mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 11:56:50 +07:00
ba518e3c17
Currently, we enumerate devices in a slot with pci_scan_slot(), then iterate through all the devices we found by looking for functions 0-7. But that's wrong for ARI devices, which may have function numbers up to 255. This means that when we hot-add an ARI device, pciehp only initializes functions 0-7, and other functions don't work correctly. Additionally, if we hot-remove the device, pciehp only removes functions 0-7, leaving stale pci_dev structures for any other functions. This patch fixes the problem by iterating over devices in a slot by using the upstream bridge's "bus->devices" list instead. [bhelgaas: changelog] Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/*
|
|
* 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;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
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);
|
|
return -EINVAL;
|
|
}
|
|
|
|
num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
|
|
if (num == 0) {
|
|
ctrl_err(ctrl, "No new device found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
list_for_each_entry(dev, &parent->devices, bus_list)
|
|
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
|
|
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
|
|
pci_hp_add_bridge(dev);
|
|
|
|
pci_assign_unassigned_bridge_resources(bridge);
|
|
|
|
list_for_each_entry(dev, &parent->devices, bus_list) {
|
|
if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
|
|
continue;
|
|
|
|
pci_configure_slot(dev);
|
|
}
|
|
|
|
pci_bus_add_devices(parent);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pciehp_unconfigure_device(struct slot *p_slot)
|
|
{
|
|
int ret, 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);
|
|
ret = pciehp_get_adapter_status(p_slot, &presence);
|
|
if (ret)
|
|
presence = 0;
|
|
|
|
list_for_each_entry_safe(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);
|
|
}
|
|
|
|
return rc;
|
|
}
|