drivers/pci/hotplug/shpchp_pci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Standard Hot Plug Controller Driver
   4  *
   5  * Copyright (C) 1995,2001 Compaq Computer Corporation
   6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   7  * Copyright (C) 2001 IBM Corp.
   8  * Copyright (C) 2003-2004 Intel Corporation
   9  *
  10  * All rights reserved.
  11  *
  12  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/pci.h>
  20 #include "../pci.h"
  21 #include "shpchp.h"
  22
  23 int shpchp_configure_device(struct slot *p_slot)
  24 {
  25         struct pci_dev *dev;
  26         struct controller *ctrl = p_slot->ctrl;
  27         struct pci_dev *bridge = ctrl->pci_dev;
  28         struct pci_bus *parent = bridge->subordinate;
  29         int num, ret = 0;
  30
  31         pci_lock_rescan_remove();
  32
  33         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
  34         if (dev) {
  35                 ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n",
  36                          pci_name(dev), pci_domain_nr(parent),
  37                          p_slot->bus, p_slot->device);
  38                 pci_dev_put(dev);
  39                 ret = -EINVAL;
  40                 goto out;
  41         }
  42
  43         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
  44         if (num == 0) {
  45                 ctrl_err(ctrl, "No new device found\n");
  46                 ret = -ENODEV;
  47                 goto out;
  48         }
  49
  50         for_each_pci_bridge(dev, parent) {
  51                 if (PCI_SLOT(dev->devfn) == p_slot->device)
  52                         pci_hp_add_bridge(dev);
  53         }
  54
  55         pci_assign_unassigned_bridge_resources(bridge);
  56         pcie_bus_configure_settings(parent);
  57         pci_bus_add_devices(parent);
  58
  59  out:
  60         pci_unlock_rescan_remove();
  61         return ret;
  62 }
  63
  64 int shpchp_unconfigure_device(struct slot *p_slot)
  65 {
  66         int rc = 0;
  67         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
  68         struct pci_dev *dev, *temp;
  69         struct controller *ctrl = p_slot->ctrl;
  70
  71         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
  72                  __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
  73
  74         pci_lock_rescan_remove();
  75
  76         list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
  77                 if (PCI_SLOT(dev->devfn) != p_slot->device)
  78                         continue;
  79
  80                 pci_dev_get(dev);
  81                 pci_stop_and_remove_bus_device(dev);
  82                 pci_dev_put(dev);
  83         }
  84
  85         pci_unlock_rescan_remove();
  86         return rc;
  87 }
  88