pci: get IOMMU class on Linux

[dpdk.git] / lib / librte_eal / linuxapp / eal / eal_pci.c

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index b1d6fbd..b4dbf95 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -45,6 +45,7 @@
 #include "eal_filesystem.h"
 #include "eal_private.h"
 #include "eal_pci_init.h"
+#include "eal_vfio.h"
 
 /**
  * @file
@@ -487,12 +488,98 @@ error:
        return -1;
 }
 
+/*
+ * Is pci device bound to any kdrv
+ */
+static inline int
+pci_one_device_is_bound(void)
+{
+       struct rte_pci_device *dev = NULL;
+       int ret = 0;
+
+       FOREACH_DEVICE_ON_PCIBUS(dev) {
+               if (dev->kdrv == RTE_KDRV_UNKNOWN ||
+                   dev->kdrv == RTE_KDRV_NONE) {
+                       continue;
+               } else {
+                       ret = 1;
+                       break;
+               }
+       }
+       return ret;
+}
+
+/*
+ * Any one of the device bound to uio
+ */
+static inline int
+pci_one_device_bound_uio(void)
+{
+       struct rte_pci_device *dev = NULL;
+
+       FOREACH_DEVICE_ON_PCIBUS(dev) {
+               if (dev->kdrv == RTE_KDRV_IGB_UIO ||
+                  dev->kdrv == RTE_KDRV_UIO_GENERIC) {
+                       return 1;
+               }
+       }
+       return 0;
+}
+
+/*
+ * Any one of the device has iova as va
+ */
+static inline int
+pci_one_device_has_iova_va(void)
+{
+       struct rte_pci_device *dev = NULL;
+       struct rte_pci_driver *drv = NULL;
+
+       FOREACH_DRIVER_ON_PCIBUS(drv) {
+               if (drv && drv->drv_flags & RTE_PCI_DRV_IOVA_AS_VA) {
+                       FOREACH_DEVICE_ON_PCIBUS(dev) {
+                               if (dev->kdrv == RTE_KDRV_VFIO &&
+                                   rte_pci_match(drv, dev))
+                                       return 1;
+                       }
+               }
+       }
+       return 0;
+}
+
 /*
  * Get iommu class of PCI devices on the bus.
  */
 enum rte_iova_mode
 rte_pci_get_iommu_class(void)
 {
+       bool is_bound;
+       bool is_vfio_noiommu_enabled = true;
+       bool has_iova_va;
+       bool is_bound_uio;
+
+       is_bound = pci_one_device_is_bound();
+       if (!is_bound)
+               return RTE_IOVA_DC;
+
+       has_iova_va = pci_one_device_has_iova_va();
+       is_bound_uio = pci_one_device_bound_uio();
+#ifdef VFIO_PRESENT
+       is_vfio_noiommu_enabled = vfio_noiommu_is_enabled() == true ?
+                                       true : false;
+#endif
+
+       if (has_iova_va && !is_bound_uio && !is_vfio_noiommu_enabled)
+               return RTE_IOVA_VA;
+
+       if (has_iova_va) {
+               RTE_LOG(WARNING, EAL, "Some devices want iova as va but pa will be used because.. ");
+               if (is_vfio_noiommu_enabled)
+                       RTE_LOG(WARNING, EAL, "vfio-noiommu mode configured\n");
+               if (is_bound_uio)
+                       RTE_LOG(WARNING, EAL, "few device bound to UIO\n");
+       }
+
        return RTE_IOVA_PA;
 }