pciehp_pci.c 2.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * PCI Express 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. #include <linux/module.h>
  16. #include <linux/kernel.h>
  17. #include <linux/types.h>
  18. #include <linux/pci.h>
  19. #include "../pci.h"
  20. #include "pciehp.h"
  21. int pciehp_configure_device(struct slot *p_slot)
  22. {
  23. struct pci_dev *dev;
  24. struct pci_dev *bridge = p_slot->ctrl->pcie->port;
  25. struct pci_bus *parent = bridge->subordinate;
  26. int num, ret = 0;
  27. struct controller *ctrl = p_slot->ctrl;
  28. pci_lock_rescan_remove();
  29. dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
  30. if (dev) {
  31. /*
  32. * The device is already there. Either configured by the
  33. * boot firmware or a previous hotplug event.
  34. */
  35. ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
  36. pci_name(dev), pci_domain_nr(parent), parent->number);
  37. pci_dev_put(dev);
  38. ret = -EEXIST;
  39. goto out;
  40. }
  41. num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
  42. if (num == 0) {
  43. ctrl_err(ctrl, "No new device found\n");
  44. ret = -ENODEV;
  45. goto out;
  46. }
  47. for_each_pci_bridge(dev, parent)
  48. pci_hp_add_bridge(dev);
  49. pci_assign_unassigned_bridge_resources(bridge);
  50. pcie_bus_configure_settings(parent);
  51. pci_bus_add_devices(parent);
  52. out:
  53. pci_unlock_rescan_remove();
  54. return ret;
  55. }
  56. void pciehp_unconfigure_device(struct slot *p_slot)
  57. {
  58. u8 presence = 0;
  59. struct pci_dev *dev, *temp;
  60. struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
  61. u16 command;
  62. struct controller *ctrl = p_slot->ctrl;
  63. ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
  64. __func__, pci_domain_nr(parent), parent->number);
  65. pciehp_get_adapter_status(p_slot, &presence);
  66. pci_lock_rescan_remove();
  67. /*
  68. * Stopping an SR-IOV PF device removes all the associated VFs,
  69. * which will update the bus->devices list and confuse the
  70. * iterator. Therefore, iterate in reverse so we remove the VFs
  71. * first, then the PF. We do the same in pci_stop_bus_device().
  72. */
  73. list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
  74. bus_list) {
  75. pci_dev_get(dev);
  76. if (!presence) {
  77. pci_dev_set_disconnected(dev, NULL);
  78. if (pci_has_subordinate(dev))
  79. pci_walk_bus(dev->subordinate,
  80. pci_dev_set_disconnected, NULL);
  81. }
  82. pci_stop_and_remove_bus_device(dev);
  83. /*
  84. * Ensure that no new Requests will be generated from
  85. * the device.
  86. */
  87. if (presence) {
  88. pci_read_config_word(dev, PCI_COMMAND, &command);
  89. command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
  90. command |= PCI_COMMAND_INTX_DISABLE;
  91. pci_write_config_word(dev, PCI_COMMAND, command);
  92. }
  93. pci_dev_put(dev);
  94. }
  95. pci_unlock_rescan_remove();
  96. }