[PATCH v6 3/7] bus: add sigbus handler

[Jeff Guo <jia.guo@intel.com>]

When device be hotplug out, if data path still read/write device, the
sigbus error will occur, this error need to be handled. So a handler
need to be here to capture the signal and handle it correspondingly.

This patch introduces a bus ops to handle sigbus error, it is a bus
specific behavior, so that each kind of bus can implement its own logic
case by case.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
Acked-by: Shaopeng He <shaopeng.he@intel.com>
---
v6->v5:
refine some description of bus ops
---
 lib/librte_eal/common/include/rte_bus.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index e3a55a8..216ad1e 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -182,6 +182,21 @@ typedef int (*rte_bus_parse_t)(const char *name, void *addr);
 typedef int (*rte_bus_hotplug_failure_handler_t)(struct rte_device *dev);
 
 /**
+ * Implementation a specific sigbus handler, which is responsible for handle
+ * the sigbus error which is either original memory error, or specific memory
+ * error that caused of hot unplug. When sigbus error be captured, it could
+ * call this function to handle sigbus error.
+ * @param failure_addr
+ *	Pointer of the fault address of the sigbus error.
+ *
+ * @return
+ *	0 for success handle the sigbus.
+ *	1 for no bus handle the sigbus.
+ *	-1 for failed to handle the sigbus
+ */
+typedef int (*rte_bus_sigbus_handler_t)(const void *failure_addr);
+
+/**
  * Bus scan policies
  */
 enum rte_bus_scan_mode {
@@ -227,6 +242,8 @@ struct rte_bus {
 	rte_bus_get_iommu_class_t get_iommu_class; /**< Get iommu class */
 	rte_bus_hotplug_failure_handler_t hotplug_failure_handler;
 					/**< handle hotplug failure on bus */
+	rte_bus_sigbus_handler_t sigbus_handler; /**< handle sigbus error */
+
 };
 
 /**
-- 
2.7.4