121 lines
3 KiB
C
121 lines
3 KiB
C
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/*
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* The file intends to implement PE based on the information from
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* platforms. Basically, there have 3 types of PEs: PHB/Bus/Device.
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* All the PEs should be organized as hierarchy tree. The first level
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* of the tree will be associated to existing PHBs since the particular
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* PE is only meaningful in one PHB domain.
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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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static LIST_HEAD(eeh_phb_pe);
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/**
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* eeh_pe_alloc - Allocate PE
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* @phb: PCI controller
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* @type: PE type
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*
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* Allocate PE instance dynamically.
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*/
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static struct eeh_pe *eeh_pe_alloc(struct pci_controller *phb, int type)
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{
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struct eeh_pe *pe;
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/* Allocate PHB PE */
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pe = kzalloc(sizeof(struct eeh_pe), GFP_KERNEL);
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if (!pe) return NULL;
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/* Initialize PHB PE */
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pe->type = type;
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pe->phb = phb;
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INIT_LIST_HEAD(&pe->child_list);
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INIT_LIST_HEAD(&pe->child);
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INIT_LIST_HEAD(&pe->edevs);
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return pe;
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}
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/**
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* eeh_phb_pe_create - Create PHB PE
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* @phb: PCI controller
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*
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* The function should be called while the PHB is detected during
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* system boot or PCI hotplug in order to create PHB PE.
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*/
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int __devinit eeh_phb_pe_create(struct pci_controller *phb)
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{
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struct eeh_pe *pe;
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/* Allocate PHB PE */
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pe = eeh_pe_alloc(phb, EEH_PE_PHB);
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if (!pe) {
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pr_err("%s: out of memory!\n", __func__);
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return -ENOMEM;
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}
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/* Put it into the list */
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eeh_lock();
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list_add_tail(&pe->child, &eeh_phb_pe);
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eeh_unlock();
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pr_debug("EEH: Add PE for PHB#%d\n", phb->global_number);
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return 0;
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}
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/**
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* eeh_phb_pe_get - Retrieve PHB PE based on the given PHB
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* @phb: PCI controller
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*
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* The overall PEs form hierarchy tree. The first layer of the
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* hierarchy tree is composed of PHB PEs. The function is used
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* to retrieve the corresponding PHB PE according to the given PHB.
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*/
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static struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb)
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{
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struct eeh_pe *pe;
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eeh_lock();
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list_for_each_entry(pe, &eeh_phb_pe, child) {
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/*
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* Actually, we needn't check the type since
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* the PE for PHB has been determined when that
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* was created.
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*/
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if (pe->type == EEH_PE_PHB &&
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pe->phb == phb) {
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eeh_unlock();
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return pe;
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}
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}
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eeh_unlock();
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return NULL;
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}
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