[PATCH v4 2/9] pci: Add hotplug_slot_ops.reset_slot()

From: Alex Williamson
Date: Mon Aug 05 2013 - 15:39:52 EST

This optional callback allows htoplug controllers to perform slot
specific resets. These may be necessary in cases where a normal
secondary bus reset can interact with controller logic and expose
spurious hotplugs.

Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
include/linux/pci_hotplug.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index 8db71dc..bd32109 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -63,6 +63,9 @@ enum pcie_link_width {
* @get_adapter_status: Called to get see if an adapter is present in the slot or not.
* If this field is NULL, the value passed in the struct hotplug_slot_info
* will be used when this value is requested by a user.
+ * @reset_slot: Optional interface to allow override of a bus reset for the
+ * slot for cases where a secondary bus reset can result in spurious
+ * hotplug events or where a slot can be reset independent of the bus.
* The table of function pointers that is passed to the hotplug pci core by a
* hotplug pci driver. These functions are called by the hotplug pci core when
@@ -80,6 +83,7 @@ struct hotplug_slot_ops {
int (*get_attention_status) (struct hotplug_slot *slot, u8 *value);
int (*get_latch_status) (struct hotplug_slot *slot, u8 *value);
int (*get_adapter_status) (struct hotplug_slot *slot, u8 *value);
+ int (*reset_slot) (struct hotplug_slot *slot, int probe);


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