Get the size of a programmable block.

Returns:: Size of a programmable block in bytes

Note:: Must be a multiple of the read size

Implements BlockDevice.

Definition at line 75 of file ProfilingBlockDevice.cpp.

bd_size_t get_read_count ( ) const

Get number of bytes that have been read from the block device.

Returns:: The number of bytes that have been read from the block device

Definition at line 107 of file ProfilingBlockDevice.cpp.

bd_size_t get_read_size ( ) const [virtual]

Get the size of a readable block.

Returns:: Size of a readable block in bytes

Implements BlockDevice.

Definition at line 70 of file ProfilingBlockDevice.cpp.

int init ( ) [virtual]

Initialize a block device.

Returns:: 0 on success or a negative error code on failure

Note:: The init and deinit functions do not effect profile counts

Implements BlockDevice.

Definition at line 28 of file ProfilingBlockDevice.cpp.

bool is_valid_erase	(	bd_addr_t	addr,
		bd_size_t	size
	)		const `[inherited]`

Convenience function for checking block erase validity.

Parameters:

addr	Address of block to begin erasing
size	Size to erase in bytes

Returns:: True if erase is valid for underlying block device

Definition at line 213 of file BlockDevice.h.

bool is_valid_program	(	bd_addr_t	addr,
		bd_size_t	size
	)		const `[inherited]`

Convenience function for checking block program validity.

Parameters:

addr	Address of block to begin writing to
size	Size to write in bytes

Returns:: True if program is valid for underlying block device

Definition at line 199 of file BlockDevice.h.

bool is_valid_read	(	bd_addr_t	addr,
		bd_size_t	size
	)		const `[inherited]`

Convenience function for checking block read validity.

Parameters:

addr	Address of block to begin reading from
size	Size to read in bytes

Returns:: True if read is valid for underlying block device

Definition at line 185 of file BlockDevice.h.

int program	(	const void *	buffer,
		bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual]`

Program blocks to a block device.

The blocks must have been erased prior to being programmed

Parameters:

buffer	Buffer of data to write to blocks
addr	Address of block to begin writing to
size	Size to write in bytes, must be a multiple of program block size

Returns:: 0 on success, negative error code on failure

Implements BlockDevice.

Definition at line 52 of file ProfilingBlockDevice.cpp.

int read	(	void *	buffer,
		bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual]`

Read blocks from a block device.

Parameters:

buffer	Buffer to read blocks into
addr	Address of block to begin reading from
size	Size to read in bytes, must be a multiple of read block size

Returns:: 0 on success, negative error code on failure

Implements BlockDevice.

Definition at line 43 of file ProfilingBlockDevice.cpp.

void reset ( void )

Reset the current profile counts to zero.

Definition at line 100 of file ProfilingBlockDevice.cpp.

bd_size_t size ( ) const [virtual]

Get the total size of the underlying device.

Returns:: Size of the underlying device in bytes

Implements BlockDevice.

Definition at line 95 of file ProfilingBlockDevice.cpp.

int sync ( ) [virtual]

Ensure data on storage is in sync with the driver.

Returns:: 0 on success or a negative error code on failure

Reimplemented from BlockDevice.

Definition at line 38 of file ProfilingBlockDevice.cpp.

virtual int trim	(	bd_addr_t	addr,
		bd_size_t	size
	)		`[virtual, inherited]`

Mark blocks as no longer in use.

This function provides a hint to the underlying block device that a region of blocks is no longer in use and may be erased without side effects. Erase must still be called before programming, but trimming allows flash-translation-layers to schedule erases when the device is not busy.

Parameters:

addr	Address of block to mark as unused
size	Size to mark as unused in bytes, must be a multiple of erase block size

Returns:: 0 on success, negative error code on failure

Definition at line 120 of file BlockDevice.h.

Type:	Program
Mbed OS support:	Mbed OS
Created:	29 Mar 2018
Imports:	22
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	6

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