From: Jeff Guo <jia.guo@intel.com>
Date: Mon, 15 Oct 2018 11:27:25 +0000 (+0800)
Subject: bus: add helper to handle sigbus
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=62e63653baf5fb20315c887bb3d21bebd0259e73;p=dpdk.git

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 0943851ccd..62b731869a 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"
 
@@ -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 4f809a83c2..a2d1528c05 100644
--- 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_ */