rte_eal_pci_scan can be called repeatedly to re-scan the PCI
bus. If a device was removed from the system, the associated
driver will automatically be unloaded.
Signed-off-by: Ben Walker <benjamin.walker at intel.com>
---
lib/librte_eal/linuxapp/eal/eal_pci.c | 62 +++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c
b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 073af5f..936f076 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -485,7 +485,69 @@ rte_eal_pci_scan(void)
DIR *dir;
char dirname[PATH_MAX];
struct rte_pci_addr addr;
+ struct rte_pci_device *dev, *tmp;
+
+ /* Search the device list for devices that are no longer present on the
system
+ * and remove them.
+ */
+ TAILQ_FOREACH_SAFE(dev, &pci_device_list, next, tmp) {
+ int found = 0;
+
+ dir = opendir(pci_get_sysfs_path());
+ if (dir == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
+ __func__, strerror(errno));
+ return -1;
+ }
+
+ while ((e = readdir(dir)) != NULL) {
+ if (e->d_name[0] == '.')
+ continue;
+
+ if (parse_pci_addr_format(e->d_name, sizeof(e->d_name),
+ &addr) != 0)
+ continue;
+
+ if (rte_eal_compare_pci_addr(&addr, &dev->addr) == 0) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+
+ RTE_LOG(DEBUG, EAL, "PCI device "PCI_PRI_FMT" was
removed.\n",
+ addr.domain, addr.bus, addr.devid,
+ addr.function);
+
+ if (dev->driver) {
+ /* A driver was loaded against this device.
+ * Unload it. */
+ RTE_LOG(DEBUG, EAL, " Unload driver: %x:%x
%s\n",
+ dev->id.vendor_id,
dev->id.device_id,
+ dev->driver->driver.name);
+
+ if (dev->driver->remove) {
+ /* It doesn't matter what remove
returns -
+ * we're removing the device either
way. */
+ dev->driver->remove(dev);
+ }
+
+ /* clear driver structure */
+ dev->driver = NULL;
+
+ if (dev->driver->drv_flags &
RTE_PCI_DRV_NEED_MAPPING)
+ rte_eal_pci_unmap_device(dev);
+ }
+
+ TAILQ_REMOVE(&pci_device_list, dev, next);
+ free(dev);
+ }
+
+ closedir(dir);
+ }
+ /* Search sysfs for all PCI devices and add them to the device list */
dir = opendir(pci_get_sysfs_path());
if (dir == NULL) {
RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
--
2.7.4
