1 // SPDX-License-Identifier: GPL-2.0+
6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
8  * Copyright (C) 2003-2004 Intel Corporation
25  * pciehp_configure_device() - enumerate PCI devices below a hotplug bridge
26  * @ctrl: PCIe hotplug controller
29  * Return 0 on success, %-EEXIST if the devices are already enumerated or
30  * %-ENODEV if enumeration failed.
32 int pciehp_configure_device(struct controller *ctrl)  in pciehp_configure_device()  argument
34 	struct pci_dev *dev;  in pciehp_configure_device()  local
35 	struct pci_dev *bridge = ctrl->pcie->port;  in pciehp_configure_device()
36 	struct pci_bus *parent = bridge->subordinate;  in pciehp_configure_device()
41 	dev = pci_get_slot(parent, PCI_DEVFN(0, 0));  in pciehp_configure_device()
42 	if (dev) {  in pciehp_configure_device()
47 		ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",  in pciehp_configure_device()
48 			 pci_name(dev), pci_domain_nr(parent), parent->number);  in pciehp_configure_device()
49 		pci_dev_put(dev);  in pciehp_configure_device()
50 		ret = -EEXIST;  in pciehp_configure_device()
56 		ctrl_err(ctrl, "No new device found\n");  in pciehp_configure_device()
57 		ret = -ENODEV;  in pciehp_configure_device()
61 	for_each_pci_bridge(dev, parent)  in pciehp_configure_device()
62 		pci_hp_add_bridge(dev);  in pciehp_configure_device()
69 	 * to avoid AB-BA deadlock with device_lock.  in pciehp_configure_device()
71 	up_read(&ctrl->reset_lock);  in pciehp_configure_device()
73 	down_read_nested(&ctrl->reset_lock, ctrl->depth);  in pciehp_configure_device()
75 	dev = pci_get_slot(parent, PCI_DEVFN(0, 0));  in pciehp_configure_device()
76 	ctrl->dsn = pci_get_dsn(dev);  in pciehp_configure_device()
77 	pci_dev_put(dev);  in pciehp_configure_device()
85  * pciehp_unconfigure_device() - remove PCI devices below a hotplug bridge
86  * @ctrl: PCIe hotplug controller
95 void pciehp_unconfigure_device(struct controller *ctrl, bool presence)  in pciehp_unconfigure_device()  argument
97 	struct pci_dev *dev, *temp;  in pciehp_unconfigure_device()  local
98 	struct pci_bus *parent = ctrl->pcie->port->subordinate;  in pciehp_unconfigure_device()
101 	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",  in pciehp_unconfigure_device()
102 		 __func__, pci_domain_nr(parent), parent->number);  in pciehp_unconfigure_device()
110 	 * Stopping an SR-IOV PF device removes all the associated VFs,  in pciehp_unconfigure_device()
111 	 * which will update the bus->devices list and confuse the  in pciehp_unconfigure_device()
115 	list_for_each_entry_safe_reverse(dev, temp, &parent->devices,  in pciehp_unconfigure_device()
117 		pci_dev_get(dev);  in pciehp_unconfigure_device()
121 		 * to avoid AB-BA deadlock with device_lock.  in pciehp_unconfigure_device()
123 		up_read(&ctrl->reset_lock);  in pciehp_unconfigure_device()
124 		pci_stop_and_remove_bus_device(dev);  in pciehp_unconfigure_device()
125 		down_read_nested(&ctrl->reset_lock, ctrl->depth);  in pciehp_unconfigure_device()
132 			pci_read_config_word(dev, PCI_COMMAND, &command);  in pciehp_unconfigure_device()
135 			pci_write_config_word(dev, PCI_COMMAND, command);  in pciehp_unconfigure_device()
137 		pci_dev_put(dev);  in pciehp_unconfigure_device()