[dpdk-dev] [PATCH v8 3/4] eal/linux: vfio: ignore mapping for ioport region

[Santosh Shukla <sshukla@mvista.com>]

vfio_pci_mmap() try to map all pci bars. ioport region are not mapped in
vfio/kernel so ignore mmaping for ioport.

Signed-off-by: Santosh Shukla <sshukla@mvista.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
v7-->v8:
- included Anatoly acked-by:

 lib/librte_eal/linuxapp/eal/eal_pci_vfio.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
index ffa2dd0..4832313 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
@@ -659,6 +659,7 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
 	struct pci_map *maps;
 	uint32_t msix_table_offset = 0;
 	uint32_t msix_table_size = 0;
+	uint32_t ioport_bar;
 
 	dev->intr_handle.fd = -1;
 	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
@@ -853,6 +854,25 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
 			return -1;
 		}
 
+		/* chk for io port region */
+		ret = pread64(vfio_dev_fd, &ioport_bar, sizeof(ioport_bar),
+			      VFIO_GET_REGION_ADDR(VFIO_PCI_CONFIG_REGION_INDEX)
+			      + PCI_BASE_ADDRESS_0 + i*4);
+
+		if (ret != sizeof(ioport_bar)) {
+			RTE_LOG(ERR, EAL,
+				"Cannot read command (%x) from config space!\n",
+				PCI_BASE_ADDRESS_0 + i*4);
+			return -1;
+		}
+
+		if (ioport_bar & PCI_BASE_ADDRESS_SPACE_IO) {
+			RTE_LOG(INFO, EAL,
+				"Ignore mapping IO port bar(%d) addr: %x\n",
+				 i, ioport_bar);
+			continue;
+		}
+
 		/* skip non-mmapable BARs */
 		if ((reg.flags & VFIO_REGION_INFO_FLAG_MMAP) == 0)
 			continue;
-- 
1.7.9.5