This patch introduce DMA device library implementation which includes
configuration and I/O with the DMA devices.

Signed-off-by: Chengwen Feng <redacted>
Acked-by: Bruce Richardson <redacted>
Acked-by: Morten Brørup <redacted>
---

<snip>

+
+static int
+dmadev_shared_data_prepare(void)
+{
+	const struct rte_memzone *mz;
+
+	if (dmadev_shared_data == NULL) {
+		if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
+			/* Allocate port data and ownership shared memory. */
+			mz = rte_memzone_reserve(mz_rte_dmadev_data,
+					 sizeof(*dmadev_shared_data),
+					 rte_socket_id(), 0);
+		} else
+			mz = rte_memzone_lookup(mz_rte_dmadev_data);
+		if (mz == NULL)
+			return -ENOMEM;

This memzone is not free'd anywhere in the library, I would suggest 
freeing as part of the release pmd function.

<snip>

Reviewed-by: Conor Walsh <redacted>