[dpdk-dev] [PATCH V4 5/9] bus: add helper to handle sigbus

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

This patch aim to add a helper to iterate all buses to find the
corresponding bus to handle the sigbus error.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
v4->v3:
split patches to be small and clear.
---
 lib/librte_eal/common/eal_common_bus.c | 34 +++++++++++++++++++++++++++++++++-
 lib/librte_eal/common/eal_private.h    | 11 +++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 0943851..34c4f2d 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -37,6 +37,7 @@
 #include <rte_bus.h>
 #include <rte_debug.h>
 #include <rte_string_fns.h>
+#include <rte_errno.h>
 
 #include "eal_private.h"
 
@@ -220,7 +221,6 @@ rte_bus_find_by_device_name(const char *str)
 	return rte_bus_find(NULL, bus_can_parse, name);
 }
 
-
 /*
  * Get iommu class of devices on the bus.
  */
@@ -242,3 +242,35 @@ rte_bus_get_iommu_class(void)
 	}
 	return mode;
 }
+
+static int
+bus_handle_sigbus(const struct rte_bus *bus,
+			const void *failure_addr)
+{
+	return !(bus->sigbus_handler && bus->sigbus_handler(failure_addr) <= 0);
+}
+
+int
+rte_bus_sigbus_handler(const void *failure_addr)
+{
+	struct rte_bus *bus;
+	int old_errno = rte_errno;
+	int ret = 0;
+
+	rte_errno = 0;
+
+	bus = rte_bus_find(NULL, bus_handle_sigbus, failure_addr);
+	if (bus == NULL) {
+		RTE_LOG(ERR, EAL, "No bus can handle the sigbus error!");
+		ret = -1;
+	} else if (rte_errno != 0) {
+		RTE_LOG(ERR, EAL, "Failed to handle the sigbus error!");
+		ret = -1;
+	}
+
+	/* if sigbus not be handled, return back old errno. */
+	if (ret)
+		rte_errno = old_errno;
+
+	return ret;
+}
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index bdadc4d..9517f2b 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -258,4 +258,15 @@ int rte_mp_channel_init(void);
  */
 void dev_callback_process(char *device_name, enum rte_dev_event_type event);
 
+
+/**
+ * Iterate all buses to find the corresponding bus, to handle the sigbus error.
+ * @param failure_addr
+ *	Pointer of the fault address of the sigbus error.
+ *
+ * @return
+ *	 0 on success.
+ *	-1 on error
+ */
+int rte_bus_sigbus_handler(const void *failure_addr);
 #endif /* _EAL_PRIVATE_H_ */
-- 
2.7.4