arch/powerpc/kernel/eeh_dev.c

   1 /*
   2  * The file intends to implement dynamic creation of EEH device, which will
   3  * be bound with OF node and PCI device simutaneously. The EEH devices would
   4  * be foundamental information for EEH core components to work proerly. Besides,
   5  * We have to support multiple situations where dynamic creation of EEH device
   6  * is required:
   7  *
   8  * 1) Before PCI emunation starts, we need create EEH devices according to the
   9  *    PCI sensitive OF nodes.
  10  * 2) When PCI emunation is done, we need do the binding between PCI device and
  11  *    the associated EEH device.
  12  * 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device
  13  *    will be created while PCI sensitive OF node is detected from DR.
  14  * 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If
  15  *    PHB is newly inserted, we also need create EEH devices accordingly.
  16  *
  17  * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012.
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, write to the Free Software
  31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  32  */
  33
  34 #include <linux/export.h>
  35 #include <linux/gfp.h>
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/pci.h>
  39 #include <linux/string.h>
  40
  41 #include <asm/pci-bridge.h>
  42 #include <asm/ppc-pci.h>
  43
  44 /**
  45  * eeh_dev_init - Create EEH device according to OF node
  46  * @pdn: PCI device node
  47  *
  48  * It will create EEH device according to the given OF node. The function
  49  * might be called by PCI emunation, DR, PHB hotplug.
  50  */
  51 struct eeh_dev *eeh_dev_init(struct pci_dn *pdn)
  52 {
  53         struct pci_controller *phb = pdn->phb;
  54         struct eeh_dev *edev;
  55
  56         /* Allocate EEH device */
  57         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
  58         if (!edev) {
  59                 pr_warn("%s: out of memory\n",
  60                         __func__);
  61                 return NULL;
  62         }
  63
  64         /* Associate EEH device with OF node */
  65         pdn->edev = edev;
  66         edev->pdn = pdn;
  67         edev->phb = phb;
  68         INIT_LIST_HEAD(&edev->list);
  69         INIT_LIST_HEAD(&edev->rmv_list);
  70
  71         return edev;
  72 }
  73
  74 /**
  75  * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
  76  * @phb: PHB
  77  *
  78  * Scan the PHB OF node and its child association, then create the
  79  * EEH devices accordingly
  80  */
  81 void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
  82 {
  83         /* EEH PE for PHB */
  84         eeh_phb_pe_create(phb);
  85 }
  86
  87 /**
  88  * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
  89  *
  90  * Scan all the existing PHBs and create EEH devices for their OF
  91  * nodes and their children OF nodes
  92  */
  93 static int __init eeh_dev_phb_init(void)
  94 {
  95         struct pci_controller *phb, *tmp;
  96
  97         list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
  98                 eeh_dev_phb_init_dynamic(phb);
  99
 100         return 0;
 101 }
 102
 103 core_initcall(eeh_dev_phb_init);