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PCI/powerpc: support PCIe fundamental reset 

By default, the EEH framework on powerpc does what's known as a "hot
reset" during recovery of a PCI Express device.  We've found a case
where the device needs a "fundamental reset" to recover properly.  The
current PCI error recovery and EEH frameworks do not support this
distinction.

The attached patch makes changes to EEH to utilize the new bit field.

Signed-off-by: Mike Mason <mmlnx@us.ibm.com>
Signed-off-by: Richard Lary <rlary@us.ibm.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Mike Mason 2009-07-30 15:42:39 -07:00 committed by Jesse Barnes
parent fe14acd4e7
commit 6e19314cc9
2 changed files with 10 additions and 1 deletions
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1
arch/powerpc/kernel/pci_64.c
View File

@ -143,6 +143,7 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
dev->dev.bus = &pci_bus_type;
dev->devfn = devfn;
dev->multifunction = 0; /* maybe a lie? */
dev->needs_freset = 0; /* pcie fundamental reset required */
dev->vendor = get_int_prop(node, "vendor-id", 0xffff);
dev->device = get_int_prop(node, "device-id", 0xffff);

10
arch/powerpc/platforms/pseries/eeh.c
View File

@ -744,7 +744,15 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
static void __rtas_set_slot_reset(struct pci_dn *pdn)
{
rtas_pci_slot_reset (pdn, 1);
struct pci_dev *dev = pdn->pcidev;
/* Determine type of EEH reset required by device,
* default hot reset or fundamental reset
*/
if (dev->needs_freset)
rtas_pci_slot_reset(pdn, 3);
else
rtas_pci_slot_reset(pdn, 1);
/* The PCI bus requires that the reset be held high for at least
* a 100 milliseconds. We wait a bit longer 'just in case'. */