[dpdk-dev] [PATCH V5 1/7] bus: add hotplug failure handler

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

When device be hotplug out, if app still continue to access device by mmio,
it will cause of memory failure and result the system crash.

This patch introduces a bus ops to handle device hotplug failure, 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>
---
v5->v4:
change ops name to be more clear
refine doc and commit log
---
 lib/librte_eal/common/include/rte_bus.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index eb9eded..8a993cf 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -168,6 +168,19 @@ typedef int (*rte_bus_unplug_t)(struct rte_device *dev);
 typedef int (*rte_bus_parse_t)(const char *name, void *addr);
 
 /**
+ * Implementation a specific hotplug failure handler, which is responsible
+ * for handle the failure when hot remove the device, guaranty the system
+ * would not crash in the case.
+ * @param dev
+ *	Pointer of the device structure.
+ *
+ * @return
+ *	0 on success.
+ *	!0 on error.
+ */
+typedef int (*rte_bus_hotplug_failure_handler_t)(struct rte_device *dev);
+
+/**
  * Bus scan policies
  */
 enum rte_bus_scan_mode {
@@ -211,6 +224,8 @@ struct rte_bus {
 	rte_bus_parse_t parse;       /**< Parse a device name */
 	struct rte_bus_conf conf;    /**< Bus configuration */
 	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 */
 };
 
 /**
-- 
2.7.4