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67086e32b5
PFs are enumerated on PCI bus, while VFs are created by PF's driver. In EEH recovery, it has two cases: 1. Device and driver is EEH aware, error handlers are called. 2. Device and driver is not EEH aware, un-plug the device and plug it again by enumerating it. The special thing happens on the second case. For a PF, we could use the original pci core to enumerate the bus, while for VF we need to record the VFs which aer un-plugged then plug it again. Also The patch caches the VF index in pci_dn, which can be used to calculate VF's bus, device and function number. Those information helps to locate the VF's PCI device instance when doing hotplug during EEH recovery if necessary. Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com> Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* The file intends to implement dynamic creation of EEH device, which will
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* be bound with OF node and PCI device simutaneously. The EEH devices would
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* be foundamental information for EEH core components to work proerly. Besides,
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* We have to support multiple situations where dynamic creation of EEH device
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* is required:
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*
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* 1) Before PCI emunation starts, we need create EEH devices according to the
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* PCI sensitive OF nodes.
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* 2) When PCI emunation is done, we need do the binding between PCI device and
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* the associated EEH device.
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* 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device
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* will be created while PCI sensitive OF node is detected from DR.
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* 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If
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* PHB is newly inserted, we also need create EEH devices accordingly.
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*
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* Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/export.h>
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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/**
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* eeh_dev_init - Create EEH device according to OF node
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* @pdn: PCI device node
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* @data: PHB
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*
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* It will create EEH device according to the given OF node. The function
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* might be called by PCI emunation, DR, PHB hotplug.
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*/
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void *eeh_dev_init(struct pci_dn *pdn, void *data)
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{
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struct pci_controller *phb = data;
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struct eeh_dev *edev;
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/* Allocate EEH device */
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edev = kzalloc(sizeof(*edev), GFP_KERNEL);
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if (!edev) {
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pr_warn("%s: out of memory\n",
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__func__);
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return NULL;
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}
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/* Associate EEH device with OF node */
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pdn->edev = edev;
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edev->pdn = pdn;
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edev->phb = phb;
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INIT_LIST_HEAD(&edev->list);
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INIT_LIST_HEAD(&edev->rmv_list);
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return NULL;
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}
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/**
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* eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
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* @phb: PHB
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*
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* Scan the PHB OF node and its child association, then create the
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* EEH devices accordingly
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*/
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void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
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{
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struct pci_dn *root = phb->pci_data;
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/* EEH PE for PHB */
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eeh_phb_pe_create(phb);
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/* EEH device for PHB */
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eeh_dev_init(root, phb);
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/* EEH devices for children OF nodes */
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traverse_pci_dn(root, eeh_dev_init, phb);
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}
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/**
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* eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
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*
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* Scan all the existing PHBs and create EEH devices for their OF
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* nodes and their children OF nodes
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*/
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static int __init eeh_dev_phb_init(void)
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{
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struct pci_controller *phb, *tmp;
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list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
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eeh_dev_phb_init_dynamic(phb);
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pr_info("EEH: devices created\n");
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return 0;
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}
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core_initcall(eeh_dev_phb_init);
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