svm_fifo.c File Reference

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Functions
svm_fifo_t *	svm_fifo_create (u32 data_size_in_bytes)
	create an svm fifo, in the current heap. More...
static ooo_segment_t *	ooo_segment_new (svm_fifo_t *f, u32 start, u32 length)
static void	ooo_segment_del (svm_fifo_t *f, u32 index)
static void	ooo_segment_add (svm_fifo_t *f, u32 offset, u32 length)
	Add segment to fifo's out-of-order segment list. More...
static int	ooo_segment_try_collect (svm_fifo_t *f, u32 n_bytes_enqueued)
	Removes segments that can now be enqueued because the fifo's tail has advanced. More...
static int	svm_fifo_enqueue_internal (svm_fifo_t *f, int pid, u32 max_bytes, u8 *copy_from_here)
int	svm_fifo_enqueue_nowait (svm_fifo_t *f, int pid, u32 max_bytes, u8 *copy_from_here)
static int	svm_fifo_enqueue_with_offset_internal2 (svm_fifo_t *f, int pid, u32 offset, u32 required_bytes, u8 *copy_from_here)
	Enqueue a future segment. More...
int	svm_fifo_enqueue_with_offset (svm_fifo_t *f, int pid, u32 offset, u32 required_bytes, u8 *copy_from_here)
static int	svm_fifo_dequeue_internal2 (svm_fifo_t *f, int pid, u32 max_bytes, u8 *copy_here)
int	svm_fifo_dequeue_nowait (svm_fifo_t *f, int pid, u32 max_bytes, u8 *copy_here)
int	svm_fifo_peek (svm_fifo_t *f, int pid, u32 offset, u32 max_bytes, u8 *copy_here)
int	svm_fifo_dequeue_drop (svm_fifo_t *f, int pid, u32 max_bytes)

Function Documentation

static void ooo_segment_add ( svm_fifo_t *  f, u32  offset, u32  length  )

static

Add segment to fifo's out-of-order segment list.

Takes care of merging adjacent segments and removing overlapping ones.

Definition at line 103 of file svm_fifo.c.

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static void ooo_segment_del ( svm_fifo_t *  f, u32  index  )

inlinestatic

Definition at line 74 of file svm_fifo.c.

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static ooo_segment_t* ooo_segment_new ( svm_fifo_t *  f, u32  start, u32  length  )

inlinestatic

Definition at line 59 of file svm_fifo.c.

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static int ooo_segment_try_collect ( svm_fifo_t *  f, u32  n_bytes_enqueued  )

static

Removes segments that can now be enqueued because the fifo's tail has advanced.

Returns the number of bytes added to tail.

Definition at line 253 of file svm_fifo.c.

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svm_fifo_t* svm_fifo_create

(

u32

data_size_in_bytes

)

create an svm fifo, in the current heap.

Fails vs blow up the process

Definition at line 20 of file svm_fifo.c.

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int svm_fifo_dequeue_drop	(	svm_fifo_t *	f,
		int	pid,
		u32	max_bytes
	)

Definition at line 527 of file svm_fifo.c.

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static int svm_fifo_dequeue_internal2 ( svm_fifo_t *  f, int  pid, u32  max_bytes, u8 *  copy_here  )

static

Definition at line 433 of file svm_fifo.c.

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int svm_fifo_dequeue_nowait	(	svm_fifo_t *	f,
		int	pid,
		u32	max_bytes,
		u8 *	copy_here
	)

Definition at line 484 of file svm_fifo.c.

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static int svm_fifo_enqueue_internal ( svm_fifo_t *  f, int  pid, u32  max_bytes, u8 *  copy_from_here  )

static

Definition at line 302 of file svm_fifo.c.

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int svm_fifo_enqueue_nowait	(	svm_fifo_t *	f,
		int	pid,
		u32	max_bytes,
		u8 *	copy_from_here
	)

Definition at line 359 of file svm_fifo.c.

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int svm_fifo_enqueue_with_offset	(	svm_fifo_t *	f,
		int	pid,
		u32	offset,
		u32	required_bytes,
		u8 *	copy_from_here
	)

Definition at line 422 of file svm_fifo.c.

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static int svm_fifo_enqueue_with_offset_internal2 ( svm_fifo_t *  f, int  pid, u32  offset, u32  required_bytes, u8 *  copy_from_here  )

static

Enqueue a future segment.

Two choices: either copies the entire segment, or copies nothing Returns 0 of the entire segment was copied Returns -1 if none of the segment was copied due to lack of space

Definition at line 372 of file svm_fifo.c.

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int svm_fifo_peek	(	svm_fifo_t *	f,
		int	pid,
		u32	offset,
		u32	max_bytes,
		u8 *	copy_here
	)

Definition at line 491 of file svm_fifo.c.

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