[PATCH v13 19/24] bus/pci: use the new VFIO mode API

[Anatoly Burakov]

Use the new VFIO mode API to query no-IOMMU status. This requires moving
the VFIO init earlier in the init sequence, as now checking no-IOMMU mode
is not a sysfs check but instead relies on full VFIO subsystem to be
initialized and available.

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 drivers/bus/pci/linux/pci.c |  2 +-
 lib/eal/linux/eal.c         | 15 ++++++++++-----
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/bus/pci/linux/pci.c b/drivers/bus/pci/linux/pci.c
index af37a65c45..b9fe4797fb 100644
--- a/drivers/bus/pci/linux/pci.c
+++ b/drivers/bus/pci/linux/pci.c
@@ -596,7 +596,7 @@ pci_device_iova_mode(const struct rte_pci_driver *pdrv,
 		static int is_vfio_noiommu_enabled = -1;
 
 		if (is_vfio_noiommu_enabled == -1) {
-			if (dev_vfio_noiommu_is_enabled() == 1)
+			if (dev_vfio_get_mode() == DEV_VFIO_MODE_NOIOMMU)
 				is_vfio_noiommu_enabled = 1;
 			else
 				is_vfio_noiommu_enabled = 0;
diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
index 77691a7908..11e6217826 100644
--- a/lib/eal/linux/eal.c
+++ b/lib/eal/linux/eal.c
@@ -676,6 +676,16 @@ rte_eal_init(int argc, char **argv)
 		}
 	}
 
+	/*
+	 * VFIO must be initialized before bus scan because buses need to know
+	 * about no-IOMMU mode status.
+	 */
+	if (dev_vfio_enable("vfio")) {
+		rte_eal_init_alert("Cannot init VFIO");
+		rte_errno = EAGAIN;
+		goto err_out;
+	}
+
 	if (rte_bus_scan()) {
 		rte_eal_init_alert("Cannot scan the buses for devices");
 		rte_errno = ENODEV;
@@ -771,11 +781,6 @@ rte_eal_init(int argc, char **argv)
 #endif
 	}
 
-	if (dev_vfio_enable("vfio")) {
-		rte_eal_init_alert("Cannot init VFIO");
-		rte_errno = EAGAIN;
-		goto err_out;
-	}
 	/* in secondary processes, memory init may allocate additional fbarrays
 	 * not present in primary processes, so to avoid any potential issues,
 	 * initialize memzones first.
-- 
2.52.0