diff options
Diffstat (limited to 'kernel/arch/powerpc/kernel/eeh_dev.c')
-rw-r--r-- | kernel/arch/powerpc/kernel/eeh_dev.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/kernel/eeh_dev.c b/kernel/arch/powerpc/kernel/eeh_dev.c new file mode 100644 index 000000000..aabba94ff --- /dev/null +++ b/kernel/arch/powerpc/kernel/eeh_dev.c @@ -0,0 +1,113 @@ +/* + * The file intends to implement dynamic creation of EEH device, which will + * be bound with OF node and PCI device simutaneously. The EEH devices would + * be foundamental information for EEH core components to work proerly. Besides, + * We have to support multiple situations where dynamic creation of EEH device + * is required: + * + * 1) Before PCI emunation starts, we need create EEH devices according to the + * PCI sensitive OF nodes. + * 2) When PCI emunation is done, we need do the binding between PCI device and + * the associated EEH device. + * 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device + * will be created while PCI sensitive OF node is detected from DR. + * 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If + * PHB is newly inserted, we also need create EEH devices accordingly. + * + * 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> + +/** + * eeh_dev_init - Create EEH device according to OF node + * @pdn: PCI device node + * @data: PHB + * + * It will create EEH device according to the given OF node. The function + * might be called by PCI emunation, DR, PHB hotplug. + */ +void *eeh_dev_init(struct pci_dn *pdn, void *data) +{ + struct pci_controller *phb = data; + struct eeh_dev *edev; + + /* Allocate EEH device */ + edev = kzalloc(sizeof(*edev), GFP_KERNEL); + if (!edev) { + pr_warn("%s: out of memory\n", + __func__); + return NULL; + } + + /* Associate EEH device with OF node */ + pdn->edev = edev; + edev->pdn = pdn; + edev->phb = phb; + INIT_LIST_HEAD(&edev->list); + + return NULL; +} + +/** + * eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB + * @phb: PHB + * + * Scan the PHB OF node and its child association, then create the + * EEH devices accordingly + */ +void eeh_dev_phb_init_dynamic(struct pci_controller *phb) +{ + struct pci_dn *root = phb->pci_data; + + /* EEH PE for PHB */ + eeh_phb_pe_create(phb); + + /* EEH device for PHB */ + eeh_dev_init(root, phb); + + /* EEH devices for children OF nodes */ + traverse_pci_dn(root, eeh_dev_init, phb); +} + +/** + * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs + * + * Scan all the existing PHBs and create EEH devices for their OF + * nodes and their children OF nodes + */ +static int __init eeh_dev_phb_init(void) +{ + struct pci_controller *phb, *tmp; + + list_for_each_entry_safe(phb, tmp, &hose_list, list_node) + eeh_dev_phb_init_dynamic(phb); + + pr_info("EEH: devices created\n"); + + return 0; +} + +core_initcall(eeh_dev_phb_init); |