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Commit 3409eb4e authored by Gavin Shan's avatar Gavin Shan Committed by Michael Ellerman
Browse files

powerpc/pseries: Drop config requests in EEH accessors 



The pSeires EEH config accessors rely on rtas_{read, write}_config()
and the condition to check if the PE's config space is blocked
should be moved to those 2 functions so that config requests from
kernel, userland, EEH core can be dropped to avoid recursive EEH error
if necessary.

Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent d2cfbcd7

arch/powerpc/kernel/rtas_pci.c

+11 −19
Original line number Diff line number Diff line
@@ -66,6 +66,11 @@ int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val) 
		return PCIBIOS_DEVICE_NOT_FOUND;

	if (!config_access_valid(pdn, where))

		return PCIBIOS_BAD_REGISTER_NUMBER;

#ifdef CONFIG_EEH

	if (pdn->edev && pdn->edev->pe &&

	    (pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))

		return PCIBIOS_SET_FAILED;

#endif



	addr = rtas_config_addr(pdn->busno, pdn->devfn, where);

	buid = pdn->phb->buid;
@@ -90,9 +95,6 @@ static int rtas_pci_read_config(struct pci_bus *bus, 
	struct device_node *busdn, *dn;

	struct pci_dn *pdn;

	bool found = false;

#ifdef CONFIG_EEH

	struct eeh_dev *edev;

#endif

	int ret;



	/* Search only direct children of the bus */
@@ -109,11 +111,6 @@ static int rtas_pci_read_config(struct pci_bus *bus, 


	if (!found)

		return PCIBIOS_DEVICE_NOT_FOUND;

#ifdef CONFIG_EEH

	edev = of_node_to_eeh_dev(dn);

	if (edev && edev->pe && edev->pe->state & EEH_PE_CFG_BLOCKED)

		return PCIBIOS_DEVICE_NOT_FOUND;

#endif



	ret = rtas_read_config(pdn, where, size, val);

	if (*val == EEH_IO_ERROR_VALUE(size) &&
@@ -132,6 +129,11 @@ int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val) 
		return PCIBIOS_DEVICE_NOT_FOUND;

	if (!config_access_valid(pdn, where))

		return PCIBIOS_BAD_REGISTER_NUMBER;

#ifdef CONFIG_EEH

	if (pdn->edev && pdn->edev->pe &&

	    (pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))

		return PCIBIOS_SET_FAILED;

#endif



	addr = rtas_config_addr(pdn->busno, pdn->devfn, where);

	buid = pdn->phb->buid;
@@ -155,10 +157,6 @@ static int rtas_pci_write_config(struct pci_bus *bus, 
	struct device_node *busdn, *dn;

	struct pci_dn *pdn;

	bool found = false;

#ifdef CONFIG_EEH

	struct eeh_dev *edev;

#endif

	int ret;



	/* Search only direct children of the bus */

	busdn = pci_bus_to_OF_node(bus);
@@ -173,14 +171,8 @@ static int rtas_pci_write_config(struct pci_bus *bus, 


	if (!found)

		return PCIBIOS_DEVICE_NOT_FOUND;

#ifdef CONFIG_EEH

	edev = of_node_to_eeh_dev(dn);

	if (edev && edev->pe && (edev->pe->state & EEH_PE_CFG_BLOCKED))

		return PCIBIOS_DEVICE_NOT_FOUND;

#endif

	ret = rtas_write_config(pdn, where, size, val);



	return ret;

	return rtas_write_config(pdn, where, size, val);

}



static struct pci_ops rtas_pci_ops = {