bus: add helper to handle sigbus

This patch aims to add a helper to iterate over all buses to find the
relevant bus to handle the sigbus error.

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/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 0943851..62b7318 100644 (file)
--- 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"
 
@@ -242,3 +243,45 @@ rte_bus_get_iommu_class(void)
        }
        return mode;
 }
+
+static int
+bus_handle_sigbus(const struct rte_bus *bus,
+                       const void *failure_addr)
+{
+       int ret;
+
+       if (!bus->sigbus_handler)
+               return -1;
+
+       ret = bus->sigbus_handler(failure_addr);
+
+       /* find bus but handle failed, keep the errno be set. */
+       if (ret < 0 && rte_errno == 0)
+               rte_errno = ENOTSUP;
+
+       return 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);
+       /* can not find bus. */
+       if (!bus)
+               return 1;
+       /* find bus but handle failed, pass on the new errno. */
+       else if (rte_errno != 0)
+               return -1;
+
+       /* 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 4f809a8..a2d1528 100644 (file)
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -304,4 +304,17 @@ int
 rte_devargs_layers_parse(struct rte_devargs *devargs,
                         const char *devstr);
 
+/**
+ * Iterate over 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_ */