Merge tag 'powerpc-4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...

[linux-drm-fsl-dcu.git] / tools / testing / selftests / powerpc / tm / tm-vmxcopy.c

diff --git a/tools/testing/selftests/powerpc/tm/tm-vmxcopy.c b/tools/testing/selftests/powerpc/tm/tm-vmxcopy.c
new file mode 100644 (file)
index 0000000..0274de7
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-vmxcopy.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2015, Michael Neuling, IBM Corp.
+ * Licensed under GPLv2.
+ *
+ * Original: Michael Neuling 4/12/2013
+ * Edited: Rashmica Gupta 4/12/2015
+ *
+ * See if the altivec state is leaked out of an aborted transaction due to
+ * kernel vmx copy loops.
+ *
+ * When the transaction aborts, VSR values should rollback to the values
+ * they held before the transaction commenced. Using VSRs while transaction
+ * is suspended should not affect the checkpointed values.
+ *
+ * (1) write A to a VSR
+ * (2) start transaction
+ * (3) suspend transaction
+ * (4) change the VSR to B
+ * (5) trigger kernel vmx copy loop
+ * (6) abort transaction
+ * (7) check that the VSR value is A
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <assert.h>
+
+#include "tm.h"
+#include "utils.h"
+
+int test_vmxcopy()
+{
+       long double vecin = 1.3;
+       long double vecout;
+       unsigned long pgsize = getpagesize();
+       int i;
+       int fd;
+       int size = pgsize*16;
+       char tmpfile[] = "/tmp/page_faultXXXXXX";
+       char buf[pgsize];
+       char *a;
+       uint64_t aborted = 0;
+
+       SKIP_IF(!have_htm());
+
+       fd = mkstemp(tmpfile);
+       assert(fd >= 0);
+
+       memset(buf, 0, pgsize);
+       for (i = 0; i < size; i += pgsize)
+               assert(write(fd, buf, pgsize) == pgsize);
+
+       unlink(tmpfile);
+
+       a = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+       assert(a != MAP_FAILED);
+
+       asm __volatile__(
+               "lxvd2x 40,0,%[vecinptr];"      /* set 40 to initial value*/
+               "tbegin.;"
+               "beq    3f;"
+               "tsuspend.;"
+               "xxlxor 40,40,40;"              /* set 40 to 0 */
+               "std    5, 0(%[map]);"          /* cause kernel vmx copy page */
+               "tabort. 0;"
+               "tresume.;"
+               "tend.;"
+               "li     %[res], 0;"
+               "b      5f;"
+
+               /* Abort handler */
+               "3:;"
+               "li     %[res], 1;"
+
+               "5:;"
+               "stxvd2x 40,0,%[vecoutptr];"
+               : [res]"=r"(aborted)
+               : [vecinptr]"r"(&vecin),
+                 [vecoutptr]"r"(&vecout),
+                 [map]"r"(a)
+               : "memory", "r0", "r3", "r4", "r5", "r6", "r7");
+
+       if (aborted && (vecin != vecout)){
+               printf("FAILED: vector state leaked on abort %f != %f\n",
+                      (double)vecin, (double)vecout);
+               return 1;
+       }
+
+       munmap(a, size);
+
+       close(fd);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(test_vmxcopy, "tm_vmxcopy");
+}