// SPDX-License-Identifier: GPL-2.0-or-later /* * 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. */ #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 * * It will create EEH device according to the given OF node. The function * might be called by PCI emunation, DR, PHB hotplug. */ struct eeh_dev *eeh_dev_init(struct pci_dn *pdn) { struct eeh_dev *edev; /* Allocate EEH device */ edev = kzalloc(sizeof(*edev), GFP_KERNEL); if (!edev) return NULL; /* Associate EEH device with OF node */ pdn->edev = edev; edev->pdn = pdn; edev->bdfn = (pdn->busno << 8) | pdn->devfn; edev->controller = pdn->phb; return edev; } /** * 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) { /* EEH PE for PHB */ eeh_phb_pe_create(phb); }