pci: unmap igb_uio resources

The patch adds functions for unmapping igb_uio resources. The patch is only
for Linux and igb_uio environment. VFIO and BSD are not supported.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>

config/common_bsdapp

@@ -115,6 +115,12 @@ CONFIG_RTE_LIBRTE_EAL_BSDAPP=y
 #
 CONFIG_RTE_LIBRTE_EAL_LINUXAPP=n
 
+#
+# Compile Environment Abstraction Layer to support hotplug
+# So far, Hotplug functions only support linux
+#
+CONFIG_RTE_LIBRTE_EAL_HOTPLUG=n
+
 #
 # Compile Environment Abstraction Layer to support Vmware TSC map
 #

config/common_linuxapp

@@ -113,6 +113,11 @@ CONFIG_RTE_PCI_MAX_READ_REQUEST_SIZE=0
 #
 CONFIG_RTE_LIBRTE_EAL_LINUXAPP=y
 
+#
+# Compile Environment Abstraction Layer to support hotplug
+#
+CONFIG_RTE_LIBRTE_EAL_HOTPLUG=y
+
 #
 # Compile Environment Abstraction Layer to support Vmware TSC map
 #

lib/librte_eal/linuxapp/eal/eal_pci.c

@@ -168,6 +168,23 @@ pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size,
 	return mapaddr;
 }
 
+/* unmap a particular resource */
+void
+pci_unmap_resource(void *requested_addr, size_t size)
+{
+	if (requested_addr == NULL)
+		return;
+
+	/* Unmap the PCI memory resource of device */
+	if (munmap(requested_addr, size)) {
+		RTE_LOG(ERR, EAL, "%s(): cannot munmap(%p, 0x%lx): %s\n",
+			__func__, requested_addr, (unsigned long)size,
+			strerror(errno));
+	} else
+		RTE_LOG(DEBUG, EAL, "  PCI memory unmapped at %p\n",
+				requested_addr);
+}
+
 /* parse the "resource" sysfs file */
 static int
 pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)

lib/librte_eal/linuxapp/eal/eal_pci_init.h

@@ -72,6 +72,13 @@ void *pci_map_resource(void *requested_addr, int fd, off_t offset,
 /* map IGB_UIO resource prototype */
 int pci_uio_map_resource(struct rte_pci_device *dev);
 
+void pci_unmap_resource(void *requested_addr, size_t size);
+
+#ifdef RTE_LIBRTE_EAL_HOTPLUG
+/* unmap IGB_UIO resource prototype */
+void pci_uio_unmap_resource(struct rte_pci_device *dev);
+#endif /* RTE_LIBRTE_EAL_HOTPLUG */
+
 #ifdef VFIO_PRESENT
 
 #define VFIO_MAX_GROUPS 64

lib/librte_eal/linuxapp/eal/eal_pci_uio.c

@@ -386,3 +386,68 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 
 	return 0;
 }
+
+#ifdef RTE_LIBRTE_EAL_HOTPLUG
+static void
+pci_uio_unmap(struct mapped_pci_resource *uio_res)
+{
+	int i;
+
+	if (uio_res == NULL)
+		return;
+
+	for (i = 0; i != uio_res->nb_maps; i++)
+		pci_unmap_resource(uio_res->maps[i].addr,
+				(size_t)uio_res->maps[i].size);
+}
+
+static struct mapped_pci_resource *
+pci_uio_find_resource(struct rte_pci_device *dev)
+{
+	struct mapped_pci_resource *uio_res;
+
+	if (dev == NULL)
+		return NULL;
+
+	TAILQ_FOREACH(uio_res, pci_res_list, next) {
+
+		/* skip this element if it doesn't match our PCI address */
+		if (!rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
+			return uio_res;
+	}
+	return NULL;
+}
+
+/* unmap the PCI resource of a PCI device in virtual memory */
+void
+pci_uio_unmap_resource(struct rte_pci_device *dev)
+{
+	struct mapped_pci_resource *uio_res;
+
+	if (dev == NULL)
+		return;
+
+	/* find an entry for the device */
+	uio_res = pci_uio_find_resource(dev);
+	if (uio_res == NULL)
+		return;
+
+	/* secondary processes - just free maps */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return pci_uio_unmap(uio_res);
+
+	TAILQ_REMOVE(pci_res_list, uio_res, next);
+
+	/* unmap all resources */
+	pci_uio_unmap(uio_res);
+
+	/* free uio resource */
+	rte_free(uio_res);
+
+	/* close fd if in primary process */
+	close(dev->intr_handle.fd);
+
+	dev->intr_handle.fd = -1;
+	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+}
+#endif /* RTE_LIBRTE_EAL_HOTPLUG */