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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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12e13ac84c
Notifier functions are expected to return NOTIFY_* codes, not -E... ones. In particular, since the respective hypercalls failing is not fatal to the operation of the Dom0 kernel, it must be avoided to return negative values here as those would make it appear as if NOTIFY_STOP_MASK wa set, suppressing further notification calls to other interested parties (which is also why we don't want to use notifier_from_errno() here). While at it, also notify the user of a failed hypercall. Signed-off-by: Jan Beulich <jbeulich@novell.com> [v1: Added dev_err and the disable MSI/MSI-X call] [v2: Removed the disable MSI/MSI-X call] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/*
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* Copyright (c) 2009, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Author: Weidong Han <weidong.han@intel.com>
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*/
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#include <linux/pci.h>
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#include <xen/xen.h>
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#include <xen/interface/physdev.h>
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#include <xen/interface/xen.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include "../pci/pci.h"
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static int xen_add_device(struct device *dev)
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{
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int r;
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struct pci_dev *pci_dev = to_pci_dev(dev);
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#ifdef CONFIG_PCI_IOV
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if (pci_dev->is_virtfn) {
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struct physdev_manage_pci_ext manage_pci_ext = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn,
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.is_virtfn = 1,
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.physfn.bus = pci_dev->physfn->bus->number,
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.physfn.devfn = pci_dev->physfn->devfn,
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
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&manage_pci_ext);
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} else
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#endif
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if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
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struct physdev_manage_pci_ext manage_pci_ext = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn,
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.is_extfn = 1,
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
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&manage_pci_ext);
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} else {
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struct physdev_manage_pci manage_pci = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn,
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
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&manage_pci);
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}
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return r;
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}
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static int xen_remove_device(struct device *dev)
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{
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int r;
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct physdev_manage_pci manage_pci;
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manage_pci.bus = pci_dev->bus->number;
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manage_pci.devfn = pci_dev->devfn;
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
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&manage_pci);
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return r;
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}
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static int xen_pci_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct device *dev = data;
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int r = 0;
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switch (action) {
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case BUS_NOTIFY_ADD_DEVICE:
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r = xen_add_device(dev);
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break;
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case BUS_NOTIFY_DEL_DEVICE:
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r = xen_remove_device(dev);
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break;
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default:
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return NOTIFY_DONE;
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}
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if (r)
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dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
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action == BUS_NOTIFY_ADD_DEVICE ? "add" :
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(action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
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return NOTIFY_OK;
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}
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static struct notifier_block device_nb = {
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.notifier_call = xen_pci_notifier,
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};
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static int __init register_xen_pci_notifier(void)
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{
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if (!xen_initial_domain())
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return 0;
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return bus_register_notifier(&pci_bus_type, &device_nb);
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}
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arch_initcall(register_xen_pci_notifier);
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