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.
Static Public Member Functions
static BlockDevice *	get_default_instance ()
	Return the default block device.

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.

MBED_WEAK BlockDevice * get_default_instance ( ) [static, inherited]

Return the default block device.

Returns the default BlockDevice base on configuration json. Use the components in target.json or application config to change the default block device.

An application can override all target settings by implementing BlockDevice::get_default_instance() themselves - the default definition is weak, and calls get_target_default_instance().

Definition at line 35 of file SystemStorage.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 226 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 212 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 198 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

Reimplemented in SDBlockDevice, and BufferedBlockDevice.

Definition at line 133 of file BlockDevice.h.

Type:	Program
Mbed OS support:	Mbed OS
Created:	11 Oct 2018
Imports:	23
Forks:	0
Commits:	4
Dependents:	0
Dependencies:	1
Followers:	1

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