diff options
Diffstat (limited to 'kernel/drivers/pci/hotplug/shpchp_pci.c')
| -rw-r--r-- | kernel/drivers/pci/hotplug/shpchp_pci.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/kernel/drivers/pci/hotplug/shpchp_pci.c b/kernel/drivers/pci/hotplug/shpchp_pci.c new file mode 100644 index 000000000..f8cd3a27e --- /dev/null +++ b/kernel/drivers/pci/hotplug/shpchp_pci.c @@ -0,0 +1,116 @@ +/* + * Standard 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. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * 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 "shpchp.h" + +int shpchp_configure_device(struct slot *p_slot) +{ + struct pci_dev *dev; + struct controller *ctrl = p_slot->ctrl; + struct pci_dev *bridge = ctrl->pci_dev; + struct pci_bus *parent = bridge->subordinate; + int num, ret = 0; + + pci_lock_rescan_remove(); + + dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); + if (dev) { + ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n", + pci_name(dev), pci_domain_nr(parent), + p_slot->bus, p_slot->device); + pci_dev_put(dev); + ret = -EINVAL; + goto out; + } + + num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); + if (num == 0) { + ctrl_err(ctrl, "No new device found\n"); + ret = -ENODEV; + goto out; + } + + list_for_each_entry(dev, &parent->devices, bus_list) { + if (PCI_SLOT(dev->devfn) != p_slot->device) + continue; + if (pci_is_bridge(dev)) + 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; +} + +int shpchp_unconfigure_device(struct slot *p_slot) +{ + int rc = 0; + u8 bctl = 0; + struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; + struct pci_dev *dev, *temp; + struct controller *ctrl = p_slot->ctrl; + + ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", + __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); + + pci_lock_rescan_remove(); + + list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) { + if (PCI_SLOT(dev->devfn) != p_slot->device) + continue; + + pci_dev_get(dev); + if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { + pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl); + if (bctl & PCI_BRIDGE_CTL_VGA) { + ctrl_err(ctrl, + "Cannot remove display device %s\n", + pci_name(dev)); + pci_dev_put(dev); + rc = -EINVAL; + break; + } + } + pci_stop_and_remove_bus_device(dev); + pci_dev_put(dev); + } + + pci_unlock_rescan_remove(); + return rc; +} + |