142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* 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.
|
|
*
|
|
* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
|
|
*
|
|
*/
|
|
|
|
#define dev_fmt(fmt) "pciehp: " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/pci.h>
|
|
#include "../pci.h"
|
|
#include "pciehp.h"
|
|
|
|
/**
|
|
* pciehp_configure_device() - enumerate PCI devices below a hotplug bridge
|
|
* @ctrl: PCIe hotplug controller
|
|
*
|
|
* Enumerate PCI devices below a hotplug bridge and add them to the system.
|
|
* Return 0 on success, %-EEXIST if the devices are already enumerated or
|
|
* %-ENODEV if enumeration failed.
|
|
*/
|
|
int pciehp_configure_device(struct controller *ctrl)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_dev *bridge = ctrl->pcie->port;
|
|
struct pci_bus *parent = bridge->subordinate;
|
|
int num, ret = 0;
|
|
|
|
pci_lock_rescan_remove();
|
|
|
|
dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
|
|
if (dev) {
|
|
/*
|
|
* The device is already there. Either configured by the
|
|
* boot firmware or a previous hotplug event.
|
|
*/
|
|
ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping 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;
|
|
}
|
|
|
|
for_each_pci_bridge(dev, parent)
|
|
pci_hp_add_bridge(dev);
|
|
|
|
pci_assign_unassigned_bridge_resources(bridge);
|
|
pcie_bus_configure_settings(parent);
|
|
|
|
/*
|
|
* Release reset_lock during driver binding
|
|
* to avoid AB-BA deadlock with device_lock.
|
|
*/
|
|
up_read(&ctrl->reset_lock);
|
|
pci_bus_add_devices(parent);
|
|
down_read_nested(&ctrl->reset_lock, ctrl->depth);
|
|
|
|
dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
|
|
ctrl->dsn = pci_get_dsn(dev);
|
|
pci_dev_put(dev);
|
|
|
|
out:
|
|
pci_unlock_rescan_remove();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pciehp_unconfigure_device() - remove PCI devices below a hotplug bridge
|
|
* @ctrl: PCIe hotplug controller
|
|
* @presence: whether the card is still present in the slot;
|
|
* true for safe removal via sysfs or an Attention Button press,
|
|
* false for surprise removal
|
|
*
|
|
* Unbind PCI devices below a hotplug bridge from their drivers and remove
|
|
* them from the system. Safely removed devices are quiesced. Surprise
|
|
* removed devices are marked as such to prevent further accesses.
|
|
*/
|
|
void pciehp_unconfigure_device(struct controller *ctrl, bool presence)
|
|
{
|
|
struct pci_dev *dev, *temp;
|
|
struct pci_bus *parent = ctrl->pcie->port->subordinate;
|
|
u16 command;
|
|
|
|
ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
|
|
__func__, pci_domain_nr(parent), parent->number);
|
|
|
|
if (!presence)
|
|
pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
|
|
|
|
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);
|
|
|
|
/*
|
|
* Release reset_lock during driver unbinding
|
|
* to avoid AB-BA deadlock with device_lock.
|
|
*/
|
|
up_read(&ctrl->reset_lock);
|
|
pci_stop_and_remove_bus_device(dev);
|
|
down_read_nested(&ctrl->reset_lock, ctrl->depth);
|
|
|
|
/*
|
|
* 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();
|
|
}
|