^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * PCI Express Hot Plug Controller Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1995,2001 Compaq Computer Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2001 IBM Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2003-2004 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define dev_fmt(fmt) "pciehp: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "../pci.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "pciehp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * pciehp_configure_device() - enumerate PCI devices below a hotplug bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * @ctrl: PCIe hotplug controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Enumerate PCI devices below a hotplug bridge and add them to the system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Return 0 on success, %-EEXIST if the devices are already enumerated or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * %-ENODEV if enumeration failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int pciehp_configure_device(struct controller *ctrl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct pci_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct pci_dev *bridge = ctrl->pcie->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct pci_bus *parent = bridge->subordinate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int num, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) pci_lock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * The device is already there. Either configured by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * boot firmware or a previous hotplug event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) pci_name(dev), pci_domain_nr(parent), parent->number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pci_dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (num == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ctrl_err(ctrl, "No new device found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) for_each_pci_bridge(dev, parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pci_hp_add_bridge(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) pci_assign_unassigned_bridge_resources(bridge);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) pcie_bus_configure_settings(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) pci_bus_add_devices(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) pci_unlock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * pciehp_unconfigure_device() - remove PCI devices below a hotplug bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * @ctrl: PCIe hotplug controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * @presence: whether the card is still present in the slot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * true for safe removal via sysfs or an Attention Button press,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * false for surprise removal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * Unbind PCI devices below a hotplug bridge from their drivers and remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * them from the system. Safely removed devices are quiesced. Surprise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * removed devices are marked as such to prevent further accesses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) void pciehp_unconfigure_device(struct controller *ctrl, bool presence)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct pci_dev *dev, *temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct pci_bus *parent = ctrl->pcie->port->subordinate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) u16 command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) __func__, pci_domain_nr(parent), parent->number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (!presence)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pci_lock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * Stopping an SR-IOV PF device removes all the associated VFs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * which will update the bus->devices list and confuse the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * iterator. Therefore, iterate in reverse so we remove the VFs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * first, then the PF. We do the same in pci_stop_bus_device().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) bus_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) pci_dev_get(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) pci_stop_and_remove_bus_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * Ensure that no new Requests will be generated from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (presence) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) pci_read_config_word(dev, PCI_COMMAND, &command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) command |= PCI_COMMAND_INTX_DISABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) pci_write_config_word(dev, PCI_COMMAND, command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) pci_dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) pci_unlock_rescan_remove();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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