Auto-detect missing hw support for crc32c and fallback to software

[fio.git] / crc / crc32c-intel.c

diff --git a/crc/crc32c-intel.c b/crc/crc32c-intel.c
index cec5ad5dec9d5d88ec7498133f2915ae0c1bd146..fc106fa5a9755348e97b5e7dd631267b911061f0 100644 (file)
--- a/crc/crc32c-intel.c
+++ b/crc/crc32c-intel.c
@@ -1,4 +1,10 @@
 #include <inttypes.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 #include "crc32c.h"
 
 /*
@@ -68,5 +74,37 @@ uint32_t crc32c_intel(unsigned char const *data, unsigned long length)
        return crc;
 }
 
-#endif /* ARCH_HAVE_SSE */
+static void sig_ill(int sig)
+{
+}
+
+static void crc32c_test(void)
+{
+       unsigned char buf[4] = { 1, 2, 3, 4 };
+       struct sigaction act;
+
+       /*
+        * Check if hw accelerated crc32c is available
+        */
+       memset(&act, 0, sizeof(act));
+       act.sa_handler = sig_ill;
+       act.sa_flags = SA_RESETHAND;
+       sigaction(SIGILL, &act, NULL);
+
+       (void) crc32c_intel(buf, sizeof(buf));
+}
+
+int crc32c_intel_works(void)
+{
+       if (!fork()) {
+               crc32c_test();
+               exit(0);
+       } else {
+               int status;
 
+               wait(&status);
+               return !WIFSIGNALED(status);
+       }
+}
+
+#endif /* ARCH_HAVE_SSE */