1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
new file mode 100644
index 000000000..5c58c22e0
--- /dev/null
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCI Express Hot Plug Controller Driver
+ *
+ * Copyright (C) 1995,2001 Compaq Computer Corporation
+ * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2001 IBM Corp.
+ * Copyright (C) 2003-2004 Intel Corporation
+ *
+ * All rights reserved.
+ *
+ * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include "../pci.h"
+#include "pciehp.h"
+
+int pciehp_configure_device(struct slot *p_slot)
+{
+	struct pci_dev *dev;
+	struct pci_dev *bridge = p_slot->ctrl->pcie->port;
+	struct pci_bus *parent = bridge->subordinate;
+	int num, ret = 0;
+	struct controller *ctrl = p_slot->ctrl;
+
+	pci_lock_rescan_remove();
+
+	dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
+	if (dev) {
+		/*
+		 * The device is already there. Either configured by the
+		 * boot firmware or a previous hotplug event.
+		 */
+		ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
+			 pci_name(dev), pci_domain_nr(parent), parent->number);
+		pci_dev_put(dev);
+		ret = -EEXIST;
+		goto out;
+	}
+
+	num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
+	if (num == 0) {
+		ctrl_err(ctrl, "No new device found\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	for_each_pci_bridge(dev, parent)
+		pci_hp_add_bridge(dev);
+
+	pci_assign_unassigned_bridge_resources(bridge);
+	pcie_bus_configure_settings(parent);
+	pci_bus_add_devices(parent);
+
+ out:
+	pci_unlock_rescan_remove();
+	return ret;
+}
+
+void pciehp_unconfigure_device(struct slot *p_slot)
+{
+	u8 presence = 0;
+	struct pci_dev *dev, *temp;
+	struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
+	u16 command;
+	struct controller *ctrl = p_slot->ctrl;
+
+	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
+		 __func__, pci_domain_nr(parent), parent->number);
+	pciehp_get_adapter_status(p_slot, &presence);
+
+	pci_lock_rescan_remove();
+
+	/*
+	 * Stopping an SR-IOV PF device removes all the associated VFs,
+	 * which will update the bus->devices list and confuse the
+	 * iterator.  Therefore, iterate in reverse so we remove the VFs
+	 * first, then the PF.  We do the same in pci_stop_bus_device().
+	 */
+	list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
+					 bus_list) {
+		pci_dev_get(dev);
+		if (!presence) {
+			pci_dev_set_disconnected(dev, NULL);
+			if (pci_has_subordinate(dev))
+				pci_walk_bus(dev->subordinate,
+					     pci_dev_set_disconnected, NULL);
+		}
+		pci_stop_and_remove_bus_device(dev);
+		/*
+		 * Ensure that no new Requests will be generated from
+		 * the device.
+		 */
+		if (presence) {
+			pci_read_config_word(dev, PCI_COMMAND, &command);
+			command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
+			command |= PCI_COMMAND_INTX_DISABLE;
+			pci_write_config_word(dev, PCI_COMMAND, command);
+		}
+		pci_dev_put(dev);
+	}
+
+	pci_unlock_rescan_remove();
+}