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8cc7581cdb
The pdn (struct pci_dn) instances are allocated from memblock or bootmem when creating PCI controller (hoses) in setup_arch(). PCI hotplug, which will be supported by proceeding patches, releases PCI device nodes and their corresponding pdn on unplugging event. The memory chunks for pdn instances allocated from memblock or bootmem are hard to reused after being released. This delays creating pdn by pci_devs_phb_init() from setup_arch() to core_initcall() so that they are allocated from slab. The memory consumed by pdn can be released to system without problem during PCI unplugging time. It indicates that pci_dn is unavailable in setup_arch() and the the fixup on pdn (like AGP's) can't be carried out that time. We have to do that in pcibios_root_bridge_prepare() on maple/pasemi/powermac platforms where/when the pdn is available. pcibios_root_bridge_prepare is called from subsys_initcall() which is executed after core_initcall() so the code flow does not change. At the mean while, the EEH device is created when pdn is populated, meaning pdn and EEH device have same life cycle. In turn, we needn't call eeh_dev_init() to create EEH device explicitly. Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/*
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* The file intends to implement dynamic creation of EEH device, which will
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* be bound with OF node and PCI device simutaneously. The EEH devices would
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* be foundamental information for EEH core components to work proerly. Besides,
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* We have to support multiple situations where dynamic creation of EEH device
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* is required:
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*
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* 1) Before PCI emunation starts, we need create EEH devices according to the
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* PCI sensitive OF nodes.
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* 2) When PCI emunation is done, we need do the binding between PCI device and
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* the associated EEH device.
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* 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device
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* will be created while PCI sensitive OF node is detected from DR.
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* 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If
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* PHB is newly inserted, we also need create EEH devices accordingly.
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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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/**
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* eeh_dev_init - Create EEH device according to OF node
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* @pdn: PCI device node
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*
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* It will create EEH device according to the given OF node. The function
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* might be called by PCI emunation, DR, PHB hotplug.
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*/
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struct eeh_dev *eeh_dev_init(struct pci_dn *pdn)
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{
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struct pci_controller *phb = pdn->phb;
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struct eeh_dev *edev;
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/* Allocate EEH device */
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edev = kzalloc(sizeof(*edev), GFP_KERNEL);
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if (!edev) {
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pr_warn("%s: out of memory\n",
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__func__);
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return NULL;
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}
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/* Associate EEH device with OF node */
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pdn->edev = edev;
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edev->pdn = pdn;
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edev->phb = phb;
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INIT_LIST_HEAD(&edev->list);
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INIT_LIST_HEAD(&edev->rmv_list);
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return edev;
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}
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/**
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* eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
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* @phb: PHB
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*
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* Scan the PHB OF node and its child association, then create the
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* EEH devices accordingly
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*/
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void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
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{
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/* EEH PE for PHB */
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eeh_phb_pe_create(phb);
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}
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/**
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* eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
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*
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* Scan all the existing PHBs and create EEH devices for their OF
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* nodes and their children OF nodes
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*/
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static int __init eeh_dev_phb_init(void)
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{
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struct pci_controller *phb, *tmp;
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list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
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eeh_dev_phb_init_dynamic(phb);
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return 0;
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}
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core_initcall(eeh_dev_phb_init);
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