[PATCH v3] bus/pci: fix legacy device IO port map in secondary process

[Wenwu Ma]

When doing IO port mapping for legacy device
in secondary process, the region information
is missing, so, we need to refill it.

Fixes: 4b741542ecde ("bus/pci: avoid depending on private kernel value")
Cc: sta...@dpdk.org

Signed-off-by: Wenwu Ma <wenwux...@intel.com>
---
v3:
 - adjusting variable settings
v2:
 - add release of device in pci_vfio_ioport_unmap

---
 drivers/bus/pci/linux/pci_vfio.c | 43 ++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index e634de8322..5ef26c98d1 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -1314,6 +1314,27 @@ pci_vfio_ioport_map(struct rte_pci_device *dev, int bar,
                return -1;
        }
 
+       if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
+               struct vfio_device_info device_info = { .argsz = 
sizeof(device_info) };
+               char pci_addr[PATH_MAX];
+               int vfio_dev_fd;
+               struct rte_pci_addr *loc = &dev->addr;
+               int ret;
+               /* store PCI address string */
+               snprintf(pci_addr, sizeof(pci_addr), PCI_PRI_FMT,
+                               loc->domain, loc->bus, loc->devid, 
loc->function);
+
+               ret = rte_vfio_setup_device(rte_pci_get_sysfs_path(), pci_addr,
+                                               &vfio_dev_fd, &device_info);
+               if (ret)
+                       return -1;
+
+               ret = pci_vfio_fill_regions(dev, vfio_dev_fd, &device_info);
+               if (ret)
+                       return -1;
+
+       }
+
        if (pci_vfio_get_region(dev, bar, &size, &offset) != 0) {
                RTE_LOG(ERR, EAL, "Cannot get offset of region %d.\n", bar);
                return -1;
@@ -1361,8 +1382,26 @@ pci_vfio_ioport_write(struct rte_pci_ioport *p,
 int
 pci_vfio_ioport_unmap(struct rte_pci_ioport *p)
 {
-       RTE_SET_USED(p);
-       return -1;
+       char pci_addr[PATH_MAX] = {0};
+       struct rte_pci_addr *loc = &p->dev->addr;
+       int ret, vfio_dev_fd;
+
+       /* store PCI address string */
+       snprintf(pci_addr, sizeof(pci_addr), PCI_PRI_FMT,
+                       loc->domain, loc->bus, loc->devid, loc->function);
+
+       vfio_dev_fd = rte_intr_dev_fd_get(p->dev->intr_handle);
+       if (vfio_dev_fd < 0)
+               return -1;
+
+       ret = rte_vfio_release_device(rte_pci_get_sysfs_path(), pci_addr,
+                                     vfio_dev_fd);
+       if (ret < 0) {
+               RTE_LOG(ERR, EAL, "Cannot release VFIO device\n");
+               return ret;
+       }
+
+       return 0;
 }
 
 int
-- 
2.25.1