Commit 308fc4f8 authored by Richard A Lary's avatar Richard A Lary Committed by Benjamin Herrenschmidt
Browse files

powerpc/pseries/eeh: Propagate needs_freset flag to device at PE 



  For multifunction adapters with a PCI bridge or switch as the device
  at the Partitionable Endpoint(PE), if one or more devices below PE
  sets dev->needs_freset, that value will be set for the PE device.

  In other words, if any device below PE requires a fundamental reset
  the PE will request a fundamental reset.

Signed-off-by: default avatarRichard A Lary <rlary@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 9ee820fa

arch/powerpc/platforms/pseries/eeh.c

+43 −7
Original line number Diff line number Diff line
@@ -451,6 +451,39 @@ void eeh_clear_slot (struct device_node *dn, int mode_flag) 
	raw_spin_unlock_irqrestore(&confirm_error_lock, flags);

}



void __eeh_set_pe_freset(struct device_node *parent, unsigned int *freset)

{

	struct device_node *dn;



	for_each_child_of_node(parent, dn) {

		if (PCI_DN(dn)) {



			struct pci_dev *dev = PCI_DN(dn)->pcidev;



			if (dev && dev->driver)

				*freset |= dev->needs_freset;



			__eeh_set_pe_freset(dn, freset);

		}

	}

}



void eeh_set_pe_freset(struct device_node *dn, unsigned int *freset)

{

	struct pci_dev *dev;

	dn = find_device_pe(dn);



	/* Back up one, since config addrs might be shared */

	if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))

		dn = dn->parent;



	dev = PCI_DN(dn)->pcidev;

	if (dev)

		*freset |= dev->needs_freset;



	__eeh_set_pe_freset(dn, freset);

}



/**

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

 * @dn device node
@@ -739,18 +772,21 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat 
/**

 * rtas_set_slot_reset -- assert the pci #RST line for 1/4 second

 * @pdn: pci device node to be reset.

 *

 *  Return 0 if success, else a non-zero value.

 */



static void __rtas_set_slot_reset(struct pci_dn *pdn)

{

	struct pci_dev *dev = pdn->pcidev;

	unsigned int freset = 0;



	/* Determine type of EEH reset required by device,

	 * default hot reset or fundamental reset

	/* Determine type of EEH reset required for

	 * Partitionable Endpoint, a hot-reset (1)

	 * or a fundamental reset (3).

	 * A fundamental reset required by any device under

	 * Partitionable Endpoint trumps hot-reset.

  	 */

	if (dev && dev->needs_freset)

	eeh_set_pe_freset(pdn->node, &freset);



	if (freset)

		rtas_pci_slot_reset(pdn, 3);

	else

		rtas_pci_slot_reset(pdn, 1);

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