/**
* scif_rb_write - Write a message to the RB
* @rb: ring buffer
* @msg: buffer to send the message. Must be at least size bytes long
* @size: the size (in bytes) to be copied to the RB
*
* This API does not block if there isn't enough space in the RB.
* Returns: 0 on success or -ENOMEM on failure
*/
int scif_rb_write(struct scif_rb *rb, void *msg, u32 size)
{
void *header;
if (scif_rb_space(rb) < size)
return -ENOMEM;
header = rb->rb_base + rb->current_write_offset;
memcpy_torb(rb, header, msg, size);
/*
* Wait until scif_rb_commit(). Update the local ring
* buffer data, not the shared data until commit.
*/
rb->current_write_offset =
(rb->current_write_offset + size) & (rb->size - 1);
return 0;
}
/**
* micscif_rb_write - Write one package to the given ring buffer
* @rb - The RingBuffer context
* @msg - The package to be put in the ring buffer
* @size - the size (in bytes) you want to copy
*
* This API does not block if there isn't enough space in the RB.
*/
int micscif_rb_write(struct micscif_rb *rb,
void *msg,
uint32_t size)
{
void *header;
int ret = 0;
if ((uint32_t)micscif_rb_space(rb) < size)
return -ENOMEM;
header = (char*)rb->rb_base + rb->current_write_offset;
ret = memcpy_torb(rb, header, msg, size);
if (!ret) {
/*
* XPU_RACE_CONDITION: Don't do anything here!
* Wait until micscif_rb_commit()
* Update the local ring buffer data, not the shared data until commit.
*/
rb->old_current_write_offset = rb->current_write_offset;
rb->current_write_offset = (rb->current_write_offset + size) & (rb->size - 1);
}
return ret;
}
