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powerpc/pci: Introduce pci_remove_device_node_info() 

This implements and exports pci_remove_device_node_info(). It's
used to remove the pdn (struct pci_dn) for the indicated device
node. The function is going to be used by PowerNV PCI hotplug
driver.

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>
This commit is contained in:
Gavin Shan 2016-05-03 15:41:41 +10:00 committed by Michael Ellerman
parent d8f66f411e
commit de5a28ac5a
2 changed files with 24 additions and 0 deletions
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1
arch/powerpc/include/asm/pci-bridge.h
View File

@ -237,6 +237,7 @@ extern struct pci_dn *add_dev_pci_data(struct pci_dev *pdev);
extern void remove_dev_pci_data(struct pci_dev *pdev); extern void remove_dev_pci_data(struct pci_dev *pdev);
extern struct pci_dn *pci_add_device_node_info(struct pci_controller *hose, extern struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
struct device_node *dn); struct device_node *dn);
extern void pci_remove_device_node_info(struct device_node *dn);
static inline int pci_device_from_OF_node(struct device_node *np, static inline int pci_device_from_OF_node(struct device_node *np,
u8 *bus, u8 *devfn) u8 *bus, u8 *devfn)

23
arch/powerpc/kernel/pci_dn.c
View File

@ -331,6 +331,29 @@ struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
} }
EXPORT_SYMBOL_GPL(pci_add_device_node_info); EXPORT_SYMBOL_GPL(pci_add_device_node_info);
void pci_remove_device_node_info(struct device_node *dn)
{
struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL;
#ifdef CONFIG_EEH
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
if (edev)
edev->pdn = NULL;
#endif
if (!pdn)
return;
WARN_ON(!list_empty(&pdn->child_list));
list_del(&pdn->list);
if (pdn->parent)
of_node_put(pdn->parent->node);
dn->data = NULL;
kfree(pdn);
}
EXPORT_SYMBOL_GPL(pci_remove_device_node_info);
/* /*
* Traverse a device tree stopping each PCI device in the tree. * Traverse a device tree stopping each PCI device in the tree.
* This is done depth first. As each node is processed, a "pre" * This is done depth first. As each node is processed, a "pre"