bus: add sigbus handler

When a device is hot-unplugged, a sigbus error will occur of the datapath
can still read/write to the device. A handler is required here to capture
the sigbus signal and handle it appropriately.

This patch introduces a bus ops to handle sigbus errors. Each bus can
implement its own case-dependent logic to handle the sigbus errors.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
Acked-by: Shaopeng He <shaopeng.he@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 1bb53dc..6be4b5c 100644 (file)
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -181,6 +181,21 @@ typedef int (*rte_bus_parse_t)(const char *name, void *addr);
  */
 typedef int (*rte_bus_hot_unplug_handler_t)(struct rte_device *dev);
 
+/**
+ * Implement a specific sigbus handler, which is responsible for handling
+ * the sigbus error which is either original memory error, or specific memory
+ * error that caused of device be hot-unplugged. 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 for hot-unplug.
+ *     1 for not process it, because it is a generic sigbus error.
+ *     -1 for failed to handle the sigbus for hot-unplug.
+ */
+typedef int (*rte_bus_sigbus_handler_t)(const void *failure_addr);
+
 /**
  * Bus scan policies
  */
@@ -228,6 +243,9 @@ struct rte_bus {
        rte_dev_iterate_t dev_iterate; /**< Device iterator. */
        rte_bus_hot_unplug_handler_t hot_unplug_handler;
                                /**< handle hot-unplug failure on the bus */
+       rte_bus_sigbus_handler_t sigbus_handler;
+                                       /**< handle sigbus error on the bus */
+
 };
 
 /**