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Improved DMA adjacency descriptor prefetch function in performance mode #264

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Improved DMA adjacency descriptor prefetch function in performance mode #264

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16 changes: 16 additions & 0 deletions XDMA/linux-kernel/xdma/libxdma.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4081,6 +4081,22 @@ int xdma_performance_submit(struct xdma_dev *xdev, struct xdma_engine *engine)
pr_err("Failed to set desc control\n");
goto err_dma_desc;
}

/************ support prefetching adjacent descriptors -- start ************/

/* fill in adjacent numbers */
transfer->desc_adjacent = transfer->desc_num - 1;

for (i = 0; i < transfer->desc_num; i++) {
u32 next_adj = xdma_get_next_adj(transfer->desc_num - i - 1,
(transfer->desc_virt + i)->next_lo);

xdma_desc_adjacent(transfer->desc_virt + i, next_adj);
dbg_desc("prefetch: dma desc addr: %x_%x, control:%x", transfer->desc_virt[i].next_hi, transfer->desc_virt[i].next_lo, transfer->desc_virt[i].control);
}

/************ support prefetching adjacent descriptors -- end ************/

/* create a linked loop */
xdma_desc_link(transfer->desc_virt + transfer->desc_num - 1,
transfer->desc_virt, transfer->desc_bus);
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