[dpdk-dev] [PATCH v6 65/70] bus/fslmc: move vfio DMA map into bus probe

[Anatoly Burakov]

fslmc bus needs to map all allocated memory for VFIO before
device probe. This bus doesn't support hotplug, so at the time
of this call, all possible device that could be present, are
present. This will also be the place where we install VFIO
callback, although this change will come in the next patch.

Since rte_fslmc_vfio_dmamap() is now only called at bus probe,
there is no longer any need to check if DMA mappings have been
already done.

Signed-off-by: Shreyansh Jain <shreyansh.jain at nxp.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
Tested-by: Santosh Shukla <santosh.shukla at caviumnetworks.com>
Tested-by: Hemant Agrawal <hemant.agrawal at nxp.com>
Tested-by: Gowrishankar Muthukrishnan <gowrishankar.m at linux.vnet.ibm.com>
---
 drivers/bus/fslmc/fslmc_bus.c    | 11 +++++++++++
 drivers/bus/fslmc/fslmc_vfio.c   |  6 ------
 drivers/net/dpaa2/dpaa2_ethdev.c |  1 -
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/bus/fslmc/fslmc_bus.c b/drivers/bus/fslmc/fslmc_bus.c
index d6806df..d0b3261 100644
--- a/drivers/bus/fslmc/fslmc_bus.c
+++ b/drivers/bus/fslmc/fslmc_bus.c
@@ -286,6 +286,17 @@ rte_fslmc_probe(void)
 		return 0;
 	}
 
+	/* Map existing segments as well as, in case of hotpluggable memory,
+	 * install callback handler.
+	 */
+	ret = rte_fslmc_vfio_dmamap();
+	if (ret) {
+		DPAA2_BUS_ERR("Unable to DMA map existing VAs: (%d)", ret);
+		/* Not continuing ahead */
+		DPAA2_BUS_ERR("FSLMC VFIO Mapping failed");
+		return 0;
+	}
+
 	ret = fslmc_vfio_process_group();
 	if (ret) {
 		DPAA2_BUS_ERR("Unable to setup devices %d", ret);
diff --git a/drivers/bus/fslmc/fslmc_vfio.c b/drivers/bus/fslmc/fslmc_vfio.c
index 8b15312..db3eb61 100644
--- a/drivers/bus/fslmc/fslmc_vfio.c
+++ b/drivers/bus/fslmc/fslmc_vfio.c
@@ -51,7 +51,6 @@ static int container_device_fd;
 static char *g_container;
 static uint32_t *msi_intr_vaddr;
 void *(*rte_mcp_ptr_list);
-static int is_dma_done;
 
 static struct rte_dpaa2_object_list dpaa2_obj_list =
 	TAILQ_HEAD_INITIALIZER(dpaa2_obj_list);
@@ -235,9 +234,6 @@ int rte_fslmc_vfio_dmamap(void)
 {
 	int i = 0;
 
-	if (is_dma_done)
-		return 0;
-
 	if (rte_memseg_walk(fslmc_vfio_map, &i) < 0)
 		return -1;
 
@@ -254,8 +250,6 @@ int rte_fslmc_vfio_dmamap(void)
 	 */
 	vfio_map_irq_region(&vfio_group);
 
-	is_dma_done = 1;
-
 	return 0;
 }
 
diff --git a/drivers/net/dpaa2/dpaa2_ethdev.c b/drivers/net/dpaa2/dpaa2_ethdev.c
index 281483d..5b8f30a 100644
--- a/drivers/net/dpaa2/dpaa2_ethdev.c
+++ b/drivers/net/dpaa2/dpaa2_ethdev.c
@@ -1845,7 +1845,6 @@ dpaa2_dev_init(struct rte_eth_dev *eth_dev)
 
 	eth_dev->rx_pkt_burst = dpaa2_dev_prefetch_rx;
 	eth_dev->tx_pkt_burst = dpaa2_dev_tx;
-	rte_fslmc_vfio_dmamap();
 
 	DPAA2_PMD_INFO("%s: netdev created", eth_dev->data->name);
 	return 0;
-- 
2.7.4