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Commit f8f7d63f authored by Gavin Shan's avatar Gavin Shan Committed by Benjamin Herrenschmidt
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powerpc/eeh: Trace eeh device from I/O cache 



The idea comes from Benjamin Herrenschmidt. The eeh cache helps
fetching the pci device according to the given I/O address. Since
the eeh cache is serving for eeh, it's reasonable for eeh cache
to trace eeh device except pci device.

The patch make eeh cache to trace eeh device. Also, the major
eeh entry function eeh_dn_check_failure has been renamed to
eeh_dev_check_failure since it will take eeh device as input
parameter.

Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent d7bb8862

arch/powerpc/include/asm/eeh.h

+2 −5
Original line number Diff line number Diff line
@@ -196,7 +196,7 @@ int __init eeh_ops_register(struct eeh_ops *ops); 
int __exit eeh_ops_unregister(const char *name);

unsigned long eeh_check_failure(const volatile void __iomem *token,

				unsigned long val);

int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);

int eeh_dev_check_failure(struct eeh_dev *edev);

void __init pci_addr_cache_build(void);

void eeh_add_device_tree_early(struct device_node *);

void eeh_add_device_tree_late(struct pci_bus *);
@@ -231,10 +231,7 @@ static inline unsigned long eeh_check_failure(const volatile void __iomem *token 
	return val;

}



static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)

{

	return 0;

}

#define eeh_dev_check_failure(x) (0)



static inline void pci_addr_cache_build(void) { }

arch/powerpc/include/asm/pci-bridge.h

+2 −0
Original line number Diff line number Diff line
@@ -184,6 +184,8 @@ static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn) 
{

	return PCI_DN(dn)->edev;

}

#else

#define of_node_to_eeh_dev(x) (NULL)

#endif



/** Find the bus corresponding to the indicated device node */

arch/powerpc/include/asm/ppc-pci.h

+1 −1
Original line number Diff line number Diff line
@@ -50,7 +50,7 @@ extern int rtas_setup_phb(struct pci_controller *phb); 
void pci_addr_cache_build(void);

void pci_addr_cache_insert_device(struct pci_dev *dev);

void pci_addr_cache_remove_device(struct pci_dev *dev);

struct pci_dev *pci_addr_cache_get_device(unsigned long addr);

struct eeh_dev *pci_addr_cache_get_device(unsigned long addr);

void eeh_slot_error_detail(struct eeh_pe *pe, int severity);

int eeh_pci_enable(struct eeh_pe *pe, int function);

int eeh_reset_pe(struct eeh_pe *);

arch/powerpc/kernel/rtas_pci.c

+1 −1
Original line number Diff line number Diff line
@@ -81,7 +81,7 @@ int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val) 
		return PCIBIOS_DEVICE_NOT_FOUND;



	if (returnval == EEH_IO_ERROR_VALUE(size) &&

	    eeh_dn_check_failure (pdn->node, NULL))

	    eeh_dev_check_failure(of_node_to_eeh_dev(pdn->node)))

		return PCIBIOS_DEVICE_NOT_FOUND;



	return PCIBIOS_SUCCESSFUL;

arch/powerpc/platforms/pseries/eeh.c

+14 −19
Original line number Diff line number Diff line
@@ -270,9 +270,8 @@ static inline unsigned long eeh_token_to_phys(unsigned long token) 
}



/**

 * eeh_dn_check_failure - Check if all 1's data is due to EEH slot freeze

 * @dn: device node

 * @dev: pci device, if known

 * eeh_dev_check_failure - Check if all 1's data is due to EEH slot freeze

 * @edev: eeh device

 *

 * Check for an EEH failure for the given device node.  Call this

 * routine if the result of a read was all 0xff's and you want to
@@ -284,12 +283,13 @@ static inline unsigned long eeh_token_to_phys(unsigned long token) 
 *

 * It is safe to call this routine in an interrupt context.

 */

int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)

int eeh_dev_check_failure(struct eeh_dev *edev)

{

	int ret;

	unsigned long flags;

	struct device_node *dn;

	struct pci_dev *dev;

	struct eeh_pe *pe;

	struct eeh_dev *edev;

	int rc = 0;

	const char *location;
@@ -298,15 +298,12 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) 
	if (!eeh_subsystem_enabled)

		return 0;



	if (dn) {

		edev = of_node_to_eeh_dev(dn);

	} else if (dev) {

		edev = pci_dev_to_eeh_dev(dev);

		dn = pci_device_to_OF_node(dev);

	} else {

	if (!edev) {

		eeh_stats.no_dn++;

		return 0;

	}

	dn = eeh_dev_to_of_node(edev);

	dev = eeh_dev_to_pci_dev(edev);

	pe = edev->pe;



	/* Access to IO BARs might get this far and still not want checking. */
@@ -393,7 +390,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) 
	return rc;

}



EXPORT_SYMBOL_GPL(eeh_dn_check_failure);

EXPORT_SYMBOL_GPL(eeh_dev_check_failure);



/**

 * eeh_check_failure - Check if all 1's data is due to EEH slot freeze
@@ -410,21 +407,19 @@ EXPORT_SYMBOL_GPL(eeh_dn_check_failure); 
unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)

{

	unsigned long addr;

	struct pci_dev *dev;

	struct device_node *dn;

	struct eeh_dev *edev;



	/* Finding the phys addr + pci device; this is pretty quick. */

	addr = eeh_token_to_phys((unsigned long __force) token);

	dev = pci_addr_cache_get_device(addr);

	if (!dev) {

	edev = pci_addr_cache_get_device(addr);

	if (!edev) {

		eeh_stats.no_device++;

		return val;

	}



	dn = pci_device_to_OF_node(dev);

	eeh_dn_check_failure(dn, dev);

	eeh_dev_check_failure(edev);



	pci_dev_put(dev);

	pci_dev_put(eeh_dev_to_pci_dev(edev));

	return val;

}