From: Keith Busch <kbusch@xxxxxxxxxx>
In preparing for dma mapping integrity metadata, move the common dma
setup to a helper.
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
---
block/blk-mq-dma.c | 60 +++++++++++++++++++++++++---------------------
1 file changed, 33 insertions(+), 27 deletions(-)
diff --git a/block/blk-mq-dma.c b/block/blk-mq-dma.c
index 988c27667df67..bc694fecb39dc 100644
--- a/block/blk-mq-dma.c
+++ b/block/blk-mq-dma.c
@@ -135,36 +135,12 @@ static struct blk_map_iter blk_rq_map_iter(struct request *rq)
};
}
-/**
- * blk_rq_dma_map_iter_start - map the first DMA segment for a request
- * @req: request to map
- * @dma_dev: device to map to
- * @state: DMA IOVA state
- * @iter: block layer DMA iterator
- *
- * Start DMA mapping @req to @dma_dev. @state and @iter are provided by the
- * caller and don't need to be initialized. @state needs to be stored for use
- * at unmap time, @iter is only needed at map time.
- *
- * Returns %false if there is no segment to map, including due to an error, or
- * %true ft it did map a segment.
- *
- * If a segment was mapped, the DMA address for it is returned in @iter.addr and
- * the length in @iter.len. If no segment was mapped the status code is
- * returned in @iter.status.
- *
- * The caller can call blk_rq_dma_map_coalesce() to check if further segments
- * need to be mapped after this, or go straight to blk_rq_dma_map_iter_next()
- * to try to map the following segments.
- */
-bool blk_rq_dma_map_iter_start(struct request *req, struct device *dma_dev,
- struct dma_iova_state *state, struct blk_dma_iter *iter)
+static bool blk_dma_map_iter_start(struct request *req, struct device *dma_dev,
+ struct dma_iova_state *state, struct blk_dma_iter *iter,
+ unsigned int total_len)
{
- unsigned int total_len = blk_rq_payload_bytes(req);
-
memset(&iter->p2pdma, 0, sizeof(iter->p2pdma));
iter->status = BLK_STS_OK;
- iter->iter = blk_rq_map_iter(req);
/*
* Grab the first segment ASAP because we'll need it to check for P2P
@@ -194,6 +170,36 @@ bool blk_rq_dma_map_iter_start(struct request *req, struct device *dma_dev,
return blk_rq_dma_map_iova(req, dma_dev, state, iter);
return blk_dma_map_direct(req, dma_dev, iter);
}
+
+/**
+ * blk_rq_dma_map_iter_start - map the first DMA segment for a request
+ * @req: request to map
+ * @dma_dev: device to map to
+ * @state: DMA IOVA state
+ * @iter: block layer DMA iterator
+ *
+ * Start DMA mapping @req to @dma_dev. @state and @iter are provided by the
+ * caller and don't need to be initialized. @state needs to be stored for use
+ * at unmap time, @iter is only needed at map time.
+ *
+ * Returns %false if there is no segment to map, including due to an error, or
+ * %true ft it did map a segment.
+ *
+ * If a segment was mapped, the DMA address for it is returned in @iter.addr and
+ * the length in @iter.len. If no segment was mapped the status code is
+ * returned in @iter.status.
+ *
+ * The caller can call blk_rq_dma_map_coalesce() to check if further segments
+ * need to be mapped after this, or go straight to blk_rq_dma_map_iter_next()
+ * to try to map the following segments.
+ */
+bool blk_rq_dma_map_iter_start(struct request *req, struct device *dma_dev,
+ struct dma_iova_state *state, struct blk_dma_iter *iter)
+{
+ iter->iter = blk_rq_map_iter(req);
+ return blk_dma_map_iter_start(req, dma_dev, state, iter,
+ blk_rq_payload_bytes(req));
+}
EXPORT_SYMBOL_GPL(blk_rq_dma_map_iter_start);
/**
--
2.47.3
