block: implement drain buffers

[linux-2.6-omap-h63xx.git] / block / ll_rw_blk.c

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 3d0422f48453c0019ad8d1de25eaa4643bb379fe..768987dc2697501921a606e22078b879a24f8fd3 100644 (file)
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -725,6 +725,45 @@ void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
 
 EXPORT_SYMBOL(blk_queue_stack_limits);
 
+/**
+ * blk_queue_dma_drain - Set up a drain buffer for excess dma.
+ *
+ * @q:  the request queue for the device
+ * @buf:       physically contiguous buffer
+ * @size:      size of the buffer in bytes
+ *
+ * Some devices have excess DMA problems and can't simply discard (or
+ * zero fill) the unwanted piece of the transfer.  They have to have a
+ * real area of memory to transfer it into.  The use case for this is
+ * ATAPI devices in DMA mode.  If the packet command causes a transfer
+ * bigger than the transfer size some HBAs will lock up if there
+ * aren't DMA elements to contain the excess transfer.  What this API
+ * does is adjust the queue so that the buf is always appended
+ * silently to the scatterlist.
+ *
+ * Note: This routine adjusts max_hw_segments to make room for
+ * appending the drain buffer.  If you call
+ * blk_queue_max_hw_segments() or blk_queue_max_phys_segments() after
+ * calling this routine, you must set the limit to one fewer than your
+ * device can support otherwise there won't be room for the drain
+ * buffer.
+ */
+int blk_queue_dma_drain(struct request_queue *q, void *buf,
+                               unsigned int size)
+{
+       if (q->max_hw_segments < 2 || q->max_phys_segments < 2)
+               return -EINVAL;
+       /* make room for appending the drain */
+       --q->max_hw_segments;
+       --q->max_phys_segments;
+       q->dma_drain_buffer = buf;
+       q->dma_drain_size = size;
+
+       return 0;
+}
+
+EXPORT_SYMBOL_GPL(blk_queue_dma_drain);
+
 /**
  * blk_queue_segment_boundary - set boundary rules for segment merging
  * @q:  the request queue for the device
@@ -1379,6 +1418,16 @@ new_segment:
                bvprv = bvec;
        } /* segments in rq */
 
+       if (q->dma_drain_size) {
+               sg->page_link &= ~0x02;
+               sg = sg_next(sg);
+               sg_set_page(sg, virt_to_page(q->dma_drain_buffer),
+                           q->dma_drain_size,
+                           ((unsigned long)q->dma_drain_buffer) &
+                           (PAGE_SIZE - 1));
+               nsegs++;
+       }
+
        if (sg)
                sg_mark_end(sg);