hwtracing/intel_th/msu.c

65  * @_sgt:	array of block descriptors
66  * @sgt:	array of block descriptors
87  * @start_block:	oldest block in the window
88  * @block:		block number in the window
89  * @block_off:		offset into current block
90  * @wrap_count:		block wrapping handling
100 	struct scatterlist	*block;
406  * msc_win_oldest_sg() - locate the oldest block in a given window
409  * Return:	index of the block with the oldest data
417 	/* without wrapping, first block is the oldest */
422 	 * with wrapping, last written block contains both the newest and the
437 	return sg_virt(iter->block);
486 	iter->block = iter->start_block;
490 	 * start with the block with oldest data; if data has wrapped
491 	 * in this window, it should be in this block
536 	if (iter->wrap_count && iter->block == iter->start_block) {
539 			/* copied newest data from the wrapped block */
543 	/* no wrapping, check for last written block */
548 	/* block advance */
549 	if (sg_is_last(iter->block))
550 		iter->block = msc_win_base_sg(iter->win);
552 		iter->block = sg_next(iter->block);
554 	/* no wrapping, sanity check in case there is no last written block */
555 	if (!iter->wrap_count && iter->block == iter->start_block)
601 		 * If block wrapping happened, we need to visit the last block
609 		 * Second time (wrap_count==1), it's just like any other block,
612 		if (iter->block == iter->start_block && iter->wrap_count == 2) {
997 	void *block;
1005 		block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent,
1008 		if (!block)
1011 		sg_set_buf(sg_ptr, block, PAGE_SIZE);
1188  * msc_buffer_relink() - set up block descriptors for multiblock mode
1224 			 * Similarly to last window, last block should point