Bare metal PowerNV systems include a DPDK supported IOMMU that allows
IOVA=VA support. Test for the platform type and report virtual address
support if running on a PowerNV system.
Signed-off-by: David Christensen <d...@linux.vnet.ibm.com>
---
drivers/bus/pci/linux/pci.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/bus/pci/linux/pci.c b/drivers/bus/pci/linux/pci.c
index 740a2cdad..696dc177e 100644
--- a/drivers/bus/pci/linux/pci.c
+++ b/drivers/bus/pci/linux/pci.c
@@ -549,6 +549,35 @@ pci_device_iommu_support_va(const struct rte_pci_device
*dev)
bool
pci_device_iommu_support_va(__rte_unused const struct rte_pci_device *dev)
{
+ /*
+ * IOMMU is always present on a PowerNV host (IOMMUv2).
+ * IOMMU is also present in a KVM/QEMU VM (IOMMUv1) but is not
+ * currently supported by DPDK. Test for our current environment
+ * and report VA support as appropriate.
+ */
+
+ char *line = 0;
+ size_t len = 0;
+ char filename[PATH_MAX] = "/proc/cpuinfo";
+ FILE *fp = fopen(filename, "r");
+
+ if (fp == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): can't open %s: %s\n",
+ __func__, filename, strerror(errno));
+ return false;
+ }
+
+ /* Check for a PowerNV platform */
+ while (getline(&line, &len, fp) != -1) {
+ if (strstr(line, "platform") != NULL)
+ if (strstr(line, "PowerNV") != NULL) {
+ RTE_LOG(DEBUG, EAL, "Running on a PowerNV
system\n");
+ fclose(fp);
+ return true;
+ }
+ }
+ fclose(fp);
+
return false;
}
#else
--
2.18.1
