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Commit 82e8882f authored by Gavin Shan's avatar Gavin Shan Committed by Benjamin Herrenschmidt
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powerpc/eeh: Remove PE at appropriate time 



During PCI hotplug and EEH recovery, the PE hierarchy tree might be
changed due to the PCI topology changes. At later point when the
PCI device is added, the PE will be created dynamically again.

The patch introduces new function to remove EEH devices from the
associated PE. That also can cause that the parent PE is removed
from the PE tree if the parent PE doesn't include valid EEH devices
and child PEs.

Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 9b84348c

arch/powerpc/include/asm/eeh.h

+1 −0
Original line number Diff line number Diff line
@@ -167,6 +167,7 @@ static inline void eeh_unlock(void) 
typedef void *(*eeh_traverse_func)(void *data, void *flag);

int __devinit eeh_phb_pe_create(struct pci_controller *phb);

int eeh_add_to_parent_pe(struct eeh_dev *edev);

int eeh_rmv_from_parent_pe(struct eeh_dev *edev);



void * __devinit eeh_dev_init(struct device_node *dn, void *data);

void __devinit eeh_dev_phb_init_dynamic(struct pci_controller *phb);

arch/powerpc/platforms/pseries/eeh.c

+1 −0
Original line number Diff line number Diff line
@@ -1156,6 +1156,7 @@ static void eeh_remove_device(struct pci_dev *dev) 
	dev->dev.archdata.edev = NULL;

	pci_dev_put(dev);



	eeh_rmv_from_parent_pe(edev);

	pci_addr_cache_remove_device(dev);

	eeh_sysfs_remove_device(dev);

}

arch/powerpc/platforms/pseries/eeh_pe.c

+47 −0
Original line number Diff line number Diff line
@@ -341,3 +341,50 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev) 


	return 0;

}



/**

 * eeh_rmv_from_parent_pe - Remove one EEH device from the associated PE

 * @edev: EEH device

 *

 * The PE hierarchy tree might be changed when doing PCI hotplug.

 * Also, the PCI devices or buses could be removed from the system

 * during EEH recovery. So we have to call the function remove the

 * corresponding PE accordingly if necessary.

 */

int eeh_rmv_from_parent_pe(struct eeh_dev *edev)

{

	struct eeh_pe *pe, *parent;



	if (!edev->pe) {

		pr_warning("%s: No PE found for EEH device %s\n",

			__func__, edev->dn->full_name);

		return -EEXIST;

	}



	/* Remove the EEH device */

	pe = edev->pe;

	edev->pe = NULL;

	list_del(&edev->list);



	/*

	 * Check if the parent PE includes any EEH devices.

	 * If not, we should delete that. Also, we should

	 * delete the parent PE if it doesn't have associated

	 * child PEs and EEH devices.

	 */

	while (1) {

		parent = pe->parent;

		if (pe->type == EEH_PE_PHB)

			break;



		if (list_empty(&pe->edevs) &&

		    list_empty(&pe->child_list)) {

			list_del(&pe->child);

			kfree(pe);

		}



		pe = parent;

	}



	return 0;

}