[dpdk-dev] [PATCH V5 5/7] bus: add helper to handle sigbus

[Jeff Guo]

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....@intel.com>
---
v5->v4:
refine the errno restore logic
---
 lib/librte_eal/common/eal_common_bus.c | 36 +++++++++++++++++++++++++++++++++-
 lib/librte_eal/common/eal_private.h    | 12 ++++++++++++
 2 files changed, 47 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..c9f3566 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 +242,37 @@ rte_bus_get_iommu_class(void)
        }
        return mode;
 }
+
+static int
+bus_handle_sigbus(const struct rte_bus *bus,
+                       const void *failure_addr)
+{
+       int ret;
+
+       ret = bus->sigbus_handler(failure_addr);
+       rte_errno = ret;
+
+       return !(bus->sigbus_handler && ret <= 0);
+}
+
+int
+rte_bus_sigbus_handler(const void *failure_addr)
+{
+       struct rte_bus *bus;
+
+       int ret = 0;
+       int old_errno = rte_errno;
+       rte_errno = 0;
+
+       bus = rte_bus_find(NULL, bus_handle_sigbus, failure_addr);
+       /* failed to handle the sigbus, pass the new errno. */
+       if (bus && rte_errno == -1)
+               return -1;
+       else if (!bus)
+               ret = 1;
+
+       /* otherwise restore the old errno. */
+       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..a91c4b5 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -258,4 +258,16 @@ 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 success to handle the sigbus.
+ *     -1 failed to handle the sigbus
+ *      1 no bus can handler the sigbus
+ */
+int rte_bus_sigbus_handler(const void *failure_addr);
 #endif /* _EAL_PRIVATE_H_ */
-- 
2.7.4