| /* |
| * The file intends to implement PE based on the information from |
| * platforms. Basically, there have 3 types of PEs: PHB/Bus/Device. |
| * All the PEs should be organized as hierarchy tree. The first level |
| * of the tree will be associated to existing PHBs since the particular |
| * PE is only meaningful in one PHB domain. |
| * |
| * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012. |
| * |
| * 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. 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/gfp.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/string.h> |
| |
| #include <asm/pci-bridge.h> |
| #include <asm/ppc-pci.h> |
| |
| static LIST_HEAD(eeh_phb_pe); |
| |
| /** |
| * eeh_pe_alloc - Allocate PE |
| * @phb: PCI controller |
| * @type: PE type |
| * |
| * Allocate PE instance dynamically. |
| */ |
| static struct eeh_pe *eeh_pe_alloc(struct pci_controller *phb, int type) |
| { |
| struct eeh_pe *pe; |
| |
| /* Allocate PHB PE */ |
| pe = kzalloc(sizeof(struct eeh_pe), GFP_KERNEL); |
| if (!pe) return NULL; |
| |
| /* Initialize PHB PE */ |
| pe->type = type; |
| pe->phb = phb; |
| INIT_LIST_HEAD(&pe->child_list); |
| INIT_LIST_HEAD(&pe->child); |
| INIT_LIST_HEAD(&pe->edevs); |
| |
| return pe; |
| } |
| |
| /** |
| * eeh_phb_pe_create - Create PHB PE |
| * @phb: PCI controller |
| * |
| * The function should be called while the PHB is detected during |
| * system boot or PCI hotplug in order to create PHB PE. |
| */ |
| int __devinit eeh_phb_pe_create(struct pci_controller *phb) |
| { |
| struct eeh_pe *pe; |
| |
| /* Allocate PHB PE */ |
| pe = eeh_pe_alloc(phb, EEH_PE_PHB); |
| if (!pe) { |
| pr_err("%s: out of memory!\n", __func__); |
| return -ENOMEM; |
| } |
| |
| /* Put it into the list */ |
| eeh_lock(); |
| list_add_tail(&pe->child, &eeh_phb_pe); |
| eeh_unlock(); |
| |
| pr_debug("EEH: Add PE for PHB#%d\n", phb->global_number); |
| |
| return 0; |
| } |
| |
| /** |
| * eeh_phb_pe_get - Retrieve PHB PE based on the given PHB |
| * @phb: PCI controller |
| * |
| * The overall PEs form hierarchy tree. The first layer of the |
| * hierarchy tree is composed of PHB PEs. The function is used |
| * to retrieve the corresponding PHB PE according to the given PHB. |
| */ |
| static struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb) |
| { |
| struct eeh_pe *pe; |
| |
| eeh_lock(); |
| |
| list_for_each_entry(pe, &eeh_phb_pe, child) { |
| /* |
| * Actually, we needn't check the type since |
| * the PE for PHB has been determined when that |
| * was created. |
| */ |
| if (pe->type == EEH_PE_PHB && |
| pe->phb == phb) { |
| eeh_unlock(); |
| return pe; |
| } |
| } |
| |
| eeh_unlock(); |
| |
| return NULL; |
| } |