Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pci / hotplug / pciehp_pci.c

diff --git a/kernel/drivers/pci/hotplug/pciehp_pci.c b/kernel/drivers/pci/hotplug/pciehp_pci.c
new file mode 100644 (file)
index 0000000..9e69403
--- /dev/null
+++ b/kernel/drivers/pci/hotplug/pciehp_pci.c
@@ -0,0 +1,128 @@
+/*
+ * 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.
+ *
+ * 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 "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) {
+               ctrl_err(ctrl, "Device %s already exists at %04x:%02x:00, cannot 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;
+       }
+
+       list_for_each_entry(dev, &parent->devices, bus_list)
+               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 pciehp_unconfigure_device(struct slot *p_slot)
+{
+       int rc = 0;
+       u8 bctl = 0;
+       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 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
+                       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);
+               /*
+                * 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();
+       return rc;
+}